上颌牙列生理性支抗控制矫治器三维有限元模型的建立及受力分析

发布时间：2018-03-05 23:27

本文选题：PASS　切入点：三维有限元　出处：《新疆医科大学》2017年硕士论文　论文类型：学位论文

【摘要】：目的:建立上颌牙列生理性支抗控制矫治器三维有限元模型并进行数值分析。方法:选取一名个别正常合志愿者,将CT扫描数据输入Mimicsl7.0软件,通过三维重建的方法获得牙齿及颌骨(含皮质骨和松质骨)的三维模型。以stl格式转入逆向工程软件Geomagic Studio,对模型进行精修和细化。矫治器三维模型是在NX软件中设计得到。弓丝定义为几何非线性,将得到的牙齿、颌骨、矫治器,弓丝和辅弓模型以stp格式输入NX软件进行装配,以ANSYSl5.0软件进行网格划分,最终建立牙齿、皮质骨、松质骨、弓丝、托槽的三维有限元模型分析弓丝入槽时各牙位的受力情况。并通过建立包含压低辅弓的PASS矫治器三维有限元模型,研究压低辅弓在PASS矫治技术中对前牙的压低作用以及对磨牙增强支抗的作用。设置三种工况,分析主辅弓结扎位点分别置于中切牙近中、侧切牙近中、侧切牙远中时牙列的整体受力情况及前牙的运动趋势。结果:建立了包括牙齿、颌骨、生理性支抗矫治器、弓丝、的三维有限元的整体模型。弓丝入槽后第一磨牙及尖牙均产生了冠远中,根近中的旋转移动趋势。主辅弓结扎位点在中切牙间时,前牙压低效果明显;侧切牙近中结扎时前牙唇倾效果明显;侧切牙远中结扎时,前牙出现舌倾伴压低的趋势。三种工况下磨牙后倾的位移趋势均较大。结论:建立了生理性支抗控制矫治器有限元模型。可以模拟临床牙齿受力情况和位移趋势,有利于临床对该项技术的理解和应用。
[Abstract]:Objective: to establish a three-dimensional finite element model of maxillary dentition physiological Anchorage controlled orthodontics and analyze it numerically. Methods: one individual normal volunteer was selected and the CT scan data were input into Mimicsl7.0 software. The 3D model of teeth and jaw (including cortical bone and cancellous bone) was obtained by 3D reconstruction. The model was refined and refined in stl format by the reverse engineering software Geomagic Studio. The three dimensional model of orthodontic appliance was used in NX software. The arch wire is defined as geometric nonlinearity, The tooth, jaw, appliance, arch wire and auxiliary arch model were imported into NX software in stp format to assemble, and ANSYSl5.0 software was used to mesh the teeth, cortical bone, cancellous bone, arch wire. The three dimensional finite element model of bracket is used to analyze the stress of tooth position when the arch wire enters the groove, and the three-dimensional finite element model of the PASS appliance which contains the auxiliary bow is established. To study the effect of depress auxiliary arch on anterior teeth and enhance Anchorage of molars in PASS orthodontic technique. Three kinds of working conditions were set to analyze the location of ligation of main and auxiliary arch in central incisor and lateral incisor, respectively, in three working conditions, the main and auxiliary arch ligation sites were placed in central incisor and lateral incisor respectively. Results: the lateral incisors, including teeth, jaws, physiological Anchorage appliance, arch wire, were established. The first molars and canines of the first molar and the canine after the arch wire entered into the alveolus produced a trend of rotation and movement in the distal and proximal roots of the first molar and the canine teeth. When the main and auxiliary arch ligation sites were between the central incisors, the anterior teeth were depressed significantly. When the lateral incisor was proximally ligated, the labial inclination of the anterior incisor was obvious, and when the lateral incisor was distal ligated, There is a tendency of tongue inclination with depression in anterior teeth. The displacement trend of posterior inclination of molars is larger under three working conditions. Conclusion: a finite element model of physiological Anchorage controlled appliance is established, which can be used to simulate the stress and displacement trend of clinical teeth. It is beneficial to clinical understanding and application of this technique.
【学位授予单位】：新疆医科大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.5

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