Effect of different placement techniques on color stability and surface roughness of resin composites

Abstract

Introduction: Longevity and clinical success of dental restorations can be influenced by many factors during the restorative procedures. Objective: This study aimed to evaluate the influence of different placement techniques on color stability and surface roughness of two resin composites. Material and method: The groups of specimens (n=10) were divided according to resin composite (Filtek™ Z250 XT and Filtek™ Z350 XT) and placement technique: Mylar strip, spatula, dry brush, modeling liquid, and surface sealant. Color stability and surface roughness were accessed using a spectrophotometer (CIELab color space) and a rugosimeter (standard cutoff of 0.8 mm), respectively, after water storage. Subsequently, the specimens were immersed in coffee for 48 h and final color was measured. The data were analyzed using ANOVA and the Tukey’s post hoc test (α=5%) and the correlation between surface roughness (Ra) and color change (∆Eab) was assessed using the Pearson’s correlation coefficient. Result: The different placement techniques influenced Ra and ∆Eab on both resin composites. The groups treated with surface sealant showed greater difference in ∆Eab for both resin composites. The Filtek™ Z250 XT resin showed greater color stability compared with the Filtek™ Z350 XT resin regardless of the placement technique used. Ra of each placement technique was similar among the resin composites except for the Filtek™ Z350 XT modeling liquid group, which presented lower Ra values compared with those of Filtek™ Z250 XT. A correlation between Ra and staining was identified (p=0.268). Conclusion: Color stability and Ra are influenced by different placement techniques.