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目的比较隐形矫治中下颌尖牙在不同移动方式下的机械响应。方法根据牙齿及其支持组织的计算机断层扫描图像,建立下颌前牙及牙周组织有限元模型,模拟尖牙在颊舌方向上的平移、倾斜、旋转,以获得这3种不同移动方式下尖牙及其牙周膜的位移和应力。结果尖牙的初始运动和牙周膜的应力分布主要由尖牙的运动类型决定。在平移和倾斜移动中,牙周膜的应力分布和尖牙移动趋势相似。尖牙旋转的整体移动趋势在相同的位移幅度下远远大于平移移动的整体运动趋势。结论下颌尖牙对不同移动方式的机械响应方式及程度是不同的。熟悉牙齿的这些响应的差异有助于利用不同运动方式牙齿的机械响应特点,设计更加合理的隐形矫治方案,避免损伤牙周组织,并且以最短的时间完成牙齿矫正。
Objective To compare the mechanical response of mandibular canine in different modes of movement in stealthy treatment. Methods The finite element model of the mandible anterior teeth and periodontal tissues was established based on the computed tomography images of the teeth and their supporting tissues. The finite element model of the mandibular anterior teeth and periodontal tissues was established to simulate the translation, tilting and rotation of the canines in the buccal and lingual direction so as to obtain the tips of these 3 different moving modes Displacement and stress of teeth and their periodontal ligament. Results The initial canine movement and periodontal ligament stress distribution are mainly determined by the type of canine movement. In translation and tilt movements, the stress distribution in the periodontal ligament resembles the canine movement. The overall trend of canine rotation is far greater than the overall trend of translational movement at the same range of displacement. Conclusion The mandibular canines respond differently to different modes of motion. Familiar with the differences in these responses of the teeth help to make use of the mechanical response characteristics of different movement modes of teeth to design a more reasonable invisible correction program to avoid damaging the periodontal tissues and to complete orthodontics in the shortest time.