Fabrication of an orthodontic aligner from a negative mold designed by a computational device

Patent metadata

Field	Value
Publication number	US-10011050-B2
Application number	US-201414318393-A
Country	US
Kind code	B2
Filing date	Jun 27, 2014
Priority date	Oct 12, 2011
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

Provided is a method in which a computational device generates a design of a negative mold of teeth. The negative mold of the teeth is fabricated from the design of the negative mold. An aligner is formed using the fabricated negative mold. Provided also is a negative mold of teeth for fabricating a positive model of the teeth for an aligner. The negative mold comprises a tooth surface, and an identity tracking entity coupled to the tooth surface to provide identification.

First claim

What is claimed is:

1. A method of manufacturing an orthodontic aligner for a patient, comprising:
generating, via a computational device, a design of a negative mold of the patient's teeth, the design including a digital data set having identification information to at least identify the patient;
fabricating a negative mold of the patient's teeth from the design with an identity tracking entity, including the identification information, exposed at a surface of the negative mold;
forming an aligner using the fabricated negative mold;
after forming the aligner, scanning the identification information; and
modifying the formed aligner based on the scanned identification information.

2. The method of claim 1 , wherein forming the aligner includes:
generating a positive model of the teeth from the fabricated negative mold with the identification information being transferred to the positive model via the identity tracking entity; and
thermoforming the aligner over the positive model.

3. The method of claim 2 , wherein the negative mold corresponds to a mold, and the positive model corresponds to a cast.

4. The method of claim 2 , wherein the identity tracking entity is a data matrix and pixel types on the data matrix are spherical, rectangular, or cylindrical, and are spaced adequately and are of a size that satisfies conditions for transference of the data matrix from the negative mold to the positive model.

5. The method of claim 2 , wherein the identity tracking entity is a data matrix and pixels on the data matrix are tapered for retaining the data matrix on the positive model when the negative mold is separated from the positive model.

6. The method of claim 2 , wherein scanning includes scanning, via a scanner, the identification information transferred to the positive model; and modifying includes printing the scanned identification by a laser marker on the thermoformed aligner.

7. The method of claim 2 , wherein scanning includes scanning, via a scanner, the identification information transferred to the positive model; and modifying includes trimming the thermoformed aligner via a laser trimmer.

8. The method of claim 2 , wherein the negative mold has one or more positioning posts to determine position and orientation when the thermoformed aligner is subjected to laser marking and laser trimming, and one or more accuracy markers to determine whether the negative mold has been fabricated with proper dimensions.

9. The method of claim 3 , wherein fabricating the negative mold is performed by a rapid prototyping machine; and generating the positive model includes transferring material into the negative mold.

10. The method of claim 9 , wherein the negative mold includes one or more positioning posts; and at least two accuracy markers.

11. The method of claim 10 , wherein the negative mold further includes
a base boundary surface;
a rim surface;
a mold sitting feature; and
a spillway to remove excess transferred liquid material that hardens over time to form the positive model.

12. The method of claim 10 , wherein low density build supports are built from a rapid prototyping machine platform to the design platform to support the design platform that supports pixels of the identity tracking entity.

13. The method of claim 1 , wherein the identity tracking entity is selected from a group consisting of a text, a three dimensional barcode, a data matrix, a quick response (QR) code, and a radio frequency identification (RFID) tag.

14. The method of claim 1 , wherein the identity tracking entity is fabricated as one positive model.

15. The method of claim 1 , wherein the identity tracking entity is fabricated as one negative mold.

16. The method of claim 1 , wherein a plurality of identity tracking entities are fabricated to provide redundancy and are coupled to the negative mold.

17. The method of claim 1 , wherein the identity tracking entity is built as a separate mold and attached to the negative mold.

18. The method of claim 1 , wherein the negative mold does not have a center piece.

19. The method of claim 1 , wherein a mold sitting feature supports the negative mold of the teeth.

20. The method of claim 1 , the method further comprising:
fabricating the negative mold in a plurality of sections.

21. The method of claim 1 , wherein a plurality of interleaved negative molds that have no center pieces are fabricated by a rapid prototyping machine, and wherein the rapid prototyping machine receives the design of the negative mold of the teeth and no design of a positive model of the teeth.

22. The method of claim 1 , wherein modifying includes at least one of printing information on the formed aligner based on the scanned identification information and trimming the formed aligner based on the scanned identification information.

23. A method, comprising:
generating, via a computational device, a design of a negative mold of teeth, wherein the design is a digital data set and identification information is associated with the digital data set;
fabricating, by a rapid prototyping machine, the negative mold of the teeth from the design of the negative mold, wherein the negative mold corresponds to a mold and is comprised of an identity tracking entity to provide the identification information; and
generating a positive model of the teeth from the fabricated negative mold by transferring material into the negative mold, wherein the positive model corresponds to a cast and the identity tracking entity is transferred to the positive model; and
thermoforming an aligner over the positive model.

Assignees

• Ormco Corp

Inventors

• Kitching Ian D
• Zhang Hua
• Do Tuan A
• Phelps Kenneth A
• Tsai Yi-Feng

Classifications

• B29C41/02

  for making articles of definite length, i.e. discrete articles · CPC title

• B29C33/3835

  Designing moulds, e.g. using CAD-CAM · CPC title

• A61C7/36

  Devices acting between upper and lower teeth · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B29C33/3878

  used as masters for making successive impressions · CPC title