Effect of Home Bleaching on Surface Roughness of Novel Composite Resins Subjected to One Step Polishing System: An In Vitro Study

Abstract

The aims of this in vitro study was to evaluate surface roughness (Ra) of four contemporary composite resin materials after applying home bleaching agent.

Materials and Methods: Forty-eight composite specimens were made from four groups of different types composite resins (one-submicron hybrid, one microhybrid and two nanohybrid) of 12 specimens each: Group 1: Brilliant EverGlow, group 2: G-ænial from GC, group 3: Evetric and group 4: Ice, SDI. All the samples were polished with one step polishing system OptraPol. Each group was further subdivided into two subgroups (A&B) (n=6). Subgroups A were stored in distilled water as control, while subgroups B were bleached with 20% carbamide peroxide home bleaching agent for 14 day. Surface roughness analysis was then performed for all the samples using atomic force microscopy (AFM). Results were statistically analyzed using One-way ANOVA/LSD test analyzing the differences between the subgroups at p<0.05.

Results: Surface roughness of all the groups increased after bleaching; however, LSD test showed significant differences that were only recorded between the subgroups of groups 3 & 4.

Conclusion: 20% at-home bleaching treatment significantly affected surface roughness of both nanohybrid composite groups, while, it did not produce a significant surface changes for microhybrid and submicron composite resin.