细丝弓技术舌侧内收上颌前牙的三维有限元生物力学分析

发布时间：2018-01-22 17:47

本文关键词： 细丝弓技术舌侧矫治力系三维有限元模型生物力学　出处：《华西口腔医学杂志》2015年03期 　论文类型：期刊论文

【摘要】：目的建立细丝弓舌侧内收上颌前牙的三维有限元模型,研究不同后倾曲力矩对上颌前牙牙周膜静水压以及初始位移的影响。方法采用CT扫描法建立包含全牙列头颅的三维几何模型,用Solidworks软件生成舌侧托槽和弓丝的三维几何模型,组装并生成细丝弓舌侧内收上颌前牙的三维有限元模型。在三维有限元计算软件ANSYS中计算当颌间牵引力为0.556 N,后倾曲力矩分别为15、30、45、60、75 Nmm时上颌前牙的初始位移以及牙周膜静水压。结果上颌中切牙、侧切牙以及尖牙的唇舌侧根尖和颈缘共产生4个应力集中区,并产生远中方向的旋转初始位移和相对压入移动;上颌尖牙牙周膜的静水压应力和初始位移均显著大于中切牙和侧切牙;随着后倾曲力矩的增加,上颌中切牙、侧切牙和尖牙垂直向的初始压入位移和牙周膜静水压应力均逐渐增加。结论采用细丝弓技术舌侧内收上颌前牙的力系是安全可控的,通过改变弓丝后倾曲力矩的值可以有效控制牙齿移动的方式和移动量。
[Abstract]:Objective to establish a three-dimensional finite element model for the lingual adduction of maxillary anterior teeth. To study the effect of different backward bending moment on the hydrostatic pressure and initial displacement of the periodontal membrane of maxillary anterior teeth, a three-dimensional geometric model containing the whole dentition head was established by CT scanning. The 3D geometry model of tongue bracket and arch wire was generated by Solidworks software. The 3D finite element model of the maxillary anterior teeth was assembled and generated. In ANSYS, the intermaxillary traction was 0.556 Nand the backward bending moment was 15. The initial displacement of maxillary anterior teeth and the hydrostatic pressure of periodontal membrane were observed at 6075 Nmm. Results there were four stress concentration areas in maxillary central incisor, lateral incisor and labial and lingual tip and cervical margin of maxillary central incisor, lateral incisor and canine. And the initial displacement of rotation and the relative pressure movement of the far side direction are produced. The hydrostatic stress and initial displacement of maxillary canine periodontal membrane were significantly higher than those of central incisor and lateral incisor. The maxillary central incisor increases with the increase of backward bending moment. The initial indentation displacement and the hydrostatic stress of periodontal membrane increased gradually in both lateral incisor and canine teeth. Conclusion the force system of maxillary anterior teeth adducted on the lingual side by using the thin wire arch technique is safe and controllable. The tooth movement and movement can be effectively controlled by changing the bending moment of the arch wire.
【作者单位】：重庆医科大学附属口腔医院正畸科口腔疾病与生物医学重庆市重点实验室;
【基金】：重庆市卫生局一般项目基金资助项目(2013-2-069,2012-2-131)
【分类号】：R783.5
【正文快照】： 随着人们对于正畸矫治过程美观要求的提高,舌侧矫治日益成为成人矫治的重要选择。在舌侧矫治过程中,由于舌侧面的牙弓长度显著小于唇侧长度,因此相同大小的外力作用于舌侧矫治系统所产生的牙齿应力应变显著大于唇侧矫治系统[1-3]。在唇侧固定矫治技术中,以Tip-Edge为代表的细

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