US 12,390,308 B2
Multi-layered dental appliance
Richard Y. Liu, Woodbury, MN (US); Daniel J. Skamser, Ham Lake, MN (US); Bhaskar V. Velamakanni, Woodbury, MN (US); Nathaniel I. Lehn, White Bear Lake, MN (US); Mitchell A. Hirsch, Woodbury, MN (US); and Lyudmila A. Pekurovsky, Bloomington, MN (US)
Assigned to Solventum Intellectual Properties Company, Maplewood, MN (US)
Appl. No. 17/417,851
Filed by SOLVENTUM INTELLECTUAL PROPERTIES COMPANY, Maplewood, MN (US)
PCT Filed Dec. 30, 2019, PCT No. PCT/IB2019/061444
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/141440, PCT Pub. Date Jul. 9, 2020.
Claims priority of provisional application 62/787,009, filed on Dec. 31, 2018.
Prior Publication US 2022/0061961 A1, Mar. 3, 2022
Int. Cl. A61C 7/08 (2006.01); B32B 1/00 (2024.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01)
CPC A61C 7/08 (2013.01) [B32B 1/00 (2013.01); B32B 27/08 (2013.01); B32B 27/36 (2013.01); B32B 27/365 (2013.01); A61C 2201/00 (2013.01); B32B 2250/05 (2013.01); B32B 2250/244 (2013.01); B32B 2250/42 (2013.01); B32B 2270/00 (2013.01); B32B 2307/41 (2013.01); B32B 2307/558 (2013.01); B32B 2535/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A dental appliance for positioning a patient's teeth, comprising:
a polymeric shell comprising a plurality of cavities for receiving one or more teeth, wherein the polymeric shell comprises at least one arrangement of alternating polymeric layers ABA or BAB, wherein:
layer A comprises a thermoplastic polymer A, wherein the thermoplastic polymer A comprises polyethylene terephthalate glycol (PETg);
layer B comprises a thermoplastic polymer B, wherein the thermoplastic polymer B comprises polycyclohexylenedimethylene terephthalate glycol (PCTg);
each of the thermoplastic polymers A and B has a flexural modulus of about 1.0 GPa to about 4.0 GPa; and
each of the thermoplastic polymers A and B has a glass transition temperature (Tg) greater than about 40° C.,
wherein the polymeric shell includes an outer major surface and an inner major surface, wherein the outer major surface of the polymeric shell includes a set of performance enhancing layers, the set of performance enhancing layers including at least two performance enhancing layers selected from the group consisting of a tie layer, a thermoforming assistance layer, a moisture barrier layer, and a stain-resistant layer, and
wherein the set of performance enhancing layers includes at least one of: thermoplastic polyurethanes (TPU) or olefins.