Resumo

CAMPOS, Isabella Carla M. de et al. Effect of different bleaching agents on surface roughness of composite resins. Odontol. Clín.-Cient. (Online) [online]. 2011, vol.10, n.3, pp. 271-276. ISSN 1677-3888.

This study evaluated the effect of bleaching agents on surface roughness of composite resins (RC). 50-of-body were made and divided into 10 groups (n=5). In Groups G1 to G5 was used Opallis (a microhybrid RC), and in G6 to G10 Brilliant NewLine (a nanohybrid RC) was used. The bleaching agents were: PH-35% hydrogen peroxide (HP Max Whiteness) and PC-Carbamide peroxide 37% (Whiteness Super). After 24 hours, bleaching was performed: G1 and G6-without bleaching agent (control), G2 and G7-one session with three applications of PH, G3 and G8-two sessions of three applications of HP, G4 and G9-one session with three applications of PC and G5 and G10-two sessions of three applications of PC. After bleaching, specimens were evaluated in a roughness meter. Data were analyzed by ANOVA and Bonferroni's test (α=0.05). The results of surface roughness (μm) were: G1-0.07 ± 0.02, G2-0.12 ± 0.04, G3-0.40 ± 0.33, G4-0.49 ± 0.65; G5-1.33 ± 1.76; G6-2.03 ± 1.22; G7-1.15 ± 0.46; G8-1.33 ± 1.24; G9-0.56 ± 0.59 and G10-1.87 ± 1.31. The results showed that Opallis roughness values increased after bleaching and Brilliant NewLine values decreased. It was concluded that the use of bleaching agents affected the roughness of composite resins tested.

Palavras-chave : Surface properties; Composite resins; Bleaching agents..