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

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 (T0 ), 24 h after (T1 ), and 1 week after (T2 ) dental bleaching (Opalescence Boost PF 40%). Color differences (ΔEab ) and (ΔWID ) 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 T0 and T1 . At T2 , OM and CL ΔEab values decrease getting closer to ES and VE.

CONCLUSION: Single-shade composites seem to match with the surrounding bleached tooth.