Abstract This article aims to evaluate and compare the fracture resistance of three CAD/CAM veneer materials—a polymer-infiltrated ceramic network (VE; Vita Enamic), a lithium disilicate glass-ceramic (LD; IPS e.max CAD), and a zirconia-reinforced lithium silicate ceramic (ZLS; Vita Suprinity)—before and after artificial accelerated aging. Sixty standardized epoxy resin replicas of a prepared maxillary central incisor were fabricated using a stereolithographic 3D printing technique and randomly allocated into three groups (n = 20): Vita Enamic (VE), IPS e.max CAD (LD), and Vita Suprinity (ZLS). Laminate veneers were designed digitally and milled using a five-axis CAD/CAM milling unit. After appropriate surface treatment, veneers were adhesively luted using light-cured resin cement. Each material group was subdivided into two subgroups (n = 10): no aging or artificial aging via thermocycling (10,000 cycles between 5 and 55°C). Fracture resistance was measured using a universal testing machine with loading at 135 degrees to the long axis at a crosshead speed of 1 mm/min. Data were analyzed using one-way ANOVA, independent t-tests, and two-way ANOVA (α = 0.05). Significant differences were observed among materials before and after aging (p 0.05). ZLS remained significantly superior to both LD and VE after aging (p < 0.05).
Borzangy et al. (Tue,) studied this question.