The effect of coffee thermocycling and color correction serum on the colorimetric properties and hardness of CAD‐CAM restorative materials

Abstract Purpose To compare the stainability, translucency, opalescence, whiteness, gloss, and hardness of 4 computer‐aided design and computer‐aided manufacturing (CAD‐CAM) restorative materials after simulated coffee drinking and color correction. Materials and Methods Four CAD‐CAM blocks were investigated (n = 40): resin nanoceramic (Cerasmart, CS), polymer‐infiltrated ceramic network (Vita Enamic, VE), lithium disilicate glass ceramic (IPS e.max CAD, EC), and zirconia‐reinforced lithium silicate glass ceramic (Vita Suprinity, VS). The color stability (Δ E 00 ), relative translucency (RTP), opalescence (OP), and whiteness stability (ΔWI D ) were measured with a spectrophotometer. Gloss (GU) was recorded with a gloss meter, and hardness (HM) was detected with a Martens hardness testing device. The specimens were observed at baseline (T0), after coffee thermocycling (CTC) (T1), and after color correction (T2). Δ E 00 was analyzed by two‐way ANOVA, ΔWI D was analyzed with one‐way ANOVA, and RTP, OP, WI D , GU, and HM were assessed with repeated ANOVA to evaluate the effects of material type, treatment, and their interactions on the tested properties. Post hoc pairwise comparisons were assessed by Tukey HSD and Student t ‐tests ( α = 0.05). Results Δ E 00 , WI D , OP, GU, and HM outcomes were significantly impacted by material type ( p < 0.001) and treatment ( p ≤ 0.028), whereas ΔWI D and RTP were affected by material type ( p ≤ 0.03). CS exceeded the Δ E 00 perceptibility threshold at T1. VS exhibited the highest stain resistance, RTP, and HM, and the least was in VE and CS. Color correction serums reversed CTC‐induced staining among VS and VE ( p < 0.001). Conclusions Zirconia‐reinforced lithium silicate glass‐ceramics demonstrated superior color stability and hardness when subjected to coffee thermocycling and color correction serum.