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Structural changes of the jaw bones with growth, aging and loss of the teeth - Three-dimensional reconstruction using micro-CT -

随着牙齿的生长、老化和脱落，颌骨的结构发生变化 - 使用显微 CT 进行三维重建 -

基本信息

批准号：
09470396
负责人：
IDE Yoshinobu
金额：
$ 7.81万
依托单位：
TOKYO DENTAL COLLEGE
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1999
项目状态：
已结题

项目摘要

The jaw bones are received the complicated forces not only through the muscles, but through the teeth directly. Therefore, it is thought that the morphology of the jaw bones are greatly effected by the oral conditions. A traditional method to study the internal structure of the bone is to make serial sections after embedding the specimen in the resin. This method, however, contains a couple of problems such as the destruction of the specimen and one way observaion of the structure. In this study, the morphological changes of the mandibula with loss of the teeth are observed. Furthermore, the three dimensional changes of the trabecular bones observed by micro-CT are shown.The jaw bones are made of a complex composition since they consist of the alveolar sockets to contain the dental roots. The trabecular bone structures of the mandibula are constructed in order to support the teeth. It is observed that the trabecular bones appeared to plate-like shape rather than rod-like shape in the three dimensional observation using micro-CT. With loss of the teeth, the height of the mandibula is rapidly shortened. And in the internal structures, both width and volume of the trabecular bone within the substantia spongiosa are reduced and the direction of trabecular bone is making the irregular course. In addition, it has a tendency that plate-like shaped trabecular bones change into rod-like shaped ones.Based on these findings, it is suggested that maintenance of the intact teethis important to keep the normal morphology of the mandibula.

颌骨不仅通过肌肉，而且直接通过牙齿接受复杂的力。因此，人们认为颌骨的形态受口腔条件的影响很大。研究骨内部结构的传统方法是将标本包埋在树脂中后制作连续切片。但这种方法存在着试样破坏和结构单向观测等问题。本研究观察了牙齿缺失后下颌骨的形态学变化。此外，通过micro-CT观察到的骨小梁的三维变化显示。颌骨是由一个复杂的组成，因为它们包括牙槽窝容纳牙根。下颌骨的骨小梁结构是为了支撑牙齿而构建的。在micro-CT三维观察中，观察到松质骨呈板状而不是杆状。随着牙齿的脱落，下颌骨的高度迅速缩短。在内部结构上，松质内骨小梁的宽度和体积均减小，骨小梁的走向不规则。此外，板状骨小梁有向杆状骨小梁转变的趋势，提示保持完整的牙齿对保持下颌骨的正常形态具有重要意义。