全牙列下颌骨体部三维有限元模型操作平台的构建

Construction of platform on the three-dimensional finite element model of the dentulous mandibular body of a normal person

目的探讨建立正常人全牙列下颌骨体部三维有限元模型的方法,为下颌骨体部及下牙列的生物力学分析提供一个操作平台。方法应用CT获取层厚为0.1mm的CT断层影像,经自编软件提取部分图片轮廓关键点,运用自编程序生成Ansys可识别文件,在Ansys三维有限元分析软件中建立下颌骨体部及下牙列三维有限元模型的分析操作平台。结果建立了更精确、模拟功能更强的含下牙列的下颌骨体部三维有限元模型操作平台,既能精确显示其三维空间结构和形态,又能模拟临床各种牙列缺损状态。结论建立牙尖形态逼真、可作灵活模拟操作的含下牙列的下颌骨体部三维有限元模型,为进行临床各种牙列缺损状态及其修复的生物力学分析提供良好的平台。

Objective To develop a method to construct a three-dimensional finite element model of the dentulous mandibular body of a normal person. Methods A series of pictures with the interval of 0.1 mm were taken by CT scanning. After extracting the coordinates of key points of some pictures by the procedure, we used a C program to process the useful data, and constructed a platform of the three-dimensional finite element model of the dentulous mandibular body with the Ansys software for finite element analysis. Results The experimental results showed that the platform of the three-dimensional finite element model of the dentulous mandibular body was more accurate and applicable. The exact three-dimensional shape of model was well constructed, and each part of this model, such as one single tooth, can be deleted, which can be used to emulate various tooth-loss clinical cases. Conclusion The three-dimensional finite element model is constructed with life-like shapes of dental cusps. Each part of this model can be easily removed. In conclusion, this experiment provides a good platform of biomechanical analysis on various tooth-loss clinical cases.