Investigation of Various Finishing/Polishing Procedures on Color Stability of Composite Resins

Abstract

Objective: The objective of this study was to assess the impact of various finishing and polishing systems on the color stability of composite resins treated with coffee. Methods: Fifty samples of each of nanohybrid and supra-nanohybrid composite resin materials were prepared and each material was randomly divided into 5 groups (n=10): Group 1: Control group (mylar strip), Group 2: One Gloss (one step), Group 3: One Gloss + polishing paste, Group 4: Soflex disk (multistep), Group 5: Soflex disk + polishing paste. The samples were colored in coffee solution for 144 hours to simulate six months of coffee consumption after polishing. The color of the samples before-after staining was measured with a spectrophotometer and ∆E00 values were calculated. Results: Material, polishing type and the interaction of these two parameters had a statistical effect on the color change values (p< 0,001). The ∆E00 values of supra-nanohybrid composite resin were higher than nanohybrid. Both materials exhibited color change above the thresholds of clinical perceptibility (PT> 0,8) and acceptability (AT> 1,8). In terms of polishing types, the highest ∆E00 was found in the control group and the lowest in the disk group. The additionally applied polishing paste caused a non-significant decrease in the color change of the single-step polishing system (p< 0,05) and a statistically significant increase in the multi-steps polishing system (p> 0,05). Conclusion: Considering the limitations of the study, it can be concluded that the use of multi-steps discs is more advantageous in preventing discoloration of composite resins.