Color Agreement of Try-In Paste and Resin Cement on Zirconia Laminate Veneers

Aim: This study investigates the reliability of try-in pastes in determining the final color of zirconia laminate veneer restorations produced with varying thicknesses. Material and Methods: Phantom teeth were prepared in three thicknesses (0.5, 0.7, 1 mm) using depth gauge burs. The preparations were scanned with an intraoral scanner, and impressions were taken. Thirty resin die models were produced using a 3D printer. Zirconia laminate veneers were fabricated in three specified thicknesses. Initial color measurements (L, a, b values) of the veneers, applied to the die models with transparent petroleum jelly were taken. Color measurements were repeated using try-in paste after removing the petroleum jelly. The veneers were then roughened, ultrasonically cleaned, and ceramic primer applied. They were cemented with resin cement matched to the try-in paste color. Final color data were obtained using a spectrophotometer. Color change values were calculated from the L, a, b values, and data were compared using two-way ANOVA and Bonferroni Test. Results: The thickness of the material did not influence color change, whereas the use of try-in paste or resin cement resulted in significant color differences. Conclusion: The study findings indicate that try-in pastes are not reliable indicators of the final restoration color. It is crucial to consider that resin cement can substantially alter the color of zirconia laminate veneers when determining the final shade.