Attachment structure

1. A system, comprising:

a first appliance of a series of appliances designed to incrementally implement a treatment plan, comprising a first shell having a plurality of cavities therein designed to receive teeth of a first jaw;

an attachment structure designed to be attached to at least one tooth of the first jaw, wherein:

the attachment structure includes a plurality of surfaces arranged about a center point of the attachment structure; and

the first shell is designed to interface with a first surface of the plurality of surfaces to provide a first engagement force specific to a first stage of the treatment plan; and

a second appliance of the series of appliances, comprising a second shell having a plurality of cavities therein designed to receive the teeth of the first jaw;

wherein the second shell is designed to interface with a second surface of the plurality of surfaces of the attachment structure attached to the at least one tooth of the first jaw to provide a second engagement force specific to a second stage of the treatment plan.

2. The system of claim 1 , wherein the first shell is designed to interface with a first subset of the plurality of surfaces to provide the first engagement force; and

wherein the second shell is designed to interface with a second subset of the plurality of surfaces to provide the second engagement force.

3. The system of claim 2 , wherein the first subset and the second subset include at least one surface that is different between them.

4. The system of claim 2 , wherein the first subset and the second subset include at least one common surface between them.

5. The system of claim 1 , wherein the first shell is designed to interface with the first surface to provide the first engagement force to move the at least one tooth toward a first position that is specific to the first stage of the treatment plan.

6. The system of claim 1 , wherein the second shell is designed to interface with the second surface to provide the second engagement force to move the at least one tooth toward a second position that is specific to the second stage of the treatment plan.

7. The system of claim 1 , wherein the series of appliances includes a third appliance comprising a third shell having a plurality of cavities therein designed to receive teeth of a second jaw during the first stage of the treatment plan.

8. The system of claim 7 , wherein the attachment structure attached to at least one tooth of the first jaw comprises a first attachment structure, and wherein the system includes a second attachment structure designed to be attached to at least one tooth of the second jaw, wherein the second attachment structure includes a plurality of surfaces; and

wherein the third shell is designed to interface with a first surface of the plurality of surfaces to provide a third engagement force specific to the first stage of the treatment plan.

9. The system of claim 1 , wherein the attachment structure is attached to the at least one tooth of the first jaw such that each of the plurality of surfaces designed to apply a force thereto in a variety of orientations to provide a variety of engagement forces.

10. A non-transitory computing device readable medium having instructions stored thereon that are executable by a processor to cause a computing device to:

position an attachment structure on at least one virtual tooth of a virtual model of a jaw, wherein the attachment structure includes a plurality of surfaces arranged about a center point of the attachment structure;

activate a first subset of the plurality of surfaces of the attachment structure at a first stage of a treatment plan that is incremented in stages;

activate a second subset of the plurality of surfaces of the attachment structure at a second stage of the treatment plan according to changes to the virtual model of the jaw between the first stage of the treatment plan and the second stage of the treatment plan; and

provide the virtual model of the jaw for fabrication of physical models corresponding to the jaw at the first and the second stages of the treatment plan for formation of appliances thereover such that the appliances includes a shape designed to interface with the activated surfaces of the attachment structure.

11. The medium of claim 10 , wherein an appliance that includes the shape designed to interface the activated surfaces includes a surface designed to interface with the activated surfaces.

12. The medium of claim 10 , including instructions to:

model a first engagement force to be applied by the first subset of the plurality of surfaces of the attachment structure interfacing with a corresponding one of the appliances during the first stage of the treatment plan; and

model a second engagement force to be applied by the second subset of the plurality of surfaces of the attachment structure interfacing with a corresponding one of the appliances during the second stage of the treatment plan.

13. The medium of claim 12 , including instructions to revise at least one of a shape, a location, and an orientation of the attachment structure based on at least one of the modeled first engagement force and the modeled second engagement force.

14. The medium of claim 10 , wherein the instructions to activate the first subset of the plurality of surfaces incorporate a result of instructions to model a first number of forces used to reposition the corresponding at least one virtual tooth a first distance according to the first stage of the treatment plan.

15. The medium of claim 14 , wherein the instructions to activate the second subset of the plurality of surfaces to incorporate a result of instructions to model a second number of forces used to reposition the corresponding at least one virtual tooth a second distance according to the second stage of the treatment plan.

16. A system, comprising:

a first appliance of a series of appliances designed to incrementally implement a treatment plan, comprising a first shell having a plurality of cavities therein designed to receive teeth of a jaw in a first stage of the treatment plan;

an attachment structure designed to be attached to at least one tooth of the jaw, wherein:

the attachment structure includes a plurality of surfaces arranged about a center point of the attachment structure; and

the first shell is designed to interface with a first subset of the plurality of surfaces of the attachment structure to provide a first engagement force specific to the first stage of the treatment plan; and

a second appliance of the series of appliances, comprising a second shell having a plurality of cavities therein designed to receive teeth of the jaw in a second stage of the treatment plan;

wherein the second shell is designed to interface with a second subset of the plurality of surfaces to provide a second engagement force specific to a second stage of the treatment plan, and wherein the first engagement force and the second engagement force include different forces.

17. The system of claim 16 , wherein the first engagement force and the second engagement force include at least one of a rotational force and a linear force.

18. The system of claim 16 , wherein the plurality of surfaces of the attachment structure include at least three surfaces.

19. The system of claim 16 , wherein:

the attachment structure includes a geometric shape; and

the plurality of surfaces of the attachment structure include surfaces that are oriented normal to one another about the geometric shape.

20. The system of claim 16 , wherein:

the attachment structure includes a plurality of attachment structure components each individually designed to be attached to the at least one tooth, the plurality of attachment structures forming a geometric shape on the at least one tooth; and

the plurality of surfaces of the attachment structure include surfaces that are oriented normal to one another about the geometric shape formed by the plurality of attachment structure components.