Color stability of CAD/CAM Zirconia ceramics following exposure to acidic and staining drinks

Abstract
The aim of this in vitro study was to evaluate the color stability of CAD/CAM Zirconia ceramics following exposure to acidic drink (Coca Cola) and after exposure to staining solution (coffee). All the samples were immersed in different staining solutions over a 28-day test period. A colorimetric evaluation according to the CIE L*a*b* system was performed by a blind trained operator at 7, 14, 21, 28 days of the staining process. Shapiro Wilk test and Kruskal-Wallis ANOVA were applied to assess significant differences among restorative materials. Paired t-test was applied to test which CIE L*a*b* parameters significantly changed after immersion in staining solutions. One week immersion in acidic drink did not cause a perceivable discoloration for all restorative materials (?E < 3.3). Subsequent immersion in coffee affected color stability of all Zirconia samples, even if Kruskal-Wallis ANOVA found significant differences among the various restorative materials. The ?Es of CAD/CAM Zirconia ceramics after immersion in coffee varied among the products, but color integrity is not affected by contact with acidic drinks.
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Bibliographic reference
Colombo, Marco ; Cavallo, Marco ; Miegge, Matteo ; Dagna, Alberto ; Beltrami, Riccardo ; Chiesa, Marco ; Poggio, Claudio. Color stability of CAD/CAM Zirconia ceramics following exposure to acidic and staining drinks. En: Journal of Clinical and Experimental Dentistry, 9 11 2017: 1297-1303