Dissertations / Theses on the topic 'Dental restorative composites'
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Adusei, Gabriel Opoku. "Development of novel organophosphorus based dental restorative materials." Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289857.
Full textMikhail, Sarah Shawky. "Optical Properties of Two Brands of Composite Restorative Materials and Confirmation of Theoretical Predictions for Layering." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1316436113.
Full textChadwick, R. D. "The durability of restorative materials." Thesis, University of Newcastle Upon Tyne, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383980.
Full textWang, Guigui. "Perfluorotriethylene glycol dimethacrylate modified composite resins for improved dental restoratives." The Ohio State University, 1998. http://catalog.hathitrust.org/api/volumes/oclc/47350511.html.
Full textSunnegårdh-Grönberg, Karin. "Calcium aluminate cement as dental restorative : Mechanical properties and clinical durability." Doctoral thesis, Umeå universitet, Tandhygienistprogrammet, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-270.
Full textSunnegårdh-Grönberg, Karin. "Calcium aluminate cement as dental restorative : mechanical properties and clinical durability /." Umeå : Univ, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-270.
Full textCheung, Big-chu Gloria. "An in vitro study of selected mechanical properties and surface profiles of some p̀osterior' composite resin restorative materials." Click to view the E-thesis via HKUTO, 1987. http://sunzi.lib.hku.hk/HKUTO/record/B38628259.
Full text張碧珠 and Big-chu Gloria Cheung. "An in vitro study of selected mechanical properties and surface profiles of some ��posterior' composite resin restorative materials." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B38628259.
Full textSousa, Rosane Pontes de. "Anticariogenic in situ effect of different restorative dental materials." Universidade Federal do CearÃ, 2008. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=1358.
Full textTooth structure immediately adjacent to restorations is susceptible to secondary caries, which may be caused by imperfect adaptation of restorative materials and subsequent microorganism colonization. Therefore, in order to identify methods of preventing secondary caries and increasing clinical dental restoration durability, different restorative dental materials have been introduced and applied in dental clinics. Thus, this in situ study assessed the effects of different restorative materials on the microbiological composition of dental biofilm and evaluated their ability of protecting the adjacent enamel against acid attacks from bacterial activity. A double-blind, split-mouth design was performed in one phase of 14 days, during which, 20 volunteers wore intra-oral palatal devices with five human enamel slabs, which were extra-orally restored according to the manufacturerâs specifications, using one of the following materials: Filtek Z 250/Single Bond composite resin; Permite amalgam; Fuji II encapsulated resin-modified glass ionomer; Vitremer resin-modified glass ionomer and Ketac Molar conventional glass ionomer.. During the experimental period, all subjects used fluoride-containing dentifrice 3x/day and a 20% sucrose solution was dripped onto the slabs 8x/day in predetermined times. The biofilm formed on the slabs was analyzed to determine total and mutans streptococci as well as lactobacilli counts. Demineralization (delta S) was determined on enamel by cross-sectional microhardness at 20 and 70 -Âm from the restoration margin. In order to verify the differences among the treatments, Kruskal-Wallis and ANOVA followed by Minimum Squares test were applied for cariogenic microbiota and delta S, respectivly. No statistically significant differences were found in the cariogenic microbiota grown on the slabs. At 20-Âm distance, only Fuji II statistically differed from the other groups presenting the lowest demineralization. At 70-Âm, Fuji II significantly inhibited demineralization when compared to Permite, Filtek-Z-250 and Ketac Molar. Concluding, in the background of fluoride dentifrice and under the cariogenic exposure condition of this study, only the encapsulated resin-modified glass ionomer material provided additional protection against secondary caries.
A estrutura dentÃria imediatamente adjacente a restauraÃÃes à suscetÃvel ao surgimento de cÃrie secundÃria, que pode ocorrer devido a imperfeiÃÃes na adaptaÃÃo de materiais restauradores e subseqÃente colonizaÃÃo por microrganismos. Logo, com o objetivo de identificar os mÃtodos de prevenÃÃo da cÃrie secundÃria e aumentar a longevidade das restauraÃÃes, diferentes materiais restauradores tÃm sido introduzidos e usados na clÃnica odontolÃgica. Desta forma, este estudo in situ avaliou os efeitos de diferentes materiais restauradores na composiÃÃo microbiolÃgica do biofilme dental bem como a habilidade destes materiais em proteger o esmalte adjacente dos ataques Ãcidos provenientes da atividade bacteriana. Foi empregado um delineamento duplo-cego, âsplit-mouthâ realizado em uma fase de 14 dias, durante a qual, 20 voluntÃrios utilizaram dispositivos intra-orais palatinos com cinco blocos de esmalte dental humano que foram restaurados extra-oralmente, de acordo com as recomendaÃÃes do fabricante com um dos seguintes materiais: Resina composta Filtek Z250/Single Bond (grupo controle), AmÃlgama Permite, IonÃmero de vidro modificado por resina encapsulado Fuji II, IonÃmero de vidro modificado por resina Vitremer e IonÃmero de vidro convencional Ketac Molar. Durante o perÃodo experimental, os voluntÃrios utilizaram dentifrÃcio fluoretado, 3 vezes ao dia e gotejaram sobre os blocos, uma soluÃÃo de sacarose a 20%, 8 vezes ao dia em horÃrios prÃ-determinados. No 14o dia, o biofilme formado sobre os blocos foi removido para determinar a contagem de estreptococos totais e estreptococos mutans, bem como lactobacilos. A desmineralizaÃÃo (delta S) ao redor da restauraÃÃo foi avaliada atravÃs da anÃlise de microdureza em corte longitudinal do esmalte a 20 e 70 Âm da margem da restauraÃÃo. Para detectar as diferenÃas entre os tratamentos, foram aplicados os testes Kruskal-Wallis e ANOVA seguida do teste dos quadrados mÃnimos para a microbiota cariogÃnica e delta S, respectivamente. NÃo foram encontradas diferenÃas estatisticamente significativas na microbiota cariogÃnica formada sobre os blocos. Na distÃncia 20 Âm, somente o Fuji II diferiu estatisticamente dos outros grupos apresentando a menor desmineralizaÃÃo. A 70 Âm, o Fuji II inibiu significativamente a desmineralizaÃÃo quando comparado ao Permite, Filtek-Z-250 e Ketac Molar. Conclui-se que na situaÃÃo de uso de dentÃfricio flouretado associada ao desafio cariogÃnico do presente estudo, somente, o ionÃmero de vidro modificado por resina encapsulado apresentou uma proteÃÃo adicional contra o desenvolvimento de cÃrie secundÃria
Khan, Abdul Samad. "A novel bioactive nano-composite : synthesis and characterisation with potential use as dental restorative material." Thesis, Queen Mary, University of London, 2009. http://qmro.qmul.ac.uk/xmlui/handle/123456789/441.
Full textTeitelbaum, Heather K. Walker Mary P. "Effects of simulated functional loading conditions on dentin, composite, and laminate structures." Diss., UMK access, 2007.
Find full text"A dissertation in oral biology and engineering." Advisor: Mary P. Walker. Typescript. Vita. Title from "catalog record" of the print edition Description based on contents viewed July 30, 2008. Includes bibliographical references (leaves 110-126). Online version of the print edition.
Azzam, Mai Ahmed. "Flexural strength comparison of monolayer resin composite to bilayer resin/ liner composite." Thesis, Connect to resource online, 2009. http://hdl.handle.net/1805/2077.
Full textTitle from PDF t. p. (viewed Feb. 5, 2010) Advisor(s): Jeffrey A. Platt, Chair of the Research Committee, Joseph Legan, Carl J. Andres, David Brown, Burak Taskonak . Curriculum vitae. Includes abstract. Includes bibliographical references (leaves 45-52).
Franzon, Renata. "Eficácia da remoção parcial de tecido cariado em dentes decíduos : ensaio clínico controlado randomizado." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/143682.
Full textPartial caries removal in deep carious lesions of primary teeth has been demonstrated excellent clinical, radiographs and microbiological results. However, the clinical performance of composite resin restorations placed over the demineralized dentin need more information. The objective of this work was to investigate the restoration performance over carious tissue trough a literature systematic review and a randomized controlled clinical trial. Methods: Fifty-one children aged from 3 to 8 years old (28 boys and 23 girls) with, at least, one molar with deep carious lesion were included in this clinical trial. The teeth were randomly divided according to the following treatments: Control group - total caries removal (TCR); and Test - partial caries removal (PCR). In case of pulp exposure during dentinal excavation, pulpotomy was performed. Three Pediatric Dentist made the procedures that were followed-up by 3, 6, 12, 18 and 24 months. All procedures were performed under local anesthesia and rubber dam isolation. At the beginning and right after the procedure the children reported their anxiety through two scales: Venham Picture Test (VPT) and Facial Image Scale (FIS). The children behavior during the attendance was valued through Sarnat scale. During the time course follow-up clinical and radiographic aspects of the treatments were evaluated and the restorations analyzed by a calibrated and blinded examiner through modified USPHS. To determine the clinical and radiographic outcomes of composite restorations the groups were statistically analyzed using Kaplan-Meier survival followed by Log Rank. The distribution of cooperatives and non-cooperatives subjects in accordance with different independent variables as well as FIS and VENHAM comparisons between the tree treatments were availed using Qui-square test. Results: The final sample was comprised by forty-eight children and 120 teeth. Among all the analyzed variables, only the time spent for the procedure significantly affected the children behavior (p=0.018) The total caries removal procedure produced 15 pulp exposures (27.5%), while the same event occurred only in one case for the PCR group (2%). The clinical- radiographic success rate after PCR and TCR were 92% and 98%, respectively (p=0.14). It was observed a tendency to lower clinical-radiographic success rate in oclusoproximal cavities (92%) in comparison with oclusal (100%) but without statistic significance (p=0.08). The restorations survival rate was 66%, 85% and 92% to PCR, TCR and pulpotomy groups, respectively after 24 months follow-up (p=0.09). When the restorations survival rate was evaluated in accordance with type of treatment and the type of cavity was observed a significant lower survival rate (p=0.007) to oclusoproximal restoration after PCR (52%). On the other hand, the highest restorations survival was observed in oclusal cavities with partial caries removal (95%). The literature review shows that success rate increases with the decrease of involved surface at the restoration, thus class I restorations presented around 90% of success and it decreases below to 50% if more than one surface are restored. Conclusions: The composite resin restorations placed over caries tissue need shorter follow-up time to evaluate the necessity of being repaired or replaced.
Manni, Hassan. "An in vitro study of post-restorative bleaching : effect on microleakage." Thesis, University of the Western Cape, 2010. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_1776_1307617941.
Full textAim and Objectives: To assess the effect of bleaching on the marginal integrity of Class V composite resin restorations. To determine the effect of a 6% hydrogen peroxide over the counter and a 38% hydrogen peroxide in-office vital bleaching treatment products on the microleakage of Class V composite restorations.
Luo, Yan, and 羅琰. "Assessment of a glass polyalkenoate cement and a polyacid-modified resin composite for the restoration of posterior teeth." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31242121.
Full textLuo, Yan. "Assessment of a glass polyalkenoate cement and a polyacid-modified resin composite for the restoration of posterior teeth." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B22242879.
Full textWu, Wen-Chou. "In vitro compressive fracture resistance of the human maxillary first premolar with different mod cavity design and restorative materials." Thesis, Birmingham, Ala. : University of Alabama at Birmingham, 2007. https://www.mhsl.uab.edu/dt/2007m/wu.pdf.
Full textBanomyong, Danuchit. "Effects of glass-ionomer cement lining on sealing ability and postoperative tooth sensitivity after resin composite restoration of posterior teeth /." Connect to thesis, 2009. http://repository.unimelb.edu.au/10187/3533.
Full textGuimarães, Lizandra Ferrari. "Avaliação da performance de restaurações de resina compota após remoção seletiva de tecido cariado em dentes decíduos : uma análise de microtomografia computadorizada." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/147160.
Full textSelective caries removal (SCR) allows a more conservative approach in restorative treatment of primary teeth for treatment of deep dentin carious lesion, minimizing the risk of pulp exposure and preserving more tooth structure. A few studies described the survival of composite restorations in SCR suggesting a different performance of restorations compared to total caries removal (TCR) restorations. In one of these studies, the clinical success of adhesive restorations for SCR, in oclusoproximais cavities, was significantly lower when compared to TCR. However, occlusal cavities had similar success rates for both techniques (Franzon et al, 2015). The aim of this study was to investigate the adhesive restorations in deciduous teeth exfoliated from the clinical study above. This randomized controlled clinical trial evaluated the clinical performance of adhesive resin composite restorations after SCR and TCR in primary teeth, with a 5-year follow-up. For the present study, these restorations were first evaluated clinically and after exfoliation of the teeth, and macroscopically using digital photography. In addition, the teeth were scanned by an X-Ray Microtomography (Micro-CT) and the pictures reconstructed by device-specific software. After a five years follow-up, twenty teeth were collected and analyzed (15 RSTC and 5 RTTC). The average permanence of these teeth in the oral cavity was 35 months. The composite resin restorations involved oclusoproximal cavities in 80% of the sample (n = 16). The magnification of the image through photography brought no additional information in relation to the visual clinical diagnosis of the restorations on the occlusal surface. As for the oclusoproximais, due to the possibility of direct clinical exam to the surface, seven restorations were classified as failures. With regard to these, most of the failures observed in restorations after exfoliation were related to adhesive discontinuity in the proximal box and adjacent caries restoration (cervical and proximal walls). In the images obtained through the Micro-CT these flaws are evident, materializing communication of the pulp cavity wall with the external environment. In cross-sections images, we observed that the adaptation of the restorations is poorer the closer the cervical portion of the cavity. The same pattern of adhesive failure of proximal restorations after exfoliation was observed for both treatments (SCR and TCR). In the occlusal restorations, we observed good sealing of the restorations, even in the presence of demineralized dentin in the side walls of the cavity. The clinical data of this study, associated with macroscopic visual analysis and Micro-CT of primary teeth exfoliated, demonstrate that technique in oclusoproximal restorations in this teeth is extremely sensitive, and those failure may negatively affect the clinical success of adhesive restorations, compromising the sealing the cavity located near the pulp, which could interfere with the essence of the treatment of selective removal of caries, which is an adequate marginal seal of the cavity associated with the control of carious activity of the patient involved.
Cação, Daniela Maria Ferreira. "Considerações estéticas de dentes endodonciados." Master's thesis, [s.n.], 2015. http://hdl.handle.net/10284/5268.
Full textIntrodução: A restauração de dentes que sofreram tratamento endodôntico é um dos assuntos que mais controvérsia gera em Medicina Dentária. Facto este, devido à vasta quantidade de soluções existentes, que tornam mais difícil a escolha do plano de tratamento mais adequado, que tenha os máximos benefícios funcionais, biológicos e estéticos. Objetivo: Demonstrar, de uma forma muito sucinta as várias modalidades existentes para restauração de dentes endodonciados, nomeadamente as suas indicações, vantagens e desvantagens e o seu prognóstico, e, por outro lado, mostrar soluções para resolver problemas extremamente comuns inerentes a este tratamento, tais como, o escurecimento do dente em comparação com os seus adjacentes. Materiais e Métodos: Revisão bibliográfica tendo por base as palavras-chave delineadas e critérios de inclusão e exclusão específicos, com o objetivo de angariar e debater o máximo de informação acerca desta grande controvérsia da Medicina Dentária. Resultados e Conclusões: Existem inúmeras soluções para restaurar dentes endodonticamente tratados. Todas estas apresentam vantagens, desvantagens e indicações bastante específicas. Assim, é de extrema importância ter um profundo conhecimento acerca das mesmas, a fim de escolher a melhor modalidade de tratamento, com os melhores resultados funcionais, biológicos e estéticos. Visto, atualmente, a vertente estética dos tratamentos revela-se equiparadamente importante. Também, é relevante referir que existem soluções para dentes endodonciados que apresentam o problema mais frequente decorrente do tratamento, o escurecimento do dente em comparação com os adjacentes. A fim de solucionar este problema, defende-se o branqueamento interno do dente, que tem vindo a demonstrar ótimos resultados e excelentes prognósticos.
Introduction: The restoration of the teeth that went through endodontic treatment is one of the subjects that generate controversy in Dentistry. This happens because there’s a lot of solutions that make harder choosing the most suitable treatment plan. It has to include the most functional, biological and aesthetic benefits. Objective: To show, briefly, the many existing modalities to endodontic teeth restauration; namely its indications, advantages and disadvantages and its prognosis. On the other hand, to show solutions to solve extremely common problems due to this treatment. An example of this is the tooth darkening in comparison to its adjacent. Materials and Methods: Bibliographic review based on outlined keywords and specific inclusion and exclusion cryteria, with the objective of raising and debating as many information about this huge controversy as possible. Results and Conclusions: There are countless solutions to restore endodontically treated teeth. All of these have advantages, disadvantages and very specific indications. So, it’s really important to have a deep knowledge about them, in order to choose the best treatment modality, with the best functional, biological and aesthetic results. Currently, the aesthetic slope of the treatments is indeed considerable, so it’s also important to refer that there are solutions for endodontic teeth that feature its darkening in comparison to its adjacent (the most frequent disadvantage during the treatment). To solve this problem, it is advocated the internal teeth bleaching, which has been showing great results and excellent prognosis.
Neto, Pedro Turrini. "Influência de técnicas de clareamento dental na microdureza superficial e alteração de cor de resinas compostas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-30062008-134518/.
Full textThe aim of this study was to evaluate the effects of home bleaching (10% carbamide peroxide) and in office bleaching (37% carbamide peroxide) on the color alteration and microhardness of two composite resins (Z250 and Supreme). For this purpose, it was prepared 100 specimens of resin, 60 for microhardness and 40 for color alteration, with 6mm diameter X 2mm thickness. The matrix was filled in a single increment and the resin was light cured for 20s. Specimens were polished after 24 hours with sandpaper #1200 and diamond paste. In this moment, the first color measurements (standard) and also microhardness measurements were realized. After, in the color study specimens were immersed in coffee for a seven days period, subsequently, a second color measurement was realized. Specimens were randomly divided in three groups for microhardness and two groups for color alteration (n=10) according to bleaching treatment. For the office bleaching were realized in 3 sessions with interval of 7 days among them, and every session were realized 3 applications of the bleach agent for 20 min. For the home bleaching, it was done daily applications with 4h duration by 14 days. Specimens were kept in artificial saliva at 37ºC ± 1ºC during intervals between the bleaching proceedings. A new microhardness and color measurements were realized in the end of the bleaching cycle. Data were submitted to ANOVA and Fisher test (p<0.05) and in relation to microhardness showed that Z250 (material), in office bleaching (treatment) and before bleaching (time) presented higher statistically significant values comparing to the others results. For color alteration showed that ΔE and Δb were statistically significant differences for the following factors: material, treatment and interactions, for ΔL values, Z250 presented darker than Supreme. In the comparison of bleaching with the standard values, it was not observed statistically significant difference between ΔE e ΔL for all factors; however, it was observed significant difference to Δa and Δb for the factors material and treatment. It can be concluded that both methods of bleaching were efficient in brightness specimens to values near from standard. Furthermore, in office bleaching was more effective without change materials micro hardness and Supreme presented better behavior than Z250 in relation to return to initial color.
Kenshima, Silvia. ""Estudo da interface adesiva em restaurações que combinam resinas com diferentes módulos de elasticidade"." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/23/23140/tde-17042002-135335/.
Full textThe objective of this study was to evaluate the quality of the adhesive interface of an experimental placement technique, which combines different composite resins, and two conventional techniques used in class V restorations i n bovine teeth. Two composite resins were applied in this study (Z-250 and Durafill VS) with the adhesive system (Single Bond) in 30 cavity preparations made on the labial surface of the teeth (C-factor = 3). So, six restorativ e techniques were applied with 5 samples each: incremental vertical (Z-v e D-v), incremental oblique (Z-o e D-o), and experimental [Z-e and D-e (lining the cavity walls with one of the resins and bulk filling with the other)]. After 24-hour-storage in water (37° C), each specimen was sectioned (LB) generating 4 surfaces for gap assessment that were previously acid etched (phosphoric acid 37% for 3s) and stained (metilene blue 0.5% for 2s). The adhesi ve interface was examined by optic microscopy at 400X and both length (l) and width (w) of gaps were measured (´mü´m). The mean gap widths were calculated by the equation w = ´sigma´ (´c IND.n´ x ´l IND.n´) / ´sigma´ ´c IND. n´ . The results obtained from the data's statistical analysis (ANOVA for Repeated Measurements) showed that only Technique and Surface were significant (p < 0,05). Based in this results it was concluded that the experimental techni que showed the worst interface quality, which means that gap widths were larger and that the gap width means of the central section were higher than the measured external ones
Atbayga, Abdalla Mohammed Ali. "In vitro anti-bacterial activity of titanium oxide nano-composites containing benzalkonium chloride and chlorhexidine gluconate." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1460.
Full textNewly developed and commercial dental resins which are commonly used nowadays have to be tested for their antimicrobial susceptibility. The purpose of this in vitro study was to investigate the antimicrobial activity of a titanium oxide (TiO2) nano-composite which was prepared with different antibacterial substances and used as restoratives in dentistry to combat certain selected bacteria that are considered the principle causes of some tooth diseases, for example, tooth decay and to prevent unsuccessful dental restoration. The TiO2 nano-composite was prepared and divided into four groups: The first group was an untreated TiO2 nano-composite. The second group was silane-treated TiO2 nano-composite. The third group was treated TiO2 nano-composite which was combined with chlorhexidine gluconate (CHxG). The fourth group was treated TiO2 nano-composite which was combined with benzalkonium chloride (BzCl). Five of the selected bacteria were grown overnight in Petri dishes. Four of them, namely, Escherichia coli (E. coli) ATCC 11775, Staphylococcus aureus (S. aureus) ATCC 12600, Enterococcus faecalis (E. faecalis) ATCC 29212, and Pseudomonas aeruginosa (P. aeruginosa) ATCC 10145, were grown on Müller-Hinton Agar (MHA). Streptococcus mutans (S. mutans) ATCC 25175 was grown on Brain Heart Infusion (BHI) agar. All these bacteria were tested against the TiO2 nano-composite, and incubated for 24 hours at 37°C, except S. mutans, which was incubated separately and exposed to CO2. It was placed into a CO2 water-jacketed incubator in an atmosphere of 5% CO2 for 24 hours at 37°C. The obtained results showed that neither of the groups of TiO2 nano-composites, (untreated TiO2 nano-composite and treated TiO2 nano-composite) exhibited antimicrobial activity against the pathogens. Only preparations of TiO2 nano-composites at a concentration of 3 %m/m of both CHxG and BzCl showed antimicrobial activity against S. aureus. Antimicrobial activity against S. mutans, E. coli, P. aeruginosa, E. faecalis and S. aureus, were only realized at a concentration of 10 %m/m for both CHxG and BzCl..
Rodrigues, Roger Borges. "Avaliação clínica longitudinal de restaurações de uma resina composta bulk-fill em dentes posteriores." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/152664.
Full textObjectives: The objective of this randomized clinical trial was to evaluate the behavior of bulk-fill composite restorations in posterior teeth (classes I and II). Methodology: Seventeen patients who required restorations on at least two posterior teeth were selected to participate in the study. The causes for indication of restorations were: replacement of deficient amalgam or composite resin restoration and/or caries lesion. In each patient, two restorations were performed. Randomly, one cavity was restored with Esthet-X HD nanohybrid composite (control group) and the other was restored with Esthet-X HD resin associated with the bulk-fill composite Surefil SDR Flow (test group). In both groups, a two-step total-etch adhesive system (XP Bond) was used. All patients received global treatment for carious activity. After a period of four years, the quality of the restorations was evaluated by a previously calibrated examiner, through a modification of the USPHS method and through the FDI method. The data were submitted to statistical analysis by the non-parametric Mann-Whitney test (p <0.05) and the intra-observer agreement was evaluated by Kappa test. Results: At the 4-year follow-up, 26 teeth (18 class I and 8 class II restorations) were evaluated, and no statistically significant differences between control and test groups were observed for both evaluation methods used. There were no failures in any of the restorations over time. Conclusion: The quality of class I and II restorations with bulk-fill resin was similar to that of conventional nanohybrid resin. The bulk-fill composite technique showed good clinical performance as well as the conventional one during the 4 years of follow-up.
Lindberg, Anders. "Resin composites : Sandwich restorations and curing techniques." Doctoral thesis, Umeå : Umeå University, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-510.
Full textCatelan, Anderson 1983. "Influence of the energy density on the physical properties and bond strength of two restorative systems = Influência de densidade de energia nas propriedades físicas e na resistência de união de dois sistemas restauradores." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288868.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O propósito deste estudo foi avaliar a influência de diferentes densidades de energia nas propriedades físicas e na resistência de união de sistemas restauradores a base de metacrilato [Clearfil SE Bond (Kuraray) + FiltekZ250 (3M ESPE)] e silorano [sistema Filtek P90 (3M ESPE)], foto ativados com LED de segunda geração de acordo com os grupos experimentais. Espécimes foram confeccionados para o teste de grau de conversão (GC); os espectros de absorção foram obtidos por meio da espectroscopia FT-IR e FT-Raman para os adesivos (n = 10) e compósitos (n = 5), respectivamente. A dureza Knoop (DK) foi avaliada no topo e base dos compósitos (n = 10). Após 24 h de imersão em etanol absoluto, nova leitura de DK foi realizada para obtenção da plastificação (P) pela redução percentual da dureza. Os testes de sorção de água (SA) e solubilidade(S) dos adesivos (n = 5) e compósitos (n = 5) foram realizados de acordo com a norma 4049:2009, exceto para o tamanho dos espécimes e protocolo de fotoativação. Para os testes de resistência de união (n = 7) e nanoindentação (n =3), cavidades Classe II foram realizadas nas proximais de molares humanos, as quais foram restauradas com os sistemas restauradores avaliados. O teste demicrotração foi realizado em uma máquina de ensaio universal sob velocidade constante de 0,5 mm/min. Na técnica da nanoindentação foram mensurados a nano dureza (ND) e o módulo de elasticidade reduzido (Er) da dentina, camada híbrida, adesivo e compósito. Os dados obtidos foram submetidos à análise estatística (alfa = 0,05). Para os adesivos a maior densidade de energia melhorou somente o GC (p < 0,05); o "primer" da P90 exibiu maior GC, SA e S comparado ao "Bond" do Clearfil e P90 (p < 0,05). O compósito metacrilato apresentou maior GC, DK, P e SA (p < 0,05) do que o silorano. Não houve diferença na S das resinas compostas (p > 0,05). Geralmente a superfície de topo mostrou maior GCe DK do que a base (p < 0,05). O sistema restaurador a base de metacrilato, bem como o aumento da densidade de energia mostraram maior resistência de união (p < 0,05), sem diferença entre 24 h e 6 meses (p > 0,05). Os valores de ND e Erdos materiais a base de metacrilato foram maiores do que os do silorano (p <0,05). A maior densidade de energia não melhorou a ND e Er dos materiais (p >0,05). O envelhecimento diminuiu a maioria das propriedades nanomecânicas dos componentes da interface dente-restauração (p < 0,05), exceto a ND e Erdo compósito e Er do adesivo (p > 0,05). Assim, pode-se concluir que as propriedades físicas e a resistência de união foram material-dependente; a maior densidade de energia melhorou a resistência de união, mas não influenciou, em geral, as propriedades físicas e nano mecânicas; e o envelhecimento diminuiu a maioria das nano propriedades dos componentes da interface dente-restauração, mas não afetou a resistência de união das restaurações
Abstract: The purpose of this study was to evaluate the influence of different energy densities on the physical properties and bond strength of methacrylate-[Clearfil SE Bond (Kuraray) + Filtek Z250 (3M ESPE)] and silorane-based [FiltekP90 system (3M ESPE)] restorative systems, light-cured with a second generation LED according to experimental groups. Specimens were carried out for the degree of conversion (DC) test; the absorption spectra were obtained by FT-IR and FTRamanspectroscopy for the adhesives (n = 10) and composites (n = 5), respectively. The Knoop hardness (KH) was evaluated at the top and bottom of the composites (n = 10). After 24 h of immersion in absolute ethanol, re-reading of KHwas performed to obtain the percentage reduction of the hardness. The water sorption (WS) and solubility (S) tests of the adhesives (n = 5) and composites (n =5) were performed according to ISO 4049:2009, except for specimens' dimension and light-curing protocol. For the bond strength (n = 7) and nanoindentation (n = 3) tests, Class II cavities were performed on the proximal of human molars, which were restored with the restorative systems evaluated. The micro tensile test was carried out in an universal testing machine under cross-head speed of 0.5 mm/min.In the nanoindentation technique were measured the nanohardness (NH) and reduced elasticity modulus (Er) of the dentin, hybrid layer, adhesive, and composite. The data obtained were subjected to statistical analysis (alpha = 0.05).For the adhesives the highest energy density improved only the DC (p < 0.05); the "primer" of the P90 exhibited greater DC, WS, and S compared to "bond" of the Clearfil and P90 (p < 0.05). The methacrylate composite showed higher DC, KH, P, and WS (p < 0.05) than silorane. There was no difference in the S of the composites (p > 0.05). Generally the top surface showed greater of DC and KHthan base (p < 0.05). The methacrylate-based restorative system, as well as increased energy density showed higher bond strength (p < 0.05), with no difference between 24 h and 6 months (p > 0.05). The NH and Ervalues methacrylate-based materials were greater than silorane (p < 0.05). The higher energy density did not improve the NH and Er materials (p > 0.05). The aging decreased the most nanomechanical properties of the components of the tooth restoration interface (p < 0.05), except the NH and Er of the composite and Erof the adhesive (p > 0.05). Thus, it can be concluded that the physical properties and bond strength were material-dependent; the highest energy density improved the bond strength, but not influenced, in general, physical and nanomechanicalproperties; and the aging reduced the most nanoproperties of the components of the tooth-restoration interface, but did not affect the bond strength of restorations
Doutorado
Dentística
Doutor em Clínica Odontológica
Freitas, Márcia Furtado Antunes de. "Desgaste abrasivo da resina composta Filtek Z250 (4 diferentes cores, fotopolimerizadas por 3 diferentes tempos), através do método do disco retificado." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/25/25131/tde-29082007-110527/.
Full textThe aim at this study was estimate the influence of light-curing time variation of different colors (I, B1, B3 and C4) of composite resin (FiltekTM Z250, 3M ESPE), upon abrasive wear through the retified disc method. The porcelain existent in the named dynamic disc promoted a wear of each resin specimen located in the polimethylmetacrylate (PMMA) static disc, under a standardized charge and with controlled velocity. Vertical displacement of static disc was detected by a sensor that send data to a computer where wear arquives were plotted in function of time. After data statistical analysis, it could be concluded that: 1) PMMA resistance was greater than anyone of resins and 2) C4 was more resistant than all the other colors.
Carrilho, Neto Antonio 1962. "Brilho, rugosidade e integridade da superfície de resinas compostas = efeito do polimento e escovação." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289607.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo neste estudo foi avaliar a influência de sistemas de polimento e escovação mecânica simulada, sobre o brilho, rugosidade e integridade da superfície de materiais restauradores estéticos. Quatro compósitos foram avaliados: Filtek Z350 XT - 3M ESPE, Charisma Opal - Heraeus Kulzer, Amelogen Plus - Ultradent, Tetric N-Ceram - Ivocler Vivadent. Vinte amostras cilíndricas padronizadas foram obtidas para cada material e separadas aleatoriamente em 2 grupos (n=10), sendo que cada grupo foi submetido a um dos dois procedimentos de polimento (Sof-Lex - 3M ESPE e PoGo - Dentsply Caulk). Em seguida, todas as amostras foram submetidas às avaliações de brilho, mensurado com medidor (Zehntner ZGM 1120 Glossmeter) e a rugosidade com rugosímetro (Surfcorder SE1700 - Kosaka Lab) e submetidas a 30000 ciclos mecânicos de escovação simulada, utilizando solução de dentifrício (Colgate) e água destilada. Na seqüência da escovação, as mensurações de brilho e rugosidade foram repetidas. Em seguida, as amostras foram submetidas aos procedimentos de polimento, seguidos das avaliações de brilho e rugosidade. Os dados foram submetidos à ANOVA para medidas repetidas e teste de Tukey (p?0,05). Adicionalmente, amostras iniciais, escovadas e polidas foram examinadas em microscopia eletrônica de varredura (5600LV - Jeol) para avaliação qualitativa da integridade da superfície. Com base nos resultados de Rugosidade Média encontrados após a escovação simulada, pode-se concluir que a resina nanoparticulada apresentou menor rugosidade pela escovação mecânica (0,275 ?m) e maior brilho por ambos os métodos de polimento (PoGo 71,78 GU e Sof-Lex 70,64 GU); A escovação mecânica aumentou os valores médios de rugosidade e diminuiu o brilho dos compósitos; Os sistemas de polimento não foram capazes de recuperar a lisura quando comparados à fase inicial; Ambos os sistemas de polimento melhoraram o brilho deixado pela escovação, com exceção do compósito Amelogem Plus. Com base nas análises das imagens do MEV, foi possível observar que o sistema de polimento de múltiplos passos (Sof-Lex - 3M ESPE) favorece a presença de sulcos profundos
Abstract: The purpose in this study was to evaluate the influence of polishing systems and simulated mechanical toothbrushing, about gloss, rugosity and integrity on surfaces of esthetic restorative materials. Four composites were evaluated: Filtek Z350 Supreme (tem que colocar "supreme" no ingles?) XT (3M ESPE), Charisma Opal (Heraeus Kulzer), Amelogen Plus (Ultradent) and Tetric NCeram (Ivoclair Vivadent). Twenty cylindrical standardized specimens, for each material, were fabricated and ramdomly divided in two groups (n=10), each group being submitted to one of the two polishing protocols (Sof-Lex - 3M ESPE; POGO Dentsply Caulk). After, all specimens were submitted to the following evaluations, surface optical gloss was determined using a glossmeter (ZGM 1120 Glossmeter - Zehntner) and surface roughness was measured with a surface profilometer ( Surfcorder SE 1700 -Kosaka Lab.), and specimens were submitted to 30,000 mechanical simulated brushing cycles, with a dentifrice-water slurry (Colgate) and distilled water. Following brushing, gloss and roughness measurements were evaluated again. Then, specimens were submitted to the polishing process, followed by gloss and roughness evaluations. Data were submitted to ANOVA statistical analysis for repeated measures and Tukey Test (p?0,05). Additionally, initial specimens, brushed and polished, were evaluated under scanning electron microscopy (5600 LV-Jeol) for qualitative surface integrity. Based on the middle rugosity results found after simulated brushing, could be concluded that nanometric composites showed lower rugosity when submitted to mechanical simulated toothbrushing (0,275 ?m) and higher gloss with both polishing protocols (PoGo 71,78 GU e Sof-Lex 70,64 GU); mechanical tooth brushing increased the rugosity middle values and decreased the composite gloss; The polishing systems were not capable to recover smoothness when compared to the initial phase (polyester matrix); both polishing system improved gloss given by brushing, exceptionally for the Amelogen Plus composite. Based on MEV image analysis, was observed that the multiple step polishing system (Sof-Lex - 3M ESPE) favors the presence o deep sulcus
Doutorado
Materiais Dentarios
Doutor em Materiais Dentários
Persson, Anitha. "In vivo evaluations of the neutralizing effect of a hydroxyl ion-releasing resin composite and a prophylactic gel on plaque acidogenicity : measured by the microtouch method." Doctoral thesis, Uneå : Univ, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-945.
Full textBerwanger, Carolina dos Santos. "Avaliação clínica retrospectiva de restaurações diretas e indiretas com recobrimento de cúspides." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2016. http://hdl.handle.net/10183/152656.
Full textIntroduction: The increasing demand for aesthetic restorations had enabled new treatment choices to restore posterior teeth with extensive coronary destruction. The treatments of these teeth involve direct composite restoration or indirect onlays, made with ceramic or composite. However, clinical data on the longevity of cuspal restorations comparing direct or indirect techniques and the materials are rare. Objective: To perform a retrospective clinical evaluation of direct restorations (composite resin) and indirect restorations (composite resin and ceramics) with cuspal involvement using the FDI criteria. Methodology: 229 restorations were evaluated in 121 patients (37 men and 84 women) who received at least one direct composite restoration with envolvement of at least one cusp or ceramic and composite onlays among the years 2003 and 2016. The visual evaluation was done by an examiner previous calibrated by the Kappa coefficient, using the FDI criteria. Data were analyzed by the Kaplan-Meier method, multivariated Cox regression analysis and Kruskal-Wallis test (p<0.05). Results: Among the evaluated restorations, 69 failures were detected. Restorations achieved a survival rate of 69.9%, with annual failure rate (AFR) of 8.0%. Direct composite restorations presented a 34.1% failure, with AFR of 9.6%. Composite onlays presented 27.3% of failure, with AFR of 7.1%. Ceramic onlays showed a 28.8% failure rate with AFR of 7.6%. Restorations in men have failed more than in women. The most common reason for failure was fracture of the material and retention, occuring in 48 cases (69.56% of failures). Conclusion: Direct and indirect restorations showed similar longevity, regardless of the number of cusps involved. Indirect restorations had lower annual failure rate than direct restorations, presenting better performance in the qualitative analisys. Female patients presented lower prevalence and lower risk of failure of restorations than male.
Havertz, Matthew S. "A Narrative Approach to Educational Video Training." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7596.
Full textTrevisan, Tamara Carolina [UNESP]. "Avaliação da resistência de união de reparos em resinas compostas convencionais e bulkfill." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/138571.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Técnicas de reparos de restaurações vêm sendo amplamente utilizadas como um tratamento alternativo e conservador á substituição de restaurações defeituosas. O conhecimento do material a ser reparado e de um protocolo ideal, permitiria uma melhor relação biomecânica entre dente e material restaurador e possibilitaria técnicas eficazes e menos invasivas. O objetivo do presente estudo foi avaliar a resistência de união de reparo de diferentes resinas compostas, sob a influência de tratamentos de superfície, especialmente em relação a uma nova proposta comercial denominada de resinas "bulk fill". Para isso, foram confeccionados corpos de prova com diâmetro de 8mm por 4mm de altura, de diferentes classes de resinas compostas: Z350XT, Z250XT, Grandio, Epricord, Tetric Bulkfill, Xtra Fill e Sonic Fill (n=15). Estes passaram por processo de envelhecimento artificial, realizado por meio de armazenamento em estufa com saliva artificial por 3 meses, sendo realizada a troca da saliva semanalmente, e finalizado com termociclagem 5o e 55ºC por 20 segundos em água para 1000 ciclos. Foram distribuídos aleatoriamente em três subgrupos, de acordo com o tratamento de superfície (n=5): G1- Controle- sem tratamento prévio; G2- Jateamento óxido alumínio; G3- Jateamento óxido de sílica. Após a aplicação dos respectivos tratamentos de superfície, cada espécime foi reparado com resina composta Z100 em incrementos de aproximadamente 2mm e fotopolimerizado em um aparelho de fotopolimerização convencional (Bluephase, Ivoclar Vivadent, Liechtenstein) até obtenção 4 mm de altura. A seguir os espécimes foram submetidos a novo ciclo de envelhecimento artificial por uma semana em estufa com saliva artificial, e termociclagem 5o e 55ºC por 20 segundos em água para 1000 ciclos. As amostras foram seccionadas em seu longo eixo em máquina de corte (Isomet 1000, Buehler Ltd, Lake Bluff, IL, EUA), a fim de se obter espécimes no formato de paralelepípedo, com a linha de união localizada centralmente. Cada espécime foi individualmente fixado em máquina de microtração Micro Tensile Tester- MTT (BISCO, Inc. 1100 W. Irving Park Rd. Schaumburg, IL 60193 USA 1- 800-247-3368), e submetido a teste de microtração com velocidade de 0,5 mm/min e célula de carga de 500N. Realizou-se análise de variância para avaliar a influência dos diferentes materiais e tratamentos de superfície na resistência de união de reparos. O padrão de fratura observado nos reparos foi analisado por meio do teste de qui-quadrado( 2 ), para uma com significância estatística de 5%. A análise de variância mostrou que existe diferença estatisticamente significativa (p=0,001) entre a resistência coesiva dos materiais, e para interação material e tratamento de superfície sobre a resistência de união dos reparos (p=0,001). O teste de quiquadrado( 2 ) também mostrou que existe associação entre o tipo de fratura e as variáveis materiais e tratamentos de superfície (p=0.001). Concluindo que, as diferentes classes de resinas compostas testadas respondem de maneira diferente frente aos tratamentos de superfície aplicados, não sendo possível estabelecer um protocolo clínico ideal para procedimentos de reparo. Além disso, as resinas bulkfill testadas possuem resistência de união aceitável, semelhante às demais classes de resinas compostas, demonstrando que procedimentos de reparo são indicados para esses materiais.
Restoration repair techniques have been widely used as an alternative and conservative treatment for replacement of defective restorations. The knowledge of the material to be repaired and an ideal protocol would allow a better biomechanical relationship between tooth and restorative material and would allow techniques effective and less invasive. The aim of this study was to evaluate the repair's bond strength of different composite resins under the influence of surface treatments, especially in relation to a new commercial proposal called Bulk-fill Resin-based Composites. For this, specimens were prepared with 8 mm diameter by 4 mm in height, of different classes of composite resins: Z350XT, Z250XT, Grandio, Epricord, Tetric Bulkfill, Xtra Fill e Sonic Fill (n=15). These were submitted to artificial aging process by storing in an oven with artificial saliva for 3 months, and their exchange performed weekly and finished 5 o and 55°C thermocycling for 1000 cycles. They were randomly divided into three subgroups, according to the surface treatment (n=5): Control group- without treatment (G1), Aluminum oxide blasting (G2), Silica oxide blasting (G3). After applying the respective surface treatments, each specimen was repaired with composite resin (Z-100, 3M ESPE) in increments of 2mm, approximately, and light cured in a conventional light-curing unit (Bluephase, Ivoclar Vivadent, Liechtenstein) to obtain 4 mm height. Then specimens were subjected to a new cycle of artificial aging for one week incubated in artificial saliva and thermal cycling 5 and 55°C for 1000 cycles. The samples were sectioned in their long axis in a cutting machine (Isomet 1000, Buehler Ltd, Lake Bluff, IL, USA) in order to obtain the specimens in parallelepiped shape with union line centrally located. Each specimen was individually set at a micro-tensile machine Micro Tensile Tester - MTT (BISCO, Inc. 1100 W. Irving Park Rd. Schaumburg, IL 60193 USA 1-800-247-3368), and submitted to micro-tensile test at 0.5 mm/min speed with a 500 N load cell. It was performed variance analysis for there is influence of different materials and surface treatments on the bond strength of repair. The fracture pattern observed in repairs was analyzed using the chi-square test ( 2 ) with 5% statistical significance level. Analysis of Variance showed that there was a statistically significant difference (p=0.001) between the tensile strength of materials, and for interaction materials and surface treatment on bond strength of repair (p=0.001). There was association between the type of fracture and the variables material and surface treatments (p=0.001). It can be concluded that the different classes of composites tested respond differently compared to the applied surface treatment and it is not possible to establish a clinical protocol for repair procedures. Moreover, the tested bulk fill resins have acceptable bond strength, similar to other classes of composites, demonstrating that these materials are suitable for repair procedures.
Carvalho, Paulo Roberto Marão de Andrade [UNESP]. "Desempenho clínico de diferentes estratégias de adesão de restaurações de lesões cervicais não cariosas." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/148789.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Introdução: O objetivo deste estudo clínico controlado, prospectivo, randomizado e com avaliadores cegos foi avaliar o desempenho clínico de restaurações cervicais não cariosas frente às diferentes estratégias de adesão ao substrato dental. Métodos: foram utilizados um sistema restaurador adesivo (Single Bond Universal/Z350XT) com e sem condicionamento seletivo do esmalte e um cimento de ionômero de vidro modificado por resina (Vitremer) com e sem tratamento prévio com EDTA, seguindo as instruções do CONSORT. Um total de 200 restaurações foram realizadas por dois operadores em 50 pacientes voluntários. Previamente à execução das restaurações e em cada tempo de avaliação foram avaliados os índices de sangramento gengival, placa visível e CPOD. Todas as restaurações foram avaliadas por meio do sistema de avaliação do USPHS modificado. Dois examinadores calibrados, cegos e diferentes dos operadores realizaram as avaliações nos seguintes intervalos de tempo: inicial imediato (baseline), 6, 12 e 24 meses. Ao final de 24 meses os dados foram analisados pelos testes estatísticos de Friedman, Qui-quadrado, Kappa, Cochran, Wilcoxon e análise de regressão logística múltipla, adotando-se nível de significância a 5%. Resultados: a amostra foi composta de 34 homens e 16 mulheres com idade média de 61,8 anos. Em relação ao CPOD, houve um aumento gradativo e significante ao longo do tempo, havendo diferença entre os quatro tempos de avaliação (p≤0,001). Não teve diferença entre os tempos para o índice de placa visível (p=0,28). No entanto, houve uma redução significativa do índice de sangramento gengival entre o baseline e os demais tempos (p≤0,001). Não houve diferença estatisticamente significante entre os 4 grupos em cada tempo de avaliação em nenhum dos critérios avaliados (p>0,05), assim como não houve entre os 4 tempos de avaliação para todos os grupos (p>0,05). Em relação à regressão logística, embora não tenha apresentado nenhuma variável isolada como estatisticamente significante, o modelo como um todo apresentou-se estatisticamente significante (p=0,034). Conclusão: As quatro diferentes estratégias de adesão em restaurações cervicais não cariosas apresentaram similar desempenho clínico após 24 meses de acompanhamento.
Introduction: the aim of this study, prospective, randomized controlled clinical trial and with blind evaluators was to evaluate the clinical performance of non-carious cervical restorations to different strategies of adhesion for the dental substrate. Methods: we used a restorative adhesive system (Universal/Z350XT Single Bond) with and without selective etching of enamel and a modified glass ionomer luting cement for resin (Vitremer) with and without previous treatment with EDTA, following the instructions of the CONSORT. 200 in total restorations were performed by two operators in 50 patients. Prior to the execution of the restorations and each time, we evaluated the evaluation indexes of gum bleeding, visibly Board and CPOD. All restorations were evaluated using the evaluation system USPHS modified. Two calibrated examiners, blind and different operators, performed the evaluations in the following time intervals: immediate initial (baseline), 6, 12 e 24 months. At the end of 24 months data were analyzed by statistical tests Friedman, Qui-quadrado, Kappa, Cochran, Wilcoxon and multiple logistic regression analysis, adopting the significance level 5%. Results: the sample was composed of 34 men and 16 women with an average age of 61.8 years. Concerning the CPOD, there was a gradual and significant increase over time, difference between the four evaluation times (p≤0,001). There was no difference between the time the visible card index (p=0,28). However, there was a significant reduction of gingival bleeding index between the baseline and other times (p≤0,001). There was no statistically significant difference among the 4 groups in each time any of the assessment criteria evaluated (p>0,05), just as happened with the 4 times of evaluation for all groups (p>0,05). With regards to the logistic regression, although it has not presented any isolated variable as statistically significant, the model as a whole showed statistically significant (p=0,034). Conclusion: The four different adhesive strategies in non-carious cervical restorations showed similar clinical performance after 24 months of follow-up.
FAPESP: 2014/07086-0
Perlmuter, Judith Liberman. "Avaliação clínica de restaurações adesivas após remoção parcial de tecido cariado em dentes decíduos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2013. http://hdl.handle.net/10183/87158.
Full textCurrent knowledge of the pathogenesis of caries allows more conservative treatments. The technique of partial caries removal (PCR) is an example of this new approach; it allows a greater preservation of tooth structure and prevents pulpal exposures. However, little is known about the composite resin restorations after treatment. The purpose of this study was to assess the follow-up performance of composite restorations after PCR technique compared to the TCR after 36 months. The study involved 48 children between 3-8 years old, with acute deep carious lesions on the occlusal or occlusal-proximal surface (s). In total, 120 teeth (65 PCR and 55 TCR) were analyzed. Randomization was performed by drawing lots. A single trained and calibrated examiner evaluated the presence of total or partial loss of restorations. The explanatory variables were related to the outcome through statistical tests Cox Regression univariate and multivariate (α = 5 %). The overall survival rate of the restorations was 69.5% after 36 months. For groups of TCR and PCR the success rate was 81% and 57%, respectively (p = 0.004). There was a lower survival rate of restoration in teeth with occlusal- proximal cavities (58%) compared to occlusal (87%), p = 0.02. The Cox Regression models univariate demonstrated that treatment and the type of cavity had a statistically significant influence on the probability of failure of restorations over 36 months. In the final multivariate model was observed that the performance of PCR generated a 3.44 times greater probability of failure of the restoration over 36 months compared to conventional treatments (p = 0.006). Regarding caries activity, 71% of teeth at 36 months were in patients with caries activity. The survival rate was 63 % for fillings in patients with activity and 80 % in those without caries activity. From the results, it was concluded that performing composite restorations in primary teeth after PCR has significantly lower success rate compared to TCR restorations after three years of monitoring. The restorations of cavities involving two sides had a higher failure rate compared to single surface. The caries activity of the individual did not affect the longevity of the restoration.
Vieira, Rodrigo Monteiro. "Avaliação clínica retrospectiva de restaurações estéticas : classe III, IV e V." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2015. http://hdl.handle.net/10183/125809.
Full textThe aim of this study was to evaluate direct composite restorations Class III, IV, V in anterior teeth and premolars through the USPHS and FDI methods. Eighty-seven patients were selected through a search of the patients’ records present in the School of Dentistry. Restorations performed between 2000 to 2013 which a minimum of six months in mouth were selected. Adult patients of both sexes were included, who received treatment with restorations class III, IV or V with the follow composites: Charisma, Z350 XT, Durafill VS, Esthet-X HD, Fillmagic and Opallis; all restorations with total etch adhesive system; on vital and non-vital teeth. Patients with poor oral hygiene or special needs were not included in the study. Clinical evaluation was performed by USPHS and FDI modified methods, by one calibrated examiner. The survival of the restorations was analyzed using the Kaplan-Meier method and log-rank test to compare the groups, and multivariate Cox regression and hazard ratio were employed to identify factors associated with the failure of the restorations. The significance level was 5%. 272 restorations were evaluated with a time interval in service from 8 months to 13 years (mean 4.8 years). 120 class III restorations were evaluated, among them, 15 had failures (12.5%), with an annual failure rate of 2.74%. For the class IV type, 80 restorations were evaluated, 38 demonstrated failures (47.5%), with an annual failure rate of 12.6%. And for the class V, 72 restorations were analyzed, being observed the presence of failures in 27 of them (37.5%), with annual failure rate of 9.3% .The most common reason for failure was fracture or retention loss, for the three types of classes, occurring in 73 cases. Non-vital teeth showed 50% of failure in an average of 4.8 years, with an annual failure rate of 13.4%; while the vital teeth showed 28.1% of failure, with an annual failure rate of 6.6%. Cox regression revealed an association between brands, class type and tooth vitality with failures of the restorations. It was concluded that composite restorations showed a satisfactory clinical performance over time, with success in 70.6% of cases in a mean time of 4.8 years. Class III showed better clinical performance than class IV and V. Non-vital teeth restorations had 2.37 times the risk of failures than vital teeth. The main reasons for failure for all types of restoration was fracture and / or retention loss. Both methods (USPHS and FDI) demonstrated efficient in the process of clinical evaluation for anterior teeth.
Alonso, Roberta Caroline Bruschi. "Formação de fendas em restaurações de composito : tecnicas de avaliação, efeito de metodos de fotoavaliação e relação com a resistencia da união." [s.n.], 2007. http://repositorio.unicamp.br/jspui/handle/REPOSIP/288115.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: A formação de fendas em restaurações de compósito foi caracterizada neste estudo, abrangendo-se técnicas de avaliação, fatores modificadores e a relação com a resistência de união das restaurações à estrutura dental. No capítulo 1, objetivou-se validar a técnica do corante para avaliação das fendas através da comparação com a observação em Microscopia Eletrõnica de Varredura (MEV). Vinte incisivos bovinos foram selecionados e desgastados até expor uma área plana em dentina, onde duas cavidades foram preparadas e restauradas com o compósito Filtek 2250 ou Filtek Flow. As amostras foram polidas e réplicas foram obtidas em resina epóxica. As réplicas foram observadas em MEV para determinar a porcentagem de fenda ao longo da margem cavitária. Na técnica do corante, Caries Detector (Kuraray) foi aplicado sobre as restaurações durante 5s. A imagem digital das restaurações coradas foi analisada com o software Image Tool para determinar a porcentagem de fendas. Os dados foram submetidos a ANOVA e teste de correlação de Pearson. Filtek Flow apresentou 35,54% e 33,52%, e Filtek 2250 26,68% e 29,11% de fendas, quando avaliadas em MEV e pela técnica do corante, respectivamente. Não houve diferença significativa entre os compósitos independente do método de avaliação, havendo forte correlação positiva (r=0,83) entre eles. Concluiu-se que a técnica do corante pode ser utilizada para avaliação das fendas com confiabilidade dos resultados. No capítulo 2, o efeito de métodos de fotoativação modulados na' adaptação marginal e intema de restaurações confeccionadas com diferentes compósitos foi determinado. Sessenta terceiros molares foram selecionados, seccionados (2 fragmentos) e tiveram a superfície vestibular ou palatina ou lingual desgastada para expor uma área plana em esmalte, onde uma cavidade foi confeccionada. Os dentes foram distribuídos em 12 grupos (n=lO), segundo o compósito restaurador (Filtek 2250, Herculite XRV e Heliomolar) e o método de foto ativação (Luz continua; Soft-Start; Pulse delay; Luz intermitente). O teste de adaptação marginal (técnica do corante) foi conduzido da mesma maneira descrita anterionnente. Após, os espécimes foram seccionados dividindo a restauração em 4 fatias, que foram coradas e o mesmo procedimento de avaliação da adaptação marginal foi realizado para determinar a adaptação intema. Assim, põde-se observar que todas as restaurações apresentaram perfeito selamento das margens extemas. Considerando as fendas intemas, os métodos modulados geraram redução significativa nas fendas quando comparados à luz contínua, independe do compósito empregado. Filtek 2250 apresentou a melhor adaptação interna, independente do método de fotoativação. A interação tipo de compósito e método de fotoativação não foi significativa. Conclui-se que os métodos de fotoativação modulados são eficientes na redução da formação de fendas internas e que podem ser indicados para a prática clínica, independente do compósito empregado. No capítulo 3, o objetivo foi relacionar a resistência da união à adaptação marginal e interna de restaurações fotoativadas por diferentes métodos. A resistência da união foi mensurada em cavidades tronco-conicas confeccionadas em dentes bovinos através do teste push-out (Instron). A adaptação marginal e interna das restaurações foi verificada da mesma maneira descrita anteriormente. Em ambos os testes, as cavidades foram restauradas com o compósito Esthet-X, sendo as amostras distribuídas em 5 grupos (n=10), de acordo com o método de fotoativação: G 1 - Luz contínua; G2 - Luz contínua baixa intensipade; G3 - Soft-start; G4 - Luz Intermitente; G5 - Pulse Delay. A dose de energia foi padronizada em 14J. Os dados foram submetidos a ANOVA e teste de Tukey. Considerando resistência da únião, G5 (7,2 MPa) apresentou resultados significativamente melhores que G 1 (4,6 MPa). G2, G3 e G4 tiveram médias intermediárias, não havendo diferenças significativas entre esses grupos e entre eles e G 1 ou G5. Considerando adaptação marginal, não houve diferença significativa entre os grupos. Na adaptação interna (que incluía o substrato dentinário), o resultado foi inverso ao do teste de resistência de união, ou seja, G5 (2,8%) teve menor média de fendas que G 1 (10,1%). Concluiu-se que a modulação da energia luminosa pode acarretar em aumento da resistência da união e redução na formação de fendas internas, havendo relação inversa entre resistência da união e formação de fendas internas
Abstract: Gap formation in composite restorations has been characterized in this dissertation by way of evaluation techniques, modifying factors and the relationship between bond strength of the restorations and the dental structure. In Chapter 1 the objective was to compare the dye staining technique to Scanning Electron Microscopy (SEM) evaluation of gap formation in order to validate the dye technique. Twenty bovine incisors were selected and ground so as to expose a flat dentin area in which two circular cavities were prepared and restored using Filtek 2250 or Filtek Flow. The specimens were polished and replicas were obtained in epoxy resin. Replicas were observed in SEM to determine the percentage of gap fonnation in the margins of the restorations. In dye staining technique, the Caries Detector was applied on each restoration for 5 seconds. Digital images of the stained restorations were analyzed using Image Tool to determine gap percentage. Data were submitted to ANOVA and Pearson's correlation. Filtek Flow showed 35.54% and 33.52% of gap and Filtek 2250 showed 26.68% and 29.11%, when evaluated using SEM and Dye staining technique, respectively. There was no difference between the composites, regardless of the evaluation technique. There was a strong positive correlation (r=0.83) between the results obtained through the tested methods to assess marginal gap. This led to the conclusion that dye staining technique can be reliably employed to evaluate the gap fonnation in composite restorations. Chapter 2 aims at determining the effect of modulated photoactivation methods on gap fonnation of restorations using different composites. Sixty third molars were selected, sectioned (2 fragments) and ground so as to expose a flat enamel area in which a cavity was prepared. The specimens were distributed into twelve groups (n=10), according to the restorative composite (Filtek 2250, Herculite XRV, and Heliomolar) and the photoactivation method (Continuous Light, Soft-Start, Pulse Delay, and Intermittent Light) applied. Marginal adaptation test was conducted in the same way described before (dye staining technique). The specimens were then sectioned in 4 slices, all of which were stained, and the same evaluation procedure used to determine marginal adaptation was employed to evaluate internal gap fonnation. All restorations showed perfect sealing of the enamel outer margins. With regards to internal adaptation, modulated photoactivation methods showed a significant reduction on gap fonnation when compared under continuous light, regardless of the composite. Filtek 2250 showed the best internal adaptation, regardless of the photoactivation method. The interaction between restorative composite and photoactivation method was not significant. The conclusion was that modulated photoactivation methods decrease the internal gap formation of composite restorations and should thus be encouraged on clínical practice, regardless of the type of composite. In Chapter 3, the aim was to evaluate the relationship between bond strength and marginal and internal adaptation of composite restorations photocured by different methods. Bond strength was measured in conical cavities prepared in bovine incisors using push-out test (Instron). Marginal and internal adaptation testswere conducted in the same way as before (dye staining technique). For both tests, cavities were filled with Esthet X resin composite. The specimens were distributed into 5 groups (n= 1 O) according to photoactivation method: G 1 - continuous light; G2 low intensity continuous light; G3 - soft start; G4 - intermittent light; G5 - pulse delay. 14J was the standard energy dose. Data were submitted to ANOVA and Tukey's test. Regarding bond strength, G5 (7.2 MPa) was statistically superior to Gl (4.6 MPa). G2, G3 and G4 showed intermediate mean values, which were not different from each other or from G 1 or G5. Regarding marginal adaptation, there was no statistical difference among the groups. Internal adaptation results (that included dentin substrate) were the opposite of bond strength results. G5 (2.8%) showed a reduction on gap formation when compared to Gl (10.1%). In conclusion, it may be said that the modulated photocuring methods can increase bond strength while decreasing internal gap formation. An opposite relationship was observed regarding push-out bond strength and internal adaptation of composite restorations
Doutorado
Materiais Dentarios
Doutor em Materiais Dentários
Guimarães, Raphaella Mendes. "Influência de tratamentos superficiais na resistência de união de reparo em resina a base de silorano: análise após envelhecimento." Universidade Federal de Goiás, 2011. http://repositorio.bc.ufg.br/tede/handle/tede/3762.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
The aim of the present study was to evaluate the influence of different surface treatments on bond strength of repair resin-based silorane through microtensile test. 160 silorane blocks were randomly distributed among 40 experimental groups (n=4) resulting from the interaction of three factors under study: surface treatment, adhesive system and resin used to repair. The blocks were stored for 9 days in deionized water at 37°C prior to surface treatment and repair. Repair was performed, after the use of a bonding agent: (Ad 1) Silorane bond or (Ad 2) Adper Scotchbond, with Filtek P90 (P90) or Filtek Z350 XT (Z350 XT) on one of the 10 treatment protocols: control (C), silane (Si), phosphoric acid (Pa), Pa plus Si (PaSi), hydrofluoric acid (Ha), Ha plus Si (HaSi), sandblasting (S), S plus Si (SSi), diamond bur (Db), Db plus Si (DbSi). Blocks were sectioned into beams and after age by storage for six months, subjected to microtensile testing and subsequent analysis in a stereoscope to define the failure types. Additionally, 10 blocks of Filtek P90 composite resin were made for surface analysis by SEM, after completion of surface treatment. Statistical analysis (Mann-Whitney, Kruskal- Wallis and Dunn tests, α=0.05) was performed. The values were statistically influenced by the type of resin (p<0.001) and by the surface treatment (p<0.0001), but not by the bonding agent (p=0,940). SSi, Ha and HaSi produced similar bond strength values, the greatest. Treating the surface with Db showed the worst values and composite resin P90 generated higher bond strength values than Z350 XT to repair silorane surfaces.
O objetivo deste estudo foi avaliar a influência de diferentes tratamentos superficiais na resistência de união de reparo em resina composta à base de silorano, por meio de ensaio de microtração. Foram aleatoriamente distribuídos 160 blocos de resina composta a base de silorano em 40 grupos experimentais (n=4) resultantes da interação entre 3 fatores em estudo: tratamento superficial, sistema adesivo e resina para realizar o reparo. Os blocos confeccionados foram armazenados durante 9 dias em água deionizada a 37°C previamente à realização do tratamento superficial e reparo. O reparo foi realizado após a aplicação do sistema adesivo silorano da Filtek P90 (Ad 1) ou do sistema adesivo Adper Scotchbond Multi-uso (Ad 2), com a resina composta Filtek P90 (P90) ou Filtek Z350 XT (Z350 XT), em um dos dez diferentes tipos de tratamento superficial: controle (C), silano (Si), ácido fosfórico (Af), Af e Si (AfSi), ácido hidrofluorídrico (Ah), Ah e Si (AhSi), jateamento (J), J e Si (JSi), ranhuras (R), R e Si (RSi). Os blocos foram seccionados em forma de palito, em seguida armazenados por seis meses, e então submetidos ao ensaio de microtração e posterior análise em lupa estereoscópica para definição do padrão de fratura. Adicionalmente, foram confeccionados 10 blocos de resina composta Filtek P90 para análise da superfície em MEV, após a realização dos tratamentos superficiais. Os dados obtidos foram submetidos a análise estatística (Mann-Whitney, Kruskal-Wallis e Dunn, α=0,05). Pôde-se verificar que os valores de resistência de união foram estatisticamente influenciados pelo tipo de resina (p<0.001) e pelos tratamentos superficiais (p<0.0001), porém não houve diferença para os adesivos (p= 0,940). JSi, Ah e AhSi foram semelhantes entre si e apresentaram os maiores valores. O emprego de ranhuras resultou nos piores resultados e a resina P90 proporcionou maiores valores de resistência de união do que a resina Z350 XT para reparo em resina composta a base de silorano.
AlRefeai, Mohammad Hamdan S. "The assessment of multiple factor effect on the survival of anterior composite restorations at UICOD between 1995-2013." Thesis, University of Iowa, 2015. https://ir.uiowa.edu/etd/1531.
Full textTrevisan, Tamara Carolina. "Avaliação da resistência de união de reparos em resinas compostas convencionais e bulkfill /." Araraquara, 2016. http://hdl.handle.net/11449/138571.
Full textBanca: Weber Adad Ricci
banca: Gustavo Moncada
Resumo: Técnicas de reparos de restaurações vêm sendo amplamente utilizadas como um tratamento alternativo e conservador á substituição de restaurações defeituosas. O conhecimento do material a ser reparado e de um protocolo ideal, permitiria uma melhor relação biomecânica entre dente e material restaurador e possibilitaria técnicas eficazes e menos invasivas. O objetivo do presente estudo foi avaliar a resistência de união de reparo de diferentes resinas compostas, sob a influência de tratamentos de superfície, especialmente em relação a uma nova proposta comercial denominada de resinas "bulk fill". Para isso, foram confeccionados corpos de prova com diâmetro de 8mm por 4mm de altura, de diferentes classes de resinas compostas: Z350XT, Z250XT, Grandio, Epricord, Tetric Bulkfill, Xtra Fill e Sonic Fill (n=15). Estes passaram por processo de envelhecimento artificial, realizado por meio de armazenamento em estufa com saliva artificial por 3 meses, sendo realizada a troca da saliva semanalmente, e finalizado com termociclagem 5o e 55ºC por 20 segundos em água para 1000 ciclos. Foram distribuídos aleatoriamente em três subgrupos, de acordo com o tratamento de superfície (n=5): G1- Controle- sem tratamento prévio; G2- Jateamento óxido alumínio; G3- Jateamento óxido de sílica. Após a aplicação dos respectivos tratamentos de superfície, cada espécime foi reparado com resina composta Z100 em incrementos de aproximadamente 2mm e fotopolimerizado em um aparelho de fotopolimerização convencion... (Resumo completo, clicar acesso eletrônico abaixo)
Mestre
Jardim, Juliana Jobim. "Remoção parcial de tecido cariado em lesões de cárie profundas de dentes permanentes." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2010. http://hdl.handle.net/10183/24665.
Full textOliveira, Carlos Rangel de Moura. "Resistência à fratura de diferentes núcleos de preenchimento com compósitos bulk fill em dentes com extensa destruição coronária /." Araraquara, 2019. http://hdl.handle.net/11449/183249.
Full textResumo: Este estudo objetivou avaliar a resistência máxima e o padrão de fratura de diferentestécnicas para núcleo preenchimento associados a pinos de fibra de vidro em incisivoslaterais inferiores bovinos com extensa destruição coronária. Quarenta dentes forampreparados endodonticamente, divididos aleatoriamente em 4 grupos experimentais(n=10) e um pino de fibra de vidro (Whitepost DC0,5) foi cimentado com LuxaCore Zpara todos os grupos. A confecção dos núcleos de preenchimento foi realizada, apósobtenção de férula cervical de 1,0 mm, com: FOBF-Filtek One Bulk Fill; FZ350- FiltekZ350 XT; FBFF-Filtek Bulk Fill Flow; e LCZ-LuxaCore Z. Coroas totais de zircônia (YTZP) produzidas em CAD/CAM foram cimentadas com RelyX U200. Apósarmazenamento em água destilada a 37°C por 48 h, os corpos-de-prova foramsubmetidos a ciclos térmicos (10.000 ciclos, 5-55ºC, banhos de 30s) e, posteriormente,ao ensaio mecânico de resistência à fratura por força compressiva aplicada (1,0mm/min) em 135º ao longo eixo do dente em máquina eletromecânica (EMIC DL2000).A força máxima suportada por cada espécime foi registrada em Newton. O modo defratura foi classificado por meio de análise em lupa estereomicroscópica (30X). Osdados de resistência à fratura foram analisados pelo teste não paramétrico de KruskalWallis, seguido pelo post-hoc teste de Dunn. Os dados dos padrões de fratura foramanalisados pelo teste exato de Fisher (α=0,05). Não foram observadas diferençassignificativas (p>0... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: This study aimed to evaluate the ultimate fracture strength and failure modes of different core techniques associated with intraradicular fiberpost in bovine mandibular lateral incisors with extensive coronary destruction. Forty teeth were prepared endodontically, randomly divided into 4 experimental groups (n=10) and a fiberpost (Whitepost DC0.5) was cemented with LuxaCore Z for all groups. The core was confeccioned, after obtaining a 1.0 mm cervical ferrule, with: FOBF-Filtek One Bulk Fill; FZ350- Filtek Z350 XT; FBFF-Filtek Bulk Fill Flow; and LCZ-LuxaCore Z. Total zirconia crowns (Y-TZP) produced by CAD/CAM were cemented with RelyX U200. After storage in distilled water at 37ºC for 48 h, the specimens were submitted to thermal cycling (10,000 cycles, 5- 55ºC, 30 s dwell time) and, afterwards, to the mechanical test of compressive strength fracture (1.0 mm / min) at 135º along the tooth axis in electromechanical machine (EMIC DL2000). The ultimate load supported by each specimen was recorded in Newton. The fracture mode was classified by means of stereomicroscopic loupe analysis (30X). The fracture strength data were analyzed by the non-parametric Kruskal-Wallis test, followed by the post-hoc Dunn test. The data of the fracture modes were analyzed by Fisher's exact test (α=0.05). No significant differences (p>0.05) were observed among the FOBF, FZ350 and FBFF groups (mean ranks= 20.30, 12.20 and 23.20, respectively). LCZ (mean rank= 26.30) produced similar results to those... (Complete abstract click electronic access below)
Mestre
Di, Francescantonio Marina 1983. "Evaluation of bond strenght, polymerization stress, adaptation in cavity class II and other properties of restorative systems = Avaliação da resistência de união, contração de polimerização, adaptação em cavidade classe II e de outras propriedades de sistemas restauradores." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/287806.
Full textTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: Os objetivos deste estudo foram: 1) caracterizar os elementos químicos e morfologia das partículas de carga de compósitos convencionais e de baixa contração; 2) avaliar a rugosidade superficial (RS) e 3) a sorção de água (SA) e solubilidade (SO) após acabamento/polimento, 24h e após 1 ano de armazenamento de água; 4) tensão de polimerização (TP) dos compósitos; 5) avaliar a adaptação interna (AI) em cavidades Classe II utilizando técnica restauradora incremental e bloco único 24h e um ano de armazenamento em água e 6) a resistência de união (RU) de sistemas restauradores baseados em metacrilatos e silorano após 24 h e após um ano de armazenamento. Quatro resinas compostas foram avaliadas: duas de baixa contração (Filtek Silorane e Aelite LS) e duas convencionais (Heliomolar e Tetric N-Ceram) Para a RU e análise FF, adesivos do mesmo fabricante foram utilizados: Excite para Tetric NCeram e Heliomolar; One-Step Plus para Aelite LS e Silorane System Adhesive para Filtek Silorane. Para caracterizar as partículas de carga, uma porção de cada material (n=5) foi imersa em solventes orgânicos e observada por MEV e EDS. Para avaliar a RS, SR e SO (n=10), os sistemas de acabamento e polimento foram usados seguindo as instruções do fabricante. As superfícies polidas foram analisadas utilizando um perfilometro, determinando a RS. Para a SR e SO , as amostras foram armazenadas e a massa de cada amostra foi medida. Os espécimes foram dessecados novamente e a massa da amostra foi determinada. A SR e SO foram calculadas a partir dessas medições. Os dados foram analisados por ANOVA e teste de Tukey (p=0,05).TP (n=5) foi determinada através da inserção dos compósitos entre as hastes de polimetilmetacrilato. Os dados analisados por ANOVA e teste de Tukey (p=0,05).Paraa análise de AI (n=4), trinta e dois molares receberam cavidades Classe II e foram restaurados com a técnica incremental ou bloco único. Depois de seccionados perpendicularmente, impressões foram realizadas e réplicas em resina epóxi foram obtidas da superfície interna das restaurações para a análise da formação de fendas através de MEV e os dados foram analisados por ANOVA e teste de Tukey (p=0,05). Para RU (n=8),superfícies de dentina de terceiros molares foram restauradas, seccionadas e armazenadas em água destilada antes do teste de RU. Os dados foram analisados por ANOVA e teste de Tukey (p=0,05). Todas as resinas compostas continham silício, e outros componentes variados. As resinas apresentaram morfologia e tamanhos diferentes de partículas de carga. Filtek Silorane apresentou as menores médias de RS, SR e SO. O armazenamento em água por um ano aumentou a SR para todas as resinas compostas testadas. Filtek Silorane apresentou TP semelhantes aos materiais à base de metacrilato, a menor AI e as maiores médias de RU após um ano de armazenamento. A resina composta de baixa contração Filtek Silorane se mostrou como alternativa aos materiais de formulação convencional, para restauração de dentes posteriores, uma vez que em vários testes realizados ela obteve os melhores resultados
Abstract: The aim of this study were: 1) to characterize the chemical elements and the morphology of filler particles in conventional and low-shrinkage composite resins; 2) to evaluate the surface roughness (SR) and 3) the water sorption (WS) and solubility (SO) after finishing/polishing 24h and after 1 year of water storage; 4) polymerization stress (PS) of the composites; 5) To evaluate the internal adaptation (IA) on Class II cavity walls using incremental and bulk filling restorative technique 24h and one year of water storage and 6) the bond strength (BS) of silorane- and methacrylate-based restorative systems after 24h and one year of water storage to dentin. Four composites were evaluated: two low shrinkage (Filtek Silorane and Aelite LS) and two conventional composites (Heliomolar and Tetric NCeram). For the BS and IA analysis, the adhesives from the same manufacturer were used: Excite for Tetric N-Ceram and Heliomolar; One-Step Plus for Aelite LS and Silorane System Adhesive for Filtek Silorane. To identify the inorganic components and to evaluate the filler particles characteristics, the materials (n=5) were immersed in organic solvents to eliminate the organic phase and observed by SEM and EDX. For the SR evaluation, WS and SO (n=10) their respective finishing and polishing systems were used following the manufacturer instructions. Polished surfaces were analyzed using a profilometer. For the WS and SO, the discs were stored in desiccators until constant mass. Specimens were stored in water and the mass of each specimen was measured. The specimens were dried again and the mass was determined. The WS and SO were calculated from these measurements. Data analyzed by ANOVA and Tukey's test (p=0.05). PS (n=5) was determined by the insertion of the composite between rods of polymethyl methacrylate. Data analyzed by ANOVA and Tukey's test (p=0.05).For IA analysis (n=4), thirty-two molars received Class II cavities and were restoring according to incremental or bulk filling technique. After sectioned perpendicularly, impression were taken and epoxy resin replicas were obtained of the internal surface of restorations to analysis gap formation using scanning electron microscopy (SEM) and the data was analyze by ANOVA and Tukey's test (p=0.05). For BS test (n=8), dentin surfaces of third molars were bonded, sectioned and stored before BS test. Data was analyzed by ANOVA and Tukey's test (p=0.05). All composite resins contained silicon, but the other components varied. The resins showed different filler particle sizes and morphologies. Filtek Silorane showed the lowest SR, WS and SO means. Water storage for one year increased the WS means for all composite resins tested. Filtek Silorane showed the highest means of bond strength after one year of storage, the lowest formation of gaps and PS similarly methacrylates based materials. The composite resin of low shrinkage Filtek Silorane showed as an alternative to conventional composites for restoration of posterior teeth, since in many tests has obtained the best results
Doutorado
Dentística
Doutora em Clínica Odontológica
Silva, Rafael Menezes. "Avaliação clínica randomizada de restaurações de classe II em dentes permanentes de ART e de resina composta." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/25/25148/tde-24052018-180804/.
Full textThis study evaluated the effectiveness of Class II restorations through the Atraumatic Restorative Treatment (ART) technique, with additional retentions in the proximal boxes, in permanent teeth, using high viscosity glass ionomer cement (HVGIC), as compared to restorations of composite resin. An epidemiological examination was conducted in a larger and representative population of the participants of study. One hundred and thirty three participants, aged 8 to 28 years, with good general health with 1 to 2 class II cavities in permanent teeth without pulp involvement and tooth pain were included in this study, with was approved by the Ethics Committee under the number: CAAE: 24012913.0.1001.5417. Seventy-seven restorations were made with each restorative material (Equia Fil-GC Corporation and Z350-3M). Restorations were evaluated at 6, 12, and 24 months by the criteria of ART and the modified United States Public Health Service (USPHS). Spearman Correlation and Multiple Linear Regression were performed between the variables tooth pain, visible plaque index (VPI), gingival bleeding index (GBI) and the CAST (The Caries Assessment Sprectrum and Treatment) and DMFT (Decayed, Missing and Filled teeth) obtained at the epidemiological survey using the Statistica program 7.1. As for restorative effectiveness, data were analyzed using the Mann-Whitnney, Chi-square, Fisher\'s Exact, Chi-square tests with linear trend and Logistic Regression by Enter method, where relevant (p<0.050). The Kaplan-Meier test evaluated the survival rates of the restorations in relation to the ART and modified USPHS criteria. The Log-Rank test compared the survival curves. From the CAST index (1.53; 2.17) it was possible to extract the DMFT (0.58; 1.32) which presented lower specificity and sensitivity in caries detection. The success rates for composite resin restorations were 100% (6 months), 98.7% (12 months) and 91.5% (24 months) for both assessment criteria and for ART restorations were the same for 6 months (98.7%) and 12 months (95.8%) and for 24 months were 92% when using the criteria of modified USPHS and 90.3% when using the criteria of ART, and no statistical difference was observed (p=0.466). The variables gender, locality, age, DMFT, VPI, GBI, toothache, occlusion, proximal contact, cavity size, anesthesia and cooperation of the participant did not present a statistical association with the success rates of the restorations (p>0.050). After 24 months, the VPI and GBI variables did not present a statistically significant odds ratio (OR) for ART restorations (p>0.050). ART restorations presented a lower survival rate by the criteria of ART (83.7%) when compared to the criteria of USPHS modified (87.8%), after 24 months (p=0.051). The survival of composite resin restorations was 90.7% for both evaluation criteria. It was concluded that there is no difference in the success rate of class II restorations of ART with HVGIC, in permanent teeth, with proximal retention grooves, compared to class II resin composite restorations, after 24 months.
Grullón, Patrícia Grau. "Analise ‘in vitro’ do efeito do agente silano em uma resina laboratorial de segunda geração na resistência adesiva ao do substrato dentinário utilizando dois sistemas de cimentos resinosos, por meio do teste de micro-tração." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2005. http://tede2.uepg.br/jspui/handle/prefix/1773.
Full textThe aim of this investigation was to analyze the bond strength between a Second Generation Laboratorial Resin and dentin structure, verifying the effect of the internal treatment with silano agent, using two resin cement systems. The oclusal surface of twenty third human molars was removed and later polished. Blocks were constructed using the Second Generation Laboratorial Resin GradiaTM directly on the dentin structure. The 4 evaluated groups were: I) chemical resin cement sandblasting/silano; II) chemical resin cement sandblasting; III) dual resin cement sandblastings/silano/ and IV) dual resin cement sandblasting. Bonded sticks (0.9 mm² ± 0.2 mm²) were gotten by means of parallel and perpendicular cuts in the bonding interface. Each stick was fixed by its extremities to the modified device for the micro-tensile test in order to locate the area of adhesion perpendicular to the long axle of the force, in the universal assay machine (EMIC) crosshead speed 1mm/min. The final values of bond strength were express in MPa. The fracture modes were analyzed under 40X magnification. The data were submitted to two-way ANOVA and Tukey´s test (α=0.05). Results: The average values in MPa presented by each group were: I) 19.10±2.88; II) 13.67±3.31, III) 11.95±3.96; IV) 25.14±5.66. The analysis two-way ANOVA showed that the factor Treatment was significant (p=0.05), as well as the interaction of the factors Treatment and Type of cement (p=0.0001). The factor Type of cement was not significant (p=0.25). Conclusion: They were not statistical differences between the bond strength of the two resin cements, the internal treatment was significant, for the dual cement the application of the silano agent lowed the values of bond strength in the chemical cement the application of the silano increased the values of adhesive resistance, being not significant. The fracture modes were predominantly adhesive between the Second Generation Laboratorial Resin of and the resin cement.
O objetivo deste trabalho foi analisar a resistência adesiva entre o substrato dentinário e uma Resina Laboratorial de Segunda Geração, verificando o efeito do tratamento interno da peça com agente silano, utilizando dois sistemas de cimentos resinosos. A superfície oclusal de vinte terceiros molares humanos foi removida, e posteriormente polida. Foram confeccionadas peças em forma de blocos, utilizando a resina Laboratorial de Segunda Geração GradiaTM, diretamente sobre a estrutura dentinária. Os 4 grupos avaliados foram: I) jateamento/silano/cimento resinoso químico; II) jateamento/cimento resinoso químico; III) jateamento/silano/cimento resinoso dual e IV) jateamento/cimento resinoso dual. Os espécimes em forma de “palitos” de 0,9 mm² ± 0,2 mm² foram obtidos mediante cortes paralelos e perpendiculares a interface de união. Os “palitos” foram fixado pelas suas extremidades a um dispositivo de modo a posicionar a área de adesão perpendicular ao longo eixo da força de tração em uma máquina de ensaio universal (EMIC) a uma velocidade de 1mm/min. Os modos de fratura foram analisados com lupa esteroscópica (40X). Os dados obtidos foram submetidos à análise de variância para dois critérios e teste de Tukey (α=0,05). Resultados: Os valores médios em MPa apresentados por cada grupo foram: I) 19,10±2,88; II) 13,67±3,31, III) 11,95±3,96; IV) 25,14±5,66. A análise de variância de dois fatores demonstrou que o fator Tratamento da peça foi estatisticamente significante (p=0,05), assim como a interação dos fatores Tratamento da peça e Tipo de cimento (p=0,001). O fator Tipo de cimento não foi estatisticamente significante (p=0,25). Conclusão: Não houve diferenças estatísticas entre os cimentos resinosos testados, o tratamento interno da peça foi estatisticamente significante, para o cimento dual a aplicação do agente silano diminuiu estatisticamente os valores de resistência adesiva e no cimento químico os valores de resistência adesiva foram aumentados pela aplicação do agente silano não sendo estatisticamente significante. As modos de fratura foram predominantemente adesivas entre a Resina Laboratorial de Segunda Geração e o Cimento Resinoso.
Ludovichetti, Francesco Saverio. "CAD/CAM monolithic materials: wear resistance and abrasiveness, and the effect of grinding and polishing on their roughness and fracture resistance." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3424969.
Full textBenetti, Ana Raquel. "Avaliação clínica e laboratorial de resina composta em função da fotoativação com diferentes fontes de luz e densidades de potência." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/25/25131/tde-11102007-100914/.
Full textThe aim of this study was to evaluate the clinical and laboratorial performance of a resin composite light-cured with different light-curing units and power densities, at a standard energy density level. Degree of conversion of the resin composite was determined by Fourier transformed infrared spectroscopy. The degree of softening of the resin composite in ethanol was obtained by Wallace hardness measurements before and after storage in a 75% ethanol solution. Wear of the resin composite was acquired by two methods: ACTA wear and toothbrush abrasion. Additionally, the clinical performance of resin composite restorations submitted to the same light-curing protocols was followed up. Class I resin composite restorations were light-cured using either halogen lamp or light emitting diode at 300 mW/cm2 during 40 seconds or 600 mW/cm2 during 20 seconds. Restorations were evaluated immediately and after 6 and 12 months by two calibrated dentists, according to the modified Ryge criteria. The laboratorial data were submitted to two-way analysis of variance and Newman- Keuls multiple comparison test, or t-test. Clinical data were analyzed by Kappa, Fisher and McNemar tests (\'alpha\' = 0.05). No significant differences were observed for the different light-curing protocols in the degree of conversion, degree of softening in ethanol, and wear produced by the ACTA method (p > 0.05). For the toothbrush abrasion test, irradiation with the light emitting diode unit for 40 seconds at 300 mW/cm2 resulted in higher wear than the other light-curing protocols (p < 0.05). No significant differences were detected at the one-year clinical follow-up of the resin composite restorations submitted to the various light-curing protocols investigated in this study (p > 0.05).
Bicalho, Aline Aredes. "Efeito da contração de polimerização em restaurações diretas em resinas compostas em dentes posteriores." Universidade Federal de Uberlândia, 2014. https://repositorio.ufu.br/handle/123456789/16831.
Full textThe composite resins have been widely used over years in posterior restorations. However, the composite resins have an inherent characteristic called polymerization shrinkage which may be associated with undesirable clinical manifestations such as post-operative sensitivity, microleakage and recurrent caries. The aim of this study was to investigate the influence of some factors such as occlusal loading, restorative technique, mechanical properties of materials, use of liner and environment conditions on the biomechanical behavior of direct composite resin restorations in posterior teeth through laboratory and computational studies. This study was divided into five specific objectives; objective 1: To investigate the effect of occlusal loading and mechanical properties of composites on shrinkage stress in premolars; objective 2: To investigate the effect of environmental conditions, such as temperature and humidity, mechanical properties on biomechanical behavior of molars with class II MOD; objective 3: to investigate the effect of glass ionomer resin liner and filling technique on biomechanical behavior of class II MOD composite resin restoration, specifically analysing cuspal strain by strain gage test, termal and mechanical fatigue and fracture resistance; objective 4: to investigate the effect of the same parameters of objective 3 on mechanical properties of restorative materials, marginal adaptation and shrinkage stress distribution; objetivo 5: To generate an article with all conclusions about shrinkage and posterior restorations by the Brazilian clinical communication contributing with the social function of knowledge generation. The methods used on the all studies were cuspal strain by strain gage test, post-gel measurments by strain gage test, thermal and mechanical fatigue, fracture resistance, marginal adaptation and fracture mode under scanning electron microscopy, dynamic indentation test for calculation of Vickers Hardness and elastic modulus, indentation test for hardness Knoop calculation, finite element analysis 2D and 3D. After data analysis it can be concluded that materials with higher elastic modulus cause greater shrinkage stress; occlusal loading on the margin of restoration cause great stress concentration at interface; occlusal stable contact in the center of restoration cause low stress concentration; high temperature and humidity affect the post-gel shrinkage, elastic modulus, cuspal strain, bond strength and stress shrinkage in the teeth restored with direct composite resins; the simulation of oral environment should be performed in laboratory tests to evaluate the shrinkage and cuspal strain; the order of filling technique, represented by sequence of the oblique increments, had no influence the cuspal strain, fracture resistance, fracture mode, marginal adaptation and stress distribution in molars restored with composite resin; cuspal strain and shrinkage stress decreased significantly with the presence of resin modified glass ionomer resin liner in direct posterior composite resin restorations; the fracture resistance and fracture mode was not influenced by the presence of liner in molars restored with composite resin; gingival margin had higher gap formation than proximal margins in molar restored with direct composite resin restoration.
As resinas compostas tem sido amplamente utilizadas ao longo dos anos nas restaurações de dentes posteriores. No entanto, os materiais resinosos apresentam característica inerente, a contração de polimerização que pode ser associada à manifestações clínicas indesejáveis como sensibilidade pós-operatória, infiltração marginal e cáries recorrentes. O objetivo geral deste estudo foi investigar a influência de fatores como carregamento oclusal, propriedades mecânicas dos materiais, uso de forramento cavitário, condições de ambiente e técnica restauradora no comportamento biomecânico de restaurações em resina composta em dentes posteriores por meio de estudos laboratoriais e computacionais. Este estudo foi dividido em cinco objetivos específicos; objetivo 1: investigar o efeito da condição de carregamento oclusal e das propriedades mecânicas de resinas compostas nas tensões de contração de polimerização de resinas compostas em pré-molares; objetivo 2: investigar o efeito das condições ambientais, determinadas pela temperatura e umidade, nas propriedades mecânicas e no comportamento biomecânico de molares com restaurações diretas extensas em resina composta; objetivo 3: investigar o efeito do uso de base de ionômero de vidro como protetor pulpar e da técnica de inserção de resina composta no comportamento biomecânico de restaurações molares com restaurações diretas extensão em resina composta, especificamente na deformação de cúspide em diferentes momentos e o reflexo na resistência à fratura; objetivo 4: investigar o efeito dos mesmos parâmetros avaliados no objetivo 3 nas propriedades mecânicas dos materiais restauradores, adaptação marginal e geração de tensões de contração de polimerização; objetivo 5: gerar síntese dos achados dos objetivos 1, 2, 3 e 4 em um artigo de comunicação aos clínicos brasileiros cumprindo a função social da geração do conhecimento. Os métodos experimentais utilizados foram extensometria para deformação de cúspide e para cálculo de contração pós-gel, fadiga térmica e mecânica, resistência à fratura, teste de microtração, microscopia eletrônica de varredura para análise de modo de fratura e adaptação marginal, teste de indentação dinâmico para cálculo de dureza Vickers e módulo elástico, teste de indentação para cálculo de dureza Knoop, análise por elementos finitos 2D e 3D. Após análise estatística dos resultados pode-se concluir que materiais com maiores valores de módulo elástico causam maiores tensões de contração; contato oclusal localizado na margem da restauração de resina composta posterior aumentam as tensões geradas na interface; o carregamento oclusal aumenta os níveis de tensões em dentes restaurados mesmo quando utilizados resinas composta de baixos valores de contração de polimerização; contatos oclusais estáveis no centro da restauração resultaram em melhor distribuição de tensões; umidade e temperatura que simulam as condições de ambiente oral afetam significativamente a contração pós-gel, módulo de elasticidade, deformação de cúspide, resistência adesiva e tensões de contração em dentes com restaurações diretas em resinas compostas; simulação do ambiente bucal deve ser realizada nos testes de laboratório para avaliar estes parâmetros biomecânicos; a ordem de preenchimento dos incrementos de resina composta, se iniciado pelas caixas proximais ou pela cúspide vestibular, não influenciou na deformação de cúspide, resistência à fratura, modo de fratura, adaptação marginal e tensões geradas de molares restaurados com resina composta; a deformação de cúspide e as tensões de contração diminuíram com a presença de ionômero de vidro modificado por resina usado como material de proteção do complexo dentinho-pulpar em restaurações posteriores; a resistência à fratura e modo de fratura não foram influenciados pela presença de material de base em molares restaurados com resina composta; a margem restauradora com maior desadaptação em molares classe II MOD é a margem gengival. O clínico deve se ater as condições de controle técnico e fazer uso de materiais restauradores adequados em termos de propriedades mecânicas e contração de polimerização objetivando potencializar o sucesso de restaurações diretas em resina composta em dentes posteriores.
Doutor em Odontologia
Souza, Fábio Herrmann Coelho de. "Efeito da técnica restauradora, do tipo de preparo e do envelhecimento de restaurações de resina composta sobre a resistência à fratura dental, resistência adesiva e vedamento marginal." Universidade Federal de Pelotas, 2006. http://repositorio.ufpel.edu.br/handle/ri/2307.
Full textThe aim of this study was to evaluate, in vitro, the effect of composite resin restoration techniques, bevel and storage time on the fracture strength, restoration retention and gap formation. For the fracture strength test, standard MOD cavities were prepared in 100 upper premolars, which were divided in two storage times (24 hours and 6 months with 1000 thermocycles), and in each group, sub-groups were randomly formed as follow: group 1 direct composite resin restoration(Filtek Z250 and Adper Single Bond 3M/ESPE) without bevel (butt joint); group 2 beveled direct composite resin restoration; group 3 indirect composite resin inlay (Z250 and Rely X ARC 3M/ESPE) without bevel(butt joint); group 4 beveled indirect composite resin inlay; group 5 sound teeth; group 6 teeth with MOD preparations (no restorations). For the retention test, the incisal edge of 90 lower incisors was sectioned, and divided in the same restorative groups as described above (except group 6). To evaluate gap presence or absence, proximal box cavities were prepared in 24 human third molars, which were restored with direct or indirect composite restorations, with or without bevel, similar to above described and examined under SEM evaluation. Data was statistically analysed by A NOVA, Tukey and t-student tests for fracture strength and retention tests, and Fisher s exact test for gap formation (=0,05). At the 24 hours, beveled restorations exhibited higher fracture strength values than non beveled restorations and most of the tested groups showed resistance similar or superior than sound teeth. After 6 months, the best results were obtained for beveled inlays and the worst values were observed for butt joint direct restorations. In the retention test,beveled restorations had superior performances than non-beveled restorations, in both periods of time. For both tests, a 6-month storage time and thermal cycling produced significant properties decrease in groups 1, 2 and 4 showed. Under SEM examination, no difference was observed among groups after 24 hours. However,after 6 months, beveled restotations remained without gap formation and they had better performance than butt joint restorations. Pearson correlation test showed positive correlation between fracture strength and retention tests. Within the limitations of the study, it was concluded that aging impaired adhesive properties, bevel improved the performance in all tests and generally indirect restorations were not superior to direct restorations.
O objetivo do presente trabalho foi avaliar in vitro o efeito da técnica restauradora, da confecção de bisel e do tempo de armazenamento de restaurações de resina composta sobre a resistência à fratura dental, resistência à fratura de restaurações (resistência adesiva) e formação de fenda marginal. Para o teste de resistência à fratura dental, foram utilizados 100 pré-molares superiores, submetidos a preparos cavitários MOD, divididos em 2 tempos de armazenamento (24 horas e 6 meses com termociclagem 1000 ciclos), subdivididos nos seguintes grupos: grupo 1 restaurados com resina composta direta (Filtek Z250 e Adper Single Bond 3M/ESPE) sem bisel; grupo 2 resina composta direta com bisel; grupo 3 resina composta semi-direta (Z250 e Rely X ARC 3M/ESPE) sem bisel; grupo 4 resina composta semi-direta com bisel; grupo 5 dentes hígidos; e grupo 6 dentes apenas preparados (n=10). Para o teste de resistência à fratura de restaurações, foram utilizados 90 incisivos inferiores, que receberam desgaste do bordo incisal e foram divididos nos mesmos grupos citados acima (exceto o grupo 6). Para a avaliação de presença ou ausência de fenda marginal,foram empregados 24 terceiros molares, que receberam preparos proximais, divididos nos mesmos grupos acima (exceto os grupos 5 e 6). Os dados foram submetidos à análise estatística (=0,05) através dos testes ANOVA, Tukey e t-student para resistência à fratura dental e resistência à fratura de restaurações e teste exato de Fisher para formação de fenda marginal. Os resultados mostraram que, para resistência à fratura dental, no tempo de 24 horas, as restaurações com bisel foram superiores às demais, enquanto as sem bisel não diferiram dos dentes hígidos. Após 6 meses, as restaurações semi-diretas com bisel foram superiores às demais, não diferindo das semi-diretas sem bisel; as restaurações diretas sem bisel foram inferiores às demais. Para resistência à fratura de restaurações, as restaurações com bisel foram superiores às demais para ambos os tempos de armazenamento, e não diferiram dos dentes hígidos em 24 horas. Para os 2 testes citados, os grupos 1, 2 e 4 apresentaram redução significativa do seu desempenho após 6 meses de armazenamento e termociclagem. A avaliação de fenda em esmalte mostrou que em 24 horas não houve diferença entre os grupos. Após 6 meses, as restaurações com bisel continuaram livres de fenda, enquanto as sem bisel apresentaram fenda na maioria dos espécimes. A análise de correlação de Pearson mostrou resultado significativamente positivo para os 2 testes de resistência. Concluiu-se que o tempo de armazenamento e termociclagem foram fatores significativos na redução da performance adesiva; a realização de bisel influenciou de forma positiva na melhora do desempenho das restaurações em todos os testes empregados; as restaurações semi-diretas de resina composta, de modo geral, não foram superiores às diretas.
Teixeira, Nancielli. "Influência de diferentes resinas compostas e técnicas de polimento sobre os tecidos periodontais próximos a lesões cervicais não cariosas avaliação clínica randomizada." Universidade Estadual do Oeste do Parana, 2015. http://tede.unioeste.br:8080/tede/handle/tede/734.
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The aim of this study was to evaluate the influence of different composite resins and technical polishing and finishing over periodontals tissues and gingival crevicular fluid in cervical lesions restorations noncarious (LCNC). Initially were evaluated 272 teeths of patients with complaints related to LCNC and, acordding to the inclusion and exclusion criteria were selected 60 teeths for elegibility. Each tooth received a restoration with a kind of composite resin (Resin Tetric N-Ceram® or Resin Z350 XT®) in both quadrants, varying the polishing technique ( Astropol® Polishing rubber or Sof-lex® Disks). Periodontal tissues analysis, the longitudinal evaluation of restaurations and the gengival crevicular fluid collect were taken prior to scalling and root planning and also at 30, 60, 120 and 180 days of restaurations making. After the data collection and tabulation , these were submited to the Friedman test, with a significance level of 5%. The results revealed that resins and polishing techniques applied in this study showed no estatistical differences at the end of follow-up in any of the analyzes. However all groups evaluated showed differences between the initial and final times (p <0.05). From the results obtained it was concluded that regardless of the restorative material or polishing technique, the restoration of LCNC cavities improved the periodontal health of patients
O objetivo desse trabalho foi avaliar a influência de diferentes resinas compostas e técnicas de acabamento e polimento sobre os tecidos periodontais e o fluído crevicular gengival em restaurações de lesões cervicais não cariosas. Foram avaliados inicialmente 272 dentes de pacientes com queixas relacionadas à LCNC e, a partir dos critérios de inclusão e exclusão definidos, foram selecionados para elegibilidade 60 dentes, divididos em 4 grupos com N:15 dentes. Cada dente recebeu restauração com um tipo de resina composta nanoparticulada (Resina Tetric N-Ceram® ou Resina Z350 XT®) nos dois hemiarcos, variando a técnica de polimento (Borrachas de polimento Astropol® ou Discos Sof-lex®). A análise periodontal dos tecidos, a avaliação longitudinal das restaurações e a coleta do fluido crevicular gengival foram realizadas antes da raspagem e alisamento corono-radicular, e também aos 30, 60, 120 e 180 dias após a confecção das restaurações. Após a obtenção e tabulação dos dados, esses foram submetidos ao teste de Friedman, com nível de significância de 5%. Os resultados revelaram que as resinas e as técnicas de polimento utilizadas neste estudo não apresentaram diferenças estatísticas ao final do período de acompanhamento em nenhuma das análises. Porém, todos os grupos avaliados apresentaram diferenças entre os tempos iniciais e finais (p<0,05). A partir dos resultados obtidos foi possível concluir que, independente do material restaurador ou da técnica de polimentos utilizada, a restauração das cavidades de LCNC proporcionou melhora da saúde periodontal dos pacientes
Shimokawa, Carlos Alberto Kenji. "Comparação in vitro de parâmetros para fotoativação de restaurações em resina composta por meio de microdureza e microscopia eletrônica de varredura." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/23/23134/tde-13122013-164138/.
Full textThis in vitro study aimed to compare different protocols for the photoactivation of composite resin restorations using microhardness test and analysis of marginal adaptation with scanning electron microscopy. Restorations with 2mmx4mmx2mm were made in 30 bovine teeth using the composite resin Premisa (Kerr). During the restorative procedure, the polymerization method had change, being one group activated with the continuous method (control group) for 20 seconds using the curing unit Elipar Freelight 2, another group used the same curing unit equipment, varying the distance from the activator tip in order to promote a soft-start method (soft-start group), with initial distance of 6mm for 20 seconds, followed by minimum distance for 10 seconds, and a third group used technology PLS (DEMI group) supplied from the DEMI, which provides a pulsed light and allows an adequate polymerization of a resin composite in 5 seconds (according to manufacturer). 24 hours after restoration, maintained at 37 ° C, the teeth were sectioned incisocervical towards resulting in 60 specimens, half of them being used in each test (N = 10). The halves were sanded on the transversal section surfaces to obtain flat and polished surfaces, of which 30 were randomly selected for Knoop microhardness testing in 3 different depths and the other 30 halves were replicated in epoxy resin for microscopy scanning electron reading. Measures of percentage of perimeter with marginal desadaptation and width of the largest slot found were made with the obtained images. Split plot analysis of variance tests were applied to hardness results and one way to the marginal adaptation. Regarding the hardness, tests showed no statistically significant difference among the groups, while there were differences at different depths (p<0,0001), being the hardness of the deep region highest than the medium, which was higher than the superficial. For marginal adaptation, tests showed no statistically significant difference for the width of the largest slot found between the control group and DEMI, only the soft-start group was different from the other groups (p=0,0064), having the lowest values. Despite the large standard deviations shown by the percentage of perimeter with marginal desadaptation, statistically significant difference was found between the control and DEMI, but not between groups DEMI and soft-start. The Pearson correlation test showed positive linear correlation between the width of the largest slot found and the percentage of perimeter with marginal desadaptation. It was possible to conclude that the soft-start photoactivation protocol improved the marginal adaptation of composite resin restorations, without changing the hardness of the material; DEMI curing unit equipment, using PLS technology, showed no statistically significant difference in the evaluation of marginal adaptation, comparing with the control group; none of the protocols tested photoactivation caused change in hardness of composite resin when compared to each other, with an increase of this property as the depth increased.