Clinical Performance of Template-assisted Monochromatic Structural Colored Versus Universal Multishade Direct Composite Veneers Over 3 Years: A Randomized Clinical Trial

Background: We conducted a clinical trial using a modified split-mouth, double-blind, randomized approach to clinically assess template-assisted monochromatic structural colored versus universal multishade direct composite veneers over a 36-month period.Materials and Methods: A total of 88 direct composite veneers from 20 participants were included per the inclusion criteria. Each patient received at least one pair of the two types of direct veneers in two equal groups (n = 44): (group I): monochromatic structural colored veneer (OMNICHROMA) with palfique adhesive and (group II): universal multishade veneer (Ceram.x spectra) with Prime & Bond adhesive using U-veneer templates. Window-type veneer preparations were performed on the labial surface of anterior teeth (depth: 0.3-0.5 mm). Clinical assessment was conducted per modified United States Public Health Service (USPHS) criteria. The marginal integrity criterion was evaluated by scanning electron microscopy of an inverse replica of 32 randomly selected veneer restorations. Results: = 0.218 and 0.236, respectively). Spearman's correlation test, conducted on the related criteria in groups I and II after 12, 18, and 36 months of follow-up, revealed a positive relationship between the evaluated criteria. Conclusions: Composite, Monochromatic, Multishade, Veneers, USPHS criteria.