Abstract
Sintered fluorapatite and hydroxyapatite ceramic implants have been shown to be non-degradable in animal and human research. It was found however that plasma-sprayed coatings of hydroxyapatite ceramic degraded in vivo, possibly because the ceramic lost almost 50% of its crystallinity during the plasma-spraying procedure. A heat treatment at 600° C proved to be the method op choice to reconstitute the crystallinity of the hydroxyapatite coating and to promote the transformation of α -tricalcium phosphate into the more stable β -tricalcium phosphate. Fluorapatite coatings did not loose their crystallinity during plasma-spraying and had the added advantage of stability due to the fluoride ion. The solubility in vitro of the fluorapatite and hydroxyapatite heat-treated coatings were compared to the sintered hydroxyapatite ceramic and the untreated hydroxyapatite coatings. Heat treatment reduced the dissolution rate of the hydroxyapatite coating which originally was 92%, to only 9%, while 13% of the fluorapatite coating was found to dissolve.
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© 1992 Elsevier Science Publishers Ltd
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Denissen, H.W., De Nieuport, H.M., Kalk, W., Schaeken, H.G., Van Den Hooff, A. (1992). Fluorapatite and Hydroxyapatite Heat-Treated Coatings for Dental Implants. In: Ravaglioli, A., Krajewski, A. (eds) Bioceramics and the Human Body. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2896-4_17
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DOI: https://doi.org/10.1007/978-94-011-2896-4_17
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-85166-748-2
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