Finite element analysis of three designs of an implant-supported molar crown
Finite element analysis of three designs of an implant-supported molar crown
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DOI：
10.1016/j.prosdent.2004.08.011
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发表时间：
2004-11-01
影响因子：
4.6
通讯作者：
Morgano, SM
中科院分区：
文献类型：
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作者：
Geramy, A;Morgano, SM
问题陈述。对于单个下颌磨牙冠的最佳种植支持方法存在争议，因为Branemark开发的常用螺纹根形种植体最初并不是为支持单个冠而设计的。本研究的目的是建立单个下颌第一磨牙冠的有限元模型，包括(1)标准直径3.75 mm种植体，(2)5 mm大直径种植体，(3)双标准直径种植体，并比较不同加载条件下的位移。建立三维有限元模型，模拟3种单磨牙种植体设计。每个模型都被分析了两种力的大小(35N和70N)和两种力的方向(垂直和与垂直轴成15度)。计算模拟载荷条件下三维空间的位移，分别为近远中轴、面舌轴和上下轴。与3.75 mm种植体相比，在远中颊尖端或远中缘脊加载时，直径为5min的种植体支持的冠的近远中和颊舌向位移比3.75 mm的种植体减少了约50%。双种植体设计在牙冠偏心加载的情况下，记录了最小的近远中位移。当牙冠偏心加载时，双种植体设计比单种植体设计产生的位移要小得多。
Statement of problem. The optimal method of implant support for a single mandibular molar crown is controversial because commonly used, threaded, root-form implants developed by Branemark were not originally designed to support individual crowns.Purpose. The purpose of this study was to develop a finite element model of a single mandibular first molar crown supported by (1) a standard 3.75-mm-diameter implant, (2) a 5-mm, wide-diameter implant, and (3) double standard-diameter implants, and to compare the induced displacements as a result of various loading conditions.Material and methods. Three-dimensional finite element models were made to simulate the 3 single-molar implant designs. Each model was analyzed with 2 force magnitudes (35 N and 70 N) and with 2 force directions (vertical and 15 degrees to the vertical axis). Displacements in 3-dimensional space as a result of the simulated loading conditions were evaluated along 3 primary axes, mesiodistal, faciolingual, and superior-inferior.Results. Mesiodistal and buccolingual displacements for the crown supported by the 5-min-diameter implant were reduced by approximately 50% compared with the crown supported by the 3.75-mm implant when the crowns were loaded at the distobuccal cusp tip or the distal marginal ridge. The double-implant design recorded the least mesiodistal displacement with off-center loading of the crown.Conclusion. When the crown was loaded off-center, the double-implant design produced substantially less displacement when compared with either of the single-implant designs.