Ceramics-Silikáty 43, (1) 34 - 40 (1999) |
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STUDY OF BIOACTIVE GLASSES BY "IN VITRO" TESTS - PART 2. EFFECT OF TRIS BUFFER ON TEST RESULTS
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Jonášová Lenka, Rybaříková Ludmila
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Department of Glass and Ceramics, Institute of Chzmical Technology,
Technická 5, 166 28 Prague
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The effect of the TRIS buffer on formation of the apatite surface layer was studied on glasses of the system Na₂O-CaO-SiO₂ both containing phosphorus and free of it. The changes in the specimen surfaces following exposure to model solutions were evaluated by X-ray diffraction analysis and IR spectroscopy. Concentrations of (PO₄)³⁻, Ca²⁺ and SiO₂ were determined in the extracts. The results showed that TRIS speeds up significantly the extraction of glasses and simultaneously formation of the hydroxyapatite layer on the glass surface. |
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