上中切牙压入移动的力学仿真分析  

Numerical simulation on the intrusion movement of upper middle incisor

作　　者：邱靓星[1] 龚媛媛[2] 邓锋[1] 张翼[1] 冉洋 

机构地区：[1]重庆医科大学附属口腔医院正畸科 [2]重庆医科大学附属口腔医院修复科 [3]重庆市光学机械研究所,40000

出　　处：《激光杂志》2011年第2期60-62,共3页Laser Journal

摘　　要：目的:通过有限元仿真法研究在不同角度、不同牙槽嵴高度下压低上颌中切牙时,牙周组织的应力变化和牙的初始位移。方法:采用螺旋CT扫描、Mimics9.0、RapidForm及ANSYS10.0软件获得上颌中切牙、牙周膜主纤维及不同牙槽嵴高度的三维模型,并分别对5种不同加载角度进行模拟计算。结果:随着牙槽嵴高度的降低,牙周膜的初始最大位移值和应力值均增大,无纤维组始终大于纤维组值。当加载角度与牙体长轴成15°、30°、-15°、-30°时,牙槽骨高度降低不及6mm时,各方向的初始位移值均增加,但无显著差异。当牙槽嵴减少6mm时,力值增加显著,无纤维组大于纤维组,舌向加载30°得到最大值75.6E-3MPa.唇侧加载15°获得最小值1.106E-03MPa。结论:舌向30°加载方向得到最大初始最大应力值,唇向15°加载方向获得最小初始最大应力值。在临床压低牙周病患者的上中切牙时加载力的方向应适当向唇侧倾斜。Objective：Analyze the distribution of periodontal membrane stress and initial tooth movement while intruding upper middle incisor in different angle and different alveolar height with Finite Element Analysis（FEA）.Methods： The spiral CT and software of Mimics,RapidForm and ANSYS are employed to create the 3D model of upper middle incisor,periodontal principal fibers and five kinds of alveolar height.Simulate the periodontal memberane stress under five kinds of loading angel separately.Results： Under the vertical force,both the initial maximum of Von-Mises stress and displacement increase,especially the NPFM group.With oblique forces,when the alveolar bone reduced under 6mm,there is no significant difference;when the alveolar bone reduced to 50% especially under the-30° Lingual force,the Von-Mises stress reached the maximum stress 75.6E-03MPa and under the 15° buccal force got the minimum stress 1.106E-03MPa.Conclusion： The-30° Lingual force got the maximum stress and the 15° buccal force got the minimum stress.The direction of loading force should be appropriately tilted to the labial on the upper middle incisors of periodontal disease paticents.

关 键 词：上中切牙 牙周膜主纤维 初始位移 应力 有限元分析 

分 类 号：R781.4[医药卫生—口腔医学]