STEM and EDXS characterization of physicochemical reactions at the interface between a bioglass coating and bone

✍ Scribed by Jallot, E.; Benhayoune, H.; Kilian, L.; Irigaray, J. L.; Oudadesse, H.; Balossier, G.; Bonhomme, P.

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 574 KB
• Volume: 29
• Category: Article
• ISSN: 0142-2421
• DOI: 10.1002/(sici)1096-9918(200005)29:5<314::aid-sia871>3.0.co;2-l

✦ Synopsis

Knowledge of the local concentration and species of ions released at the bioglass/bone interface is primordial to the understanding of complex interfacial reactions and physicochemical properties of bioactive glasses. This work characterizes the interface that bioactive glass coatings develop with hard tissue. The distribution of silicon, phosphorus, calcium and aluminium varied between the surface of the glass and the bone: a silicon-rich gel layer appeared at the bioglass surface. Then, significantly higher concentrations of Ca and P are observed at the periphery of the newly formed silicon layer compared to the surface of the glass. A thick (~3 µm) Ca-P-rich layer was formed and bonded to bone. The Ca-P layer appeared to be generated by calcium and phosphate ions diffusing through the gel layer, which contain at least traces of these ions. Addition of alumina to the bioglass reduced dissolution without inhibiting bioactive properties.