Objective: The effect of 10% sodium ascorbate, 10% pine bark extract, and 10%Aloe vera on the shear bond strength of composite resin to bleached enamel was evaluated.
Materials and Methods: Fifty recently extracted human single rooted teeth were divided into six groups of 10 teeth each. In Group I (positive control), the composite bonding was done immediately after bleaching. Except Group V (negative control), the labial enamel surface of all specimens in the other groups were bleached with 35% hydrogen peroxide followed by composite restoration. Groups II, III, and IV specimens were treated with antioxidants 10% sodium ascorbate, 10% pine bark extract, 10%Aloe vera respectively, for 10 min and bonded with composite resin. All specimens were stored in deionized water for 24 h at 37°C before shear bond strength testing by using universal testing machine.The data obtained were tabulated and statistically analyzed using analysis of variance One way ANOVA test and post hoc Tukey test.
Results: The unbleached teeth showed the highest shear bond strength followed by the bleached teeth treated with the antioxidant 10% Aloe vera.
Conclusion: Within the limitations of this study, it was observed that the use of antioxidants effectively reversed the compromised bond strength of bleached enamel. Among the antioxidants, 10% Aloe vera application after bleaching showed better bond strength.
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