Relationship between the metallurgical structure of experimental titanium miniscrew implants and their torsional properties

Takeshi Muguruma, Masahiro Iijima, William A. Brantley, Toshihiro Yuasa, Hiroki Ohno, Itaru Mizoguchi

研究成果: Article査読

4 被引用数 (Scopus)

抄録

The aims of this study were to investigate the torsional properties of three experimental titanium miniscrew implants for orthodontic anchorage and to determine the relationship between the torsional properties and metallurgical structures.Experimental miniscrew implants with a diameter of 1.4 mm were fabricated from commercially pure (CP) titanium (alpha-titanium), Ti-4Al-4V (duplex alpha-beta-titanium), and Ti-33Nb-15Ta-6Zr (beta-titanium). Micro-X-ray diffraction (XRD) was performed to identify phases, and microstructures of etched cross-sections were obtained with scanning electron microscopy (SEM). Implants were loaded in torsion (n=5), and mean moments and twist angles at fracture were statistically compared using the Kruskal-Wallis and Mann-Whitney U-tests. Cyclic torsional moment for fracture of starting square wires (2×2×30 mm) was measured (n=3).At fracture, the Ti-4Al-4V and Ti-33Nb-15Ta-6Zr implants demonstrated significantly higher mean torque than the CP titanium implant, while the Ti-33Nb-15Ta-6Zr implant had a significantly higher mean twist angle than the other two implants. The CP titanium and Ti-33Nb-15Ta-6Zr implants displayed good fatigue performance and excellent ductility. Ti-33Nb-15Ta-6Zr beta-titanium alloy is suitable for manufacturing miniscrew implants since it has excellent torsional properties.

本文言語English
ページ(範囲)293-297
ページ数5
ジャーナルEuropean Journal of Orthodontics
33
3
DOI
出版ステータスPublished - 2011 6
外部発表はい

ASJC Scopus subject areas

  • 歯科矯正学

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