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The Achievement of the Optimal Force in Experimental Orthodontic Tooth Movement

正畸牙移动实验中最佳力的实现

基本信息

批准号：
08672354
负责人：
SATO Yoshiaki
金额：
$ 1.47万
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：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08672354/
关键词：
Tooth Movement Degenerated Tissue Periodontal Ligament Stress Analysis Tissue Response Rear Bone Resorption 応力分布有限要素法組織変化

项目摘要

The purpose of this sutdy is to investigate the optimal force under orthodontic tooth movement according to the histologic and biomecanical methods in the periodontal tissue. The results obtained were :1.Regeneration of the remaining degenerated tissue and bone under initial orthodontic force was delayd incident to readjusted orthodontic force. And this region was the center of rotation following readjusted force. The remaining degenerated tissue and bone reduced in size with time, but remained after the readjusted period. It is suggested that a reduction in force or bodily movement may be desirable to avoid tipping movement.2.The rear bone resorptions was observed widely at the site of the alveolar bone behind the degenerated tissue. These resorptions occurred in the perforating channels near the periodontal space. A part of the degenerated tissue passing to the large orifices of the channels was also observed. Many blood vessels and osteoclasts were located near the degenerated tissue.3.There is a close relationship between the morphology and distribution of blood vessels with the distribution of pressure in perforating channels.4.The specimen-specific finite element analysis showed that the degenerated tissue was formed around the peak of the compressive stress distribution. The minimum value of the peak was estimated to be more than -35kPa.

本研究的目的是通过对牙周组织的组织学和生物力学研究，探讨正畸牙齿移动时的最佳力值。结果表明：1.在初始正畸力作用下，残余的退变组织和骨的再生随着正畸力的重新调整而延迟。这一区域是调整力后的旋转中心。剩余的退化组织和骨的大小随着时间的推移而减少，但在重新调整期后仍然存在。结论：（1）下颌后牙骨质吸收主要发生在退变组织后方的牙槽骨部位，在退变组织后方的牙槽骨部位，可观察到广泛的后牙骨质吸收。这些吸收发生在牙周间隙附近的穿通通道中。还观察到一部分变性组织进入通道的大孔。血管的形态和分布与穿支通道内的压力分布有密切的关系。4.骨特异性有限元分析表明，退变组织形成于压应力分布峰值附近。峰值的最小值估计大于-35kPa。