不同大小的后方牵引力对鼻上颌复合体影响的三维有限元分析(1)
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[摘要]目的：探讨不同大小的后方牵引力与鼻上颌复合体内部应力分布及位移的关系，以达到为临床矫治力的选择提供科学依据的目的。方法：利用有限元软件ANSYS10.0在鼻上颌复合体三维有限元模型上分析5种大小的后方牵引力对鼻上颌复合体内部应力分布和位移的影响。结果：随着后方牵引力值的增大，A点和ANS点向后位移也逐渐增大，而N点向前移动，但N点的位移量很小，变化呈线性关系。且A点、ANS点和N点的应力值也逐渐增大。结论：施加不同大小的后方牵引力，鼻上颌复合体的应力和位移随牵引力值的增大而增大，而每侧3～5N后牵引力即可引起上颌骨明显的后方移位。
[关键词]后方牵引力；鼻上颌复合体；三维有限元方法；位移；应力发布
[中图分类号]R783 [文献标识码]A [文章编号]1008-6455(2011)01-0055-03
Three dimensional finite element (3D-FEM) study on the influence of different sizes of distally-directed force for nasomaxillary complex
CHEN Jiang-hao1,2,ZHOU Hong2,DAI Quan2
(1.Deptement of Stomatology,The First Affiliated Hospital of Xi'an Jiaotong University,Xi'an 710061,Shaanxi,China;2.Orthodontic department,Stomatology hospital of Xi'an Jiaotong University)
Abstract: Objective To investigate the relationship between the displacement and stress distribution in the nasomaxillary complex and the strength of distally-directed extra-oral forces, to provide the scientific basis for the selection of orthopedic force in clinical treatment.MethodsFive different sizes of distally-directed extra-oral forces were added to the model of nasomaxillary complex, usingANSYS 10.0 software to analyse the displacement and stress distribution in the nasomaxillary complex. ResultsWhen the strength of distally-directed extraoral forces increased, A point and ANS point's distal displacement was added, and N point moved to mesial, but it was displacement very potty. All of the changes were linearity and the stresses of A, ANS, and N points were added as well.Conclusion When the strength of distally-directed extraoral forces increased,the displacement and stress distribution of the nasomaxillary complex also added, and 3～5N force caused the maxilla distally displacement clearly.
Key words: distally-directed extraoral forces; nasomaxillary complex; three-dimensional finite method; displacement;stress
1866 年 Kinsley 首先使用了口外弓治疗牙齿前突。在20世纪40 年代由于头影测量技术的产生和发展，使许多正畸医师充分认识了口外力在矫正过程中的重要作用。后牵引矫形治疗成为临床上常用的抑制上颌骨过度发育的矫治手段之一。本研究采用三维有限元法探讨不同大小的后牵引力与鼻上颌复合体内部应力分布及位移的关系，为临床矫形力的选择和设计提供生物力学依据。
1材料和方法
1.1鼻上颌复合体三维有限元模型的建立：有限元法的关键是模型的建立 ......
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