Department of Continuum Mechanics and Structural Analysis, Carlos III University, Madrid, Spain.
Research Department, ASISA Dental, Madrid, Spain.
Med Biol Eng Comput. 2018 Dec;56(12):2233-2244. doi: 10.1007/s11517-018-1846-8. Epub 2018 Jun 11.
The aim of this study was to fully characterize the mechanical behavior of an external hexagonal implant connection (ø3.5 mm, 10-mm length) with an in vitro study, a three-dimensional finite element analysis, and a probabilistic fatigue study. Ten implant-abutment assemblies were randomly divided into two groups, five were subjected to a fracture test to obtain the maximum fracture load, and the remaining were exposed to a fatigue test with 360,000 cycles of 150 ± 10 N. After mechanical cycling, all samples were attached to the torque-testing machine and the removal torque was measured in Newton centimeters. A finite element analysis (FEA) was then executed in ANSYS® to verify all results obtained in the mechanical tests. Finally, due to the randomness of the fatigue phenomenon, a probabilistic fatigue model was computed to obtain the probability of failure associated with each cycle load. FEA demonstrated that the fracture corresponded with a maximum stress of 2454 MPa obtained in the in vitro fracture test. Mean life was verified by the three methods. Results obtained by the FEA, the in vitro test, and the probabilistic approaches were in accordance. Under these conditions, no mechanical etiology failure is expected to occur up to 100,000 cycles. Graphical abstract ᅟ.
本研究的目的是通过体外研究、三维有限元分析和概率疲劳研究，全面描述外部六方种植体连接（ø3.5mm，10mm 长）的力学行为。将 10 个种植体-基台组件随机分为两组，其中 5 个进行断裂试验以获得最大断裂载荷，其余的进行 360,000 次 150±10N 的疲劳试验。机械循环后，所有样本均连接到扭矩试验机上，并以牛顿厘米为单位测量去除扭矩。然后在 ANSYS®中执行有限元分析（FEA），以验证机械试验中获得的所有结果。最后，由于疲劳现象的随机性，计算了概率疲劳模型，以获得与每个循环载荷相关的失效概率。FEA 表明，断裂与体外断裂试验中获得的最大 2454MPa 应力相对应。三种方法均验证了平均寿命。FEA、体外试验和概率方法的结果一致。在这些条件下，预计在 100,000 次循环内不会发生机械病因失效。ᅟ.
