Influence of alkali metal ions on the fracture properties of glass polyalkenoate (ionomer) cements.
Biomaterials
; 19(6): 495-502, 1998 Mar.
Article
em En
| MEDLINE
| ID: mdl-9645555
ABSTRACT
The influence of substituting sodium for calcium on the properties of glass polyalkenoate cements was investigated. Two series of glass compositions based on PSiO2 x QAl2O3 x 0.75P2O5 x (1 - Z)CaO x XCaF2ZNa2O were studied. The fluorine content was fixed at X = 0.50 and 0.75 and the sodium content varied by altering Z. The glass polyalkenoate cements formed from these glasses were characterized using a linear elastic fracture mechanics (LEFM) approach. In addition, compressive strengths of the cements were determined. The properties of the cements based on the high fluorine content glasses (X = 0.75) were relatively insensitive to sodium content. The Young's modulus, un-notched fracture strength and fracture toughness of the cements produced with the lower fluorine content glasses (X = 0.5) reduced with sodium content, which was consistent with sodium acting to disrupt ionic cross-linking in the polyacrylate matrix. The compressive strength was not as dependent on sodium content as the LEFM parameters.
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Base de dados:
MEDLINE
Assunto principal:
Sódio
/
Materiais Biocompatíveis
/
Cimentos de Ionômeros de Vidro
Idioma:
En
Ano de publicação:
1998
Tipo de documento:
Article