种植牙周围颌骨的骨重建模拟

The bone remodelling simulation of jawbone surrounding dental implants

研究的目的是通过骨重建模拟来预测种植牙植入后周围颌骨的密度分布情况。基于两种成熟且得到广泛应用的骨重建理论,提出了一种新的模拟骨重建的算法,该算法既包含了"死区效应",同时又是基于自组织控制过程。建立了包含种植体和颌骨在内的二维有限元模型,并用文中提出的算法对种植牙周围骨骼组织的密度分布情况进行了骨重建模拟,同时讨论了控制方程中的两个参数(死区大小和单位质量参考应变能密度)对颌骨密度分布的影响情况;结果表明,死区大小对骨密度分布的影响比单位质量参考应变能密度的影响要小;数值模拟与临床观察结果比较吻合,表明该算法是有效的。

This study aims to predict the density distribution in human jawbone surrounding a dental implant.Based on the two popular,yet distinctive theories for bone remodeling,a new remodeling algorithm is proposed which takes into account both the ＇lazy zone＇ effect and the self-organizational control process.To demonstrate the ability of the proposed algorithm in predicting the density distribution of bone surrounding a dental implant,a 2D finite element model of implant and jawbone is studied.The effects of two parameters,viz the reference value of strain energy density（SED） and ＇lazy zone＇ region,on the density distribution are also investigated.The proposed algorithm is proven to be effective and the predicted results correlates well with clinical observations.This study has demonstrated that consideration of the lazy zone is less important than consideration of the SED induced within the bone.