Effect of Polymerization Time and Home Bleaching Agent on the Microhardness and Surface Roughness of Bulk-Fill Composites: A Scanning Electron Microscopy Study

الملخص EN

Objective.

The aim of this study is to evaluate the microhardness and surface roughness of two different bulk-fill composites polymerized with light-curing unit (LCU) with different polymerization times before and after the application of a home bleaching agent.

Materials-Methods.

For both microhardness and surface roughness tests, 6 groups were prepared with bulk-fill materials (SonicFill, Filtek Bulk Fill) according to different polymerization times (10, 20, and 30 s).

102 specimens were prepared using Teflon molds (4 mm depth and 5 mm diameter) and polymerized with LCU.

30 specimens (n=5) were assessed for microhardness.

Before home bleaching agent application, the bottom/top (B/T) microhardness ratio was evaluated.

After bleaching agent application, the microhardness measurements were performed on top surfaces.

Roughness measurements were performed in 72 specimens (n=12) before and after bleaching application.

Additionally, for SEM analyses, two specimens from all tested groups were prepared before and after bleaching agent application.

The data B/T microhardness ratio before bleaching was analyzed by two-way ANOVA and Tukey’s HSD test.

The data from the top surface of specimens’ microhardness before and after bleaching were analyzed using Wilcoxon signed-rank test, Kruskal-Wallis, Mann-Whitney U tests.

The data from surface roughness tests were statistically analyzed by multivariate analysis of variance and Bonferroni test (p<0.05).

Results.

The B/T microhardness ratio results revealed no significant differences between groups (p>0.05).

Comparing the microhardness values of the composites’ top surfaces before and after bleaching, a significant decrease was observed exclusively in FB30s (p<0.05).

No significant differences in surface roughness values were observed when the groups were compared based on bulk-fill materials (p>0.05) while the polymerization time affected the surface roughness of the SF20s and SF30s groups (p<0.05).

After bleaching, surface roughness values were significantly increased in the SF20s and SF30s groups (p<0.05).

Conclusion.

The clinicians should adhere to the polymerization time recommended by the manufacturer to ensure the durability of the composite material in the oral environment.