Abstract: A dental device is provided for fabricating dies from flexible impression material wherein the model, die and articulation mounting are accomplished in a single pouring. The device comprises a pair of recessed pivotal trays generally shaped to an individual's jaw. The member each includes inner and outer walls having internal ridges running vertically therealong at spaced distances and a base having predetermined spaced apertures thereabout to receive an insert. The trays are designed to be mounted face to face with a like member and open to 180.degree.. The tray includes hollow cylindrical portions in the rear thereof, engaged by a transverse element for pivoting thereabout. A vertical stop pin is mounted through the distal arm to maintain the respective spacing of the trays. The insert member has downwardly projecting portions extending through the base apertures, a base engaging the base of the tray and an upwardly extending rib which is located centrally within the walls of the tray.