Abstract Single-shade resin composites have been introduced to simplify restorative procedures by eliminating shade selection; however, their baseline color-matching performance in esthetically demanding anterior regions remains uncertain. This randomized clinical trial aimed to evaluate and compare whether two commercially available single-shade resin composites (Omnichroma and Charisma Topaz One), applied using a standardized adhesive and restorative protocol, achieved clinically acceptable baseline (24 h) color-matching in anterior non-carious cervical lesions (NCCLs), based on spectrophotometrically determined ΔE₀₀ values. A total of 62 restorations were placed in 31 patients and randomly allocated to two groups. Color measurements were obtained from the middle third of the tooth at baseline and from the corresponding restoration area at 24 h, and ΔE₀₀ values were calculated using the CIEDE2000 formula. Statistical analysis was performed using SPSS v26. A linear mixed effects model was used to assess the influence of material type, age, and gender on color outcomes. Both materials exhibited mean ΔE₀₀ values exceeding the predefined clinical acceptability threshold of 1.8 (Omnichroma: 5.10 ± 2.89; Charisma Topaz One: 6.96 ± 5.85), indicating poor baseline color-matching in anterior NCCLs. No statistically significant difference was observed between the two materials ( p = 0.371). Within the limitations of this study, neither tested single-shade resin composite provided clinically acceptable 24 h color-matching in anterior NCCLs. These findings are limited to the two materials evaluated under the present clinical protocol and do not allow extrapolation to conventional multi-shade composites or long-term color stability. Further randomized clinical studies with larger sample sizes, incorporation of multi-shade control groups, and extended follow-up periods are warranted to confirm these results. Trial registration : ClinicalTrials.gov Identifier: NCT06473727, registered June 26, 2024.
Doğan et al. (Sat,) studied this question.