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    A custom-made novel design for temporomandibular joint prosthesis using finite element method: Self-pinned TMJ prosthesis
    (Sage Publications Ltd, 2025) Kose, Sinan; Sofuoglu, Hasan
    This study demonstrates a new self-pinned temporomandibular joint (TMJ) prosthesis by reducing the load on the bone and, hence, tissue damage. In this new customized model, a 3D model of the intact mandibula was obtained by means of computer-aided design (CAD) using computed tomography (CT) scan images of a 34-year-old man and then investigated using the finite element method (FEM). The self-pinned TMJ prosthesis with fewer screws was mounted on the broken mandibula (lower jawbone) to create the implanted mandibula, which was then analyzed numerically via FEM. A number of different self-pinned TMJ prosthesis models were also created, and their functional performances under physiological loading were investigated to obtain ideal pin-screw structures. Moreover, alternative prosthetic fixation studies have also been carried out to facilitate surgeons in fixing the self-pinned TMJ prosthesis to the chin. The self-pinned TMJ prosthesis (P2BH-C) developed in the present study has led to a great reduction in stresses, which were well within elastic limits for all prosthetic components compared to the commercial prosthetic model. The developed prosthesis was able to reduce hard and soft tissue damage, which can provide surgeons with a more comfortable and controlled range of motion to avoid damaging the nerves.
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    Investigation of the mechanical and physical properties of mesoporous silicon dioxide fillet epoxy composites
    (Elsevier, 2024) Kose, Sinan
    In this study, the effect of mesoporous silicon dioxide (M-SiO2) additives with different surface areas and pore diameters on the morphological and mechanical properties of epoxy composites was investigated. For this purpose, M-SiO2 particles with different pore diameters and surface areas were synthesized from polyethylene glycol (PEG) with three different molecular weights (PEG2000 (PEG2), PEG6000 (PEG6), and PEG35000 (PEG35) kDa) using the one-step sol-gel technique. The mixing of epoxy resin, hardener and M-SiO2 fillers, was carried out in a mould followed by using ultrasonic bath and mechanical stirrer. The mechanical properties of the composites, including hardness, tensile strength, elongation at break, and modulus of elasticity, were studied. FT-IR spectra and XRD patterns show that M-SiO2 is distributed homogeneously in the epoxy. The epoxy/PEG35M-SiO2 composites' tensile strength (8.7%) and modulus of elasticity (23.3%) increased with the addition of PEG35M-SiO2, however their elongation at break (5.1%) decreased.
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    Investigation of the mechanical and tribological properties of aluminum powder filled with cyclo-olefin-copolymer composites
    (Elsevier, 2024) Kose, Sinan
    In this study, the changes on the mechanical and tribological properties of cyclo-olefin-copolymer (COC) composites with the addition different concentrations of aluminum (Al) powder. For this purpose, Al powder at 15 %, 25 %, 35 % and 45 % concentrations by weight were added to COC composites using extrusion and injection molding methods. The mechanical properties of the generated composites, including hardness, tensile strength, elongation at break, and modulus of elasticity, as well as their tribological properties such as friction coefficient and wear rate, were studied. Friction and wear experiments were carried out under dry ambient conditions using a pin-on-disc system (pin-disc), with 20-40-60 N loads and 0.5-1.0-1.5 m/s sliding speeds. The incorporation of 45 wt% Al powders increased the tensile strength (10.6 %) and modulus of elasticity (57.8 %), while decreasing the elongation at break (97.8 %) values of COC/Al composites. The friction coefficient (FoC) of COC polymer and Al powder-filled COC composites decreased due to increasing sliding speed and load, which led to an increase in wear rate (WR). The lowest FoC and WR were obtained in a 45 % Al-filled COC composite. The FoC decreased while the WR increased with applied loads and sliding speeds. The FoC and WR both fell by 151.7 % and 100.9 %, respectively, with the addition of the 45 % Al powder to the COC polymer.
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    The effect of modified waste fish bone on mechanical and tribological properties of epoxy composites
    (Elsevier, 2025) Kose, Sinan; Ulusal, Fatma; Yetgin, Salih Hakan
    A significant amount of fish waste is generated every day worldwide and discharged in large quantities in markets, causing environmental and hygiene problems. Therefore, this study aimed to produce environmentally friendly composite materials with improved mechanical and tribological properties in which waste is utilized. For this purpose, this work investigated the production, characterization, mechanical and tribological performance of surface-modified and unmodified waste fish bone (originated from Rainbow trout) powder-reinforced epoxy composites. Interfacial interaction between the waste fish bone powder and epoxy was investigated by Fourier-transform infrared spectroscopy (FT-IR) and Scanning electron Microscopy (SEM). It was found that the contents of fish bone powder obtained from fish filleting waste affect the mechanical properties and tribological behaviour of epoxy composites. The tensile and flexural strengths of the composites containing fish bone powder improved by 20.6 % and 47.0 %, respectively, compared to the unfilled epoxy as an effect of the thermal treatment. In addition, the coefficient of friction experienced a decrease of 45.8 %, while wear resistance was improved by 34.6 %.