Clinical performance of single shade universal resin composites: a randomized controlled one year follow-up study.

OBJECTIVE: This randomized controlled clinical study aimed to evaluate the one year clinical performance of single shade universal resin composites in Class II restorations according to the World Dental Federation (FDI) criteria. MATERIALS AND METHODS: A total of 180 Class II restorations were placed in 62 patients using four different single-shade universal composites (Charisma Diamond One, Vittra APS Unique, Omnichroma, and Zenchroma) and one conventional composite (Clearfil Majesty Posterior), randomly assigned via random.org. Enamel margins were selectively etched with phosphoric acid, followed by application of Scotchbond Universal Plus adhesive. Clinical evaluations were performed at baseline (1 week), 6 months, and 12 months by two independent examiners according to the FDI criteria (scores 1-5). Data were analyzed using the Shapiro-Wilk test (p < 0.05), Friedman test, and Kruskal-Wallis test (α = 0.05). RESULTS: All materials demonstrated clinically acceptable performance over 12 months in terms of fracture/retention, marginal adaptation, proximal contact, occlusion, wear, secondary caries, tooth integrity, postoperative sensitivity, and surface texture (p > 0.05). Only Charisma Diamond One maintained color stability without significant changes (p > 0.05), whereas the other materials exhibited statistically significant deterioration in color matching and marginal staining (p < 0.05). Intergroup differences were observed only in the color match parameter at 6 and 12 months (p = 0.001). CONCLUSION: Within the limitations of this study, single-shade universal composites demonstrated satisfactory one-year clinical performance and may be considered effective alternatives to conventional composites in Class II restorations. CLINICAL RELEVANCE: Single-shade composites provide a simplified yet clinically reliable approach for posterior restorations. TRIAL REGISTRATION: US National Library of Medicine, www. CLINICALTRIALS: gov , ID: NCT06563128. Registered on 2024/08/20. Clinical Success of Single Color Universal Resin Composites.