Miniaturized system and method for measuring optical characteristics

• US 7,978,317 B2
• Filed: 12/23/2008
• Issued: 07/12/2011
• Est. Priority Date: 02/21/2002
• Status: Active Grant

• Current Assignee: Vita Zahnfabrik H. Rauter GMBH & Co.. KG (Rauter Beteiligungsgesellschaft mbH)
• Original Assignee: Vita Zahnfabrik H. Rauter GMBH & Co.. KG (Rauter Beteiligungsgesellschaft mbH)
• Inventors: Loudermilk, Alan R., Jung, Russell W., Sloan, Walter W., Jung, Wayne D.
• Primary Examiner(s): Lauchman; L. G
• Application Number:
  US12/343,366
• Publication Number:
  US 20090147243A1
• Time in Patent Office: 931 Days
• Field of Search: 356/73, 356/326, 356402-407, 356/328, 356/417, 356/419
• US Class Current: 356/73
• 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: G01J 1/0271 Housings; Attachments or accessories for photometers
• CPC Class Codes: G01J 2003/466 Coded colour; Recognition of predetermined colour; Determining proximity to predetermined colour
• CPC Class Codes: G01J 3/02 Details
• CPC Class Codes: G01J 3/0218 using optical fibers
• CPC Class Codes: G01J 3/0256 Compact construction
• CPC Class Codes: G01J 3/0264 Electrical interface; User interface
• CPC Class Codes: G01J 3/0272 Handheld
• 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 3/0294 Multi-channel spectroscopy
• CPC Class Codes: G01J 3/36 Investigating two or more bands of a spectrum by separate detectors
• CPC Class Codes: G01J 3/46 Measurement of colour; Colour measuring devices, e.g. colorimeters measuring colour temperature G01J5/60
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/463 Colour matching
• 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 3/524 Calibration of colorimeters
• CPC Class Codes: G01N 21/25 Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
• CPC Class Codes: G01N 21/57 : Measuring gloss

Abstract

A miniaturized spectrometer/spectrophotometer system and methods are disclosed. A probe tip including one or more light sources and a plurality of light receivers is provided. A first spectrometer system receives light from a first set of the plurality of light receivers. A second spectrometer system receives light from a second set of the plurality of light receivers. A processor, wherein the processor receives data generated by the first spectrometer system and the second spectrometer system, wherein an optical measurement of a sample under test is produced based on the data generated by the first and second spectrometer systems.

Claims

1. A method of determining optical characteristics of a dental object, the method comprising:

applying a barrier to a tip of a probe;

providing a reference object with known optical properties;

measuring the optical properties of the reference object with the probe;

storing the measured optical properties of the reference object;

measuring first optical properties of a calibration block with the probe;

generating a first set of calibration data corresponding to the known and measured optical properties of the reference object, and the measured first optical properties of the calibration block;

measuring second optical properties of the calibration block with the probe;

comparing the measured second optical properties of the calibration block with the first set of calibration data to generate a second set of calibration data;

measuring the optical properties of the dental object with the calibrated probe; and

calibrating the measured optical properties of the dental object according to the second set of calibration data.

2. The method of claim 1, wherein the optical characteristics include color information comprising value, chroma and hue information.

3. The method of claim 1, further comprising storing data corresponding to a shade guide system having a plurality of shade guide values, wherein the calibrated optical characteristics data are generated in the form of a closest match or matches to one or more of the stored shade guide values.

4. The method of claim 1, further comprising storing the calibrated optical characteristics data in a record of a database associated with a particular patient.

5. The method of claim 1, wherein the calibration block is made of is a translucent or semi-transparent material.

6. The method of claim 5, wherein optical properties of the calibration block are substantially in the middle of optical properties of normal human teeth.

7. The method of claim 1, further comprising providing by a user type of material for the reference object, the calibration block, or the dental object.

8. The method of claim 1, further comprising displaying the second set of calibration data.

9. The method of claim 8, wherein the display further includes one or multiple known shade guide values.

10. The method of claim 8, wherein the display further includes one or more of the group consisting of Pantone colors, shades, paint formulations, closest match, and pass/fail results.

11. The method of claim 10, further comprising activating the display to further display deviation from a true color of the displayed closest match.

12. The method of claim 9, further comprising activating the display to further display additional information regarding the measured optical properties relative to value, chroma and hue in the known shade guide values.

13. A method of determining optical characteristics of a dental object, the method comprising:

applying a barrier to a tip of a probe;

providing known calibration data;

capturing the known calibration data by the probe with the barrier;

generating normalization data corresponding to the captured known calibration data and provided known calibration data;

positioning the probe with the barrier in proximity to the dental object to capture the optical characteristics of the dental object; and

calibrating the captured optical characteristics of the dental object, corresponding to the normalization data.

14. The method of claim 13, wherein the optical characteristics include color information comprising value, chroma and hue information.

15. The method of claim 13, further comprising storing data corresponding to a shade guide system having a plurality of shade guide values, wherein the calibrated optical characteristics data are generated in the form of a closest match or matches to one or more of the stored shade guide values.

16. The method of claim 13, further comprising storing the calibrated optical characteristics data in a record of a database associated with a particular patient.

17. The method of claim 13, wherein the known calibration data is for a calibration block made of is a translucent or semi-transparent material having optical properties substantially in the middle of optical properties of normal human teeth.

18. The method of claim 13, further comprising displaying the normalization data;

and activating the display to further display additional information related to the normalization data and the dental object.

19. A system for determining optical characteristics of a dental object comprising:

a calibration block of known optical characteristics;

a probe having a tip to capture the optical characteristics of the dental object and the calibration block;

a barrier applied to the tip of the probe; and

a first computer to generate normalization data corresponding to known calibration data captured by the probe with the barrier and the known calibration data, and to calibrate the captured optical characteristics of the dental object corresponding to the normalization data.

20. The system of claim 19, further comprising:

a transmission medium for transmitting the calibrated optical characteristics data to a remote location; and

a second computer at the remote location for receiving the calibrated optical characteristics data to be used for producing a second dental object based on the calibrated optical characteristics data.

21. The system of claim 19, further comprising a database for storing data corresponding to a shade guide system having a plurality of shade guide values, wherein the calibrated optical characteristics data are generated in the form of a closest match or matches to one or more of the stored shade guide values, and for storing the calibrated optical characteristics data in a record of a database associated with a particular patient.

22. The system of claim 19, further comprising a cradle for accepting the probe, wherein the first computer is configured to start calibrating the captured optical characteristics of the dental object when the probe is positioned inside the cradle.

23. The system of claim 19, further comprising a guide portion to guide the tip of the probe to land in a center portion of the calibration block to start calibrating.