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Effect of peroxide bleaching on the biaxial flexural strength and modulus of bovine dentin
  • Universidade Estadual de Campinas (UNICAMP)
  • Universidade Estadual Paulista (UNESP)
  • Georgia Regents University
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Fundação Amparo à Pesquisa Estado de São Paulo (FAPESP)
Sponsorship Process Number: 
  • CAPES: 3110/2010
  • CNPq: 305777/2010-6
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 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.
Issue Date: 
European Journal of Dentistry, v. 9, n. 2, p. 246-250, 2015.
Time Duration: 
  • Biaxial flexural strength
  • Bleaching
  • Carbamide peroxide
  • Dentin
  • Flexural modulus
  • Hydrogen peroxide
Access Rights: 
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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