poly (carboxylat) cements and their use in particular in dentistry

摘要

1422337 Polycarboxylate dental cements NATIONAL RESEARCH DEVELOPMENT CORP 4 April 1973 [18 April 1972] 17880/72 Heading C3P A cement-forming liquid for use as a component of a polycarboxylate cement comprises an aqueous solution of a water-soluble poly- (carboxylic acid) having a relative viscosity of 1À05 to 2À00 together with up to 20% by weight, based on the poly-(carboxylic acid), of a watersoluble chelating agent. The cement-forming liquid can be packaged with a cement powder to form a dental cement pack, the contents of which when admixed together produce a plastic mass which rapidly hardens. The water-soluble acid polymer may be a homo. polymer or copolymer of acrylic, 2-chloroacrylic, 3-chloroacrylic, 2-bromoacrylic, 3-bromoacrylic, methacrylic, itaconic, maleic, glutaconic, aconitic, citraconic, mesaconic, fumaric or tiglic acid. Examples of suitable chelating agents are ethylene diamine tetraacetic acid, salicyclic acid, citric acid, 2,4- and 2,6- dihydroxybenzoic acids, dihydroxytartaric acid, nitrilotriacetic acid, tartaric acid, mellitic acid, polyglycols, complexes of aluminium and chromium with #-diketones (e.g. acetyl acetone) and complexes of zinc and copper with ethylenediamine tetraacetic acid. The cement powder used in the cement pack may be a metal oxide (preferably heat deactivated) such as zinc oxide, optionally admixed with magnesium oxide; a fused oxide product such as that obtained by heat-fusing a mixture of calcium or sodium oxide with alumina, silica and phosphorus pentoxide; or preferably a fluoro-alumino silicate glass powder (as described in Specification No. 1,316,129). The cement powder may optionally include a fluoride, bacteriostatic agent or antibiotic. In one example the components also include propanol-2 as a stabilizing agent. The cements are particularly useful in dental applications but can also be employed in other surgical applications such as orthopaedic surgery.