Abstract
ABSTRACTObjective: To evaluate a protocol for bonding metallic brackets after bleaching with hydrogen peroxide (HP). Methods: 60 extracted maxillary premolar were randomly divided into an unbleached control group and two groups bleached with a solution of 35% hydrogen peroxide prior to bonding. The teeth in one of the treated groups were bonded immediately after bleaching; while the other group was treated with 10% sodium ascorbate immediately after bleaching and before bonding. The teeth in all groups were stored in an artificial saliva solution for 7 days after bonding. The shear bond strength data was measured in megapascals (MPa) and the fail attempts were verified. The significance level was established at p< 0.05. Results: The unbleached group, in which brackets were bonded to untreated enamel, had the highest bond strength values (11.0 ± 5.7MPa) in comparison to the bleached group (7.14 ± 40MPa), in which brackets were bonded to recently bleached enamel. Slightly improved bond strength was observed in the antioxidant group (8.13 ± 5.4MPa), in which the teeth were bleached and then the antioxidant was applied to the teeth before bonding. Unbleached and bleached groups showed statistically significant difference for shear bond strength (p=0.03) and load strength (p=0.03); no significant differences were noted between unbleached and antioxidant groups (p=0.52).Conclusion: The antioxidant treatment applied immediately after bleaching was effective in reversing the reduction in shear bond strength of brackets after tooth bleaching.
Highlights
The increasing popularity of tooth whitening/bleaching is having a considerably impact in smile design and dentistry.[1]
Unbleached group (n=20) served as a control group; bleached group consisted of specimens bonded immediately after treated with hydrogen peroxide (n=20), while Antioxidant group specimens (n=20) were treated with a 10% solution of sodium ascorbate agent just before bonding and immediately after bleaching with the same agent used in bleached group
The results for the Student t-test indicated no significant differences between Unbleached group and Antioxidant group, and between Bleached and Antioxidant groups, while comparisons between Unbleached and Bleached groups showed statistically significant difference for shear bond strength values and load strength values
Summary
Bleaching is having a considerably impact in smile design and dentistry.[1] Many whitening systems are used to bleach enamel, some of them have concentrated solutions of hydrogen peroxide (HP), which is the most commonly used agent for whitening discolored teeth These solutions are subjected to either heat or light to accelerate the bleaching reaction.[2]. Hydrogen peroxide can penetrate tooth structure for adequate stain removal This penetration is effective due to the low molecular weight of hydrogen peroxide and its ability to denature proteins. This capability increases the tissue permeability allowing ions to move through the teeth.[3] Hydrogen peroxide releases free oxygen radicals that lead to some cellular changes.[4]
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