Otro
Effect of carbamide peroxide bleaching gel on composite resin flexural strength and microhardness
Registro en:
Brazilian Dental Journal, v. 24, n. 3, p. 263-266, 2013.
0103-6440
1806-4760
10.1590/0103-6440201302155
S0103-6440201302155
2-s2.0-84881512166.pdf
2-s2.0-84881512166
Autor
Hatanaka, Gabriel Rodrigues
Abi-Rached, Filipe de Oliveira
de Almeida-Júnior, Antonio Alves
Cruz, Carlos Alberto dos Santos
Resumen
This study investigated the effect of 16% carbamide peroxide (Whiteness Perfect/FGM) on the Vickers microhardness and flexural strength of the restorative composites Filtek Z100 (hybrid), Filtek Z350 (nanofill), Brilliant (micro-hybrid) and Opallis (micro-hybrid). Discshaped (4×2 mm; n=5) and bar-shaped (12×2×1 mm; n=10) specimens of each restorative material were randomly divided into 2 groups: (G1) 16 weeks stored in distilled water; (G2) 16 weeks stored in distilled water, with 16% carbamide peroxide application during 6 h per day for the last 4 weeks. The mechanical properties were evaluated using a Vickers microhardness tester and a mechanical testing machine. Data were analyzed by twoway ANOVA and Tukey's (HSD) post-hoc test (α=0.05). Filtek Z100 presented the highest microhardness value, followed by Filtek Z350 and finally by Brilliant and Opallis (p=0.00). Filtek Z100 and Brilliant exhibited the highest flexural strength value, followed by Filtek Z350 and Opallis (p=0.00). Bleaching treatment decreased significantly microhardness of Brilliant and Opallis (p=0.00). The flexural strength of all studied materials was not affected by the home bleaching (p=0.28).