Color stainability of CAD/ XXXX and nanocomposite resin materials.

@entity1091 @entity5380
STATEMENT OF PROBLEM: The color stainability of recently introduced computer-assisted design/computer-assisted manufacturing (CAD/ @entity5380 ) hybrid ceramic and resin nanoceramic is unknown. PURPOSE: The purpose of this in  vitro study was to compare the effect of coffee staining on the color of 3 different CAD/ @entity5380 restorative materials and a nanocomposite resin. MATERIAL AND METHODS: Specimens from a hybrid dental ceramic (VITA Enamic), a resin nanoceramic (Lava Ultimate), a @entity1091 disilicate glass ceramic (IPS e.max CAD), and a nanocomposite resin (Filtek Supreme Ultra Universal) were evaluated for color change due to thermocycling in coffee (n=5). Specimens 0.5 to 0.7 mm and 1 to 1.2 mm in thickness were thermocycled for 5000 cycles. CIEDE2000 color differences (  E00) due to thermocycling in coffee were calculated using the color coordinates obtained from a spectroradiometer. ANCOVA was used to analyze the color differences among the materials with thickness as the covariate. Significant differences at average thickness were analyzed with the Tukey-Kramer test. RESULTS: For color difference due to staining, thickness was a significant covariate (P<.001). Regarding the analysis of color differences, every pair of the tested materials was significantly different (P<.001). Least squares means of color differences (  E00) at mean thickness were 4.34 for the nanohybrid composite resin, 3.66 for the resin nanoceramic, 1.35 for the hybrid ceramic, and 0.43 for the @entity1091 disilicate ceramic. CONCLUSION: When exposed to hot and cold coffee, the color change was beyond clinical acceptability for the tested resin nanoceramic and nanocomposite resin materials. The average color change of the hybrid ceramic was clinically perceivable over the tested thickness values. The color change of @entity1091 disilicate ceramic was not clinically perceivable at any tested thickness.
