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Titolo:
Effects of Si speciation on the in vitro bioactivity of glasses
Autore:
Oliveira, JM; Correia, RN; Fernandes, MH;
Indirizzi:
Univ Aveiro, Dept Ceram & Glass Engn, UIMC, P-3810193 Aveiro, Portugal Univ Aveiro Aveiro Portugal P-3810193 , UIMC, P-3810193 Aveiro, Portugal
Titolo Testata:
BIOMATERIALS
fascicolo: 2, volume: 23, anno: 2002,
pagine: 371 - 379
SICI:
0142-9612(200201)23:2<371:EOSSOT>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMULATED BODY-FLUID; APATITE FORMATION; SILICA-GEL; COMPOSITIONAL DEPENDENCE; INVITRO EVALUATION; SURFACE; CERAMICS; LAYER; SYSTEM; PHASE;
Keywords:
bioactive glasses; magnesium oxide; in vitro tests; apatite layer; glass speciation; biomineralisation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Fernandes, MH Univ Aveiro, Dept Ceram & Glass Engn, UIMC, P-3810193 Aveiro, Portugal Univ Aveiro Aveiro Portugal P-3810193 193 Aveiro, Portugal
Citazione:
J.M. Oliveira et al., "Effects of Si speciation on the in vitro bioactivity of glasses", BIOMATERIAL, 23(2), 2002, pp. 371-379

Abstract

The surface reactivity of glasses belonging to the (mol%) 31SiO(2)-11P(2)O(5)-(58-x)CaO xMgO series, with x ranging from 0 to 32, was studied in Kokubo's simulated body fluid (SBF). Scanning electron microscopy, inductively coupled plasma spectroscopy and Fourier transform infrared spectroscopy were used to characterise the glass surface and the SBF compositional changes. All glasses develop surface layers rich in silica and calcium phosphate. An increasing surface activity with increasing MgO/CaO ratio was observed, In a previous investigation using magic-angle spinning nuclear magnetic resonance it was found that there is an increasing abundance of Q(0) species inthe glass structure with increasing MgO content. The present work shows that, when immersed in SBF, Q(0)-rich glasses are easily leached to form a silica gel layer. It is concluded that MgO in the glass indirectly improves the early stages of mineralisation by favouring Q(0) speciation. This mechanism plays an important role in glass bioactivity. (C) 2001 Elsevier ScienceLtd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 21:55:32