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Related Experiment Videos

Crystallographic changes in calcium phosphates during plasma-spraying.

L G Ellies1, D G Nelson, J D Featherstone

  • 1Eastman Dental Center, Department of Oral Sciences, Rochester, NY 14620.

Biomaterials
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

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Plasma-spraying calcium phosphate coatings on metal implants can alter their composition. Adjusting the ratio of hydroxyapatite (HA) to beta-tricalcium phosphate (beta-TCP) may control implant dissolution rates.

Area of Science:

  • Biomaterials science
  • Materials engineering
  • Bioceramics

Background:

  • Hydroxyapatite (HA) coatings enhance metal implant integration.
  • Plasma-spraying is a common technique for applying HA coatings.
  • Understanding crystallographic changes during plasma-spraying is crucial for optimizing implant performance.

Purpose of the Study:

  • To investigate the crystallographic changes in calcium phosphate coatings during plasma-spraying.
  • To analyze the effects of different process parameters on the resulting coating phases.
  • To explore methods for controlling the dissolution rate of implant coatings.

Main Methods:

  • Plasma-spraying of precipitated calcium-deficient apatite and stoichiometric hydroxyapatite (HA) onto metal substrates.

Related Experiment Videos

  • Utilizing various hydrogen gas flow conditions and temperatures during spraying.
  • Surface characterization using X-ray diffraction and scanning electron microscopy.

    • Main Results:

    • Plasma-sprayed coatings consisted of mixtures of hydroxyapatite (HA), beta-tricalcium phosphate (beta-TCP), and calcium oxide.
    • Stoichiometric HA exhibited minimal degradation (5%) after plasma-spraying.
    • The ratio of HA to beta-TCP varied depending on the initial powder and spraying conditions.

    Conclusions:

    • Plasma-spraying induces crystallographic transformations in calcium phosphate coatings.
    • The resulting HA/beta-TCP ratio can be influenced by process parameters.
    • Tailoring the HA/beta-TCP ratio offers a potential strategy to control the in vivo resorption rate of bioceramic coatings.