The objective of this study is to elucidate the interdependence of competing mechanical degradation processes in biphasic dental materials with ceramic constituents in the region of high-pressure occlusal loading. It is hypothesized that wear resistance in this region correlates inversely with basic material parameters (modulus, hardness, toughness, strength) evaluated from 'standardized' test specimens. Ball-on-flat wear tests in simulation of oral function are used to quantify susceptibility to protracted sliding contact damage. Wear rates for this class of dental material tend to increase with quasistatic parameter values, so the latter do not provide a reliable guide to longevity. The generation of severe-wear facets involves cumulative quasiplastic deformation and microcrack coalescence at the grain level. It is implied that interplay between wear and fracture mechanisms should be an important consideration in future microstructural design of dental ceramics, especially in the quest to balance durability against esthetics.

这项研究的目的是阐明在高压咬合负荷区域，双相牙科材料中竞争性机械降解过程与陶瓷成分之间的相互依赖性。假设该区域的耐磨性与从“标准”试样中评估的基本材料参数（模量，硬度，韧性，强度）成反比。模拟口腔功能的扁球磨损试验用于量化长期滑动接触损伤的易感性。这类牙科材料的磨损率会随着准静态参数值的增加而增加，因此后者不能提供长寿的可靠指南。严重磨损面的产生涉及晶粒水平的累积准塑性变形和微裂纹合并。