Polishing techniques and glaze application may affect the color change of composite resins. The object of this study was to evaluate the effect of different polishing techniques and glaze application on the color stability of two different types of composites.
Method:
Twenty-four discs (5 X 2 mm) were fabricated for two different types of composites (microhybrid and nanohybrid) composite resins (Filtek Z250 and Filtek Z 550, 3M ESPE), prepared using polyester strips and divided into 4 groups of 6 according to the polishing procedures. The specimens’ were polished with OptiDisc polishing discs (Kerr) with preceding the Biscover LV (Bisco) application with Sparkle Diamond Polishing Paste (Pulpdent) and ENA Shiny (Micerium). The measurements were done using reflectance spectrophotometer (Vita Easyshade Compact, Vident) based on the CIE L*a*b* color scale after polishing (baseline) and after storage for 1 day in staining solution (filtered coffee, Kahve Dunyasi). All comparisons of color change for polishing procedures and restorative materials were subjected to two way Anova and the significant color changes (delta E*) occurred during immersion after different polishing procedures and glaze application were tested with Bonferroni Correction.
Result:
Both resin composites showed color change after 1 day storage. Filtek Z 250 showed more color change than Filtek Z550. There was no statistically dignificant differences among polishing groups for Filtek Z 550. However the specimens polished with ENA Shiny showed more color change than the specimens polished with OptiDisc polishing discs and the specimens polished with OptiDisc with preceding the Biscover LV.
Conclusion:
Within the limitations of this study it could be concluded that nanohybrid composite Filtek Z550 was more color stable than microhybrid composite Filtek Z 250