Palatal contour anchorage
An orthodontic alignment device can have a palatal contour anchorage (PCA) feature that generally matches the shape of the patient's hard pallet. This PCA feature may be built slightly off-set to deliberately push against the patient's palate and/or gingiva to provide anchorage support of staged translation of the teeth. By transferring the required anchorage away from the teeth and onto the palate, through the PCA feature, the adjacent teeth are no longer subjected to unwanted side effects of reaction forces.
1. An orthodontic alignment system including a series of dental appliances configured to apply forces to a patient's teeth according to a treatment plan, the system comprising:
a first dental appliance configured to apply forces to the patient's teeth according to a first stage of the treatment plan, the first dental appliance including:
a tooth portion having a dentition-receiving cavity configured to be placed over one or more of the patient's teeth; and
an anchorage portion extending from the tooth portion and configured to abut the patient's gingiva, palate, or gingiva and palate within the patient's mouth, wherein the anchorage portion includes an offset portion having an offset shape with respect to at least a portion of a surface contour of the patient's gingiva, palate, or gingiva and palate, wherein the offset shape is configured to exert a reaction force on an anterior portion of the patient's hard palate to generate a distalizing force against one or more molars of the one or more of the patient's teeth or to push one or more anterior teeth of the one or more of the patient's teeth outward according to the first stage of the treatment plan; and
a second dental appliance configured to apply forces to the patient's teeth according to a second stage of the treatment plan, wherein the second dental appliance is configured to apply less force on the anterior portion of the patient's hard palate than the first dental appliance.
2. The system of claim 1 , wherein the anchorage portion has a portion that matches at least a portion of the surface contour of the patient's gingiva, palate, or gingiva and palate within the patient's mouth.
3. The system of claim 1 , wherein the anchorage portion has a surface area configured to disperse the reaction force such that the anchorage portion is configured to exert less than a predetermined amount of pressure against the patient's gingiva, palate, or gingiva and palate.
4. The system of claim 3 , wherein the predetermined amount of pressure is a pressure that causes tissue damage to the patient's gingiva, palate, or gingiva and palate within the patient's mouth.
5. The system of claim 4 , wherein the tissue damage is capillary damage, desquamation, or necrosis.
6. The system of claim 1 , wherein the offset shape is offset with respect to a surface contour of a portion of a hard palate portion of the palate.
7. The system of claim 1 , wherein the offset shape is offset with respect to a surface contour of a portion of a buccal gingiva portion of the patient's gingiva.
8. The system of claim 1 , wherein the offset shape is offset with respect to a surface contour of a portion of a lingual gingiva portion of the patient's gingiva.
9. The system of claim 1 , wherein the anchorage portion comprises a temporary anchorage device receptacle for receiving a portion of an implanted temporary anchorage device.
10. The system of claim 1 , wherein the tooth portion comprises one or more anchor receptacles configured to receive anchors that have been attached to one or more of the patient's teeth.
11. The system of claim 1 , wherein the second dental appliance includes a second anchorage portion having one or more of a location, a size, and a shape that is different than one or more of a location, a size, and a shape of the anchorage portion of the first dental appliance.
12. The system of claim 1 , wherein the second dental appliance includes:
a second tooth portion having a second dentition-receiving cavity configured to be placed over the one or more of the patient's teeth; and
a second anchorage portion extending from the second tooth portion and configured to abut the patient's gingiva, palate, or gingiva and palate, wherein the second anchorage portion is configured to exert a second reaction force on a second location of the patient's gingiva, palate, or gingiva and palate within the patient's mouth that balances at least in part forces applied to the patient's teeth according to the second stage of the treatment plan.
13. The system of claim 1 , wherein the offset shape is offset with respect to the at least a portion of the surface contour of the patient's gingiva, palate, or gingiva and palate in one or more of an x-axis, a y-axis, and a z-axis.
14. The system of claim 1 , wherein the offset shape is configured to exert the reaction force with a sufficient vertical component with respect to the patient's palate to balance an extrusion force applied to one or more teeth by the tooth portion of the first dental appliance.
15. The system of claim 1 , wherein the anchorage portion is configured to span the patient's palate.
16. A method for moving one or more teeth of a patient using an orthodontic alignment system including a series of dental appliances configured to apply forces to a patient's teeth according to a treatment plan, the method comprising:
placing a tooth region of a first dental appliance over the one or more teeth of the patient, the first dental appliance configured to apply forces to the patient's teeth according to a first stage of the treatment plan, wherein the tooth region comprises a concave surface for receiving the one or more teeth of the patient, further wherein the first dental appliance comprises an anchor portion extending from the tooth region and configured to abut the patient's gingiva, palate, or gingiva and palate, the anchor portion including an offset portion having an offset shape with respect to a surface contour of the patient's gingiva, palate, or gingiva and palate;
exerting, with the tooth region, one or more forces on the one or more teeth of the patient;
exerting, with the offset shape of the anchor portion, a reaction force against an anterior portion of the patient's hard palate to generate a distalizing force against one or more molars of the one or more of the patient's teeth or to push one or more anterior teeth of the one or more of the patient's teeth outward;
moving the one or more teeth of the patient using the first dental appliance; and
placing second dental appliance over the one or more teeth of the patient to apply forces to the patient's teeth according to a second stage of the treatment plan, wherein the second dental appliance is configured to apply less force on the anterior portion of the patient's hard palate than the first dental appliance.
17. The method of claim 16 , further comprising dispersing the reaction force over a surface area of the patient's hard palate.
18. The method of claim 16 , wherein exerting the one or more forces on the one or more teeth comprises exerting a rotation force on a tooth that is configured to rotate the tooth.
19. The method of claim 18 , wherein the reaction force is further exerted against a lingual gingiva portion or a buccal gingiva portion of the patient's gingiva.
20. The method of claim 16 , wherein exerting the one or more forces on the one or more teeth comprises exerting an extrusion force on the one or more teeth.
21. The method of claim 16 , wherein exerting the one or more forces on the one or more teeth comprises exerting a tipping force on the one or more teeth.
22. The method of claim 16 , wherein the reaction force is applied to a hard palate portion of the palate to push the one or more anterior teeth outward.
23. The method of claim 16 , wherein the second dental appliance includes a second anchor portion having one or more of a location, a size, and a shape that is different than one or more of a location, a size, and a shape of the anchor portion of the first dental appliance.
24. The method of claim 16 , wherein the anchor portion spans the patient's palate.