Comparison of Surface Hardness of Four Group Resin Composites after Application of Different Mouthrinses

Plaque control by mechanical method is not sufficient and mouthrinses are highly recomended for patients. Some studies have shown that both of alcohol and alcohol free mouthrinses can reduce the microhardness of restorative materials. This study aimed to investigate the effect of three commercial mouthrinses on the microhardness of four different composite resin. 60 specimens from P60، Z350، Z250، Z100 composite resin، with the same size were prepared. Each group was divided to four subgroups، each 15. Vickers test with 100g force and 15 seconds was loaded on the samples before and after of immersing in Listerine، Oral-B، EpiMax and distilled water for 24 hours. Surface hardness of P60 resin composite significantly decreased in all of the mouthrinses and distilled water. Surface hardness of Z350 resin composite significantly reduced in all groups except EpiMax mouthrinse. Surface hardness of Z250 resin composite in distilled water and Listerine mouthrinse was not significant، but it was significant in Oral-B and EpiMax. Reducing of surface hardness of Z100 resin composite was significant in all of the mouthrinses، but in distilled water it was not significant. Alcohol did not affect decreasing of microhardness of resin composites.