应用三维有限元法对不同骨质牙种植修复体生物力学的研究

A Three-dimension Finite Element Analysis on Dental Implants Restoration with Different Bone Density

目的:分析4种骨质中两后牙同时缺失时种植体两单冠与联冠修复的最大Von-mises应力值和最大位移值,为4种骨质中两后牙缺失时最佳种植修复寻找理论依据方法:采用三维有限元分析法,建立8个含双种植体的下颌骨三维有限元模型。在第一、第二磨牙区各植入一枚种植体(直径4.0mm、长13mm光滑圆柱形及直径4.8mm、长10mm螺纹圆柱形种植体),采用垂直分散加载100N及颊舌向倾斜45°分散加载45 N,分析种植体-骨界面的最大Von-mises应力值及最大位移值结果:同种骨质中不同修复方式时,最大Von-mises应力值V_单>V_联。最大位移值D_单>D_联。结论:联冠修复方式优于两单冠修复方式。

Objective：A three-dimension finite element model was built to investigate the stress distribution on the implant-bone interface and the deviation of displacement of implant in four bones with different cortical bone thicken on two different loadings,and assess the biomechanical properties of implants with different bone density in the uncoupled and splinted crown,thus to provide reference for molar restoration in clinics.Methods：This study built simplified eight different mandible models.A three-dimension finite element analysis method was used.Two dental implants in the shape of cylinder（4.0×13 mm） and thread（4.8×10 mm） were implanted into the mandibular bone at the position of the first molar and the second molar with different cortical bone thickness.A force load of 100 N vertically and a force load of 45 N under 45°lingually inclined to occlusal were applied relatively to study the stress distribution on the implant-bone interface and the deviation of displacement of implant.Results：①Maximum Von-mises stress values were manifested as V_SV_L when different repair modes were used in the same bone.②When different repair modes were used in homologous bone,the max-values of displacement were manifested as D_SD_L.Conclusion：Splinted crown is a better choice for molars restoration.