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目的通过对右侧下颌第1磨牙为种植牙的下颌骨,颏部给予100 N水平力作用的有限元分析,揭示种植体对下颌骨应力传导的影响。方法利用CT图像,建立缺失第1磨牙的下颌骨和种植牙的三维有限元模型,保持下颌骨的边界约束,给予颏部100 N的水平外力作用,分析下颌第1磨牙种植牙区域应力变化和整体下颌骨的应力变化。结果颏部受到水平外力100 N作用后,右侧第1磨牙种植区域断面应力变化:10.37 mm与86.38 mm位置出现应力最低,其最大应力峰值分别为9.005 Pa、9.067 Pa;52.97 mm位置处出现应力最大,应力的峰值94.962 Pa。左侧第1磨牙断面应力变化:10.82 mm与83.82mm位置出现应力最低,其最大应力峰值分别为18.227 Pa、8.867 Pa;54.66 mm位置处出现应力最大,应力的峰值93.912 Pa。下颌骨的整体应力变化:颏部受力部位最大,最大的应力峰值为260.524 Pa。结论一定条件下第1磨牙位置的种植体植入不影响下颌骨的正常下颌骨的应力传导。
OBJECTIVE: To investigate the effect of implants on mandibular stress conduction through the finite element analysis of the effect of 100 N horizontal force on the mandibular first molar of the right mandible. Methods Three-dimensional finite element models of the mandibular and implants with missing first molar were established by using CT images. The mandibular boundaries were restrained and the lateral external force of 100 N was applied to the chin. The overall mandibular changes in stress. Results After stress of 100 N on horizontal chin, the stress changes in the first molar area on the right side showed the lowest stress at 10.37 mm and 86.38 mm, and the maximum stress peaks were 9.005 Pa and 9.067 Pa respectively. Stress at 52.97 mm Maximum, peak stress 94.962 Pa. The stress changes of the first molar on the left side were the lowest at 10.82 mm and 83.82 mm, and the maximum stress peaks were 18.227 Pa and 8.867 Pa respectively. The stress peaked at 54.66 mm and the peak stress was 93.912 Pa. The overall mandibular stress changes: the chin stress part of the largest, the maximum stress peak 260.524 Pa. Conclusion Implant placement at the first molar site under certain conditions does not affect the stress transmission in the mandible of the mandible.