Savadi Ravindra C, Goyal Chhavi
J Indian Prosthodont Soc. 2010 Sep;10(3):168-75. doi: 10.1007/s13191-010-0035-8. Epub 2011 Feb 1.
The purpose of this article is to do a three-dimensional finite element stress analysis, in relation to root form implant supported by overdenture attachment, during axial and non-axial loading. Two porous coated Titanium-aluminum-vanadium (Ti-6Al-4V) implants with overdenture abutment were embedded in both simple and 3D model of interforaminal region of mandible. The material properties of tissue ingrowth bonded interface were calculated considering Iso-Strain condition. The masticatory forces: axial load of 35 N, a horizontal load of 10 N, and an oblique load of 120 N, was applied for the two qualities of cancellous bone. It implied that porous topography of the implant led to optimal stress transfer at the tissue ingrowth bonded interface and insignificant punching stress at the apex than a smooth surface implant. The inferior bone quality was deformed even under physiologic loads and showed wider stress pattern. Simulated implant abutment to implant bone interface stress may be significantly affected by the quality of the bone and the surface topography of the implant. The interface is affected to a lesser extent by the prosthetic material properties. Threedimensional anatomical model was more close to reality than the geometry of much simpler altered models.
本文的目的是对覆盖义齿附着体支持的根形种植体在轴向和非轴向加载过程中进行三维有限元应力分析。将两个带有覆盖义齿基台的多孔涂层钛铝钒（Ti-6Al-4V）种植体植入下颌骨孔间区域的简单模型和三维模型中。考虑等应变条件计算组织长入粘结界面的材料特性。对两种松质骨质量施加咀嚼力：35 N的轴向载荷、10 N的水平载荷和120 N的斜向载荷。这表明与光滑表面种植体相比，种植体的多孔形貌导致组织长入粘结界面处的应力传递最佳，根尖处的冲压应力不显著。即使在生理载荷下，较差的骨质量也会变形，并显示出更宽的应力模式。模拟的种植体基台到种植体-骨界面的应力可能会受到骨质量和种植体表面形貌的显著影响。该界面受修复材料特性的影响较小。三维解剖模型比简单改变的模型几何形状更接近实际情况。
