Change the Property of the Bulk Fill Resins in Acid

Objectives: To evaluate roughness, microhardness, translucency, color and weight of bulk fill resins.
Methods: 50 test samples (n=10) with dimensions 10x2mm were prepared and evaluated before and after immersion in 10ml of Coke to test roughness, microhardness, translucency, and alteration in color and weight. The statistical analysis was performed using ANOVA, with Tukey's post-test, considering material and immersion time. Pearson's test was used to verify correlation between the variables. All tests were performed using SPSS, version 22.0 (SPSS Inc) with an error margin of 5%.
Results: Anova test identified statistical differences between the groups regarding time of evaluation and Tukey's test confirmed a statistically significant difference in microhardness of resins Z350 XT and Xtra fill. There was statistically significant difference in roughness between resins SDR flow and Z350XT in the periods evaluated (baseline and 48h). Regarding weight, resins Z350 XT and Tetric EVC showed a significant weight gain after 48h of immersion and the X-tra fill lost weight in the same period. SDR presented the most visible chromatic alterations in the periods evaluated. Regarding translucency, the filtek bulk fill showed higher values.
Conclusions: Coke can affect roughness, microhardness, translucency and the color of the evaluated composites. More studies are needed to examine the effects of Coke "in vivo".