Satpathy Megha, Duan Yuanyuan, Betts Logan, Priddy Matthew, Griggs Jason A
Department of Biomedical Materials Science, University of Mississippi Medical Centre, Jackson, MS, USA.
Department of Mechanical Engineering, Mississippi State University, Starkville, MS, USA.
J Dent Oral Epidemiol. 2022;2(1). doi: 10.54289/jdoe2200102. Epub 2022 Mar 9.
To evaluate the effect of bone remodelling around a reduced-diameter dental implant on its fatigue limit using finite element analysis (FEA).
A dental implant assembly, which included a reduced-diameter dental implant (Biomet-3i external hex), an abutment (GingiHue) and a connector screw (Gold-Tite Square screw), was scanned using micro-computed tomography (Skyscan 1172). Its dimensions were measured using Mimics (Materialise) and an optical microscope (Keyence). The digital replicas of the physical specimens were constructed using SOLIDWORKS (Dassault Systems). A cylindrical bone specimen holder with two layers (cortical and cancellous bone) was designed in SOLIDWORKS. Two assemblies were created: (a) Model 1: Having non-remodelled bone; (b) Model 2: Cancellous bone remodelled at the regions adjacent to the implant screw threads. FEA was performed in ABAQUS (SIMULIA). In Model 1, the Young's modulus of cortical and cancellous bone were 20 GPa and 14 GPa, respectively. For Model 2, the region of the cancellous bone adjacent to the implant screw threads was assigned a Young's modulus of 20 GPa. fe-safe (SIMULIA) was used to estimate the fatigue limit.
The maximum von Mises stress under 100 N load was 439.9 MPa for both models 1 and 2 and was located at the connector screw. The fatigue limit was 116.4 N for both models 1 and 2.
The results suggest that implant fatigue resistance tested according to ISO 14801 may be accurately predicted without bothering to simulate the non-homogeneous stiffness that occurs at the bone-implant interface in the clinical case.
使用有限元分析（FEA）评估直径减小的牙科种植体周围骨重塑对其疲劳极限的影响。
使用微型计算机断层扫描（Skyscan 1172）扫描一个牙科种植体组件，该组件包括一个直径减小的牙科种植体（Biomet-3i外六角）、一个基台（GingiHue）和一个连接螺钉（Gold-Tite方形螺钉）。使用Mimics（Materialise）和光学显微镜（基恩士）测量其尺寸。使用SOLIDWORKS（达索系统）构建物理标本的数字复制品。在SOLIDWORKS中设计了一个带有两层（皮质骨和松质骨）的圆柱形骨标本支架。创建了两个组件：（a）模型1：具有未重塑的骨；（b）模型2：种植体螺纹相邻区域的松质骨进行了重塑。在ABAQUS（SIMULIA）中进行有限元分析。在模型1中，皮质骨和松质骨的杨氏模量分别为20 GPa和14 GPa。对于模型2，种植体螺纹相邻的松质骨区域被赋予20 GPa的杨氏模量。使用fe-safe（SIMULIA）估计疲劳极限。
模型1和模型2在100 N载荷下的最大冯·米塞斯应力均为439.9 MPa，位于连接螺钉处。模型1和模型2的疲劳极限均为116.4 N。
结果表明，根据ISO 14801测试的种植体抗疲劳性可以准确预测，而无需费心模拟临床病例中骨-种植体界面出现的非均匀刚度。
