Surface Roughness of Nanohybrid Composites with Different Monomers after Finishing and Polishing with Different Polishing Systems

Abstract

Background: The most frequently used monomer in commercial composite resins is bisphenol A glycidyl dimethacrylate. Bisphenol A glycidyl dimethacrylate free monomer and the long chain dimer acid based monomer were considered as an alternative method to improve mechanical and physical properties of composite resins. Objective: To study the surface roughness of different nanohybrid composites with different monomer compositions after finishing and polishing with different polishing systems. Materials and Methods: 72 composite disk specimens were prepared and divided into 3 groups (n=24) according to the resin composite that were used (harmonizekerr,venusdiamondheraeuskulzerandn'duranceseptodont). Each group was subdivided into 4 subgroups (n=6) according to the polishing technique that was used (Jiffy natural universalwheelsultradent,sof-lexspiral wheels 3mespe,hilusterkerrorenhance systemdentsply). Atomic force microscope was used to measure surface roughness. Results: There was statistical significant difference in surface roughness measuring among differentn'durance,venusdiamondandharmonizegroups (Kruskal Wallis Test p<0.05). Post hock pairwise comparison revealed thatvenusdiamondshowed statistically significant higher surface roughness when compared with eithern'duranceandharmonize. Among the polishing systems,jiffynaturaluniversalwheelsproduce the least surface roughness. Conclusion: Different monomer compositions may have direct effect on the final surface polish of the restorative materials. Clinical significance: The use ofjiffy natural universalwheelsmay be found to result in the smoothest surface finish with the least clinical steps.