Laser digitizer system for dental applications

• US 7,184,150 B2
• Filed: 03/19/2004
• Issued: 02/27/2007
• Est. Priority Date: 03/24/2003
• Status: Expired due to Fees

• Current Assignee: D4D Technologies L P (D4D Technologies)
• Original Assignee: D4D Technologies L P (D4D Technologies)
• Inventors: Blair, Alan, Quadling, Henley, Quadling, Mark
• Primary Examiner(s): Toatley, Jr.; Gregory J.
• Assistant Examiner(s): Stock, Jr.; Gordon J.
• Application Number:
  US10/804,694
• Publication Number:
  US 20040254476A1
• Time in Patent Office: 1,075 Days
• Field of Search: None
• US Class Current: 356/602
• CPC Class Codes: A61B 1/24 for the mouth, i.e. stomatoscopes, e.g. with tongue depressors tongue depressors per se A61B13/00; Instruments for opening or keeping open the mouth combined with saliva removers A61C17/00; mouth openers for animals A61D15/00
• CPC Class Codes: A61B 5/0066 Optical coherence imaging
• CPC Class Codes: A61B 5/0088 for oral or dental tissue
• CPC Class Codes: A61B 5/1077 Measuring of profiles
• CPC Class Codes: A61B 5/4547 Evaluating teeth
• CPC Class Codes: A61C 9/0053 Optical means or methods, e.g. scanning the teeth by a laser or light beam
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures
• CPC Class Codes: G01B 11/25 by projecting a pattern, e.g. one or more lines, moiré fringes on the object G01B11/255 takes precedence ; image analysis for depth or shape recovery G06T7/50
• CPC Class Codes: G01B 11/2518 Projection by scanning of the object

Abstract

A intra-oral laser digitizer system provides a three-dimensional visual image of a real-world object such as a dental item through a laser digitization. The laser digitizer captures an image of the object by scanning multiple portions of the object in an exposure period. The intra-oral digitizer may be inserted into an oral cavity (in vivo) to capture an image of a dental item such as a tooth, multiple teeth or dentition. The captured image is processed to generate the three-dimension visual image.

Claims

1. An intra-oral laser digitizer system comprising:

a light source having collimating optics configured to generate a collimated beam of light;

a scanner optically coupled to the light source and configured to scan the collimated beam along at least two axes to generate a pattern;

an optics relay coupled to the scanner and configured to relay the pattern towards a remote object to be imaged;

an image optics system having an optical axis configured to detect a reflection of the pattern from the remote object at an angle θ

with respect to the optics relay and to generate data representative of a surface of the object based on the reflection of the pattern; and

a processor coupled to the scanner and the image optics system configured to generate a three-dimensional image of the object based on the data.

2. The intra-oral laser digitizer of claim 1 where the light source comprises a laser LED.

3. The intra-oral laser digitizer of claim 1 where the scanner comprises a single mirror configured to scan the light along at least two-axes.

4. The intra-oral laser digitizer of claim 1 where the scanner comprises a rotatable mirror and a spinning polygon mirror.

5. The intra-oral laser digitizer of claim 1 where the scanner further comprises a programmable position controller configured to control the scan of the collimated beam of light in a programmed scan sequence.

6. The intra-oral laser digitizer of claim 1 where the pattern comprises a plurality of curves, with each curve being substantially parallel to one another.

7. The intra-oral laser digitizer of claim 1 where the light source comprises a low coherence light source.

8. The intra-oral laser digitizer of claim 1 further comprising a voice recognizer to control a given operation in response to a voice command.

9. The intra-oral laser digitizer of claim 1 where the scanner comprises a plurality of mirrors.

10. The intra-oral laser digitizer of claim 9 where the image optics system comprises:

an image sensor configured to detect a triangulation image of the object, the triangulation image based on the pattern, wherein the pattern comprises a plurality of curves generated by scanning the beam of light on the remote object during an exposure period; and

an imaging lens system configured to focus the plurality of curves on the image sensor.

11. The intra-oral laser digitizer of claim 10 where the processor is configured to merge multiple images of the remote object to generate a three-dimensional map of the remote object.

12. The intra-oral laser digitizer of claim 11 where the remote object comprises any one of:

an in vivo dental item, a dental preparation, a dental model, a dental mold, or a dental casting.

13. The intra-oral laser digitizer as described in claim 1 wherein the pattern comprises a set of segments.

14. The intra-oral laser digitizer as described in claim 13 wherein each segment is a curve.

15. The intra-oral laser digitizer as described in claim 1 wherein the image optics system comprises an image sensor, a reflecting surface that captures the reflection of the pattern, and an optics relay coupled to the reflecting surface and configured to relay the reflection of the pattern from the reflecting surface to the image sensor.

16. The intra-oral laser digitizer as described in claim 15 wherein the optics relay coupled to the reflecting surface is co-linear to the optics relay coupled to the scanner.

17. An intra-oral laser digitizer, comprising:

a light source having collimating optics configured to generate a collimated beam of light;

a scanner optically coupled to the light source and configured to scan the collimated beam along at least two axes to generate a pattern comprising a set of segments;

a first optics relay coupled to the scanner and configured to relay the pattern towards a remote object to be imaged;

a reflecting surface configured to capture a reflection of the pattern from the object at an angle θ

with respect to the first optics relay; and

a second optics relay, co-linear to the first optics relay, the second optics relay coupled to the reflecting surface and configured to relay the reflection of the pattern toward an image sensor.

18. The intra-oral laser digitizer as described in claim 17 further including a program-controlled processor that generates a representation of the object based on the reflection of the pattern as detected by the image sensor.

19. The intra-oral laser digitizer as described in claim 17 wherein the image sensor generates a first data set representative of a surface of the object based on the reflection of the pattern.

20. The intra-oral laser digitizer as described in claim 19 wherein the scanner generates a second pattern comprising a set of segments, and wherein the image sensor generates a second data set representative of a surface of the object based on a reflection of the second pattern.

21. The intra-oral laser digitizer as described in claim 20 further including a processor, under program control, to generate a three-dimensional image of the object based on the first and second data sets.

22. An intra-oral laser digitizer, comprising:

a light source having collimating optics configured to generate a collimated beam of light;

a scanner optically coupled to the light source and configured to scan the collimated beam along at least two axes;

a first optics relay coupled to the scanner and configured to relay the scanned collimated beam of light towards a remote object to be imaged, wherein over a given scanning period the scanned collimated beam of light generates a pattern comprising a set of segments;

an image sensor;

a reflecting surface configured to capture a reflection of the scanned collimated beam from the object at a given triangulation angle θ

; and

a second optics relay, co-linear to the first optics relay, the second optics relay coupled to the reflecting surface and configured to relay the reflection of the scanned collimated beam toward the image sensor, wherein over the given scanning period the reflection of the scanned collimated beam on the image sensor comprises a modified pattern.

23. The intra-oral laser digitizer as described in claim 22 further including a processor that uses the modified pattern, together with at least one other modified pattern generated as a result of scanning the collimated beam of light in a second pattern, to generate a representation of the remote object.