Methods for determining color or shade information of a dental object using an image generation device without operator identification of the position of a reference implement in the field of view of the image generation device

• US 7,097,450 B2
• Filed: 04/04/2003
• Issued: 08/29/2006
• Est. Priority Date: 01/02/1996
• Status: Expired due to Fees

• Current Assignee: RPX Corporation
• Original Assignee: JJL Technologies, L.L.C.
• Inventors: Jung, Wayne D., Jung, Russell W., Loudermilk, Alan R.
• Primary Examiner(s): Wilson, John J
• Application Number:
  US10/407,624
• Publication Number:
  US 20040043350A1
• Time in Patent Office: 1,243 Days
• Field of Search: 433/26, 433/29, 433/116, 433/203.1, 600124-125, 600/182, 600477-478, 356/371, 356/402, 356405-407
• US Class Current: 433/26
• CPC Class Codes: A61B 2560/0233 Optical standards
• CPC Class Codes: A61B 2562/247 Hygienic covers, i.e. for covering the sensor or apparatus during use
• CPC Class Codes: A61B 5/0088 for oral or dental tissue
• CPC Class Codes: A61B 5/061 Determining position of a probe within the body employing means separate from the probe, e.g. sensing internal probe position employing impedance electrodes on the surface of the body A61B1/00158 takes precedence
• CPC Class Codes: A61B 5/4547 Evaluating teeth
• CPC Class Codes: A61C 19/04 Measuring instruments specially adapted for dentistry A61C5/44 takes precedence; testing vitality of teeth A61B5/0534; radiation diagnosis specially adapted for dentistry A61B6/51
• CPC Class Codes: A61C 19/10 Supports for artificial teeth for transport or for comparison of the colour
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/0278 Control or determination of height or angle information for sensors or receivers
• CPC Class Codes: G01J 3/0291 Housings; Spectrometer accessories; Spatial arrangement of elements, e.g. folded path arrangements
• CPC Class Codes: G01J 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/508 measuring the colour of teeth
• CPC Class Codes: G01J 3/51 using colour filters
• CPC Class Codes: G01J 3/513 having fixed filter-detector pairs
• CPC Class Codes: G01J 3/52 using colour charts

Abstract

Color measuring systems and methods such as for determining the color or other characteristics of teeth are disclosed. Perimeter receiver fiber optics are spaced apart from a central source fiber optic and receive light reflected from the surface of the object/tooth being measured. Light from the perimeter fiber optics pass to a variety of filters. The system utilizes the perimeter receiver fiber optics to determine information regarding the height and angle of the probe with respect to the object/tooth being measured. Under processor control, the color measurement may be made at a predetermined height and angle. Various color spectral photometer arrangements are disclosed. Translucency, fluorescence and/or surface texture data also may be obtained. Audio feedback may be provided to guide operator use of the system. The probe may have a removable or shielded tip for contamination prevention. A method of producing dental prostheses based on measured data also is disclosed. Measured data also may be stored and/or organized as part of a patient data base.

Claims

1. A method including the determination of shade information of a dental object in a patient'"'"'s mouth, comprising the steps of:

determining color information of the dental object, wherein the color information is determined by;

generating data of the dental object with an image generation device having a field of view, wherein the dental object and a reference implement having one or more regions of predetermined optical properties are positioned in the field of view of the image generation device, wherein the reference implement is adapted for use near the dental object in the patient'"'"'s mouth;

generating data of the reference implement with the image generation device, wherein the reference implement includes a positional location attribute, wherein based on the positional location attribute a position of the one or more regions of predetermined optical properties of the reference implement in the field of view of the image generation device is determined by a processing system without operator identification of the position in the field of view of the image generation device;

generating color information of the dental object by adjusting the data generated of the dental object based on the data generated of the reference implement; and

determining shade information of the dental object, wherein the color information is used to determine a closest match or matches of shade values in one or more regions of the dental object, wherein data for the shade values are stored in memory accessed by the processing system.

2. The method of claim 1, wherein the color information comprises value, chroma and hue information.

3. The method of claim 2, wherein the color information is transmitted to a dental fabrication location, wherein the dental fabrication location produces a second dental object based on the color information.

4. The method of claim 1, wherein the color information comprises RGB values, XYZ coordinates, or Lab values.

5. The method of claim 1, wherein the shade information is transmitted to a dental fabrication location, wherein the dental fabrication location produces a second dental object based on the shade information.

6. The method of claim 5, wherein the shade information is transmitted to the dental fabrication facility electronically.

7. The method of claim 6, wherein the shade information is transmitted via a telecommunication channel or over a LAN or WAN.

8. The method of claim 5, wherein shade information or color information is determined for the second dental object, wherein at least color information of the second dental object is determined in accordance with the following steps:

generating data of the second dental object with a second image generation device having a field of view;

generating data of a second reference implement of predetermined optical properties with the second image generation device, wherein the second reference implement includes a positional location attribute, wherein based on the positional location attribute the position of the second reference implement in the field of view of the second image generation device is determined by a second processing system without operator identification of the position of the second reference implement in the field of view of the second image generation device;

generating color information of the second dental object by adjusting the data generated of the second dental object based on the data generated of the second reference implement.

9. The method of claim 5, wherein shade information of the second dental object is determined prior to installation of the second dental object in the patient'"'"'s mouth.

10. The method of claim 1, wherein the shade information is stored in a database, wherein the shade information is generated for a plurality of dental objects to generate a plurality of database records.

11. The method of claim 10, wherein the database records store pictures of the dental objects, wherein the pictures of the dental objects comprise images of the dental objects captured with the image generation device.

12. The method of claim 1, wherein the shade information is generated for a plurality of regions of the dental object.

13. The method of claim 1, wherein the processing system posturizes an image of the dental object into one or more regions of substantially common optical characteristics.

14. The method of claim 13, wherein the processing system posturizes the image of the dental object based in part on limiting a number of levels of the color information.

15. The method of claim 13, wherein the processing system posturizes the image of the dental object based in part on limiting a number of gray levels of the color information.

16. The method of claim 1, wherein the image generation device comprises a camera.

17. The method of claim 1, wherein data corresponding to a plurality of shade guide systems are stored, each of the plurality of shade guide systems having a plurality of shade guide values, wherein the shade information is output in the form of a closest match or matches to one or more of the shade guide values in the plurality of shade guide systems.

18. The method of claim 17, wherein the shade information is output in the form of the closest match to one of the shade guide values in the plurality of shade guide systems.

19. The method of claim 1, wherein the shade information is used to electronically output a proposed recipe of materials for preparing a second dental object.

20. The method of claim 19, wherein the shade information is used to electronically output a proposed recipe of materials and instruction information for preparing a second dental object.

21. The method of claim 1, wherein an image of the dental object is displayed, wherein data indicative of the shade information of the dental object in one or more particular regions is displayed in an overlaid maimer over the one or more particular regions.

22. The method of claim 1, wherein the dental object and the reference implement are positioned so as to be subject to a substantially corresponding lighting condition.

23. The method of claim 1, wherein the reference implement is positioned in or substantially in the patient'"'"'s mouth and are simultaneously in the field of view of the image generation device.

24. A method including the determination of color information of a dental object in a patient'"'"'s mouth, comprising the steps of:

determining color information of the dental object, wherein the color information is determined by;

generating data of the dental object with an image generation device having a field of view, wherein the dental object and a reference implement having one or more regions of predetermined optical properties are positioned in the field of view of the image generation device, wherein the reference implement is adapted for use near the dental object in the patient'"'"'s mouth;

generating data of the reference implement with the image generation device, wherein the reference implement includes a positional location attribute, wherein based on the positional location attribute a position of the one or more regions of predetermined optical properties of the reference implement in the field of view of the image generation device is determined by a processing system without operator identification of the position of the reference implement in the field of view of the image generation device;

generating color information of the dental object by adjusting the data generated of the dental object based on the data generated of the reference implement; and

outputting the color information of the dental object for one or more regions of the dental object.

25. The method of claim 24, wherein the color information comprises value, chroma and hue information.

26. The method of claim 24, wherein the color information is transmitted to a dental fabrication location, wherein the dental fabrication location produces a second dental object based on the color information.

27. The method of claim 26, wherein the color information is transmitted via a telecommunication channel or over a LAN or WAN.

28. The method of claim 26, wherein color information is determined for the second dental object, wherein at least color information of the second dental object is determined in accordance with the following steps:

generating data of the second dental object with a second image generation device having a field of view;

generating data of a second reference implement of predetermined optical properties with the second image generation device, wherein the second reference implement includes a positional location attribute, wherein based on the positional location attribute the position of the second reference implement in the field of view of the second image generation device is determined by a second processing system without operator identification of the position of the second reference implement in the field of view of the second image generation device;

generating color information of the second dental object by adjusting the data generated of the second dental object based on the data generated of the second reference implement.

29. The method of claim 26, wherein color information of the second dental object is determined prior to installation of the second dental object in the patient'"'"'s mouth.

30. The method of claim 24, wherein the color information comprises RGB values, XYZ coordinates, or Lab values.

31. The method of claim 24, wherein the color information is stored in a database, wherein the color information is generated for a plurality of dental objects to generate a plurality of database records.

32. The method of claim 31, wherein the database records store pictures of the dental objects, wherein the pictures of the dental objects comprise images of the dental objects captured with the image generation device.

33. The method of claim 24, wherein the color information is generated for a plurality of regions of the dental object.

34. The method of claim 24, wherein the processing system posturizes an image of the dental object into one or more regions of substantially the same color.

35. The method of claim 34, wherein the processing system posturizes the image of the dental object based in pan on limiting a number of levels of the color information.

36. The method of claim 34, wherein the processing system posturizes the image of the dental object based in part on limiting a number of gray levels of the color information.

37. The method of claim 24, wherein the image generation device comprises a camera.

38. The method of claim 24, wherein data corresponding to a plurality of shade guide systems are stored, each of the plurality of shade guide systems having a plurality of shade guide values, wherein shade information is output in the form of a closest match or matches to one or more of the shade guide values in the plurality of shade guide systems.

39. The method of claim 38, wherein the shade information is output in the form of the closest match to one of the shade guide values in the plurality of shade guide systems.

40. The method of claim 24, wherein the color information is used to electronically output a proposed recipe of materials for preparing a second dental object.

41. The method of claim 40, wherein the color information is used to electronically output a proposed recipe of materials and instruction information for preparing a second dental object.

42. The method of claim 24, wherein an image of the dental object is displayed, wherein data indicative of the color information of the dental object in one or more particular regions is displayed in an overlaid manner ova the one or more particular regions.

43. The method of claim 24, wherein the dental abject and the reference implement are positioned so as to be subject to a substantially corresponding lighting condition.

44. The method of claim 24, wherein the reference implement is positioned in or substantially in the patient'"'"'s mouth and are simultaneously in the field of view of the image generation device.