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

Autor:	Carvalho AO; Department of Restorative Dentistry, Operative Dentistry Division, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil., Ayres APA; Department of Restorative Dentistry, Operative Dentistry Division, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil., de Almeida LCAG; Department of Restorative Dentistry, Operative Dentistry Division, Araçatuba Dental School, São Paulo State University, Araçatuba, SP, Brazil., Briso ALF; Department of Restorative Dentistry, Operative Dentistry Division, Araçatuba Dental School, São Paulo State University, Araçatuba, SP, Brazil., Rueggeberg FA; Department of Oral Rehabilitation, Dental Materials Section, College of Dental Medicine, Georgia Regents University, Augusta, GA, USA., Giannini M; Department of Restorative Dentistry, Operative Dentistry Division, Piracicaba Dental School, State University of Campinas, Piracicaba, SP, Brazil.
Jazyk:	angličtina
Zdroj:	European journal of dentistry [Eur J Dent] 2015 Apr-Jun; Vol. 9 (2), pp. 246-250.
DOI:	10.4103/1305-7456.156845
Abstrakt:	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 α = 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.
Databáze:	MEDLINE
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