本文選題：PASS　切入點：三維有限元　出處：《新疆醫(yī)科大學》2017年碩士論文　論文類型：學位論文

【摘要】：目的:建立上頜牙列生理性支抗控制矯治器三維有限元模型并進行數(shù)值分析。方法:選取一名個別正常合志愿者,將CT掃描數(shù)據(jù)輸入Mimicsl7.0軟件,通過三維重建的方法獲得牙齒及頜骨(含皮質骨和松質骨)的三維模型。以stl格式轉入逆向工程軟件Geomagic Studio,對模型進行精修和細化。矯治器三維模型是在NX軟件中設計得到。弓絲定義為幾何非線性,將得到的牙齒、頜骨、矯治器,弓絲和輔弓模型以stp格式輸入NX軟件進行裝配,以ANSYSl5.0軟件進行網(wǎng)格劃分,最終建立牙齒、皮質骨、松質骨、弓絲、托槽的三維有限元模型分析弓絲入槽時各牙位的受力情況。并通過建立包含壓低輔弓的PASS矯治器三維有限元模型,研究壓低輔弓在PASS矯治技術中對前牙的壓低作用以及對磨牙增強支抗的作用。設置三種工況,分析主輔弓結扎位點分別置于中切牙近中、側切牙近中、側切牙遠中時牙列的整體受力情況及前牙的運動趨勢。結果:建立了包括牙齒、頜骨、生理性支抗矯治器、弓絲、的三維有限元的整體模型。弓絲入槽后第一磨牙及尖牙均產(chǎn)生了冠遠中,根近中的旋轉移動趨勢。主輔弓結扎位點在中切牙間時,前牙壓低效果明顯;側切牙近中結扎時前牙唇傾效果明顯;側切牙遠中結扎時,前牙出現(xiàn)舌傾伴壓低的趨勢。三種工況下磨牙后傾的位移趨勢均較大。結論:建立了生理性支抗控制矯治器有限元模型。可以模擬臨床牙齒受力情況和位移趨勢,有利于臨床對該項技術的理解和應用。
[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.
【學位授予單位】：新疆醫(yī)科大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：R783.5

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