On the basis of three-dimensional finite element technique to construct a mandible model of the miniature pig and study its biomechanics / 解放军医学杂志

ABSTRACT

Objective The finite element model of the mandible of the miniature pig was constructed to explore the strain and stress changes of the mandible during loading, which laid the foundation for the analysis of the biomechanical properties of the subsequently developed mandibular external fixation holder. Methods We randomly selected a healthy Bama miniature pig, weighing 20kg, and made a CT scan to its head for obtaining the DICOM data. The DICOM data were imported into the software Mimics17.0 for 3D image reconstruction, and output the STL format. Then we imported the STL format into Geomagic Studio software to make data preprocessing, and got general curved surface file in IGES format. Then we imported the IGES format into ICEM software to carry on the grid, output the UNS grid file, then we imported it into the Workbench software for setting material attributes and definition of boundary conditions, and data post-processing. Applying this model, we simulated the occlusal force and loaded 9.8-392 N vertically downward on the left mandibular first molar, then calculating the strain and stress changes of the mandible and testing the stability of the model. Results Using medical digital image and three-dimensional finite element analysis software, we had successfully established an ideal mandibular model of miniature pig. When loading on the mandible, the results showed that there was no continuous interruption and the data generated were reasonable. Conclusions The three-dimensional finite element model of the mandible of the miniature pig can effectively simulate the strain and stress changes of the mandible, and provide a simulation mechanical analysis for the reasonable design of the external fixationholder .