Effect of effervescent C vitamins on the surface roughness and color stability of composite resins: A SEM study.

Objective To investigate the effect of effervescent vitamins C on the color change and surface roughness of resin composites. Methods 30 specimens (8 mm*2 mm) were prepared for each restorative material (G-ænial Posterior, Solidex). The specimens were polymerized with LED device for 20 seconds and were incubated in distilled water for 24 hours for post-polymerization. Initial color values were measured using a spectrophotometer (Vita Easyshade V, Vita Zahnfabrik, Bad Säckingen, Germany), and initial surface roughness was measured with roughness tester (Mitutoyo SJ-410 Surftest Analyzer). The specimens were randomly divided into 3 groups according to their immersion solution (Redoxon, Ocean efervit, and distilled water). During the 28-day test period, the specimens were immersed in the solutions 2 times a day. Color changes and surface roughness measurement procedures were repeated. Data were subjected to One-way ANOVA, Tukey test, and t-test (p=0.05). Results When the color change (?E00) results are examined statistically; the highest ?E values were observed in the Redoxon group, regardless of the restorative material. G-ænial Posterior specimens from both study groups and Solidex specimens incubated in Redoxon showed clinically unacceptable discoloration. When the average roughness values (Ra) are analyzed statistically, roughness values above the threshold surface roughness (Ra=0.2 µm) was detected in all groups. However, no statistically significant difference between groups (p>0.05). Conclusion Despite the fact that effervescent C vitamins significantly increased the discoloration of the tested composite resins, not cause a statistically significant difference in surface roughness.