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Related Experiment Videos

Dissolution behavior of plasma-sprayed hydroxyapatite coatings.

F Fazan1, P M Marquis

  • 1Biomaterials Unit, School of Dentistry, The University of Birmingham, St. Chad's Queensway, Birmingham B4 6NN, UK.

Journal of Materials Science. Materials in Medicine
|September 7, 2004
PubMed
Summary

Hydroxyapatite coating stability depends on phase balance and crystallinity. Higher crystallinity reduces dissolution, improving long-term stability in physiological conditions.

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Area of Science:

  • Biomaterials Science
  • Materials Chemistry
  • Surface Science

Background:

  • Plasma-sprayed hydroxyapatite (HA) coatings are crucial for bone implants.
  • Coating stability is vital for long-term in vivo performance.
  • HA coatings consist of multiple phases, influencing their behavior.

Purpose of the Study:

  • To investigate the in vitro dissolution behavior of plasma-sprayed HA coatings.
  • To determine how the phase composition and crystallinity affect dissolution.
  • To understand the impact of electrolyte solutions on HA coating stability.

Main Methods:

  • Dissolution tests in deionized water and tris-buffer solution at 37°C.
  • Monitoring pH changes and measuring released calcium and phosphate ions.

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  • Analyzing changes in crystal structure and surface topology.

    • Main Results:

    • Phosphate ion release was significantly higher in tris-buffer than deionized water.
    • The Ca/P ratio in tris-buffer was approximately three.
    • Increased coating crystallinity led to decreased dissolution rates and higher stability.

    Conclusions:

    • Electrolyte constituents in physiological solutions enhance HA coating dissolution.
    • Coating crystallinity is a key factor determining HA stability.
    • Optimizing HA phase balance and maximizing crystallinity are essential for robust biomaterial coatings.