ENAMEL STRUCTURE AND MICROWEAR - AN EXPERIMENTAL-STUDY OF THE RESPONSE OF ENAMEL TO SHEARING FORCE
ENAMEL STRUCTURE AND MICROWEAR - AN EXPERIMENTAL-STUDY OF THE RESPONSE OF ENAMEL TO SHEARING FORCE
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DOI：
10.1002/ajpa.1330850106
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发表时间：
1991-05-01
影响因子：
2.8
通讯作者：
MAAS, MC
中科院分区：
文献类型：
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作者：
MAAS, MC
牙釉质微观结构的各向异性断裂和差异磨损特性代表了可能掩盖牙齿微磨损和饮食之间预测关系的因素。 为了评估牙釉质结构对微磨损的影响，这项体外实验研究考察了三个因素对磨损的相对贡献：1) 微观结构的物种差异，2) 相对于牙釉质棱柱和微晶的剪切力方向，3) 磨料颗粒的尺寸。 狐猴、绵羊、人和鳄鱼的牙齿分别代表棱柱形图案 1、2 和 3 以及非棱柱形牙釉质的结构类别，通过剪切力（具有平行于磨损表面的分量的力）进行磨损，并通过扫描电子显微镜进行检查。 对于非棱柱形样品，条纹宽度随着颗粒尺寸的增加而增加，但对于棱柱形样品则不然。 仅在一些棱柱釉质中，相对于棱柱和微晶取向的剪切方向对条纹宽度有显着影响。 棱柱形和非棱柱形牙釉质对磨损的不同反应反映了结构的影响，但是在微晶的组织水平而不是棱柱本身。 这种相互作用在一定程度上解释了条纹宽度无法区分具有不同饮食习惯的动物。 异方差和偏离正态性也可能会混淆微磨损变量的参数分析。 棱柱状牙釉质中微晶取向的变化可能通过牙齿功能不同区域的差异磨损特性有助于最佳的牙齿功能。
The anisotropic fracturing and differential wear properties of enamel microstructure represent factors that can obscure the predictive relationship between dental microwear and diet. To assess the impact of enamel structure on microwear, this in vitro experimental study examines the relative contributions to wear of three factors: 1) species differences in microstructure, 2) direction of shearing force relative to enamel prisms and crystallites, and 3) size of abrasive particles. Teeth of Lemur, Ovis, Homo, and Crocodylus, representing, respectively, the structural categories of prismatic patterns 1, 2, and 3 and nonprismatic enamel, were abraded by shearing forces (forces having a component directed parallel to abraded surfaces) and examined by scanning electron microscopy. Striation width increased with particle size for nonprismatic, but not for prismatic, specimens. Direction of shear relative to prism and crystallite orientation had a significant influence on striation width in only some prismatic enamels. The different responses of prismatic and nonprismatic enamels to abrasion reflect the influence of structure, but at the level of organization of crystallites rather than prisms per se. Such interactions explain in part the inability of striation width to discriminate among animals with different dietary habits. Heteroscedasticity and deviations from normality also may confound parametric analyses of microwear variables. Variation in crystallite orientation in prismatic enamels may contribute to optimal dental function through the property of differential wear in functionally distinct regions of teeth.