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Acid-induced bioactive titania surface.

Xiaobing Zhao1, Xuanyong Liu, Chuanxian Ding

  • 1Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People's Republic of China.

Journal of Biomedical Materials Research. Part A
|August 27, 2005
PubMed
Summary
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Acid treatment enhances the bioactivity of plasma-sprayed titania coatings on titanium alloy. This improvement in bioactivity is independent of the TiO(2) powder

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Surface Chemistry

Background:

  • Titanium alloys are widely used in biomedical implants.
  • Enhancing the bioactivity of titanium implants is crucial for osseointegration.
  • Plasma-sprayed titania coatings offer a promising approach to improve implant biocompatibility.

Purpose of the Study:

  • To investigate the effect of acid treatment on the bioactivity of nano- and conventional-TiO(2) coatings.
  • To determine if particle size or phase composition influences the bioactivity of titania coatings.
  • To evaluate the formation of hydroxyapatite on treated and untreated titania surfaces.

Main Methods:

  • Atmospheric plasma spraying of nano- and conventional-TiO(2) powders onto titanium alloy.

Related Experiment Videos

  • Acid treatment of as-sprayed coatings using H(2)SO(4) and HCl solutions.
  • Bioactivity evaluation using simulated body fluid (SBF) immersion tests.
  • Surface characterization using X-ray diffraction (XRD).

    • Main Results:

    • As-sprayed coatings consisted primarily of rutile, with minor amounts of anatase and Ti(3)O(5).
    • Acid treatment of both nano- and conventional-titania coatings induced hydroxyapatite formation in SBF.
    • Untreated coatings did not exhibit hydroxyapatite formation.
    • Surface roughness was greater for conventional powder coatings compared to nanopowder coatings.

    Conclusions:

    • Acid treatment significantly improves the bioactivity of plasma-sprayed titania coatings.
    • The bioactivity enhancement is independent of the initial TiO(2) particle size and phase composition.
    • Acid treatment is a key factor in promoting hydroxyapatite nucleation for enhanced osseointegration.