Clinical Implications of Color Adjustment in Single-Shade Resins Post-Dental Bleaching: A Systematic Review

Background: Tooth bleaching can compromise the color match between dental tissues and restorations. Single-shade resin-based composites (RBCs) have been developed to simplify shade matching; however, their performance after dental bleaching remains uncertain. Objectives: This study aimed to evaluate the ability of single-shade RBCs to adapt to the color of the dental substrate after dental bleaching. Methods: A systematic review was conducted according to the PRISMA guidelines and registered in PROSPERO. Searches were performed in PubMed, Embase, Web of Science, and Scopus (December 2024). In vitro studies were selected based on the PICOS criteria (P: human or bovine teeth; I: teeth restored with single-shade RBCs and bleached; C: bleached dental tissue; O: color match; S: in vitro studies). Two reviewers (kappa = 0.90) applied eligibility criteria, extracted the data, and assessed the risk of bias using the RoBDEMAT tool. Results: Eight studies involving 362 restorations were included. Most studies indicated that single-shade RBCs achieved an acceptable color match after tooth bleaching. Study quality was generally moderate to low, with most evaluations rated as "sufficiently reported or adequate". Conclusions: Single-shade RBCs demonstrated the ability to match bleached dental tissue in vitro, although effectiveness may vary depending on bleaching duration and storage conditions.