Dissolution kinetics physico-chemical reacyions at bioactive glass/bone interface studied by STEM-EDXS - IN2P3 - Institut national de physique nucléaire et de physique des particules
Communication Dans Un Congrès Année : 2004

Dissolution kinetics physico-chemical reacyions at bioactive glass/bone interface studied by STEM-EDXS

Résumé

Bioactive glass coatings are interesting to develop direct bond between prostheses and bone. But, the high solubility of these materials limits their application. Addition of alumina can be used to control their solubility, but may inhibit the bonding mechanisms. In this work, we study a bioactive glass in the SiO2-Na2O-CaO-P2O5-K2O-Al2O3-MgO system. After delays of implantation from 2 to 12 months, the bioactive glass/bone interface is characterised by Energy Dispersive X-ray spectroscopy coupled to Scanning Transmission Electron Microscopy. Bioactive glass dissolution can be decomposed in three steps with selective leaching. Results show that at 2 months after implantation, the bioactive glass is composed with Al, Si, Ca and P. Alumina addition increases the coating stability without inhibiting bonding process. Complex physico-chemical reactions take place at the glass periphery. The coating bonded to bone through a Ca-P rich layer on top of a Si rich layer. These phenomena are associated to bioactivity property, which occurs up to 6 months. At this period, the dissolution of the apatite layer occurs. After 12 months, the bioactive glass is composed with silicon
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Dates et versions

in2p3-00023564 , version 1 (12-01-2005)

Identifiants

  • HAL Id : in2p3-00023564 , version 1

Citer

Edouard Jallot, E. Chassot, J.L. Irigaray, H. Benhayoune, L. Kilian, et al.. Dissolution kinetics physico-chemical reacyions at bioactive glass/bone interface studied by STEM-EDXS. 10th Mediterranean Conference on Medical and Biological Engineering MEDICON 2004, Jul 2004, Naples, Italy. ⟨in2p3-00023564⟩
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