Influence of P2O5 on crystallinity of apatite formedin vitro on surface of bioactive glasses

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Abstract
Two sol-gel glasses with 80 mol % SiO2 were prepared in the system SiO2−CaO−P2O5; the first one had 3 mol% P2O5 in its composition, and the second one was P2O5 free. The in vitro behavior of glasses was studied by soaking them in simulated body fluid for 7 days at 37°C. After the in vitro test, the study by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, electron diffraction, and transmission electron microscopy showed an apatite-like layer had formed on the surface of both glasses. However, for identical soaking time, the apatite crystals formed on the surface of the glass containing P2O5 in the composition were larger. Therefore, the presence of P2O5 in the sol-gel glass composition promotes the crystal growth of the apatite. © 1999 John Wiley & Sons, Inc. Inc. J Biomed Mater Res, 46, 560–565, 1999.

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