Objective To compare the wear between the enamel and two types of dental decoration porcelains for all- ceramic restorations（Vita- alpha, Vintage AL）. Methods Friction coefficients, wear scar width, element concentrations and wear surface evolution were considered relatively to the tribology of that in vivo situation. The wear scars of the samples were characterized by means of dynamic atomic force microscopy（DFM）. The different element concentrations of the surface before/after the wear test were determined with energy dispersion spectrometry（EDS）. Results The friction coefficient varied from time in each kind of material. The statistical differences between materials were observed in wear scar width and properties of materials（P
