MEAW弓丝应力分布的研究

Study of the stress distribution in MEAW archwire.

目的:采用有限元方法研究MEAW弓丝的力学行为。探讨MEAW技术的特点,为临床矫治提供指导。方法:在Pro/E中建立上颌MEAW弓丝的三维实体模型,将模型导入ANSYS软件,采用实体单元对模型进行网格划分,并赋予不同的材料属性,模拟临床加载,比较其应力分布。结果:仅施加后倾弯的时候,上颌弓丝在前牙区将产生不利于矫治开的向上向后的力量,同时在后牙区域有使牙弓缩窄的趋势。当在前牙区施加向下的垂直牵引的时候,则上颌前牙区的向上向后的力量得到平衡,而且在后牙区弓丝有使牙弓开大的趋势。结论:MEAW弓丝后牙区的开张趋势将会为牙弓内提供间隙,有利于开的矫治。

Objective：To analyze the stress distribution in MEAW archwire. Method：Build the solid model in Pro/E,then transform them into Ansys,mesh,load and analysis. The material attribute defined individually. Result：When exert vertical traction in anterior teeth on MEAW archwire,the archwire in posterior teeth have different stress distribution. Conclusion：The MEAW archwire have some expand tendency in posterior teeth,and this may provide space in arch.