Laser-based support structure removal

Patent metadata

Field	Value
Publication number	US-11897205-B2
Application number	US-202217831059-A
Country	US
Kind code	B2
Filing date	Jun 2, 2022
Priority date	Jun 2, 2022
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

Systems and methods for fabricating a dental aligner are provided. The system includes a computing system to receive and prepare a digital model of a dental aligner by adding one or more support structures to the digital model. The system includes a fabrication system to manufacture the dental aligner with the one or more support structures. The system includes a laser system to receive the fabricated dental aligner, orient the dental aligner relative to the laser system, and laser cut an interface between the support structures and the dental aligner to remove the one or more support structures from the dental aligner.

First claim

What is claimed is:

1. A method comprising:
receiving, by a computing system, a first digital model of a first dental aligner configured to move one or more teeth based on a generated treatment plan;
receiving, by the computing system, a second digital model of a second dental aligner configured to move one or more teeth based on a second generated treatment plan;
preparing, by the computing system, the first digital model of the first dental aligner for manufacturing, wherein preparing the first digital model of the first dental aligner includes modifying the first digital model by adding one or more support structures to the first digital model to be formed with the first dental aligner;
preparing, by the computing system, the second digital model of the second dental aligner for manufacturing, wherein preparing the second digital model of the second dental aligner includes analyzing a size or shape of the second digital model of the second dental aligner and a size or shape of the first digital model of the first dental aligner;
forming, via additive manufacturing, the first dental aligner with the one or more support structures based on the modified first digital model;
forming, via additive manufacturing, the second dental aligner simultaneously with the first dental aligner;
receiving, by a laser system, the first dental aligner with the one or more support structures;
orienting, by the laser system, the first dental aligner with the one or more support structures relative to the laser system, wherein orienting the first dental aligner includes locating one or more features of the first dental aligner relative to the laser system; and
cutting, by the laser system, an interface between the support structures and the first dental aligner to remove the one or more support structures from the first dental aligner.

2. The method of claim 1 , wherein:
the one or more support structures includes a continuous support that extends a length along a portion of a surface of the first dental aligner;
the length is greater than 0.35 millimeters; and
cutting the interface includes making a continuous cut along the length of the continuous support.

3. The method of claim 1 , wherein forming the first dental aligner includes:
fabricating, by a fabrication system, the first dental aligner layer-by-layer at an angle relative to a normal of a surface; and
wherein the angle is in a range of 5 degrees to 45 degrees relative to the normal of the surface.

4. The method of claim 3 , wherein adding the one or more support structures to the first digital model to be formed with the first dental aligner is based on the angle of the first dental aligner relative to the normal.

5. The method of claim 3 , wherein modifying the first digital model by adding the one or more support structures to the first digital model to be formed with the first dental aligner includes:
determining, by the computing system, an attachment position of the one or more support structures relative to the first dental aligner based on the angle; and
wherein the attachment position includes at least one of an occlusal surface or an edge of the first dental aligner.

6. The method of claim 1 , wherein:
the one or more features of the first dental aligner includes at least one of a fiducial, a data matrix, or a readable indicium; and
the one or more features are positioned on at least one support structure of the first dental aligner.

7. The method of claim 1 , wherein:
the one or more support structures includes a plurality of support structures;
a first support structure of the plurality of support structures is positioned along an edge of the first dental aligner and a second support structure of the plurality of support structures is positioned towards a center of the first dental aligner; and
cutting the interface includes cutting the first support structure prior to cutting the second support structure.

8. A system comprising:
a fabrication computing system having one or more processors and memory storing instructions that, when executed by the one or more processors, cause the one or more processors to:
receive a first digital model of a first dental aligner configured to move one or more teeth based on a generated treatment plan;
receive a second digital model of a second dental aligner configured to move one or more teeth based on a second generated treatment plan;
prepare the first digital model of the first dental aligner for manufacturing, wherein preparing the first digital model of the first dental aligner includes modifying the first digital model by adding one or more support structures to the first digital model to be formed with the first dental aligner; and
prepare the second digital model of the second dental aligner for manufacturing, wherein preparing the second digital model of the second dental aligner includes analyzing a size or shape of the second digital model of the second dental aligner and a size or shape of the first digital model of the first dental aligner;

a 3D printing fabrication system configured to print the first dental aligner with the one or more support structures and the second dental aligner simultaneously; and
a laser system having one or more processors and memory storing instructions that, when executed by the one or more processors, cause the one or more processors to:
orient, by a fixture, the first dental aligner with the one or more support structures, wherein orienting the first dental aligner includes locating one or more features of the first dental aligner relative to the laser system; and
cut, by a laser beam, an interface between the support structures and the first dental aligner to remove the one or more support structures from the first dental aligner.

9. The system of claim 8 , wherein:
the one or more support structures includes a continuous support that extends a length along a portion of a surface of the first dental aligner;
the length is greater than 0.35 millimeters; and
cutting the interface includes making a continuous cut along the length of the continuous support.

10. The system of claim 8 , wherein printing the first dental aligner includes:
printing, by the 3D printing fabrication system, the first dental aligner layer-by-layer at an angle relative to normal of a surface; and
wherein the angle is in a range of 5 degrees to 45 degrees relative to the normal of the surface.

11. The system of claim 10 , wherein adding the one or more support structures to the first digital model to be formed with the first dental aligner is based on at least one of the angle of the first dental aligner relative to the normal or a position of the one or more support structures relative to the first dental aligner.

12. The system of claim 8 , wherein:
the one or more features of the first dental aligner includes at least one of a fiducial, a data matrix, or a readable indicium; and
the one or more features are positioned on at least one support structure of the first dental aligner.

13. The system of claim 10 , wherein the one or more support structures are coupled to at least one of an occlusal surface of the first dental aligner or an edge of the first dental aligner.

14. A system, comprising:
a fabrication computing system having one or more processors and memory storing instructions that, when executed by the one or more processors, cause the one or more processors to:
receive a first digital model of a first dental aligner configured to move one or more teeth based on a generated treatment plan;
receive a second digital model of a second dental aligner configured to move one o

Assignees

• Sdc Us Smilepay Spv

Inventors

• Wucher Tim
• Dargis John
• Wagnon Eric
• Marschner Drew
• Xia Charlotte
• Kreil Justin

Classifications

• B29C64/40 Primary

  Structures for supporting 3D objects during manufacture and intended to be sacrificed after completion thereof · CPC title

• A61C7/002

  Orthodontic computer assisted systems · CPC title

• A61C7/08

  Mouthpiece-type retainers {or positioners, e.g. for both the lower and upper arch (arch-shaped medicament applicators for teeth or gums A61C19/063; mouthguards for protecting the teeth of sportsmen A63B71/085)} · CPC title

• B23K26/38

  by boring or cutting · CPC title

• B29C64/182

  in parallel batches · CPC title