Effect of Polishing on Color Staining of a Composite Resin.

Objectives: The aim of this study was to evaluate the effect of different polishing systems on color stability of a new stain resistant novel filler technology composite resin material immersed in three solutions (distilled water, Coffee, Red wine).

Methods: Thirty disc-shaped composite resin specimens (TPH-SpectraST ShadeA1, DENSPLY) of 5mm diameter and 1mm thickness were prepared for each of six study groups. After 24hours storage at 37^oC and 100% relative humidity, the surface of each specimen was polished using one of six different finishing/polishing systems. Group1: Composite finishing burs, Group2: Finishing bur + Enhance system, Group3: Finishing bur + Enhance system + PoGo with prisma gloss, Group4: Finishing bur + Sof-Lex polishing discs, Group5: Finishing bur ₊ ShofuDental polishing kit, Group6: Finishing bur ₊ UltradentJiffypolishing kit. Each polished group was then randomly divided into 3 subgroups (N=10) and stored in one of the three immersion solutions. The color changes of samples before and after immersion in test solutions for 1, 5 and 10 days were evaluated with a spectrophotometer (CM700d, Konica Minolta). The color change values (ΔE) were statistically analyzed using three-way ANOVA and Pairwise Comparisons by Holm Sidak Method.

Results: For all study groups, there was no significant difference in staining between 5 and 10 days results for any storage solution (p>0.05). No significant change was observed in distilled water samples after 10 days (p>0.05). Color change was highest in group 1 for both coffee and wine. After 10 days, both polishing groups 4 and 5 showed significantly lowest color change (ΔE) in all study solutions. Wine caused more staining of the composite samples compared to coffee.

Conclusions: The Sof-Lex polishing discs and Shofu Dental polishing kits are recommended for less color staining of composite resin materials with red wine and coffee consumption.