EFFECT OF FOUR COMMERCIAL MOUTHRINSES ON THE MICROHARDNESS OF NANOHYBRID COMPOSITE RESTORATIVE MATERIAL- AN IN VITRO STUDY.

Abstract

Aim: To evaluate the effect of four commercial mouthrinses on the microhardness of nanohybrid composite restorative material. Materials and Method: Forty specimens of nano-hybrid composite material (Tetric-N- Ceram Ivoclar Vivadent) with 3mm diameter and 3mm height were prepared using Teflon moulds. The baseline microhardness of the specimens were recorded using Vickers Microhardness Tester. The specimen were randomly divided into four groups according to mouth rinses used, each containing ten specimens as follows: GROUP A: LISTERINE (Alcohol based) GROUP B: PERIOGARD (Alcohol based) GROUP C: FRESHCLOR (Alcohol Free) GROUP D: HIORA (Alcohol Free). The pH of all mouth rinses were recorded. Then the specimens were immersed in 20 ml of respective mouthrinses and kept in incubator at 37°C for 24 hr. The post immersion microhardness values of the specimens were recorded using Vickers Microhardness Tester and results were subjected to statistical analysis which was done by one-way ANOVA and Post Hoc analysis Result: The decrease of microhardness was seen highest in GROUP A followed by Group B and least in GROUP C and GROUP D. Conclusion: All the mouth rinses showed reduction in surface hardness of the esthetic restorative material. Highest reduction of surface hardness was seen with use of Listerine®mouth rinse followed by Periogard®. There was no statistically significant difference between Freshclor® and Hiora® mouth rinses.