WO1997042869A1 - Dispositif pour detecter une substance dentaire cariee et/ou notamment une reconstitution dentaire ayant la teinte des dents - Google Patents

Dispositif pour detecter une substance dentaire cariee et/ou notamment une reconstitution dentaire ayant la teinte des dents Download PDF

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Publication number
WO1997042869A1
WO1997042869A1 PCT/EP1997/002265 EP9702265W WO9742869A1 WO 1997042869 A1 WO1997042869 A1 WO 1997042869A1 EP 9702265 W EP9702265 W EP 9702265W WO 9742869 A1 WO9742869 A1 WO 9742869A1
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WO
WIPO (PCT)
Prior art keywords
light
tooth
emitted
optical fiber
optical
Prior art date
Application number
PCT/EP1997/002265
Other languages
German (de)
English (en)
Inventor
Verena Maria Petrou
Wieland Hill
Original Assignee
Gesellschaft zur Förderung der Spektrochemie und angewandten Spektroskopie e.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gesellschaft zur Förderung der Spektrochemie und angewandten Spektroskopie e.V. filed Critical Gesellschaft zur Förderung der Spektrochemie und angewandten Spektroskopie e.V.
Priority to AU28906/97A priority Critical patent/AU2890697A/en
Publication of WO1997042869A1 publication Critical patent/WO1997042869A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
    • A61B5/0088—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for oral or dental tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C19/00—Dental auxiliary appliances
    • A61C19/04—Measuring instruments specially adapted for dentistry

Definitions

  • the invention relates to a device for the detection of carious tooth substance and / or in particular tooth-colored tooth restorations.
  • This dental diagnosis is currently usually carried out by manual scanning and audiovisual testing with the aid of a mouth mirror and probe.
  • Hardness, gloss, color and so-called "denti" are the decisive criteria when differentiating carious and healthy tooth substance.
  • the diagnostic results are subjectively influenced by nature.
  • the assessment can be influenced by different colorations and hardness or scratchability of the hard tooth substances as well as by the tooth-like color in composite-compomer or ceramic restorations. to be pregnant. Problems can arise, particularly when treating a profunda cavity, and may have further therapeutic consequences if only very thin layers of hard substance are left over the tooth nerve and if the probe itself is scanned or if the assessment is incorrect, either an accidental The pulp is in danger of opening or residual caries is left.
  • it is a further disadvantage that such a manual inspection can be time-consuming and is therefore often only applied to a limited number of test points.
  • the object of the invention is to provide a solution with which carious tooth diseases can be recognized as precisely as possible and precisely localized.
  • This object is achieved according to the invention with a device of the type described in the introduction by means of a laser source to which a first optical fiber is connected, the free end of which can be directed onto the tooth substance, and a device for collecting the radiation emitted or emitted by the tooth substance after laser radiation
  • the light scattered on the tooth substance and originating from the laser source which is connected to an optical evaluation unit, with at least one optical filter for suppressing reflected or scattered laser light with unchanged wavelength in the light path of the emitted or scattered light is arranged.
  • laser light in particular the light of a laser emitting in the near infrared range, is suitable for distinguishing hard tooth substances according to their nature.
  • the light emitted or scattered by the tooth substance has clearly different spectra. This is due in particular to the Raman scattered light of the inorganic (above all hydroxyapatite) and organic (especially collagen) components contained in different proportions in the hard dental substances (enamel, cement, dentin) and a comparatively broadband emission from carious Hard tooth substances (probably fluorescence from microbial metabolites) are returned.
  • the ratios of the Raman intensities are known to be suitable as a measure of the type and mineral content of the hard tooth substances.
  • the intensity of the comparatively broadband emission or its relationship to that of the Raman bands can be used as a measure of the condition of the hard tooth substance.
  • the Raman scattered light of the restorations differs clearly in terms of spectral distribution from the Raman signals of the hard tooth substances and a pronounced broadband emission of carious substances.
  • the device according to the invention can advantageously be used in particular when a laser for removing tooth substance is already used as the dental treatment apparatus. This then only needs to be provided with appropriate additional equipment.
  • the device for collecting the light emitted or scattered by the tooth substance has a second optical fiber, which in the optical evaluation unit opens.
  • an optic for focusing the laser and for collecting the emitted or scattered light is arranged at the free end of the first optical fiber and the second optical fiber.
  • one or more optical fibers for the emitted or scattered light can, for example, be arranged concentrically around the first fiber, in order to enable simple handling and a space-saving arrangement of the apparatus to be inserted into the patient's mouth.
  • the free ends of the fibers for the emitted or scattered light can be collected.
  • an optical system is provided for connecting the laser to a third optical fiber and for transmitting the light emitted or scattered by the tooth substance from the third optical fiber into the second optical fiber, wherein the third optical fiber serves as a light path for the laser light and the emitted or scattered light.
  • a device designed in this way requires even less space, since in principle only one optical fiber is required in the end region.
  • This optical fiber is suitable for guiding the light in both radiation directions, since the light coming from the laser and the light emitted or scattered (used for detection) have clearly different wavelengths.
  • At least one optical one Filter for suppressing reflected or scattered laser light with an unchanged wavelength is arranged.
  • This filter serves to suppress the laser light which is thrown back considerably more intensely than the signals to be evaluated.
  • the optical evaluation unit preferably has optical elements for filtering and / or spectrally decomposing the emitted or scattered light (e.g. filters or light-decomposing components such as prisms or gratings) and one or more photoelectric detectors.
  • optical elements for filtering and / or spectrally decomposing the emitted or scattered light e.g. filters or light-decomposing components such as prisms or gratings
  • photoelectric detectors By suitably arranging one or more photoelectric detectors in the evaluation unit, it is possible in a simple manner to determine characteristic intensities for carious tooth substance compared to healthy tooth substance and thus to identify carious tooth substance.
  • the device is further characterized in that the optical evaluation unit has a display or registration device for light intensities which are unusual for detected healthy tooth substance, as a result of which the dentist is given a display and also an automatic registration option for the tooth image.
  • the optical evaluation unit is equipped with a circuit for controlling an ablation device for carious tooth substance. If the device is equipped in this way, it is possible to make the removal of hard tooth substance dependent on the dental substance diagnosis carried out simultaneously or promptly, that is, independently of any possible usage errors.
  • the ablation device can only be activated in the case of carious tooth substance or is deactivated as soon as there is no more carious tooth substance. This clearly prevents unnecessary removal of healthy tooth substance.
  • the laser source itself is designed as an ablation device for carious tooth substance.
  • a further laser source connected to a further optical fiber is provided as the removal device for carious tooth substance.
  • the ablation laser can be switched off very quickly using the control circuit, as a result of which unnecessary ablation can be avoided even better.
  • FIG. 1 is a schematic diagram of a device according to the invention according to a first embodiment
  • FIG. 2 shows a schematic diagram of a device according to a second embodiment
  • Fig. 3 is a schematic diagram of a device according to a third embodiment.
  • a device for the detection of carious tooth substance initially has a laser source 1, preferably a laser being used which emits radiation in the near infrared range. Such or a similar laser source 1 has already been used, for example, to remove hard dental substance.
  • a first optical fiber 2 is arranged, which supplies the laser light originating from the laser source 1 to the hard tooth substance indicated by 10 of a patient.
  • this first optical fiber 2 is provided at the free end with optics 3 for focusing the laser beam on the tooth material (not shown).
  • this optics 3 is provided with optical elements which make it suitable for collecting the light emitted or scattered by the tooth material, the optics additionally being equipped with filters for filtering out interfering light components.
  • a second optical fiber 4 is connected to the optics 3 and serves to return the light emitted or scattered by the tooth substance.
  • This second optical fiber 4 ends at the end in an optical evaluation unit, generally designated 5.
  • the optical evaluation unit 5 has optical elements (not shown) for filtering and / or specular decomposition, i.e. for wavelength-selective detection of the emitted light, on (wave selection e.g. through filters or light-separating components such as prisms or gratings).
  • one or more photoelectric detectors are suitably arranged in order to be able to carry out the wavelength-selective detection.
  • FIG. 4 shows, it has been found that the spectra of the healthy and carious tooth hardness Clearly distinguish between substance emitted or scattered light. If one compares, for example, the respective spectra (intensity in arbitrary units plotted on the Y axis, energy difference of the light quanta plotted on the X axis relative to the excitation), it is found that in particular in the range from 1000 to approximately 2500 cm "1 very different courses between the curves for healthy and carious tooth hard substance are obtained.
  • the values determined by these detectors can be very easily determine whether the tooth substance currently being examined is healthy or diseased without the need for complex evaluation elements
  • the detectors could also be arranged or designed such that signals from healthy and carious tooth substance are measured separately and their ratio (s) can be used to determine the state of the disease
  • the optical evaluation unit 5 can also be made more complex if a very precise diagnosis is desired.
  • the optical evaluation unit 5 also preferably has a display or registration device 6 for light that is unusual for detected healthy tooth substance. intensities to inform the dentist of the diagnostic result or to register it automatically.
  • the device 6 can also be equipped with an electrical circuit for controlling an ablation device 11 if automatic control of the ablation device 11 is desired in such a way that the device 11 for removing carious tooth substance is only recognized when carious defects are detected can be activated, ie it is then possible to automatically control the device 11 by means of the device according to the invention such that essentially only carious tooth substance is removed from it.
  • the removal device can be particularly advantageously a laser, in particular the laser source 1 itself.
  • FIG. 2 shows an alternative embodiment of the device according to FIG. 1, the same reference numerals as in FIG. 1 being used.
  • an optical system 8 for connecting the laser to a third optical fiber 9 and for forwarding the emitted or scattered light from the third fiber 9 into the second fiber 4 at the free end of the first and second optical fibers 2 , 4 provided.
  • the third optical fiber 9 serves as a light path both for the laser light coming from the laser source 1 and for the light emitted or scattered by the tooth substance, which in the optics 8 into the second light guide fiber 4 is steered.
  • a lens 7 can be arranged at the free end of the third optical fiber 9.
  • FIG. 3 shows a further embodiment of a device according to the invention, the same reference numerals as in the previous figures being used, provided the same parts are affected.
  • no optics 3 are required in this variant, rather one or more optical fibers 4 are preferably arranged concentrically around the free end of the first optical fiber 2 for the light emitted or scattered by the tooth substance 10.
  • the optical fibers 4 open directly into the optical evaluation unit 5.
  • This embodiment leads to a particularly space-saving arrangement of the apparatus to be inserted into the patient's mouth.
  • the light emitted or scattered by the tooth substance 10 is collected by the optical fibers 4 by suitably arranging their free ends near the free end of the first optical fiber 2.
  • the invention is not limited to the exemplary embodiments shown. Further configurations are possible without leaving the basic idea.
  • the optics 3 or 8 and / or the optical evaluation unit 5 Filters are provided, which are arranged in the light path of the emitted or scattered light. These filters are used to suppress reflected or scattered laser light with unchanged wavelength, in order to achieve a better evaluation of the light emitted or scattered by the tooth substance, since the reflected laser light is normally considerably more intensive than the signals to be evaluated.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Biophysics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Biomedical Technology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Epidemiology (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

Un dispositif pour détecter une substance dentaire cariée et/ou une reconstitution dentaire ayant la teinte des dents doit permettre de détecter et de localiser avec précision des caries dentaires. A cet effet, ce dispositif met en oeuvre une source laser (1) à laquelle est raccordée une première fibre optique (2) ont l'extrémité libre peut être dirigée sur la substance dentaire, ainsi qu'un système (3, 4) destiné à capter la lumière émise par la substance dentaire après l'exposition au rayonnement laser ou bien la lumière émanant de la source laser dispersée sur la substance dentaire, ce système (3, 4) étant lié à une unité d'évaluation optique (5). Au moins un filtre optique est disposé dans la trajectoire de la lumière émise ou dispersée, afin de supprimer la lumière laser réfléchie ou dispersée, de longueur d'onde inchangée.
PCT/EP1997/002265 1996-05-13 1997-05-03 Dispositif pour detecter une substance dentaire cariee et/ou notamment une reconstitution dentaire ayant la teinte des dents WO1997042869A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU28906/97A AU2890697A (en) 1996-05-13 1997-05-03 Device for detecting carious tooth material, and/or especially tooth-coloured tooth restoration

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19619067.3 1996-05-13
DE1996119067 DE19619067C2 (de) 1996-05-13 1996-05-13 Vorrichtung zur Detektion von kariöser Zahnsubstanz und/oder von insbesondere zahnfarbenen Zahnrestaurationen

Publications (1)

Publication Number Publication Date
WO1997042869A1 true WO1997042869A1 (fr) 1997-11-20

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/002265 WO1997042869A1 (fr) 1996-05-13 1997-05-03 Dispositif pour detecter une substance dentaire cariee et/ou notamment une reconstitution dentaire ayant la teinte des dents

Country Status (3)

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AU (1) AU2890697A (fr)
DE (1) DE19619067C2 (fr)
WO (1) WO1997042869A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10305062A1 (de) * 2003-02-07 2004-08-19 Carl Zeiss Meditec Ag Verfahren zur gewebeselektiven Behandlung in Therapie und Chirurgie
US7295574B1 (en) 2001-02-07 2007-11-13 Cortina Systems, Inc. Multi-service segmentation and reassembly device involving multiple data path integrated circuits

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10333515B4 (de) 2003-07-17 2016-11-24 Carl Zeiss Meditec Ag Verfahren und Vorrichtung zum Kenntlichmachen von zahnfarbenen Zahnfüllungsresten
EP2578200B1 (fr) 2011-10-04 2018-03-28 VOCO GmbH Compositions pour l'infiltration et/ou le scellement de la matière dentaire dure et procédé correspondant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015066A1 (de) * 1990-05-10 1991-11-14 Hans Wilhelm Bergmann Vorrichtung und verfahren zur automatischen kontrolle von zahnbehandlungen und chirurgischen eingriffen mit hilfe gepulster laser
DE9417470U1 (de) * 1994-10-19 1995-01-05 Dürr, Hartmut, Dipl.-Ing., 15366 Neuenhagen Vorrichtung zur Ermittlung von Strukturveränderungen an Objekten, insbesondere von kariösen Stellen an Zähnen
DE9317984U1 (de) * 1993-11-24 1995-03-23 Kaltenbach & Voigt Gmbh & Co, 88400 Biberach Vorrichtung zum Erkennen von Karies

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4200741C2 (de) * 1992-01-14 2000-06-15 Kaltenbach & Voigt Einrichtung zum Erkennen von Karies an Zähnen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015066A1 (de) * 1990-05-10 1991-11-14 Hans Wilhelm Bergmann Vorrichtung und verfahren zur automatischen kontrolle von zahnbehandlungen und chirurgischen eingriffen mit hilfe gepulster laser
DE9317984U1 (de) * 1993-11-24 1995-03-23 Kaltenbach & Voigt Gmbh & Co, 88400 Biberach Vorrichtung zum Erkennen von Karies
DE9417470U1 (de) * 1994-10-19 1995-01-05 Dürr, Hartmut, Dipl.-Ing., 15366 Neuenhagen Vorrichtung zur Ermittlung von Strukturveränderungen an Objekten, insbesondere von kariösen Stellen an Zähnen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7295574B1 (en) 2001-02-07 2007-11-13 Cortina Systems, Inc. Multi-service segmentation and reassembly device involving multiple data path integrated circuits
DE10305062A1 (de) * 2003-02-07 2004-08-19 Carl Zeiss Meditec Ag Verfahren zur gewebeselektiven Behandlung in Therapie und Chirurgie

Also Published As

Publication number Publication date
AU2890697A (en) 1997-12-05
DE19619067C2 (de) 2000-04-27
DE19619067A1 (de) 1997-11-20

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