Dentures
AssigneePolythetics, Inc.
InventorsRalph W. Colpitts, Kurt C. Frisch, Adolfas Damusis
Life of this patent
Estimating the term…
Abstract
A denture consisting of teeth anchored in a gum member composed of a unitary mass of non-hydrophilic polyurethane elastomer, the tooth-holding portion of which is hard and the mouth-engaging portion of which is soft is prepared by first casting the teeth-holding portion about the teeth and then casting the gum holding portion onto the tooth-holding portion and curing the denture during which the gum-engaging portion and the tooth-holding portion become integrally chemically bonded into a unitary mass.
Claims9
A denture consisting of teeth anchored in a gum member comprising a tooth-holding portion and a mouth-engaging portion, the tooth-holding portion being composed essentially of hard non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D 40, and the mouth engaging portion being composed essentially of soft non-hydrophilic polyurethane elastomer having a hardness of not greater than about Shore A 65, said tooth-holding portion and said mouth-engaging portion being integrally chemically bonded into a unitary mass.
A denture consisting of teeth anchored in a gum member comprising a tooth-holding portion and a mouth-engaging portion, the tooth-holding portion being composed essentially of hard non-hydrophilic polyurethane elastomer having a hardness of not less than about Shore D 40, and the mouth-engaging portion being composed essentially of soft non-hydrophilic polyurethane elastomer having a hardness of not greater than about Shore A 65, said tooth-holding portion and said mouth-engaging portion being integrally chemically bonded into a unitary mass and in which the hard and soft polyurethane elastomers are cross-linked hard and soft isocyanate-terminated prepolymers, respectively, and have a NCO/OH ratio of about 1.05 to 1.0 to 1.1 to 1.0.
Dependencies are inferred from the claim text.