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目的:探索微型种植体颈部柱状构型对骨界面应力分布的影响。方法:设定种植体颈部为光滑柱状结构,高度分别为0mm、0.5mm、1mm、1.5mm、2mm。分别建立1mm、2mm皮质骨厚度的微型种植体-颌骨有限元模型,比较正畸加载下骨组织内应力分布的情况。结果:颈部柱状种植体-骨界面应力分布明显均匀,传统螺纹种植体-骨界面应力分布较集中。颈部柱状高度的变化对骨界面应力分布影响不大。结论:本三维有限元分析结果表明颈部柱状结构能明显改善微型种植体-骨界面应力分布。
OBJECTIVE: To investigate the effect of cervical columnar configuration on stress distribution in bone interface. Methods: Set the neck of the implant as a smooth columnar structure with the height of 0mm, 0.5mm, 1mm, 1.5mm and 2mm respectively. Micro-implants-jaw finite element models of 1 mm and 2 mm cortical bone thickness were established respectively, and the stress distribution in bone tissues under orthodontic load was compared. Results: The stress distribution on the neck columnar implant-bone interface was obviously uniform and the stress distribution on the traditional screw implant-bone interface was more concentrated. The change of columnar height has little effect on the stress distribution of the bone interface. CONCLUSION: The results of this three-dimensional finite element analysis show that the cervical columnar structure can significantly improve the stress distribution on the micro-implant-bone interface.