Apparatus and method for measuring the color of teeth

• US 6,264,470 B1
• Filed: 08/12/1997
• Issued: 07/24/2001
• Est. Priority Date: 01/02/1996
• Status: Expired due to Term

• Current Assignee: RPX Corporation
• Original Assignee: LJ Laboratories L.L.C.
• Inventors: Jung, Wayne D., Jung, Russell W., Loudermilk, Alan R.
• Primary Examiner(s): Lewis, Ralph A.
• Application Number:
  US08/909,664
• Time in Patent Office: 1,442 Days
• Field of Search: 433/26, 433/29, 433/203.1, 433/116, 600/125, 600/182, 600/124, 600/477, 600/478, 356/371, 356/405, 356/406, 356/407, 356/402, 356/73
• US Class Current: 433/29
• 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 5/4547 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 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/463 Colour matching
• 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: G01N 21/474 Details of optical heads therefor, e.g. using optical fibres
• CPC Class Codes: G01N 21/57 Measuring gloss

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 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, comprising the steps of:

positioning a probe in proximity to an object, wherein he probe provides light to a surface of the object and receives light from the object, wherein the received light is coupled to one or more optical sensors, wherein data indicative of at least spectral and translucence characteristics of the object are generated by positioning of the probe in proximity to the surface of the object and without requiring the positioning of an optical implement behind the object;

generating optical characteristics data indicative of the optical characteristics of the object; and

storing the optical characteristics data in a record of a software database, wherein the software database includes a plurality of database records.

2. The method of claim 1, wherein the optical characteristics data are generated a plurality of times for a plurality of objects to generate a plurality of optical characteristics database records.

3. The method of claim 2, wherein the database records are associated with particular patients.

4. The method of claim 2, wherein the database records store pictures of the objects.

5. The method of claim 4, wherein the pictures are generated with a camera.

6. The method of claim 5, wherein the probe and the camera are integrated into a single unit.

7. The method of claim 6, wherein the probe and the camera share a common light source.

8. The method of claim 1, wherein the optical characteristics data are generated a plurality of times for the object, wherein tile database stores a historical record of the optical characteristics of the object.

9. The method of claim 1, wherein the object comprises a dental object, wherein a second dental object it produced based on the optical characteristics data.

10. The method of claim 9, wherein the second dental object comprises a denture.

11. The method of claim 9, wherein the second dental object comprises a dental prosthesis.

12. The method of claim 9, wherein the second dental object comprises a filling.

13. The method of claim 9, wherein the second dental object comprises a tooth-colored filling.

14. The method of claim 9, wherein the second dental object comprises a composite filling.

15. The method of claim 9, wherein the second dental object is produced based on a porcelain recipe determined in accordance with the optical characteristics data.

16. The method of claim 15, wherein the optical characteristics data include fluorescence data, wherein a fluorescing-type material is added to the recipe based on the fluorescence data.

17. The method of claim 15, wherein a texturing material is added to the recipe.

18. The method of claim 1, wherein a plurality of measurements are taken to generate the optical characteristics data.

19. The method of claim 18, wherein the plurality of measurements include measurements taken at first and second distances from the object.

20. The method of claim 18, wherein the plurality of measurements include a measurement taken at or about a time when an optical sensor is sensing a peak intensity value.

21. The method of claim 18, wherein the measurements include measurements indicative of an angle of the probe with respect to the surface.

22. The method of claim 1, wherein the optical characteristics data are electronically transmitted to a remote location, wherein a second object is produced at the remote location based on the transmitted optical characteristics data.

23. The method of claim 22, wherein the electronic transmission comprises a modern transmission.

24. The method of claim 22, wherein the electronic transmission comprises a facsimile transmission.

25. The method of claim 1, wherein the probe has a removable cover element.

26. The method of claim 25, wherein the removable cover element comprises a shield.

27. The method of claim 25, wherein the removable cover element is positioned on the probe prior to positioning of the probe in proximity to the object.

28. The method of claim 27, wherein the removable cover element is sterilized prior to being positioned on the probe.

29. The method of claim 1, wherein the probe has a removable tip.

30. The method of claim 29, wherein the removable tip is positioned on the probe prior to positioning of the probe in proximity to the object.

31. The method of claim 30, wherein the removable tip is sterilized prior to being positioned on the probe.

32. The method of claim 1, wherein the database includes date and time information associated with the optical characteristics data.

33. The method of claim 1, wherein the probe is positioned in proximity to the object by relative movement of the probe with respect to the object.

34. The method of claim 1, wherein the object is sectored into a plurality of sectors, wherein optical characteristics data indicative of the optical characteristics are generated for each of the plurality of sectors.

35. The method of claim 34, wherein the software database stores sectoring information with the optical characteristics data.

36. The method of claim 35, wherein the software database stores information corresponding to a pictorial representation of the tooth that includes sector grid lines.

37. A method, comprising the steps of:

sectoring a dental object of a patient into one or more sectors;

positioning a probe in proximity to the one or more sectors of the dental object, wherein the probe provides light to a surface of the dental object in each of the one or more sectors and receives light from the dental object, wherein the received light is coupled to one or more optical sensors for generating data indicative of optical characteristics of the dental object including at least spectral and translucence characteristics in each of the one or more sectors, wherein the data are generated by positioning of the probe in proximity to the surface of the dental object and without requiring the positioning of an optical implement behind the dental object; and

generating optical characteristics data indicative of the optical characteristics of the dental object in each of the one or more sectors.

38. The method of claim 37, wherein the optical characteristics data are stored in a software database record corresponding to the patient.

39. The method of claim 38, wherein the record corresponding to the patient stores a history of the optical characteristics data for the dental object.

40. The method of claim 38, wherein the record corresponding to the patient stores one or more visual representations of the dental object.

41. The method of claim 37, further comprising the step of generating a visual representation of the dental object, wherein the visual representation includes lines illustrating the one or more sectors of the dental object.

42. The method of claim 41, wherein the visual representation of the dental object comprises an image of the dental object.

43. The method of claim 42, wherein the visual representation of the dental object comprises an image generated with an intraoral camera.

44. The method of claim 42, wherein the visual representation of the dental object comprises an image generated with a camera.

45. The method of claim 44, wherein the probe and the camera are integrated into a single unit.

46. The method of claim 45, wherein the probe and the camera share a common light source.

47. The method of claim 44, wherein the optical characteristics data is displayed in an overlayed manner with the visual representation.

48. The method of claim 37, wherein the probe is positioned in proximity to the dental object by relative movement of the probe with respect to the dental object.

49. The method of claim 37, wherein the optical characteristics include spectral and translucence characteristics.

50. An apparatus comprising a probe, a spectral analysis system and a removable cover element adapted for the probe, wherein the probe measures optical properties including at least spectral properties of a dental object, the cover element being removably securable to the probe, wherein the cover element transmits light from the probe to the dental object and receives light from the dental object and transmits the received light to the probe for measurement of the spectral characteristics of the received light by the spectral analysis system, wherein the probe includes at least one source that emits broadband light on a first area of an outer surface of the dental object and at least one receiver that receives light returned from a second area of the outer surface of the dental object, wherein the measuring of the optical properties includes at least one measurement taken when the first area does not intersect with the second area, wherein the removable cover element does not adversely affect the measuring of the optical properties of the dental object.

51. The apparatus of claim 50, wherein the cover element is removably securable to the probe with a spring clip.

52. The apparatus of claim 50, wherein the cover element is removably securable to the probe with a retainer, wherein the cover element securably engages with a contoured portion of the probe.

53. The apparatus of claim 52, wherein the contoured portion of the probe comprises an indentation.

54. The apparatus of claim 53, wherein a rib is positioned in the contoured portion.

55. The apparatus of claim 50, wherein the cover element includes a transparent window through which the cover element transmits light from the probe to the object and receives light from the object and transmits the received light to the probe.

56. The apparatus of claim 55, wherein the transparent window comprises sapphire.

57. The apparatus of claim 55, wherein the transparent window comprises a hole.

58. The apparatus of claim 50, wherein the cover element is sterilizable.

59. The apparatus of claim 58, wherein the cover element is sterilizable by an autoclave or steam sterilization process.

60. An apparatus comprising a probe, a spectral analysis system and a shield for preventing infection, wherein the probe measures optical properties including at least spectral characteristics of a dental object, the shield being removably positioned on the probe, wherein the shield transmits broadband light from the probe to the dental object and receives light from the dental object and transmits the received light to the probe for measurement of the spectral characteristics of the received light by the spectral analysis system, wherein optical characteristics of the dental object are determined through the shield by positioning of the probe in proximity to the dental object, wherein the shield is adapted to cover a probe that includes at least one source that emits broadband light on a first area of an outer surface of the dental object and at least one receiver that receives light reflected from a second area of the outer surface of the dental object, wherein the measuring of the optical properties includes at least one measurement taken when the first area does not intersect with the second area, wherein the shield does not adversely affect the measuring of the optical properties of the dental object.

61. The apparatus of claim 60, wherein the optical characteristics comprise spectral and translucence characteristics.

62. The apparatus of claim 61, wherein the shield comprises a plastic material.

63. A method of producing a second dental object, comprising the steps of;

positioning a probe in proximity to a first dental object, wherein the probe provides light to a surface of the object and receives light from the first dental object, wherein the received light is coupled to one or more optical sensors for determining optical characteristics of the first dental object;

generating optical characteristics data indicative of translucence and spectral characteristics of the first dental object without requiring the positioning of an optical implement behind the first dental object;

transmitting the optical characteristics data to a remote location;

receiving the optical characteristics data at the remote location; and

producing We second dental object based on the optical characteristics data.

64. The method of claim 63, wherein the transmission and receipt of the optical characteristics data comprises a modem transmission.

65. The method of claim 63, wherein the transmission and receipt of the optical characteristics data comprises a facsimile transmission.

66. The method of claim 63, further comprising the step of generating second optical characteristics data by positioning a second probe in proximity to the second dental object.

67. The method of claim 66, further comprising the step of comparing the first optical characteristics data with the second optical characteristics data.

68. The method of claim 66, wherein the second probe comprises a probe located at the remote location.

69. The method of claim 66, wherein the second probe is the same probe that was positioned in proximity to the first dental object.

70. The method of claim 63, wherein a material mixing unit receives the optical characteristics data, wherein the material mixing unit prepares constituent materials for the second dental object based on the optical characteristics data.

71. The method of claim 63, wherein the probe is handheld.

72. The method of claim 63, wherein the probe includes a finger activated switch, wherein the optical characteristics data are generated in response to activation of the finger activated switch.

73. The method of claim 63, further comprising the step of measuring the temperature and compensating the optical characteristics data based on the measured temperature.

74. The method of claim 63, wherein the probe has a removable cover element.

75. The method of claim 74, wherein the removable cover element comprises a shield.

76. The method of claim 74, wherein the removable cover element is positioned on the probe prior to positioning of the probe in proximity to the first dental object.

77. The method of claim 76, wherein the removable cover element is sterilized prior to being positioned on the probe.

78. The method of claim 63, wherein the probe has a removable tip.

79. The method of claim 78, wherein the removable tip is positioned on the probe prior to positioning of the probe in proximity to the first dental object.

80. The method of claim 79, wherein the removable tip is sterilized prior to being positioned on the probe.

81. The method of claim 63, wherein the probe is positioned in proximity to the object by relative movement of the probe with respect to the object.

82. A method, comprising the steps of:

positioning a probe in proximity to an object, wherein the probe provides light to a surface of the object and receives light from the object, wherein the received light is coupled to one or more optical sensors for determining optical characteristics of the object, wherein information indicative of spectral and translucence characteristics of the object is determined by positioning of the probe in proximity to the surface of the object and without requiring the positioning of an optical implement behind the object;

generating optical characteristics data indicative of the optical characteristics of the object; and

generating audio information indicative of a status of the probe.

83. The method of claim 82, wherein the audio information includes information indicating that the status of the probe is that the probe is ready to take measurements.

84. The method of claim 82, wherein the audio information includes information indicating an abnormal condition.

85. The method of claim 82, wherein the audio information includes information indicating an abnormal condition of a light source.

86. The method of claim 82, wherein the audio information includes information indicative of the optical characteristics data.

87. The method of claim 82, wherein the audio information includes information indicative of a shade guide value corresponding to the optical characteristics data.

88. The method of claim 82, wherein the audio information includes information indicative of the status of the generation of the optical characteristics data.

89. The method of claim 82, wherein the audio information includes information indicating that the optical characteristics data has been accepted.

90. The method of claim 82, wherein the audio information includes information indicating that the optical characteristics data has been rejected.

91. The method of claim 82, wherein audio information is generated in response to one or more of the optical sensors detecting a peak value.

92. The method of claim 82, wherein the probe is positioned in proximity to the object by relative movement of the probe with respect to the object.

93. An apparatus comprising a probe and a positioning device for the probe, wherein the probe measures optical properties of a desired location on a dental object, the positioning device being removably positioned on the dental object, wherein the positioning device includes an opening for positioning of the probe and for transmitting light to and from a singe surface of the dental object, wherein the opening is substantially centered on the desired location and is adapted to direct the probe to the desired location on the dental object, wherein the positioning device transmits light from the probe to the desired location on the dental object and transmits light from the dental object to the probe, wherein optical characteristics of the desired location on the dental object are determinable through the positioning device by positioning of the probe in proximity to the dental object.

94. The positioning device of claim 93, wherein the positioning device comprises a black material.

95. The positioning device of claim 93, wherein the opening has a diameter larger than a diameter of the probe.

96. The positioning device of claim 93, wherein the positioning device is positioned on the object with an adhesive.

97. The positioning device of claim 93, wherein the positioning device positions the probe so as to measure the optical characteristics of the desired location on the object at different points in time.