Dental imaging instrument having an air stream auxiliary

• US 9,937,021 B2
• Filed: 05/18/2016
• Issued: 04/10/2018
• Est. Priority Date: 06/18/2002
• Status: Active Grant

• Current Assignee: Align Technology Incorporated
• Original Assignee: Align Technology Incorporated
• Inventors: Babayoff, Noam, Taub, Eldad, Kopelman, Avi
• Primary Examiner(s): EIDE, HEIDI MARIE
• Application Number:
  US15/158,366
• Publication Number:
  US 20160256244A1
• Time in Patent Office: 692 Days
• CPC Class Codes: A61B 1/253 with means for preventing fogging
• CPC Class Codes: A61C 17/0208 combined with means providing suction A61C17/0211 takes precedence
• CPC Class Codes: A61C 17/022 Air-blowing devices , e.g. with means for heating the air
• CPC Class Codes: A61C 9/006 projecting one or more stripes or patterns on the teeth

Abstract

A dental instrument and method for imaging the three-dimensional topography of one or more teeth in the oral cavity of an individual is provided. The instrument includes a probe insertable into the oral cavity to receive the image of these surfaces which can then be processed. Combined with the probe is an auxiliary which projects an air stream toward the surface to be imaged by the probe and acts to evaporate and remove from these surfaces a liquid film coating formed by saliva and other fluids present in the oral cavity, to render these surfaces dry and to enhance their reflectivity and in doing so, provide clearer images.

Claims

1. A dental instrument for determining three dimensional (3D) topography of one or more teeth, said instrument comprising:

a probe for scanning the one or more teeth so as to capture an image of surfaces of the one or more teeth in order to determine 3D topography of the surfaces of the one or more teeth by processing the image, said probe comprising a light source to generate an array of light beams, confocal optics to focus the array of light beams, a detector to detect light from the array of light beams that is reflected by the one or more teeth, so as to capture the image of the surfaces or the one or more teeth, and an external optical surface of the probe between the confocal optics and the one or more teeth; and

an auxiliary coupled to the probe so as to direct a first stream of only gas over the teeth surfaces while also directing a second stream of only gas over the external optical surface of the probe, the auxiliary being coupled to the probe such that gas from the first stream is provided to the one or more teeth while scanning to clear material from the teeth surfaces and dry the teeth surfaces, so as to improve the image.

2. The instrument according to claim 1, wherein the first stream of only gas is emitted under positive pressure towards said teeth surfaces.

3. The instrument according to claim 2, wherein said gas is air.

4. The instrument according to claim 2, wherein the first stream of only gas is at a temperature above body temperature.

5. The instrument according to claim 2, wherein the auxiliary is coupled to an air compressor configured to produce positive pressure.

6. The instrument according to claim 1, wherein the first stream of only gas is under negative-pressure.

7. The instrument according to claim 6, wherein the auxiliary is coupled to a vacuum pump configured to produce negative pressure.

8. The instrument according to claim 1, wherein the auxiliary includes a pair of nozzles mounted on opposite sides of the probe.

9. The instrument according to claim 8, wherein the nozzles are oriented so that one nozzle produces the first stream of only gas on the surface of the one or more teeth to be imaged, and the other nozzle produces the second stream of only gas over the external optical surface of the probe.

10. A method for determining a three-dimensional (3D) surface topography of a tooth surface, the method comprising:

bringing into proximity of the tooth surface a probe comprising a light source to generate an array of light beams, confocal optics to focus the array of light beams, and a detector to detect light from the array of light beams that is reflected by the tooth surface;

acquiring an image of the tooth surface with the probe to determine 3D topography of the tooth surface by processing the image; and

flowing a first stream of only gas over the tooth surface using an auxiliary coupled to the probe while flowing a second stream of only gas over an external optical surface of the probe, the auxiliary being coupled to the probe such that only gas from the first stream is provided to the tooth surface while acquiring the image to clear material from the tooth surface and dry the tooth surface, so as to improve the image.

11. The method according to claim 10, wherein the first stream of only gas is emitted under positive pressure towards the tooth surface.

12. The method according to claim 11, wherein said gas is air.

13. The method according to claim 10, wherein the first stream of only gas is under negative-pressure.

14. The method according to claim 10, wherein the first stream of only gas is at a temperature above body temperature.

15. The method according to claim 10, further comprising processing the image to produce digital data associated with the 3D topography of the tooth surface.

16. A dental instrument for determining the topography of one or more teeth, said instrument comprising:

a hand-held probe for scanning the one or more teeth so as to capture an image of surfaces of the one or more teeth in order to determine topography of the one or more teeth by processing the image, said probe comprising a light source to generate an array of light beams, confocal optics to focus the array of light beams, and a detector to detect light from the array of light beams that is reflected by the one or more teeth, so as to capture the image of the surfaces or the one or more teeth; and

an auxiliary coupled to the hand-held probe so as to direct a first stream of only gas over the teeth surfaces while a second stream of only gas is directed to an external optical sensing surface, the auxiliary being coupled to the probe such that only gas is provided to the one or more teeth while scanning to clear material from the teeth surfaces and dry the teeth surfaces, so as to improve the image.