Effect of 10% carbamide peroxide bleaching gel on marginal Integrity of tooth colored restorative materials : An invitro microleakage study

Aims and objectives: To evaluate the effect of 10% carbamide peroxide bleaching gel on marginal integrity of tooth colored restorative materials. Materials and Methods: Forty five human premolar teeth extracted for orthodontic reason with good enamel integrity were selected for the study and divided into three groups of 15 teeth each. Class-V cavities were prepared on the buccal surfaces of the teeth. The cavities were restored with composite resin, resin modified glassionomer, and conventional glass ionomer in the respective groups. 10 teeth in each group were subjected to thermocycling. After thermocycling the teeth were exposed to the bleaching agent. The remaining teeth were kept aside as control. After bleaching, all the teeth, including the control groups were subjected to microleakage analysis. Results:  Statistical significant differences(P<0.001) were seen between the control groups and the experimental groups. The marginal integrity of the resin modified glass ionomer was less affected while exposing to  bleaching, when compared to composite resin and conventional glass ionomer. Conclusion:  The results suggest that resin modified glass ionomer performed better at both enamel and dentin margins when compared to the other two experimental groups. &nbsp