Developmental Studies on the Three-Dimensional Arrangement of Enamel Prism; Approach on the Crystallographic Aspects.

用计算机图形模拟技术研究了托氏突形状与釉质微晶排列的关系，特别是研究了微晶长度对釉质棱柱(棱柱体)中微晶排列的影响。这项研究旨在证实Wakita和他的同事最近给出的理论基础。现有的研究表明，当他们在Tomes过程的S面上推出时，晶体的长度是有限的。这种局限性与S面的表面结构有关。也就是说，当在给定的S面上产生的微晶的长度超过某些方面时，它就会越过相邻的微晶。这意味着这种现象只能在CRT上出现，不可能在棱镜中既能二维又能三维。因为实际棱镜中的每个微晶不仅有其长度，而且还有其宽度和厚度，相邻微晶之间的这种交叉是由于它们所在的Tomes过程的S面的条件与微晶长度密切相关所致。也就是说，在曲率较小的S面上产生的微晶与相邻的微晶发生交叉，尽管它们的长度比同一S面上的其他区域的晶体要短。

The relationship between the shape of the Tomes' process and the arrangement of enamel crystallites was examined by use of the computer graphic simulation technique, especially on the effects of length of crystallites to the arrangement of crystallites in the enamel prism (prism body). This studies aimed to confirm the theoretical bases recently given by Wakita and his coworkers.Present studies revealed that there was limit in the length of crystallites, when they educe on the S-face of the Tomes' process. This limitation was related to the surface structure of S-face of Tomes' process. That is, when the length of crystallite which educes on the given S-face came over the certain aspects, it crosses over the neighboring crystallites. It means that this phenomenon is capable only be on the CRT and it is impossible to be two-dimensionally as well as three-dimensionally in the prism. Because each of crystallites in actual prism have not only its length but also its width and thickness.These cross over between neighboring crystallites is resulted by the close relationship between the condition of the S-face of the Tomes' process on which they educe, and the crystallite length. That is, the crystallites educed on the S-face with small curvature occur cross over with neighboring ones, although their length are shorter than that educed on other area of the same S-surface.