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Three dimensional study of tooth enamel formation : change of structure and constitutions.

牙釉质形成的三维研究：结构和构成的变化。

基本信息

批准号：
11671793
负责人：
WAKITA Minoru
金额：
$ 2.05万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The smallest constitution unit of the tooth enamel can be histologically observed is an enamel prisms.Because of the properties ofspecimen, preparation of specimens is difficult, and examination methods are ristricted. Accordingly it was provided as a result only that it was known by a conventional methods as at the past. Therefore there are few studies on the tooth enamel, and it is necessary for revitalization on this research area. Tooth enamelis consisited of more than 95% of mineral which are mainly aggregation of small crystallites called as hydroxyapatite. Because these crystallites arrange according to one constant rule, and the nature of this rule in three dimensions appeared well generally known morphology of enamel in a section of tooth.These relationship between arrangement of those crystallites and histology of tooth enamel are analyzed in detail by WAKITA.They did detailed inspection about a relationship between crystallite arrangement in enamel and the structure of amalo … More blasts, and they proved that a spatial form of Tomes' processes was crucial element which decided a crystallite arrangement. They proved moreover them by the computer simulation, and concluded that the many histology of tooth enamel show the fossilized structure of the Tomes' prcesses in three dimension. Based on the diameter of Tomes' processes, they set various numerical value as basics condition to do computer simulation. When a simulation is done, these numerical figures are selected proper numerical value, but length of crystallites sets it as temporary length. Because the nature of length of hydroxyapatite crystallites, which consist of tooth enamel, is indistinct still. Various guesses and a trial of logical explanation on this problem are done, but, as for the length of crystallization, it is not shown yet critical numerical value.Length of crystallization is going to be examined using a simulation system of Wakita in this study. As a result it was shown that length of crystallites in range of this simulation included a constant limit. Less

牙釉质的最小构成单位是釉柱，由于标本的性质，标本制备困难，检查方法受到限制。因此，作为结果，它仅被提供为如过去那样通过常规方法已知。因此，对牙釉质的研究较少，有必要振兴这一研究领域。牙釉质由95%以上的矿物组成，矿物主要是被称为羟基磷灰石的小晶粒的聚集体。由于这些微晶按照一个恒定的规则排列，并且这种规则在三维空间中的性质表现出牙齿切片中众所周知的釉质形态。Wakita详细分析了这些微晶排列与牙釉质组织学之间的关系。他们对釉质中微晶排列与牙釉质结构之间的关系进行了详细的检查。 ...更多信息爆炸，他们证明了Tomes的过程的空间形式是决定微晶排列的关键因素。他们还通过计算机模拟证实了这一点，并得出结论，牙釉质的许多组织学显示了Tomes过程的三维结构。以Tomes突起直径为基础，设定各种数值作为基本条件进行计算机模拟。当模拟完成时，这些数值被选择为适当的数值，但微晶的长度将其设置为临时长度。由于作为牙釉质组成部分的羟基磷灰石晶体的长度性质尚不清楚。对这个问题进行了各种猜测和逻辑解释的尝试，但是，至于结晶的长度，它还没有显示出临界数值。本研究将使用Wakita的模拟系统来检查结晶的长度。结果表明，在该模拟范围内的微晶长度包括恒定的极限。少