Study of biocompatible implant TiNbSn alloy

2023 Fiscal Year Final Research Report

• Project/Area Number: 20H02458
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Tohoku University
• Principal Investigator: Masahashi Naoya 東北大学, 金属材料研究所, 教授 (20312639)
• Co-Investigator(Kenkyū-buntansha): 森 優 東北大学, 大学病院, 講師 (70634541)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 生体材料 / 陽極酸化 / トライボコロージョン特性 / 電気化学 / 二酸化チタン / 密着強度 / 硬度 / 結晶性

Outline of Final Research Achievements

In order to suppress the elution of wear particles and metal ions generated from implant materials, a newly developed biomedical TiNbSn alloy was anodized under high voltage application, and its tribocorrosion properties were compared with that of pure Ti in simulated body fluids. Spark discharge did not occur in pure Ti anodization, but occurred due to dielectric breakdown in TiNbSn, and the ctystal structure of the formed oxide of the former and latter was anatase and rutile TiO2, respectively. Regarding tribocorrosion characteristics, the friction coefficient of the latter was similar to the former, but a negative voltage shift of OCP was observed in the former, but not in the latter. It was concluded that the superior functionality of the latter was due to the strongly bonded, high-strength rutile TiO2, which suppressed the generation of wear particles and the elution of metal ions.

Free Research Field

金属材料学

Academic Significance and Societal Importance of the Research Achievements

金属系インプラント材料は骨伝導性を有しないために生体適合性に劣るだけでなく、最近需要が激増している人工股関節は異なる材料の集合体であるため、摩擦摩耗により発生する摩耗粉や金属イオンの溶出による疾患が懸念されている。申請者グループはこれらの課題を陽極酸化による表面処理で解決し、安全安心なインプラント治療を提供することに成功した。