GB1432664A - Dentures - Google Patents

Abstract

1432664 Making dentures S SCHNEIDER and H S KATZ 3 April 1973 [6 April 1972] 15818/73 Heading A5R A former for use in the preparation of dentures comprises a tray which approximates the shape of a finished denture and carries false teeth on its inner surface, at least part of the outer surface of the tray being formed of a formable material so that the tray can be conformed to the shape of a patients gum or model thereof with the formable material retaining the conformed configuration. A former 20 for an upper denture includes a tray 21 having outer and inner flexible walls 24 26 a palate portion 28 and a lower part 29 having pockets to receive false teeth 42, the tray being formed e.g. by vacuum moulding from a sheet of plastics material having little elastic memory. A formable material 48 is secured to the outer surfaces of walls 26, 28 so that the tray can be deformed into contact with the gums and palate (as shown in outline). Preferably the material 48 is heat-formable, and the former is immersed in hot water prior to being moulded by finger-pressure to the patient's gums and palate. A mouldable spacer may be inserted between the former and the patient's gums. To form a denture a first layer of dentureforming material capable of cold-curing to a rigid acrylic polymer is distributed over the palate and gum portions of the former. A preformed shim of acrylic or non woven polyester is positioned over the material. A second layer of a denture-forming material capable of cold curing to a semi-rigid acrylic polymer is distributed over the shim and the assembly inserted into the patient's mouth and moulded in situ to the gums and palate. A multi-layer shim may be used in which case it is enclosed within the first layer. The tray 21 may be formed from a copolymer of ethylene and vinyl acetate and the formable material may be a wax.