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International Journal of Dentistry
Volume 2012 (2012), Article ID 347848, 6 pages
http://dx.doi.org/10.1155/2012/347848
Research Article

Bleaching Gels Containing Calcium and Fluoride: Effect on Enamel Erosion Susceptibility

1Department of Restorative Dentistry, School of Dentistry, Universidade Estadual Paulista (UNESP), São José dos Campos, Av. Francisco José Longo, 777, 12245-000 São José dos Campos, SP, Brazil
2Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo (USP), Alameda Octavio Pinheiro Brisola, 9-75, 17012-901 Bauru, SP, Brazil

Received 24 May 2012; Revised 23 July 2012; Accepted 13 August 2012

Academic Editor: Alix Young

Copyright © 2012 Alessandra B. Borges et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This in vitro study evaluated the effect of 35% hydrogen peroxide (HP) bleaching gel modified or not by the addition of calcium and fluoride on enamel susceptibility to erosion. Bovine enamel samples (3 mm in diameter) were divided into four groups ( ) according to the bleaching agent: control—without bleaching (C); 35% hydrogen peroxide (HP); 35% HP with the addition of 2% calcium gluconate (HP + Ca); 35% HP with the addition of 0.6% sodium fluoride (HP + F). The bleaching gels were applied on the enamel surface for 40 min, and the specimens were subjected to erosive challenge with Sprite Zero and remineralization with artificial saliva for 5 days. Enamel wear was assessed using profilometry. The data were analyzed by ANOVA/ Tukey’s test ( ). There were significant differences among the groups ( ). The most enamel wear was seen for C ( μm), followed by HP ( μm) and HP + F ( μm). HP + Ca ( μm) was the only group able to significantly reduce enamel erosion compared to C. The application of HP bleaching agent did not increase the enamel susceptibility to erosion. However, the addition of calcium gluconate to the HP gel resulted in reduced susceptibility of the enamel to erosion.