Finite element analysis of implant-embedded maxilla model from CT data: Comparison with the conventional model
Finite element analysis of implant-embedded maxilla model from CT data: Comparison with the conventional model
复制标题
DOI：
10.1016/j.jpor.2010.07.002
复制
发表时间：
2011-01-01
影响因子：
3.6
通讯作者：
Nomura, Shuichi
中科院分区：
文献类型：
--
作者：
Okumura, Nobuaki;Stegaroiu, Roxana;Nomura, Shuichi
目的：目前还没有完整的上颌有限元分析模型，为常规分段有限元分析模型的尺寸提供参考依据。本研究的目的是：(1)建立一个源自人类颅骨的上颌模型，并研究其内嵌后牙种植体周围的应变分布；(2)探讨常规上颌节段模型的可用性。方法：将人干颅骨上颌骨的CT DICOM数据导入Mesh Generation Tools （ANSYS AI环境），并将计算机生成的种植基台单元双皮质嵌入其中。在这个大型模型中，通过有限元程序计算了轴向和颊舌载荷下的Von Mises应变。此外，计算机生成两个简化的上颌节段（简化模型），并计算其Von Mises应变。结果：虽然绝对值有明显差异，但皮质骨的应变分布模式与简化模型相似：轴向载荷下，皮质骨的高Von Mises应变集中在种植体顶端周围的窦底，在颊舌载荷下集中在种植体颈部周围的牙槽嵴。结论：简化和分段的人上颌骨三维有限元模型与基于CT DICOM数据建立的完整上颌骨模型具有相同的最高等效应变位置。如果对绝对应变值不感兴趣，简化模型可用于模拟上颌骨的应变分析，为种植体放置的诊断提供建议。(C) 2010年日本口腔修复学会。由爱思唯尔爱尔兰出版。版权所有。
Purpose: There are no entire maxillary finite element analysis models available, as a base of reference for the dimensions of conventional segment finite element analysis models. The objectives of this study were: (1) to construct a maxillary model derived from a human skull and to investigate the strain distribution around a posterior implant embedded in it; (2) to investigate the usability of conventional segment maxillary models.Methods: CT DICOM data of a human dried skull maxilla was imported into the Mesh Generation Tools (ANSYS AI environment) and a computer-generated implant-abutment unit was bicortically embedded into it. In this Large model, Von Mises strains under axial and buccolingual loads were then calculated by a finite element program. Moreover, two simplified maxillary segments (Simplified models) were computer-generated and their Von Mises strains were similarly calculated.Results: Although absolute values differed markedly, strain distribution patterns in the cortical bone were similar to those in the Simplified models: high Von Mises strains in the cortical bone concentrated in the sinus floor around the implant apex under axial load, and in the alveolar crest around the implant neck under buccolingual load.Conclusions: The simplified and segmented three-dimensional finite element models of the human maxilla showed the same locations of the highest equivalent strains as the full maxilla model created from CT DICOM data. If absolute strain values are not of interest, the Simplified models could be used in strain analyses of simulated posterior maxilla for diagnostic suggestions in implant placement. (C) 2010 Japan Prosthodontic Society. Published by Elsevier Ireland. All rights reserved.