上颌第一磨牙远中移动时牙周应力分布的三维有限元分析
Analysis of Stress in the Periodontal Tissue of the Maxillary First Molar on Distal Movement by Finite Element Method
作者：李志华,陈扬熙,刘剑,吴建勇,朱玉芬
Author：LI Zhihua*,CHEN Yangxi,LIUJian,et al.
收稿日期：2003-08-25 年卷（期）页码：2003,21(04):267-
期刊名称：华西口腔医学杂志
Journal Name：West China Journal of Stomatology
关键字：上颌第一磨牙,牙周膜,应力分析,有限元法,
Key words：maxillary first molar,periodontal tissue,stress distribution,finite element method,
基金项目：
中文摘要
目的 研究上颌第一磨牙远中移动时其牙周组织应力分布情况,探讨上颌第一磨牙远中移动的最佳荷载方式,为临床应用提供生物力学基础。方法 采用正常的头颅骨,通过螺旋CT扫描的方法建立上颌第一磨牙的三维有限元模型。使用4种不同负荷方式对模型进行加载,计算上颌第一磨牙远中移动的最佳荷载方式。结果 上颌第一磨牙远中移动时,不同的加载所产生的牙周的应力分布不同。在上颌第一磨牙颊面中心附近施加远中力并结合抗衡力矩(Mt/F=10, Mr/F=6)可以在牙周膜的远中面获得平均分布的低压应力,它能使牙齿倾向于整体移动。结论 正确的荷载方式可消除旋转和倾斜,使上颌第一磨牙整体远中移动。
英文摘要
Objective The aim of this studywas to analyse the stress distribution in the periodontium of the maxillary first molar and to search optimal loads patternwhen distal movementto provide biomechanical basis forthe clinical practice.Methods By spiral CT scanning, a three-dimensional finite element model of the maxillary first molarwas established, and then four differ- ent load patterns were added to the molar to obtain the optimal load partern for molar bodily distal movement.Results Different loads lead to different stress distributions when distal movement.Conclusion A distalizing force combined with a countertipping moment (Mt/F=10) and a counterrotationmoment(Mr/F=6) can lead to a lower and uniform stress on the distal side of the peri- odontal ligament,it implys a tendency of translation of the maxillary first molar.
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