Bozkaya Dinçer, Müftü Sinan
Department of Mechanical Engineering, Northeastern University, 334 Snell Engineering Center, Boston, MA 02115, USA.
J Biomech. 2003 Nov;36(11):1649-58. doi: 10.1016/s0021-9290(03)00177-5.
In evaluation of the long-term success of a dental implant, the reliability and the stability of the implant-abutment interface plays a great role. Tapered interference fits provide a reliable connection method between the abutment and the implant. In this work, the mechanics of the tapered interference fits were analyzed using a closed-form formula and the finite element (FE) method. An analytical solution, which is used to predict the contact pressure in a straight interference, was modified to predict the contact pressure in the tapered implant-abutment interface. Elastic-plastic FE analysis was used to simulate the implant and abutment material behavior. The validity and the applicability of the analytical solution were investigated by comparisons with the FE model for a range of problem parameters. It was shown that the analytical solution could be used to determine the pull-out force and loosening-torque with 5-10% error. Detailed analysis of the stress distribution due to tapered interference fit, in a commercially available, abutment-implant system was carried out. This analysis shows that plastic deformation in the implant limits the increase in the pull-out force that would have been otherwise predicted by higher interference values.
在评估牙种植体的长期成功时，种植体与基台界面的可靠性和稳定性起着重要作用。锥形过盈配合为基台与种植体之间提供了一种可靠的连接方法。在这项工作中，使用封闭形式公式和有限元（FE）方法分析了锥形过盈配合的力学原理。用于预测直线过盈配合中接触压力的解析解被修改，以预测锥形种植体 - 基台界面中的接触压力。弹塑性有限元分析用于模拟种植体和基台的材料行为。通过与有限元模型针对一系列问题参数进行比较，研究了解析解的有效性和适用性。结果表明，解析解可用于确定拔出力和松动扭矩，误差为5 - 10%。对市售基台 - 种植体系统中锥形过盈配合引起的应力分布进行了详细分析。该分析表明，种植体中的塑性变形限制了拔出力的增加，否则拔出力会因更高的过盈值而被预测得更高。
