In vitro dissolution of plasma-sprayed hydroxyapatite coatings with different characteristics: experimental study and modeling

The dissolution of plasma-sprayed hydroxyapatite (PHA) coatings with different characteristics, produced by various spraying conditions, in a Tris-buffered solution at pH 7.4 was experimentally studied through the measurement of the release of calcium ions. The phase composition of the coatings at s...

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Bibliographic Details
Published in:Biomedical materials (Bristol) 2008-03, Vol.3 (1), p.015006-015006
Main Authors: Mohammadi, Z, Ziaei-Moayyed, A A, Sheikh-Mehdi Mesgar, A
Format: Article
Language:English
Subjects:
Body Fluids - chemistry
Coated Materials, Biocompatible - chemistry
Colloids - chemistry
Computer Simulation
Crystallization - methods
Durapatite - chemistry
Gases - chemistry
Hot Temperature
Materials Testing
Models, Chemical
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Summary:The dissolution of plasma-sprayed hydroxyapatite (PHA) coatings with different characteristics, produced by various spraying conditions, in a Tris-buffered solution at pH 7.4 was experimentally studied through the measurement of the release of calcium ions. The phase composition of the coatings at surface and interface, and the porosity were evaluated. The analytical modeling revealed that the calcium dissolution process was composed of two stages. The first stage was found to be both surface and diffusion controlled. The second stage was an exactly diffusion-controlled dissolution. In the first stage, the rate of dissolution and the solubility of the coatings with minimum contents of impurity phases were mainly influenced by the contents of recrystallized HA (RHA) and amorphous calcium phosphate (ACP). It is suggested that the optimized values of the ACP and the RHA at the coating surface can tend to encourage the early fixation properties of the PHA coatings.
ISSN:1748-605X
1748-6041
1748-605X
DOI:10.1088/1748-6041/3/1/015006