Methods for determining optical characteristics of dental objects using an imaging element and a spectrometer apparatus

• US 7,018,204 B2
• Filed: 06/01/2001
• Issued: 03/28/2006
• 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): Lewis, Ralph A.
• Application Number:
  US09/872,071
• Publication Number:
  US 20010029009A1
• Time in Patent Office: 1,761 Days
• Field of Search: 433/26, 433/29, 433/203.1, 433/116, 600/125, 600/124, 600/182, 600/477, 600/478, 356/73, 356/371, 356/402, 356/405, 356/406, 356/407
• 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 5/4547 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 of determining the optical characteristics of a dental object with an integrated system including a camera and a spectrophotometer, comprising the steps of:

generating an image of the dental object with the camera of the integrated system;

software processing the image of the dental object to determine a plurality of regions of the dental object that have different optical characteristics; and

generating optical characteristics data indicative of the optical characteristics of the dental object in one or more of the plurality of regions with the spectrophotometer of the integrated system.

2. The method of claim 1, wherein the method further comprises the step of calibrating the spectrophotometer by taking a measurement of a calibration standard.

3. The method of claim 1, wherein the spectrophotometer measures light returned from the dental object in a plurality of spectral bands.

4. The method of claim 1, wherein the integrated system operates with audio feedback, wherein the audio feedback guides a user'"'"'s operation of the integrated system.

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

6. The method of claim 5, where in the database records are associated with particular patients.

7. The method of claim 5, wherein the database records store pictures of the dental objects.

8. The method of claim 7, wherein the pictures of the dental objects comprise images of the dental objects captured with the camera.

9. The method of claim 5, wherein the 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.

10. The method of claim 1, wherein a second dental object is produced based on the optical characteristics data.

11. The method of claim 10, wherein optical characteristics of the second dental object are determined prior to installation of the second dental object in a patient'"'"'s mouth.

12. The method of claim 11, wherein the optical characteristics of the second dental object are determined with the integrated system or a second integrated system.

13. The method of claim 11, wherein the optical characteristics of the second dental object are determined at a location where the second dental object is produced.

14. The method of claim 13, wherein the optical characteristics of the second dental object are determined with a second integrated system.

15. The method of claim 11, wherein the optical characteristics of the second dental object are determined at a location wherein the second dental object is to be installed in the patient'"'"'s mouth.

16. The method of claim 15, wherein the optical characteristics of the second dental object are determined with the integrated system.

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

18. The method of claim 10, wherein the second dental object comprises a dental prosthesis.

19. The method of claim 10, wherein the second dental object comprises a filling.

20. The method of claim 10, wherein the second dental object comprises a tooth-colored filling.

21. The method of claim 10, wherein the second dental object comprises a composite filling.

22. The method of claim 10, wherein the second dental object is produced based on a porcelain recipe determined in accordance with the optical characteristics data.

23. 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.

24. The method of claim 23, wherein the electronic transmission comprises a modem transmission.

25. The method of claim 23, wherein the electronic transmission includes a transmission of a picture of the dental object.

26. The method of claim 25, wherein the picture of the dental object comprises an image of the dental object captured with the camera.

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

28. The method of claim 1, wherein the optical characteristics data are stored in a database, wherein optical characteristics data indicative of the optical characteristics are generated a plurality of times, including at least once for a plurality of the regions.

29. The method of claim 28, wherein the database stores sectoring information with the optical characteristics data.

30. The method of claim 29, wherein the database stores information corresponding to a pictorial representation of the dental object that includes sector grid lines.

31. The method of claim 1, wherein a material mixing unit receives the optical characteristics data, wherein the material mixing unit prepares constituent materials for a second dental object based on the optical characteristics data.

32. The method of claim 1, wherein the camera comprises an intraoral camera.

33. The method of claim 1, wherein the camera comprises a video camera.

34. The method of claim 1, wherein the optical characteristics data is output in the form of a closest match or matches to one or a plurality of sets of stored shade guide values.

35. The method of claim 1, wherein a computing system stores data corresponding to a plurality of shade guide systems, each of the plurality of shade guide systems having a plurality of shade guide values, wherein the optical characteristics data 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.

36. The method of claim 35, wherein the optical characteristics data is output in the form of the closest match to one of the shade guide values in the plurality of shade guide systems.

37. The method of claim 1, wherein the optical characteristics data is used to electronically output a proposed recipe of materials for preparing a second dental object.

38. The method of claim 37, wherein the optical characteristics data is used to electronically output a proposed recipe of materials and instruction information for preparing a second dental object.

39. The method of claim 1, wherein the optical characteristics data is output in the form of one or more sets of color tri-stimulus values.

40. The method of claim 1, wherein an image of the dental object is displayed, wherein data indicative of the color of the dental object in one or more particular regions of the plurality of regions are displayed in an overlaid manner over the one or more particular regions.

41. A method of determining the optical characteristics of a dental object with an integrated system including a camera and a spectrophotometer, comprising the steps of:

generating an image of the dental object with the camera of the integrated system;

software processing the image of the dental object; and

generating optical characteristics data indicative of the optical characteristics of the dental object in one or more of regions of the dental object with the spectrophotometer of the integrated system.

42. The method of claim 41, wherein the method further comprises the step of calibrating the spectrophotometer by taking a measurement of a calibration standard.

43. The method of claim 41, wherein the spectrophotometer measures light returned from the dental object in a plurality of spectral bands.

44. The method of claim 41, wherein the integrated system operates with audio feedback, wherein the audio feedback guides a user'"'"'s operation of the integrated system.

45. The method of claim 41, wherein the optical characteristics data are stored in a database, wherein the optical characteristics data are generated a plurality of times for a plurality of dental objects to generate a plurality of optical characteristics database records.

46. The method of claim 45, wherein the database records are associated with particular patients.

47. The method of claim 45, wherein the database records store pictures of the dental objects.

48. The method of claim 47, wherein the pictures of the dental objects comprise images of the dental objects captured the camera.

49. The method of claim 45, wherein the 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.

50. The method of claim 41, wherein a second dental object is produced based on the optical characteristics data.

51. The method of claim 50, wherein optical characteristics of the second dental object are determined prior to installation of the second dental object in a patient'"'"'s mouth.

52. The method of claim 51, wherein the optical characteristics of the second dental object are determined with the integrated system or a second integrated system.

53. The method of claim 51, wherein the optical characteristics of the second dental object are determined at a location where the second dental object is produced.

54. The method of claim 53, wherein the optical characteristics of the second dental object are determined with a second integrated system.

55. The method of claim 51, wherein the optical characteristics of the second dental object are determined at a location wherein the second dental object is to be installed in the patient'"'"'s mouth.

56. The method of claim 55, wherein the optical characteristics of the second dental object are determined with the integrated system.

57. The method of claim 50, wherein the second dental object comprises a denture.

58. The method of claim 50, wherein the second dental object comprises a dental prosthesis.

59. The method of claim 50, wherein the second dental object comprises a filling.

60. The method of claim 50, wherein the second dental object comprises a tooth-colored filling.

61. The method of claim 50, wherein the second dental object comprises a composite filling.

62. The method of claim 50, wherein the second dental object is produced based on a porcelain recipe determined in accordance with the optical characteristics data.

63. The method of claim 41, 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.

64. The method of claim 63, wherein the electronic transmission comprises a modem transmission.

65. The method of claim 63, wherein the electronic transmission includes a transmission of a picture of the dental object.

66. The method of claim 65, wherein the picture of the dental object comprises an image of the dental object captured with the camera.

67. The method of claim 41, wherein the optical characteristics data are stored in a database, wherein the database includes date and time information associated with the optical characteristics data.

68. The method of claim 41, wherein the optical characteristics data are stored in a database, wherein optical characteristics data indicative of the optical characteristics are generated a plurality of times, including at least once for a plurality of regions of the dental object.

69. The method of claim 68, wherein the database stores sectoring information with the optical characteristics data.

70. The method of claim 69, wherein the database stores information corresponding to a pictorial representation of the dental object that includes sector grid lines.

71. The method of claim 41, wherein a material mixing unit receives the optical characteristics data, wherein the material mixing unit prepares constituent materials for a second dental object based on the optical characteristics data.

72. The method of claim 41, wherein the camera comprises an intraoral camera.

73. The method of claim 41, wherein the camera comprises a video camera.

74. The method of claim 41, wherein the optical characteristics data is output in the form of a closest match or matches to one or a plurality of sets of stored shade guide values.

75. The method of claim 41, wherein a computing system stores data corresponding to a plurality of shade guide systems, each of the plurality of shade guide systems having a plurality of shade guide values, wherein the optical characteristics data 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.

76. The method of claim 75, wherein the optical characteristics data is output in the form of the closest match to one of the shade guide values in the plurality of shade guide systems.

77. The method of claim 41, wherein the optical characteristics data is used to electronically output a proposed recipe of materials for preparing a second dental object.

78. The method of claim 77, wherein the optical characteristics data is used to electronically output a proposed recipe of materials and instruction information for preparing a second dental object.

79. The method of claim 41, wherein the optical characteristics data is output in the form of one or more sets of color tri-stimulus values.

80. The method of claim 41, wherein an image of the dental object is displayed, wherein data indicative of the color of the dental object in one or more particular regions of the dental object are displayed in an overlaid manner over the one or more particular regions.

81. A method of determining the optical characteristics of a dental object with an apparatus that includes an imaging element and a spectrometer apparatus, the method comprising the steps of:

generating an image of the dental object with the imaging element; and

generating optical characteristics data indicative of optical characteristics of the dental object including at least color characteristics with the spectrometer apparatus;

wherein, under software control a determination is made of a plurality of regions of the dental object having different color characteristics;

wherein optical characteristics of the dental object including at least color characteristics are determined in the plurality of regions based on the optical characteristics data generated with the spectrometer apparatus.

82. The method of claim 81, wherein the method further comprises the step of generating optical characteristics data of a color reference standard, wherein the optical characteristics data indicative of optical characteristics of the dental object are generated based on the optical characteristics data of the color reference standard.

83. The method of claim 81, wherein the spectrometer apparatus measures light returned from the dental object in a plurality of spectral bands.

84. The method of claim 81, wherein audio feedback is generated, wherein the audio feedback guides a user'"'"'s operation of the apparatus.

85. The method of claim 81, wherein the optical characteristics data are stored in a database, wherein the optical characteristics data are generated a plurality of times for a plurality of dental objects to generate a plurality of optical characteristics database records.

86. The method of claim 85, wherein the database records are associated with particular patients.

87. The method of claim 85, wherein the database records store images representative of the dental objects.

88. The method of claim 87, wherein the images representative of the dental objects comprise images of the dental objects captured with the imaging element.

89. The method of claim 85, wherein the 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.

90. The method of claim 81, wherein a second dental object is produced based on the optical characteristics data.

91. The method of claim 90, wherein optical characteristics of the second dental object are determined prior to installation of the second dental object in a patient'"'"'s mouth.

92. The method of claim 91, wherein the optical characteristics of the second dental object are determined with the apparat or a second apparatus.

93. The method of claim 91, wherein the optical characteristics of the second dental object are determined at a location where the second dental object is produced.

94. The method of claim 93, wherein the optical characteristics of the second dental object are determined with a second apparatus.

95. The method of claim 91, wherein the optical characteristics of the second dental object are determined at a location wherein the second dental object is to be installed in the patient'"'"'s mouth.

96. The method of claim 95, wherein the optical characteristics of the second dental object are determined with the apparatus.

97. The method of claim 90, wherein the second dental object comprises a denture.

98. The method of claim 90, wherein the second dental object comprises a dental prosthesis.

99. The method of claim 90, wherein the second dental object comprises a filling.

100. The method of claim 90, wherein the second dental object comprises a tooth-colored filling.

101. The method of claim 90, wherein the second dental object comprises a composite filling.

102. The method of claim 90, wherein the second dental object is produced based on a porcelain recipe determined in accordance with the optical characteristics data.

103. The method of claim 81, 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.

104. The method of claim 103, wherein the electronic transmission comprises a modem transmission.

105. The method of claim 103, wherein the electronic transmission includes a transmission of an image representative of the dental object.

106. The method of claim 105, wherein the image representative of the dental object comprises an image of the dental object captured with the imaging element.

107. The method of claim 81, wherein the optical characteristics data are stored in a database, wherein the database includes date and time information associated with the optical characteristics data.

108. The method of claim 81, wherein the optical characteristics data are stored in a database, wherein optical characteristics data indicative of the optical characteristics are generated a plurality of times, including at least once for a plurality of the regions.

109. The method of claim 108, wherein the database stores sectoring information with the optical characteristics data.

110. The method of claim 109, wherein the database stores information corresponding to a pictorial representation of the dental object that includes sector grid lines.

111. The method of claim 81, wherein a material mixing unit receives the optical characteristics data, wherein the material mixing unit prepares constituent materials for a second dental object based on the optical characteristics data.

112. The method of claim 81, wherein the imaging element comprises an intraoral camera.

113. The method of claim 81, wherein the imaging element comprises a video camera.

114. The method of claim 81, wherein the optical characteristics data is output in the form of a closest match or matches to one or a plurality of sets of stored shade guide values.

115. The method of claim 81, wherein a computing system stores data corresponding to a plurality of shade guide systems, each of the plurality of shade guide systems having a plurality of shade guide values, wherein the optical characteristics data 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.

116. The method of claim 115, wherein the optical characteristics data is output in the form of the closest match to one of the shade guide values in the plurality of shade guide systems.

117. The method of claim 81, wherein the optical characteristics data is used to electronically output a proposed recipe of materials for preparing a second dental object.

118. The method of claim 117, wherein the optical characteristics data is used to electronically output a proposed recipe of materials and instruction information for preparing a second dental object.

119. The method of claim 81, wherein the optical characteristics data is output in the form of one or more sets of color tri-stimulus values.

120. The method of claim 81, wherein an image of the dental object is displayed, wherein data indicative of the color of the dental object in one or more particular regions of the plurality of regions are displayed in an overlaid manner over the one or more particular regions.