2种接连方式种植体的骨界面应力分析  

Three-dimensional finite element analyses of bone surface stress of two kinds of conjunction implant

作　　者：兰晶[1] 徐欣[1] 姜广水[1] 管延锦[2] 黄海云[1] 蓝菁[1] 

机构地区：[1]山东大学口腔医院种植中心 [2]山东大学材料科学与工程学院模具工程技术研究中心,山东济南250012

出　　处：《华西口腔医学杂志》2008年第4期443-447,共5页West China Journal of Stomatology

基　　金：国家"十五"科技攻关计划资助项目(2004BA720A27)

摘　　要：目的建立2种包含实体种植体的下颌骨三维有限元模型,研究2种接连方式种植体(Replace和Replace Select)的骨界面应力状态。方法测量2种种植体各部件的数据和利用螺旋CT扫描下颌骨截面形态,分别建立2种种植体的三维骨内模型,对模型采用轴向加载200N、30°侧向加载100N载荷,分析2种种植体的骨界面的应力分布趋势。结果2种种植体骨界面应力分布特点均为从种植体颈部至根尖部逐渐减小,应力主要集中在皮质骨区和种植体颈部狭窄处的骨界面;侧向加载时骨界面的应力值均高于轴向加载。无论轴向加载还是侧向加载,Replace Select种植体骨界面的应力值均高于Replace种植体。结论临床修复时应避免种植体受到过大的力,尤其是侧向力,以防出现颈部骨吸收,Replace Select种植体更应注意。Objective To establish a three-dimension finite element model of mandible with two kinds of dental implant and to study the stress of implant-bone interface. Methods Measuring the data of the components of the dental implant and using spiral CT image reconstruction technique to scan the cross section of the mandible. Three- dimension finite element analysis software Unigraphics and MSC. Marc/Mentat were used to build the conjunction model and bone model of two implant systems. Loading 200 N axially and 100 N 30° obliquely on the models respectively, the stress distribution patterns of the bone interface of two implant systems were analyzed. Results The stress distribution on the bone interface of two implant systems was similar. The peak stress of oblique loading was higher than that of axial loading. The peak stress district of the bone was concentrated on the stricture of the implant cervix, which was more obviously displayed on the Replace Select implant. The peak stresses on the bone interface of Replace Select implant were higher than that of Replace implant in all loadings. Conclusion To Replace Select especially, oblique force should be avoided in clinical practice in case of the bone absorption.

关 键 词：牙种植体 有限元分析 界面 

分 类 号：R783.6[医药卫生—口腔医学]