Mechanical properties and cyto-toxicity of newly designed β type Ti alloys for dental applications

Toshikazu Akahori, Mitsuo Niinomi, Masaaki Harada, Junji Takeda, Hiroyuki Toda, Sigeki Katsura, Tsutomu Takeuchi, Hisao Fukui

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Abstract

Ti-29Nb-13Zr-2Cr, Ti-29Nb-15Zr-1.5Fe, Ti-29Nb-10Zr-0.5Si, Ti-29Nb-10Zr-0.5Cr-0.5Fe and Ti-29Nb-18Zr-2Cr-0.5Si were newly designed for dental applications. These alloys were designed based on Ti-29Nb-13Ta-4.6Zr (TNTZ), replacing relatively high melting point element, Ta, with beta stabilizing elements such as Cr, Fe and Si, which would lower the melting point of the alloy. Their melting points, mechanical properties, and cytotoxicity were investigated in this study. The following results were obtained. Melting points of designed alloys decrease about 50 to 370 K as compared with that of TNTZ, and Ti-29Nb-13Zr-2Cr has the lowest melting point around 2050 K. Vickers hardness of the surface of each designed alloy cast into modified magnesia based investment material is in the range of 400HV to 500HV, which is lower than that of TNTZ (around 560HV). Balances of the strength and the ductility of Ti-29Nb-13Zr-2Cr, Ti-29Nb-15Zr-1.5Fe and Ti-29Nb-10Zr-0.5Cr-0.5Fe are nearly equal to those of TNTZ. Cell viability of each designed alloy is excellent.

Original languageEnglish
Pages (from-to)96-102
Number of pages7
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume69
Issue number1
DOIs
Publication statusPublished - Jan 1 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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