论文部分内容阅读
目的:探索基于CBCT扫描图像快速建立下颌第一前磨牙三维有限元模型的方法。方法:选用经测量基本符合中国人牙尺寸平均值的成人下颌第一前磨牙,表面处理,石蜡包埋,应用CBCT扫描技术获取层厚为0.1 mm的205张离体牙断层影像,导入Mimics 10.01软件获得轮廓线点云,结合Magics 9.9图像处理软件,HyPerMesh网格自动划分软件,通过特定Abaqus 6.10软件建立下颌第一前磨牙三维有限元模型,并对模型进行力学加载。结果:准确地建立了下颌第一前磨牙三维有限元模型,共生成8725个单元和1874个节点,所得模型具有良好的几何相似性与生物力学相似性。从应力分布来看垂直载荷下牙体出现两个应力集中区,即加载区和牙颈部,牙颈部应力值明显小于加载区。结论:采用CBCT技术与Mimics、Anesys软件相结合建模的方法快速可行,为以后进行三维有限元分析提供了精确的模型。
OBJECTIVE: To explore a method for rapidly establishing 3D finite element model of mandibular first premolar based on CBCT scan images. Methods: The adult mandibular first premolar measured by the average size of Chinese human teeth was treated with surface-treated and paraffin-embedded. CBCT scans were used to obtain 205 slices with a slice thickness of 0.1 mm. The images were imported into Mimics 10.01 The software obtains contour point cloud, and combines with Magics 9.9 image processing software and HyPerMesh grid automatic division software to establish the three-dimensional finite element model of mandibular first premolar through Abaqus 6.10 software, and loads the model mechanically. Results: The three-dimensional finite element model of the mandibular first premolar was established accurately. A total of 8725 elements and 1874 nodes were generated. The obtained model has good geometric similarity and biomechanical similarity. From the stress distribution point of view under vertical load, there are two stress concentration areas in the tooth, that is, the loading area and the cervical part. The stress value in the dental neck is obviously smaller than that in the loading area. Conclusion: The method of CBCT combined with Mimics and Anesys software is fast and feasible, which provides an accurate model for the subsequent three-dimensional finite element analysis.