Effect of Streptococcus mutans on the flexural strength of resin-based restorative materials

Background: There are a limited number of studies about the effects microbial aging on mechanical properties restorative materials. Therefore, this study aimed to evaluate effect simulated with Streptococcus mutans flexural strength different resin-based Materials and Methods: This experimental was performed blocks types materials including composite resin, giomer, resin-modified glass ionomer (RMGI). Moreover, three aging, such as 30-day storage in distilled water, S. mutans, germ-free culture medium, were used study. The three-point bending specimens before after measured according International Organization for Standardization-4049 standard. Data analyzed by two-way ANOVA post hoc Tukey's tests. A P Results: Results showed that significantly reduced all (P = 0.00). In materials, bacteria-free medium acted same there no significant difference between these two solutions terms material, compared before-aging > 0.05). Furthermore, observed mutans-based water regarding RMGI 0.75). Conclusion: It can be concluded