| 摘要 |
<p>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 shell appliances (100) configured to receive the teeth (115) and incrementally reposition individual teeth in a series of successive steps. The individual appliances may be formed from layers (110, 111) having different stiffnesses (elastic moduluses), and the stiffnesses of successive appliances may be different, or both.</p> |
