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Related Experiment Videos

Surface characteristics and dissolution behavior of plasma-sprayed hydroxyapatite coating.

Limin Sun1, Christopher C Berndt, Khiam Aik Khor

  • 1Center for Thermal Spray Research, State University of New York at Stony Brook, 306 Old Engineering, Stony Brook, New York 11794-2275, USA.

Journal of Biomedical Materials Research
|September 5, 2002
PubMed
Summary

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Plasma-sprayed hydroxyapatite (HA) coatings show lower dissolution than powders due to crystallinity. Coating stability in physiological solutions suggests potential for long-term clinical use.

Area of Science:

  • Biomaterials Science
  • Materials Engineering
  • Biomedical Engineering

Background:

  • Plasma-sprayed hydroxyapatite (HA) coatings are crucial in clinical applications.
  • Coating resorption and dissolution at neutral pH are significant concerns.
  • Understanding HA coating dissolution is vital for improving implant longevity.

Purpose of the Study:

  • To investigate the dissolution behavior of plasma-sprayed HA coatings.
  • To compare the dissolution of HA coatings with HA powders.
  • To identify factors influencing HA coating dissolution and stability.

Main Methods:

  • Atmospheric plasma spraying of highly crystalline pure HA powders using varied parameters.
  • Measurement of dissolution using a calcium ion meter.

Related Experiment Videos

  • Analysis of surface characteristics (phase, morphology, roughness) before and after dissolution via X-ray diffraction.

    • Main Results:

    • Pulverized HA coatings exhibited higher dissolution than HA powders due to decreased crystallinity and fine crystal size.
    • Coating dissolution decreased with increasing crystallinity.
    • HA coatings reached saturation in physiological solution, with lower saturation values than powders, indicating potential long-term stability.
    • Particle melting status (nanocrystal volume) and porosity were key factors in dissolution.
    • Higher power spraying (42 kW) resulted in bone apatite patterns and surface morphology changes, unlike lower power (27.5 kW) which showed crystalline HA.

    Conclusions:

    • Coating crystallinity and particle melting status significantly influence HA coating dissolution.
    • Plasma-sprayed HA coatings demonstrate improved stability in physiological solutions compared to powders.
    • Optimized plasma spraying parameters can enhance the stability and clinical performance of HA coatings.