Purpose: The aim of this study is to evaluate the effect of different polishing systems on the color stability of single-shade composite resin after coffee immersion, brushing cycles, and re-polishing.
Materials & Methods: A total of 40 disc-shaped single-shade composite resin (Omnichroma, Tokuyama, Japan) specimens were prepared using a standard mold. One-step (OneGloss, Shofu, USA), two-step (Clearfil Twist Dia, Kuraray, Japan), multi-step (OptiDisc, Kerr, USA) polishing systems were applied to each group (n=10) in accordance with the manufacturer's instructions. No polishing procedure was applied to the Control group. Representing 6 months and 1 year of clinical use, specimens were immersed in coffee solution (6–12 days) and subjected to brushing cycles (5000–10000 cycles). The specimens were then re-polished by applying the same polishing procedures as initially applied. Color measurements were repeated in all periods, and color change values were calculated with the CIEDE2000 formulation. Kruskal-Wallis analysis was used for between group comparison, and the Mann-Whitney U test was used as a post-hoc test. Statistical significance was accepted as p<0.05.
Results: At 6 months and 1 year periods, the ΔE values of the control group and OneGloss group were statistically similar and significantly higher than the other groups (p<0.05). There was no statistically significant difference between all groups in ΔE values after re-polishing.
Conclusion: Two-step and multi-step polishing systems exhibited superior properties in the color change of single-shade composite resin. Although re-polishing reduced the ΔE values, no polishing system was able to reduce the color change of single-shade composite resin below the acceptable threshold.
Primary Language | English |
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Subjects | Dental Materials and Equipment, Restorative Dentistry |
Journal Section | Original Research Articles |
Authors | |
Early Pub Date | December 24, 2024 |
Publication Date | |
Submission Date | April 30, 2024 |
Acceptance Date | October 22, 2024 |
Published in Issue | Year 2024 Volume: 51 Issue: 3 |