【作者】 王俊杰；

【导师】 安晓莉；

【作者基本信息】 兰州大学 ， 口腔医学（专业学位）， 2021， 硕士

【摘要】 目的:研究在滑动法关闭拔牙间隙阶段,生理性支抗控制理念应用在舌侧矫治技术中对支抗磨牙的作用。方法:根据CBCT建立上颌右侧第一磨牙、牙周膜、牙槽骨的三维有限元模型,根据PASS矫治器及MBT矫治器数据,建立XBT颊面管及MBT颊面管的三维有限元模型,将模型分为轴倾度为0°的MBT组模型和轴倾度为-7°的PASS组模型,模拟滑动法关闭拔牙间隙阶段在颊侧、舌侧分别加载100g,150g,200g滑动内收力以及颊、舌侧同时加载50g,75g,100g滑动内收力,分析不同加力模式下上颌右侧第一磨牙的位移和牙周膜应力。结果:不同工况中支抗磨牙均出现了不同程度的旋转、倾斜、压低和伸长移动,随着力值增大,这些位移趋势也随之增大;颊、舌侧同时加力时,支抗磨牙的近中向位移小于其他两组;同种加力模式下,PASS组的近中向位移小于MBT组;单纯舌侧加力时牙周膜最大初始等效应力小于其他两组,PASS组在颊侧加力时牙周膜最大初始等效应力大于MBT组,但在舌侧及颊舌侧加力时小于MBT组。结论:生理性支抗控制理念应用于舌侧矫治中有更好的矢状向支抗控制和垂直向控制,支抗磨牙所受到的牙周膜最大初始等效应力也更小,但需要注意转矩和旋转的控制。更多还原

【Abstract】 Objective: To study the effect of the physiological anchorage control concept in lingual and buccal orthodontic techniques to anchorage molars during the sliding method extraction space closure stage.Methods: The three-dimensional finite element model of the right maxillary first molar、periodontal ligament and alveolar bone of the right maxillary was established according to CBCT.The three-dimensional finite element model of XBT buccal tube and MBT buccal tube was established according to the data of PASS appliance and MBT appliance.The finite element model was divided into the MBT group with the axial inclination of 0° and the PASS group with the axial inclination of-7°.The simulated 100 g,150g,and 200 g sliding retraction force was loaded on the buccal and lingual sides respectively.At the same time,50 g,75g,100 g sliding retraction force was loaded on the buccal and lingual sides simultaneously.The displacement and periodontal ligament stress of the anchorage molar under different conditions were derived.Results: In different conditions,the anchorage molars showed different degrees of rotation,tipping,intrusion,and extrusion.As the force increases,these displacement trends also increase.The mesial displacement of buccal and lingual sides respectively load force group is less than the other two groups.Under the same force load,the mesial displacement of the PASS group is less than the MBT group,the maximum stress of the periodontal ligament is smaller than the other two groups when the lingual force is loaded only.Compared to the MBT group,the maximum stress of the periodontal ligament of PASS group is higher when the force is loaded buccal side,but less when the force is loaded to the lingual and buccal-lingual sides.Conclusions: The concept of physiological anchorage control applied to lingual orthodontics has better sagittal anchorage control and vertical control.The maximum stress of the periodontal ligament on the anchored molars is also lower,but attention needs to be paid to torque and rotate.更多还原