Department of Oral and Maxillofacial Surgery, West China College of Stomatology, Sichuan University, No. 14, 3rd Section, Renmin South Road, Chengdu 610041, PR China.
Comput Methods Programs Biomed. 2013 Sep;111(3):642-9. doi: 10.1016/j.cmpb.2013.05.024. Epub 2013 Jun 28.
The aim of this study is to describe the sequential software processing of computed tomography (CT) dataset for reconstructing the finite element analysis (FEA) mandibular model with custom-made plate, and to provide a theoretical basis for clinical usage of this reconstruction method. A CT scan was done on one patient who had mandibular continuity defects. This CT dataset in DICOM format was imported into Mimics 10.0 software in which a three-dimensional (3-D) model of the facial skeleton was reconstructed and the mandible was segmented out. With Geomagic Studio 11.0, one custom-made plate and nine virtual screws were designed. All parts of the reconstructed mandible were converted into NURBS and saved as IGES format for importing into pro/E 4.0. After Boolean operation and assembly, the model was switched to ANSYS Workbench 12.0. Finally, after applying the boundary conditions and material properties, an analysis was performed. As results, a 3-D FEA model was successfully developed using the softwares above. The stress-strain distribution precisely indicated biomechanical performance of the reconstructed mandible on the normal occlusion load, without stress concentrated areas. The Von-Mises stress in all parts of the model, from the maximum value of 50.9MPa to the minimum value of 0.1MPa, was lower than the ultimate tensile strength. In conclusion, the described strategy could speedily and successfully produce a biomechanical model of a reconstructed mandible with custom-made plate. Using this FEA foundation, the custom-made plate may be improved for an optimal clinical outcome.
本研究旨在描述 CT 数据集的顺序软件处理过程，以重建带有定制板的有限元分析（FEA）下颌模型，并为该重建方法的临床应用提供理论依据。对一名患有下颌连续性缺损的患者进行了 CT 扫描。将 DICOM 格式的此 CT 数据集导入 Mimics 10.0 软件中，该软件重建了面部骨骼的三维（3-D）模型，并分割出下颌骨。在 Geomagic Studio 11.0 中，设计了一个定制板和九个虚拟螺钉。将重建下颌骨的所有部分转换为 NURBS 并保存为 IGES 格式，以便导入 pro/E 4.0。完成布尔运算和组装后，将模型切换到 ANSYS Workbench 12.0。最后，施加边界条件和材料特性后进行分析。结果，成功地使用上述软件开发了 3-D FEA 模型。应力-应变分布精确地指示了正常咬合载荷下重建下颌骨的生物力学性能，没有应力集中区域。模型各部分的 Von-Mises 应力，从最大值 50.9MPa 到最小值 0.1MPa，均低于极限拉伸强度。总之，所描述的策略可以快速成功地生成带有定制板的重建下颌骨的生物力学模型。使用此 FEA 基础，可以改进定制板以获得最佳的临床效果。
