上颌尖牙远中移动的矫治力分析

The analysis of orthodontic force for distal movementof maxillary canine

利用有限元法结合（Ｃｏｍｐｕｔｅｒａｉｄｅｄｄｅｓｉｇｎ，ＣＡＤ）技术，建立了上颌右侧尖牙及其周围组织的三维数学模型，模拟了正畸治疗过程中施加不同的矫治力，对牙齿和牙周组织所产生的初始应力及牙齿移动方式进行了分析。结果表明，同时施加力偶Ｍ和力Ｐ为最佳，且当Ｍ／Ｐ＝１０～１３ｍｍ时，既可使牙体产生较快的整体移动，又不致使牙周组织产生病理性损伤。本结果为指导临床治疗提供了理论与实验依据。

AbstractIn this study, the finite element method combiningwith CAD technique was used to establish the three-di-mensional mathematical model of the right maxillary ca-nine and its periodontical tissue. We imitated the differ-ent kinds of force which were used during the orthodon-tic treatment, and analyzed the ways of the teeth mov-ing and the initial stress on the teeth and periodontal tis-sue. Results showed that it was best to exert couple Mand force P simultaneously, especially when M /P= 10～ 13 mm, the teeth could be moved fast and wholelywithout pathological destruction on the periodontical tis-sue. The results of this study provide some theoreticaland experimental basis for clinical practice.