Influence of different surface treatments on two-body wear and fracture load of monolithic CAD/CAM ceramics

Objectives To investigate two-body wear (2BW) and fracture load (FL) of monolithic ceramics after different surface pretreatments. Materials and methods Zirconia (MOZ), lithium-disilicate (LIT), and leucite-reinforced (LEU) specimens ( n = 60/group) were manufactured with CAD/CAM-technology and underwent ( n = 15/subgroup): 1) grinding + polishing (GrPo), 2) grinding + glazing (GrGz), 3) grinding (Gr), or 4) glazing (Gz). Scanning electron microscope ( n = 3/subgroup) and 3D measurements of the ceramic crowns and antagonists ( N = 180) were performed to determine 2BW before and after 120,000/1,200,000 masticatory cycles. FL was examined for all specimens ( N = 180). Data were analyzed using Kolmogorov-Smirnov, one-way ANOVA, Scheffé post hoc, Kruskal-Wallis, Mann-Whitney-U, and Wilcoxon ( p