Effect of peroxide bleaching on the biaxial flexural strength and modulus of bovine dentin

Adriana Oliveira Carvalho, Ana Paula Almeida Ayres, Letícia Cunha Amaral Gonzaga de Almeida, André Luiz Fraga Briso, Frederick Allen Rueggeberg, Marcelo Giannini

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)246-250
Number of pages5
JournalEuropean Journal of Dentistry
Volume9
Issue number2
DOIs
StatePublished - Jan 1 2015

Keywords

  • Biaxial flexural strength
  • Bleaching
  • Carbamide peroxide
  • Dentin
  • Flexural modulus
  • Hydrogen peroxide

ASJC Scopus subject areas

  • Dentistry(all)

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  • Cite this

    Carvalho, A. O., Almeida Ayres, A. P., de Almeida, L. C. A. G., Fraga Briso, A. L., Rueggeberg, F. A., & Giannini, M. (2015). Effect of peroxide bleaching on the biaxial flexural strength and modulus of bovine dentin. European Journal of Dentistry, 9(2), 246-250. https://doi.org/10.4103/1305-7456.156845