A dental prosthesis, such as a crown, a bridge, inlay, onlay, a laminate veneer or an artificial tooth, or a dental prosthesis base material, such as an abutment, an abutment having a post, or a post, is made with a low cost in a short time by using dental glass ionomer cement, which is excellent in cost, mechanical strength and biocompatibility and has fluorine sustained releasability in general, by a method comprising steps of enclosing a mixture of dental glass ionomer cement into a mold in a shape fitting to the dental prosthesis or the dental prosthesis base material to be made, putting the mold into water, irradiating the whole mold with a microwave, and curing the dental glass ionomer cement in a short time, thereby a conventional problem of slow curing reaction in dental glass ionomer cement is solved.