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Glass-Ceramics of the Wollastonite - Tricalcium Phosphate-Silica System

Published online by Cambridge University Press:  01 February 2011

Jorge López-Cuevas
Affiliation:
CINVESTAV-IPN Unidad Saltillo, Ramos Arizpe, 25900 Coah., México
Martín I. Pech-Canul
Affiliation:
CINVESTAV-IPN Unidad Saltillo, Ramos Arizpe, 25900 Coah., México
Juan C. Rendón-Angeles
Affiliation:
CINVESTAV-IPN Unidad Saltillo, Ramos Arizpe, 25900 Coah., México
José L. Rodríguez-Galicia
Affiliation:
CINVESTAV-IPN Unidad Saltillo, Ramos Arizpe, 25900 Coah., México
Carlos A. Gutiérrez-Chavarría
Affiliation:
CINVESTAV-IPN Unidad Saltillo, Ramos Arizpe, 25900 Coah., México
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Abstract

Glass-ceramics based on hypo-eutectic (GC1) and hyper-eutectic (GC2) compositions of the Wollastonite (W, CaSiO3) - Tricalcium Phosphate [TCP, Ca3(PO4)2] binary system, which are saturated with SiO2 during the glass melting stage, are synthesized by the petrurgic method, using cooling rates of 0.5, 1 or 2°C/h. All synthesized materials are subjected to in vitro bioactivity tests using Kokubo's Simulated Body Fluid (SBF). Primary a-Cristobalite is formed in all cases. Metastable Apatite [Ap, Ca10(PO4)6O] and W phases are additionally formed, in general, in the GC1 glass-ceramics, as well as in the GC2 material obtained at a cooling rate of 0.5°C/h. However, at faster cooling rates, TCP is formed instead of Ap phase in the latter composition. During the bioactivity tests, a hydroxyapatite [HAp, Ca10(PO4)6(OH)2]-like surface layer is formed in all materials. It is proposed that GC2 glass-ceramics cooled at a rate of 1°C/h have the potential to show good in vivo osseointegration properties.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

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