包含微型種植體和直絲弓矯治器的下頜三維有限元模型的建立及分析
發(fā)布時間：2018-11-07 08:03
【摘要】：目的建立下頜骨、下牙列、托槽、弓絲及微種植體三維有限元模型，為口腔正畸生物力學(xué)研究提供數(shù)字模型基礎(chǔ)。通過微植體不同植入位置、角度和遠(yuǎn)中拔牙窩組織的變化，分析周圍組織的應(yīng)力和牙齒移動的阻力，以期為臨床工作提供生物力學(xué)依據(jù)。 方法1.對1名志愿者頭顱部進(jìn)行螺旋CT掃描，利用MIMICS軟件進(jìn)行微型種植體、直絲弓托槽及三維實體模型的重建，在Geomagic中優(yōu)化后導(dǎo)入ANSYS軟件中賦值及網(wǎng)格劃分，建立牙列-牙周膜-MBT直絲弓矯治器-微型種植體-下頜骨的三維有限元模型，并進(jìn)行計算機(jī)模擬下的實驗驗證。2.建立5個包括微型種植體和下頜第一、二前磨牙的模型，在頰側(cè)牙槽骨植入微植體并負(fù)載150g力值，分析微植體不同植入位置和角度時周圍牙齒牙周膜的應(yīng)力分布變化，探討改變微植體的位置和角度對周圍牙齒應(yīng)力分布的影響，以了解微植體加載時是否會對周圍牙齒產(chǎn)生過大的應(yīng)力。3.將有限元模型的第二磨牙遠(yuǎn)中設(shè)置為第三磨牙拔牙窩，拔牙窩分別為肉芽組織、結(jié)締組織、不成熟骨、成熟骨，模擬拔牙創(chuàng)不同愈合期利用微植體支抗整體遠(yuǎn)移下頜牙列。 結(jié)果1.建立了包含微型種植體、排齊整平的下頜牙列、牙周膜、牙槽骨及直絲弓托槽的下頜三維有限元模型，計算機(jī)實驗?zāi)M牙齒的位移狀況與臨床基本一致。 2.當(dāng)微植體植入兩顆前磨牙的中間牙槽骨時，第二前磨牙壓力為0.093MPa。當(dāng)微植體向第二前磨牙移動時，第二前磨牙牙周膜應(yīng)力增加，，同時第一前磨牙牙周膜應(yīng)力減小。當(dāng)微植體向第一前磨牙傾斜時，第二前磨牙牙周膜應(yīng)力下降，第一前磨牙牙周膜應(yīng)力增加。3.工況一至四，中切牙至第一磨牙牙周膜Von-Mises應(yīng)力值逐漸增大，第二磨牙牙周膜Von-Mises應(yīng)力值逐漸減小。同時中切牙至第二磨牙最大初始位移值不斷增大。 結(jié)論1.高效、精確地建立了三維有限元模型，可為模擬不同正畸狀態(tài)下的牙齒及周圍牙槽骨的應(yīng)力分析，較好的模型支持。2.當(dāng)微植體受力時，周圍組織會產(chǎn)生應(yīng)力。改變微植體位置和角度能影響到鄰近牙齒的牙周膜應(yīng)力變化。3.拔牙創(chuàng)愈合早期移動牙齒，有利于下頜牙列遠(yuǎn)移。
[Abstract]:Objective to establish a three-dimensional finite element model of mandible, lower dentition, bracket, arch wire and microimplant to provide a digital model for orthodontic biomechanics. In order to provide biomechanical basis for clinical work, the stress of the surrounding tissues and the resistance of tooth movement were analyzed through the changes of the tissue of the microimplant in different positions, angles and distally extracted teeth in order to provide a biomechanical basis for clinical work. Method 1. Spiral CT scanning was performed on the skull of a volunteer. The micro implants, straight wire arch brackets and 3D solid models were reconstructed by MIMICS software. After optimized in Geomagic, the values were assigned and meshed in ANSYS software. Three-dimensional finite element model of dentition periodontal ligament MBT straight wire appliance microimplant and mandible was established and verified by computer simulation. 2. Five models including microimplants and first and second premolars of the mandible were established. The stress distribution of periodontal ligament around the microimplant was analyzed when the implant was implanted in the buccal alveolar bone and loaded with 150 g force. The effect of changing the position and angle of the microimplant on the stress distribution of the surrounding teeth was discussed in order to find out whether the stress on the surrounding teeth would be too large when the microimplant was loaded. 3. The second molars of the finite element model were located in the extraction fossa of the third molar, which were granulation tissue, connective tissue and immature bone respectively. The microimplant Anchorage was used to resist the whole distal mandibular dentition in different healing stages. Result 1. A three dimensional finite element model of mandible, periodontal ligament, alveolar bone and straight wire arch bracket was established. The displacement of teeth simulated by computer experiment was basically consistent with that of clinic. 2. The pressure of the second premolar was 0.093 MPA when the microimplant was implanted into the middle alveolar bone of the two premolars. When the microimplant moved to the second premolar, the periodontal stress of the second premolar increased and the first premolar periodontal stress decreased. When the microimplant tilted to the first premolar, the periodontal membrane stress of the second premolar decreased, and the first premolar periodontal ligament stress increased by 3. 3%. The Von-Mises stress of periodontal membrane from the central incisor to the first molar increases gradually, while the Von-Mises stress of the second molar decreases gradually. At the same time, the maximum initial displacement between the central incisor and the second molar is increasing. Conclusion 1. The three-dimensional finite element model is established efficiently and accurately, which can be used to simulate the stress analysis of teeth and the surrounding alveolar bone in different orthodontic states. When the microimplant is subjected to force, the surrounding tissue produces stress. Changing the position and angle of the microimplant can affect the stress change of periodontal ligament in the adjacent teeth. Removal of teeth at the early stage of wound healing is beneficial to the distal displacement of the mandibular dentition.
【學(xué)位授予單位】：安徽醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R783.6
[Abstract]:Objective to establish a three-dimensional finite element model of mandible, lower dentition, bracket, arch wire and microimplant to provide a digital model for orthodontic biomechanics. In order to provide biomechanical basis for clinical work, the stress of the surrounding tissues and the resistance of tooth movement were analyzed through the changes of the tissue of the microimplant in different positions, angles and distally extracted teeth in order to provide a biomechanical basis for clinical work. Method 1. Spiral CT scanning was performed on the skull of a volunteer. The micro implants, straight wire arch brackets and 3D solid models were reconstructed by MIMICS software. After optimized in Geomagic, the values were assigned and meshed in ANSYS software. Three-dimensional finite element model of dentition periodontal ligament MBT straight wire appliance microimplant and mandible was established and verified by computer simulation. 2. Five models including microimplants and first and second premolars of the mandible were established. The stress distribution of periodontal ligament around the microimplant was analyzed when the implant was implanted in the buccal alveolar bone and loaded with 150 g force. The effect of changing the position and angle of the microimplant on the stress distribution of the surrounding teeth was discussed in order to find out whether the stress on the surrounding teeth would be too large when the microimplant was loaded. 3. The second molars of the finite element model were located in the extraction fossa of the third molar, which were granulation tissue, connective tissue and immature bone respectively. The microimplant Anchorage was used to resist the whole distal mandibular dentition in different healing stages. Result 1. A three dimensional finite element model of mandible, periodontal ligament, alveolar bone and straight wire arch bracket was established. The displacement of teeth simulated by computer experiment was basically consistent with that of clinic. 2. The pressure of the second premolar was 0.093 MPA when the microimplant was implanted into the middle alveolar bone of the two premolars. When the microimplant moved to the second premolar, the periodontal stress of the second premolar increased and the first premolar periodontal stress decreased. When the microimplant tilted to the first premolar, the periodontal membrane stress of the second premolar decreased, and the first premolar periodontal ligament stress increased by 3. 3%. The Von-Mises stress of periodontal membrane from the central incisor to the first molar increases gradually, while the Von-Mises stress of the second molar decreases gradually. At the same time, the maximum initial displacement between the central incisor and the second molar is increasing. Conclusion 1. The three-dimensional finite element model is established efficiently and accurately, which can be used to simulate the stress analysis of teeth and the surrounding alveolar bone in different orthodontic states. When the microimplant is subjected to force, the surrounding tissue produces stress. Changing the position and angle of the microimplant can affect the stress change of periodontal ligament in the adjacent teeth. Removal of teeth at the early stage of wound healing is beneficial to the distal displacement of the mandibular dentition.
【學(xué)位授予單位】：安徽醫(yī)科大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R783.6
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