Device for detecting dental caries

• US 5,306,144 A
• Filed: 01/12/1993
• Issued: 04/26/1994
• Est. Priority Date: 01/14/1992
• Status: Expired due to Term

• Current Assignee: Kaltenbach & Voigt Gmbh & Co. (Danaher Corporation)
• Original Assignee: Kaltenbach & Voigt Gmbh & Co. (Danaher Corporation)
• Inventors: Konig, Karsten, Hibst, Raimund
• Primary Examiner(s): Mancene, Gene
• Assistant Examiner(s): CHERICHETTI, CINDY
• Application Number:
  US08/003,267
• Time in Patent Office: 469 Days
• Field of Search: 433/29, 433/215, 433/229, 128/777, 128/665, 128/634, 356/317, 356/318, 356/341
• US Class Current: 433/29
• CPC Class Codes: A61B 5/0088 for oral or dental tissue
• 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: F21V 21/30 Pivoted housings or frames
• CPC Class Codes: F21W 2131/202 for dentistry
• CPC Class Codes: G02B 6/0096 the lights guides being of the hollow type
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures
• CPC Class Codes: G02B 6/4298 coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers

Abstract

A device for detecting dental caries has an illumination device which emits radiation of a pre-determined wavelength towards a tooth. A filter accepts radiation returned by the tooth in a pre-determined spectral range. The accepted radiation is evaluated for caries detection. The illumination device has at least one light guide, by means of which the radiation can be supplied to the tooth. The illumination device emits radiation in the spectral range from 360 to 580 nm. The filter accepts the returned radiation in the spectral range above 620 nm. The device can be used in a flexible manner and enables a low level of caries to be identified.

Claims

1. Device for detecting dental caries, having an illumination device which emits radiation at a predetermined wavelength in the spectral range from 360 to 580 nm towards at least one tooth, and having at least one filter which accepts radiation returned by the tooth in a predetermined spectral range above 620 nm, the accepted radiation being evaluated for caries detection, wherein the illumination device has at least one light guide, by means of which the radiation is supplied to the tooth, and wherein a detector is connected after the filter, seen in the direction of the returned radiation, which detector converts the radiation supplied to it into a first electrical signal, and a further filter is provided which accepts radiation returned by the tooth in a further spectral range different from the spectral range of the filter, and the detector converts the filtered radiation into a second electrical signal which is supplied to a quotient-forming element, which forms a quotient from the first signal and the second signal, which quotient serves as a measure of the presence of caries.

2. Device according to claim 1, wherein the filter and the further filter are arranged on a chopper disc and can be placed in turn in the beam path of the returned radiation, in that the detector detects the filtered radiation, and in that the first signal and second signal are generated by means of scanning synchronous with the rotation of the chopper disc, from the signal delivered by the detector.

3. Device according to claim 1, wherein the returned radiation is detected by at least two light guide fibers which are respectively provided, at the end facing away from the tooth, with the filter and the further filter, respectively, and there being arranged after each filter a detector which detects the filtered radiation.

4. Device according to claim 1, wherein the filter accepts radiation of a wavelength in the region around 636 or 673 nm and the further filter accepts radiation of a wavelength in the region around 550 nm.

5. Device according to claim 1, wherein the filter accepts returned radiation in the spectral range from 620 to 720 nm.

6. Device according to claim 1, wherein the illumination device emits radiation in the spectral range from 360 to 420 nm.

7. Device according to claim 1, wherein the illumination device emits radiation in the spectral range from 470 to 580 nm.

8. Device according to claim 1, wherein the filter is arranged on a spectacle frame.

9. Device according to claim 1, wherein an image guide is provided as the light guide.

10. Device according to claim 1, wherein the light guide or light guides are accommodated by an endoscope, to which a camera can be attached.

11. Device according to claim 1, wherein the illumination device comprises a further light source which generates white light which can be added to the emitted radiation.

12. Device for detecting dental caries, having an illumination device which emits radiation at a predetermined wavelength in the spectral range from 360 to 580 nm towards at least one tooth, and having at least one filter which accepts radiation returned by the tooth in a predetermined spectral range above 620 nm, the accepted radiation being evaluated for caries detection, wherein the illumination device has at least one light guide, by means of which the radiation is supplied to the tooth, and wherein a detector is connected after the filter, seen in the direction of the returned radiation, which detector converts the radiation supplied to it into a first electrical signal, and a further filter is provided which accepts radiation returned by the tooth in a further spectral range different from the spectral range of the filter, and a further detector converts the filtered radiation into a second electrical signal which is supplied to a quotient-forming element, which forms a quotient from the first signal and the second signal, which quotient serves as a measure of the presence of caries.

13. Device according to claim 12, wherein the filter and the further filter are arranged on a chopper disc and can be placed in turn in the beam path of the returned radiation, in that the detector detects the filtered radiation, and in that the first signal and second signal are generated by means of scanning synchronous with the rotation of the chopper disc, from the signal delivered by the detector.

14. Device according to claim 12, wherein the returned radiation is detected by at least two light guide fibers which are respectively provided, at the end facing away from the tooth, with the filter and the further filter, respectively, and there being arranged after each filter a detector which detects the filtered radiation.

15. Device according to claim 12, wherein the filter accepts radiation of a wavelength in the region around 636 or 673 nm and the further filter accepts radiation of a wavelength in the region around 550 nm.

16. Device according to claim 12, wherein the filter accepts returned radiation in the spectral range from 620 to 720 nm.

17. Device according to claim 12, wherein the illumination device emits radiation in the spectral range from 360 to 420 nm.

18. Device according to claim 12, wherein the illumination device emits radiation in the spectral range from 470 to 580 nm.

19. Device according to claim 12, wherein the filter is arranged on a spectacle frame.

20. Device according to claim 12, wherein an image guide is provided as the light guide.

21. Device according to claim 12, wherein the light guide or light guides are accommodated by an endoscope, to which a camera can be attached.

22. Device according to claim 12, wherein the illumination device comprises a further light source which generates white light which can be added to the emitted radiation.

23. Device for detecting dental caries, having an illumination device which emits radiation at a predetermined wavelength in the spectral range from 360 to 580 nm towards at least one tooth, and having at least one filter which accepts radiation returned by the tooth in a predetermined spectral range above 620 nm, the accepted radiation being evaluated for caries detection, wherein the illumination device has at least one light guide, by means of which the radiation is supplied to the tooth, and wherein the at least one light guide is provided on the side of the illumination device with a separating mirror, the separating surface of which is inclined at an angle of substantially 45°

from the optical axis of the light guide.

24. Device according to claim 23, wherein the filter accepts returned radiation in the spectral range from 620 to 720 nm.

25. Device according to claim 23, wherein the illumination device emits radiation in the spectral range from 360 to 420 nm.

26. Device according to claim 23, wherein the illumination device emits radiation in the spectral range from 470 to 580 nm.

27. Device according to claim 23, wherein the filter is arranged on a spectacle frame.

28. Device according to claim 23, wherein an image guide is provided as the light guide.

29. Device according to claim 23, wherein the light guide or light guides are accommodated by an endoscope, to which a camera can be attached.

30. Device according to claim 23, wherein the illumination device comprises a further light source which generates while light which can be added to the emitted radiation.

31. Device for detecting dental caries, having an illumination device which emits radiation at a predetermined wavelength in the spectral range from 360 to 580 nm towards at least one tooth, and having at least one filter which accepts radiation returned by the tooth in a predetermined spectral range above 620 nm, the accepted radiation being evaluated for caries detection, wherein the illumination device has at least one light guide, by means of which the radiation is supplied to the tooth, and wherein the light guide is surrounded by an outer light guide which guides the returned radiation.

32. Device according to claim 31, wherein the light guide is arranged displaceably within the outer light guide surrounding it.

33. Device according to claim 31, wherein the filter accepts returned radiation in the spectral range from 620 to 720 nm.

34. Device according to claim 31, wherein the illumination device emits radiation in the spectral range from 360 to 420 nm.

35. Device according to claim 31, wherein the illumination device emits radiation in the spectral range from 470 to 580 nm.

36. Device according to claim 31, wherein the filter is arranged on a spectacle frame.

37. Device according to claim 31, wherein an image guide is provided as the light guide.

38. Device according to claim 31, wherein the light guide or light guides are accommodated by an endoscope, to which a camera can be attached.

39. Device according to claim 31, wherein the illumination device comprises a further light source which generates white light which can be added to the emitted radiation.