“Effectiveness of Antoxidant Treatments in Restoring Composite Bond Strength after Tooth Bleaching: An In Vitro Comparative Study ”
DOI:
https://doi.org/10.63682/jns.v14i32S.9303Keywords:
Tooth bleaching, Proanthocyanidin, Shear bond strength, AntioxidantsAbstract
Background: Tooth-whitening using hydrogen peroxide weakens the strength of resin-enamel bonds because of the residual free radical oxygen that prevents polymerisation of the acid bond. Use of antioxidants could help address the effects to a large extent through the elimination of the radical species, resulting in the recovery of bonding.
Objective: To compare the effectiveness of Proanthocyanidin (PA) a in restoring composite bond strength to bleached enamel.
Methods: This in-vitro study considered 84 upper incisors divided into four groups that included a control, a bleached control, bleached-potassium aluminium phosphate (PA) mix, and. Antioxidants were done after bleaching with 35 per cent hydrogen peroxide. Shear bond strength (SBS) was evaluated by a universal testing machine and the failure modes were analysed by scanning electron microscopy (SEM).
Results: Antioxidants improved SBS significantly (p<0.05), with PA restoring values close to unbleached enamel. SEM revealed more cohesive failures in PA-treated specimens, indicating stronger adhesion.
Conclusion: Application of an antioxidant immediately after tooth bleaching prevents the reduction in bond strength that is commonly encountered. In this context, the proanthocyanidin has displayed greater efficacy
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