In vitro color stainability and relative translucency of CAD-CAM restorative materials used for laminate veneers and complete crowns

• Published in: The Journal of prosthetic dentistry 2019-08, Vol.122 (2), p.160-166
• Main Authors: Arif, Rabia, Yilmaz, Burak, Johnston, William M.
• Format: Article
• Language: English
• Subjects: Dentistry
• ISSN: 0022-3913; 1097-6841
• DOI: 10.1016/j.prosdent.2018.09.011

Assessing the long-term stainability and durability of restorative materials is an important parameter for determining clinical success and longevity. Information remains limited regarding the color stainability and translucency of the recently introduced ceramic materials for restorative treatment. The purpose of this in vitro study was to compare the effect of cyclic immersion in hot and cold coffee on the color stainability and translucency of 6 computer-aided design and computer-aided manufacturing (CAD-CAM) restorative materials at thicknesses which represent a laminate veneer and a complete crown. CAD-CAM restorative materials including zirconia-reinforced lithium silicate ceramic (Celtra Duo), lithium disilicate glass-ceramic (IPS e.max CAD), polymerized resin nanoceramic (Lava Ultimate), integrated ceramic and acrylate polymer network material (VITA ENAMIC), zirconia-reinforced lithium silicate (VITA SUPRINITY), and zirconia (VITA YZ HT) were studied in 2 thicknesses for laminate veneer (0.7 mm) and complete crown application (1.3 mm to 1.5 mm). For each specimen, color difference on a gray backing was calculated using a spectroradiometer between its baseline color and after 6000 cycles of coffee thermocycling. The colors of the specimens on the black and white backings were used to calculate the relative translucency parameter from the CIEDE2000 color difference formula. An ANOVA and the Bonferroni-corrected Student t tests were used for testing statistical significance (α=.05). No difference was found among the means of color change after coffee thermocycling between any 2 materials for the crown thickness (P>.999), and no difference was found among the means of color change between the 2 thickness groups within each material (P≥.187). However, the mean color change of the resin nanoceramic material in laminate veneer application (0.7 mm) was greater than that of every other material in the veneer thickness group (P