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The influence of curing mode and shade of resin cements on the color stability of minimum-thickness ceramic veneers after a three-year storage time in distilled water was evaluated in this study. Ninety-six 0.5-mm-thick feldspathic ceramic veneers (Mark II) were luted onto resin composite substrates (Filtek Z350 XT, shade A2E) with two light-cured (NX3 Light-cure and AllCem Veneer) and dual-cured resin cements (NX3 dual-cure and AllCem) in various shades. The specimens were stored in distilled water at 37°C. Color measurements were performed with a spectrophotometer at the following times: 1h and 24h; 7, 30, and 180 days; and 1, 2, and 3 years. Data for color difference (ΔE ab ) light-cured and dual-cured resin cements were analyzed by two-way ANOVA with repeated measures and Tukey’s test (α = 0.05). For the light-cured cements, the ΔE ab  values were as follows: NX3-Yellow (2.37±1.35) = ACV-A1 (2.40±1.21) = ACV-Trans (2.52±1.46) = ACV-E-Bleach M (2.56±1.42) = NX3-White (2.69±1.49) = NX3-Clear (2.98±1.68). The lowest ΔE values were found for 1 h (0.61±0.36) a , followed by 24 h (1.15±0.55) b  and 30 days (2.48±1.11) c . One year, 180 days, and 2 and 3 years presented higher ΔE ab  values (3.34±0.94, 3.52±1.04, 3.52±0.95 and 3.55±1.14, respectively) d . For the dual-cured cements, the ΔE ab  values varied as follows: NX3-Clear (2.32±1.24) a  = NX3-Yellow (2.37±1.32) a  = NX3-White (2.76±1.43) a  < AC-Trans (3.77±1.91) b  = AC-A3 (4.13±2.11) b  < AC-A1 (5.38±2.92) c . Considering time, the lowest ΔE ab  values were found for 1 h (0.48±0.25) a , followed by 24 h (2.13 ±0.83) b , 30 days (3.54±1.31) c , and 180 days (3,70±1.73) c . The follow-up times of 1 (4.43±2.15) d , 2 (5.02±1.74) e , and 3 years (4.90±2.12) e  presented higher ΔE ab  values. This study demonstrated that light-cured resin cements were less susceptible to color change than dual-cured cements. After 2 years of follow-up, all cements presented ΔE ab  values above the acceptability threshold.

Color stability of ceramic veneers as a function of resin cement curing mode and shade: 3-year follow-up