种植覆盖义齿修复不同骨质类型的KennedyⅠ类缺失的三维有限元分析

doi:10.13701/j.cnki.kqyxyj.2020.09.013

摘要/Abstract

摘要： 目的: 运用三维有限元的方法探索修复KennedyⅠ类缺失的种植覆盖义齿的附着体与不同骨质之间的应力关系,以为不同骨质选出最适附着体。方法: 建立种植覆盖义齿修复下颌双侧第一前磨牙至第二磨牙缺失的有限元模型。根据骨质类型及附着体类型构建为8个模型:Locator-Ⅰ、Locator-Ⅱ、Locator-Ⅲ、Locator-Ⅳ、Magfit-Ⅰ、Magfit -Ⅱ、Magfit -Ⅲ、Magfit -Ⅳ。分析各部件的应力分布情况,得到最大von Mises应力值及最大位移值。结果: 建立了含有牙体组织、牙周组织、黏骨膜、种植体、附着体、可摘局部义齿以及皮质骨、松质骨的三维有限元模型。无论附着体类型及载荷方向,不同骨质类型中皮质骨、种植体-骨界面的最大等效应力值有Ⅰ<Ⅱ<Ⅲ<Ⅳ,松质骨最大等效应力值则为Ⅱ>Ⅲ>Ⅳ。在受到垂直向力时,在每一种骨质中都有皮质骨、种植体-骨界面、松质骨最大等效应力值Magfit模型>Locator模型,而在非垂直方向时相反。结论: 相较于Locator附着体,Magfit磁性附着体更适合疏松型的骨质。

关键词: Locator附着体, Magfit磁性附着体, 三维有限元, KennedyⅠ类缺失, 骨质类型

Abstract: Objective: To explore the stress relationship between the attachment of implant overdenture for Kennedy class Ⅰ dentition defect and different bone quality by three-dimensional finite element method. Methods: A finite element model of mandibular first premolar to second molar loss was established. Eight models were constructed according to bone type and attachment type: Locator-Ⅰ, Locator-Ⅱ, Locator-Ⅲ, Locator-Ⅳ, Magfit-Ⅰ, Magfit-Ⅱ, Magfit-Ⅲ, and Magfit-Ⅳ. The stress distribution of each component was analyzed to obtain the maximum von Mises stress value and displacement value. Results: Three-dimensional finite element models of tooth tissue, periodontal tissue, mucoperiosteum, implant, attachment, removable partial denture, cortical bone, and cancellous bone were established. Regardless of the type of attachment and the direction of loading, the maximum equivalent stress values of cortical bone and implant-bone interface in different bone types were Ⅰ<Ⅱ<Ⅲ<Ⅳ, and the maximum equivalent stress values of cancellous bone were Ⅱ>Ⅲ>Ⅳ. When applied vertical force, maximum equivalent stress values of cortical bone, implant-bone interface, and cancellous bone in each type of bone were Magfit model > Locator model, and the opposite in the non-vertical direction. Conclusion: Compared to Locator attachment, Magfit magnetic attachment is more suitable for the osteoporotic bone type.

Key words: Locator attachment, Magfit magnetic attachment, three-dimensional finite element, Kennedy class I dentition defect, bone types

缑小蕊, 周政, 姜丹丹, 陈苗苗, 纪东. 种植覆盖义齿修复不同骨质类型的KennedyⅠ类缺失的三维有限元分析[J]. 口腔医学研究, 2020, 36(9): 855-860.

GOU Xiaorui, ZHOU Zheng, JIANG Dandan, CHEN Miaomiao, JI Dong. Three-dimensional Finite Element Analysis of Implant-supported Removable Partial Overdenture for Kennedy ClassⅠDentition Defect with Different Bone Types[J]. Journal of Oral Science Research, 2020, 36(9): 855-860.

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