Effect of Cement Translucency and Ceramic Thickness on the Resulting Colour Match of Zirconia-Reinforced Lithium Silicate Restorations Cemented over Dark-Coloured Substrate

Abstract

Objective: Vita Suprinity zirconia-reinforced lithium silicate dental ceramics were tested using various thicknesses and hues of resin cement to determine how well they could disguise colour. Materials and Methods: Fifty-four (Vita Suprinity) ceramic discs with different thicknesses (0.5, 1 and 1.5mm thickness) were used, eighteen discs in each group were then subdivided into two equal subgroups (n=9) according to the cement shade used (translucent or opaque), one discolored substrate (C4) was used. Translucency parameter (TP) and colour difference (∆E before and after cementation to the substrate) were evaluated by spectrophotometer. Results: The three groups of ceramic thicknesses did not differ statistically significantly in terms of the translucency parameter, however there was a statistically significant difference between the two investigated colours of resin cement (translucent and opaque). Between the three groups, there was no statistically significant difference in the colour change (∆E). Conclusions: Between the three various ceramic thicknesses that were employed, there was no statistically significant variation in the translucency parameter (TP). The colour changes (∆E) for the three dental ceramic thicknesses utilized were within the clinically acceptable range (3.33). Accordingly, no matter what colour the luting agent was, Vita Suprinity measured thicknesses showed enough colour masking capacity to cover up the discoloured substrate (C 4) that was being employed.