Apparatus and method for measuring the color of teeth

• US 5,851,113 A
• Filed: 08/12/1997
• Issued: 12/22/1998
• 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): WEHNER, CARY ELLEN
• Application Number:
  US08/909,991
• Time in Patent Office: 497 Days
• Field of Search: 433/26, 433/29, 433/203.1, 433/116, 600/124, 600/125, 600/182, 600/477, 600/478, 356/371, 356/402, 356/405, 356/406, 356/407
• 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 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, comprising the steps of:

positioning a probe in proximity to a dental object, wherein the probe provides light to a surface of the dental object from one or more light sources, and receives light from the dental object through a plurality of light receivers, wherein light from the light receivers is coupled to one or more optical sensors;

taking a plurality of measurements with the one or more optical sensors; and

determining at least a peak intensity of received light based on the measurements as the probe is a distance away from the surface of the dental object, and determining at least an intensity of light as the probe is at or about the surface of the dental object, wherein translucence data and color data are generated based on at least the peak intensity and the intensity.

2. The method of claim 1, further comprising the step of generating fluorescence data or surface texture data based on the measurements.

3. The method of claim 1, further comprising the step of displaying a representation of the translucence data or the color data on a display device.

4. The method of claim 1, further comprising the step of generating audio information, wherein the audio information is indicative of the status of the measurements.

5. The method of claim 1, wherein a material mixing unit receives data indicative of translucence or color characteristics of the dental object, wherein the material mixing unit prepares constituent materials for a second dental object based on the data indicative of the translucence or color characteristics, wherein the constituent materials of the second dental object are selected based on the data indicative of the translucence or color characteristics.

6. The method of claim 1, wherein the color data are adjusted based on the translucence data.

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

8. The method of claim 7, wherein the database records are associated with particular patients.

9. The method of claim 7, wherein the database records store pictures of the dental objects.

10. The method of claim 9, wherein the pictures are generated with a camera.

11. The method of claim 10, wherein the probe and the camera are integrated into a single unit.

12. The method of claim 10, wherein the probe and the camera share a common light source.

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

14. The method of claim 1, wherein a second dental object is produced based on color data and translucence data.

15. The method of claim 14, wherein the second dental object comprises a denture.

16. The method of claim 14, wherein the second dental object comprises a dental prosthesis.

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

18. The method of claim 14, wherein the second dental object comprises a tooth-colored filling.

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

20. The method of claim 14, wherein the second dental object is produced based on a porcelain recipe determined in accordance with the color data and translucence data.

21. The method of claim 20, further comprising the step of generating fluorescence data, wherein a fluorescing-type material is added to the recipe based on the fluorescence data.

22. The method of claim 20, wherein a texturing material is added to the recipe.

23. The method of claim 1, wherein the plurality of measurements include measurements taken at first and second distances from the dental object.

24. The method of claim 1, wherein the plurality of measurements include a measurement taken at or about a time when an optical sensor is sensing a peak intensity value.

25. The method of claim 1, wherein the plurality of measurements include measurements indicative of an angle of the probe with respect to the surface.

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

27. The method of claim 26, wherein the electronic transmission comprises a modem transmission.

28. The method of claim 26, wherein the electronic transmission comprises a facsimile transmission.

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

30. The method of claim 29, wherein the removable cover element comprises a shield.

31. The method of claim 29, wherein the removable cover element is positioned on the probe prior to positioning of the probe in proximity to the dental object.

32. The method of claim 31, wherein the removable cover element is sterilized prior to being positioned on the probe.

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

34. The method of claim 33, wherein the removable tip is positioned on the probe prior to positioning of the probe in proximity to the dental object.

35. The method of claim 34, wherein the removable tip is sterilized prior to being positioned on the probe.

36. The method of claim 1, wherein optical characteristics data are stored in a database, wherein the database includes date and time information associated with the optical characteristics data.

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

38. The method of claim 1, wherein a source emits light on a first area of the dental object, wherein a receiver receives light reflected from a second area of the dental object, wherein the step of taking a plurality of measurements includes at least one measurement taken when the first area does not intersect with the second area, wherein the measurement generates data indicative of translucence characteristics of the object.

39. The method of claim 1, wherein the step of taking a plurality of measurements includes one measurement taken when the probe is in contact or near contact with the dental object, wherein the measurement generates data indicative of translucence characteristics of the dental object.

40. A method, comprising the steps of:

positioning a probe in proximity to a dental object, wherein the probe provides light to a surface of the dental object from one or more light sources, and receives light from the dental object through a plurality of light receivers; and

determining the intensity of reflected light received by more than one of the light receivers with second sensors, and measuring the optical characteristics of the dental object with first sensors based on light received by one or more of the light receivers in response to the intensity determinations made by the second sensors, wherein the measurement produces data indicative of the optical characteristics of the dental object.

41. The method of claim 40, wherein the optical characteristics comprise color characteristics.

42. The method of claim 40, wherein the optical characteristics comprise translucence characteristics.

43. The method of claim 40, wherein the optical characteristics comprise fluorescence characteristics.

44. The method of claim 40, wherein the optical characteristics comprise surface texture characteristics.

45. The method of claim 40, further comprising the step of displaying a representation of the optical characteristics on a display device.

46. The method of claim 40, further comprising the step of generating audio information, wherein the audio information is indicative of the status of the optical characteristics measurement.

47. The method of claim 40, wherein a material mixing unit receives data indicative of the optical characteristics, wherein the material mixing unit prepares constituent materials for a second dental object based on the data indicative of the optical characteristics, wherein the constituent materials of the second dental object are selected based on the data indicative of the optical characteristics.

48. The method of claim 40, wherein optical characteristics are determined by the steps of generating first data indicative of color characteristics and generating second data indicative of translucence characteristics, wherein the first data are adjusted based on the second data.

49. The method of claim 40, wherein optical characteristics data are generated a plurality of times for a plurality of dental objects to generate a plurality of database records.

50. The method of claim 49, wherein the database records are associated with particular patients.

51. The method of claim 49, wherein the database records store pictures of the dental objects.

52. The method of claim 51, wherein the pictures are generated with a camera.

53. The method of claim 52, wherein the probe and the camera are integrated into a single unit.

54. The method of claim 52, wherein the probe and the camera share a common light source.

55. The method of claim 40, wherein optical characteristics data are generated a plurality of times for the dental object, wherein a database stores a historical record of the optical characteristics of the dental object.

56. The method of claim 40, wherein a second dental object is produced based on optical characteristics data.

57. The method of claim 56, wherein the second dental object comprises a denture.

58. The method of claim 56, wherein the second dental object comprises a dental prosthesis.

59. The method of claim 56, wherein the second dental object comprises a filling.

60. The method of claim 56, wherein the second dental object comprises a tooth-colored filling.

61. The method of claim 56, wherein the second dental object comprises a composite filling.

62. The method of claim 56, wherein the second dental object is produced based on a porcelain recipe determined in accordance with optical characteristics data.

63. The method of claim 62, wherein the optical characteristics data include fluorescence data, wherein a fluorescing-type material is added to the recipe based on the fluorescence data.

64. The method of claim 62, wherein a texturing material is added to the recipe.

65. The method of claim 40, wherein the measurement includes measurements taken at first and second distances from the dental object.

66. The method of claim 40, wherein the measurement includes a measurement taken at or about a time when an optical sensor is sensing a peak intensity value.

67. The method of claim 40, wherein the measurement includes measurements indicative of an angle of the probe with respect to the surface.

68. The method of claim 40, wherein optical characteristics data are electronically transmitted to a remote location, wherein a second dental object is produced at the remote location based on the transmitted optical characteristics data.

69. The method of claim 68, wherein the electronic transmission comprises a modem transmission.

70. The method of claim 68, wherein the electronic transmission comprises a facsimile transmission.

71. The method of claim 40, wherein the probe has a removable cover element.

72. The method of claim 71, wherein the removable cover element comprises a shield.

73. The method of claim 71, wherein the removable cover element is positioned on the probe prior to positioning of the probe in proximity to the dental object.

74. The method of claim 73, wherein the removable cover element is sterilized prior to being positioned on the probe.

75. The method of claim 40, wherein the probe has a removable tip.

76. The method of claim 75, wherein the removable tip is positioned on the probe prior to positioning of the probe in proximity to the dental object.

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

78. The method of claim 40, wherein optical characteristics data are stored in a database, wherein the database includes date and time information associated with the optical characteristics data.

79. The method of claim 40, wherein the probe is positioned in proximity to the dental object by relative movement of the probe with respect to the dental object.

80. The method of claim 40, wherein a source emits light on a first area of the dental object, wherein a receiver receives light reflected from a second area of the dental object, wherein the step of measuring the optical characteristics of the dental object includes at least one measurement taken when the first area does not intersect with the second area, wherein the measurement generates data indicative of translucence characteristics of the dental object.

81. The method of claim 40, wherein the step of measuring the optical characteristics of the dental object includes one measurement taken when the probe is in contact or near contact with the dental object, wherein the measurement generates data indicative of translucence characteristics of the dental object.

107. The method of claim 80, wherein the plurality of first and second measurements include measurements taken at first and second distances from the dental object.

82. A method, comprising the steps of:

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

taking of a plurality of first and second measurements with the optical sensors as the probe is positioned towards the surface of the dental object, wherein the first and second measurements measure light that is incident on the surface of the dental object and received from the dental object, wherein optical characteristics of the dental object are determined based on the first and second measurements.

83. The method of claim 82, wherein the optical characteristics comprise color characteristics.

84. The method of claim 82, wherein the optical characteristics comprise translucence characteristics.

85. The method of claim 82, wherein the optical characteristics comprise fluorescence characteristics.

86. The method of claim 82, wherein the optical characteristics comprise surface texture characteristics.

87. The method of claim 82, further comprising the step of displaying a representation of the optical characteristics on a display device.

88. The method of claim 82, further comprising the step of generating audio information, wherein the audio information is indicative of the status of the optical characteristics determination.

89. The method of claim 82, wherein a material mixing unit receives data indicative of the optical characteristics, wherein the material mixing unit prepares constituent materials for a second dental object based on the data indicative of the optical characteristics, wherein the constituent materials of the second dental object are selected based on the data indicative of the optical characteristics.

90. The method of claim 83, wherein the step of determining optical characteristics comprises the steps of generating first data indicative of color characteristics and generating second data indicative of translucence characteristics, wherein the first data are adjusted based on the second data.

91. The method of claim 82, wherein optical characteristics data are generated a plurality of times for a plurality of dental objects to generate a plurality of database records.

92. The method of claim 91, wherein the database records are associated with particular patients.

93. The method of claim 91, wherein the database records store pictures of the dental objects.

94. The method of claim 93, wherein the pictures are generated with a camera.

95. The method of claim 94, wherein the probe and the camera are integrated into a single unit.

96. The method of claim 94, wherein the probe and the camera share a common light source.

97. The method of claim 82, wherein optical characteristics data are generated a plurality of times for the dental object, wherein a database stores a historical record of the optical characteristics of the dental object.

98. The method of claim 82, wherein a second dental object is produced based on optical characteristics data.

99. The method of claim 98, wherein the second dental object comprises a denture.

100. The method of claim 98, wherein the second dental object comprises a dental prosthesis.

101. The method of claim 98, wherein the second dental object comprises a filling.

102. The method of claim 98, wherein the second dental object comprises a tooth-colored filling.

103. The method of claim 98, wherein the second dental object comprises a composite filling.

104. The method of claim 98, wherein the second dental object is produced based on a porcelain recipe determined mi accordance with the optical characteristics data.

105. The method of claim 104, wherein the optical characteristics data include fluorescence data, wherein a fluorescing-type material is added to the recipe based on the fluorescence data.

106. The method of claim 104, wherein a texturing material is added to the recipe.

108. The method of claim 82, wherein the plurality of first and second measurements include a measurement taken at or about a time when an optical sensor is sensing a peak intensity value.

109. The method of claim 82, wherein the plurality of first and second measurements include measurements indicative of an angle of the probe with respect to the surface.

110. The method of claim 82, wherein optical characteristics data are electronically transmitted to a remote location, wherein a second dental object is produced at the remote location based on the transmitted optical characteristics data.

111. The method of claim 110, wherein the electronic transmission comprises a modem transmission.

112. The method of claim 110, wherein the electronic transmission comprises a facsimile transmission.

113. The method of claim 82, wherein the probe has a removable cover element.

114. The method of claim 113, wherein the removable cover element comprises a shield.

115. The method of claim 113, wherein the removable cover element is positioned on the probe prior to positioning of the probe in proximity to the dental object.

116. The method of claim 115, wherein the removable cover element is sterilized prior to being positioned on the probe.

117. The method of claim 82, wherein the probe has a removable tip.

118. The method of claim 117, wherein the removable tip is positioned on the probe prior to positioning of the probe in proximity to the dental object.

119. The method of claim 118, wherein the removable tip is sterilized prior to being positioned on the probe.

120. The method of claim 82, wherein optical characteristics data are stored in a database, wherein the database includes date and time information associated with the optical characteristics data.

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

122. The method of claim 82, wherein a source emits light on a first area of the dental object, wherein a receiver receives light reflected from a second area of the dental object, wherein the step of taking a plurality of first and second measurements includes at least one measurement taken when the first area does not intersect with the second area, wherein the measurement generates data indicative of translucence characteristics of the object.

123. The method of claim 82, wherein the step of taking a plurality of first and second measurements includes one measurement taken when the probe is in contact or near contact with the dental object, wherein the measurement generates data indicative of translucence characteristics of the dental object.