Abstract
Calcium phosphate ceramics are very important materials for prosthetic applications because of their excellent biocompatibility. The chemical composition of the ceramics is determining, both with respect to their capability of inducing calcium phosphate formation and regarding the crystalline phase formed. From a series of porous ceramics based on hydroxyapatite (HAP) containing metal oxides, it was found that only those containing ZrO2 stabilized with 8% Y2O3 were able to induce calcium phosphate formation upon introduction into calcium phosphate supersaturated solutions. The overgrowing phase was increasingly crystalline, did not show any other characteristic X-ray peaks and infrared bands than those pertinent to a-tricalcium phosphate and had a molar Ca∶P ratio of 3∶2. Kinetics analysis with respect to Ca(PO4)2 yielded an apparent order of reaction of 5.0±0.5, suggesting polynuclear nuclei above nuclei growth. The surface energy calculated from the kinetics data for the crystalline overgrowth was found to be 88 mJ m−2.
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Dalas, E., Koutsoukos, P.G. The growth of calcium phosphate on ceramic surfaces. J Mater Sci 24, 999–1004 (1989). https://doi.org/10.1007/BF01148789
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DOI: https://doi.org/10.1007/BF01148789