Patent ID: 11969309
Assignee: SOLVENTUM INTELLECTUAL PROPERTIES COMPANY
Field: Surface technology, coating (Chemistry)
Classification: CPC A  B | IPC A  B

Claim 12:
13. A system for repositioning teeth of a patient from an initial tooth arrangement to a final tooth arrangement, the system comprising a series of polymeric shells, wherein the polymeric shells each comprise an arrangement of cavities configured to receive one or more teeth in an upper arch or a lower arch of the patient and apply a resilient positioning force to cause a predetermined incremental movement of one or more teeth from a first position to a second position, wherein the polymeric shells in the series comprise:
a first multilayer shell with a bending stiffness factor less than about 0.1 GPa*mm3 as measured within 2 mm of a trimmed line of incisors on a labial side of the first shell, and an elastic modulus no greater than about 1.5 GPa, wherein the first multilayer shell comprises:
a core layer with a first major surface and a second major surface, wherein the core layer has an elastic modulus of greater than 1.3 GPa;
a first interior layer on the first major surface of the core layer, and a second interior layer on the second major surface of the core layer, wherein each of the first and the second interior layers have an elastic modulus of less than 0.5 GPa; and
a first exterior layer on the first interior layer and a second exterior layer on the second interior layer, wherein the first and the second exterior layers each have an elastic modulus of greater than 1.3 GPa; and
a second shell with a bending stiffness factor greater than 0.1 GPa*mm3 as measured within 2 mm of a trimmed line of incisors on a labial side of the second shell.