Tooth shade analyzer system and methods

• US 5,961,324 A
• Filed: 05/20/1998
• Issued: 10/05/1999
• Est. Priority Date: 06/26/1995
• Status: Expired due to Term

• Current Assignee: Maryann Lehmann
• Original Assignee: Shade Analyzing Technologies
• Inventors: Lehmann, Maryann
• Primary Examiner(s): Mancene, Gene
• Assistant Examiner(s): PHILOGENE, PEDRO
• Application Number:
  US09/082,030
• Time in Patent Office: 503 Days
• Field of Search: 433/26, 433/29, 433/203.1, 433/215, 364/413.28, 356/402, 356/405, 356/406, 356/408
• US Class Current: 433/26
• CPC Class Codes: A61C 19/10 Supports for artificial teeth for transport or for comparison of the colour
• 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 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/508 measuring the colour of teeth
• CPC Class Codes: G01J 3/513 having fixed filter-detector pairs
• CPC Class Codes: G01J 3/52 using colour charts
• 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

Abstract

An intraoral camera connects to a shade analyzer subsystem, e.g., a digital video processor, and a color display monitor. The camera captures a digital color image of the patient'"'"'s tooth and the subsystem compares that image to a stored plurality of tooth shades. Each tooth shade is represented in a block of data, including color image data, a tooth shade digital word, and a manufacturer type. The patient'"'"'s tooth image includes an RGB chromaticity representation that is scanned and compared with the several tooth shades stored in memory, and a match is determined and communicated to a user of the system. The methodology includes the specification of fractional tooth shades, if needed, corresponding to a plurality of porcelain films for manufacturing a reconstructed tooth.

Claims

1. A system for determining the tooth shade of a patient'"'"'s tooth, comprising:

an intraoral camera for capturing the image of the patient'"'"'s tooth, the image including color information representative of a color of the tooth, and

a shade analyzer sub-system connected for electrical communication with the intraoral camera, the shade analyzer having

(i) color processing means for determining the color of the patient'"'"'s tooth from the color information of the image,

(ii) storage means for storing shade information representative of a plurality of tooth shades, each of the tooth shades corresponding to a different tooth color,

(iii) color correlation means for comparing the color of the patient'"'"'s tooth to the plurality of tooth shades and for identifying a tooth shade with a color corresponding to the color of the patient'"'"'s tooth, and

(iv) means for communicating the identified tooth shade to a user of the system.

2. A system according to claim 1, further comprising monitor means connected for display of the color image to a user of the system, the shade analyzer sub-system further comprising means for communicating a tooth color representative of the identified tooth shade to the monitor means, thereby providing a user of the system with a visual comparison of the patient'"'"'s tooth color with the color of the identified tooth shade.

3. A system according to claim 1, wherein the color processing means comprises means for determining RGB chromaticities of the color image, and wherein each of the plurality of tooth shades has a corresponding RGB representation of the tooth color, and wherein the color correlation means comprises means for quantitatively comparing the RGB chromaticities with the RGB representation of each of the tooth shades, the color correlation means comparing and identifying a tooth shade based upon an comparison of the chromaticities and the RGB representations.

4. A system according to claim 1, further comprising means for (i) associating one or more of the plurality of tooth shades with at least one standardized shade corresponding to a particular manufacturer'"'"'s porcelain product, and for (ii) communicating the standardized shade to a user of the system.

5. A system according to claim 1, wherein the color correlation means further comprises means for identifying a combination of tooth shades having a combined color corresponding to the color of the patient'"'"'s tooth.

6. A system according to claim 5, further comprising means (i) for associating each of the tooth shades in the combination with at least one standardized shade corresponding to an particular manufacturer'"'"'s porcelain product, (ii) for specifying fractions of each of the standardized shades needed to form the combined color, and (iii) for communicating information identifying the fractions of each of the tooth shades in the combination to a user of the system.

7. A tooth shade analyzer system for determining the tooth shade of a patient'"'"'s tooth, comprising:

means for communicating with an intraoral camera, the camera of the type which captures the image of the patient'"'"'s tooth, the image including color information representative of a color of the tooth,

color processing means for determining the color of the patient'"'"'s tooth from the color information of the image,

storage means for storing shade information representative of a plurality of tooth shades, each of the tooth shades corresponding to a different tooth color,

color correlation means for comparing the color of the patient'"'"'s tooth to the plurality of tooth shades and for identifying one or more tooth shades with a combined color corresponding to the color of the patient'"'"'s tooth, and

means for communicating the one or more identified tooth shades to a user of the system, the shade analyzer system thereby matching the patient'"'"'s tooth with one or more corresponding tooth shades and assisting in reconstructing the patient'"'"'s tooth.

8. A method for determining the tooth shade of a patient'"'"'s tooth, comprising the steps of:

capturing the image of the patient'"'"'s tooth with an intraoral camera, the image including color information representative of a color of the tooth,

determining the color of the patient'"'"'s tooth from the color information of the image,

comparing the color of the patient'"'"'s tooth to a plurality of tooth shades, the tooth shades being stored in an electronic medium,

identifying one or more tooth shades with a combined color corresponding to the color of the patient'"'"'s tooth, and

communicating the one or more identified tooth shades to a user of the system.