吉林大学学报(医学版)

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自然牙根和种植体联合支持的磁性附着体覆盖义齿应力分析

高翔1,柴健2,王忠厚2,周振平3,王晓薇4   

  1. 1.包头医学院口腔学院修复教研室,内蒙古 包头  014060;2.包头医学院第一附属医院口腔科,内蒙古 包头 014010;3.吉林大学机械工程学院生物力学教研室,吉林 长春130022;4.吉林大学校医院,吉林 长春 130012
  • 收稿日期:2013-11-28 出版日期:2014-07-28 发布日期:2015-01-18
  • 通讯作者: 王晓薇(Tel: 0431- 85168013,E-mail:xwwang@jlu.edu.cn) E-mail:xwwang@jlu.edu.cn
  • 作者简介:高 翔(1972-) ,女,内蒙古自治区包头市人,主任医师,医学硕士,主要从事固定义齿方面的研究。
  • 基金资助:

    内蒙古自治区科技厅社会发展项目资助课题(2010956)

Stress  analysis  of magnetic attachment in mandibular complete overdenture supported by nature roots and implants

GAO Xiang1, CHAI Jian2,WANG Zhong-hou2,ZHOU Zhen-ping3,WANG Xiao-wei4   

  1. 1.Department of Prosthodontics,Stomatology School,Baotou Medical College,Baotou 014060,China;2.Department of Stomatology,First Affiliated Hospital,Baotou Medical College,Baotou 014010,China;3.Department of Biomechanics, School of Mechanical Engineering,Jilin University,Changchun 130022,China;4.Jilin University Hospital,Changchun 130021,China
  • Received:2013-11-28 Online:2014-07-28 Published:2015-01-18

摘要:

目的: 研究自然牙根和种植体联合支持的磁固位全口覆盖义齿不同受力状态下支持骨的应力分布,为临床修复设计提供参考。方法: 采用CT技术、计算机图像处理系统及Solidworks有限元软件,根据自然牙根与种植体不同位置,放置3对磁性附着体,建立3组下颌覆盖义齿的三维有限元模型,其中模型Ⅰ种植体在磨牙区,模型Ⅱ种植体在两侧,模型Ⅲ种植体在一侧。在不同的应力加载下对3组模型中自然牙和种植体颈部骨应力进行计算,对比和分析。结果:模型Ⅱ斜向加载下后牙区种植体周围骨应力较模型Ⅲ增加明显。斜向加载较垂直加载的支持骨应力均有增加,其中模型Ⅰ中的后牙区种植体周围骨应力增加约30%,模型Ⅱ增加约43%,模型Ⅲ增加约55%。结论:当口内仅余留1个自然牙根时,至少应增加2个种植体作为基牙,且这2个种植体应位于牙弓的两侧,即一侧前牙区和另一侧的后牙区。磁性附着体的结构比其他类型的附着体能更好地防止侧向力对基牙的损害。

关键词: 磁性附着体, 覆盖义齿, 有限元模型, 应力分析

Abstract:

Abstract:Objective To analyze the stress state of magnetic attachment in mandibular complete overdenture supported by nature roots and implant,and to provide neference for designing of clinical prosthodentics.Methods Three-dimensional finite models (model,Ⅱ,Ⅲ) of three groups of mandibular overdentures depending on the different location of the implant and natural tooth root,placing three pairs of magnetic attachment,were constructed by application of CT scanning,computer photo processing system,and Solidworks finite element model building   software.The natural teeth and implant neck bone stress of the models in three groups under different stress were calculated and compared.Results The stress of the bone around the implant in the area of molar teeth in model with both sides of the implants under oblique load (Model Ⅱ)  was significantly increased compared with the model with one side of the implant(Model Ⅲ).The supporting bone stress of oblique load was increased compared with the vertical load;among them under the oblique load at one side’s molar teeth,the stress of the bone around the implant in the area of molar teeth in modelⅠ,modelⅡ and model Ⅲ was increased about 30%,43%,and 55%.Conclusion When there only one nature teeth remain,two implants should be at least added,one in the area of opposite cuspid,and the other in the area of  molar teeth of the same side.The magnetic attachment is better than other kinds of attachment in preventing the damage of abutment when it suffers inclined load.

Key words: magnetic attachment, overdenture;finite element , model;stress analysis

中图分类号: 

  • R783.6