Influence of mouth rinses on the surface hardness of dental resin nano-composite

Objective: the aim of this research was to assess the effect of mouth rinses with and without alcohol on the hardness of dental nano-filled composite. methods: the micro-hardness of fifty circular disk shaped specimens of 7 mm × 2 mm were measured after 14 days. specimens were immersed into alcohol containing (listerine and colgate perioguard) and alcohol-free (prodent and sensodyne oral antiseptic) mouth rinse solutions. artificial saliva served as the control. vickers micro-hardness was measured with a 30gram load for 30 seconds dwell time by using a diamond indenter. significant differences were represented by p<0.05,whereas highly significant difference represented by p<0.01. the level of significance (p) was calculated with the help of repeated measure anova. for multiple comparisons,tukey’s multiple comparison test was used. results: statistical analysis revealed highly significant difference between specimens immersed in artificial saliva (control) and listerine (p<0.01). whereas significant difference were observed between control and colgate periogard (p<0.05). however,no significant difference was observed on comparing prodent and sensodyne oral antiseptic mouth rinses with control group(p>0.05). control specimens depicted highest value of micro-hardness(60.5746 ± 3.2703) compared to the lowest value seen in specimens immersed in listerine solvent(54.4687 ± 1.0937). conclusion: alcohol containing mouth rinsing solutions have more deleterious effect on hardness of nano composites as compared to alcohol-free mouth rinses. © 2015,professional medical publications. all rights reserved.