EFFECT OF BRUSHING AND WHITENING-TOOTHPASTE ON SURFACE PROPERTIES OF COMPOSITES

Purpose: purpose of this in vitro study is to compare the effect of brushing and two different whitening toothpaste brushing on surface roughness and microhardness of four different type of composites (hybrid, nanohybrid, nanofilled and silorane based composites). material and methods: 80 composite samples were prepared. samples were classified into 4 main groups (n=20): control,colgate motion whitening toothbrush (cwt),opalescence whitening toothpaste (owt) and beyond pearl white toothpaste (bpw). control group was stored in distilled water for 14 day, as baseline. cwt brushing were applied 2 minutes a day with distilled water or owt or bpw for 14 days. after 14 days, surface roughness (sa) was measured by noncontact 3d laser profilometer and surface hardness (vhn) were measured by vickers tester. sem evaluation was done under x750. kruskal wallis, post hoc dunn’s multiple comparison, mann whitney u tests were used in the comparison of groups. statistical significance level was established at p<0.05. result: although roughness’s of the hybrid and nano filled composites were significantly increased (p<0.05), there are no significant changes were measured in surface hardness of cwt brushed composite specimens (p≥0.05). hybrid composite showed the most roughness surface after brushing with bpw (32.62±6.17). no structural changes were detected on sem micrographs of all groups after brushing. conclusion: there is no significant differences between micro hardness of microhybrid composites which are neither methacrylate nor silorane based composites. roughness and hardness of nano composites showed no significant difference after brushing with toothbrush and whitening toothpastes.