Ichijo T, Yamashita Y, Terashima T
Tokyo Medical and Dental University, Tokyo, Japan.
Dent Jpn (Tokyo). 1990;27(1):11-6.
In a series of studies to investigate the structural features of biological crystals, using transmission electron microscope, the observations have been made on the shape and arrangement of the cross-sectioned crystal obtained from cross sections through the body of adult human enamel rod, in the surface layer, and in the middle and deep layers. The shapes of the cross sectioned crystals in the surface layer of the enamel are generally different from those in the middle and deep layers. In the surface layer of the enamel, the cross sectioned crystals show a considerable variation in shape and size, and have an irregular shape. The crystals are densely packed. Each crystal is adjacent to the neighboring one, and usually, the arrangement of crystals have an appearance rather like a "stone wall". In contrast, the cross sectioned enamel crystals in the middle and deep layer, are somewhat small than those in the surface layer, and have greater gaps between the crystals. In the middle and deep layers of the enamel, it is rare for the shapes of the crystals to be irregular, therefore, they retain their original shape, most of which are long and hexagonal.
在一系列旨在研究生物晶体结构特征的研究中，使用透射电子显微镜，对从成人牙釉质棒体的横截面、表层以及中层和深层获得的晶体横截面的形状和排列进行了观察。牙釉质表层横截面晶体的形状通常与中层和深层的不同。在牙釉质表层，横截面晶体的形状和大小有相当大的变化，且形状不规则。晶体紧密堆积。每个晶体与相邻晶体相邻，通常晶体的排列看起来颇像一堵“石墙”。相比之下，中层和深层的牙釉质横截面晶体比表层的稍小，晶体之间的间隙更大。在牙釉质的中层和深层，晶体形状很少不规则，因此它们保持其原始形状，其中大多数是长六边形。
