Abstract: A precision investment casting assembly has a model support consisting of a central upstanding sprue former and outwardly extending tubes to support wax models. The sprue former is held at one end by a resilient base. A somewhat key-hole shaped recess in the base receives a split flask which encircles the support. An elongated pin engages the free edges of the split flask to close it while embedment material is poured around the support. The pin is removed to release the flask from the embedment material after casting. Proper orientation of the support elements is aided by a plurality of keys and keyways.

Abstract: Models for dental restoration work are provided with a plurality of elongated openings through which dowels secured to individual tooth members may be reached. The openings are formed by resilient cores cast in the models. The tooth members may thus be removed and replaced from the model easily and accurately. Two or more dowels may be used in each tooth member without need for careful spacing because of the slotted construction of the cores.

Abstract: A dental restoration fabricating device in which dowels are employed to locate and register teeth and teeth dies. The dowels are held in their original positions by plastic holders arranged on an adjustable fence surrounding a base which, in turn, supports an impression of the patient's mouth. An alternate form includes an alignment pin for more accurate location of the tooth dies.

Abstract: Precision investment casting of small parts with fine detail and free of air inclusions is achieved by the use of flat sided blocks of a relatively high melting point plastic material received upon elongated tubes or rods of the same or similar material. The shape and size of the blocks permit a large number of small parts to be cast at the same time and provide reservoirs for the molten casting metal close adjacent the casting cavity.