Prosthetic positioning device for dentistry

Claim 1

A positioner for immobilizing parts of a prosthetic dental casting and allowing molding of the casting in a single operation, said casting having a base portion and an impression portion, the impression portion being molded by an impression, the positioner comprising: a sleeve having a tapering bore therethrough and an outer surface, the outer surface having outwardly extending protrusions for retaining said sleeve in the base portion of said casting, said bore having a rectangular cross section and the outside surface being engagable with a parallelizer for orientating said positioner, said extending protrusions limiting the engagement of said parallelizer; a plate having opposite first and second sides; a post protruding from said first side, said post having a groove for retaining said post in said impression portion; a tapering male part protruding from said second side, said male part having a cross section that matches that of said tapering bore, said male part being received in said bore during casting and being removable from said bore thereafter; a plurality of tongues extending from said plate in the general plane of said plate, said tongues retaining said positioner on the impression during casting; and a band of semi-rigid material about said impression for retaining molding material during casting.