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目的:利用螺旋CT技术与三维有限元方法建立上颌埋伏尖牙及其支持组织的三维有限元模型,模拟上颌埋伏尖牙正畸牵引的动态过程,从而为正畸临床牵引治疗埋伏牙提供基础实验依据。方法:选取一例上颌尖牙完全骨埋伏患者,利用螺旋CT设备,Mimics、UnigraPhic(UG)、MSC.Mentat等软件,建立埋伏牙及其支持组织的三维有限元模型,在建立的三维有限元模型上模拟牵引上颌埋伏尖牙移动的动态过程,画出埋伏牙牵引过程的时间-位移图。结果:①建立的上颌埋伏尖牙及牙周组织三维有限元模型具有良好几何相似性;②一个治疗周期内(28d),第一阶段(0～7d)埋伏牙移动0.589mm,第二阶段(8～21d)埋伏牙移动0.713mm,第三阶段(22～28d)埋伏牙移动0.276mm。结论:①利用螺旋CT扫描技术、Mimics、UG、MSC等工程软件建立的上颌埋伏尖牙三维有限元模型精确度较高,可以满足对埋伏牙进行模拟牵引加载的需求。②所得出的一个治疗周期内(28d)埋伏牙移动的时间-位移曲线图基本能反映埋伏牙的位移趋势。
OBJECTIVE: To establish a three-dimensional finite element model of the maxillary impacted canine and its supporting tissues by using spiral CT and three-dimensional finite element method to simulate the dynamic process of maxillary impacted canine orthodontic traction so as to provide the basic experiment for orthodontic traction treatment of impacted teeth in accordance with. Methods: A patient with maxillary canine anterior maxillary ambulation was selected. The three-dimensional finite element model of the impacted tooth and its supporting tissue was established by using spiral CT equipment, Mimics, UnigraPhic (UG), MSC.Mentat and other software. On the simulation of traction dynamic process of maxillary ambush canine, draw the time-displacement diagram of the ambush traction process. Results: (1) The established 3D finite element model of the maxillary impacted canine and periodontal tissue has good geometric similarity. In one treatment cycle (28d), the ambulatory tooth movement in the first stage (0 ~ 7d) is 0.589mm. In the second stage 8 ~ 21d) ambush tooth movement 0.713mm, the third phase (22 ~ 28d) ambush tooth movement 0.276mm. Conclusion: ①Three-dimensional finite element models of maxillary impacted canines established by using the software of Mimics, UG, MSC and so on are highly accurate, which can meet the demand of simulated traction loading of the impacted teeth. ② obtained during a treatment cycle (28d) ambush tooth movement time - displacement curve can basically reflect the trend of displacement of the ambush.