The present invention provides a dental gypsum slurry comprising water and a dental gypsum powder that contains hemihydrate gypsum and a polycarboxylic acid water-reducing agent, wherein the water-powder ratio of water to the dental gypsum powder is 0.24 to 0.50, and when the mixed water and dental gypsum powder are poured, 30 seconds after the start of mixing, up to a height of 50 mm in a cylindrical mold that is vertically disposed on a flat surface and has an inner diameter of 35 mm and the cylindrical mold is pulled upward at 10 mm/s so that the mixture spreads planarly, the diameter of the mixture is 141.4 mm or more.
