包含微型种植体和直丝弓矫治器的下颌三维有限元模型的建立及分析
发布时间：2018-11-07 08:03
【摘要】：目的建立下颌骨、下牙列、托槽、弓丝及微种植体三维有限元模型，为口腔正畸生物力学研究提供数字模型基础。通过微植体不同植入位置、角度和远中拔牙窝组织的变化，分析周围组织的应力和牙齿移动的阻力，以期为临床工作提供生物力学依据。 方法1.对1名志愿者头颅部进行螺旋CT扫描，利用MIMICS软件进行微型种植体、直丝弓托槽及三维实体模型的重建，在Geomagic中优化后导入ANSYS软件中赋值及网格划分，建立牙列-牙周膜-MBT直丝弓矫治器-微型种植体-下颌骨的三维有限元模型，并进行计算机模拟下的实验验证。2.建立5个包括微型种植体和下颌第一、二前磨牙的模型，在颊侧牙槽骨植入微植体并负载150g力值，分析微植体不同植入位置和角度时周围牙齿牙周膜的应力分布变化，探讨改变微植体的位置和角度对周围牙齿应力分布的影响，以了解微植体加载时是否会对周围牙齿产生过大的应力。3.将有限元模型的第二磨牙远中设置为第三磨牙拔牙窝，拔牙窝分别为肉芽组织、结缔组织、不成熟骨、成熟骨，模拟拔牙创不同愈合期利用微植体支抗整体远移下颌牙列。 结果1.建立了包含微型种植体、排齐整平的下颌牙列、牙周膜、牙槽骨及直丝弓托槽的下颌三维有限元模型，计算机实验模拟牙齿的位移状况与临床基本一致。 2.当微植体植入两颗前磨牙的中间牙槽骨时，第二前磨牙压力为0.093MPa。当微植体向第二前磨牙移动时，第二前磨牙牙周膜应力增加，，同时第一前磨牙牙周膜应力减小。当微植体向第一前磨牙倾斜时，第二前磨牙牙周膜应力下降，第一前磨牙牙周膜应力增加。3.工况一至四，中切牙至第一磨牙牙周膜Von-Mises应力值逐渐增大，第二磨牙牙周膜Von-Mises应力值逐渐减小。同时中切牙至第二磨牙最大初始位移值不断增大。 结论1.高效、精确地建立了三维有限元模型，可为模拟不同正畸状态下的牙齿及周围牙槽骨的应力分析，较好的模型支持。2.当微植体受力时，周围组织会产生应力。改变微植体位置和角度能影响到邻近牙齿的牙周膜应力变化。3.拔牙创愈合早期移动牙齿，有利于下颌牙列远移。
[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.
【学位授予单位】：安徽医科大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：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.
【学位授予单位】：安徽医科大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：R783.6
【参考文献】
相关期刊论文 前10条
1 米方林;周燕玲;黄志澎;张杨;;支抗力作用下上颌第一磨牙牙周膜应力的三维有限元分析[J];国际口腔医学杂志;2008年01期
2 袁晓,罗颂椒,沈刚,陈振琦,朱庆党;邻牙向拔牙区移动最佳时机选择的实验研究[J];华西口腔医学杂志;2003年04期
3 王颖;熊国平;汪麟;;拔牙创愈合对正畸牙移动的影响[J];华西口腔医学杂志;2006年03期
4 王海燕,邵s
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