Resumo (EN)
Objective – To evaluate the microhardness and surface roughness of a resin-based microhybrid silorano, subjected to bleaching with hydrogen peroxide 35%, self-catalyzed, containing calcium. Methods – There was prepared 30 specimens, divided into three groups: Group 1 (n = 10): composite without bleaching treatment, Group 2 (n = 10): composite subjected to two sessions immediately bleaching with hydrogen peroxide 35%, Group 3 (n = 10): composite subjected to two sessions immediately bleaching with hydrogen peroxide to 35% with calcium and stored for 7 days at 37°C in artificial saliva. Tests of roughness and hardness were performed for all groups. Results– Data were evaluated by analysis of variance at a significance level of 5%, complemented by the Tukey test. There was no significant difference between groups in terms of roughness (p = 0.481), although the average of the control was higher than the other groups. On the other hand, significant differences between groups in terms of microhardness (p = 0.007) were observed. The groups G1 and G2 showed average microhardness equivalent and significantly higher than the average of the group G3. Conclusion – It can be concluded that, after bleaching with hydrogen peroxide containing 35% calcium, the surface roughness of the resin did not change and microhardness decreased after one week storage in artificial saliva.