Shear Bond Strength of Light Cured Resin Composite to Bleached Enamel Pre-Treated with Probiotic

Aim: To assess the Shear Bond Strength (ShBS) of light cured composite resin to bleached enamel pre-treated with probiotic. Materials and Method: 40 extracted permanent maxillary central incisors teeth were obtained, decoronated, mounted on resin blocks and grouped into four namely Group 1: Resin Composite restoration done without bleaching (positive control), Group 2: Vital bleaching is done with 40% hydrogen peroxide for 20 minutes followed by composite restoration (negative control), Group 3: Composite restoration delayed by 4 weeks after vital bleaching, Group 4: Composite restoration on bleached enamel pretreated with probiotic for 60 minutes. All the specimens were conserved for one day (24 hours) in deionized water and subjected to analysis for ShBS using cross head speed of 0.5 mm per minute. Statistical Analysis: Data was tabulated on excel sheet and analyzed statistically using SPSS software. Results: One way ANOVA statistical test showed a statistically significant difference in the mean ShBS values between the groups. Group 1 (positive control), Group 3 (delayed bonding), and Group 4 (probiotic) had considerably higher values of mean ShBS than Group 2 (immediate bonding). Conclusion: Probiotic pre-treatment on bleached enamel was able to effectively reverse the effect on ShBS of enamel treated with bleaching agent.