Carvalho, Adriana OliveiraAyres, Ana PaulaalmeidaAlmeida, LetÍcia Cunhaamaral Gonzaga de [UNESP]Briso, André Luiz Fraga [UNESP]Rueggeberg, Frederick AllenGiannini, Marcelo2016-01-282016-01-282015European Journal of Dentistry, v. 9, n. 2, p. 246-250, 2015.1305-7456http://hdl.handle.net/11449/133518Objective: This study evaluated the effects of carbamide peroxide and hydrogen peroxide on the biaxial flexural strength and flexural modulus of bovine dentin. Materials and Methods: Thirty coronal dentin disks (0.5 mm thick × 6.0 mm diameter) were prepared from bovine teeth. The disks were randomly divided into three groups (n=10): A control group (unbleached), a group bleached with 10% carbamide peroxide (8 h at 37°C), and a group bleached with 38% hydrogen peroxide (three 10 min applications at 37°C). The specimens were tested in a biaxial flexural apparatus held in a universal testing machine at 1.27 mm/min until failure occurred, and the biaxial mechanical properties were calculated. For each test parameter, the data were statistically analyzed by Fisher's PLSD test (predetermined a = 0.05). Results: The group bleached with 38% hydrogen peroxide demonstrated significantly lower flexural strength than the unbleached control group. Hydrogen peroxide treatment resulted in a significantly lower flexural modulus compared with the control group and with carbamide peroxide bleaching. Conclusion: Exposure of dentin to hydrogen peroxide significantly reduced both the flexural strength and the flexural modulus compared with the no-treatment control, whereas exposure to carbamide peroxide did not significantly affect either parameter.246-250engBiaxial flexural strengthBleachingCarbamide peroxideDentinFlexural modulusHydrogen peroxideArtigo10.4103/1305-7456.156845Acesso restrito5761956467234702