Tensile bond strength of brackets after antioxidant treatment on bleached teeth

H. Bulut, A. D. Kaya, M. Turkun
2005 European Journal of Orthodontics  
Various studies have reported a signifi cant reduction in tensile bond strength of brackets when bonding is carried out immediately after bleaching. The purpose of this investigation was to determine the effect of an antioxidant agent on the tensile bond strength values of metal brackets bonded with composite resin to human enamel after bleaching with carbamide peroxide (CP). A total of 80 extracted premolar teeth were randomly divided into three bleaching groups of 10 per cent CP and an
more » ... hed control group. The specimens in group 1 were bonded immediately after bleaching; group 2 were stored in an artifi cial saliva solution for 7 days after bleaching; group 3 were treated with 10 per cent sodium ascorbate, immediately before bonding, whereas the unbleached specimens in group 4 had no treatment before bonding. Tensile bond strengths were established in MPa. To evaluate the amount of resin left on the enamel surfaces after debonding, the adhesive remnant index (ARI) scores were used. The tensile bond strength data were analyzed with the Kruskal-Wallis test and pairwise comparisons were made by the Mann-Whitney U test at a signifi cance level of P < 0.05. The brackets bonded immediately after bleaching revealed signifi cantly lower tensile bond strengths than those of unbleached enamel (P = 0.000). No statistically signifi cant differences in tensile bond strength were noted when the delayed-bonding (P = 6.000) and antioxidant-treated (P = 0.2757) groups were compared with the control group. The antioxidant treatment immediately after bleaching was effective in reversing the tensile bond strength of brackets.
doi:10.1093/ejo/cji044 pmid:16043470 fatcat:jkcfpwzc7vecjgfvuaolxm7psq