Impact of resin composite cement on color of computer-aided design/computer-aided manufacturing ceramics

Objective To analyze the impact of the color of a resin composite cement (RCC) on the optical properties of different computer-aided design and computer-aided manufacturing (CAD/CAM) ceramics. Materials and methods Specimens (N = 220, thickness: 0.9 +/- 0.03 mm) were fabricated from: leucite (Initial LRF Block/IPS Empress CAD), lithium disilicate (Amber Mill/IPS e.max CAD), lithium metasilicate (Celtra Duo), and lithium alumina silicate ceramic (n!ce) in translucency levels HT and LT. All specimens were bonded with an RCC (Light+/Warm+). Color was analyzed (spectrophotometer) initially as well as after bonding of RCC with CAD/CAM ceramics using CIELab and CIEDE2000. Kolmogorov-Smirnov test, one-way ANOVA and t test served for analyzing (alpha = 0.05). Results Highest impact on Delta E presented the choice of ceramic (eta(2)(p) = 0.155/p < 0.001), followed by translucency level (HT/LT; eta(2)(p) = 0.050/p = 0.001) as well as interaction between ceramic and translucency level (eta(2)(p) = 0.175/p < 0.001). Delta E00 was mainly influenced by the choice of ceramic (eta(2)(p) = 0.490/p < 0.001), the shade of resin composite (eta(2)(p) = 0.031/p = 0.012) as well as the interaction between ceramic and resin composite (eta(2)(p) = 0.258/p < 0.001). Conclusions RCC shades presented differential impacts on color change of CAD/CAM ceramics. Clinical significance Knowledge of the impact of available RCC shades on different CAD/CAM ceramics is crucial for an esthetic outcome and proper selection of ceramic restorations.

Automated summary

The color of resin composite cement has different impacts on the color change of CAD/CAM ceramics. The choice of ceramic and translucency level are important factors affecting color change. Understanding the effects of available RCC shades on different CAD/CAM ceramics is crucial for achieving optimal esthetic outcomes and selecting ceramic restorations appropriately.