牵张器直径对种植牵张初期稳定性影响的三维有限元分析

Influence of distractor diameter on initial stability of implantal distraction:A three-dimensional finite element analysis

背景:有限元法能够模拟骨外科手术方式,并对模型进行生物力学分析,是一种重要的生物力学分析方法。目的:探讨种植牵张器直径对种植牵张初期稳定性的影响。方法:建立不同直径种植体型牙槽嵴牵张器植入两种骨质类型下颌骨的三维有限元模型,分析骨牵张器界面的应力分布和输送骨段、牵张器的最大变形。结果与结论:骨质良好的牙槽嵴,过分扩大牵张器直径将导致输送段骨应力增大;骨质较差的萎缩牙槽嵴,增大牵张器直径有利于改善骨牵张器复合体的应力分布。结果提示牵张器直径对骨牵张器复合体的应力分布具有重要影响,临床应根据患者种植和牵张两方面的要求合理选择牵张器直径。

BACKGROUND： Finite element analysis can be applied to imitate orthopedic operations and biomechanics analysis of orthopedic model. Finite element analysis has been considered as an important method in surgery for orthopedic biomechanics research. OBJECTIVE： To evaluate the influence of the distractor diameter on the initial stability of implantal distraction. METHODS： Models with different distractor diameters were made by three-dimensional finite element methods. The stress distribution on the surface of distractor and the maximum deformation of the transport bone segment and the distractor were analyzed. RESULTS AND CONCLUSION： For the alveolar ridge with good bone quality, over-expanded the diameter of the distractor might lead to the bone stress increasing on transportation section; for the atrophic alveolar ridge with poor bone quality, increasing the distractor diameter was conducive to improve the stress distribution of the bone-distractor complex Distractor diameter had a major influence on the stress distribution of bone-distractor complex. Appropriate diameter of distractor should be chosen according to both requirement of implant and distraction.