Effect of sintering conditions of zirconia-yttria-titania-based ceramics composite on the densification and microstructure
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2018
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INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62.
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Glass dissolution and bioactivity are two phenomena strictly related to each other in
biocompatible glasses. By controlling the glass dissolution, the ions of the glass matrix
can be released on controlled manner, and the glass can play a role as a resorbable
or bioactive biomaterial, depending on the ratio of the oxides into glass composition.
In this work, we studied the glass dissolution of three compositions of biocompatible
glasses with potential applications in regenerative medicine. Glasses based on the
system 47SiO2-(37- x)Na2O-(10+x)CaO containing 6 wt% P2O5 (x = 0, 5 and 10) were
obtained by melt-quenching at 1500°C/1h. The biocompatibility of these glasses was
performed by immersion in a simulated body fluid solution up to 21 days, and then the
glasses were characterized by XRD, FTIR, Raman spectroscopy and SEM. Glass
dissolution kinetics essay was carried out in buffer solution at pH 7 and 37°C, and the
ionic concentration of the leached ions was measured by ICP-OES. The results
suggested that the speciation of silicate Qn units plays an important role on dissolution
kinetics at the very first time of dissolution, which, in turn, can increase bioactivity. On
the other hand, once the hydroxyapatite layer is nucleated on the glass surface, it acts
as a barrier between the glass and the aqueous medium, decreasing the dissolution
rate. The overall results give new insights about the relationship between dissolution
and bioactivity, and how to approach dissolution in bioactive glasses.
Como referenciar
ARATA, A.; USSUI, V.; LIMA, N.B.; LAZAR, D.R.R.; SOUZA, G.M.D. de; MARCHI, J. Effect of sintering conditions of zirconia-yttria-titania-based ceramics composite on the densification and microstructure. In: INTERNATIONAL CONGRESS ON CERAMICS, 7th; CONGRESSO BRASILEIRO DE CERÂMICA, 62., June 17-21, 2018, Foz do Iguaçu, PR. Abstract... p. 123-123. Disponível em: http://repositorio.ipen.br/handle/123456789/29684. Acesso em: 20 Mar 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.