PARTICULATE HYDROGEL MATERIAL

摘要

A particulate hydrogel material is made by grinding the product of reacting submicron acid-degradable fluoridated aluminosilicate glass to completion with poly(acrylic acid). This material is used in a two-paste cement pack for a dental cement which, when mixed, cures by light-activation, a glass ionomer reaction and a chemical curing. Both pastes contain cross-linkable methacrylate monomers and the above pre-reacted particulate material, which is fluorine-containing glass ionomer cement totally depleted of unreacted glass. The first paste also contains poly(acrylic acid) or poly(vinyl phosphonic) acid or both. The second paste, which is a command-cure cement in its own right, contains a zinc glass and poly(acrylic acid) but the reaction between these is held in suspended animation until the paste is exposed to air and light.