Optical properties of zirconia-reinforced lithium silicate veneers obtained with CAD/CAM milling and hot-pressing techniques: a comparative in vitro study

Background and aims. Dental veneers have become increasingly required among patients, but little is known about the optical properties of obtained from same ceramic material through different processing techniques. 
 Methods. In this study we compared translucency opalescence parameters zirconia-reinforced lithium silicate (ZLS) restorations fabricated CAD/CAM milling hot-pressing techniques on upper central incisor. Eighty specimens divided into 8 groups (n=10) were sectioned (Celtra Duo) heat pressed Press) to obtain 0.8 mm thickness. The calculated color difference against backgrounds. Analysis variance, one way ANOVA post-hoc multiple comparison tests used evaluate compare material, with a significance level p < 0.05. Results. method had significant effect parameters. Celtra Duo HT proved be highest transparency degree. technique led higher opacity than technique. Conclusions. For bio-mimetic aesthetic prosthetic restoration, materials must as real tooth. results revealed that high ZLS hot pressing was choice, it fulfilled these requirements.