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目的:探讨正畸微种植体支抗长度和直径对I类骨质下颌骨的应力和微种植体稳定性的影响,为临床设计I类骨质中微种植体支抗的最佳长度和直径提供理论依据。方法:建立包含正畸微种植体支抗的颌骨骨块的三维有限元模型,设定微种植体的直径和长度为变量,直径变化范围1.0～1.8mm,长度变化范围5.0～11.0mm。设定颌骨平均主应力峰值和正畸微种植体支抗位移峰值为目标函数。观察设计变量变化对目标函数的影响。结果:随着直径的增加,皮质骨、松质骨应力峰值和种植体位移分别降低了67.98%,64.06%,78.55%;随着长度变化皮质骨、松质骨的应力峰值和种植体位移分别降低了13.94%,61.32%,0.01%。结论:种植体支抗的直径对I类骨质颌骨的应力和种植体支抗稳定性的影响更显著。长度对I类骨质颌骨的应力和种植体支抗稳定性的影响并不显著。从生物力学角度而言,直径大于1.4mm种植体支抗更加适用于I类骨质的颌骨。
OBJECTIVE: To investigate the effect of orthodontic micro-implant length and diameter on the stress and micro-implants stability of type I mandibular mandibula and the optimal length and diameter of clinically designed type I micro-implant implants Provide a theoretical basis. Methods: The three-dimensional finite element model of mandibular bone with orthodontic micro-implant support was established. The diameter and length of micro-implant were set as variables. The diameter ranged from 1.0 to 1.8 mm and the length ranged from 5.0 to 11.0 mm. The maximal mean principal stress of jaw and peak of displacement of orthodontic micro-implant were set as the objective function. Observe the influence of design variables on the objective function. Results: With the increase of diameter, the stress peak of cortical bone and cancellous bone and the displacement of implant decreased by 67.98%, 64.06% and 78.55% respectively. With the change of length, the stress peak of cortical bone and cancellous bone and the displacement of implant were respectively Decreased 13.94%, 61.32%, 0.01%. CONCLUSIONS: The diameter of implant support has a more significant effect on the stress and implant stability of type I osteoid jaws. Length had no significant effect on the stress and implant stability of type I osteal bone. From a biomechanical point of view, implant supports larger than 1.4 mm in diameter are more suitable for Class I bone jaws.