An investigation into the effect of try-in pastes, uncured and cured resin cements on the overall color of ceramic veneer restorations: an in vitro study.

Objectives: The aim of this study was to assess how different shades of try-in pastes, uncured and cured resin cements influence the overall color of porcelain veneer restorations.

Methods: Porcelain veneers of shade Vita 1M1 VM7 and 1mm thick were applied to bovine teeth using three shades of resin cement and their try-in paste produced by three manufacturers. Analysis of variance was carried out on the color difference values (ΔE*) between the Aquagel and both the try-in paste and cured resins. An assessment of the clinical significance of ΔE* between the try-in paste and the cured resin and also between the uncured and cured resin was made.

Results: There were statistically significant differences in veneers' colors when using different shades of both Calibra and Nexus resin cements (p<0.05). Also, statistically significant differences were noticed when using different shades of both Rely-X and Nexus try-in pastes (p<0.05). Color differences produced between the try-in pastes and the corresponding shades of cured resin cements ranged from ΔE* 1.05 to 3.34. The color differences between uncured and cured resins of the same shade ranged from ΔE* 0.78 to 1.41.

Conclusions: Different colored try-in pastes and resin cements produced color changes which are clinically useful in changing the color of veneer restorations and therefore aid color matching to adjacent dentition. Clinically significant differences were found between try-in pastes and the cured resin of the same shade, however, there were relatively small changes measured between uncured and cured resins. The color match achieved by the try-in paste has to be treated with caution and further assessment of the restoration made with the resin in place before curing is recommended.