Color match of single-shade restorations after professional dental bleaching: An in vitro study

Abstract Background: Restorative dentistry aims to reproduce natural tooth shades through resin composites that must be layered to obtain colors, opacities, and translucencies, and therefore, clinical success is operator skill dependent. Aims: The purpose of this study is to evaluate the color shift of single-shade composite restorations before and after dental bleaching. Materials and Methods: Eighty human extracted posterior teeth were restored with four single-shade composites (Omnichroma OM; Clearfil Majesty ES-2 Universal CL; Essentia Universal ES; Venus Diamond One VE) ( n = 20 each). Standardized V class cavities were prepared on buccal side. VITA Easyshade V spectrophotometer was used to register VITA color and color coordinates 24 h before (T 0 ), 24 h after (T 1 ), and 1 week after (T 2 ) dental bleaching (Opalescence Boost PF 40%). Color differences (ΔE ab ) and (ΔWI D ) were calculated and subjected to statistical analysis. Statistical Analysis: Categorical variables were analyzed using Pearson Chi-square, and data from color coordinates were analyzed using one-way analysis of variance and Tukey’s multiple comparison test with Bonferroni correction. Paired t -tests were performed to compare continuous measures between groups and treatment time. Results: Instrumental evaluations revealed statistically significant differences between materials ( P < 0.05) with lower values for ES and VE samples followed by CL and OM at T 0 and T 1 . At T 2 , OM and CL ΔE ab values decrease getting closer to ES and VE. Conclusion: Single-shade composites seem to match with the surrounding bleached tooth.