柱形锥形种植体在不同种植深度的三维有限元研究

Three-dimensional finite element study of cylindrical implants and conical implants at different planting depths

目的运用三维有限元的方法研究柱形种植体和锥形种植体在颌骨内不同种植深度的应力分布。方法以Astra Tech Osseo SpeedTM5.0sTX为参考,应用Solidworks软件模拟建立柱形种植体和锥形种植体、基台及牙冠,分别位于不同种植深度时的骨质模型,导入Abaques有限元软件,在牙冠上斜向加载45°180 N的力,分析柱形和锥形种植体在不同种植深度的Von-mises应力分布变化。结果 45°180 N载荷下,柱形锥形种植体最大应力均集中出现在种植体-基台交界处;随着种植体在牙槽骨内种植深度的增加,两种种植体均出现应力分布范围加大趋势;相同载荷下,锥形种植体比柱形种植体应力分布范围更小。结论从种植体形状和种植深度因素考虑,锥形种植体受应力比柱形种植体小,种植时尽量避免过深种植。

Objective To study the stress distribution of cylindrical implants and conical implants at different implant depths in jaw by using three-dimensional finite element method.Methods With Astra Tech Osseo SpeedTM5.0 sTX as reference,Solidworks software was used to simulate and establish the bone models of cylindrical implant and conical implants,abutments and crowns,respectively.The bone models were imported into abaques finite element software,and the force of 45°180 N was obliquely loaded on the crown.The Von-mises stress distribution of cylindrical implants and conical implants at different planting depths was analyzed.Results Under 45°180 N load,the maximum stress of cylindrical implants and conical implant appeared at the junction between implant and abutment.With the increase of implant depth in alveolar bone,the stress distribution range of both implants increased,and under the same load,the distribution of stress in conical implant was smaller than that in cylindrical implant.Conclusion Considering the shape and depth of implant,the stress of conical implant is smaller than that of column implant,so too deep planting should be avoided when implanting.