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    Comparative biomechanical analysis of titanium fixation plates and NiTi shape memory staples for mandibular fracture treatment using finite element method
    (Elsevier Sci Ltd, 2025) Dundar, Mehmet Akif; Gunoz, Alper; Kepir, Yusuf; Kara, Memduh; Avci, Ahmet; Arbag, Hamdi
    Mandibular fractures are common injuries that require effective treatment to restore proper function and aesthetics. While titanium fixation plates are widely used for mandibular fracture fixation, Nickel-Titanium (NiTi) shape memory staples offer potential advantages in terms of biocompatibility and adaptation to bone contours. NiTi alloys possess unique properties like shape memory and superelasticity, enabling them to return to their original shape after deformation through heating or load release. This study employs finite element analysis (FEA) to compare the biomechanical performance of titanium fixation plates and NiTi shape memory staples in treating mandibular fractures under simulated masticatory loading conditions. A 3D model of a human mandible was developed, and fractures were simulated with varying configurations of fixation plates and shape memory staples. A 200 N load, representing bite force, was applied to the incisor region, and the resulting stress distributions and displacements were analyzed. Results indicated that while both fixation methods effectively stabilized the fracture, shape memory staples exhibited lower stress concentrations compared to plates, particularly when utilizing a three-staple configuration with strategically angled placement. NiTi shape memory staples may offer a biomechanically advantageous alternative to titanium plates for mandibular fracture treatment, warranting further clinical investigation regarding long-term outcomes including bone remodeling and healing. This study demonstrates that NiTi shape memory staples are a viable alternative to traditional titanium fixation plates for mandibular fracture treatment, potentially leading to improved clinical outcomes and patient comfort.
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    Influence of hydrothermal conditions on the mechanical properties of hybrid composite pipes
    (Sage Publications Ltd, 2024) Kepir, Yusuf; Kara, Memduh
    Composite materials are becoming widespread in many sectors today, especially in the defence and space industry. Composite materials can be exposed to significant temperature changes and various environmental conditions depending on their usage areas. Therefore, composite materials with high resistance to high temperatures and harsh environmental conditions are being studied today. In this study, four types of 6-layer composite pipes with glass/glass/glass, basalt/basalt/basalt, glass/basalt/glass and basalt/glass/basalt stacking sequences were fabricated with filament wound method. In order to simulate the behavior of composite materials under environmental conditions, specimens were subjected to hydrothermal aging in pure water at 70 degrees C for three different periods of 500, 1000 and 1500 hours. During the aging process, the mass changes of the pipes were measured regularly, and the water absorption behavior was determined with reference to ASTM D5229 standard. Hardness tests were carried out with Rockwell hardness tester based on ASTM D785 standard. As a result of the study, it was determined that the mechanical performance of hybrid specimens was higher than that of non-hybrid specimens. It was observed that the hydrothermal aging process caused a loss of mechanical strength in all specimens. It was concluded that the hybrid composite specimen with basalt/glass/basalt stacking order had the highest resistance to hydrothermal aging.