Patent ID: 7883334

Claim:
A method of orthodontic treatment, comprising: positioning a first appliance substantially around one or more teeth during a first portion of a recurring time period to apply one of a first predetermined force or a predetermined tooth movement on the one or more teeth, the first appliance formed of a first material and intended for a treatment stage of a treatment plan comprising a plurality of treatment stages; and positioning a second appliance substantially around the one or more teeth during a second portion of the recurring time period to apply one of a second predetermined force or a predetermined tooth movement on the one or more teeth, the second appliance formed of a second material and intended for the same treatment stage as the first appliance, wherein the first and second materials are different and cavity geometries of the first appliance and the second appliance are substantially the same; wherein the first portion and the second portion of the recurring time period are each repeated at least once such that both the first appliance and the second appliance are alternatingly positioned again substantially around the one or more teeth during the respective first or second portion of the recurring time period after the other of the first appliance or the second appliance is removed until the treatment stage is completed.