Institute of Solid Mechanics, Mechatronics and Biomechanics, Faculty of Mechanical Engineering, Brno University of Technology, Brno, Czech Republic.
Department of Oral and Maxillofacial Surgery/Oral Pathology and 3D Innovation Lab, VU University Medical Center, Amsterdam, The Netherlands.
Comput Biol Med. 2018 May 1;96:157-165. doi: 10.1016/j.compbiomed.2018.03.012. Epub 2018 Mar 17.
Osseointegration is paramount for the longevity of dental implants and is significantly influenced by biomechanical stimuli. The aim of the present study was to assess the micro-strain and displacement induced by loaded dental implants at different stages of osseointegration using finite element analysis (FEA). Computational models of two mandible segments with different trabecular densities were constructed using microCT data. Three different implant loading directions and two osseointegration stages were considered in the stress-strain analysis of the bone-implant assembly. The bony segments were analyzed using two approaches. The first approach was based on Mechanostat strain intervals and the second approach was based on tensile/compression yield strains. The results of this study revealed that bone surrounding dental implants is critically strained in cases when only a partial osseointegration is present and when an implant is loaded by buccolingual forces. In such cases, implants also encounter high stresses. Displacements of partially-osseointegrated implant are significantly larger than those of fully-osseointegrated implants. It can be concluded that the partial osseointegration is a potential risk in terms of implant longevity.
骨整合对于种植牙的长期使用至关重要，并且受到生物力学刺激的显著影响。本研究的目的是使用有限元分析（FEA）评估在不同骨整合阶段加载的种植牙引起的微应变和位移。使用 microCT 数据构建了两个具有不同小梁密度的下颌骨段的计算模型。在骨-种植体组件的应力-应变分析中考虑了三种不同的种植体加载方向和两个骨整合阶段。对骨段进行了两种方法的分析。第一种方法基于Mechanostat 应变间隔，第二种方法基于拉伸/压缩屈服应变。研究结果表明，当仅存在部分骨整合并且当种植体受到颊舌向力加载时，种植牙周围的骨骼会受到严重的应变。在这种情况下，种植体也会承受高应力。部分骨整合种植体的位移明显大于完全骨整合种植体的位移。可以得出结论，部分骨整合在植入物的长期使用方面是一个潜在的风险。
