Efeito da fumaça de cigarro nas propriedades de resinas compostas e substratos dentais

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Análise in vitro da resistência adesiva de resinas compostas em cavidades de classe II, através do teste de microtração. Efeito de diferentes técnicas restauradoras

Pós-graduação em Ciências Odontológicas - FOAR

Resistência de união de reparos de resinas compostas nanoparticuladas e nanohíbridas

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Processo e equipamento de determinacão de desgaste de resinas compostas

Processo e equipamento de determinacão de desgaste de resinas compostas. O primeiro compreendido pelas etapas de: revestir uma superfície fixa com a resina a ser analisada, definindo uma camada superficial de resina a ser submetida a pressão dinâmica...

Estudo da infiltração marginal em restaurações de resinas compostas para dentes posteriores: efeito de material, preparo cavitário e condicionamento do esmalte a nível cervical

Pós-graduação em Odontologia Restauradora - ICT

Análise comparativa da rugosidade superficial de resinas compostas de alta densidade

The success achieved by the use of composite resins in anterior teeth precipitately leads their use in posterior teeth. However, the indiscriminate application of these materials in cavities with several diverse sizes rapidly pointed out their lack of resistance to oclusal and proximal wear. OBJECTIVE: To evaluate the surface roughness of composite resin in relation to finishing and polishing technique. MATERIAL AND METHODS: Eight experimental groups (n = 15) were divided according to finishing and polishing technique: G1 – Z250TM composite resin without surface finishing and polishing; G2 – Z250TM composite resin plus surface finishing and polishing; G3 – P60TM composite resin without surface finishing and polishing; G4 – P60TM composite resin plus surface finishing and polishing; G5 – Prodigy CondensableTM composite resin without surface finishing and polishing; G6 – Prodigy CondensableTM composite resin plus surface finishing and polishing; G7 – SurefillTM composite resin without surface finishing and polishing; G8 – SurefillTM composite resin plus surface finishing and polishing. Three packable and one microhybrid (control group) composite resin was used. The surface roughness was measured using a profilometer at three points in each sample. The results were evaluated by ANOVA and Tukey test (p < 0.05). RESULTS: Prodigy CondensableTM composite resin showed the lowest surface roughness, while SurefillTM showed the highest surface roughness. Comparing the resins used, only between P60TM and SurefillTM there were no statistically significant differences (p > 0,05). CONCLUSION: Surface roughness was lower in all types of resin composites surfaces in contact with Mylar matrix strip than in areas submitted to finishing and polishing procedure.

Contração de polimerização e expansão higroscópica de resinas compostas: análise pela técnica de video-imagem

To evaluate the volumetric changes due to polymerization and thermocycling on different resin-composites. Methods: Thirteen A2 Universal Dentin shade resin-composites (n = 10) from eight manufacturers were evaluated (4Seasons, Grandio, Venus, Amelogen Plus, P90, Z350, Esthet-X, Amaris, Vita-l-escence, Natural-Look, Charisma, Z250 and Opallis). The polymerization shrinkage percentage (PS) was calculated using an image measurement device (ACUVOL - Bisco Dental). Equal volumes of material, standardized by a semisphere polyurethane matrix (d = 3mm) were used and, after 5 minutes of relaxation, the baseline volume measurements were obtained with 18 J of energy dose from the LED light-curing unit. Measurements were obtained after 5 minutes and PS values calculated. Specimens were stored in a drydark environment for 24 hours and re-measured. Specimens were then thermocycled in distilled water between 5oC and 55oC for 20,000 cycles, subjected to another volume measurement at 5,000 cycle intervals. Specimens were gently dried prior to each measurement. Results: Repeated measurements were made using ANOVA (α = 0.05) showed that all resin-composite volumes were influenced by the number of cycles. Volumes at 5 minutes post-polymerization (12.47 ± 0.08) were significantly lower than those at baseline (12.80 ± 0.09). Volumes at 24 hours (12.43 ± 0.19) were insignificantly lower than those at 5 minutes postpolymerization. With regards to the impact of thermocycling, all specimens showed statistically significant increases in volume after 5,000 cycles (13.04 ± 0.22). Although statistically different from those after 5,000 cycles, there was no statistically significant difference between volumes measured at 10,000 (12.87±0.21), 15,000 (12.92±0.24), and 20,000 (12.84±0.23) cycles. Conclusion: According to the video-imaging analysis, thermocycling caused a significant expansion in resin-composites tested, the volume increase was not able to...

Alteração cromática de resinas compostas laboratoriais submetidas à imersão em diferentes soluções

The pigmentation of indirect composite resins has been one of the most common reasons that lead the restorative treatment to failure. The purpose of this study was to investigate the effect of different solutions on color stability of indirect composite resins. Five brands of indirect composite resins were tested: Adoro, Resilab, Cristobal, Sinfony and Epricord. The samples were immerged in eleven solutions (n=10): common liquid foods (coke soft drink, red wine, coffee and orange juice), mounthrinses (Listerine, Oral-B, Colgate Plax and Periogard) and bleaching agents (carbamide peroxide 16%, 7.5% and hydrogen peroxide 38%) and artificial saliva (control group). The color was measured by a spectrophotometer before and after 7, 14 and 21 days of immersion in common liquid foods, after 12, 24, 36 and 60 hours of immersion in mounthrinses and after 7 and 14 days of immersion in bleaching agents. The Cristobal and Adoro resins showed highest values of ΔE statistically significant compared to the others resin brands. Adoro’s ΔE values changed significantly after the immersion process in red wine and coffee and also between periods measured. The resins Cristobal and Sinfony showed the highest values of ΔE after the immersion process in Listerine with difference statistically significant in comparison to control group. Besides, there was difference statistically significant of the ΔE values  for  Cristobal  after  immersion  in hydrogen peroxide 7,5% in comparison to control group. It can be conclude that all the solutions promoted color change on the indirect composite resins. However, ΔE values  are  whitin  the  values clinically acceptable.

Avaliação da resistência de união de reparos em resinas compostas convencionais e bulkfill

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Influência da distância de fotopolimerização e da glicerina na estabilidade da cor das resinas compostas

Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz

Influência da clorhexidina como inibidor das metaloproteinases na alteração da cor das resinas compostas

Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz

Efeito de cinco colutórios na morfologia de superfície e características óticas de restaurações diretas com dois tipos de resinas compostas

Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz

Avaliação da fluorescência de duas resinas compostas após imersão em soluções pigmentantes

Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz

Rugosidade de superfície de resinas compostas: diferentes procedimentos de polimento e acabamento

Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz