AN IN VITRO COMPARATIVE STUDY EVALUATING THE EFFECT OF TWO NON-ENZYMATIC ANTIOXIDANTS ON SHEAR BOND STRENGTH OF RESIN BASED COMPOSITE RESTORED TO OFFICE BLEACHED ENAMEL

Dr. Abhisek Guria* and Dr. Bharath M. J.

ABSTRACT

Aim: To evaluate and compare the effect of 5% grape seed extract solution and 5% green tea extract solution on shear bond strength of resin based composite restored on office bleached enamel. Materials and methods: Labial enamel surfaces of 60 freshly extracted human maxillary central incisors were flattened using 600 grit silicon carbide paper. Then specimens were randomly divided into four groups of fifteen samples in each group. (n=15). Group 1: no bleaching (control); Group 2: Bleaching with 35% hydrogen peroxide gel; Group 3: Bleaching, followed by application of 5% grape seed extract (proanthocyanidin); Group 4: Bleaching, followed by application of 5% green tea extract (epigallocatechin gallate). Labial surfaces of all specimens were etched with 37% phosphoric acid and rinsed with water. Then bonding agent was applied and composite buildup was done. Then all samples were subjected to shear bond testing in universal testing machine. Statistical analysis: One-way ANOVA was used for multiple group comparison and post hoc Tukey’s test for individual group wise comparison. Results: Highest shear bond strength values were observed in control group (25.55 + 3.49). Among the antioxidants, Group 4 (19.72 + 2.28) showed significantly higher shear bond strength values than Group 3 (18.77 + 2.05). although there was no statistically significant difference between Group 3 and 4(P = 0.741). Lowest shear bond strength was found in Group 2 (12.14 + 2.23).

Keywords: Vital tooth bleaching, Shear bond strength, Antioxidants, Grape seed extract, Green tea extract.