Polymer modified glass ionomer cement comprises: (a) at least one polymer of an alpha , beta -unsaturated carboxylic acid； (b) a basic glass composition that is in a position to react with at least a polymer of an alpha , beta -unsaturated carboxylic acid； (c) at least a radical polymerizable monomer； (d) water； (e) at least a polymerization initiator； and (f) optionally conventional additives such as colorants, tartaric acid, silica, compared to the polymer of an alpha , beta -unsaturated carboxylic acid inert fillers, stabilizers, inhibitors, modifiers and bactericidal substances. Polymer modified glass ionomer cement comprises: (a) at least one polymer of an alpha , beta -unsaturated carboxylic acid； (b) a basic glass composition that is in a position to react with at least a polymer of an alpha ,beta -unsaturated carboxylic acid； (c) at least a radical polymerizable monomer, (d) water； (e) at least a polymerization initiator； and (f) optionally conventional additives such as colorants, tartaric acid, silica, compared to the polymer of an alpha ,beta -unsaturated carboxylic acid inert fillers, stabilizers, inhibitors, modifiers and bactericidal substances. The basic glass composition is present in a combination of a first reactive glass powder with a d50 (grain diameter) value of 1-7 mu m and a d99 (grain diameter) value of 7-20 mu m and a second reactive glass powder with a d50 value of 7-20 mu m and a d99 value of 10-25 mu m, where the proportion of the first reactive glass powder exceeds the amount of the second reactive glass powder. Independent claims are also included for: (1) producing a cured, polymer-modified glass ionomer cement comprising mixing the components, forming the resulting mixture to its desired form and optionally irradiating the mixture with suitable wavelength and energy for the polymerization of monomers； (2) a cured dental material, prepared by mixing the components of a polymer-modified glass ionomer cement and irradiating the mixture w
