EP3105558A1 - Dispositif à usage dentaire pour la distinction de la couleur des dents - Google Patents

Dispositif à usage dentaire pour la distinction de la couleur des dents

Info

Publication number
EP3105558A1
EP3105558A1 EP14802915.0A EP14802915A EP3105558A1 EP 3105558 A1 EP3105558 A1 EP 3105558A1 EP 14802915 A EP14802915 A EP 14802915A EP 3105558 A1 EP3105558 A1 EP 3105558A1
Authority
EP
European Patent Office
Prior art keywords
color
spacer
colors
database
pixels
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14802915.0A
Other languages
German (de)
English (en)
Inventor
Jordi PEREZ CASAS
Angelo Putignano
Walter DEVOTO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Style Idea Factory Ltda Soc
Original Assignee
Style Idea Factory Ltda Soc
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 Style Idea Factory Ltda Soc filed Critical Style Idea Factory Ltda Soc
Publication of EP3105558A1 publication Critical patent/EP3105558A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/508—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour of teeth
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0224—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using polarising or depolarising elements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0262—Constructional arrangements for removing stray light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0264—Electrical interface; User interface
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0272—Handheld
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
    • G01J3/524—Calibration of colorimeters

Definitions

  • the present patent for industrial invention relates to a device for dental use for discriminating the color of teeth.
  • the guide is a plastic or metal plate with a plurality of color samples shaped as a tooth, for example a front tooth.
  • the dentist removes one of the color sample from the guide and places it close to the patient's tooth so that the dentist can perceive the most accurate correspondence possible. After determining the color of the tooth, the information will be used in the following procedure. Obviously, such a method is random because it depends on the subjectivity of the dentist in making a visual assessment.
  • the composite materials that are used for restoration are already specified with the name of the range in the color scale, for example, one of the sixteen colors of the VitaTM scale. More particularly, if restoration is necessary, the color of the patient's tooth must be determined and perfectly perceived by the dentist or correctly informed to the laboratory in charge of making the reconstruction.
  • the procedure used to select the material for a specific tooth color implies some difficulties in the assessment and the production of the correct color match. If, for example, the dentist wants to make a restoration with shade A3 of the VITATM range, the materials are stratified on a model or directly in the tooth to be restored. Restoration is made with layers in order to obtain transparency as well as a natural look. Each layer has a specific color and intensity. In order to generate shade A3, the technician or the dentist must follow a recipe given by the manufacturer or self-manufactured that requires a different shade at every layer-
  • the color correspondence process can be additionally complicated if the dentist is not skilled in determining such information. For this reason, dentists often send their patients directly to a laboratory for a technician to determine the color information. Alternatively, dentists sometimes ask the technician to go and take the tooth color in the dental office. In both cases the risk is to create an additional level of subjective uncertainty in determining the patient's dental color. Therefore there is a need for additional improvement in this field.
  • the subjective color correspondence is evidently affected by many factors, such as the environment, the operator's skill, the perception, the color scale used and the different materials used to make the color scale. It is logical that objective color assessment methods must be used (for instance, spectrophotometer, and colorimeter).
  • Digital sensors perceive the light differently and each screen displays the images with slight differences compared to other screens.
  • LEDs and flash lights are extremely sensitive to the fabrication process and power supply. They are also sensitive to lenses and their coating protections and the color temperature of the light changes largely between flashes. Such a difference is even bigger in the LED industry and therefore this factor is extremely difficult to be standardized.
  • Images that are artificially lit are extremely sensitive to distance, especially in case of macro-photography, such as in the dental field. If the distance changes by 5 mm, the image will lose an important quantity of light (underexposure). On the contrary, if the subject to be photographed is 5 mm closer than the ideal distance, the image will receive excessive light (overexposure). Even with very small distance variations (+ or - 2mm), the changes in equalized images can be dramatic and they will surely make standardization impossible. The distance must be always the same with all instruments.
  • the "Through The Lens” (TTL) technology is the capability of the camera software to analyze the received light and adjust the entrance of the light in a very short time.
  • the TTL can analyze a scene either partially or totally, changing the result of the photo in an extremely easy way, especially if the background changes or if the subject becomes darker or lighter.
  • the camera will probably set off the dark color with a stronger light; on the contrary, in case of very white teeth, the camera will operate in the opposite way, making the scene darker and changing the standardized photograph.
  • Aperture - The aperture of the diaphragm determines the entrance of the light. The more open the diaphragm is, the lower the depth of field will be (difficult focusing); the more closed the diaphragm is, the higher the depth of field will be (easy focusing).
  • the speed indicates the speed of the shutter when closing or opening to let the light pass or the length of time for which the sensor will be exposed to the light. When the speed is lower, a higher amount of light will enter the scene, but the image risks to become “blurred”. On the contrary, if the speed increases, less light will enter in the scene and the image will be more stable.
  • the automatic focusing of digital cameras operates according to the same base of exposure and white balance, analyzing an average value of the complete or partial scene and thus relying on the scene characteristics for correct focusing. This function makes standardized photography almost impossible, unless the subject is at the same distance and in the same position with respect to the camera.
  • EP1528380 discloses a digital imaging system that comprises a spacer acting as dark room disposed in a camera of a cellular phone. Polarization filters and a calibration label are disposed in the spacer. The digital images of teeth taken by the device of the invention are sent to a database.
  • the spacer of EP1528380 has a cylindrical cavity with a truncated- conical end with decreasing diameter.
  • the shape of the spacer implies some inconveniences caused by the radial rebound of the light on the internal cylindrical wall of the spacer that creates reflections that cannot be eliminated with polarization filters.
  • a tooth has a rectangular shape and therefore the circular section of the spacer cavity does not allow for discriminating contour elements that are not part of the tooth, such as gums and palate.
  • the tooth color is related to a combination of an enamel layer and a dentin layer, i.e. two layers of materials with a different thickness and a different color that are overlapped in parallel direction. Consequently, multiple reflections and diffractions of the light are generated between the enamel layer and the dentin layer, thus causing an incorrect color perception with the naked eye and with a camera. Such an error is accentuated in the device of EP1528380, wherein no effective suppression of light reflections in the spacer is provided.
  • the calibration label of EP1528380 is of standard type and these types of standard calibration labels are not able to calibrate a correct tooth color according to the enamel and dentin layers of the tooth.
  • EP1528380 does not contain any precepts about how to remedy the color assessment error caused by the overlapped layers of enamel and dentin on the tooth.
  • WO2009/013687 and WO2007/034300 disclose the use of different calibration labels to correct the color of a digital image taken with a camera, such as for example the image of a tooth.
  • these documents do not contain any precepts about how to remedy the color assessment error caused by the overlapped layers of enamel and dentin on the tooth.
  • the purpose of the present invention is to eliminate the inconveniences of the prior art, by devising a device for dental use for discriminating the color of teeth, which is accurate, reliable, versatile, inexpensive and easy to use.
  • Fig. 1 is an exploded perspective view of the parts of the device according to the invention ;
  • Fig. 2 is a bottom view of a case of the device of Fig. 1 ;
  • Fig. 3 is a top view of the case of Fig. 2;
  • Fig. 4 is a front view of the case of Fig. 2;
  • Fig. 5 is a side view of the case of Fig. 2;
  • Fig. 6 is a top view of the calibration label of the device of Fig. 1 ;
  • Fig. 7 is a block diagram that shows the operation of the device of the invention .
  • Fig. 8 is a block diagram that shows the buttons used to activate the functions of the device of the invention .
  • Fig. 9 is a flow diagram that illustrates the tooth color discrimination process of the invention.
  • the device for dental use according to the present invention is disclosed, which is generally indicated with reference numeral (1 ).
  • the device (1 ) comprises a cellular phone (2) and a case (3).
  • the cellular phone (2) is provided with a digital photo or video camera (20). Therefore the back side of the cellular phone (2) is provided with a lens (21 ) of the camera and a light source (22) acting as flash.
  • the cellular phone (2) is of known type and can be any cellular phone provided with a digital photo camera that is normally available on the market.
  • the cellular phone (2) is a cellular phone produced by Apple and known with the trade name IphoneTM.
  • the case (3) comprises a base plate (30) with rectangular shape and with the same dimensions as the cellular phone.
  • Lateral walls (31 ) protrude from the base plate (30) in such manner to define a parallepiped housing adapted to receive the cellular phone (2).
  • the height of the lateral walls (31 ) is substantially the same as the thickness of the cellular phone (2).
  • some lateral walls (31 ) of the case are provided with openings (32, 33, 34) to leave the services of the cellular phone provided on the borders of the cellular phone, such as buttons, connectors and the like, uncovered.
  • the base plate (30) may be provided with an opening (35) with circular shape in order to make the logo of the cellular phone (2) visible.
  • a first polarization filter (4) and a second polarization filter (5) are disposed in proximity to a corner of the base plate (30) of the case, in such manner to be respectively in correspondence of the lens (21 ) and the light source (22) of the digital camera of the cellular phone, when the cellular phone (2) is inserted into the case.
  • the filters (4, 5) cover the lens (21 ) and the light source (22) of the cellular phone independently.
  • the filters (4, 5) are linear polarization filters disposed in such manner to polarize the light in orthogonal directions in order to produce light with zero reflections.
  • the first filter (4) is disposed in such manner to obtain a vertical polarization
  • the second filter (5) is disposed in such manner to obtain a horizontal polarization.
  • the polarization filters (4, 5) pass through the base plate (30) of the case and protrude externally from the base plate (30).
  • a holding plate (6) is mounted on the base plate (30) of the case in such manner to hold the polarization filters (4, 5).
  • a spacer (7) is mounted, having an axial cavity (70) with axis orthogonal to the base plate (30) and a border (71 ) adapted to come in contact with the tooth to be photographed.
  • the axial cavity (70) of the spacer has a tapered truncated-pyramidal shape with increasing dimensions going from the case (3) outwards.
  • the truncated pyramidal shape of the cavity (70) of the spacer (7) creates orthogonal light reflections that are totally suppressed by the polarization filters (4, 5) in mutual orthogonal position.
  • the spacer acts as dark room and therefore the lateral walls of the spacer are black or opaque in order to prevent the light from passing.
  • the spacer (7) is coated with black neoprene foam.
  • the spacer (7) has a length of approximately 80 mm, in such manner that the distance between the lens (21 ) of the digital photo camera (20) of the cellular phone and the tooth to be photographed is higher than 78 mm. Such a distance is the ideal distance to guarantee the best performance of the macro lenses of cellular phones.
  • the combination of the spacer length, the truncated-pyramidal shape of the cavity of the spacer (7) and the crossed polarization of the polarization filters (4, 5) allows for completely eliminating the reflections of the light inside the spacer and flatten the image of the enamel and dentin layers, thus obtaining a single color.
  • a calibration label (8) for color control is disposed inside the spacer (7), in correspondence of the border (71 ) of the spacer.
  • the calibration label (8) has a rectangular shape and occupies approximately half surface with respect to the cross-section of the spacer (7).
  • the calibration label (8) comprises a square central portion (80) with pure white color, provided with a focusing target (81 ) having a circular shape with 12 mm diameter.
  • the focusing target (81 ) is provided in correspondence of the lens (21 ) of the camera of the cellular phone.
  • a lateral band with three rectangular flags (82, 83, 84), respectively with Yellow, Magenta and Cyan color, is provided.
  • a lateral band with three rectangular flags (85, 86, 87), respectively with Black, 50% gray and 18% gray color, is provided.
  • the label (8) is used for balancing whites and colors and for exposure and focusing before and after taking the photograph.
  • the label (8) is obtained with silk-screening technique on paper with opaque silicone inks, without coloring agents or other metameric pigments.
  • the calibration label (8) is not a standard label, being personalized according to colors that are especially studied for reconstructing the colors of the tooth enamel and dentin.
  • the calibration label (8) has a rectangular shape and the opening of the border (71 ) of the spacer has a square shape.
  • the dimensions of the calibration label (8) and of the opening of the border (71 ) of the spacer are such that a rectangular shooting range is obtained with dimension 20 mm x 12 mm.
  • Such shape and size of the shooting range is essential to follow the rectangular shape of teeth and allows for discriminating foreign elements, such as palate and gums.
  • the device (1 ) comprises an anti-contamination protection (9) adapted to be disposed on the border (71 ) of the tip of the spacer (7) with snap-on coupling, such as a removable cap.
  • the anti- contamination protection (9) has a transparent portion (90) to allow for taking a photograph.
  • the anti-contamination protection (9) is made of plastic and is of disposable type. The protection (9) is used to prevent the spacer (7) from getting in contact with the oral tissues and with humidity, and acts as barrier for infections.
  • the case (3) is designed according to the specifications of the cellular phone (2) in order not to cover the devices of the cellular phone, such as: distance sensors, earplugs connectors, battery charge and mini-plug audio cable, switch-on button and volume buttons, screen-locking button, Home button, front camera and loudspeaker.
  • the minimum distance for perfect focusing with the macro function of the iPhone is 78 mm.
  • the length of the spacer is 80 mm because this distance allows for focusing an object with the maximum resolution and enlargement possible, thus allowing for 2 mm tolerance.
  • the images are taken through a spacer having an axial cavity with truncated-pyramidal shape that guarantees a constant distance and a minimum variation.
  • Diaphgram - Depth of field - Speed - ISO - White balance will be always the same for each photograph because they are calibrated with respect to a sample of known characteristics (label 6), with the same light (i-Phone flashes (22)), the same distance (imposed by the spacer (7)) and therefore the same shooting conditions.
  • TTL - All measurements are made through the lenses (TTL) concentrating them on the same sample. The quantity of light and lighting on the scene will always be the same, although small variations of the flash temperature are possible.
  • Focusing - It will be always the same because the measurement is made in the calibration label (8) where a special focusing target (81 ) is provided, with the same light, distance and scene conditions.
  • White balance - It is done in the central portion (80) of the calibration label (8) with paper colored with pure white. Therefore white balance will be always the same because it is calibrated in the balance label, with the same light, the same distance and the same shooting conditions.
  • the digital sensors (CCD) used in digital camera can have small variations from device to device.
  • digital sensors are digitally calibrated with the calibration label (8) in order to set off luminous deviation.
  • the light source (22) can have slight variations from device to device. Therefore the light source (22) is calibrated digitally with the calibration label (8) to set off any luminous deviation.
  • the device (1 ) of the invention comprises the following functions:
  • Focusing target It consists in an especially designed grid (81 ) that is similar to an aim and provides the autofocus in order to calilbrate efficiently and exactly in the same way every time a photograph is taken.
  • reflection-free images can be analyzed numerically, having eliminated any undesired reflection. Moreover, they allow the user to observe the tooth and assess the tooth color more easily, with a better understanding of depth and transparency. Hyper- contrast images, i.e. images with brighter colors, are obtained with this light.
  • the spacer (7) is coated with black neoprene foam that eliminates the interference of internal light and insulates the external light. The close distance between the subject and the spacer (7) also blocks the external light efficaciously.
  • Exposure balance -. I is made on the calibration label (8), always obtaining the same exposure balance.
  • Focus constancy -. I is made on the calibration label (8), always obtaining the same focusing. The object will be out of focus only if it is not placd at the correct distance, i.e. in contact with the cone.
  • Colors 1 , 3 and 4 are the standard for the classical white balance. Color 2 is added to improve the elimination of undesired colors. Colors 5, 6, and 7 are the purest expression of the primary colors in the subtractive color system, i.e. pure colors without any mixture of other colors. When all colors are found in a digital image, each single variation will appear on at least one of the colors contained in these standards, given the fact that all color ranges are covered. The normalized image will be analyzed and compared in a large database of standardized images.
  • Aperture - It is a characteristic of the camera (20) of the cellular phone (2). Because of the small diameter of the video camera (20), the aperture is very small and therefore a correct depth of field is always obtained with the standardized light conditions obtained with the device of the invention.
  • the cellular phone (2) is provided with a software application to control the operation of the device (1 ) of the invention.
  • a database (100) is stored in the cellular phone, which comprises digital sample images that univocally identify sample colors.
  • the sample colors of the database are calibrated with a three-dimensional element comprising an enamel layer with thickness of 0.5mm and a dentin layer with thickness of 2mm. Such a calibration of the sample colors in the database allows for taking into account the color detection error possibly made by the device (1 ).
  • the cellular phone (2) is equipped with a comparison software (101 ) that compares a digital image (D) taken with the device (1 ) with the digital sample images stored in the database (100). Therefore, the comparison software (101 ) provides information (I) to discriminate the color of the photographed image (D) according to the sample colors of the digital sample images stored in the database (100).
  • Discrimination is made by reading the color values of pixels in the digital photographed image (D) and by comparing them with the values of the sample colors contained in the database (100). In fact, each pixed has a color value that is compared with the color values of the sample colors in the database (100).
  • the comparison and discrimination method provides for a continuous cycle statistic analysis, which comprises the following steps: a) select, wherein an area comprising a plurality of pixels of the digital image (D) photographed with the device (1 ) is selected,
  • step b) comparison wherein the average values of the most frequent colors are compared with the values of the sample colors of the database; if the average value does not correspond to any value of the sample colors of the database, the method returns to step b),
  • the software of the device (1 ) comprises the functions activated with the buttons shown in Fig. 8.
  • Take photo it activates the entire system to take a photo, it switches the LED flash (22) on and it calibrates the focusing, white balancing and exposure on the calibration label (8).
  • Right/left keys keys used to take a photo, which can be accessed from the left and the right side of the screen for a better ergonomics while taking a photo.
  • Accelerometer The accelerometer will automatically determine whether the cellular phone (2) is positioned to photograph either the upper or the lower teeth.
  • Pop-up If desired, before making the photo session, a pop-up window is displayed in order to enter the patient's data. After taking the photo, another pop-up window is displayed, which allows the user to save, delete or analyze the captured image.
  • the "Save” function will store the photo in the archive and will return to the camera mode, the "Delete” function will delete the image and return to the camera mode.
  • the “analyze” button will start the analysis of the image, which will be compared with the images in the database to find the correct correspondence.
  • Archive the photographic archive is ordered in folders with a label with the patient's name and a sub-label with the file number.
  • the label of images without pre-entered data will include the date and the hour as sub-label.
  • Each session will be considered as a new patient.
  • the session will expire when the user leaves the "camera mode" (all the images of the session will be saved in the same folder).
  • the user can edit the patient's name and the file number at any time.
  • the list of folders can be sorted by alphabetical order or by date.
  • Patient After selecting the folder to be examined, the user will have access to the images.
  • the extension of the images contains the date and the tooth reference number.
  • Analyze When this button is pressed by the user, the system makes a comparison in different points of the digital image of the photographed tooth, inside a defined area of the tooth, and searches for the most repeated values of colors that correspond to the sample colors of the images in the database. Then a diagnosis of the color is given and a list of equivalence for the tooth color is provided.
  • Image anatomical centering When the analysis is started, different pre-loaded anatomical figures will appear to determine the tooth contour.
  • the tooth pre-loaded contour can be enlarged or reduced in order to increase and decrease the size according to the tooth.
  • Tooth sliding shapes The pre-loaded tooth shapes can be browsed with the "slide" movement, which will take the user to the following shape. For instance, if tooth 1 1 is displayed and the user slides to the right, the following tooth to be displayed on the screen will be tooth 12.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Spectrometry And Color Measurement (AREA)

Abstract

L'invention concerne un dispositif (1) à usage dentaire pour la distinction de la couleur des dents, comprenant : un téléphone cellulaire (2) muni d'un appareil photo numérique (20) comprenant une lentille (21) et une source de lumière (22) faisant office de flash, un boîtier (3), une pièce d'espacement (7) montée sur le boîtier (3) en correspondance avec la lentille (21) et la source de lumière (22), un premier filtre de polarisation (4) et un deuxième filtre de polarisation (5) disposés à l'intérieur de la pièce d'espacement (7), respectivement sur ladite lentille (21) et sur ladite source de lumière (22), une étiquette de calibrage (8) disposée dans la pièce d'espacement (7), une base de données (100) contenant une pluralité d'échantillons d'images numériques qui définissent de manière univoque des échantillons de couleur, et un logiciel de comparaison (101) pour comparer l'image numérique de la dent capturée avec le dispositif (1) auxdits échantillons d'images de la base de données (100) afin de distinguer la couleur de la dent photographiée.
EP14802915.0A 2013-12-05 2014-11-27 Dispositif à usage dentaire pour la distinction de la couleur des dents Withdrawn EP3105558A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITAN20130233 2013-12-05
PCT/EP2014/075805 WO2015082300A1 (fr) 2013-12-05 2014-11-27 Dispositif à usage dentaire pour la distinction de la couleur des dents

Publications (1)

Publication Number Publication Date
EP3105558A1 true EP3105558A1 (fr) 2016-12-21

Family

ID=49920383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14802915.0A Withdrawn EP3105558A1 (fr) 2013-12-05 2014-11-27 Dispositif à usage dentaire pour la distinction de la couleur des dents

Country Status (5)

Country Link
EP (1) EP3105558A1 (fr)
AR (1) AR098632A1 (fr)
HK (1) HK1232285A1 (fr)
TW (1) TW201521686A (fr)
WO (1) WO2015082300A1 (fr)

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