TY - JOUR
T1 - Effect of peroxide bleaching on the biaxial flexural strength and modulus of bovine dentin
AU - Carvalho, Adriana Oliveira
AU - Almeida Ayres, Ana Paula
AU - de Almeida, Letícia Cunha Amaral Gonzaga
AU - Fraga Briso, André Luiz
AU - Rueggeberg, Frederick Allen
AU - Giannini, Marcelo
N1 - Publisher Copyright:
© 2015 Dental Investigations Society.
PY - 2015
Y1 - 2015
N2 - Objective: 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 10min 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.
AB - Objective: 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 10min 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.
KW - Biaxial flexural strength
KW - Bleaching
KW - Carbamide peroxide
KW - Dentin
KW - Flexural modulus
KW - Hydrogen peroxide
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U2 - 10.4103/1305-7456.156845
DO - 10.4103/1305-7456.156845
M3 - Article
AN - SCOPUS:84929311862
SN - 1305-7456
VL - 9
SP - 246
EP - 250
JO - European Journal of Dentistry
JF - European Journal of Dentistry
IS - 2
ER -