Avaliação da rugosidade superficial de uma resina composta convencional e de uma Bulk Fill de alta viscosidade após clareamento

Abstract

The aim of this study was to evaluate a surface roughness of a high viscosity Bulk Fill composite resin and a nanoparticulate composite resin after exposure to the Carbamide Whitening agent by 22%. Ten specimens measuring 6 mm in diameter and 2 mm in thickness were made from a Filtek Z350 XT (GA) resin and 10 of a Tetra - N - Ceram Bulk Fill (GB) resin in a Teflon matrix. Then they were polished with sandpaper discs and stored in water, separately. The surface roughness was verified in the center of the CP and one side, through a rugosimeter, measured in Ra. Whiteness Perfect at 22% on the surface for 1 hour for 14 consecutive days and then a new surface roughness reading (T2) was performed. The data related to the statistical program SPSS version 20.0 and the roughness values were submitted to descriptive and inferential statistical analysis, using the paired T test and the independent T test, with independent variable and with a significance level of P <0.05. The initial surface roughness value of Filtek Z 350 XT was 0.34 μm and a final value of 0.49 μm; Which is the initial of the Tetric-N-Ceram Bulk Fill to 0.36 μm and a final of 0.63 μm. The T test for independent samples with significance level p> 0.05 showed no significant increase in roughness (p = 0.089). The paired T test where GA and GB had comparing T1 and T2 p <0.05; And in the same paired T test, GA p <0.05 and GB p> 0.05, where a significance level of 5% was presented in all tests. Based on these results, it can be concluded that comparatively, as two resins are not in significant difficulties of surface roughness, when they are submitted to Whiteness Perfect Whitening agent at 22%.