Agreement of try-in pastes and the corresponding luting composites on the final color of ceramic veneers.

PURPOSE: The aims of this study were to evaluate the influence of luting composites on the final color of ceramic veneers and to investigate the color matching of try-in pastes to the corresponding luting composites.

MATERIALS AND METHODS: Ceramic discs (shade A3, 1.0 mm thick) were fabricated and seated on composite specimens (shade A3) to mimic a complex of ceramic veneer lying on dentin substrate. The try-in pastes and luting composites of 3M RelyX were applied into the interlayer of the ceramic and composite specimens. The colors of the complexes were measured using a spectrophotometer, and subsequently converted to CIE L*a*b* values. Color changes after luting composites were applied, and the changes between the try-in pastes and the corresponding luting composites were calculated and registered as ΔEluting and ΔEpaste-luting . Color measurements were repeated while the ceramic specimens were reduced to 0.7 mm and then 0.5 mm in thickness.

RESULTS: The means of ΔEluting were 0.69 ± 0.21, 1.27 ± 0.48, and 1.40 ± 0.57 for the 1.0, 0.7, and 0.5 mm thicknesses, respectively. Two-way ANOVA revealed that ΔEpaste-luting values were significantly affected by the colors of luting composites and veneer thickness (p < 0.001). Lighter shades of luting composites showed less influence on ΔEpaste-luting values.

CONCLUSIONS: Luting composites could slightly modify the final color of ceramic veneers. Color matching of a try-in paste to the corresponding luting composite was not always achieved in the 0.7 or 0.5 mm thicknesses.