Departamento de Ingeniería Mecánica, Energética y de los Materiales, Universidad de Extremadura, 06006 Badajoz, Spain.
Department of Biology, Saint Michael's College, Colchester, VT 05439, USA.
J Mech Behav Biomed Mater. 2018 Apr;80:77-80. doi: 10.1016/j.jmbbm.2018.01.024.
Results are presented for wear tests on human molar enamel in silica particle mediums. Data for different particle concentrations show severe wear indicative of material removal by plasticity-induced microcrack formation, in accordance with earlier studies. The wear rates are independent of low vol% particles, consistent with theoretical models in which occlusal loads are distributed evenly over all interfacial microcontacts. However, perhaps counter-intuitively, the wear rate diminishes substantially at higher vol%. This is attributed to a greater proportion of lower-load microcontacts transitioning into a region of mild wear, where microcracking is suppressed. Implications of these results in relation to evolutionary biology and dentistry are explored.
本文展示了在二氧化硅颗粒介质中对人磨牙珐琅质进行磨损测试的结果。不同颗粒浓度的数据表明，存在严重磨损，表明材料通过塑性诱导微裂纹形成而被去除，这与早期研究一致。磨损率与低体积%颗粒无关，与理论模型一致，其中咬合载荷均匀分布在所有界面微接触上。然而，也许与直觉相反，磨损率在较高体积%时会大幅降低。这归因于更多低载荷微接触向轻度磨损区域过渡，微裂纹在此处受到抑制。这些结果在进化生物学和牙科学方面的意义进行了探讨。
