Evaluation of surface roughness of chemically activated acrylic resin and bisacryl

Abstract

Objective: the aim of this study was to evaluate the surface roughness of Chemically Activated Acrylic Resin (CAAR) and Bysacril Resin used for temporary crown construction, with different techniques of manipulation. Materials and methods: silicone matrixes (20x10x3mm) were built and served for preparation of specimens, which formed 4 groups: Pressurized Pot Group, Bead Brush Group, Manufacturer's Group and Bisacryl Group (n = 12). After polymerization, 3 longitudinal and 3 transversal readings were performed with the aid of a digital rugosimeter. The readings were repeated after finishing and polishing of the specimens in a Metallographic polishing machine. The roughness values were added and an average was created for each specimen, who was grouped again within each group creating an average and standard deviation, before and after they were polished. The data were submitted to a two-way ANOVA test and Sidak's multiple comparisons test (P < 0.05). Results: It was observed that there is influence between manipulation technique and type of acrylic resin on property of surface roughness. Among the groups, Bisacryl demonstrated smaller values of roughness, however other groups have shown an improvement of surface roughness after they were polished. Conclusion: There is a direct influence between the technique of manipulation and commercial brand in the surface’s roughness properties, showing that polishing is needed in order to acrylic resins achieve ideal roughness, independently of the chosen technique or commercial brand.