直丝弓矫治器滑动法关闭间隙的三维非线性有限元研究  

Three-Dimensional Nonlinear Finite Element Study of Space Closure Using Preadjusted Appliance and Sliding Mechanics

作　　者：卢燕勤[1] 高雪梅[1] 韩景芸[2,3] 曾祥龙[1] 

机构地区：[1]北京大学口腔医学院正畸科,100081 [2]北京工业大学机电学院 [3]湖南省长沙市中南大学湘雅医院口腔科

出　　处：《天津医药》2010年第6期461-463,共3页Tianjin Medical Journal

摘　　要：目的:研究直丝弓矫治器滑动法关闭间隙的矫治力学特点。方法:建立上颌牙齿-牙周组织-弓丝-矫治器的整体有限元模型,设定滑动法关闭间隙的力值为150g(1g力=9.80665×10-3N),所用弓丝为0.019英寸×0.025英寸(1英寸=0.0254m)的不锈钢丝,运用非线性计算方法,计算上颌牙列牙周膜的应力分布、弓丝与托槽的接触以及牙齿的初始位移。结果:实验条件下,牙周膜的冯·米赛斯应力、最大主应力、最小主应力范围分别是4.5665×10-4～0.7255MPa、-3.000～9.413MPa及-3.281～8.716MPa,应力分布均匀,无广泛高应力集中区。弓丝与托槽的有效接触点数目、最大接触正压力均表现为后牙少于前牙。中切牙初始位移趋势为远中、牙合向、舌向移动;磨牙呈牙合向、近中倾斜。结论:使用150g力0.019英寸×0.025英寸有利于弓丝滑动关闭间隙。Objective： To explore the mechanics aspects of space closure using preadjusted appliance. Methods： The whole finite element model composed of the upper denture and periodontal tissue, arch wire and appliance was established. The three-dimensional nonlinear finite element method was used to analyze the contacts between arch wire and brackets, the stress distribution in periodontal ligament and the instant displacement of teeth, when a 150 g force and 0.019×0.025 inches stainless steel arch wire was used to close the spaces with sliding method. Results： When a 150 g force was used to close the spaces with sliding method, the Von mises stress, maximum stress and minimum stress were 4.566 5 ×10-4~0.725 5 MPa,-3.000~ 9.413 MPa and 3.281～8.716 MPa in periodontal ligament （PDL）. The distribution of stress was lower and well-distributed in periodontal. The contact points on posterior teeth were least and the contact force was lower between arch wire and slot. Conclusion：Using 150 g force and 0.019 ×0.025 inches stainless steel arch wire to close spaces have the advantage of sliding and corresponding.

关 键 词：有限元分析 非线性动力学 正畸学 矫正 正畸矫正器 

分 类 号：R783.5[医药卫生—口腔医学]