COMPARATIVE EVALUATION OF MORINGA OLEIFERA ETHANOLIC EXTRACT AND SODIUM ASCORBATE SOLUTION AS ANTIOXIDANTS ON SHEAR BOND STRENGTH OF COMPOSITE TO BLEACHED ENAMEL

Dr. Krishnaprasad L MDS,DNB,MBA and Dr. Julia Jacob Ukken*

ABSTRACT

Background: Due to the increased demand for aesthetics, bleaching is occasionally followed by composite restoration. The bond strength of composite resin to enamel has been observed to be reduced by the interaction of bleaching chemicals with tooth substrate. This is because the bleaching process releases free radicals that interfere with polymerization. The use of antioxidants can be highlighted since it seems to be a more effective alternative to reduce or remove the residual oxygen and immediate improvement in shear bond strength. Objective: The purpose of this study is to evaluate the effect of 10% sodium ascorbate, 80 % ethanolic extract of moringa oleifera extract on the shear bond strength of composite resin to bleached enamel. Materials and methods: Thirty extracted single-rooted anterior teeth were decoronated and crowns were embedded in acrylic resin block with labial surface exposed. They were randomly divided into three groups, (i) Group 1: control (bleaching only), (ii) Group 2: bleaching +80 % ethanolic extract of moringa oleifera (iii) Group 3: bleaching +10 % sodium ascorbate solution. Labial surfaces were then bleached with 37.5% hydrogen peroxide following manufacturer’s instructions. After that, the experimental groups were treated with respective antioxidant solutions following which composite build up of 3 mm × 3 mm were done. Shear bond strength of the specimens was tested under universal testing machine. Results: For Group II and Group III showed statistically significant increase in the shear bond strength (P- Value >0.05). However, group III (Sodium ascorbate) showed more increase in the shear bond strength than group II(moringa extract) and the least in the control group. Conclusion: Application of 10% ascorbic acid to the bleached dentin improved the shear bond strength of resin composite.

Keywords: Composite Resin, Shear bond strength, Sodium ascorbate, Moringa extract.