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Incorporation of a controlled-release glass into a calcium phosphate cement

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Abstract

A so-called controlled-release glass was synthesized occurring in the system CaO-Na2O-P2O5. A certain sieve fraction of this glass was incorporated in a calcium phosphate cement, of which the powder contained α-tricalcium phosphate (α-TCP), dicalcium phosphate (DCP) and precipitated hydroxyapatite (HA). The glass appeared to retard the cement setting slightly and it reduced considerably the compressive strength after aging in aqueous solutions which were continuously refreshed. Scanning electron microscope (SEM) pictures and X-ray diffraction (XRD) patterns of the samples after 5 weeks of aging showed that the glass was not dissolved but that large brushite crystals were formed. Thereby, aging in CaCl2 solutions resulted in more brushite formation than aging in NaCl solutions. The brushite crystals did not reinforce the cement. Neither was the aged glass-containing cement weaker than it was before the brushite formation right after complete setting. In conclusion, the incorporation of controlled-release glasses into a calcium phosphate cement and subsequent aging in aqueous solutions did not result in the formation of macropores in the cement structure, but that of brushite crystals. This incorporation reduced the compressive strength of the cement considerably. © 1999 Kluwer Academic Publishers

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Authors and Affiliations

  1. Department of Materials Science and Metallurgy, Universitat Polite`cnica de Catalunya, Avda. Diagonal 647, E-08028, Barcelona, Spain

    I. Khairoun, M. G. Boltong, F. J. Gil, F. C. M. Driessens & J. A. Planell

  2. Department of Crystallography and Mineralogy, Faculty of Geology, Universitat de Barcelona, Spain

    M. M. Seijas & S. Marti´nez

Authors
  1. I. Khairoun
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  2. M. G. Boltong
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  3. F. J. Gil
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  4. F. C. M. Driessens
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  5. J. A. Planell
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  6. M. M. Seijas
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  7. S. Marti´nez
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Khairoun, I., Boltong, M.G., Gil, F.J. et al. Incorporation of a controlled-release glass into a calcium phosphate cement. Journal of Materials Science: Materials in Medicine 10, 215–218 (1999). https://doi.org/10.1023/A:1008954011349

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