【摘要】 微植体支抗系统(MIA)在口腔正畸治疗中应用较多,由于骨的粘弹塑性性质,在微植体正畸力作用下会产生具有时效特性的弹塑性变形。本文基于骨的粘弹塑性性质建立了上颌骨微植体支抗-骨界面的三维有限元模型,骨由皮质骨和松质骨构成,数值模拟了骨在微植体正畸力作用下的时效特性。观察加载后骨界面的应力分布,发现微植体颈部应力比较集中,周围皮质骨中的应力相对较高,骨内产生了具有时效特性的弹塑性变形。更多还原

【Abstract】 Micro-implant anchorage(MIA) is widely applied in orthodontic treatment.The elasto-plastic deformation with time effect occurs under the orthodontic loadings of MIA due to the viscoelasto-plasticity of maxilla.In the paper a three-dimensional finite element model was established describing the mini-screw and the bone,the latter being composed of cortical bone and cancellous bone.A numerical analysis was presented for the time effect of bone under the orthodontic loadings.The stress concentration was observed at the neck of mini-screw as the higher stress level was found in the cortical shell.The elasto-plastic deformation with time effect in bone was analyzed.更多还原