Ceramics-Silikáty 38, (3) 119 - 122 (1994)

The leaching of bioactive glass-ceramics of the apatite-wollastonite type in water and in a simulated body fluid was studied using standard tests with granular specimens and exposures at 37°C. The solutions were analyzed for Ca and SiO₂ and the evolution of both concentrations with time was examined in comparison with the CaO/SiO₂ ratio. A considerable increase in the rate of leaching was found in buffered solutions due to the effect of TRIS on the conditions for the deposition of a hydroxyapatite protective layer on the leached surface.