Biomechanical behavior of modular acetabular cups made of poly-ether-ether-ketone: A finite element study

2018 ◽  
Vol 232 (10) ◽  
pp. 1030-1038 ◽  
Author(s):  
Danny Vogel ◽  
Christian Schulze ◽  
Henry Dempwolf ◽  
Daniel Kluess ◽  
Rainer Bader
Keyword(s):  
Finite Element ◽  
Carbon Fibers ◽  
Numerical Study ◽  
Shell Material ◽  
Shell Deformation ◽  
Press Fit ◽  
Ether Ether Ketone ◽  
Carbon Fiber Material ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone

After total hip arthroplasty, stress-shielding is a potential risk factor for aseptic loosening of acetabular cups made of metals. This might be avoided by the use of acetabular cups made of implant materials with lower stiffness. The purpose of this numerical study was to determine whether a modular acetabular cup with a shell made of poly-ether-ether-ketone or poly-ether-ether-ketone reinforced with carbon fibers might be an alternative to conventional metallic shells. Therefore, the press-fit implantation of modular cups with shells made of different materials (Ti6Al4V, poly-ether-ether-ketone, and poly-ether-ether-ketone reinforced with carbon fibers) and varying liner materials (ceramics and ultra-high-molecular-weight polyethylene) into an artificial bone cavity was simulated using finite element analysis. The shell material had a major impact on the radial shell deformation determined at the rim of the shell, ranging from 17.9 µm for titanium over 92.2 µm for poly-ether-ether-ketone reinforced with carbon fibers up to 475.9 µm for poly-ether-ether-ketone. Larger radial liner deformations (up to 618.4 µm) occurred in combination with the shells made of poly-ether-ether-ketone compared to titanium and poly-ether-ether-ketone reinforced with carbon fibers. Hence, it can be stated that conventional poly-ether-ether-ketone is not a suitable shell material for modular acetabular cups. However, the radial shell deformation can be reduced if the poly-ether-ether-ketone reinforced with carbon fiber material is used, while deformation of ceramic liners is similar to the deformation in combination with titanium shells.

scholarly journals Biomechanical Effect of Various Tibial Bearing Materials in Uni-Compartmental Knee Arthroplasty Using Finite Element Analysis

2020 ◽  
Vol 10 (18) ◽  
pp. 6487
Author(s):  
Yoon Hae Kwak ◽  
Hyoung-Taek Hong ◽  
Yong-Gon Koh ◽  
Kyoung-Tak Kang
Keyword(s):  
Finite Element ◽  
Contact Stress ◽  
Lateral Meniscus ◽  
Good Method ◽  
Normal Walking ◽  
Element Analysis ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Bearing Materials ◽  
Ether Ketone

This paper aimed to evaluate the biomechanical effects of tibial bearing materials, from ultra-high-molecular-weight polyethylene (UHMWPE) to poly-ether-ether-ketone (PEEK) and carbon-fiber-reinforced poly-ether-ether-ketone (CFR-PEEK). The studies were conducted based on a validated finite element model. The geometry of the intact knee model was developed from computed tomography and magnetic resonance imaging of the left knee joint of a 37-year-old healthy male volunteer. Three different loading conditions, related to the loads applied in the experimental research, were applied to this study for model predictions and validation. The contact stress in the other compartments was under normal walking conditions. Also, stresses on five regions of the tibia bone were analyzed under normal walking conditions. The lowest contact stress between the lateral meniscus and tibial cartilage was achieved in the order of the use of CFR-PEEK, PEEK, and UHMWPE tibial bearings. Moreover, CFR-PEEK and PEEK tibial bearings indicated lower and greater stresses on cortical and trabecular bones, respectively, compared to the UHMWPE tibial bearing. These results show that CFR-PEEK can be used as a tibial bearing material as an alternative to UHMWPE, and such a change in the material may be a good method for reducing potential anteromedial pain.

The effect of composite bonding spot size and location on the performance of poly-ether-ether-ketone (PEEK) retainer wires

2021 ◽  
Vol 33 (2) ◽  
pp. 1-9
Author(s):  
Ammar S Kadhum ◽  
Akram F Alhuwaizi
Keyword(s):  
Finite Element ◽  
Spot Size ◽  
Linear Displacement ◽  
Von Mises Stress ◽  
Basic Model ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Safe Limits ◽  
Ether Ketone ◽  
The Wire

Background: Poly-ether-ether-ketone(PEEK) has been introduced to many dental fields. Recently it was tested as a retainer wire‎ following orthodontic treatment. This study aimed to investigate the effect of changing the bonding spot size and location on the performance of PEEK retainer wires. Methods: A biomechanical study involving four three-dimensional finite element models was performed. The basic model was with a 0.8 mm cylindrical cross-section PEEK wire, bonded at the center of the lingual surface of the mandibular incisors with 4 mm in diameter composite spots. Two other models were designed with 3 mm and 5 mm composite sizes. The last model was created with the composite bonding spot of the canine away from the center of the crown, closer to the lateral incisor. The linear displacement of the teeth, strains of the periodontal ligament, and stresses in PEEK wire and composite were evaluated. The data was numerically produced with color coded display by the software. Selected values were tabulated and compared among models. Results: The amount of linear displacement and strain was very low. Stresses in the wire and composite were affected by the size and position of the composite bonding spot. The safe limits were identified at 235 MPa for PEEK and 100 MPa for composite. The basic model had a von Mises stress in the PEEK wire of 122.09 MPa, and a maximum principal stress in the composite of 99.779 MPa. Both stresses were within the safe limits, which means a lower risk of failure in PEEK and composite. All other models had stresses that exceeded the safe limit of the composite. The 3 mm composite model was the only one that developed stresses in the wire more than the safe limits of PEEK. Conclusions: Within the limitations of this study, bonding PEEK wires with 4 mm bonding spots to the clinical crown center provided the best mechanical performance of the wires and spots; otherwise, the mechanical properties of the wire and composite would be affected and, therefore, might affect the retention process. Keywords: Retention, PEEK, Finite element analysis

Improvement in the mechanical and friction performance of poly(ether ether ketone) composites by addition of modificatory short carbon fibers and zinc oxide

2017 ◽  
Vol 30 (6) ◽  
pp. 643-656 ◽  
Author(s):  
Ying Hu ◽  
Xiaochen Hou ◽  
Xiyu Hu ◽  
Dong Jiang
Keyword(s):  
Zinc Oxide ◽  
Carbon Fibers ◽  
Zno Nanoparticles ◽  
Mechanical And Thermal Properties ◽  
Morphological Examination ◽  
Ether Ether Ketone ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone ◽  
Friction Performance ◽  
Short Carbon

The composites of poly(ether ether ketone) (PEEK) with zinc oxide (ZnO) nanoparticles and short carbon fibers (SCFs) were produced with twin-screw extruder. ZnO nanoparticles were modified by γ-aminopropyl triethoxyl silane (APTES), and SCFs were wrapped with poly(ether sulfone) (PES). Morphological examination showed that the modified ZnO (m-ZnO) nanoparticles and wrapped SCFs (w-SCFs) were well dispersed in PEEK. The tribological behavior of PEEK composites under dry friction conditions was studied using a universal micro-tribotester. Exhaustive experimental results showed that the tribological behaviors, or the mechanical and thermal properties of the composites after the addition of m-ZnO nanoparticles and w-SCFs, were improved. The tribological properties of PEEK/ZnO/SCFs composites with 5.0 wt% functionalized ZnO and 10.0 wt% w-SCFs are the minimum.

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