Orthodontic appliances that accommodate incremental and continuous tooth movement, systems and methods

1. An orthodontic appliance for treating a patient having at least one bracketed tooth coupled to at least one bracket of a wire and bracket appliance, the orthodontic appliance comprising:

an appliance shell comprising a plurality of teeth receiving cavities shaped according to an incremental repositioning stage of a treatment plan to receive and resiliently position teeth of the patient, at least one of the plurality of teeth receiving cavities comprising at least a portion of a relief portion comprising a cavity shaped to receive the at least one bracketed tooth and accommodate mesial-distal movement relative to the appliance shell of the at least one bracketed tooth between a first position in the treatment plan and a second position in the treatment plan different from the first position during the incremental repositioning stage of the treatment plan, the mesial-distal movement being elicited by force applied by the wire and bracket appliance, wherein the relief portion comprises a shortened shell wall extending from an occlusal portion of the at least one bracketed tooth and less than an entire distance between the occlusal portion and a gingival line of the at least one bracketed tooth and defines an unobstructed insertion path for the at least one bracket when the appliance shell is at least one of: positioned on the patient's teeth or removed from the patient's teeth,

wherein a geometry of the cavity is shaped to define a geometric volume encompassing at least a volume corresponding to a geometric summation of volumes occupied by the at least one bracketed tooth when moving along a medial-distal direction along a path between the first position and the second position.

2. The orthodontic appliance of claim 1 , wherein the at least one bracket is disposed at least partially outside the relief portion when the at least one bracketed tooth is received within the cavity.

3. The orthodontic appliance of claim 2 , wherein the shortened shell wall extends partially over the at least one bracket when the at least one bracketed tooth is received within the cavity.

4. The orthodontic appliance of claim 1 , wherein the relief portion comprises a cutout extending around the at least one bracket when the at least one bracketed tooth is received within the cavity so as to provide the unobstructed insertion path for the at least one bracket.

5. The orthodontic appliance of claim 1 , wherein the relief portion is shaped to restrict at least one direction of movement of the at least one bracketed tooth during the movement of the at least one bracketed tooth between the first position and the second position.

6. The orthodontic appliance of claim 1 , wherein the relief portion comprises an active portion that contacts the at least one bracketed tooth so as to apply a force to the at least one bracketed tooth.

7. The orthodontic appliance of claim 1 , wherein the relief portion is shaped to accommodate a plurality of bracketed teeth each coupled to a respective bracket of the wire and bracket appliance.

8. The orthodontic appliance of claim 7 , wherein the relief portion is shaped to accommodate an unbracketed tooth disposed between two bracketed teeth.