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论文摘要

微植体支抗滑动法内收上颌前牙的三维有限元研究

Three dimensional finite element analysis of maxillary anterior teeth retraction with micro-implant anchorage and sliding mechanics

作者:张翼 张磊 樊瑜波 宋锦璘 邓锋

Author:ZHANG Yi1, ZHANG Lei2, FAN Yu-bo3, SONG Jin-lin1, DENG Feng1

收稿日期:2009-10-25          年卷(期)页码:2009,27(05):557-557-560

期刊名称:华西口腔医学杂志

Journal Name:West China Journal of Stomatology

关键字:三维有限元,微种植体支抗,直丝弓,

Key words:three dimensional finite element,micro-implant anchorage,straight wire,

基金项目:

国家自然科学基金资助项目(10572160);重庆市科委科研基金资助项目(CSTC2005BB5265)

中文摘要

目的探讨不同微螺钉种植体植入高度以及不同牵引钩高度对微植体支抗滑动法内收上颌前牙的生物力学效应的影响。方法采用高精度螺旋CT扫描结合MIMICS快速三维重建的方法建立微植体-直丝弓上颌前牙内收力系的三维有限元模型,并在准确构建托槽、牙齿、弓丝、微种植体的力学关系基础上计算当微种植体植入高度为4、8 mm时以及牵引钩高度为1、4、7、10 mm时上颌前牙的初始移动情况。结果随着牵引钩高度的增加,上颌前牙内收时逐渐从冠舌向倾斜移动变为冠唇向移动;微种植体高位植入更有利于上颌前牙内收时的压入移动。结论通过微种植体植入高度和牵引钩高度的变化可以有效控制上颌前牙内收的牙齿移动方式。

英文摘要

Objective To investigate the biomechanical effects of micro-implant anchorage technique with sliding mechanics on maxillary anterior teeth retraction under different implant insertion heights and different retraction hook heights. Methods The three dimensional finite element model of maxillary anterior teeth retraction force system was constructed with CT scanning and MIMICS software and the relationships between brackets, teeth, wire and microimplant were simulating the clinical factions. Then the initial tooth displacement was calculated when the insertion heights were 4 mm and 8 mm and the retraction hook heights were 1, 4, 7, 10 mm respectively. Results With retraction hook height added, the anterior teeth movement changed from lingual crown tipping to labial crown tipping and the intrusion movement was more apparent when the micro-implant was inserted in a higher location. Conclusion The ideal teeth movement control could be achieved by different insertion heights of micro-implant and different retraction hook heights in straight wire retraction force system.

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