摘要：
In an embodiment, a method of manufacturing customized ceramic labial/lingual orthodontic brackets by additive manufacturing may comprise measuring dentition data of a profile of teeth of a patient, based on the dentition data, creating a three-dimensional computer-assisted design (3D CAD) model of the patient's teeth, and saving the 3D CAD model, designing a virtual 3D CAD bracket structure model for a single labial or lingual bracket structure based upon said 3D CAD model, importing data related to the 3D CAD bracket structure model into an additive manufacturing machine, and directly producing the bracket with the additive manufacturing machine by layer manufacturing from an inorganic material including at least one of a ceramic, a polymer-derived ceramic, and a polymer-derived metal.
权利要求：
CA 03094102 2020-09-15 WO 2019/210015 PCT/US2019/029020 CLAIMS What is claimed is:
1. A method of manufacturing customized ceramic labial/lingual orthodontic brackets by additive manufacturing, said method comprising: measuring dentition data of a profile of teeth of a patient; based on the dentition data, creating a three-dimensional computer-assisted design (3D CAD) model of the patient's teeth, and saving the 3D CAD model; designing a virtual 3D CAD bracket structure model for a single labial or lingual bracket structure based upon said 3D CAD model; importing data related to the 3D CAD bracket structure model into an additive manufacturing machine; and directly producing the bracket with the additive manufacturing machine by layer manufacturing from an inorganic material including at least one of a ceramic, a polymer-derived ceramic, and a polymer-derived metal.
2. The method of claim 1, wherein the additive manufacturing machine uses a slurry based process.
3. The method of claim 2, wherein the slurry-based process includes at least one of lithography-based manufacturing, inkjet printing, slip casting, laser lithography additive manufacturing, direct light processing, and selective laser melting. CA 03094102 2020-09-15 WO 2019/210015 PCT/US2019/029020
4. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining at least one slot adapted to receive an archwire, including data defining a compensation angle for walls of the slot to compensate for shrinkage due to over-polymerization and achieve parallel slot walls.
5. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining a fracture wall around a perimeter of a base of the bracket.
6. The method of claim 5, wherein the fracture wall has a thickness of about 10 to about 150 lam, inclusive.
7. The method of claim 5, wherein the fracture wall is adapted so as to fracture upon application of a normal force.
8. The method of claim 7, wherein the normal force is applied in at least one of a mesial-distal direction, an occlusal-gingival direction, or to any opposite corners.
9. The method of claim 7, wherein the fracture wall is adapted to provide predictable fracture of the wall upon application of the normal force, enabling debonding of the bracket though a combination of tensile and peeling forces.
10. The method of claim 9, wherein the combination of tensile and peeling forces is less than a shear bond strength of a bonded bracket. CA 03094102 2020-09-15 WO 2019/210015 PCT/US2019/029020
11. The method of claim 7, wherein the normal force is about 10 to about
18. Newtons, inclusive.
12. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining a contour of a surface of a base of the bracket.
13. The method of claim 12, wherein the contour is adapted to a shape of a tooth to which the bracket is to be bonded.
14. The method of claim 13, wherein the contour is further adapted based on at least one of an in/out and offset of the bracket, a tip of the slot, and a torque.
15. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining a fracture groove in a base of the bracket.
16. The method of claim 15, wherein the fracture groove is in a middle vertical third of the bracket.
17. The method of claim 15, wherein the fracture groove includes a weakened area including a tooth curved depression in the bracket base in an occlusal-gingival direction. 18. The method of claim 17, wherein the fracture groove matches a contour of the tooth for that portion of the bracket positioning.
19. The method of claim 15, wherein the fracture groove is constant in depth from the tooth surface. CA 03094102 2020-09-15 WO 2019/210015 PCT/US2019/029020
20. The method of claim 19, wherein the fracture groove has a depth of about 0.10mm to about 1.2mm, inclusive.
21. The method of claim 15, wherein the fracture groove varies in depth from the tooth surface.
22. The method of claim 21, wherein the fracture groove has a variance in depth of about 1 to about 50%, inclusive, of a distance from the tooth surface to a deepest part of fracture groove.
23. The method of claim 15, wherein the fracture groove is in the middle vertical third of the bracket.
24. The method claim of 23, wherein the fracture groove has a negative draft angle.
25. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining a plurality of retentive structures in a base of the bracket.
26. The method of claim 25, wherein each retentive structure is a three- dimensional figure with a positive draft angle greater than 00 .
27. The method of claim 26, wherein each retentive structure is a three- dimensional figure selected from a group of three-dimensional figures including semi-lunar cones, full-circle cones, squares, rectangles, retentive lattices, and or meshes. CA 03094102 2020-09-15 WO 2019/210015 PCT/US2019/029020
28. The method of claim 25, wherein each retentive structure has a cross- section that is generally trapezoidal, and having a neutral plane oriented toward a tooth structure or surface that is wider than a base plane oriented toward a bracket body.
29. The method of claim 28, wherein each neutral plane is flat.
30. The method of claim 29, wherein each neutral plane is parallel to the base plane.
31. The method of claim 29, wherein at least some neutral planes are not parallel to the base plane.
32. The method of claim 29, wherein at least some neutral planes are not parallel to the base plane such that an overall pattern of the retentive structures is generally contoured to a shape of a tooth surface to which it is to be bonded.
33. The method of claim 28, wherein at least some neutral planes are contoured to a shape of a tooth surface to which it is to be bonded.
34. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining at least some corners of the bracket as being rounded.
35. The method of claim 34, wherein gingival corners of the bracket are rounded.
36. The method of claim 34, wherein the rounded corners of the bracket have a radius of curvature of about 0.05 to about 2.0 mm. CA 03094102 2020-09-15 WO 2019/210015 PCT/US2019/029020
37. The method of claim 1 wherein the bracket is adapted to be bonded to the lingual or labial surfaces of a tooth.
38. The method of claim 1 wherein the bracket is made of an inorganic material with at least one component selected from a group of materials including an oxide ceramic, a nitride ceramic, a carbide ceramic, Aluminum Oxide (A1203), Zirconium Oxide (Zr02), Alumina- toughened Zirconia (ATZ), Zirconia-toughened alumina (ZTA), Lithium disilicate, Leucite silicate and Silicon Nitride..
39. The method of claim 1, wherein the 3D CAD bracket structure model includes data defining a mesial-distal or horizontal slot adapted to receive an archwire, a vertical slot adapted to receive at least a portion of the archwire within a middle third of the bracket, or both.
40. The method of claim 39, wherein the vertical slot is further adapted to accept a digitally designed lingual multiloop wire.