Abstract
The influence of substituting sodium for calcium on the properties of glass polyalkenoate cements was investigated. Two series of glass compositions based on PSiO 2·QAl 2O 3·0.75P 2O 5·(1− Z)CaO· XCaF 2 ZNa 2O 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, comprehensive 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 comprehensive strength was not as dependent on sodium content as the LEFM parameters.
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