CAJ | 학술논문

背景：双侧升支矢状劈开截骨已经成为矫正面部畸形的常规方法，运用有限元方法研究双侧下颌支矢状劈开内固定后颞下颌关节及下颌骨的生物力学是一种重要途径。目的：建立精确、高仿真的双侧下颌支矢状劈开内固定后包含颞下颌关节的下颌骨模型，为研究双侧下颌支矢状劈开内固定后下颌骨及颞下颌关节生物力学提供基础。方法：螺旋CT扫描后得到DICOM格式数据导入MIMICS软件建立下颌骨三维模型。将三维模型包裹成单一的封闭壳，在ANSYS中进行网格划分及转换，再将模型写入ANSYS软件进行颞下颌关节相应部分的重建并模拟双侧下颌支矢状劈开及术后固定。结果与结论：运用MIMICS及ANSYS软件建立双侧下颌支矢状劈开内固定后的带有颞下颌关节及下颌骨的三维有限元模型。此模型和人体组织相比，具有生物相似性及几何相似性。双侧下颌支矢状劈开内固定后的模型，可以通过前移、后移、旋转移动远心端，再行各种方式的内固定。所建立的三维有限元模型可以根据实验目的不同，对各个部位施加载荷，用来研究双侧下颌支矢状劈开内固定后不同组织应力及位移的改变，也可以研究不同固定材料对固定后稳定性的影响。
배경：쌍측승지시상벽개절골이경성위교정면부기형적상규방법，운용유한원방법연구쌍측하합지시상벽개내고정후섭하합관절급하합골적생물역학시일충중요도경。목적：건립정학、고방진적쌍측하합지시상벽개내고정후포함섭하합관절적하합골모형，위연구쌍측하합지시상벽개내고정후하합골급섭하합관절생물역학제공기출。방법：라선CT소묘후득도DICOM격식수거도입MIMICS연건건립하합골삼유모형。장삼유모형포과성단일적봉폐각，재ANSYS중진행망격화분급전환，재장모형사입ANSYS연건진행섭하합관절상응부분적중건병모의쌍측하합지시상벽개급술후고정。결과여결론：운용MIMICS급ANSYS연건건립쌍측하합지시상벽개내고정후적대유섭하합관절급하합골적삼유유한원모형。차모형화인체조직상비，구유생물상사성급궤하상사성。쌍측하합지시상벽개내고정후적모형，가이통과전이、후이、선전이동원심단，재행각충방식적내고정。소건립적삼유유한원모형가이근거실험목적불동，대각개부위시가재하，용래연구쌍측하합지시상벽개내고정후불동조직응력급위이적개변，야가이연구불동고정재료대고정후은정성적영향。
BACKGROUND:Bilateral-sagitta-split-ramus-osteotomy (BSSRO) has become a conventional method to correct facial deformities, and the finite element method is a significant way to study biomechanics of the mandible and temporomandibular joint (TMJ) after BSSRO. OBJECTIVE: To establish a precise and high simulation model of mandible containing TMJ after BSSRO with internal fixation, which is the base to study the biomechanics of the mandible and TMJ after BSSRO. METHODS: Spiral CT scan was used to get the data of DICOM that were input into MIMICS to establish the three-dimensional model of the mandible. The three-dimensional model was wrapped into a single closed shel for mesh generation and conversion in ANSYS. Then, the model was input into the ANSYS software for temporomandibular joint reconstruction and simulation of BSSRO and internal fixation. RESULTS AND CONCLUSION: The three-dimensional finite element model of mandible containing TMJ after BSSRO was established using MIMICS and ANSYS. This model had biological similarity and geometric similarity in comparison with the human tissues. The model could undergo various internal fixations through antedisplacement, retroposition and rotational movement of the distal end. Based on different experimental purposes, the established model can apply a load to al parts to study changes in stress and displacement of different tissues after BSSRO and internal fixation, and it also can be used to study the effect of different fixation materials on the rear stability after internal fixation.