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Reduction in nickel content of the surface oxide layer on Ni-Ti alloy by electrolytic treatment.

Purpose: Ni-Ti alloy has been increasingly applied to dental and medical devices, however, it contains nickel, which is known to have adverse effects on the human body. The purpose of this study was to form a nickel-free surface oxide layer on Ni-Ti alloy by electrolytic treatment for better biocomp...

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Published in:Journal of Oral Science Vol. 63; no. 1; pp. 50 - 54
Main Authors: Takayuki Yoneyama, Takao Hanawa, Yoneyama, Takayuki, Hanawa, Takao
Format: research tables/charts Journal Article
Published: Nihon University School of Dentistry 2021
Online Access:View this record in EBSCOhost
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        13434934
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      jtl: Journal of Oral Science
      issn: 13434934
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    pubinfo:
      dt: 2021
      vid: 63
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      pid: 21024
      pub: Nihon University School of Dentistry
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        147799231
        147799231
        NLM33177275
        147799231
        10.2334/josnusd.20-0239
        NLM33177275
        147799231
      ppf: 50
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        atl: Reduction in nickel content of the surface oxide layer on Ni-Ti alloy by electrolytic treatment.
      aug:
        au:
          Takayuki Yoneyama
          Takao Hanawa
          Yoneyama, Takayuki
          Hanawa, Takao
        affil: Department of Dental Materials, Nihon University School of Dentistry, Tokyo, Japan
      sug:
        subj:
          Nickel
          Titanium
          Surface Properties
          Oxides
          Materials Testing
          Alloys
          Human
      ab: Purpose: Ni-Ti alloy has been increasingly applied to dental and medical devices, however, it contains nickel, which is known to have adverse effects on the human body. The purpose of this study was to form a nickel-free surface oxide layer on Ni-Ti alloy by electrolytic treatment for better biocompatibility.Methods: Ni-49.15Ti (mol%) alloy was used, and the electrolytic treatment was performed in the electrolytes under 50 V for 30 minutes. The electrolytes were composed of lactic acid, water, and glycerol with different compositions. Surface analysis and characterization of Ni-Ti alloy were carried out by means of X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES).Results: Results indicated that the outmost surface oxide layer was nickel-free when using an electrolyte comprising 7.1% lactic acid, 57.2% water, and 35.7% glycerol by volume. The composition of this nickel-free surface oxide layer was determined as TiO1.92(OH)1.35 ∙ 0.43H2O by XPS, similar to that of unalloyed titanium. The thickness of this nickel-free layer was estimated at 6.4 nm by AES.Conclusion: The nickel-free surface oxide layer produced on Ni-Ti alloy is considered to improve the biocompatibility of medical and dental devices having shape memory effect and/or super-elasticity.
      pubtype: Academic Journal
      doctype:
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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