【作者】 雷蕾；

【导师】 卢燕勤；

【作者基本信息】 中南大学 ， 口腔临床医学， 2011， 硕士

【摘要】 目的：用有限元方法计算分析不同滑动摩擦系数对直丝弓矫治器滑动关闭间隙的影响,探讨摩擦系数与弓丝滑动的关系。方法：本研究采用激光扫描、计算机辅助设计等方法建立了包含上颌全部牙齿,牙周组织,0.019×0.025英寸弓丝和0.022×0.025英寸直丝弓矫治器的三维几何模型,使用Marc2005有限元软件建立了摩擦系数分别为0.15、0.2和0.5滑动关闭间隙的三维非线性有限元模型。将模型中牙齿与牙齿之间,弓丝与托槽之间定义为接触关系.应用MSC.Marc2005有限元软件非线性分析计算摩擦系数不同时弓丝与托槽之间的接触状态的变化,尖牙和磨牙的位移改变以及牙周膜应力分布特点。结果：1.改变摩擦系数,弓丝与托槽的接触状态并无明显改变。2.尖牙和磨牙的位移情况不受摩擦系数改变的影响3.摩擦系数不同,牙周膜应力分布大小和特点一致。结论：采用0.019×0.025英寸的不锈钢弓丝滑动关闭间隙时,模拟弓丝与托槽真实接触状态下,不同大小摩擦系数对滑动阻力无影响。更多还原

【Abstract】 Objective:The purpose of this study was to compare and analyze the effect of different kinetic coefficients of friction to space closure using sliding mechanics by nonlinear finite element method.Method:Firstly, we established a three-dimensional geometry model composed of upper dentition-periodontal tissues-wire-straight wire appliance by laser scanning, CAD and geomagic 5.0, ideas software and three-dimensional nonlinear finite element models which were given different kinetic coefficients of friction by 0.15,0.2 and 0.5were set up. Secondly,in order to simulate the real contact situation, we defined contact relation between teeth, wire and brackets. Finally, the three-dimensional nonlinear finite element models with various kinetic coefficients of friction were calculated using nonlinear finite element method.The contacts between the arch wire and the brackets, the displacement of maxillary canine and the first molar and the periodontal stress distribution under different friction coefficient were analysised.Results:1. The contact state between the arch wire and brackets didn’t change with friction coefficients.2. When the friction coefficient changed, there was no significant difference observed in the displacement of either canine or molar. 3. When the friction coefficient changed, there was no significant difference observed in periodontal stress distribution.Conclusion:The different values of coefficient of friction didn’t affect the resistance of sliding in space closure by sliding mechanics.更多还原