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目的:探索建立下颌第一磨牙全瓷冠的三维有限元参数化模型。方法:选择1:15倍大小标准下颌第一磨牙模型,经3DSS-STDC-Ⅱ扫描仪扫描获得点云文件,Geomagic软件光滑处理,Unigraphics NX6软件生成模型,通过布尔运算等计算机辅助设计方法生成下颌第一磨牙参数化模型,并通过Office Excel 2007软件驱动参数生成后处理所需的模型。将所建的基本模型导入Ansys Workbench,经过自动网格划分并进行模拟准确性检测。结果:建立了包含饰瓷面厚度和基底面厚度参数的下颌第一磨牙全瓷冠的三维有限元参数化模型。基本模型包含147274个节点及100908个单元,应力分布结果显示,全瓷冠面加载点及颊侧面冠边缘出现应力集中区,等效应力峰值为24.055 Mpa。结论:通过合理的计算机辅助设计建立牙齿及修复体模型方法可行,为进行各类修复体的有限元系列研究提供快速、精确、简便的建模方法。
Objective: To explore and establish a three-dimensional finite element model of mandibular first molar all-ceramic crowns. Methods: 1: 15 times the size of the mandibular first molar model was selected, 3DSS-STDC-Ⅱ scanner scan point cloud file, Geomagic software smoothing, Unigraphics NX6 software to generate models, through the Boolean computing and other computer-aided design method to generate mandibular The first molars parameterize the model and generate the model needed for post-processing with the Office Excel 2007 software driver parameters. The built-in basic model into Ansys Workbench, after automatic meshing and simulation accuracy testing. Results: The three-dimensional finite element model of mandibular first molar all-ceramic crowns with porcelain enamel thickness and basal lamina thickness parameters was established. The basic model contains 147274 nodes and 100908 units. The stress distribution results show that the stress concentration area appears on the porcelain enamel loading surface and buccal crest, and the equivalent stress peak value is 24.055 Mpa. Conclusion: It is feasible to establish the model of tooth and prosthesis through reasonable computer aided design. It provides a fast, accurate and simple modeling method for the finite element study of various prosthesis.