Astra Tech AB, SE-431 21 Mölndal, Sweden.
J Biomech. 2011 Apr 7;44(6):1059-65. doi: 10.1016/j.jbiomech.2011.02.002. Epub 2011 Feb 26.
The osseointegration of titanium dental implants is a complex process and there is a need for systematization of the factors influencing anchoring of implant. A common way of analyzing the strength of the fixation in bone is by measuring the torque required to remove the implants after healing. In this paper, a global biomechanical model is introduced and derived for removal torque situations. In this model, a gap is allowed to form between the bone and the implant and the size of the gap at fracture is a function of the surface roughness and can be shown to be directly related to the mean slope of the surface. The interfacial shear strength increases almost linearly with the mean slope and was also found to increase with an increase in the 2D surface roughness parameter, R(a). Besides the surface roughness, the design of the implant, the bone anatomy and the bone quality were shown to influence the interfacial shear strength. The Global biomechanical model can be used as a tool for optimizing the implant design and the surface topography to obtain high anchoring strength.
钛种植牙的骨整合是一个复杂的过程，需要对影响种植体锚固的因素进行系统分析。一种常见的分析骨内固定强度的方法是测量愈合后移除种植体所需的扭矩。本文引入并推导了一种用于移除扭矩情况的整体生物力学模型。在该模型中，允许在骨和种植体之间形成间隙，并且断裂时间隙的大小是表面粗糙度的函数，并且可以表明与表面的平均斜率直接相关。界面剪切强度几乎与平均斜率呈线性增加，并且还发现随着二维表面粗糙度参数 R(a)的增加而增加。除了表面粗糙度外，种植体的设计、骨骼解剖结构和骨骼质量也被证明会影响界面剪切强度。整体生物力学模型可用作优化种植体设计和表面形貌以获得高锚固强度的工具。
