Avaliação da microdureza de resinas bulkfill em diferentes espessuras

Abstract

The purpose of this work is to evaluate the effectiveness of bulkfill polymerization in different thicknesses (2, 4 and 6 mm). Two composites of the bulkfill type were used for the materials and methods: 2 groups (n = 6) were made for each type of composite resin. For the determination of the microhardness values of 2mm (superior), 4mm and 6mm (base), 4 edentulous per layer were performed on the surface of the composite resin with 1kg / f for the time of 10s. The mean values of the microhardness values of each layer were tabulated and submitted to ANOVA and complemented by Tukey's test (p <0.05). The OPUS composite bulk resin presented values of 55.7; 53.1 and 48.4 for 2mm, 4mm and 6mm, respectively. The composite resin AURA bulkfill presented values of 56.7, 55.3 and 51.1 for 2mm, 4mm and 6mm, respectively. Significant difference was observed when the means of each group were compared between yes and between groups (p = 0.001). Only for 2mm (Aura) and 4mm (OPUS), the Tukey test did not identify a significant difference. Although they presented differences in relation to hardness, all the samples obtained polymerization efficacy in different thicknesses (average 0.8). Conclusion: polymerization efficiency in different thicknesses (2mm, 4mm and 6mm) was observed in the two resins studied, based on the microhardness ratio between base / top.