Aligner manufacturing methods

Patent metadata

Field	Value
Publication number	US-12583170-B1
Application number	US-202519093191-A
Country	US
Kind code	B1
Filing date	Mar 27, 2025
Priority date	Mar 15, 2019
Publication date	Mar 24, 2026
Grant date	Mar 24, 2026

Abstract

A method includes: receiving first and second digital models associated with a dental arch of a patient corresponding to first and second stages of orthodontic treatment; printing a first mold of a first dental arch based on the first digital model and a second mold of a second dental arch based on the second digital model; securing the first and second molds to a plate; heating a sheet of plastic to generate a heated sheet, and surrounding the sheet of plastic with a mask during the heating of the sheet of plastic to minimize heat transfer to other sheets of plastic; and simultaneously thermoforming the heated sheet over the first and second molds to form a first aligner shaped to fit the first dental arch and a second aligner shaped to fit the second dental arch.

First claim

What is claimed is:

1 . A method of manufacturing multiple aligners simultaneously, the method comprising:
receiving a first digital model and a second digital model associated with a dental arch of a patient corresponding to a first stage and a second stage of an orthodontic treatment; printing a first mold of a first dental arch based on the first digital model and a second mold of a second dental arch based on the second digital model; securing the first mold of the first dental arch and the second mold of the second dental arch to a plate; heating, via a heater, a sheet of plastic to generate a heated sheet, and surrounding the sheet of plastic with a mask during the heating of the sheet of plastic to minimize heat transfer to other sheets of plastic and to substantially provide a thermal seal between the heater and the sheet of plastic, wherein the mask is heat resistant up to about 500 degrees Fahrenheit; and simultaneously thermoforming the heated sheet over the first mold of the first dental arch and the second mold of the second dental arch to form a first aligner shaped to fit the first dental arch and a second aligner shaped to fit the second dental arch.

2 . The method of claim 1 further comprising:
determining whether a size of a third mold of a third dental arch is below a threshold size;
responsive to determining the size is below the threshold size, thermoforming a third aligner shaped to fit the third dental arch simultaneously with another aligner; and
responsive to determining the size is above the threshold size, thermoforming the third aligner by itself.

3 . The method of claim 1 further comprising:
piercing, using a plurality of holding pins of a pallet, the sheet of plastic to secure the sheet of plastic to the pallet during the heating and the simultaneously thermoforming.

4 . The method of claim 1 , wherein the securing of the first mold and the second mold to the plate is via:
a corresponding pin to secure a corresponding mold in an x-direction and a y-direction; a corresponding feature, wherein the corresponding mold is to be placed on the plate to cause a top portion of the corresponding feature to extend through a hole formed by the corresponding mold, wherein the top portion of the corresponding feature is to be rotated to secure the corresponding mold in a z-direction; and a corresponding keyway to maintain orientation of the corresponding mold.

5 . The method of claim 1 , wherein the securing of the first mold and the second mold to the plate is in a predetermined position, a predetermined orientation, and predetermined distances from inner walls of a thermoforming chamber.

6 . The method of claim 1 further comprising securing, using a pallet comprising a plurality of holding pins, the sheet of plastic to the pallet during the heating and during the simultaneously thermoforming, wherein the plurality of holding pins comprises a corresponding holding pin at each corner of the sheet of plastic configured to pierce the sheet of plastic.

7 . The method of claim 1 , wherein:
the mask is an insulator; the mask does not adhere to the heated sheet; and the mask comprises polytetrafluoroethylene (PTFE).

8 . A method of manufacturing multiple aligners simultaneously, the method comprising:
determining a first size of a first mold of a first dental arch and a second size of a second mold of a second dental arch; selecting a first plate, a first sheet of plastic, and a first pallet based on at least one of the first size or the second size; causing the first mold and the second mold to be secured to the first plate; causing the first sheet of plastic to be heated, by a heater, to generate a first heated sheet, and causing the first sheet of plastic to be surrounded with a mask during heating of the first sheet of plastic to minimize heat transfer to other sheets of plastic and to substantially provide a thermal seal between the heater and the first sheet of plastic, wherein the mask is heat resistant up to about 500 degrees Fahrenheit; and causing the first heated sheet to be simultaneously thermoformed over the first mold of the first dental arch and the second mold of the second dental arch to form a first aligner shaped to fit the first dental arch and a second aligner shaped to fit the second dental arch.

9 . The method of claim 8 further comprising:
determining a third size of a third mold of a third dental arch and a fourth size of a fourth mold of a fourth dental arch;
selecting a second plate, a second sheet of plastic, and a second pallet based on at least one of the third size or the fourth size, wherein the second plate has a different size than the first plate, the second sheet of plastic has a different size than the first sheet of plastic, and the second pallet has a different size than the first pallet; and
causing, using the second plate, the second sheet of plastic, and the second pallet, a third aligner and a fourth aligner to be formed.

10 . The method of claim 8 further comprising laterally moving, via a conveyor system, the first plate to a loading station to receive the first sheet of plastic, to a heating station to heat the first sheet of plastic, and to a thermoforming station to thermoform the first heated sheet.

11 . The method of claim 8 further comprising rotationally moving, via a dial system, the first plate to a loading station to receive the first sheet of plastic, to a heating station to heat the first sheet of plastic, and to a thermoforming station to thermoform the first heated sheet.

12 . The method of claim 8 , wherein the causing of the first mold and the second mold to be secured to the first plate is via:
a corresponding pin to secure a corresponding mold in an x-direction and a y-direction; a corresponding feature, wherein the corresponding mold is to be placed on the first plate to cause a top portion of the corresponding feature to extend through a hole formed by the corresponding mold, wherein the top portion of the corresponding feature is to be rotated to secure the corresponding mold in a z-direction; and a corresponding keyway to maintain orientation of the corresponding mold.

13 . The method of claim 8 , wherein the causing of the first mold and the second mold to be secured to the first plate is in a predetermined position, a predetermined orientation, and predetermined distances from inner walls of a thermoforming chamber.

14 . The method of claim 8 further comprising causing a plurality of holding pins of a pallet to pierce the first sheet of plastic to secure the first sheet of plastic to the pallet during the heating and simultaneously thermoforming, wherein the plurality of holding pins comprises a corresponding holding pin at each corner of the first sheet of plastic configured to pierce the first sheet of plastic.

15 . The method of claim 8 , wherein:
the mask is an insulator; the mask does not adhere to the heated first sheet of plastic; and the mask comprises polytetrafluoroethylene (PTFE).

16 . A method comprising:
causing a sheet of plastic to be secured between a pallet and a lower surface of a heat mask, an upper surface of the heat mask being coupled with a heater of an aligner manufacturing system, a plurality of inner sidewalls of the heat mask forming recesses, a first portion of the sheet of plastic being disposed on the pallet and exposed by the recesses of the heat mask, a second portion of the sheet of plastic being disposed on the pallet and covered by the heat mask; causing, via the heater, heat transfer to the first portion of

Assignees

• Align Technology Inc

Inventors

• Aguilar Mendez David
• Martínez González Luis Carlos
• Rito Martinez Mario Alfonso

Classifications

• B29L2031/757

  Moulds, cores, dies · CPC title

• B29C51/421

  of preforms, specially adapted for thermoforming (preheating sheets in general B29B13/023; B29C51/427 takes precedence) · CPC title

• B29C51/38

  Opening, closing or clamping means · CPC title

• B29C51/264

  Auxiliary operations prior to the thermoforming operation, e.g. cutting (B29C51/42, B29C51/46 take precedence) · CPC title

• B29C51/082 Primary

  by shaping between complementary mould parts · CPC title