Dissertations / Theses on the topic 'CAD/CAM'
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Silva, Villarroel Gonzalo. "Cestería CAD/CAM en mimbre." Tesis, Universidad de Chile, 2013. http://www.repositorio.uchile.cl/handle/2250/112826.
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Este proyecto trata, a modo de un proyecto experimental, de una transferencia de conocimiento desde el ámbito digital al área de producción artesanal de objetos. Consiste en el diseño de estructuras personalizables o paramétricas para el tejido en mimbre, que permitan generar objetos modificables y de mayor complejidad morfológica. Resuelve el problema de poco aprovechamiento actual del potencial de creación y conocimiento relacionado con la técnica del tejido en mimbre. Por medio de la forma y ensamble de piezas que, a modo de urdimbre, servirán de base para el tejido realizado por el artesano.
Dhamija, Dinesh. "Macintosh - Bridgeport communications CAD/CAM." Ohio : Ohio University, 1988. http://www.ohiolink.edu/etd/view.cgi?ohiou1182784285.
Full textStawarczyk, Bogna. "Langzeitstabilität von CAD/CAM-Kunststoffen." Diss., Ludwig-Maximilians-Universität München, 2013. http://nbn-resolving.de/urn:nbn:de:bvb:19-161094.
Full textCheikh, Abdelmadjid. "Functional tolerancing in CAD/CAM." Thesis, University of Nottingham, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278691.
Full textMazzoni, Simona <1977>. "Ricostruzione mandibolare con tecnologia CAD-CAM." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5622/1/Mazzoni_Simona_Tesi.pdf.
Full textThis paper describes a new protocol for mandibular reconstruction. CAD/CAM technology was used to manufacture custom-made cutting guides for tumor ablation and reconstructive plates to support fibula free flaps in five patrients presenting oral tumour involving the mandibular bone. CT scan data from the patients were elaborated to produce a virtual surgical plan of mandibular osteotomy in safe tissue for complete ramus/body resection. The CAD/CAM procedure was used to construct a customized surgical device composed of a cutting guide and a titanium reconstructive bone plate. The cutting guide allowed the surgeon to precisely transfer the virtual planned osteotomy into the surgical environment. The bone plate, including in two cases a custom-made anatomical condylar prosthesis, was designed using the outer surface of the healthy side of the mandible to obtain an ideal contour and avoid the bone deformities present on the side affected by the tumor. Operation time was reduced in the demolition and reconstruction phases. Functional and aesthetic outcomes allowed patients to immediately recover their usual appearance and functionality. This new protocol for mandibular reconstruction using CAD/CAM to construct custom-made guides and plates may represent a viable way to reproduce the patient's anatomical contour, give the surgeon better procedural control, and reduce operation time.
Mazzoni, Simona <1977>. "Ricostruzione mandibolare con tecnologia CAD-CAM." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5622/.
Full textThis paper describes a new protocol for mandibular reconstruction. CAD/CAM technology was used to manufacture custom-made cutting guides for tumor ablation and reconstructive plates to support fibula free flaps in five patrients presenting oral tumour involving the mandibular bone. CT scan data from the patients were elaborated to produce a virtual surgical plan of mandibular osteotomy in safe tissue for complete ramus/body resection. The CAD/CAM procedure was used to construct a customized surgical device composed of a cutting guide and a titanium reconstructive bone plate. The cutting guide allowed the surgeon to precisely transfer the virtual planned osteotomy into the surgical environment. The bone plate, including in two cases a custom-made anatomical condylar prosthesis, was designed using the outer surface of the healthy side of the mandible to obtain an ideal contour and avoid the bone deformities present on the side affected by the tumor. Operation time was reduced in the demolition and reconstruction phases. Functional and aesthetic outcomes allowed patients to immediately recover their usual appearance and functionality. This new protocol for mandibular reconstruction using CAD/CAM to construct custom-made guides and plates may represent a viable way to reproduce the patient's anatomical contour, give the surgeon better procedural control, and reduce operation time.
Collin, Andrew (Andrew Paul) Carleton University Dissertation Management Studies. "Factors affecting implementation success of CAD and CAM additions to CAD/CAM systems: operating level personnel's perspective." Ottawa, 1994.
Find full textHalder, Julia. "Marginale Passgenauigkeit CAD/CAM-gefertigter Titan-Kronenkäppchen." Diss., lmu, 2003. http://nbn-resolving.de/urn:nbn:de:bvb:19-12470.
Full text梁振邦 and Chun-bong Leung. "Conversion of features for CAD/CAM integration." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1997. http://hub.hku.hk/bib/B31237290.
Full textMercer, Tim. "CAD/CAM selection for small manufacturing companies." Online version, 2000. http://www.uwstout.edu/lib/thesis/2000/2000mercert.pdf.
Full textLeung, Chun-bong. "Conversion of features for CAD/CAM integration /." Hong Kong : University of Hong Kong, 1997. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19634961.
Full textŠebesta, Vít. "Aplikace CAD/CAM softwaru hyperMILL při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399331.
Full textKuchař, Petr. "Aplikace CAD/CAM softwaru WorkNC při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400955.
Full textSpáčil, Petr. "Aplikace CAD/CAM softwaru PowerMILL při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229289.
Full textFoltán, Petr. "Aplikace CAD/CAM softwaru FeatureCAM při obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-231011.
Full textPaseka, Jan. "Optimalizace NC programu pomocí CAD/CAM software." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231402.
Full textXue, Feng, and 薛峰. "Evolutionary computation of geodesic paths in CAD/CAM." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31226978.
Full textTor, S. B. "Geometric algorithms and data structures for CAD/CAM." Thesis, University of Westminster, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356320.
Full textChaharbaghi, H. "Feature based design : integration of CAD and CAM." Thesis, University of Edinburgh, 1992. http://hdl.handle.net/1842/14321.
Full textSantos, Edgar Pereira dos [UNESP]. "CAD/CAM/Usinagem CNC integrado a engenharia reversa." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152068.
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A sociedade sempre busca inovações como facilitadores de processos para o alcance de objetivos propostos em distintas áreas, utilizando instrumentos, métodos e técnicas diversas. Dentre estas encontra-se a Engenharia Reversa (ER), que é o processo de engenharia afim de se obter um produto ou objeto a partir de um modelo original. Nos últimos anos, com a rápida evolução tecnológica , envolvendo máquinas, ferramentas e softwares, a ER passou a ser um recurso utilizado até mesmo por pequenas e médias empresas. O proposito desta pesquisa é avaliar o desempenho da aplicação de recursos de engenharia, tais como hardwares e softwares de baixo custo ou de uso livre, sobre a ER a fim de obter-se uma peça usinada em uma maquina CNC o mais fiel possível ao modelo físico original. Para isso foram aplicados os conceitos, os processos e recursos necessários nas etapas de reconstrução de um modelo físico , desde a digitalização 3D, utilizando scanners tridimensionais, o tratamento do objeto capturado, a reconstrução do modelo no software CAD até a geração do código G, por meio de softwares CAM, a ser enviado a uma máquina CNC para realização da usinagem e obtenção da peça modelo. Foi utilizado o scanner 3d manual Ciclop, cuja digitalização resultou em dimensões muitas próximas ao objeto original. Também foram utilizados os softwares Meshlab para tratamento do modelo digitalizado e o AutoCad Fusion 3D para criação do modelo CAD e geração dos processos de usinagem e código G, escolhidos devido a facilidade de uso e por serem softwares livres.
Society is always looking for innovations as process facilitators for the objectives in different areas, using tools, and various techniques. Among these is the Reverse Engineering (RE), which is the engineering process in order to obtain a product or object from a original model. In recent years, with the rapid technological evolution, involving machines, tools and software, ER has become a resource used until even by small and medium-sized enterprises. The purpose of this research is to evaluate the performance of engineering resources, such as hardware and software. low cost or free-use software on the RE in order to obtain a part machined in a CNC machine as faithful as possible to the original physical model. For applied the concepts, processes and resources required in the steps reconstruction of a physical model, since 3D scanning, using scanners dimensionality, the treatment of the captured object, the reconstruction of the model in the CAD software to the generation of the G code, through CAM software, to be sent to a CNC machine to perform the machining and obtain the model part. Was the Ciclop 3d manual scanner, whose many close to the original object. Meshlab softwares were also used for handling the scanned model and AutoCad Fusion 3D for creating the model and generation of the machining processes and G code, chosen due to ease of use and because they are free software.
Santos, Edgar Pereira dos. "CAD/CAM/Usinagem CNC integrado a engenharia reversa /." Ilha Solteira, 2017. http://hdl.handle.net/11449/152068.
Full textResumo: A sociedade sempre busca inovações como facilitadores de processos para o alcance de objetivos propostos em distintas áreas, utilizando instrumentos, métodos e técnicas diversas. Dentre estas encontra-se a Engenharia Reversa (ER), que é o processo de engenharia afim de se obter um produto ou objeto a partir de um modelo original. Nos últimos anos, com a rápida evolução tecnológica , envolvendo máquinas, ferramentas e softwares, a ER passou a ser um recurso utilizado até mesmo por pequenas e médias empresas. O proposito desta pesquisa é avaliar o desempenho da aplicação de recursos de engenharia, tais como hardwares e softwares de baixo custo ou de uso livre, sobre a ER a fim de obter-se uma peça usinada em uma maquina CNC o mais fiel possível ao modelo físico original. Para isso foram aplicados os conceitos, os processos e recursos necessários nas etapas de reconstrução de um modelo físico , desde a digitalização 3D, utilizando scanners tridimensionais, o tratamento do objeto capturado, a reconstrução do modelo no software CAD até a geração do código G, por meio de softwares CAM, a ser enviado a uma máquina CNC para realização da usinagem e obtenção da peça modelo. Foi utilizado o scanner 3d manual Ciclop, cuja digitalização resultou em dimensões muitas próximas ao objeto original. Também foram utilizados os softwares Meshlab para tratamento do modelo digitalizado e o AutoCad Fusion 3D para criação do modelo CAD e geração dos processos de usinagem e código G, escolhidos devid... (Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Apxiпов, М. М. "Використання CAD/CAM систем в проєктуванні електроерозійної обробки." Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/22676.
Full textРобота присвячена програмуванню електроерозійної обробки в середовищі програмних продуктів компанії AutoDesk. Показано на конкретному прикладі, що для виробництва прес-форм для виготовлення пластмасових виробів використо-вується як остаточна – електроерозійна обробка. Створюється 3-D модель пласт-масового виробу, прес-форми, електрода. Моделюється процес електроерозійної обробки.
Xue, Feng. "Evolutionary computation of geodesic paths in CAD/CAM /." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23457429.
Full textLise, Diogo Pedrollo. "Cimentação adesiva de materiais CAD/CAM resina-cerâmica." reponame:Repositório Institucional da UFSC, 2015. https://repositorio.ufsc.br/xmlui/handle/123456789/169633.
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Objetivos: Avaliar o efeito de diferentes tratamentos de superfície e do tempo de armazenamento na resistência de união adesiva à microtração (µTBS) de blocos CAD/CAM do tipo resina-cerâmica. Materiais e Métodos: Dois tipos de blocos CAD/CAM resina-cerâmica (Cerasmart, GC e Enamic, Vita Zahnfabrik) foram seccionados em fatias com 4 mm de espessura, distribuídos em seis grupos e submetidos aos seguintes tratamentos de superfície: Grupo 1: sem tratamento; Grupo 2: jateamento com óxido de alumínio 27 µm + silano; Grupo 3: condicionamento com ácido hidrofluorídrico 5% por 60 seg + silano; Grupo4: condicionamento com ácido fosfórico 37% por 60 seg + silano; Grupo 5: jateamento; Grupo 6: jateamento + silano. Pares de fatias do mesmo material e grupo foram cimentadas umas às outras (n=3 espécimes sanduíches/grupo) utilizando um cimento resinoso dual autoadesivo para os grupos 1 ao 5, e uma resina fluida fotopolimerizável para o grupo 6. Após respectivamente três semanas e 6 meses de armazenamento em cloramina 0,5% à 37oC, os espécimes sanduíches foram seccionados em micro espécimes retangulares, desgastados na interface adesiva (forma de ampulheta) e submetidos ao teste de µTBS. Os dados foram estatisticamente analisados por um modelo linear de efeitos mistos considerando como fatores o tipo de material, o tratamento de superfície e o tempo de armazenamento, assim como suas interações de primeiro grau(p=0,05). Resultados: Independente do tratamento de superfície e tempo de armazenamento, os dois materiais resina-cerâmica apresentaram valores deµTBS sem diferença estatística. Após 3 semanas, todos os grupos obtiveram valores similares. Depois de 6 meses, os valores de resistência adesiva foram mantidos quando foi realizado o JAT com óxido de alumínio (Grupo 263) ou o condicionamento com HF (Grupo 5), ambos seguidos por silanização. O JAT seguido de silanização e o uso de uma resina fluida como agente cimentante também manteve a µTBS. A ausência de tratamento superficial (Grupo 1), o JAT isolado (Grupo 2) e o condicionamento com H3PO4 seguido de silanização (Grupo 6) resultaram em uma diminuição da µTBS. Conclusões: ambos materiais do tipo resina-cerâmica demonstraram µTBS similar, independente do tratamento de superfície. A criação de uma superfície microrretentiva através do JAT com óxido de alumínio ou condicionamento com HF, seguido de silanização, é necessária para manutenção resistência de união adesiva após 6 meses.
Objectives: To evaluate the effect of different surface treatments on the bond strength to resin-ceramic CAD/CAM blocks after six months. Materials and Methods: Two types of resin-ceramic CAD/CAM blocks (Cerasmart, GC; Enamic, Vita Zahnfabrik) were cut in slabs of 4-mm thickness, divided into six groups and subjected to the following surface treatments: Group 1: No treatment; Group 2: Sandblasting (SB); Group 3: SB + Silane; Group 4: SB + Silane; Group 5: 5% Hydrofluoric acid (HF) etching + Silane; Group 6: 37% Phosphoric acid (H3PO4) etching + Silane. Sections of the same group were luted together (n=3 sandwich specimens/group) using a dual-cure self-adhesive cement for all groups, except for Group 4 that were luted using a flowable light-curing composite. After three weeks of storage in 0.5% chloramine at 37oC, the sandwich specimens were sectioned in rectangular micro-specimens and trimmed to an hourglass shape. Part of the specimens was subjected to a micro-tensile bond strength (µTBS) test and the other half was tested after 6 months of storage. Data were statistically analyzed with a linear mixed effects model for the factors surface treatment, material type and storage period, together with their first-degree interactions (p=0.05). Results: The lowest bond strengths were obtained in the absence of any surface treatment (Group 1), while the highest bond strengths were obtained when the surface was roughened by either SB or HF etching, this in combination with chemical adhesion through silanization. Loss in bond strength was observed after six months when either surface roughening or silanization, or both, were omitted. Conclusions: Both resin-ceramic CAD/CAM blocks appeared equally bonding-receptive regardless of the surface treatment. Creating a microretentive surface by either SB or HF etching, followed by chemical adhesion using a silane coupling agent is mandatory to maintain the bond strength after six months.
Kadlecová, Hana. "Aplikace CAD/CAM technologie pro vytvoření loga společnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230849.
Full textRamos, Carla Müller. "Propriedades mecânicas e caracterização intrínseca de zircônia experimental para uso em sistemas CAD/CAM." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25148/tde-03092013-155032/.
Full textThe aim of this study was to evaluate the mechanical properties and the intrinsic characteristics of an experimental yttrium tetragonal zirconia partially stabilized (Y-TZP) compared the other three Y-TZPs commercially available starting block for CAD/CAM system. The groups were: Experimental Zirconia (ZE), Zirconcad (ZCA), IPS e.max ZirCad (ZMAX) and In Ceram YZ (ZYZ). Flexural strength: 120 specimens were constructed for each group (n=30) and subjected to bending test at three points crosshead speed of 0.5mm/min, according to ISO 6872. ANOVA test was used to analyze significant differences between groups (α=0.05). To characterize the strength and longevity of the materials, the Weibull statistical analysis by two parameters were used: the Weibull modulus (m) and the characteristic strength (δ0). Fractographic analyzes: the fracture surface of the specimens was analyzed by scanning electron microscope (SEM) and the size of the critical defect (c) and fracture toughness (KIC) was estimated by quantitative fractographic analysis and characterization through qualitative analysis. Micro Raman spectroscopy: phases of crystalline structures of different Y-TZP were identified by detecting the characteristic bands. Statistically significant (p <0.05) in flexural strength between ZCA, which had the lowest values compared with ZE, ZMAX and ZYZ, which in turn were similar. The fractured surfaces of all specimens showed similar fractographics characteristics and values of fracture toughness for ZE were significant difference only for ZCA. All materials showed the characteristic bands of tetragonal and monoclinic phases of zirconia. ZE were similar in its mechanical properties and intrinsic, which suggests that material capable of being used for the system CAD/CAM and applied clinically as framework.
Sguizzardi, Silvio. "Modelando o futuro: a evolução do uso de tecnologias digitais no desenvolvimento de projetos de arquitetura." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/16/16132/tde-26012012-153604/.
Full textWith the history of the graphic computation technological development and its influence on the architect\'s professional activity as the starting point, the present research addresses the creative and productive processes of contemporary architecture. Based on the project analysis as a way of explaining the problem being presented, three projects developed at different times along this evolution are presented as case studies: the Sydney Opera House, Australia; the H2Oexpo Pavilion in the island of Neeltje Jans, Netherlands; the Mercedes-Benz Museum in Stuttgart, Germany. By using a critical analysis we try to understand the relations in the use of computers in the development and building of these projects. The analysis of each case included the techniques that were used, the benefits obtained and innovations provided, as well as the difficulties, limitations and challenges that were faced from the very beginning of the project development until the building was constructed. In order to better understand the wealth and diversity of the theme, the collection of documents, bibliography and statements and positioning of the professionals involved were used to obtain a full and objective reading of the object. The present work was designed to bring a contribution to understand this relation, cooperating with the study of project issues related to the new media, as a way to establish a knowledge foundation to reflect on the use of graphic computation tools in the architectural universe.
Bao, Zhuojun. "Rechnerunterstützte Kollisionsprüfung auf der Basis eines B-rep/Polytree/CSG-Hybridmodells in einem integrierten CAD/CAM-System /." Düsseldorf : VDI-Verl, 2000. http://www.gbv.de/dms/bs/toc/319988562.pdf.
Full textThornton, Ian. "Mechanical properties of dental resin composite CAD/CAM blocks." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/48603.
Full textDentistry, Faculty of
Graduate
黃啓榮 and Kai-wing Wong. "A CAD/CAM system for sheet metal blanking dies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B31210594.
Full textAlmustafa, Nawaf Mohammed. "The use of CAD CAM for fixed partial prostheses." Thesis, University of Dundee, 2016. https://discovery.dundee.ac.uk/en/studentTheses/7185f4c0-4f47-4072-8b0a-7ae09c1e8c01.
Full textAllen, Richard David. "An agent-based approach to STEP-NC CAD/CAM." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/33612.
Full textБорисов, М. О., П. О. Баєв, and О. Г. Аврунін. "Застосування CAD-CAM технології при виготовленні корсетів при сколіозі." Thesis, ХНУРЕ, 2019. http://openarchive.nure.ua/handle/document/8551.
Full textWong, Kai-wing. "A CAD/CAM system for sheet metal blanking dies /." [Hong Kong : University of Hong Kong], 1991. http://sunzi.lib.hku.hk/hkuto/record.jsp?B13204841.
Full textLoehr, Birte [Verfasser], and Petra [Akademischer Betreuer] Gierthmühlen. "Monolithische CAD/CAM-Glaskeramik: Bruchlastergebnisse glasierter versus polierter Molarenkronen." Freiburg : Universität, 2019. http://d-nb.info/1216826455/34.
Full textVinkler, Tomáš. "Aplikace CAD/CAM softwaru PowerMILL 6.0 při 3D obrábění." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228540.
Full textKafka, Lukáš. "Využití CAD/CAM technologie pro výrobu formy čerpadlového kola." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229137.
Full textRuebel, Michael Alexander Marcus Johannes [Verfasser], and Petra [Akademischer Betreuer] Gierthmühlen. "Einfluss der Schichtstärke von CAD/CAM gefertigten hybridkeramischen Molarenkronen auf die maximale Bruchlast nach Kausimulation im Vergleich zu monolithischen CAD/CAM gefertigten Zirkonoxidkronen." Freiburg : Universität, 2018. http://d-nb.info/1163200816/34.
Full textCarvalho, Adriana Oliveira 1981. "Influence of restorative material and technique on the mechanical performance of indirect restorations of endodontically treated molars or not = Influência do material e técnica restauradora na performance mecânica de coroas indiretas sobre molares tratados endodonticamente ou não." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287831.
Full textTese (Doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Objetivos: Comparar a resistência à fadiga (RFAD) e à fratura (RFRA), o modo de falha e o desgaste do antagonista em contato com os diferentes designs de coroas CAD/CAM utilizadas para restaurar molares tratados endodonticamente/TE ou não, fabricadas em cerâmica feldspática/FEL, dissilicato de lítio/DL ou resina nano cerâmica/RNC e fixadas com cimento resinoso auto-adesivo. Materiais e Métodos: Para os capítulos um e dois, 90 molares foram preparados e restaurados com coroas com espessura de 1,5mm ou 0,7mm respectivamente, em FEL, DL ou RNC. Para os capítulos três e quatro, outros 90 molares tiveram a porção coronária removida (nível da junção cemento-esmalte), foram TE e restaurados utilizando três diferentes designs de núcleo de preenchimento em resina composta/NPRC (4-mm de altura, 2-mm ou sem núcleo de preenchimento/endocrown) associados a coroas em RNC ou DL respectivamente. Para o capítulo cinco, grupos dos capítulos um (RNC/1,5mm e DL/1,5mm), três (NPRC de 4-mm de altura/RNC) e quatro (NPRC de 4-mm de altura/DL) foram combinados. Todas as coroas do estudo foram confeccionadas pelo sistema CAD/CAM Cerec 3 e cimentadas com o cimento RelyX Unicem II Automix. As coroas em FEL e DL foram previamente condicionadas com ácido fluorídrico e silanizadas. As coroas em RNC, assim como os dentes preparados foram apenas jateados. Todas as restaurações foram submetidas ao teste de RFAD com um carregamento cíclico isométrico aplicado por uma esfera de resina composta. O carregamento começou com cargas de 200N (5.000x) seguidos por estágios de 400, 600, 800, 1000, 1200 e 1400N a um máximo de 30.000 ciclos cada. Os espécimes foram submetidos ao carregamento até a fratura ou por no máximo 185.000 ciclos. Os espécimes que resistiram a todos os ciclos foram novamente testados axialmente até a falha ou até uma carga máxima de 4.500N. Os espécimes foram classificados quanto ao modo de falha em: catastrófica, possivelmente reparável e reparável. Os grupos foram comparados utilizando uma análise de sobrevida para o teste de RFAD e t-test ou ANOVA para o teste de RFRA. Comparações Post hoc também foram utilizadas para comparar os diferentes grupos. Resultados: A taxa de sobrevida das coroas sobre os molares não TE foram: 80% (RNC/1,5mm), 6,6% (RNC/0,7mm), 93,3% (DL/1,5mm), 13,2% (DL/0,7mm), 6,6% (FEL/1,5mm) e 0% (FEL/0,7mm). A RFRA das coroas com 1,5mm de espessura foi: 3122N-RNC, 3237N-DL e 2500N-FEL. As coroas cimentadas sobre molares TE tiveram taxa de sobrevida e RFRA respectivamente de: 53%/2969N (RNC-4mm de altura), 100%/3181N (DL-4mm de altura), 87%/2794N (RNC-2mm de altura), 93%/3759N (DL-2mm de altura), 87%/2606N (RNC-endocrown) e 100%/3265N (DL-endocrown). No teste de RFAD houve falha catastrófica apenas para as coroas confeccionadas em RNC-4mm. Após o teste de RFRA todos os espécimes falharam catastroficamente. As coroas em RNC induziram menor desgaste aparente ao antagonista. Conclusão: Apenas as coroas FEL-0,7mm não sobreviveram além da máxima força mastigatória humana. Para os dentes não TE, as coroas em DL e RNC com espessuras de 1,5mm tiveram o melhor desempenho mecânico. Para os molares TE, uma maior carga para fratura foi requerida com o uso de coroas em DL-2mm. O tratamento endodontico não teve influência sobre a RFAD de molares restaurados com coroas CAD/CAM de DL, mas diminuiu a performance das RNC
Abstract: Objectives: To evaluate the fatigue resistance, load-to-failure, failure mode and antagonistic wear in contact with different designs of full CAD/CAM crowns made of feldspathic ceramic/FEL, lithium disilicate/LD or resin nano ceramic/RNC. These prosthetic materials were used to restore endodontic treated molars or not, using a simplified cementation process. Materials and Methods: Chapters One and Two used 90 molars, which had a standardization of full crown preparation and teeth were restored using crown made of FEL, LD and RNC with thickness of 1.5mm or 0.7mm, respectively. Chapters Three and Four used 90 molars decoronated at the level of CEJ, endodontically-treated and restored using three different Filtek Z100 adhesive core build-ups designs (4-mm-build-up; 2-mm-build-up; and no buildup/ endocrown preparation) combined to crowns made of RNC and LD, respectively. For Chapter Five, groups of Chapters One (RNC/1,5mm and LD/1,5mm), Three (4-mm-build-up/RNC) and Four (4-mm-build-up/LD) were combined. All molars were restored using the Cerec 3 CAD/CAM system and cemented with RelyX Unicem II Automix cement. FEL and LD restorations were conditioned by hydrofluoric acid etching and silanated. RNC restorations as well as all preparations were treated only with airborne-particle abrasion. All restorations were submitted to cyclic isometric loading applied through a composite resin hemi-sphere. The cyclic loading started with a load of 200N (x5000 cycles), followed by stages of 400, 600, 800, 1000, 1200, and 1400N at a maximum of 30,000 cycles each. Specimens were loaded until failure or for a maximum of 185,000 cycles. Survived specimens were axially loaded until failure or to a maximum load of 4,500N. After load tests, the specimens were analyzed for the failure mode: "catastrophic" tooth/root failure, "possibly reparable" failure and "reparable" failure. Groups were compared using the life table survival analysis (fatigue test) and the t-test, one-way or two-way ANOVA for the survived samples loaded to failure. Pairwise post hoc comparisons were used to compare the different groups. Results: The survival rates for the vital teeth were: 80% (RNC - 1.5mm), 6.6% (RNC - 0.7mm), 93.3% (LD - 1.5mm), 13.2% (LD - 0.7mm), 6.6% (FEL - 1.5mm) and 0% (FEL - 0.7mm). Post-fatigue load-to-failure for 1.5mm crowns ranged between 3122N (RNC), 3237N (LD) and 2500N (FEL). The survival rate and post-fatigue load to failure for non-vital teeth were 53% / 2969N (4mm - RNC), 100% / 3181N (4mm - DL), 87% / 2794N (2mm - RNC), 93% / 3759N (2mm - DL), 87% / 2606N (endocrown - RNC) e 100% / 3265N (endocrown - LD), respectively. There were only catastrophic failures for 4mm-build-up RNC during the fatigue test. All of specimens in the load-to-failure test exhibited non-restorable catastrophic fractures. Crowns made of RNC seemed to generate the least amount of antagonistic wear. Conclusions: FEL crowns with 0.7mm of thickness didn't survive beyond the maximum masticatory forces. RNC and LD crowns with 1.5mm thick had the best performance on vital teeth. LD crowns combined with short build-ups (2mm) were associated to highest loads to failure. Endodontic treatment did not influence the fatigue resistance of molars restored with LD CAD/CAM complete crowns but decreased the performance of RNC crowns
Doutorado
Materiais Dentarios
Doutora em Materiais Dentários
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Full textFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Objetivo: O objetivo deste estudo foi avaliar a adaptação marginal de infraestruturas de próteses fixas confeccionadas pelo Sistema CAD/CAM com três diferentes sistemas de aquisição de dados. Material e Métodos: Confeccionaram-se 50 corpos de prova; Convencional (Ni-Cr) (n = 10), GI: iTero (n = 10), GII: CerecBluecam/fresadora industrial (n = 10), GIII: 3S (n = 10) e GIV: CerecBlueCam/Sirona (n = 10). Os corpos de prova foram numerados e randomizados, realizou-se análise da desadaptação marginal vertical. Resultados: A análise intra observador indicou que não houve diferença estatisticamente significante (teste t pareado, p = 0.822) no período antes e depois das análises. O sistema convencional (321 ?m) apresentou maior desadaptação quando comparado com o sistema CAD/CAM (89 ?m) (p<0.001). O sistema intra oral (iTero) apresentou menor índice de desadaptação marginal, quando comparado com o sistema extra oral (3S), (p<0.001). O sistema aberto apresentou maior índice de desadaptação marginal (114 ?m) quando comparado com intra oral (iTero), sendo p<0.001. Além disto, no sistema convencional, observou-se que os pré-molares apresentaram índice de desadaptação maior quando comparado (361 ?m) com o molar (283 ?m) (p<0.001), porém no sistema CAD/CAM não houve diferença estatisticamente significante na comparação de dentes pré-molares (93,7 ?m) e molares (84,9 ?m). Significância: O sistema CAD/CAM pode atuar mais favoravelmente, reduzindo o índice de desadaptação marginal, quando comparado com o sistema convencional de confecção de próteses dentárias. O sistema intra oral (iTero) comportou-se melhor quando comparado com os demais sistemas.
Objective: The aim of this study was to evaluate the marginal fit of frameworks produced by CAD/CAM systems with three different data acquisition. Material and Methods: We fabricated 50 frameworks: conventional (Ni-Cr) (n = 10), GI:iTero (n = 10), GII:CerecBluecam/industrial milling (n = 10), GIII:3S (n = 10), and GIV:CerecBlueCam/Sirona (n = 10). We numbered the specimens and analyzed them randomly. Results: Intra-observer analysis indicated no statistically significant difference (paired t-test, p = 0.822) before and after the analysis. The conventional system (321 ?m) showed greater misfit than the CAD/CAM (89 ?m) (p<0.001) system. The intraoral system (iTero) showed a lower rate of marginal misfit than the extra-oral system (3S), (p<0.001). The open system presented a higher marginal discrepancy (114 ?m) than intraoral (iTero), with p<0.001. Moreover, in the conventional system, premolars (361 ?m) showed a higher index of misfit than molars (283 ?m) (p<0.001), but for the CAD/CAM system, there was no statistically significant difference between premolars (93.7 ?m) and molars (84.9 ?m). Significance: The CAD/CAM system can to act more favorably reducing the rate of marginal discrepancy than the conventional impression system of dental prosthesis. The intra oral system (iTero) was better than other systems.
FAPESP: 11/06311-5
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