Comparative and Histogenetics study on origin, development and evolution of enamel structure on human tooth

对釉质结构的起源和发展进行了考察，并对其意义进行了讨论。鳄鱼釉质成釉细胞在釉质的晶体单元中形成成团(组)。每个晶体单元的边界不对应于成釉细胞群的边界，也不同于Hunter-Schreger带的边界。在原始哺乳动物的釉质棱体中，随着发育的发展，釉质棱柱呈卷曲状，釉质小管消失。提示成釉细胞的运动受成牙本质细胞过程的影响(或控制)。在原始哺乳动物中，Hunter-Schreger带表现为一组孤立的釉质棱柱群，从化石到新生的哺乳动物。岛棱柱组在牙冠被包围的地方水平方向扩展。每种哺乳动物的扩增模式各不相同，但水平型Hunter-SC…更多的hreger条带是许多哺乳动物的基本模式。这就是釉质棱镜的“分组”。釉质棱镜不仅在Hunter-Schreger波段的一个区域内运行，而且还可以将航向从一个区域切换到另一个区域。其他珐琅棱镜图案只在区域边界上运行。在用免疫细胞化学方法对狗等牙胚进行检查时，肌动蛋白在外釉上皮、星状网状层、中间层和成釉细胞中的定位为Hunter-Schreger带。角蛋白的定位与釉质棱柱的定位相似。可见，釉器的聚集和移动形成了Hunter-Schreger带，肌动蛋白在Tome‘s的成釉细胞过程中的定位除了成组外，还表现为原始运动。研究结果表明，大通氏过程中的舞蹈形成了釉质棱柱排列的模式，即所谓的舞蹈。今后将对控制这些运动的因素进行进一步的研究。

The origin and the development of the enamel structure were examined, and the meaning was discussed.The ameloblasts of crocodilian enamel forms groups (Grouping) admitted to the crystal unit in enamel. The boundary of each crystal unit is not corresponding to boundaries of the ameloblasts groups, and also differenced to the boundary of Hunter-Schreger band. It is clear that the boundary relates to the enamel tuft and lamella of mammalian enamelThe enamel prism in primitive mammals shows winding run with disappearance of enamel tubules along with the development. It is suggested the movement of the ameloblast is influenced (or controled) by the odontoblastic process. The Hunter-Schreger band appears as sets of islanded of enamel prisms groups in primitive mammals as compare from fossil to resent mammals. The island prism groups expand horizontal direction where the tooth crown is surrounded. The expanding patterns were variable in each mammalian species, but horizontal type of Hunter-Sc … More hreger band is basic pattern in many mammals. This was named 'Grouping' of the enamel prism. The enamel prism runs not only in one zones of Hunter-Schreger band but also changes the course one to the other zones. Other enamel prism pattern runs only the boundary of zones. This was named 'Dancing' of the enamel prism.In an examination of tooth germs of dog etc. with the immunocytochemical method, the localization of the actin showed the grouping form in the outer enamel epithelium, stellate reticulum, stratum intermedium, and ameloblasts as Hunter-Schreger bands.The keratins showed similar localization of 'Grouping' of the enamel prism. It is clear that that grouping and moving of enamel organ forms the Hunter-Schreger bands.The actin localization in Tome's process of amelobast showed original movement besides grouping. It is showed that the dancing of Tome's process formed the patterns of enamel prism arrangement, so called 'Dancing'Further studies to clarify the factor to control these movements will have done in the future. Less