MEAW技术治疗平面偏斜机制的有限元研究

The finite element analysis of occlusal plane deflection mechanism by use of multi-loop edgewise arch wire

目的:对应用多曲方丝弓技术纠正平面偏斜时的力学系统进行有限元分析,了解多曲方丝弓加力后牙齿及牙周支持组织的应力分布的情况。方法:建立多曲方丝弓、上颌牙列及牙周支持组织的有限元模型,然后进一步模拟临床加力方法,在两侧弓丝"L"曲水平部位分别加载方向相反的垂直方向的控制位移(0.5mm、1.0mm、1.5mm、2.0mm),然后进行非线性分析。结果:MEAW弓丝经调整加力后,在相应牙齿的托槽位置会产生UY方向的集中力,并且两侧的集中力方向相反;弓丝整体应力分布比较均匀,没有出现较大的应力集中现象。结论:①本研究建立的多曲方丝弓、上颌牙列及牙周支持组织的三维有限元模型,比较符合实际情况,可适用于多曲方丝弓矫治技术的研究;②应用多曲方丝弓技术纠正牙合平面偏斜时,弓丝整体无较大的应力集中点,同时牙周膜的应力分布也比较均匀,利于牙齿的整体移动。

Objective The purpose of this article is to study the force system that produced by multi-loop edgewise arch wire while correcting patients with facial asymmetry and canted occlusal plane.Methods First the finite element model of the multiloop edgewise arch wire（MEAW）,maxillary dentition and periodontal support organizations were constructed.Then the force was made on the maxillary dentition to simulate the clinical situation.Results The MEAW arch will produce the concentrated force of the direction of UY,and both sides of the concentrated force in the opposite direction.Stress distribution of the whole arch wire was more uniform and there was no large stress concentration.Conclusion ①This finite element model was feasible and effective.②The stress distribution of the whole arch wire and the periodontal ligament was more uniform and conducive to the overall mobile teeth.