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目的:探索构建牙周膜超弹性本构模型的方法,模拟直丝弓矫治技术滑动机制条件下一步法和两步法内收上颌前牙,并观察上颌前牙的初始位移趋势。方法:建立种植体支抗的位置位于第二前磨牙与第一磨牙之间及高度分别距牙槽嵴顶上4 mm、6 mm、8 mm不同组合的三维模型,并观察模拟滑动法内收前牙时,上颌前牙的初始位移情况。结果:内收上颌前牙,高度增加时,各前牙牙冠初始内收量减小,各前牙的初始压入量增大,牙周膜受力较分散且最大应力值向根尖部位转移;两步法内收前牙较一步法内收前牙,中切牙、侧切牙初始内收量更大,初始压入量更大。结论:种植体高度的变化主要影响牙齿的垂直向位移方式;一步法与两步法内收上颌前牙时,两步法可以获得更大的牙齿初始位移量。
OBJECTIVE: To explore a method of constructing a hypersurfactory model of periodontal ligament, and to simulate the one-step and two-step approach of maxillary anterior teeth under the sliding mechanism of straight-wire appliance and to observe the initial displacement tendency of maxillary anterior teeth. Methods: The three-dimensional model with different combinations of 4 mm, 6 mm and 8 mm height between the second premolar and the first molars and the height of the alveolar crest was established to observe the effect of the simulated slip method Anterior teeth, the initial displacement of the maxillary anterior teeth. Results: When the height of the maxillary anterior teeth was increased, the initial adduction amount of the crowns of each anterior teeth decreased, the initial implants of the anterior teeth increased, the stress of the periodontal ligament was more dispersed and the maximum stress value shifted to the apical part ; The two-step method of anterior adduction adduction of anterior adduction, incisors, lateral incisors initial admission greater, the initial amount of compression greater. Conclusion: The change of implant height mainly affects the vertical displacement of teeth. When one-step and two-step method are used to close maxillary anterior teeth, the two-step method can obtain larger initial displacement of teeth.