Liu Siyu, Tang Chunbo, Yu Jinhua, Dai Wenyong, Bao Yidong, Hu Dan
Postgraduate student, Institute of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, China.
Assistant Professor, Department of Dental Implantology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, Jiangsu, China.
J Prosthet Dent. 2014 Nov;112(5):1111-8. doi: 10.1016/j.prosdent.2014.04.017. Epub 2014 May 29.
It is unknown whether dental implant systems with a platform-switched configuration have better periimplant bone stress distribution and lead to less periimplant bone level changes.
The purpose of this study was to quantitatively investigate interfacial stress and stress distribution in implant bone in 2 implant abutment designs (platform-switched design and conventional diameter matching) by using a nonlinear finite element analysis method.
A finite element simulation study was applied to 2 commercially available dental implant systems: the Ankylos implant system with a reduced-diameter abutment (platform-switched implant) and the Anthogyr implant system with an abutment of the same diameter (regular platform implant). These 2 dental implant systems were positioned in a bone block, which was constructed based on a cross-sectional image of a human mandible in the molar region. In simulation, a single vertical load of 50 N, 100 N, or 150 N and horizontal loads of 50 N and 100 N were applied to the occlusal surface of the abutment.
The finite element analysis found that the Ankylos implant system has a higher maximum von Mises stress in the implant abutment connection section and a lower maximum von Mises stress in the periimplant bone. The opposite results were found in the Anthogyr implant system.
Lower stress levels in the periimplant bone with a more uniform stress distribution were found for the Ankylos implant system with a platform-switched configuration. Although relatively higher stress was found in the abutment, premature implant failure is not anticipated because of the high strength of titanium alloy.
具有平台转换配置的牙种植体系统是否具有更好的种植体周围骨应力分布并导致更少的种植体周围骨水平变化尚不清楚。
本研究的目的是通过使用非线性有限元分析方法，定量研究两种种植体基台设计（平台转换设计和传统直径匹配）中种植体-骨界面的应力和应力分布。
对两种市售牙种植体系统进行有限元模拟研究：具有减小直径基台的Ankylos种植体系统（平台转换种植体）和具有相同直径基台的Anthogyr种植体系统（常规平台种植体）。将这两种牙种植体系统植入基于人类下颌磨牙区域横截面图像构建的骨块中。在模拟中，在基台的咬合面上施加50 N、100 N或150 N的单个垂直载荷以及50 N和100 N的水平载荷。
有限元分析发现，Ankylos种植体系统在种植体-基台连接部分具有较高的最大von Mises应力，而在种植体周围骨中具有较低的最大von Mises应力。在Anthogyr种植体系统中发现了相反的结果。
对于具有平台转换配置的Ankylos种植体系统，种植体周围骨中的应力水平较低，应力分布更均匀。尽管在基台中发现相对较高的应力，但由于钛合金的高强度，预计不会出现种植体过早失败的情况。
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