A numerical simulation of tooth movement by wire bending
A numerical simulation of tooth movement by wire bending
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DOI：
10.1016/j.ajodo.2005.01.028
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发表时间：
2006-10-01
影响因子：
3
通讯作者：
Fukui, Hisao
中科院分区：
文献类型：
--
作者：
Kojima, Yukio;Fukui, Hisao
简介：在正畸治疗中，金属丝被弯曲并附着在牙齿上，通过弹性恢复来移动牙齿。为了预测牙齿将如何移动，计算由金属丝产生的初始力系。然而，初始力系统随着牙齿移动而改变，并且可能不用于预测最终牙齿位置。本研究的目的是开发一个全面的力学，三维，预测牙齿移动的数值模型。方法：对金属丝弯曲产生的牙齿移动进行数值模拟。牙齿移动是骨重建的结果，骨重建与牙周膜中的应力成比例。结果：偏心弯曲时，靠近弯曲位置的一颗牙受到的力矩较大，倾斜程度较其他牙明显。此外，远离弯曲位置的牙齿在近中或远中方向上略微移动。当第二磨牙作为锚牙添加时，中心V形弯曲增加了倾斜角和犬齿的侵入，并防止了第一磨牙的移动。当在下颌牙弓中放置一根具有倒Spee曲线的金属丝时，计算的牙齿垂直移动趋势与测量结果相同。在这些牙齿移动中，初始力系随着牙齿移动而改变。牙齿移动受牙根表面积大小的影响。结论：可以估计由金属丝弯曲产生的牙齿移动。很难从初始力系预测最终牙齿位置。
Introduction: In orthodontic treatment, wires are bent and attached to teeth to move them via elastic recovery. To predict how a tooth will move, the initial force system produced from the wire is calculated. However, the initial force system changes as the tooth moves and may not be used to predict the final tooth position. The purpose of this study was to develop a comprehensive mechanical, 3-dimensional, numerical model for predicting tooth movement. Methods: Tooth movements produced by wire bending were simulated numerically. The teeth moved as a result of bone remodeling, which occurs in proportion to stress in the periodontal ligament. Results: With an off-center bend, a tooth near the bending position was subjected to a large moment and tipped more noticeably than the other teeth. Also, a tooth far from the bending position moved slightly in the mesial or the distal direction. With the center V-bend, when the second molar was added as an anchor tooth, the tipping angle and the intrusion of the canine increased, and movement of the first molar was prevented. When a wire with an inverse curve of Spee was placed in the mandibular arch, the calculated tendency of vertical tooth movements was the same as the measured result. In these tooth movements, the initial force system changed as the teeth moved. Tooth movement was influenced by the size of the root surface area. Conclusions: Tooth movements produced by wire bending could be estimated. It was difficult to predict final tooth positions from the initial force system.