本文關(guān)鍵詞： 個性化舌側(cè)矯治 微種植體 三維有限元 生物力學(xué) 磨牙前移　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：目的建立包括個性化舌側(cè)托槽、不銹鋼弓絲、下牙列、牙周膜及牙槽骨在內(nèi),左側(cè)第一磨牙缺失的下頜三維有限元模型,研究個性化舌側(cè)矯治微種植體支抗近中移動下頜第二磨牙,牙齒移動規(guī)律及牙周膜應(yīng)力分布特征,為臨床應(yīng)用提供參考。方法本研究設(shè)計為三個實驗:實驗一為三維有限元整體模型的建立,方法如下:256排螺旋CT掃描獲取志愿者的下頜影像,通過Mimics、Pro/E、Geomagic Studio軟件轉(zhuǎn)化為下頜骨三維模型;建立3個不同槽溝長度(3.5mm、4.0mm、4.5mm)的左側(cè)下頜第二磨牙個性化舌側(cè)托槽;在ANSYS內(nèi)將下頜骨與托槽模型組裝成3個個性化舌側(cè)托槽-不銹鋼弓絲-下牙列-牙周膜-下頜骨的實體模型,最后對實體模型進(jìn)行網(wǎng)格劃分、材料力學(xué)參數(shù)設(shè)定、邊界約束得到三維有限元模型。實驗二:研究不同牽引力個性化舌側(cè)矯治微種植體支抗近中移動下頜第二磨牙牙齒位移與牙周膜應(yīng)力的變化規(guī)律。在槽溝長度為4.0mm的三維有限元模型上,設(shè)置四種工況。工況一為單純舌側(cè)加載1.5N(150g)拉力,工況二、三、四為分別在唇舌側(cè)同時加載0.5N(50g)、0.75N(75g)、1.0N(100g)拉力,讀取牙列三維方向的初始位移以及牙周膜von Mises應(yīng)力、最大主應(yīng)力及最小主應(yīng)力分布情況并進(jìn)行分析總結(jié)。實驗三:研究不同槽溝長度個性化舌側(cè)矯治微種植體支抗近中移動下頜第二磨牙牙齒位移與牙周膜應(yīng)力的變化規(guī)律。分別對實驗一建立的三個有限元模型唇舌側(cè)同時加載拉力為0.75N,設(shè)置3種工況,讀取與分析的指標(biāo)與實驗二相同。結(jié)果實驗一成功建立3個第二磨牙槽溝長度不同,包括個性化舌側(cè)托槽、不銹鋼弓絲、下牙列、牙周膜、下頜骨在內(nèi)的左側(cè)第一磨牙缺失的下頜三維有限元模型。實驗二研究發(fā)現(xiàn)唇舌側(cè)同時加力比單純舌側(cè)加力下頜第二磨牙牙周膜應(yīng)力分布更加均勻,減小了遠(yuǎn)中舌向扭轉(zhuǎn)的趨勢,增加了近中傾斜的趨勢。隨著拉力不斷增加,近中傾斜趨勢、牙齒的初始位移、牙周膜應(yīng)力均增加,雙側(cè)分別加載1.0N的拉力牙周膜的von Mises應(yīng)力最大值達(dá)到5.72×10-2Mpa,超過安全范圍。實驗三研究發(fā)現(xiàn)槽溝長度從3.5mm延長到4.5mm時,牙齒仍為傾斜移動,但牙周膜應(yīng)力分布更加均勻。槽溝長度每延長0.5mm,牙冠與牙根的初始位移差減小5%。結(jié)論1.個性化舌側(cè)矯治微種植體支抗近中移動下頜第二磨牙的三維有限元模型系首次構(gòu)建,具有較強(qiáng)的臨床相似性與生物仿真性,可以為進(jìn)一步研究提供平臺。2.在該模型下,最適宜前移下頜第二磨牙的加力方式為唇舌側(cè)同時加載0.75N的力量。3.通過延長個性化舌側(cè)托槽槽溝的長度可以降低牙齒前移時近中傾斜的趨勢但效果十分有限,臨床應(yīng)用時還需配合其他正軸方法。
[Abstract]:Objective to establish a three-dimensional finite element model of the left first molar, including individual lingual bracket, stainless steel arch wire, lower dentition, periodontal ligament and alveolar bone. To study the characteristics of tooth movement and periodontal ligament stress distribution in the treatment of mandibular second molars with individualized lingual microimplant Anchorage. Methods this study was designed as three experiments: one was the establishment of a three-dimensional finite element model, and the methods were as follows: 256-slice spiral CT scan to obtain mandibular images of volunteers. Three dimensional mandibular models were transformed into three dimensional mandibular models by using the software of Mimicsl Prop / Geomagic Studio, and three individualized lingual brackets of left mandibular second molars with different grooves (3.5 mm or 4.0 mm to 4.5 mm) were established. In ANSYS, the mandibular and bracket models were assembled into three individual solid models of tongue side bracket, stainless steel arch wire, lower dentition, periodontal ligament and mandible. Finally, the solid model was meshed and the mechanical parameters of materials were set. Three dimensional finite element model was obtained by boundary constraint. Experiment 2: study the change of tooth displacement and periodontal membrane stress of mandibular second molars with different traction individualized tongue side orthodontic implants. The length of grooves is as follows:. On the 4.0mm 3D finite element model, Four kinds of working conditions were set up. The first condition was simple tongue side loading 1.5 Nu 150g) tension, and the second, third, and fourth conditions were 0.5 Nu 50Nm 0.75NL 75g ~ (75) N ~ (-1) N ~ (10) N ~ (100 g)) at the same time. The initial displacement of the three-dimensional direction of dentition and the von Mises stress of periodontal ligament were read. The distribution of maximum principal stress and minimum principal stress were analyzed and summarized. Experiment 3: study on the displacement and periodontal ligament stress of mandibular second molar treated with micro-implant support with different grooves. For the three finite element models established in experiment 1, the tension on the lip and tongue side is 0.75 N at the same time, and three kinds of working conditions are set up. Results in experiment 1, the length of the grooves of the three second molars were different, including the individualized lingual brackets, stainless steel arch wire, lower dentition, periodontal ligament, and so on. Three dimensional finite element model of the left first molar missing from the mandible. Experiment 2 found that the stress distribution of the periodontal membrane of the mandibular second molar was more uniform than that of the simple lingual side, which reduced the trend of the torsion of the distal tongue. With the increasing of tension and inclination, the initial displacement of teeth and the stress of periodontal membrane are all increased. The maximum von Mises stress of the tension periodontal membrane loaded with 1.0 N on both sides was 5.72 脳 10 ~ (-2) MPA, which exceeded the safe range. Experiment 3 showed that when the groove length was extended from 3.5 mm to 4.5 mm, the tooth was still tilted. However, the stress distribution of periodontal ligament is more uniform. The initial displacement difference between crown and root decreases by 5. 1. The three dimensional finite element model of individualized lingual microimplant Anchorage against proximal mandibular second molar is constructed for the first time. Has strong clinical similarity and biological simulation, can provide a platform for further research. 2. Under this model, The most suitable way to push forward mandibular second molars is to load 0.75N at the same time on the lip and tongue side. 3. By extending the length of the grooves of the individualized lingual side, we can reduce the tendency of the proximal and middle tilt of the teeth when the teeth move forward, but the effect is very limited. Other positive axis methods should also be used in clinical application.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：R783.5

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