Rozprawy doktorskie: „Mandibular prosthesis”

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Carver, Keith Charles. "The in vivo antibacterial efficacy of ultrasound after hand and rotary instrumentation in human mandibular molars." Connect to resource, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1186689182.

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Arvier, J. F. "Biocompatability of the Bosker Transmandibular Implant : components of the system in a short-term animal trial /." Title page, contents and precis only, 1987. http://web4.library.adelaide.edu.au/theses/09DM/09dma795.pdf.

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Gregolin, Rafael Ferreira [UNESP]. "Desenvolvimento, comportamento mecânico e microestrutural de uma prótese mandibular em liga de titânio produzida por sinterização direta a laser de metal (DMLS)." Universidade Estadual Paulista (UNESP), 2013. http://hdl.handle.net/11449/94477.

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Made available in DSpace on 2014-06-11T19:27:13Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-03-20Bitstream added on 2014-06-13T20:35:19Z : No. of bitstreams: 1 gregolin_rf_me_ilha.pdf: 3746269 bytes, checksum: b2a1686375b3a28a8709c13b5b75a4bd (MD5) A prototipagem rápida está sendo utilizada em diversas áreas do conhecimento humano para auxiliar no estudo e muitas vezes na própria fabricação do componente usual. Atualmente, com o avanço de softwares, pode-se criar com facilidade imagens tridimensionais, ou mesmo, capturar essas imagens de equipamentos como a tomografia computadorizada e a ressonância magnética. Consegue-se reproduzir qualquer parte do corpo humano com grande perfeição e isso é utilizado na fabricação de implantes, scaffolds (arcabouços – engenharia de tecidos), materiais de auxílio e preparação em cirurgias (biomodelos). Os principais materiais utilizados na fabricação de implantes hoje são: o titânio puro, as ligas de titânio, o aço inoxidável, o polietileno, o PMMA, as ligas de cobalto-cromo e as cerâmicas. Este trabalho se propõe a fazer: um estudo mecânico e microestrutural da liga Ti-6Al-4V obtida por prototipagem rápida no processo de sinterização direta a laser de metais (DMLS) e compará-la com a liga Ti-6Al-4V produzida por processos convencionais de conformação (trefilação). Além disso, pretende realizar o desenvolvimento de uma placa condilar personalizada utilizada para patologias de distúrbios de ATM (articulação têmporo-mandibular), avaliando sua geometria pelo software ANSYS®, com o apoio da tomografia computadoriza e do software de construção de imagens tridimensionais INVESALIUS® Rapid prototyping is being used in various areas of human knowledge to assist in the study and often in the usual component manufacturing. Today, with the advancement of software, you can easily create three-dimensional images, or even, capture these images of equipment such as computed tomography and magnetic resonance imaging. You able to reproduce any part of the human body with great perfection and it’s used in the manufacture of implants, scaffolds (tissue engineering), material aid and preparation for surgery (biomodels). The main materials used in the manufacture of implants today are: pure titanium, titanium alloys, stainless steel, polyethylene, PMMA, the cobalt-chromium alloys and ceramics. This paper proposes to do: mechanical and microstructural studies of alloy Ti-6Al-4V obtained by rapid prototyping process in direct metal laser sintering (DMLS) and compare it with the Ti-6Al-4V alloy produced by conventional forming process (wiredrawing). Also, make the development of a custom condylar plate used for diseases of TMJ (temporomandibular joint) disorders, assessing its geometry by ANSYS® software with the help of computerized tomography and the software to build three-dimensional images INVESALIUS®

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Gregolin, Rafael Ferreira. "Desenvolvimento, comportamento mecânico e microestrutural de uma prótese mandibular em liga de titânio produzida por sinterização direta a laser de metal (DMLS) /." Ilha Solteira, 2013. http://hdl.handle.net/11449/94477.

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Orientador: Ruis Camargo Tokimatsu Banca: João Antonio Pereira Banca: Cecilia Amelia de Carvalho Zavaglia Resumo: A prototipagem rápida está sendo utilizada em diversas áreas do conhecimento humano para auxiliar no estudo e muitas vezes na própria fabricação do componente usual. Atualmente, com o avanço de softwares, pode-se criar com facilidade imagens tridimensionais, ou mesmo, capturar essas imagens de equipamentos como a tomografia computadorizada e a ressonância magnética. Consegue-se reproduzir qualquer parte do corpo humano com grande perfeição e isso é utilizado na fabricação de implantes, scaffolds (arcabouços - engenharia de tecidos), materiais de auxílio e preparação em cirurgias (biomodelos). Os principais materiais utilizados na fabricação de implantes hoje são: o titânio puro, as ligas de titânio, o aço inoxidável, o polietileno, o PMMA, as ligas de cobalto-cromo e as cerâmicas. Este trabalho se propõe a fazer: um estudo mecânico e microestrutural da liga Ti-6Al-4V obtida por prototipagem rápida no processo de sinterização direta a laser de metais (DMLS) e compará-la com a liga Ti-6Al-4V produzida por processos convencionais de conformação (trefilação). Além disso, pretende realizar o desenvolvimento de uma placa condilar personalizada utilizada para patologias de distúrbios de ATM (articulação têmporo-mandibular), avaliando sua geometria pelo software ANSYS®, com o apoio da tomografia computadoriza e do software de construção de imagens tridimensionais INVESALIUS® Abstract: Rapid prototyping is being used in various areas of human knowledge to assist in the study and often in the usual component manufacturing. Today, with the advancement of software, you can easily create three-dimensional images, or even, capture these images of equipment such as computed tomography and magnetic resonance imaging. You able to reproduce any part of the human body with great perfection and it's used in the manufacture of implants, scaffolds (tissue engineering), material aid and preparation for surgery (biomodels). The main materials used in the manufacture of implants today are: pure titanium, titanium alloys, stainless steel, polyethylene, PMMA, the cobalt-chromium alloys and ceramics. This paper proposes to do: mechanical and microstructural studies of alloy Ti-6Al-4V obtained by rapid prototyping process in direct metal laser sintering (DMLS) and compare it with the Ti-6Al-4V alloy produced by conventional forming process (wiredrawing). Also, make the development of a custom condylar plate used for diseases of TMJ (temporomandibular joint) disorders, assessing its geometry by ANSYS® software with the help of computerized tomography and the software to build three-dimensional images INVESALIUS® Mestre

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Medeiros, Rodrigo Antonio de [UNESP]. "Análise da distribuição das tensões em próteses protocolo mandibulares com estruturas fresadas por CAD/CAM e confeccionadas pela técnica convencional: análise pela fotoelasticidade e extensometria." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/148570.

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Submitted by RODRIGO ANTÔNIO DE MEDEIROS null (rodrigomedeiros88@hotmail.com) on 2017-01-17T18:59:53Z No. of bitstreams: 1 Tese_Rodrigo Medeiros.docx: 4055404 bytes, checksum: 8420d48d6379115c0945c7b9f391bbc6 (MD5) Rejected by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br), reason: Solicitamos que realize uma nova submissão seguindo as orientações abaixo: Incluir o número do processo de financiamento nos agradecimentos da dissertação/tese. A versão final da dissertação/tese deve ser submetida no formato PDF (Portable Document Format). O arquivo PDF não deve estar protegido e a dissertação/tese deve estar em um único arquivo, inclusive os apêndices e anexos, se houver. Por favor, estas informações e realize uma nova submissão. Agradecemos a compreensão. on 2017-01-20T15:26:30Z (GMT) Submitted by RODRIGO ANTÔNIO DE MEDEIROS null (rodrigomedeiros88@hotmail.com) on 2017-01-20T21:34:08Z No. of bitstreams: 1 Tese_Rodrigo Medeiros.pdf: 2572700 bytes, checksum: 14ceeb89edad876baa95811c229c59dd (MD5) Approved for entry into archive by LUIZA DE MENEZES ROMANETTO (luizamenezes@reitoria.unesp.br) on 2017-01-23T19:00:09Z (GMT) No. of bitstreams: 1 medeiros_ra_dr_araca.pdf: 2572700 bytes, checksum: 14ceeb89edad876baa95811c229c59dd (MD5) Made available in DSpace on 2017-01-23T19:00:09Z (GMT). No. of bitstreams: 1 medeiros_ra_dr_araca.pdf: 2572700 bytes, checksum: 14ceeb89edad876baa95811c229c59dd (MD5) Previous issue date: 2016-12-12 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) O objetivo desse estudo foi avaliar a distribuição de tensão, por meio dos métodos fotoelástico e extensometria, em próteses protocolo mandibulares (tipo Branemärk) com infraestruturas confeccionadas com diferentes materiais e técnicas, sob força de compressão. Foi confeccionado um modelo fotoelástico de uma mandíbula edêntula que recebeu cinco implantes 4x11 mm hexágono externo entre os forames mentonianos. Os grupos foram divididos em: Grupo I - infraestrutura fundida em níquel-cromo com revestimento oclusal em resina acrílica (n=7); Grupo II - infraestrutura fundida em níquel-cromo com revestimento oclusal em cerâmica (n=7); Grupo III - infraestrutura fresada em Zircônia estabilizada por óxido de ítrio com revestimento em cerâmica (n=7). Inicialmente, foi realizado o teste da fotoelasticidade e, posteriormente, a extensometria. Pela metodologia da fotoelasticidade, com auxílio de uma máquina de ensaio universal (EMIC) foram aplicadas cargas axiais de 70 N na região do implante mais anterior, entre os incisivos, e no centro do primeiro molar de cada lado. Por meio de imagens fotográficas e com o auxílio do programa Adobe Photoshop CS6, as imagens foram analisadas de acordo com o número de franjas de alta intensidade nos grupos testados. Para a metodologia da extensometria, as cargas foram aplicadas da mesma maneira da metodologia da fotoelasticidade e a medição das tensões foi realizada em duas regiões distintas. Para a primeira região, dois extensômetros elétricos de resistência foram posicionados horizontalmente na região mesial e distal dos cinco implantes, diretamente sobre a crista marginal do modelo fotoelástico. Para a segunda região, a resina fotoelástica foi removida da superfície vestibular e lingual de cada implante, sendo mantida1 mm de resina intacta, onde os extensômetros foram fixados verticalmente. Foram realizados os mesmos testes de compressão descritos anteriormente. Os valores de tensão registrados foram agrupados em tabelas e submetidas à análise de variância (ANOVA) dois fatores e ao teste de Tukey com significância de 5%. Os resultados das duas metodologias demonstraram menores valores de tensão para o Grupo I, quando comparado aos demais grupos. É possível concluir que as próteses protocolo com infraestrutura fundida em metal e revestimento oclusal acrílico demonstraram melhores resultados biomecânicos. This study aimed to evaluate the stress distribution in full-arch fixed mandibular prosthesis (Branemärk type) with infrastructure made of different materials and techniques, and under compressive force, through photoelastic and strain gauge analysis. A photoelastic cast of an edentulous jaw was fabricated and received five external hexagon implants (4x11mm) between the mental foramen. The groups were divided into: Group I - Nickel-Chrome fused infrastructure with acrylic resin occlusal coating; Group II - Nickel-Chrome fused infrastructure with ceramic occlusal coating; Group III - Yttria-stabilized zirconia fused infrastructure with ceramic coating. First, the photoelastic analysis was performed and later the strain gauge analysis. A force of 70 N was applied by using a testing machine (EMIC) in the region of the most anterior implant, between incisors, and in the center of the first molar on each side. The images were analyzed by a blinded evaluator through images and by using Adobe Photoshop CS6, according to the number of high intensity fringes in each group. Regarding the strain gauge analysis, the stress measure was performed in two distinct regions. For the first region, two resistance strain gauges were placed horizontally in the mesial and distal regions of the five implants, directly on the marginal ridge of the photoelastic cast. For the second region, the photoelastic resin was removed on the buccal and lingual surfaces of each implant, leaving 1 mm of intact resin, where the strain gauges were placed vertically. The same compression tests described above were carried out. Data were submitted to two-way ANOVA and to the Tukey post-hoc test with 5% level of significance. The results of both methods showed lower stress values for Group I, when compared to other groups. It can be concluded that when rigid materials are used for infrastructure fabrication, the esthetic coating influences the load generated on the marginal bone around the implant. The ceramic coating showed less satisfactory results. FAPESP: 2014/14088-0 FAPESP: 2014/11605-3

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Esfandiari, Shahrokh. "Oral health technology assessment : study of mandibular 2-implant overdentures." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115892.

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There is little evidence that Health Technology Assessment (HTA) is much used in dentistry. Dental implant technology is an example of innovative oral health technology. The objectives of this research were to gather the evidence needed for the assessment of overdenture implant treatment so that both patients and dental practitioners can make informed decisions about this technology. These objectives included 1) investigating what types of dental clinicians adopt and provide dental implants 2) determining the effect of the clinicians' experience in the provision of implant supported prostheses and 3) measuring the patients' preference in provision of mandibular 2-implants overdenture technology. For the first part, a cross-sectional survey was sent to all licensed Canadian Dentists to measure the adoption and provision of implant technology. For the second part, we used the data on the first 140 edentulous elders who were enrolled in a randomized controlled clinical trial to compare the effects of mandibular conventional (CD) and 2-implant overdentures (IOD) on nutrition. The change in patient ratings of satisfaction after treatment, laboratory costs and the number of unscheduled visits were compared. For the last part, edentulous elders (N=36) who were wearing maxillary dentures and either a mandibular conventional denture (CD, n=13) or a two-implant overdenture (IOD, n=23) participated in this study. Participants' preference was measured during a 20-minute interview. Multivariate regression analysis on the data from the first part of the study shows that the Dentist's gender, province of practice, specialty, and whether they practice alone or in association with other practitioners, are significantly associated with the adoption of implant technology (p<0.05). It is also shown that there was no difference in satisfaction scores for either prosthesis between the groups treated by experienced specialists or new dentists. Furthermore, it is shown that IOD wearers were willing to pay three times more than the current cost of conventional dentures for implant prostheses (p<0.05). Overall, the results of this study 1) inform decision makers on what types of clinicians provide implant technology and 2) suggest that, with minimal training, all dental clinicians irrespective of their specialty, can provide successful implant overdenture prostheses that edentulous patients are willing to pay for.

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Müller, Rainer, Andreas Höhlein, Annette Wolf, Jutta Markwardt, Matthias C. Schulz, Ursula Range, and Bernd Reitemeier. "Evaluation of Selected Speech Parameters after Prosthesis Supply in Patients with Maxillary or Mandibular Defects." Karger, 2013. https://tud.qucosa.de/id/qucosa%3A71635.

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Background: Ablative surgery of oropharyngeal tumors frequently leads to defects in the speech organs, resulting in impairment of speech up to the point of unintelligibility. The aim of the present study was the assessment of selected parameters of speech with and without resection prostheses. Patients and Methods: The speech sounds of 22 patients suffering from maxillary and mandibular defects were recorded using a digital audio tape (DAT) recorder with and without resection prostheses. Evaluation of the resonance and the production of the sounds /s/, /sch/, and /ch/ was performed by 2 experienced speech therapists. Additionally, the patients completed a non-standardized questionnaire containing a linguistic self-assessment. Results: After prosthesis supply, the number of patients with rhinophonia aperta decreased from 7 to 2 while the number of patients with intelligible speech increased from 2 to 20. Correct production of the sounds /s/, /sch/, and /ch/ increased from 2 to 13 patients. A significant improvement of the evaluated parameters could be observed only in patients with maxillary defects. The linguistic self-assessment showed a higher satisfaction in patients with maxillary defects. Conclusion: In patients with maxillary defects due to ablative tumor surgery, an increase in speech performance and intelligibility is possible by supplying resection prostheses.

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Pizzol, Karina Eiras Dela Coleta. "Alterações do tecido mole, espaço faríngeo e estabilidade após avanço maxilo-mandibular xom rotação anti-horária e prótese total de ATM /." Araraquara : [s.n.], 2008. http://hdl.handle.net/11449/104485.

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Orientador: João Roberto Gonçalves Banca: Ary dos Santos-Pinto Banca: Roberto Henrique Barbeiro Banca: Darceny Zanetta Barbosa Banca: Terumi Okada Resumo: Este estudo avaliou a resposta do tecido mole, do espaço faríngeo e a estabilidade após avanço maxilo-mandibular com rotação anti-horária e reconstrução da ATM com próteses totais articulares do tipo TMJ Concepts system®. As mudanças cirúrgicas e pós-cirúrgicas foram analisadas utilizando-se telerradiografias laterais. Com o movimento cirúrgico, houve redução do ângulo do plano oclusal (14,9 ± 8,0°) e aumento do espaço aéreo faríngeo - PASnar (4,9mm). A região anterior da maxila moveu-se para a frente e para cima enquanto a porção posterior, para a frente e para baixo. A mandíbula avançou, e sofreu rotação no sentido anti-horário. No período pós-cirúrgico, a maxila apresentou alterações mínimas no plano horizontal, enquanto todas as medidas mandibulares permaneceram estáveis. A postura da cabeça (OPT/NS) mostrou flexão imediatamente após a cirurgia e extensão em longo prazo, enquanto a curvatura cervical (OPT/CVT) não apresentou mudanças. Os resultados cirúrgicos mostraram ainda aumento das distâncias entre a terceira vértebra cervical (C3) e o mento e desta com o hióide, permanecendo estáveis durante o período de observação. A distância entre o osso hióide e o plano mandibular reduziu durante e após a cirurgia. Já a resposta do tecido mole evidenciou diferentes razões entre tecido duro/mole nos pacientes com e sem genioplastia. As mudanças horizontais na morfologia do lábio superior após avanço, impacção da maxila, sutura em VY e sutura da base alar mostraram maior movimento do que as mudanças observadas em tecido duro. O avanço maxilo-mandibular com rotação anti-horária do plano oclusal associado a próteses totais de ATM (TMJ Concepts system®) mostrou-se estável durante o período de observação. O espaço aéreo faríngeo aumentou... (Resumo completo, clicar acesso eletrônico abaixo) Abstract: This study evaluated stability, soft tissue response and oropharyngeal airway space changes after maxillo-mandibular advancement and counter-clockwise rotation with TMJ reconstruction using TMJ Concepts system® total joint prostheses. Lateral cephalograms were analyzed to estimate surgical and post surgical changes. During surgery, the occlusal plane angle decreased 14.9 ± 8.0° and the retroglossal airway space (PASnar) increased 4.9mm. The anterior region of maxilla moved forward and upward while the posterior nasal spine moved downward and forward. The mandible changed forward and rotated in a counter-clockwise direction. At long-term follow-up evaluation the maxilla showed minor horizontal changes, while all mandibular measurements remained stable. Head posture (OPT/NS) showed flexure immediately after surgery and extension long-term post surgery, while cervical curvature (OPT/CVT) had no significant changes. Surgery increased the distances between the third cervical vertebrae (C3) and menton, and C3 and hyoid, remaining stable afterwards. The distance from the hyoid to the mandibular plane decreased during surgery and in the longest follow-up. Soft tissue response indicated different hard/soft tissue ratios between patients with or without genioplasties. Horizontal changes in upper lip morphology after maxillary advancement/impaction, VY closure, and alar base cinch sutures showed greater movement, than observed in hard tissue. TMJ Concepts total joint prostheses associated with maxillo-mandibular advancement and counter-clockwise rotation showed to be stable during the follow-up observation period. Immediate increase in oropharyngeal airway dimension, was influenced by post-surgical changes in head posture but remained stable over the follow-up period. Soft tissue changes showed a known predictable response. Doutor

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Pizzol, Karina Eiras Dela Coleta [UNESP]. "Alterações do tecido mole, espaço faríngeo e estabilidade após avanço maxilo-mandibular xom rotação anti-horária e prótese total de ATM." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/104485.

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Made available in DSpace on 2014-06-11T19:33:22Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-09-23Bitstream added on 2014-06-13T19:23:12Z : No. of bitstreams: 1 pizzol_kec_dr_arafo.pdf: 688008 bytes, checksum: 35e9164526c1e0e9be53fc6134f7ea9a (MD5) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Este estudo avaliou a resposta do tecido mole, do espaço faríngeo e a estabilidade após avanço maxilo-mandibular com rotação anti-horária e reconstrução da ATM com próteses totais articulares do tipo TMJ Concepts system®. As mudanças cirúrgicas e pós-cirúrgicas foram analisadas utilizando-se telerradiografias laterais. Com o movimento cirúrgico, houve redução do ângulo do plano oclusal (14,9 ± 8,0°) e aumento do espaço aéreo faríngeo - PASnar (4,9mm). A região anterior da maxila moveu-se para a frente e para cima enquanto a porção posterior, para a frente e para baixo. A mandíbula avançou, e sofreu rotação no sentido anti-horário. No período pós-cirúrgico, a maxila apresentou alterações mínimas no plano horizontal, enquanto todas as medidas mandibulares permaneceram estáveis. A postura da cabeça (OPT/NS) mostrou flexão imediatamente após a cirurgia e extensão em longo prazo, enquanto a curvatura cervical (OPT/CVT) não apresentou mudanças. Os resultados cirúrgicos mostraram ainda aumento das distâncias entre a terceira vértebra cervical (C3) e o mento e desta com o hióide, permanecendo estáveis durante o período de observação. A distância entre o osso hióide e o plano mandibular reduziu durante e após a cirurgia. Já a resposta do tecido mole evidenciou diferentes razões entre tecido duro/mole nos pacientes com e sem genioplastia. As mudanças horizontais na morfologia do lábio superior após avanço, impacção da maxila, sutura em VY e sutura da base alar mostraram maior movimento do que as mudanças observadas em tecido duro. O avanço maxilo-mandibular com rotação anti-horária do plano oclusal associado a próteses totais de ATM (TMJ Concepts system®) mostrou-se estável durante o período de observação. O espaço aéreo faríngeo aumentou... This study evaluated stability, soft tissue response and oropharyngeal airway space changes after maxillo-mandibular advancement and counter-clockwise rotation with TMJ reconstruction using TMJ Concepts system® total joint prostheses. Lateral cephalograms were analyzed to estimate surgical and post surgical changes. During surgery, the occlusal plane angle decreased 14.9 ± 8.0° and the retroglossal airway space (PASnar) increased 4.9mm. The anterior region of maxilla moved forward and upward while the posterior nasal spine moved downward and forward. The mandible changed forward and rotated in a counter-clockwise direction. At long-term follow-up evaluation the maxilla showed minor horizontal changes, while all mandibular measurements remained stable. Head posture (OPT/NS) showed flexure immediately after surgery and extension long-term post surgery, while cervical curvature (OPT/CVT) had no significant changes. Surgery increased the distances between the third cervical vertebrae (C3) and menton, and C3 and hyoid, remaining stable afterwards. The distance from the hyoid to the mandibular plane decreased during surgery and in the longest follow-up. Soft tissue response indicated different hard/soft tissue ratios between patients with or without genioplasties. Horizontal changes in upper lip morphology after maxillary advancement/impaction, VY closure, and alar base cinch sutures showed greater movement, than observed in hard tissue. TMJ Concepts total joint prostheses associated with maxillo-mandibular advancement and counter-clockwise rotation showed to be stable during the follow-up observation period. Immediate increase in oropharyngeal airway dimension, was influenced by post-surgical changes in head posture but remained stable over the follow-up period. Soft tissue changes showed a known predictable response.

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Reitemeier, Bernd, Michael Unger, Gert Richter, Barbara Ender, Ursula Range, and Jutta Markwardt. "Clinical Test of Masticatory Efficacy in Patients with Maxillary/Mandibular Defects Due to Tumors." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-134891.

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Background: The goal of the study was to evaluate the masticatory efficacy in patients who had been provided with resection prostheses after tumor removal in the maxillary/ mandibular region. These patients complained of impairment of masticatory function. Patients and Methods: 3 groups of patients were compared under clinical-experimental conditions. A uniform chewing material was masticated by the participants under standardized conditions. A sieving procedure was used to evaluate the masticatory efficacy. Analysis of the particle sizes and particle masses obtained was performed with the aid of computers. Results: The results showed that the masticatory efficacy of the patients with resection prostheses was the lowest of the 3 groups compared. The number of existing supporting zones and the location of the defect were found to be important influencing factors. Recording of the dietary habits of all patients was performed using a standardized dietary questionnaire. These data were analyzed using the corresponding software of the German Nutrition Society. With regard to the patients with resection prostheses, it was revealed that they often switched to food that did not require mastication. Conclusions: A nutritional guideline for patients with resection prostheses was developed, which is available for downloading free of charge on the Internet Hintergrund: Ziel der Untersuchung war die Prüfung der Kaueffektivität bei Patienten, die mit Resektionsprothesen nach Tumorentfernung im Kieferbereich versorgt worden waren. Diese Patienten klagten über eine Einschränkung der mastikatorischen Funktion. Patienten und Methoden: Unter klinisch xperimentellen Bedingungen erfolgte der Vergleich von 3 Patientengruppen. Unter standardisierten Bedingungen zerkleinerten die Patienten einheitliches Kaugut. Zur Bewertung der Kaueffektivität wurde ein Siebverfahren eingesetzt. Die Auswertung der ermittelten Partikelgrößen und Partikelmassen erfolgte computergestützt. Ergebnisse: Die Ergebnisse zeigten, dass im Vergleich der 3 Gruppen die Kaueffektivität der Patienten mit Resektionsprothesen am geringsten war. Die Zahl der vorhandenen Stützzonen des Restgebisses und die Defektlokalisation wurden als bedeutsame Einflussfaktoren ermittelt. Die Erfassung der Ernährungsgewohnheiten aller Patienten erfolgte mittels eines standardisierten Ernährungsfragebogens. Diese Daten wurden mit der zugehörigen Software der Deutschen Gesellschaft für Ernährung ausgewertet. Bei den Patienten mit Resektionsprothesen zeigte sich, dass diese auf Nahrungsmittel ausweichen, die kein Kauen erfordern. Schlussfolgerungen: Es wurde eine Ernährungsrichtlinie für Patienten mit Resektionsprothesen abgeleitet, die zum kostenfreien Herunterladen im Internet zur Verfügung steht Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich

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Reitemeier, Bernd, Michael Unger, Gert Richter, Barbara Ender, Ursula Range, and Jutta Markwardt. "Clinical Test of Masticatory Efficacy in Patients with Maxillary/Mandibular Defects Due to Tumors." Karger, 2012. https://tud.qucosa.de/id/qucosa%3A27602.

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Background: The goal of the study was to evaluate the masticatory efficacy in patients who had been provided with resection prostheses after tumor removal in the maxillary/ mandibular region. These patients complained of impairment of masticatory function. Patients and Methods: 3 groups of patients were compared under clinical-experimental conditions. A uniform chewing material was masticated by the participants under standardized conditions. A sieving procedure was used to evaluate the masticatory efficacy. Analysis of the particle sizes and particle masses obtained was performed with the aid of computers. Results: The results showed that the masticatory efficacy of the patients with resection prostheses was the lowest of the 3 groups compared. The number of existing supporting zones and the location of the defect were found to be important influencing factors. Recording of the dietary habits of all patients was performed using a standardized dietary questionnaire. These data were analyzed using the corresponding software of the German Nutrition Society. With regard to the patients with resection prostheses, it was revealed that they often switched to food that did not require mastication. Conclusions: A nutritional guideline for patients with resection prostheses was developed, which is available for downloading free of charge on the Internet. Hintergrund: Ziel der Untersuchung war die Prüfung der Kaueffektivität bei Patienten, die mit Resektionsprothesen nach Tumorentfernung im Kieferbereich versorgt worden waren. Diese Patienten klagten über eine Einschränkung der mastikatorischen Funktion. Patienten und Methoden: Unter klinisch xperimentellen Bedingungen erfolgte der Vergleich von 3 Patientengruppen. Unter standardisierten Bedingungen zerkleinerten die Patienten einheitliches Kaugut. Zur Bewertung der Kaueffektivität wurde ein Siebverfahren eingesetzt. Die Auswertung der ermittelten Partikelgrößen und Partikelmassen erfolgte computergestützt. Ergebnisse: Die Ergebnisse zeigten, dass im Vergleich der 3 Gruppen die Kaueffektivität der Patienten mit Resektionsprothesen am geringsten war. Die Zahl der vorhandenen Stützzonen des Restgebisses und die Defektlokalisation wurden als bedeutsame Einflussfaktoren ermittelt. Die Erfassung der Ernährungsgewohnheiten aller Patienten erfolgte mittels eines standardisierten Ernährungsfragebogens. Diese Daten wurden mit der zugehörigen Software der Deutschen Gesellschaft für Ernährung ausgewertet. Bei den Patienten mit Resektionsprothesen zeigte sich, dass diese auf Nahrungsmittel ausweichen, die kein Kauen erfordern. Schlussfolgerungen: Es wurde eine Ernährungsrichtlinie für Patienten mit Resektionsprothesen abgeleitet, die zum kostenfreien Herunterladen im Internet zur Verfügung steht. Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.

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Sbardelotto, Cristian. "Análise da distribuição de tensão em protocolo mandibular confeccionado pelo sistema convencional e CAD/CAM, variando tipo, número e inclinação dos implantes." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-17022016-153631/.

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As próteses totais fixas implantossuportadas tem ganhado cada dia mais seu espaço no tratamento reabilitador de pacientes edêntulos, pois se trata de uma forma de tratamento que atende todos os quesitos funcionais e estéticos. Ainda não existe na literatura um consenso de qual a configuração que melhor distribui as tensões aos implantes e tecidos adjacentes. O objetivo deste estudo foi comparar as tensões geradas na interface osso-implante de próteses totais mandibulares implantossuportadas através do método de correlação de imagens digitais (CID). Foram analisadas duas configurações diferentes quanto a quantidade e posicionamento de implantes (4 ou 5 implantes), diferentes conexões [hexágono externo (HE) e cone morse (CM)] e barras para prótese fixa implantossuportada obtidas por fundição convencional e usinadas pelo sistema CAD/CAM. Foram confeccionados modelos em poliuretano, utilizando implantes de 3,75x11mm, divididos em 8 grupos: G1 (5 implantes/HE/CAD-CAM), G2 (5 Implantes/CM/CAD CAM), G3 (5 Implantes/HE/Convencional), G4 (5 Implantes/CM/Convencional), G5 (4 Implantes/HE/CAD CAM), G6 (4 Implantes/CM/CAD CAM), G7 (4 Implantes/HE/Convencional) e G8 (4 Implantes/CM/Convencional). A análise por CID foi feita quantitativamente e qualitativamente, com aplicação de carga de 250N na fossa central do primeiro molar inferior, onde foram estabelecidas diferentes regiões de interesse para a análise, sendo denominadas de C1 (cervical 1) e A1 (apical 1) para região distal ao último implante, C2 (cervical 2) e A2 (apical) para região mesial ao último implante. Foram encontradas diferenças estatisticamente significantes para o número de implantes em todas as regiões analisadas [C1 (p=0,002), A1 (p=0,01), C2 (p=0,001), A2 (p=0,004)], para as conexões foram encontradas diferenças na região C2 (p<0,05) e para as barras na região A2 (p=0,003). De acordo com os resultados pode-se concluir que as prótese com 4 implantes apresentaram maior quantidade de tensões por tração nas regiões apicais, não houve diferença significativa na concentração de tensões para as conexões HE e CM, exceto para a região C2, onde houve maior concentração de tensão para conexão CM e em comparação ao método de obtenção das barras, as barras convencionais apresentaram maior concentração de tensões de tração nas próteses com 5 implantes. The implant-supported fixed dental prostheses have been used to rehabilitate edentulous patients as it fulfills not only functional aspects but also esthetic questions. Literature shows that there is no consensus about the best configuration to distribute stress to the implants and surrounding tissues. The objective of this study was to compare the stress generated at the boneimplant interface of implant-supported mandibular dentures by a digital image correlation method (DIC). Two different configurations were analyzed for the implants quantity and position (4 or 5 implants), different connections [external hexagon (EH) and Cone Morse (CM)] and bars for implant-supported fixed prosthesis obtained by conventional casting and machined by CAD/CAM system. Models were prepared from polyurethane and implants (3.75x11mm) were divided in 8 groups: G1 (5 implants/EH/CAD-CAM), G2 (5 Implants/CM/CAD-CAM), G3 (5 Implants/EH/Conventional) , G4 (5 Implants/CM/Conventional), G5 (4 Implants/EH/CAD-CAM), G6 (4 Implants/CM/CAD-CAM) G7 (4 Implants/EH/Conventional) and G8 (4 Implants/CM/Conventional). DIC analysis were quantitative and qualitatively made with a 250N load at first molar central fossa, which were established in different regions of interest for analysis as C1 (cervical 1) and A1 (apical 1) to distal to the last implant, C2 (cervical 2) and A2 (apical) for mesial region to the last implant. Statistically significant differences were found for number of implants in all regions examined [C1 (p=0.002), A1 (p=0.01), C2 (p=0.001) and A2 (p=0.004)], for connections differences were found in the C2 region (p <0.05) and for the bar region at A2 (p=0.003). According to the results it can be concluded that the prosthesis with four implants showed a higher stress at the apical regions, there was no significant difference in the concentration of stress for EH and CM connections, except for the C2 region, where there was a higher concentration of stress for CM connection, and comparing bars obtained methods, conventional bars showed a higher concentration of stresses in prosthesis with 5 implants.

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Purcell, Bradley Allen. "Prosthetic Complications in Mandibular Fixed-Removable Implant Prostheses Opposed by Complete Dentures: A 5-9 years Analysis." The Ohio State University, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=osu1419870196.

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Gupta, Saurabh. "Maxillary Changes Under Conventional Dentures Opposing Mandibular Implant-Supported Fixed Prostheses." Thesis, Faculty of Dentistry, 1998. http://hdl.handle.net/2123/5100.

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Chamoko, Joanna Yeukai. "Outcomes of mandibular Kennedy class I and II prosthetic rehabilitation." University of the Western Cape, 2018. http://hdl.handle.net/11394/6249.

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Magister Scientiae Dentium - MSc(Dent) (Restorative Dentistry) Loss of teeth has a negative impact on appearance, nutrition, function and diet. Rehabilitation of tooth loss is an important function of oral health care. Rehabilitation with removable prosthesis of mandibular terminal edentulous areas has been associated with more negative outcomes than of tooth-bounded regions.

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Shin, Kyungsup. "Effect of temporary prosthetic mandibular advancement on velopharyngeal closure for speech." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1903.

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Introduction: Velopharyngeal inadequacy (VPI) may result in inappropriate oral/nasal coupling during the production of speech sounds, resulting in unwanted nasal resonance and/or nasal air emission. Orthognathic surgeries such as maxillary and/or mandibular advancements are also known to change skeletal and muscular structures resulting in changes affecting velopharyngeal closure (VPC). Although many studies have reported on the effect of maxillary advancement surgery on VPI for patients with cleft lip and palate, the effect of mandibular advancement on VPI has not been studied at length. The purpose of this study was to elucidate the effect of temporary prosthetic mandibular advancement on velopharyngeal function. Methods: Fourteen subjects (7 males, 7 females) with no history of craniofacial abnormalities or speech disorders were recruited. The mean age was 35 years (range = 26-60). Acoustic nasalance measurements were obtained during nasal sentences and during sentences without nasal consonants in two conditions; normally, and while wearing an elastic mandibular advancement (EMA) appliance to advance the mandible by 13mm. In addition, subjects were asked to produce five repetitions of the sentence "Ten men came in when Jane left" while recordings were obtained with a videoendoscopy/phototransducer system that sensed the amount of light passing through the velopharyngeal orifice. The endoscope and fiber optic light were inserted through the subject's middle nasal meatus and positioned above the velum. The phototransducer fiber was extended through the velopharyngeal port into the upper oropharynx to detect light passing through the orifice as the velopharyngeal mechanism opened and closed. Individual subject's outcomes with and without the EMA appliance were analyzed statistically using paired t-test for Nasalance test, and one-way ANOVA/independent samples t-test for phototransducer test. Results: Nasalance did not deteriorate, but significantly decreased for the ‘nasal’ sentences after mandibular advancement, whereas changes in nasalance were not significant for the sentences containing no nasal consonants after mandibular advancement. Mandibular advancement by a 13 mm using an EMA appliance did not significantly affect VPC. Instead, large variability among subjects in response to mandibular advancement. For 7 of the 14 subjects, the extent of VPC decreased significantly (p < .05) under the advanced mandible condition compared to the normal condition (without the EMA appliance). On the other hand, 5 subjects showed significantly (p < .05) increased VPC when their mandibles were advanced. For 2 subjects, VPC was not significantly changed with the advanced mandible. Conclusions: The outcomes of this study suggested that there was no statistical evidence to support that nasality was deteriorated by a 13mm mandibular advancement, which agreed with recent studies describing velopharyngeal function and nasality after orthognathic surgeries. VPC was not affected by mandibular advancement. Responses of the nasalance and VPC to mandibular advancement were dependent on the individuals. Further investigation such as electromyography method is needed to understand how velopharyngeal function and speech respond to mandibular advancement more definitely.

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Burnett, Christopher Andrew. "An electrognathographic analysis of mandibular anterior tooth position during speech." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387981.

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Tang, Ling. "A within-subject comparison of mandibular long-bar and hybrid implant-supported prostheses." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0015/NQ43038.pdf.

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Salles, Angelo Emilio Barroso de. "Analise fotoelastica da distribuição de tensões em dois sistemas de proteses mandibulares sobre implantes : barra distal e solda a laser." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288262.

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Orientador: Mauro Antonio de Arruda Nobilo Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-12T16:14:35Z (GMT). No. of bitstreams: 1 Salles_AngeloEmilioBarrosode_M.pdf: 10746117 bytes, checksum: 7a6d08147fb33c8d235cc7df5f8be032 (MD5) Previous issue date: 2008 Resumo: Este estudo avaliou por meio de análise fotoelástica, a distribuição in vitro das tensões geradas na interface "osso/implante" em próteses mandibulares, tipo protocolo, comparando duas técnicas de confecção: Solda a laser e Barra Distal (Neodent, Curitiba - PR) onde não se utiliza infra-estrutura metálica. Foram confeccionadas duas próteses com design similares (uma para cada técnica), sobre uma matriz metálica simulando um arco mandibular edêntulo, onde foram instaladas cinco réplicas de implantes de corpo único (GT- Neodent, Curitiba - PR). A partir de um molde de silicone de duplicação (Silibor - Clássico Artigos Odontológicos Ltda.) foi confeccionado um modelo em resina fotoelástica (Araldite GY279BR - Araltec Produtos Químicos Ltda. Guarulhos - SP) com cinco implantes GT (Neodent, Curitiba - PR) incorporados. Após a instalação de cada prótese sobre o modelo fotoelástico, utilizando 10 N/cm para aperto dos parafusos, foi realizada análise fotoelástica. Em seguida, foi aplicada carga oclusal de 100 N em toda extensão de cada prótese, com auxílio de uma placa metálica posicionada sobre a face oclusal dos dentes, e então realizada nova análise das tensões. Estas análises foram executadas com o auxílio de um polariscópio circular acoplado a uma máquina fotográfica digital (H1 - Sony, Japão), que permitiu a visualização das franjas e registrou através de fotografias digitais o comportamento das mesmas ao redor dos implantes no modelo fotoelástico. De acordo com os resultados, concluiu-se que a técnica utilizando Barra Distal distribuiu melhor, e transmitiu com menos intensidade, após o aperto dos parafusos, as tensões geradas na interface "osso/implantes" do que a técnica utilizando solda a laser. No entanto, ocorreu o inverso após o carregamento oclusal. Abstract: The aim of this study was to evaluate through photoelastic analysis, the in vitro distribution of the generated tensions in the "bone/ implant" interface in mandibular prostheses, protocol type, comparing two different working techniques: the idealized by Branemark and Distal Bar (Neodent, Curitiba - PR) where framework is not used. Two similar prostheses were made (one for each technique), on a metal matrix simulating an edentulous mandible, where five replications of single body implant were installed (GT-Neodent, Curitiba - PR). From a silicone mold for duplication (Silibor - Classico Artigos Odontológicos Ltda.), a model in photoelastic resin was created (Araldite GY279BR - Araltec Produtos Quimicos Ltda., Guarulhos - SP) with five GT implants (Neodent, Curitiba - PR) embedded. After the installation of each prosthesis on the photoelastic model, using 10 N/cm for tightening the screws, a photoelastic analysis was performed. Then a 100 N occlusion load was applied throughout each prosthesis extension with the help of a metal plate positioned on the occlusal face of the teeth, and then a new analysis of the tensions was conducted. These analyses were performed with the help of a circular polariscope attached to a digital camera (H1 - Sony, Japan), which allowed the visualization of the fringes and recorded by digital photos the behaviour of the implants. According to the results, it was concluded that the Distal Bar technique distributed better, and transmitted with less intensity, after the tightening of the screws, the generated tensions to the system "bone/implants" than the laser welding. However, it happened the opposite after the occlusal load. Mestrado Protese Dental Mestre em Clínica Odontológica

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Santos, Fernanda Henriques dos 1980. "Caracterização de polivinilálcool e polivinilpirrolidona (PVAI/PVP) para reparo de cartilagem articular mandibular." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263590.

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Orientadores: Cecília Amélia de Carvalho Zavaglia, Vanessa Petrilli Bavaresco Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica Made available in DSpace on 2018-08-18T02:53:41Z (GMT). No. of bitstreams: 1 Santos_FernandaHenriquesdos_M.pdf: 2590038 bytes, checksum: 807936f77ee66231cc661475d6643f25 (MD5) Previous issue date: 2011 Resumo: Na área médica, para se desenvolver um dispositivo que funcione como implante, deve-se utilizar materiais que sejam compatíveis para funções específicas do corpo humano, e esses são classificados como biomateriais. Neste trabalho, foram determinados os parâmetros que serão aplicados ao laser de infravermelho (condutividade térmica do material, densidade do material e comprimento de onda do laser) utilizado na máquina de prototipagem rápida, a qual será usada para a fabricação do implante. Este implante será composto por um biomaterial polimérico a base de Polivinilalcool (PVAl) e, terá como objetivo a substituição da cartilagem articular mandibular. Estudos já avaliaram as propriedades mecânicas de hidrogéis poliméricos de PVAl mostrando sua aplicabilidade como reparadores da cartilagem articular em articulação de quadril, porém a articulação mandibular é submetida à aplicações de cargas superiores havendo a necessidade de melhoria de suas propriedades mecânica. A mistura física de dois ou mais polímeros é denominada blenda polimérica e seu objetivo é aperfeiçoar ou modificar as propriedades dos materiais adequando-as para uma aplicação específica. A literatura relata que PVAl e Polivinilpirrolidona (PVP) são polímeros miscíveis entre si e, quando não reticulados são solúveis em água. O PVP é um polímero amorfo e autolubrificante, e por isso, foi escolhido para melhorar as propriedades mecânicas do PVAl. Blendas nas composições de 90:10 de PVAl e PVP respectivamente, reticuladas via laser infravermelho utilizando concentração de 2,5% de termoiniciador cianovalérico foram caracterizadas via Espectroscopia do Infravermelho Médio, Calorimetria Exploratória Diferencial (DSC), Microscopia Eletrônica de Varredura (MEV) e Extração sol-gel. Através desses experimentos foram determinados os parâmetros do laser para posterior utilização na máquina de prototipagem rápida. Foi possível também realizar a cura do material através do laser de infravermelho. A cura foi confirmada através dos outros ensaios realizados Abstract: In the medical area to develop a device that functions as an implant, one should use materials that are compatible for specific functions of the human body, and these are classified as biomaterials. In this study, we determined the laser parameters that will be applied to the infrared laser (thermal conductivity, material density and wavelength of the laser) in rapid prototyping machine, which will be used to manufacture the implant. This implant is a polymeric biomaterial based on polyvinylalcool (PVAl) and will aim to replace the articular cartilage of the mandible. Studies have evaluated the mechanical properties of polymeric hydrogels PVAl showing its applicability as repairing articular cartilage in hip joint, but the mandibular joint is subjected to loads greater than applications having the need to improve their mechanical properties. The physical mixture of two or more polymers is called polymer blend and its goal is to improve or modify the properties of materials making them suitable for a specific application. The literature reports that PVAl and PVP polymers are miscible and, when not crosslinked, are soluble in water. PVP is an amorphous polymer and selflubricating, and therefore was chosen to improve the mechanical properties of PVAl. Blends in the compositions of 90:10 PVAl and PVP respectively, crosslinked using infrared concentration of 2.5% termoiniciador cianovaléric were characterized by mid-infrared spectroscopy, Differential Scanning Calorimetry (DSC), Scanning Electron Microscopy (SEM) and sol-gel fraction. Through these experiments were determined laser parameters for subsequent use in rapid prototyping machine. It was also possible to realize the cure of material through the infrared laser. The cure was confirmed by other tests Mestrado Materiais e Processos de Fabricação Mestre em Engenharia Mecânica

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Campana, Júlia Trevizam 1989. "Influência do número de implantes no comportamento biomecânico de overdentures mandibulares : análise fotoelástica." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288538.

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Orientador: Rafael Leonardo Xediek Consani Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba Made available in DSpace on 2018-08-27T08:10:23Z (GMT). No. of bitstreams: 1 Campana_JuliaTrevizam_M.pdf: 13654859 bytes, checksum: 968de9ae31cd28485a92b1f5b52edc6c (MD5) Previous issue date: 2015 Resumo: O objetivo neste estudo in vitro foi avaliar por meio da análise fotoelástica o comportamento das tensões induzidas em diferentes overdentures. Os grupos experimentais foram: I- overdenture retida por um implante colocado na linha média da mandíbula; II- overdenture retida por dois implantes distantes 20 mm entre si; III- overdenture retida por três implantes, com o central colocado na linha média da mandíbula e os restantes distantes 18 mm de cada lado; e IV- overdenture retida por quatro implantes distantes 12 mm entre si. Para o estudo foi confeccionada uma prótese overdenture mandibular para cada grupo experimental e uma prótese total superior convencional, possibilitando que a análise fotoelástica fosse conduzida com as próteses se relacionando em máxima intercuspidação habitual. Foram feitos carregamentos axiais de 10, 20 e 30 kgf em cada modelo fotoelástico mandibular. Também foi realizado carregamento na oclusal dos primeiros molares direito e esquerdo de cada modelo com mesma intensidade de carga, para simular o efeito da mastigação. Dois tipos de avaliação foram conduzidos: qualitativa, por meio da análise das imagens obtidas com fotografias do modelo em polariscópio, e quantitativa, com as imagens analisadas no programa FRINGES. A análise qualitativa mostrou que a distribuição das tensões no Grupo I foi diferente dos Grupos II, III e IV, com maior quantidade de franjas concentradas na região posterior da mandíbula. O grupo IV apresentou melhor distribuição de tensão quando comparado aos Grupos II e III. Na análise quantitativa, a overdenture retida por um implante (Grupo I) mostrou valores de tensão similares aos Grupos II, III e IV. Com base nesses resultados pode-se concluir que: em todas as overdentures a tensão se concentrou predominantemente ao redor dos implantes; o aumento do carregamento oclusal ou pontual promoveu aumento das tensões induzidas sobre os implantes; maior tensão foi induzida no lado da aplicação da carga pontual, principalmente, quando a overdenture era suportada por um implante, e a concentração da tensão em overdenture suportada por maior quantidade de implante mostrou distribuição mais homogenia das tensões induzidas Abstract: The aim of this in vitro study was to evaluate through photoelastic analysis the behavior of the induced stress in different overdentures. The experimental groups were: I- overdenture retained by one implant placed in the midline of the mandible; II- overdenture retained by two implants 20 mm distant from each other; III- overdenture retained by three implants, with the center placed on the midline of the mandible and the other distant 18 mm on each side; and IV- overdenture retained by four implants 12 mm distant from each other. For the study was made a prosthetic mandibular overdenture for each experimental group and a conventional complete denture, allowing the photoelastic analysis was conducted with the dentures related in maximum intercuspation. Axial loads of 10, 20 and 30 kgf were made in each mandibular photoelastic model. It was also performed on the occlusal loading of the first left and right molars of each model with similar load intensity to simulate the effect of mastication. Two types of evaluation were conducted: qualitative, by analyzing the images from photographs obtained with polariscope, and quantitative, with the images analyzed by the FRINGES program. Qualitative analysis showed that the distribution of tensions in Group I was different from the Groups II, III and IV, showing a higher amount of concentrated fringes on the posterior region of the mandible. Group IV showed better stress distribution when compared to Groups II and III. In the quantitative analysis, the overdenture retained by implant (Group I) showed similar stress values for Groups II, III and IV. Based on these results, it can be concluded that in all overdentures the stresses focused predominantly around the implants; increased single and occlusal loading promoted an increase of induced stresses on the implants; higher stress was induced on the application side, especially when the overdenture was supported by one implant; and stress concentration in overdenture supported by a larger amount of implantation showed more homogeneous stress distribution Mestrado Protese Dental Mestra em Clínica Odontológica

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Zaze, Cesar Aurélio. "Análise da variação da posição relativa dos dentes artificiais no arco dental em função do processamento de próteses totais mandibulares mensurada por computação gráfica /." Araçatuba : [s.n.], 2005. http://hdl.handle.net/11449/97381.

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Orientador: Humberto Gennari Filho Banca: Helena de Freitas Oliveira Paranhos Banca: Antonio Plese Resumo: Este trabalho foi idealizado com o intuito de contribuir para os estudos pertinentes à área da prótese total, e teve como objetivo analisar a alteração da posição relativa dos dentes artificiais em razão do processamento de 40 próteses totais inferiores, obtidas por uma matriz de silicone pré-moldada. Na metodologia, as próteses foram divididas em quatro grupos de 10, que receberam os seguintes tratamentos: Grupo 1 - inclusão em muflas metálicas com muralha de gesso pedra tipo III e polimerização em banho de água quente; Grupo 2 - inclusão em muflas de fibra de vidro com muralha de gesso pedra tipo III e polimerização em microondas; Grupo 3 - inclusão em muflas metálicas com muralha de silicone e polimerização em banho de água quente e Grupo 4 - inclusão em muflas de fibra de vidro com muralha de silicone e polimerização em microondas. Como conclusões, os resultados demonstraram que houve alteração na posição dos dentes artificiais em todas as técnicas de processamento, com o grupo 3 apresentando os melhores resultados seguido dos grupos 4, 2 e 1. Abstract: The purpose of this study is to analyze the change in denture tooth position in the fabrication of complete mandibular dentures after different processing techniques. A total of 40 mandibular complete dentures, obtained by a premolded matrix of silicon, were fabricated. There were a total of four groups of complete mandibular dentures. Each group consisted of 10 complete mandibular dentures which were fabricated in the following manner: Group 1 - were processed in a metallic flask using stone plaster type III and polymerized in hot water; Group 2 - were processed in a fiberglass flask using stone plaster type III and polymerized in a microwave; Group 3 - were processed in a metallic flask using silicon and stone plaster type III and polymerized in hot water; Group 4 - were processed in a fiberglass flask using silicon and stone plaster type III and polymerized in a microwave. In conclusion, the results demonstrated that there were alterations in tooth position in all processing techniques. However, Group 3 presented with the least amount of change in tooth positon, followed by Group 4, then Group 2, and finally Group 1 with the most amount of change in tooth position. Mestre

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Cavalheiro, Suellen Cristina. "Qualidade de vida, condições clínicas e radiográficas de dois implantes não unidos submetidos à carga imediata de overdenture mandibular: estudo piloto." Universidade Estadual do Oeste do Paraná, 2018. http://tede.unioeste.br/handle/tede/3776.

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Submitted by Rosangela Silva (rosangela.silva3@unioeste.br) on 2018-06-25T20:01:46Z No. of bitstreams: 2 Suellen Cristina Cavalheiro.pdf: 1389300 bytes, checksum: d73926186003baf2e89cc2421c60b2a4 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Made available in DSpace on 2018-06-25T20:01:46Z (GMT). No. of bitstreams: 2 Suellen Cristina Cavalheiro.pdf: 1389300 bytes, checksum: d73926186003baf2e89cc2421c60b2a4 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2018-03-12 This pilot study evaluated the clinical and radiographic peri-implant conditions of two unsplinted implants immediate loaded with mandibular overdentures, as well, evaluated the oral health related quality of life (OHRQoL) in these patients. Materials and Methods: ten totally edentulous patients received 20 implants with ball attachment, being 6 immediate loaded (test group) and 4 conventional loaded (control group). For OHRQoL assessment, the OHIP-EDENT questionnaire was applied before the implants insertion, 3 and 6 months after. After 6 months of implant insertion, the following clinical parameters were evaluated: probing depth, width of the keratinized mucosa, modified bleeding index, modified plaque index. The marginal bone loss was obtained by analyses of periapical radiographs at the day of implant insertion, 3 and 6 months after. Results:There was a significant improvement of quality of life at 3 months in immediate loaded group and at 6 months at the conventional loaded group comparing to initial time (p<0,05) with no significant difference between groups (p>0,05). There was no significant difference between groups for the clinical and radiographic parameters at 6 months.Conclusion: There was no significant difference between groups in all quality of life, clinical and radiographic parameters, however the immediate load provided a better quality of life before the conventional load. Long term studies may be conducted due to follow peri-implant indices and to obtain success index of theimplants. Esse estudo piloto avaliou as condições peri-implantares clínicas e radiográficas de dois implantes não unidos submetidos a carga imediata reabilitados com overdenture mandibular, bem como avaliou a qualidade de vida relacionada à saúde oral nesses pacientes. Materiais e Métodos: Dez pacientes desdentados totais receberam 20 implantes com conexão bola, sendo 6 pacientes submetidos a carga imediata (grupo teste) e 4 a carga convencional (grupo controle). Para avaliação da qualidade de vida foi aplicado o questionário OHIP-EDENT antes da instalação dos implantes, 3 e 6 meses após. Para verificação das condições clínicas, foram analisados: profundidade de sondagem, largura da mucosa queratinizada, índice de sangramento do sulco modificado e índice de placa modificado 6 meses após a instalação dos implantes. A perda óssea marginal foi obtida através da análise de radiografias periapicais no ato da instalação dos implantes, 3 e 6 meses após. Resultados: Houve uma melhora estatisticamente significativa da qualidade de vida em 3 meses para o grupo carga imediata e em 6 meses para o grupo carga convencional em relação ao tempo inicial (p<0,05), sem diferença estatística entre os grupos (p>0,05). Não houve diferença estatística entre os grupos para os índices clínicos e radiográficos em 6 meses. Conclusão: Não houve diferença entre os grupos nos parâmetros clínicos, radiográficos e qualidade de vida, porém a carga imediata proporcionou uma melhor qualidade de vida antes da carga convencional. Estudos em longo prazo devem ser feitos para acompanhar os índices peri-implantares e obter a taxa de sucesso dos implantes.

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Zaze, Cesar Aurélio [UNESP]. "Análise da variação da posição relativa dos dentes artificiais no arco dental em função do processamento de próteses totais mandibulares mensurada por computação gráfica." Universidade Estadual Paulista (UNESP), 2005. http://hdl.handle.net/11449/97381.

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Made available in DSpace on 2014-06-11T19:28:58Z (GMT). No. of bitstreams: 0 Previous issue date: 2005Bitstream added on 2014-06-13T18:35:11Z : No. of bitstreams: 1 zaze_ca_me_araca.pdf: 893710 bytes, checksum: 246541052b07b294999b016436174c3a (MD5) Universidade Estadual Paulista (UNESP) Este trabalho foi idealizado com o intuito de contribuir para os estudos pertinentes à área da prótese total, e teve como objetivo analisar a alteração da posição relativa dos dentes artificiais em razão do processamento de 40 próteses totais inferiores, obtidas por uma matriz de silicone pré-moldada. Na metodologia, as próteses foram divididas em quatro grupos de 10, que receberam os seguintes tratamentos: Grupo 1 - inclusão em muflas metálicas com muralha de gesso pedra tipo III e polimerização em banho de água quente; Grupo 2 - inclusão em muflas de fibra de vidro com muralha de gesso pedra tipo III e polimerização em microondas; Grupo 3 - inclusão em muflas metálicas com muralha de silicone e polimerização em banho de água quente e Grupo 4 - inclusão em muflas de fibra de vidro com muralha de silicone e polimerização em microondas. Como conclusões, os resultados demonstraram que houve alteração na posição dos dentes artificiais em todas as técnicas de processamento, com o grupo 3 apresentando os melhores resultados seguido dos grupos 4, 2 e 1. The purpose of this study is to analyze the change in denture tooth position in the fabrication of complete mandibular dentures after different processing techniques. A total of 40 mandibular complete dentures, obtained by a premolded matrix of silicon, were fabricated. There were a total of four groups of complete mandibular dentures. Each group consisted of 10 complete mandibular dentures which were fabricated in the following manner: Group 1 - were processed in a metallic flask using stone plaster type III and polymerized in hot water; Group 2 - were processed in a fiberglass flask using stone plaster type III and polymerized in a microwave; Group 3 - were processed in a metallic flask using silicon and stone plaster type III and polymerized in hot water; Group 4 - were processed in a fiberglass flask using silicon and stone plaster type III and polymerized in a microwave. In conclusion, the results demonstrated that there were alterations in tooth position in all processing techniques. However, Group 3 presented with the least amount of change in tooth positon, followed by Group 4, then Group 2, and finally Group 1 with the most amount of change in tooth position.

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Junior, Fábio Afrânio de Aguiar. "Avaliação de overdentures mandibulares com diferentes sistemas de retenção: análise fotoelástica da transmissão de tensões e efeito de carga cíclica na força de retenção." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/58/58131/tde-12082013-162434/.

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O surgimento dos implantes osseointegrados melhorou a qualidade de vida de pacientes edêntulos. Seu uso favorece retenção e estabilidade, gerando maior eficiência mastigatória e conforto. O objetivo deste estudo foi avaliar manutenção da força de retenção e padrões de tensões gerados na mandíbula em overdentures confeccionadas com dois sistemas de retenção retidas por 2 ou 3 implantes. Teste de carga cíclica e análise fotoelástica de tensões foram realizados. Para o teste de carga cíclica foram utilizados modelos representativos de mandíbulas desdentadas e os grupos analisados foram: A) 2 implantes com barra clipe; B) 3 implantes com barra clipe; C) 2 implantes com barra clipe e bola/o\'ring nas extremidades; D) 3 implantes com barra clipe e bola/o\'ring nas extremidades. Cinco espécimes por grupo foram submetidos à ciclagem e 5 permaneceram imersos na máquina de ciclagem (controle). As leituras de força de retenção foram realizadas por ensaio de tração em máquina de ensaios universal antes da ciclagem e a cada 500 mil ciclos. A ciclagem foi realizada com frequência de 1,8 Hz, carga de 130 N, por 2 milhões de ciclos. Para a aplicação de carga, foram feitas pontas correspondentes à arcada antagonista unilateral posterior. Os dados obtidos foram analisados estatisticamente pelo modelo linear de efeitos mistos. Para a análise fotoelástica, foi feito um modelo mestre curvo em resina acrílica. O modelo foi preparado para conter cinco implantes, paralelos, distribuídos na região interforaminal. Grupo com 4 implantes com barra clipe e o\'rings nas extremidades foi incluído como controle. Prótese total foi confeccionada e usada em todos os grupos. A cada grupo, nova captura de retentores foi realizada. Para obtenção dos modelos fotoelásticos, foram confeccionados moldes em silicone do modelo mestre. A verificação das tensões em torno dos implantes foi realizada por meio de análise fotoelástica qualitativa de transmissão sob aplicação de carga cêntrica estática de 50 N. Diferentes tipos de pontas e locais de aplicação de carga foram usados. Os resultados demonstraram que carga cíclica influencia na perda de retenção overdentures mandibulares. Comparando grupos controle e teste, observou-se que os grupos com três implantes apresentaram maior influência da ciclagem na perda de retenção. Os sistemas de retenção estudados apresentaram comportamentos diferentes até um milhão de ciclos, após não houve diferença quanto à manutenção de retenção. Todos os grupos mantiveram retenção satisfatória ao final da ciclagem. Três implantes apresentaram maior tensão ao redor dos implantes e pouca ou nenhuma sobre o rebordo. Nos grupos com dois implantes, aplicação de carga posterior gerou tensões no rebordo alveolar e implantes. Grupos com extensões distais evidenciaram uma maior tensão ao redor dos implantes que os sem extensão. The appearance of osseointegrated dental implants improved the quality of life of fully edentulous patients. Implants promote retention and stability, producing higher masticatory efficiency and comfort. The aim of this study was analyze the retention maintenance and the stress pattern generated by two or three implants-supported mandibular overdentures with two attachments systems. Cyclic loading test and photoelastic stress analysis were performed. For the cyclic loading test, edentulous mandibular models were used. The analyzed groups were: A) 2 implants with bar clip; B) 3 implants with bar clip; C) 2 implants with bar clip and balls/o\'rings in the extremity; D) 3 implants with bar clip and balls/o\'rings in the extremity. Five specimens per group were submitted to cyclic loading and five were kept immersed inside the test machine (control group). The measurements of retention force were performed by tensile test in a universal testing machine before cyclic loading and after each 500 thousands cycles. The cycling was performed with frequency of 1.8 Hz, loading of 130 N, up to two million cycles. For the load application, tips corresponding to posterior unilateral antagonist teeth were produced. Data were statistically analyzed by linear mixed-effects model. For the photoelastic analysis, a curved master model was produced in acrylic resin. The model contained five parallel implants, distributed in interforaminal area. A group with 4 implants splinted with bar clip and balls/o\'rings in the extremity was included as a control. Complete denture was made and used in all groups. In each group, incorporating of new attachments was performed. For the obtainment of photoelastic models, silicone impression of the master model was performed. The assessment of stress around implants was done through quantitative transmission photoelastic analysis under static centric load application of 50 N. Different sorts of tips and load application places were used. The results showed that cyclic load influences the retention loss of mandibular overdentures. Comparing test and control groups, it was observed that groups with three implants showed higher influence of cyclic loading in retention loss. The studied attachments systems showed different behaviors up to one million cycles, after that there was not difference in the maintenance of retention. All groups had satisfactory retention at the end of cycling. Groups with three implants showed higher stress around implants and lower or none on alveolar ridge. In groups with two implants, load application on posterior area caused stress on alveolar ridge and implants. Groups with distal extensions demonstrated higher stress around implants than groups without extension.

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Creuillot, Victor. "Étude de l'impact d'une prothèse dentaire implanto-portée sur le comportement des articulations temporo-mandibulaires et de l'os péri-implantaire." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0273/document.

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Cette thèse aborde une étude biomécanique de l’appareil stomatognathique en vue d’analyser les conséquences sur les articulations temporo-mandibulaires (ATM) de la mise en place d’une prothèse complète implanto-portée. Cette étude est réalisée à l’aide de la méthode des éléments finis. Dans ce travail, deux modèles ont été créés. Un premier est basé sur la géométrie d’un sujet sain volontaire sans problèmes articulaires ni dentaires. Un deuxième, avec une restauration de la dentition par une prothèse dentaire complète sur implants, repose sur la géométrie des structures osseuses du cas sain. Une méthodologie a été mise en place pour la construction du modèle éléments finis, basé sur celle développée dans la thèse d’Alvarez. Une comparaison des résultats est effectuée entre les modèles du cas sain d’Alvarez et celui exposé dans ce travail afin d’évaluer l’influence des modifications apportées et de valider ce dernier. Puis une comparaison est effectuée entre le cas sain et restauré pour une ouverture/fermeture modérée de la mâchoire ainsi que lors de la morsure d’aliments au niveau des incisives. Une autre problématique abordée dans cette thèse est l’analyse du risque d’échec de l’implantation dans l’os dont la qualité est dégradée par la perte des dents. Deux géométries d’implants ont été testées pour différentes qualités osseuses, un implant classique et un implant nouvellement breveté This study deals with a biomechanical analysis of the stomatognathic system in order to understand the consequences of complete fixed dental prosthesis on temporomandibular joint (TMJ). The finite element method is used to achieve this goal. Two models have been created, a healthy and restored by prosthesis ones. The first model is based on a healthy volunteer subject morphology, without dental or articular troubles. The restored model is based on the bony structures of the healthy individual. Mandibular teeth have been removed numerically and a complete fixed overdenture has been settled on the mandible. The construction of the finite element model has been set up following the method developed by Alvarez. A comparison between results obtained by both approaches on the healthy case has been done to validate our model and to evaluate the impact of the improvements proposed in this work on mandible behavior. Then a comparison between the healthy and restored cases is done for a moderate opening /closing motion of the jaw and for a foodstuff bite between the incisors. Another problematic is treated in this thesis, the risk of peri-implant bone damage. Teeth lose induce a bone quality degradation that could cause the implantation failure. Two implant geometries have been tested for different bone qualities during clenching. In the first case, the classical implants, frequently employed by dentists, have been used. In the second case, the advantages of the newly patented implant, composed of a vertical and horizontal screws, have been tested

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Ferreira, José Joaquim da Rocha. "Mandibular rehabilitation: study of alternative concepts for implant-supported mandibular prosthesis." Doctoral thesis, 2018. https://hdl.handle.net/10216/115721.

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Ferreira, José Joaquim da Rocha. "Mandibular rehabilitation: study of alternative concepts for implant-supported mandibular prosthesis." Tese, 2002. https://repositorio-aberto.up.pt/handle/10216/115721.

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Arvier, J. F. (John Frederick). "Biocompatability of the Bosker Transmandibular Implant : components of the system in a short-term animal trial." 1987. http://web4.library.adelaide.edu.au/theses/09DM/09dma795.pdf.

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Halimi-Guardiola, Jérôme Mickael. "Prótese total removível mandibular com quatro mini implantes: revisão narrativa." Master's thesis, 2019. http://hdl.handle.net/10284/8835.

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Hoje, a implantologia é uma disciplina importante em nossa prática odontológica. Graças à pesquisa e seus avanços espetaculares, que tornaram seu uso cada vez menos restritivo, tornou-se essencial em nossos planos de tratamento. No entanto, ainda existem situações clínicas que a implantologia convencional não consegue responder. Desde o consenso de Mcgill, a prótese mandibular total removível implantada deve ser o tratamento de escolha para superar os problemas de instabilidade. Devido ao seu pequeno diâmetro, os mini-implantes são uma alternativa interessante. Aparecidos na década de 1970, os mini-implantes foram inicialmente projetados para uso temporário, a fim de superar os problemas de tempo encontrados durante o período de osseointegração de implantes de longa duração. Seguindo as observações de clínicos que utilizaram mini-implantes transitórios que relataram dificuldades, ou às vezes quase impossibilidade, removê-los após vários meses, os mini-implantes poderiam ser considerados como tratamento de longo prazo. Eles tornaram possível estender as indicações de uma prótese removível completa supra-implantar para pacientes que não podem ser tratados com dois implantes sinfisários de diâmetro padrão sem enxerto ósseo prévio. De facto, a colocação de quatro mini-implantes como suportes de prótese mandibular removível total está particularmente indicada no doente idoso, em quem é geralmente preferível um tratamento rápido e relativamente simples. No entanto, é necessário continuar os estudos e aumentar o acompanhamento clínico, a fim de especificar a taxa de sobrevida que parece ser inferior aos implantes convencionais. Today, implantology is an important discipline in our dental practice. Thanks to the research and its spectacular advances, which made its use increasingly less restrictive, it has become essential in our treatment plans. However, there are still clinical situations that conventional implantology can not respond to. Since the Mcgill consensus, implanted total removable mandibular prosthesis should be the main treatment to overcome problems of instability. Because of their small diameter, mini-implants are an interesting alternative. Appearing in the 1970s, mini-implants were initially designed for temporary use in order to overcome the time problems encountered during the osseointegration period of long-term implants. Following the observations of practitioners using transient mini-implants who reported difficulties, or sometimes almost impossibility, to record them after several months, mini-implants could be considered as long-term treatment. They have made it possible to extend the indications of a complete supra-implant removable prosthesis for patients who can not be treated with two standard-diameter sinfisal implants without previous bone graft. In fact, four mini implant placement as mandibular support of total re-movable mandibular prosthesis is particularly indicated in the elderly patient, in whom rapid and relatively simple treatment is generally preferable. However, it is necessary to continue studies and increase clinical follow-up in order to specify the survival rate that appears to be lower than conventional implants.

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Alesawy, Aminah. "Within-subject comparison of two- versus three-implant-assisted mandibular overdenture : patient-based outcomes." Thèse, 2018. http://hdl.handle.net/1866/21349.

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SHIH-CHIEH, CHANG, and 張仕杰. "STRESS ANALYSIS OF FIXED PROSTHESES ON MANDIBULAR TILTED ABUTMENT." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/54722232212226177792.

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碩士 高雄醫學院 牙醫學研究所 87 The purpose of this study was to evaluate the stress distributions to the abutments of a fixed partial denture with tilted molar abutments. In cases of the lower first molar being missing, photoelastic models were made with 3-unit fixed partial dentures of which the second molars were tilted 0 degrees, 10 degrees, 20 degrees, 30 degrees, and 40 degrees mesially towards the occlusal surface. A vertical load of 79.0 Newton was applied distally to the pontic 9mm from the marginal ridge of the second premolar. Quasi-3D photoelastic stress analysis was used, and the stresses were recorded photographically. The quasi-3D technique of photoelastic stress analysis method was used to evaluate the stress of mandibular posterior fixed partial dentures (FPD) with mandibular second molar mesio-tipping. The points located at 5 mm directly below the root apexes and at 3mm away from the roots were chosen as the "standard points". The "material fringe value" is introduced into the definition of the "stress concentration index" by multiplying the fringe orders. And the fringe orders were counted with a null-balance compensator. Five photoelastic models were compared quantitatively by determining the stress concentration. From the isochromatic patterns and the Id values, a fourfold increase in stress in the artificial bone at the mesial aspect of the terminal abutment was observed when the load to the long axis was altered from 0 degrees to 30 degrees. The photoelastic models showed that the variation in the stress concentration index also increased directly with inclination, and incrementally increased from 30 degrees to 40 degrees. In the models studied, it should be emphasized that a mandibular posterior fixed partial denture being placed with terminal abutment tilted more than 30 degrees must be critically evaluated.

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Audy, Nicholas. "La survie implantaire suite à une réhabilitation par mise en charge immédiate d’une prothèse totale mandibulaire reliée à deux implants non jumelés : une étude pilote expérimentale." Thèse, 2013. http://hdl.handle.net/1866/10077.

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Problématique : Les connaissances théoriques et pratiques au sujet de la mise en charge immédiate d’implants non jumelés chez les édentés sont limitées. Objectifs : Cette étude avait pour but de : (1) déterminer le taux de survie implantaire de 2 implants non jumelés supportant une prothèse totale mandibulaire suite à une mise en charge immédiate, (2) évaluer les changements des niveaux osseux et de stabilité implantaire survenus sur ces 2 implants durant une période de 4 mois et les comparer à un implant témoin, et (3) décrire les complications cliniques associées à ce mode de mise en charge. Méthodologie : Chez 18 individus édentés (âge moyen de 62±7 ans), cette étude de phase I avec un design pré/post a évalué les résultats cliniques suivant la mise en charge immédiate (<48 heures) de 2 implants non jumelés par une prothèse totale mandibulaire. À l’aide de radiographies périapicales, de sondages osseux et d’analyses de la fréquence en résonnance, les niveaux osseux péri-implantaires (en mm) et les niveaux de stabilité implantairte (en ISQ) de ces 2 implants insérés dans la région parasymphysaire ont été évalués à la chirurgie (T0) et au suivi de 4 mois (T1). Un implant non submergé et sans mise en charge inséré dans la région de la symphyse mandibulaire a été utilisé comme témoin. Les données ont été analysées avec des modèles mixtes linéaires, la méthode de Tukey ajustée, l’analyse de variance de Friedman et des tests de rang signés de Wilcoxon. Résultats : De T0 à T1, 3 implants mis en charge immédiatement ont échoué chez 2 patients. Le taux de survie implantaire obtenu était donc de 91,7% (33/36) et, par patient, de 88,9% (16/18). Aucun implant témoin n’a échoué. Les changements osseux documentés radiologiquement et par sondage autour des implants mis en charge immédiatement étaient, respectivement, de -0,2 ± 0,3 mm et de -0,5 ± 0,6 mm. Les pertes d’os de support implantaire n’ont pas été démontrées statistiquement différentes entre les implants avec mise en charge immédiate et les témoins. Les niveaux moyens de stabilité implantaire ont augmenté de 5 ISQ indépendamment de la mise en charge. Les niveaux moyens d’ISQ n’ont pas été démontrés statistiquement différents entre les implants avec mise en charge immédiate et les témoins à T0 ou T1. Cinq des 18 patients n’ont expérimenté aucune complication clinique, alors que 9 en ont eu au moins deux. Hormis les échecs implantaires, aucune de ces complications n’a entraîné de changements au protocole. Conclusion : Les résultats à court terme suggèrent que : (1) le taux de survie implantaire suite au protocole immédiat est similaire à ceux rapportés lors d’un protocole de mise en charge conventionnel (2) les changements d’os de support implantaire et de stabilité ne sont pas différents comparativement à ceux d’un implant témoin, (3) un niveau élevé d’expérience clinique et chirurgicale est requis pour effectuer les procédures et pour gérer les complications associées. Ces résultats préliminaires devraient être confirmés dans une étude clinique de phase II. Problem: There is a theoretical and practice knowledge gap in regard to immediate loading of unsplinted implants in edentulous individuals. Objectives: This study aimed to: (1) determine the implant survival rate of 2 unsplinted implants supporting a mandibular complete overdenture following an immediate loading protocol, (2) assess marginal bone level and implant stability changes of these immediately loaded implants in a 4-month period and compared them to a control implant, and (3) describe the clinical complications associated with this mode of loading. Methods: In 18 edentate individuals (mean age 62±7 years), this phase-I trial with a pre/post design assessed the clinical outcomes following the immediate loading (<48 hours) of 2 unsplinted implants supporting a mandibular overdenture. Periapical radiograhs, bone probing measurements and resonance frequency analysis were used to assess marginal bone losses and implant stability changes of these two implants inserted in the mandibular parasymphyseal region, at baseline (T0) and 4-month follow-up (T1). A non-submerged and non-loaded implant inserted in the mandibular symphysis was used as a control. Data were analyzed using linear mixed models, adjusted Tukey tests, Friedman’s analysis of variance and Wilcoxon signed-ranks tests. Results: From T0 to T1, 3 immediately loaded implants failed in 2 patients. This resulted in an implant survival rate of 91.7% (33/36), and, per patient, of 88.9% (16/18). No control implant failed. The marginal bone losses around loaded implants were -0.2 ± 0.3 mm for radiographic measurements and -0.5 ± 0.6 mm for probing measurements. There was no statistically significant difference between immediately loaded and control implants in regard to the supporting marginal bone losses. The implant stability levels increased of 5 ISQ units regardless of loading. There was no statistically significant difference in the mean ISQ levels between immediately loaded and control implants at T0 or T1. Five out of 18 patients experienced no clinical complication, while 9 of them had at least two. Apart from implant failures, none of these clinical complications led to changes in the protocol. Conclusion: The short-term results suggest that: (1) the implant survival rate following the immediate protocol is similar to those reported during a conventional loading protocol, (2) marginal implant supporting bone and stability changes are not different compared to those of a control implant, (3) a high level of clinical and surgical experience is required to perform the procedures and to manage the associated complications. These preliminary results should be confirmed in a phase II clinical trial.

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Tang, Ling. "A within-subject comparison of mandibular long-bar and hybrid implant-supported prostheses." 1988. http://catalog.hathitrust.org/api/volumes/oclc/48133986.html.

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Su, Cheng-yu, and 蘇政于. "Adjacent Implant-Supported Prostheses Type in Posterior Mandibular:a Finite element analysis." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/8k2r9u.

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碩士 國立臺灣科技大學 醫學工程研究所 99 For the adjacent implant prostheses type. Most studies have advocated the theory of splinting implant prostheses, but don’t have clinical evidence. Therefore, the purpose of this study is to investigate the stress distribution of different prostheses types in implants and cortical bone. The distribution of stress can be obtained by applying the same loading to any position in clinically indicated with various coefficient of friction and interference. Then, the values of implants and cortical bone are used as a reference to make the prostheses type in clinical 　　There are three different conditions that can reduce the equivalent stress without splinting the prostheses, which are application of bite force to the mesio-marginal ridge, an increase the coefficient of friction, and no interference. In addition, when the prostheses interference is increase, the implants and cortical bone equivalent stress also increase. Even if the interference is insignificant, the resulting lateral stress is significantly. When prostheses are splinting, exerting the bite force at the mesio-marginal ridge causes all implants and cortical bone to minimum equivalent stress. Furthermore, the implants and cortical bone equivalent stress in two different prostheses type. The splinting prostheses type is the best way to reduce implants and cortical bone equivalent stress. 　　In conclusion, splinting the prosthesis can effectively reduce the equivalent stress of the implant and cortical bone as well as the risk of fatigue fracture of the bone resorption around the implant.

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Ku, Ya-Chin, and 辜雅勤. "Effect of implant-supported fixed prostheses on mandibular deformation during opening movement― Finite element analysis." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/35894281694680277035.

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碩士 臺北醫學大學 牙醫學系碩博士班 97 Clinical findings indicated that the geometrical shape of the mandible was deformed during mouth opening. This deformation results in a reduction in the width of the mandibular arch. According to the rigid connection of dental implant and bone tissue, some authors indicated that edentulous mandible treated with implants supported fixed partial denture and connected by a one piece cross-arch superstructure could generate dangerous stresses both at bone-implant interface and prostheses superstructure, and high stress concentration might lead to failure of the osseointegration and the fracture or loosening of the prostheses. In this study, a finite element method was used to evaluate the effect of different types of implant supported fixed partial dentures on the mandibular deformation. The mandible model with natural dentition and five mandible models with implants and prostheses were developed. Five mandible models treated with : only eight implants and eight implants connected by one, two, three and four-piece superstructures. Additionally, the same forces and orientations of masticatory muscles were considered to simulate opening movement in this study. Then, the stress distribution of the prostheses and implants in different designs of implant-supported prostheses were analyzed for discussion. Our results demonstrated that the mandible models with natural dentition and implants presented a decrease in mandibular arch during opening. The changes in width between the mandibular molar area in the mandible model with natural dentition and the mandible model treated with eight implants but not connected by superstructure were 0.212 mm and 0.249 mm, and the dimensional changes were decreased from the posterior to the anterior area, and these results conform to the clinical studies. We also found that, stress concentrated at the symphyseal area of superstructure during opening movement, and separating the superstructure at the symphyseal area will decrease the stress concentration of implant prostheses. In comparison with one-piece cross arch superstructure, two, three and four sections of the superstructure will decrease the stress of implant prostheses. During opening movement, stresses were concentrated at the implant-bone interface close to the implant neck. Especially the most distal implant in the mandible model treated with a one- piece cross arch superstructure, and implants connected with four-unit superstructure present stress concentration more equally. The results indicated that the mandibular deformation and the stress concentration on implant-bone surface and prostheses are related to the different superstructure designs of implant supported fixed partial dentures. Therefore, we suggest that, the dentists should pay more attention to prostheses design on implant supported prostheses in edentulous mandible.

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Silva, Ana Margarida Verde Pereira Ramos da. "Processamento por impressão 3D de próteses totais mandibulares." Master's thesis, 2020. http://hdl.handle.net/10316/93986.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia Este trabalho pretende conjugar uma bordagem multidisciplinar ao incorporar duas áreas científicas distintas: a Engenharia Mecânica e a Medicina Dentária. O objetivo principal era avaliar a viabilidade de processar por fabricação aditiva, utilizando a tecnologia normalmente designada por impressão 3D, próteses totais mandibulares, utilizando diferentes materiais poliméricos. Deste modo pretendia-se estudar a substituição dos materiais cerâmicos atualmente utilizados por alternativas mais baratas, de maior facilidade de fabrico e cujas tecnologias envolvidas fossem mais sustentáveis do ponto de vista ambiental.O estudo foi iniciado pela caracterização química, térmica e mecânica dos filamentos de ABS, HIPS e PMMA. Após estudos preliminares para otimização dos parâmetros de impressão foram impressos provetes para a avaliação das propriedades mecânicas, nomeadamente da resistência ao impacto. A etapa seguinte consistiu na impressão das arcadas dentárias superiores e inferiores e avaliação macroscópica das mesmas. Quando comparadas com outras obtidas por fresagem e fabricação aditiva a partir de pós de polímero, as desenvolvidas no presente trabalho mostram um acabamento superior, apesar de a qualidade de impressão selecionada para o seu processamento ter sido a qualidade normal (altura de camada de 0,1 mm) e não a de elevada qualidade (altura de camada de 0,05 mm). O trabalho ficaria concluído pela avaliação do comportamento mecânico das próteses híbridas (arcadas com os implantes metálicos) em testes à compressão. Esta avaliação seria efetuada antes e após estudos de envelhecimento em saliva artificial. Esta última etapa não foi possível de ser efetuada devido aos constrangimentos impostos pela pandemia designada COVID-19. This work aims to combine a multidisciplinary approach by incorporating two distinct scientific areas: Mechanical Engineering and Dentistry. The main objective was to evaluate the feasibility of processing by additive manufacturing, using the technology normally called 3D printing, mandibular total prostheses, using different polymeric materials. In this way it was intended to study the replacement of the ceramic materials currently used by cheaper alternatives, which are easier to manufacture and whose technologies involved were more sustainable from an environmental point of view.The study was initiated by the chemical, thermal and mechanical characterization of the ABS, HIPS and PMMA filaments. After preliminary studies to optimize the printing parameters, test pieces were printed for the evaluation of the mechanical properties, namely the impact resistance. The next step consisted of printing the upper and lower dental arches and macroscopic evaluation of them. When compared with others obtained by milling and additive manufacturing from polymer powders, those developed in the present work show a superior finish, although the print quality selected for processing was normal quality (layer height 0, 1 mm) and not high quality (layer height 0.05 mm). The work would be concluded by the evaluation of the mechanical behavior of hybrid prostheses (arches with metallic implants) in compression tests. This evaluation would be carried out before and after studies of aging in artificial saliva. This last step was not possible due to the constraints imposed by the pandemic designated as COVID-19.

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Huang, Sheng-Ni, and 黃聖霓. "Biomechanical Evaluation of 3D Printed Titanium Reconstruction/Prosthetic Framework for Mandibular Segmental Osteotomy Defect－Finite Element Analysis." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3we227.

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碩士 中國醫藥大學 牙醫學系碩士班 106 Research background In recent years, with the popularization of 3D CT scanning and the development of 3D printing technology, it is increasingly popular for using titanium plates in the surgery for patients. Oral cancer ranks 5th in cause of cancer death, with a mortality rate of 12.48 per 100,000 people and ranks fourth in male cancer deaths. Face is important when people communicate face-to-face. However, after the surgery of mandibular excision for oral cancer, facial repair and restoration of chewing function are the goals of every clinician, therefore, how to repair the mandibular segmental defect is an important issue and is worth to be investigated. Materials and methods This study used an artificial mandible with anatomical shape and obtains its computed tomography (CT) image files. After importing those images into the medical imaging software, the specially designed 3D model of printed titanium prosthetic framework with mandibular anatomical shape were created. The analyzed parameters in the models of the 3D titanium mandibular prosthetic framework are as follows: 1. Two different surgical design, include: (1) the prosthesis retaining the residual mandibular bone (mild oral cancer patients) and (2) the prosthesis with complete mandibular resection (severe oral cancer patients); 2. Two different lengths of mandibular prosthesis: 20 mm and 25 mm; 3. Three different thickness of mandibular prosthesis: 0.8mm, 1mm and 1.5 mm. On the basis of the above three kinds of design parameters, a total of 12 groups of 3D model, were then put in to the finite element (FE) software for the simulation. A bite force of 100 newtons at a 45-degree angle from the lingual side to the buccal side was applied as loading condition, and the highest value and distribution of von-Mises stresses of the 3D model of printed scaffold and peripheral bone of the mandible were investigated. Results In the results of the two different surgical designs, whether the prosthesis retaining the residual bone or with complete mandibular resection, the high stresses of the prosthesis are concentrated at the two locations, one is on the junction of the lower edge of the dental-abutment column and another is on the left wing of the prosthesis. Compared with those two designs, the prosthesis retaining the residual mandibular bone has the highest stresses in the prosthesis and cortical bone. With the prosthesis model of thickness of 0.8 mm and length of 20 mm as an example, the peak stresses on the prosthesis and cortical bone in the design of the prosthesis with complete mandibular resection are 43.79 MPa and 10.51 MPa; however, the peak stresses in the design of the prosthesis retaining the residual mandibular bone are even higher, the stresses on the prosthesis and cortical bone are 46.83 MPa and 11.79 MPa. In the results of two lengths of prostheses, using prosthesis with the thickness of 0.8 mm as an example, the peak stress under lower edge of the dental-abutment column with the 25 mm of prosthesis length at is higher (compared with the 2.0mm of prosthesis length) (46.68 MPa vs. 38 MPa), but at the left wing of the prosthesis, the prosthesis stress with the length of 20 mm is higher (compared with the length of 25 mm) (46.83 MPa vs. 41.1 MPa). In the results of cortical bone stress, the model with 20 mm length of prosthesis bears more stress than that with 25 mm of length of prosthesis. Observing the models with 20 mm length of prosthesis retaining the residual mandibular bone as an example, the prosthesis stresses with thickness at 0.8 mm, 1 mm, 1.5 mm were 46.83 MPa, 42.47 MPa, 38.32 MPa, respectively, while the cortical bone stress were 11.79 MPa, 12.02 MPa, 13.37 MPa, correspondingly. Observing the models of 20 mm length of prosthesis with complete mandibular resection as an example, the peak prosthesis stresses with thickness of 0.8mm, 1mm and 1.5mm were 43.79 MPa, 32.69 MPa and 31.35 MPa, respectively, but the peak cortical bone stresses were 10.51 MPa, 11.29 MPa and 12.16 MPa, individually. Conclusion In this study, it was found that under two different surgical designs, the stresses of prosthesis and cortical bone in the model of the prosthesis retaining the residual mandibular bone is higher as compared with the model of the prosthesis with complete mandibular resection. In the results related to prosthesis length, there is no fixed trend of prosthesis stress, but stress in the cortical bone is relatively high at the prosthesis length of 20 mm as compared with that of 25 mm. Both designs show that as the thickness of the prosthesis is decreasing, the stress in the prosthesis is decreasing also, but the stress in cortical bone is increasing. The results of in this study is still need to be confirmed in future clinical report. Keywords: mandibular resection of oral cancer, mandibular segmental defect, 3D printed titanium mandibular prosthetic framework, the prosthesis retaining the residual mandibular bone, the prosthesis with complete mandibular resection, the prosthesis length, the prosthesis thickness, finite element analysis

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Nascimento, Ruben Figueiredo do. "Análise estrutural de diferentes mecanismos de retenção para próteses totais mandibulares implanto-suportadas." Master's thesis, 2021. http://hdl.handle.net/10316/96208.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia Objetivo: Um dos tratamentos para a reabilitação protética de um paciente é a prótese total removível ou Overdentures, constituído por: implantes ligados através de uma barra rígida, fixando a prótese através de clipes. A principal desvantagem deste sistema é que os clipes geralmente são metálicos e exigem trabalho do laboratório sempre que fraturam, ou perdem a retenção, provocando elevadas implicações financeiras. Posto isto, o objetivo deste projeto é o planeamento de um sistema de retenção fiável e de boa manutibilidade, constituído por dois implantes, uma barra, um clipe e um Housing. A barra une os dois implantes com uma geometria experimental. Os clipes são alojados num Housing para serem facilmente substituíveis.Materiais e Métodos: O estudo tem uma parte numérica e uma parte experimental. Inicialmente, na parte numérica, projetou-se o conjunto (barra, clipe, Housing) no Autodesk Inventor Professional 2021, para posteriormente importar no ADINA AUI 9.7. Analisando as vantagens e desvantagens, de todas as geometrias modeladas e o seu comportamento à mastigação foi possível definir uma geometria, para posterior otimização. De seguida, foram realizadas várias simulações da inserção/remoção da prótese, com o intuito de atingir o valor de força pretendido e perceber as modificações necessárias. Como os materiais utilizados (TPU, Nylon) têm um módulo de elasticidade de uma ordem de grandeza diferente foi realizada uma otimização, para materiais com menor módulo e outra para materiais com maior módulo.Na parte experimental, fabricou-se um bloco de espuma rígida de poliuretano, para simular o osso cortical. De seguida, foram colocados dois implantes da Straumann, centrados na largura e comprimento do bloco, com distância entre centros de 16 mm. Colocou-se um pilar aparafusado em cada implante, para posteriormente ser possível fixar a barra, através de dois parafusos oclusais. A barra, de liga Cr-Co, foi fresada na máquina DENTAL Concept Systems-DC7. Posteriormente, produziram-se os 3 clipes numa impressora 3D laser, denominada por NextDent 5100. Por fim, obtiveram-se os dois modelos de Housing por fundição. De forma a perceber a influência da interferência e do comprimento dos lábios do clipe foram criados 3 grupos de estudo. Todos os grupos de estudo utilizam a barra fabricada com geometria experimental e o Housing de flexão, diferenciando-se pelo clipe utilizado. Por isso, são definidos e identificados pelo nome do clipe: Grupo1-Clipe Curto; Grupo2-Clipe longo; Grupo3-Clipe longo com interferência. Para analisar os diferentes grupos foram elaborados 3 protocolos: inserção/remoção, mastigação e combinado (inserção/remoção e mastigação). Resultados: Na parte numérica, com as geometrias do conjunto otimizadas, obteve-se com o clipe de TPU uma força de inserção de -4,57 N e de remoção de 3,43 N. Com o clipe em Nylon obteve-se -69,6 N na inserção e 44,6 N na remoção. Na parte experimental, no ensaio de inserção/remoção com saliva, a taxa de crescimento da força apresentada pelo grupo 1 foi de 22%, pelo grupo 2 4,82% e o grupo 3 não cresceu. No final do ensaio, o grupo1 apresentou uma força de retenção de 1,2 N/mm, o grupo 2 1,52 N/mm e o grupo 3 0,98 N/mm. No ensaio de mastigação verificou-se que os ciclos de mastigação tinham influência na fratura dos lábios do clipe. No ensaio combinado, o clipe do grupo1 fraturou ao ciclo 95 e no grupo2 fraturou ao ciclo 4. Conclusões: Apesar dos materiais utilizados na parte experimental não coincidirem com a parte numérica (por falta de precisão geométrica da impressão por filamento), o estudo numérico foi fundamental para a perceção de conceitos, definição e otimização da geometria. A parte experimental serviu como complemento do estudo numérico e prova do conceito idealizado. As forças de inserção/remoção dependem, essencialmente, dos seguintes fatores: material e interferência geométrica do clipe, atrito entre os componentes e comprimento do sistema de retenção. Conclui-se que quanto maior o módulo de elasticidade do material, a interferência e o atrito, maior é a retenção e que a forma do Housing afeta a retenção do clipe. Para materiais com maior módulo de elasticidade deve-se utilizar um Housing curto, para os lábios do clipe estarem à flexão. Para materiais com um módulo de elasticidade menor deve-se utilizar um Housing longo, para os lábios do clipe estarem à compressão. Para o clipe deve ser utilizado um material com elevado limite de elasticidade, resistência à fadiga e elevada tenacidade à fratura. Objective: One of the treatments for the prosthetic rehabilitation of a patient is a total removable denture or Overdentures, consisting of implants connected through a rigid bar, fastening a prosthesis using clips. The main disadvantage of this system is that those are metallic and need laboratory work whenever they fracture, or lose retention, causing certain expensive financial costs. Therefore, the objective of this project is the elaboration of a retention system, consisting of two implants, a bar, a clip, and housing. The bar joins the two implants with an experimental geometry. The clips are placed in Housing for easy replacement.Materials and Methods: The study has a numerical part and an experimental part. Initially, in the numerical part, the set was designed (bar, clip, Housing) in Autodesk Inventor Professional 2021, to later import into ADINA AUI 9.7. Analyzing the advantages and disadvantages of all modelled geometries and their chewing behaviour, it was possible to define a geometry for further optimization. Then, several simulations of the insertion/removal of the prosthesis were carried out, in order to reach the desired force value and realize the necessary changes. As the materials used (TPU, Nylon) have an elastic modulus of a different order of magnitude, optimization was carried out for materials with lower modulus and another for materials with a higher modulus.In the experimental part, a block of rigid polyurethane foam was manufactured to simulate the cortical bone. Then, two Straumann implants were placed, centered on the width and length of the block, with a distance between centers of 16 mm. A screwed abutment was placed in each implant so that the bar could be fixed later using two occlusal screws. The bar, made of Cr-Co alloy, was milled on the DENTAL Concept Systems-DC7 machine. Subsequently, the 3 clips were produced in a 3D laser printer, called NextDent 5100. Finally, the two housing models were obtained by foundry. To understand the influence of interference and the length of the clip's lips, 3 study groups were created. All study groups use the bar manufactured with experimental geometry and the flexion housing, differing by the clip used. Therefore, they are defined and identified by the name of the clip: Group1- Short Clip; Group2-Long Clip; Group3-long clip with interference. To analyze the different groups, 3 protocols were created: insertion/removal, chewing and combined (insertion/removal and chewing).Results: In the numerical part, with the set geometries optimized, an insertion force of -4.57 N was obtained as well as a removal force of 3.43 N with the TPU clip. With the Nylon clip, an insertion force of -69.6 N was obtained as well as a removal force of 44.6N.In the experimental part, in the insertion/removal test with saliva, the rate of strength growth presented by group 1 was 22%, by group 2 was 4.82% and group 3 did not grow. At the end of the test, group 1 had a holding force of 1.2 N/mm, group 2 of 1.52 N/mm, and group 3 0.98 N/mm. In the chewing test, it was verified that the chewing cycles had an influence on the fracture of the clip's lips. In the combined trial, the clip in group1 fractured at cycle 95 and in group2 it fractured at cycle 4.Conclusions: Although the materials used in the experimental part don´t coincide with the numerical part (due to the lack of geometric precision of the filament printing), the numerical study was fundamental for the perception of concepts, definition, and optimization of the geometry. The experimental part served as a complement to the numerical study and proof of the idealized concept. Insertion/removal forces depend essentially on the following factors: material and geometric interference of the clip, friction between components, and length of the retention system; The greater the material's modulus of elasticity, interference, and friction, the greater the retention and that the Housing shape affects clip retention system. The conclusion is that for materials with a higher modulus of elasticity, a short housing should be used, so that the clip lips are flexing. For materials with a lower modulus of elasticity, a long Housing must be used, so that the clip lips are in compression; For the clip, a material with a high elasticity limit, fatigue resistance, and high fracture tenacity must be used.

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Jesus, Jorge Alexandre Almeida. "Desenvolvimento de mecanismos de retenção para próteses totais mandibulares implanto-suportadas." Master's thesis, 2020. http://hdl.handle.net/10316/94015.

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Dissertação de Mestrado Integrado em Engenharia Mecânica apresentada à Faculdade de Ciências e Tecnologia Objetivo: O principal objetivo deste projeto é a avaliação e comparação da capacidade retentiva de diferentes sistemas de attachment utilizados em overdentures mandibulares sobre 2 implantes. As variáveis do estudo são as secções transversais das barras utilizadas: Hader, Dolder oval e uma secção experimental (elaborada no decorrer deste projeto) e a adição de extensões distais às barras, sendo que todos os grupos de estudo estarão associados a clipes em poliéter-éter-cetona (PEEK). Outro objetivo é a avaliação da influência das secções transversais dos attachments e da adição de cantilevers nas tensões a nível dos componentes dos sistemas de retenção em estudo. Materiais e métodos: Inicialmente foi elaborado um protótipo mandibular constituído por 2 materiais, a parte cortical foi obtida em politereftalato de etileno reforçado com fibras de carbono (PET CF Innovatefil®) (Smart Materials 3D, Jaén, Espanha) e a parte trabecular em resina de poliuretano Smooth-cast 320® (Smooth-On Inc, Macungie, EUA); Após a obtenção deste protótipo foram colocados dois implantes Tissue Level Standard Plus Implants Ø3.3mm RN, SLActive®, Roxolid® (Straumann, Basileia, Suíça) na região intermentoniana. Foram ainda obtidos 2 suportes, constituídos politereftalato de etileno reforçado com fibras de carbono (PET CF Innovatefil®).De seguida foram obtidos os attachments em barra com secções transversais de Hader, Dolder oval e uma secção experimental em liga Cromo-Cobalto Zfx™ Rawdens Cobalt Chromium Eco Zimmer (Zfx GmbH, Dachau, Alemanha), sendo que para cada tipo de secção foi obtida uma barra com e sem extensões distais, totalizando 6 diferentes barras. Os clipes correspondentes às secções transversais em estudo foram, numa primeira instância, obtidos em polimetilmetacrilato (PMMA) (Treed Filaments, Itália), no entanto, o objetivo final é a fabricação destes em PEEK. Posteriormente foram obtidas próteses em resina acrílica transparente ProBase Cold (Ivoclar Vivadent, Schaan, Liechtenstein), às quais foi adicionado silicone Gingifast Elastic (Zhermack SpA. Badia Polesine RO, Itália). Finalmente os materiais obtidos foram recriados no software ADINA AUI versão 9.5.3 (ADINA R&D Inc., Massachusetts, EUA) e efetuadas análises de tensões e deformações, com o objetivo de avaliar a influência da secção transversal e da adição de cantilevers, na distribuição de tensões e deformações dos componentes dos sistemas de attachment. Resultados: As barras de secção experimental induziram maiores tensões a nível dos componentes dos sistemas de retenção, com e sem cantilevers.A adição de extensões distais aumentou as tensões a nível das barras e dos restantes componentes. No entanto, comparativamente com os attachments sem cantilevers, permitiram uma redução das tensões a nível da mucosa e osso cortical na região posterior, à exceção do osso cortical da secção de Dolder. Conclusões: Secções transversais mais rígidas aumentam as tensões a nível do sistema de retenção; A resistência à rotação da prótese a nível anterior e a adição de cantilevers levam a um aumento das tensões a nível do sistema de retenção, no entanto, reduzem os esforços transmitidos a nível da mucosa e osso cortical na região posterior. Objective: The main objective of this study is to evaluate and compare the retention capacity of different splinted attachment systems used on mandibular overdentures over 2 implants. The study variables are the bars cross-section: Hader, Dolder “egg-shape” and experimental (cross section designed during this project) and the addiction of cantilevers to the bars. All groups are associated to clips made in polyether-ether-ketone (PEEK). Another objective is to assess the influence of cross-sections and the addition of cantilevers on the stress values of the attachment system components under study. Materials and methods: Initially, a mandibular prototype made by 2 materials was developed, the cortical bone was obtained in polyethylene terephthalate reinforced with carbon fibers (PET CF Innovatefil®) (Smart Materials 3D, Jaén, Spain) and the trabecular bone in polyurethane resin Smooth-cast 320® (Smooth-On Inc, Macungie, EUA). After obtaining the prototype, two Tissue Level Standard Plus Implants Ø3.3mm RN, SLActive®, Roxolid® implants (Straumann, Basel, Switzerland) were placed in the intermentonian region. Two supports were also made in polyethylene terephthalate reinforced with carbon fibers (PET CF Innovatefil®).The attachment systems bars with Hader, Dolder “egg-shape” and experimental cross-sections were developed and obtained in cobalt-chromium alloy - Zfx™ Rawdens Cobalt Chromium Eco Zimmer (Zfx GmbH, Dachau, Germany). For each cross-section, 2 bars were obtained, with and without cantilevers, totalizing 6 different bars. The corresponding clips were, in first instance, obtained in polymethylmethacrylate (PMMA) (Treed Filaments, Italy). However, the final objective is to manufacture these in PEEK.Subsequently, prostheses were prepared in ProBase Cold transparent acrylic resin (Ivoclar Vivadent, Schaan, Liechtenstein), and Gingifast Elastic (Zhermack SpA, Badia Polesine RO, Italy) silicone was added to their bases.Finally, the collected materials were recreated in ADINA AUI version 9.5.3 software (ADINA R&D Inc., Massachusetts, USA) and stress and strain analyzes were performed to evaluate the influence of the bar cross section and the addition of cantilevers in the stress and strain distribution of the components of the attachment systems. Results: The experimental cross section bars induced higher stresses at the attachment systems components, with and without cantilevers. The addition of cantilevers increased the stress values at the attachment systems components. However, in comparison with the bars without them, the cantilevers allowed a reduction of the stress values at the mucosa and cortical bone in posterior region, except for the cortical bone of the Dolder cross-section. Conclusions: Stiffer cross-sections increase the stress values at the attachment system; the resistance of the overdenture rotation over the bar and the addition of cantilevers lead to an increase of the stress values at the attachment systems, however, they reduced the efforts at the posterior region mucosa and cortical bone.

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