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<p>In this research, prototypes of orthopedic implants of bone staple and bone plate types manufactured from Ti-25Nb-based superelastic SMA were developed and experimentally characterized. The proposed implants combine the benefits of shape memory alloys—such as active behavior, a lower elastic modulus, and excellent corrosion resistance—while eliminating the health risks associated with the nickel content in conventional Nitinol SMAs. Heat-treated Ti-25Nb-based SMA samples proved to be biocompatible through tests for in vitro cytotoxicity. Mechanical characterization under different isotherms of Ti-25Nb-based SMA revealed a low influence of test temperature on phase transformation stresses and a trend of convergence of Young’s moduli with increasing temperature. The evaluation of the cyclic mechanical behavior at human body temperature, and under different isotherms according to the ASTM standards, revealed the stability of the functional properties of these implants, ensuring safety for the orthopedic surgeon during the positioning and fixation of the bone fragments.</p>

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Ti-25Nb-Based Superelastic SMA Bone Staples and Plates: Manufacturing, Mechanical Behavior, and In Vitro Cytotoxicity Evaluation

  • 期刊论文

  • 发表日期：

    2025年5月14日

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  • Diego Jean Freitas Vieira Novais,
  • Paulo César Sales da Silva,
  • Estephanie Nobre Dantas Grassi,
  • Marcus Vinicius Lia Fook,
  • Carlos José de Araújo

摘要

In this research, prototypes of orthopedic implants of bone staple and bone plate types manufactured from Ti-25Nb-based superelastic SMA were developed and experimentally characterized. The proposed implants combine the benefits of shape memory alloys—such as active behavior, a lower elastic modulus, and excellent corrosion resistance—while eliminating the health risks associated with the nickel content in conventional Nitinol SMAs. Heat-treated Ti-25Nb-based SMA samples proved to be biocompatible through tests for in vitro cytotoxicity. Mechanical characterization under different isotherms of Ti-25Nb-based SMA revealed a low influence of test temperature on phase transformation stresses and a trend of convergence of Young’s moduli with increasing temperature. The evaluation of the cyclic mechanical behavior at human body temperature, and under different isotherms according to the ASTM standards, revealed the stability of the functional properties of these implants, ensuring safety for the orthopedic surgeon during the positioning and fixation of the bone fragments.