天然牙-种植体共同支持式固定义齿的生物力学研究Ⅰ.垂直集中载荷对种植体、天然牙骨界面应力的影响

目的:通过对天然牙-种植体共同支持式固定义齿受垂直集中载荷时,种植体、天然牙骨界面应力分布情况进行测试,为临床能否使用该方式修复牙列缺损提供生物力学的理论依据。方法:应用电阻应变计电测技术的方法。结果:天然牙-种植体共同支持式固定义齿修复时,在垂直集中载荷下,随着载荷的不断加大,天然牙-种植体与骨组织界面处的应力值不断加大,最大应力出现在种植体、天然牙根颈部区,种植体与稳固的天然牙共同支持式固定修复时,天然牙与骨界面应力分布较均匀。结论:从生物力学的角度来看,在优化临床设计的前提下,天然牙-种植体共同支持式固定义齿是临床可采用的特殊固定义齿,尤其适用于末端游离缺牙的患者。

Biomachanics Study on Tooth-implant Supported Fixed Denture Ⅰ.Stress of The Bone Interface of Implant and Tooth under Concentrated Axial Loading

Objective:The present study was to investigate the stress distribution of bone interface in tooth-implant supported fixed denture under concentrated axial loading.Analysis its characterics in order to give a theory director of biomachanics for clinical application.Methods: Strain Measuring Technique Results:More concentrated axial loading was added on tooth-implant supported fixed denture,more stress was found on the interface of bone-implant and bone-tooth.The most stress was found on the neck of bone-implant and bone-tooth.The stress distribution of tooth was uniform when implant linked stable tooth.Conclusion: On the biomachanics,under the best design,tooth-implant supported fixed denture is an extra fixed denture for clinical application.