Inventors:
Loc X. Phan - Milpitas CA
Muhammad Chishti - Sunnyvale CA
Ross J. Miller - Sunnyvale CA
H. Robert Vandenberg - San Ramon CA
Eric Kuo - San Francisco CA
Assignee:
Align Technology, Inc. - Santa Clara CA
International Classification:
A61C 300
Abstract:
The present invention provides improved devices, systems and methods for repositioning teeth from an initial tooth arrangement to a final tooth arrangement. Repositioning is accomplished with a system comprising a series of polymeric appliances configured to receive the teeth in a cavity and incrementally reposition individual teeth in a series of successive steps. This is accomplished by applying force to specific surfaces of the teeth through stiffness of the appliance. However, such stiffness creates limitations in ease of use, patient compliance, and overall cost in material, manufacturing labor and treatment time. To overcome these limitations, the present invention utilizes polymeric or other material appliances with portions differing in rigidity or stiffness. Alternatively, elastic moduluses may differ from one appliance to the next in a successive series to accomplish various treatment goals. Thus, the systems and methods of the present invention provide the design, production and use of such multiple stiffness positioning appliances in orthodontic treatment.