【摘要】 目的:证明现有种植体难以完美替代天然形态牙。方法:通过扫描标准模型牙,建立上下颌第一磨牙的三维有限元模型,并对模型施加垂直、水平及斜向3种方向100 N的瞬间载荷,获得各方向载荷下牙齿、黏膜、骨皮质以及骨松质的应力分布情况及最大应力值。结果:上下颌磨牙之间最大应力值差别并不显著,但与传统柱形螺纹种植体之间存在巨大差异。结论:单一形态的种植体难以满足复杂形态的牙齿,尤其是磨牙的功能需要,今后针对磨牙修复的种植体应选择与天然牙形态相近的仿生牙为宜。更多还原

【Abstract】 Objective:To improve that traditional implants could hardly replace those nature-form teeth. Methods:By scanning standard model teeth,the three-dimensional finite element models of first molar teeth were established,and the vertical,horizontal and oblique three-dimensional instantaneous loads were applied to the model to obtain stress distribution and maximum stress of the tooth,mucosa,cortical bone and cancellous bone. Results:There is no significant difference of maximal stress between the first maxillary molar and first mandibular molar,but it is quite different from traditional cylindrical threaded implants. Conclusion:This result suggests that the implant with single form is difficult to meet the functional needs of different teeth,especially molar teeth,and future implant morphology can be expected similar to the natural tooth shape.更多还原