Ding Xi, Liao Sheng-Hui, Zhu Xing-Hao, Wang Hui-Ming
Department of Stomatology, First Affiliated Hospital of Wenzhou Medical University, Wenzhou 325000, China.
School of Information Science and Engineering, Central South University, Changsha 410083, China.
Biomed Res Int. 2014;2014:709398. doi: 10.1155/2014/709398. Epub 2014 Nov 3.
The study was to investigate the impact of orthotropic material on the biomechanics of dental implant, based on a detailed mandible with high geometric and mechanical similarity.
Multiple data sources were used to elaborate detailed biological structures and implant CAD models. In addition, an extended orthotropic material assignment methodology based on harmonic fields was used to handle the alveolar ridge region to generate compatible orthotropic fields. The influence of orthotropic material was compared with the commonly used isotropic model and simplified orthotropic model.
The simulation results showed that the values of stress and strain on the implant-bone interface almost increased in the orthotropic model compared to the isotropic case, especially for the cancellous bone. However, the local stress concentration was more obvious in the isotropic case compared to that in orthotropic case. The simple orthotropic model revealed irregular stress and strain distribution, compared to the isotropic model and the real orthotropic model. The influence of orthotropy was little on the implant, periodontal ligament, tooth enamel, and dentin.
The orthotropic material has significant effect on stress and strain of implant-bone interface in the mandible, compared with the isotropic simulation. Real orthotropic mechanical properties of mandible should be emphasized in biomechanical studies of dental implants.
本研究旨在基于具有高度几何和力学相似性的详细下颌骨，研究正交各向异性材料对牙种植体生物力学的影响。
使用多个数据源来详细阐述生物结构和种植体CAD模型。此外，采用基于调和场的扩展正交各向异性材料赋值方法来处理牙槽嵴区域，以生成兼容的正交各向异性场。将正交各向异性材料的影响与常用的各向同性模型和简化正交各向异性模型进行比较。
模拟结果表明，与各向同性情况相比，正交各向异性模型中种植体-骨界面上的应力和应变值几乎均有所增加，尤其是对于松质骨。然而，与正交各向异性情况相比，各向同性情况下的局部应力集中更为明显。与各向同性模型和真实正交各向异性模型相比，简化正交各向异性模型显示出不规则的应力和应变分布。正交各向异性对种植体、牙周韧带、牙釉质和牙本质的影响较小。
与各向同性模拟相比，正交各向异性材料对下颌骨种植体-骨界面的应力和应变有显著影响。在牙种植体的生物力学研究中应强调下颌骨的真实正交各向异性力学性能。
