Efeito de diferentes técnicas de reparo para restaurações provisórias antes e após termociclagem.

• Autor(a) principal: Coelho, Beatryce dos Santos Sanchez [UNESP]
• Data de Publicação: 2020
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/213654
• topic: Acrylic resins; Resinas acrílicas; Restauração dentária temporária; Módulo de elasticidade

Temporary restorations are of paramount importance for success in the Fixed Partial Prosthesis. Thus, the choice of materials to be used for this stage must take into account mainly the physical-mechanical aspects. In order to minimize the disadvantages of polymethylmethacrylate based resins, appear as bisacrylic resins, offer low polymerization shrinkage, low exothermic low reaction, good wear resistance and resistance. However, they are expensive and difficult to carry out repairs.The repairs can have different mechanical behaviors, due to the interface between the provisional and restorative material. Therefore, the present study aimed to evaluate the flexural strength (RF) and the modulus of elasticity (ME) of different types of resins used for making provisionals before and after different repair and thermal cycling techniques. The study had four factors under analysis: (1) different resins for temporary restorations (RAT - thermosetting acrylic resin, RAA - self-curing acrylic resin and RB - nanoparticulate bisacrylic resin); (2) repair techniques: (2.1) RTT repaired with RAA, (2.2) RAA repaired with RAA, (2.3) RB repaired with fluid composite resin; (3) aging through different tests: (3.1) Control (C): distilled water at 37oC for 24 hours and (3.2) thermal cycling (CT) of 833 cycles, from 5 to 55oC for 30 seconds; (4) analysis times at 4 levels: T1 - after storage in distilled water for 24 hours (Control), T2 - after CT and T3 - after repair and new T1 and T2 cycles. Two response variables were considered: (1) flexural strength and (2) modulus of elasticity. The data obtained were submitted to Anova 2 factors (material and period) and to the Post-hoc Tukey test with a significance level of 5%. The RAT group presented the highest RF values, in all periods analyzed. The RAA group had the lowest RF values before repair, while the RB group had the lowest values after repair, in both ages.Still, after the repair, there was a statistically significant decrease in the RF values of all materials, especially the RB. The RAT showed higher ME values at all times, except after cycling with repair, whereas the RB showed higher values. The lowest ME values belonged to AAR, regardless of the period analyzed. It can be concluded that, in general, the thermosetting acrylic resin repaired with self-curing acrylic resin showed the best results.