Effects of Substrate and Cement Shade on the Translucency and Color of CAD/CAM Lithium-Disilicate and Zirconia Ceramic Materials.
Allegra CombaGaetano PaoloneAndrea BaldiAlessandro VichiCecilia GoracciGiulia BertozziNicola ScottiPublished in: Polymers (2022)
The aim of this in vitro study was to evaluate the effects of substrate and cement shades on the translucency and color of lithium-disilicate and zirconia CAD/CAM materials. Two light-cured resin cements (RelyX Veneer Cement; 3M; Choice 2 Veneer Cement; Bisco Dental) with a standardized thickness (0.1 mm) were tested in combination with two different monolithic CAD/CAM materials (E-Max CAD (LI 2 SI 2 O 5 ); Ivoclar Vivadent; Katana (ZrO 2 ); Kuraray-Noritake Dental) on two different colored composite substrates used as a dentin (Filtek Supreme XTE; 3M); for a total of 12 combinations ( n = 10). The specimens' color was measured with a spectrophotometer (Spectroshade; MHT). Measurements were taken using the CIELAB color coordinate system ( L *a*b* ) against black and white backgrounds. L *a*b* values were statistically analyzed for the variables Substrate, Ceramic, and Cement by applying a Three-Way ANOVA followed by the Tukey Test for post-hoc comparison ( p < 0.05). Translucency Parameter (TP) and Constant Ratio (CR) were assessed to evaluate translucency; acceptability and perceptibility thresholds (Δ E 00 1.8 and 0.8) were used. Statistically significant influence was found for factors ceramic material, cement shade, and substrate color ( p < 0.05). Unacceptable color differences were reported for Li 2 Si 2 O 5 . Opacity was significantly higher when white opaque cement shade was employed. Ceramic type and cement shade significantly influenced L *a*b* color coordinates. The final translucency and color of ceramic restorations can, therefore, be influenced by ceramic material, cement shade, and substrate color.