The influence of PDL principal fibers in a 3-dimensional analysis of orthodontic tooth movement
The influence of PDL principal fibers in a 3-dimensional analysis of orthodontic tooth movement
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DOI：
10.1067/mod.2001.116085
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发表时间：
2001-09-01
影响因子：
3
通讯作者：
Katona, TR
中科院分区：
文献类型：
--
作者：
Qian, HH;Chen, J;Katona, TR
机械载荷对牙齿-牙槽复合体的影响在正畸学中是特别值得关注的。阻力中心(Cres)和旋转中心(CROT)的概念被用来表征牙齿对正畸载荷的反应。与正畸牙齿移动相关的力学环境(应力和应变)是骨适应生理学中一个独特的模型。许多复杂的有限元模型被用来计算牙齿在牙槽骨和牙周膜(PDL)内的移动和应力分布。总的来说，PDL被理想化为均匀的各向同性材料。在这个项目中，建立了牙齿/下颌骨/下颌骨的三维有限元模型，在这样的分析中，第一次考虑了牙周膜的主纤维结构。参数分析表明，纤维取向和力学性能对CRES和CROT的位置以及骨和PDL基质内的应力模式没有太大影响。然而，主纤维的缺失不仅会产生不同的应力大小，而且会产生不同的应力模式。此外，非纤维相关的Cres和CROT与纤维影响中心的簇有相当大的分离。得出的结论是，尽管缺乏关于纤维的可靠信息，但在有限元模型中包括“通用”主纤维可能比完全不包括它们更现实。
The effects of mechanical loads on the tooth-alveolus complex are of particular concern in orthodontics. The concepts of center of resistance (CRes) and center of rotation (CRot) are used to characterize tooth responses to orthodontic loads. The mechanical environment (stresses and strains) associated with orthodontic tooth movement is a unique model in bone adaptation physiology. Numerous finite element models of varying complexity have been developed to calculate tooth movements and stress distributions within the alveolar bone and the periodontal ligament (PDL), In general, the PDL has been idealized as a homogeneous isotropic material. For this project, a 3-dimensional tooth/PDL/mandible/finite element model was developed in which, for the first time in such an analysis, the PDL's principal-fiber structure was also incorporated. Parametric analyses showed that the fiber orientation and the mechanical properties do not exert much influence on the locations of the CRes and the CRot and on the stress patterns within the bone and the PDL matrix. However, the absence of principal fibers produces not only different stress magnitudes, but also differences in stress patterns. Furthermore, the no-fiber-associated CRes and CRot are considerably separated from the cluster of fiber-influenced centers. It was concluded that it may be more realistic to incorporate "generic" principal fibers into finite element models than not to include them at all, despite the lack of reliable information about fibers.