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US 10,946,630 B2Granted
Dual shell dental appliance and material constructions
AssigneeBay Materials, LLC
InventorsRay F. Stewart, John Lahlouh
Life of this patent
Estimating the term…
Abstract
Improved dental appliances and polymeric sheet compositions are disclosed. The polymeric sheet compositions are useful for making dental appliances having outer layers comprised of a material having a modulus of from about 1,000 MPA to 2,500 MPA (“hard”) and an inner core comprised of elastomeric material or materials having a modulus of from about 50 MPa to 500 MPa (“soft”), which exhibit improved flexibility and strength, and better stain and tear resistance than currently available materials and dental appliances.
Claims18
A polymeric sheet composition, comprising:
- at least two outer layers A and C and an elastomeric inner layer B, wherein one or more of the outer layers A and C is a polyester or co-polyester having a flexural modulus of from about 1,000 MPa to 2,500 MPa, the inner layer B is comprised of an elastomeric material having a hardness from about A80 to D75, and the polymeric sheet composition has a flexural modulus of from about 750 MPa to 2,000 MPa.
A polymeric sheet composition, comprising:
- more than two rigid layers, wherein at least one of the rigid layers is disposed between two or more elastomeric layers, and
- (a) the rigid layers individually comprise a material having a flexural modulus of from about 1,000 MPa to 2,500 MPa, and
- (b) the elastomeric layers individually comprise a polyurethane having a hardness from about A80 to D75.
Dependencies are inferred from the claim text.