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目的:建立微种植体正畸支抗的三维有限元模型,分析不同倾斜角度下植入微种植体时,不同载荷对种植体-骨界面的生物力学变化,为微种植体正畸支抗的临床应用提供理论依据。方法:利用计算机辅助设计和有限元软件处理,建立倾斜角度分别为30°,45°,60°,90°的4组微种植体支抗模型,分析在0.98N(100g力)、1.96N(200g力)、2.94N(300g力)、3.92N(400g力)水平力作用下,微种植体-骨界面应力及位移的分布情况。结果:不同角度不同载荷下微种植体颈部为应力集中区,Von-Mises应力及位移峰值随倾斜角度的增大而增大。微种植体90°植入,在3.92N(400g力)水平力作用下最大Von-Mises应力峰值为19.263MPa,最大位移峰值为1.2344μm。结论:微种植体可在90°内载荷3.92N(400g力)以内的水平向正畸力。减小微种植体的倾斜角度,可以提高其载荷水平向正畸力的能力,提示临床应选择尽量倾斜于颊侧牙槽骨的方向植入微支抗种植体。
OBJECTIVE: To establish a three-dimensional finite element model of orthodontic anchorage of micro-implants and analyze the biomechanical changes of implant-bone interface with micro-implants implanted under different tilt angles. Provide a theoretical basis for clinical application. Methods: Four groups of micro-implant anchorage models with tilted angles of 30 °, 45 °, 60 ° and 90 ° were established by using computer aided design and finite element software. The results were analyzed in 0.98N (100g force), 1.96N 200g force), 2.94N (300g force) and 3.92N (400g force), the distribution of stress and displacement at micro-implant-bone interface. Results: The neck of the micro-implant under different loads and different loads was the stress concentration area. The Von-Mises stress and displacement peak increased with the increase of the inclination angle. The maximal Von-Mises stress peak was 19.263 MPa and the maximum displacement peak was 1.2344 μm when the micro-implant was implanted at 90 ° under the force of 3.92N (400g force). Conclusions: Micro-implants can translate orthodontic forces horizontally within 90 ° to 3.92 N (400 g force). Decreasing the tilt angle of micro-implants can improve the ability of loading level to orthodontic force, suggesting that micro-implant implants should be implanted in the direction of aslant as possible to the buccal alveolar bone.