A method of making casts for permanent, complete acrylic resin denture bases without blocking out undercuts.

Abstract

denture base is to either manually adapt or vacuum form materials, in their plastic state, to a master cast before flasking and processing. After processing, the master cast usually is destroyed when the denture base is deflasked. Making a cast for processed denture bases involves blocking out areas of undercut found in the maxillary labial or mandibular incisal regions or buccal to the tuberosities. If this precaution is not taken, removal of the denture base from the cast may cause a possible crack-initiation point with high local stress concentration, which may in turn cause the denture base to fracture. An alternative method for making a cast is to use condensation-polymerized silicone. This material is adapted to the intaglio surface of the processed denture base and, when set, is cast in plaster. The denture base then can be removed from the cast without damaging it.