Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 11, Pages 2757-2763Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.01.025
Keywords
Bioactive glass; Surfaces; Chemical properties; Corrosion; Apatite
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In vitro bioactivity of glasses is usually measured in buffered solutions whereby a formation of a hydroxyapatite layer on the surface is taken as an indication of the bioactivity. In this work we compare the layer formation on three glasses in simulated body fluid, Tris buffer solution, sodium phosphate buffered saline and osteoblast medium. Two of the glasses are known bioactive glasses, 45S5 (45 wt.% SiO2) and S53P4 (53 wt.% SiO2), while the third is an experimental composition with a higher silica content (68 wt.% SiO2). Plates of the glasses were immersed in the solutions at 37 degrees C for different times up to two weeks. The results showed clear differences between the layer developments on the three glasses in the different solutions. The results indicated that the relative order of the reactivity depended on the solution. Thus, results gained in different solutions for different glasses cannot be directly compared. (c) 2012 Elsevier Ltd. All rights reserved.
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