The glass polyphosphonate cement:  a novel glass-ionomer cement based on poly(vinyl phosphonic acid).
This paper outlines research which aimed to develop a new type of Glass-ionomer cement, the glass polyphosphonate cement.  The glass polyalkenoate cement, a form of Glass-ionomer cement, is now widely used in dentistry and is based on the reaction between an ion-leachable aluminosilicate glass and an aqueous solution of poly(acrylic acid) or its copolymers.  The new cements described in this paper employ a novel polymer, poly(vinyl phosphonic acid), PVPA, as the acidic component.  This is a much stronger acid than those used in the glass polyalkenoate cement, and various means must be employed to moderate the reaction in order to obtain a viable cement.  These cements show a number of important differences in performance in comparison with PAA-based systems and these differences are discussed in the paper.
Materials Technology Group, Laboratory of the Government Chemist, Middlesex, UK.
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Ellis
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Anstice
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Wilson
D005465:Fluorocarbon Polymers; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D010756:Phosphoric Acids; D011108:Polymers