Effect of different antioxidants on shear bond strength of office-bleached enamel to composite
Keywords:
Antioxidants; Ascorbic Acid; Shear Strength; Tooth BleachingAbstract
Objectives: This study aimed to assess the effect of different antioxidants on shear bond strength (SBS) of office-bleached enamel to composite.
Materials and Methods: This in vitro, experimental study evaluated 66 extracted teeth in six groups. The teeth in group 1 were restored with composite only. In group 2, the teeth were restored with composite immediately after office bleaching (OB). In group 3, the teeth were restored with composite 2 weeks after OB. In group 4, sodium ascorbate (SA) was applied on the teeth immediately after OB, and then they were restored with composite. In group 5, ascorbic acid (AA) was applied on the teeth immediately after OB, and they were then restored with composite. In group 6, vitamin C was applied on the teeth immediately after OB, and they were then restored with composite. The SBS of enamel to composite was measured by a universal testing machine and compared by one-way ANOVA and bonferroni post hoc test .
Results: One-way ANOVA showed a significant difference in SBS of the groups (P<0.05). The maximum SBS was noted in group 1 and the minimum SBS was recorded in group 2. Groups 3 and 4 were not significantly different regarding the SBS (P>0.05).
Conclusion: Composite restoration of teeth immediately after bleaching results in lower SBS. Antioxidants can compensate for this reduction. SA is the best option for this purpose. If not available, AA or vitamin C can be used as an alternative to SA for this purpose.