DIFERENTES CONCENTRAÇÕES DE PERÓXIDO DE HIDROGÊNIO AFETAM A RUGOSIDADE E MICRODUREZA DE RESINAS UNICROMÁTICAS?

Abstract

Tooth whitening is increasingly recommended in dental treatment planning due to its ability to remove extrinsic pigments, combined with its conservative nature and cost-effectiveness. However, color perception is subjective and varies between individuals, making shade selection a complex process. To address this, various tools and materials have been developed to assist in shade matching and color manipulation, with composite resins being a prominent example. This study aimed to evaluate the microhardness and surface roughness of a single-shade resin after immediate bleaching with 16% and 35% carbamide peroxide containing calcium. Forty specimens were prepared and divided into four experimental groups of 10 samples each. Roughness and microhardness tests were performed for all groups. The results showed that groups G1 and G2 exhibited equivalent microhardness means, which were significantly higher than those of groups G3 and G4, subjected to lower concentrations. Additionally, the single-shade resins demonstrated a significant increase in surface roughness and microhardness when exposed to both high and low concentrations of hydrogen peroxide.