Oral image acquisition kit

Abstract

The invention discloses an image acquisition kit (1) comprising: an extraoral image acquisition device (2) comprising: a support (4) provided with a mouthpiece (9) defining a mouthpiece opening (17); image acquisition means (5) attached to the support and comprising a camera (35) for acquiring at least one image of a tooth scene seen through the mouthpiece opening (17); and a display device (3) comprising a screen for displaying an image representative of the scene captured by the image capture device, the image capture device comprising an additional screen and / or the support defining an image capture chamber (15) in which the image capture device is housed at least partially, preferably completely.

Description

[0001] The present invention relates to a kit for acquiring images of a dental scene from a vantage point outside the mouth and for visualizing the corresponding images.

[0002] For example, it is known from WO 2016 / 066651 A1 that the progress of a patient's orthodontic treatment can be monitored by comparing the evolution of an orthodontic model generated from images of the patient's lower and upper dental arches acquired before the orthodontic treatment with images of the arches acquired during the orthodontic treatment.

[0003] The image of the dental arch can be acquired using an image acquisition device comprising an image acquisition device and a mouthpiece. Examples of such image acquisition devices are described in EP 3391 810 A1 and WO 2022 / 008533 A1, which include a tubular hollow support carrying a mouthpiece at one end and a mobile phone mounted at the opposite end, the mobile phone being equipped with a camera directed toward the patient's mouth to acquire an image of the dental arch. The images can then be transmitted to an orthodontist or dentist who can analyze them directly or after appropriate digital processing.

[0004] However, patients using the devices of EP 3 391 810 A1 and WO 2022 / 008533 A1 cannot directly observe the images they acquire on the mobile phone screen, because the mobile phone camera is positioned on the side opposite to the screen. Furthermore, to give a command to acquire an image, they may need to press the touch screen of the phone. To avoid these problems, they must use a mirror, which is impractical.

[0005] Therefore, this shortcoming needs to be corrected.

[0006] The present invention proposes an image acquisition kit, which includes:

[0007] A device for extraoral photography, comprising:

[0008] ○Supporting parts,

[0009] o a mouthpiece defining a mouthpiece opening and carried by the support,

[0010] o an image acquisition device attached to the support and comprising a camera for acquiring at least one image of a dental scene seen through the mouthpiece opening, and

[0011] a display device comprising a screen for displaying an image representing a scene acquired by the image acquisition means,

[0012] The image acquisition device preferably comprises an additional screen and / or a support defining an image acquisition chamber, in which the image acquisition device is preferably at least partially, preferably completely, accommodated.

[0013] Thus, a user of the kit can view an image directly after the image capture device captures the image. For example, with the mouthpiece positioned in the user's mouth, the user can easily check the quality of the image (e.g., contrast and / or brightness) and / or can move the image acquisition device relative to their dental arch to capture the image from another vantage point (e.g., a vantage point more suitable for representing the dental scene).

[0014] Furthermore, using a kit according to the invention can reduce light pollution caused by the use of mirrors.As mentioned above, mirror viewing is often performed in bathrooms, where a certain strong light is often associated with mirrors and can interfere with image acquisition.

[0015] The "extraoral" images are captured using an image acquisition device that, in an operational configuration with the mouthpiece inserted into the user's mouth, positions the image acquisition device outside the user's oral cavity. The extraoral images are captured from a location remote from the oral cavity.

[0016] The display device is preferably movable relative to the image acquisition device.

[0017] The display device may be selected from a mobile phone, a digital tablet, a desktop computer, in particular a portable computer, or a television, in particular a connected television.The display screen may be touch sensitive.

[0018] Preferably, the kit includes a communication module for transmitting the image acquired by the image acquisition device to the display device. The communication module can be a wireless communication module, specifically a wireless network type module, for example, using or Data transmission protocol. Specifically, the image acquisition device may include a wave transmitter for transmitting the image acquired by the image acquisition device, and the display device may include a wave receiver for receiving the image.

[0019] In one embodiment, the communication module comprises a data transmission cable, for example of USB type, for connecting the image acquisition device to the display device, and the image acquisition device and the display device each comprise a connection socket for plugging in the data transmission cable.

[0020] The kit may further comprise a control module for triggering image acquisition.The image acquisition device and / or the display device may comprise a control module.

[0021] The control module preferably includes a computer program and a processor, the computer program including instructions for guiding a user to position the image acquisition device at at least one image acquisition position, and the processor is used to execute the computer program. Specifically, in a variant in which the acquisition device is accommodated in the image acquisition chamber, the control module is accommodated in the display device.

[0022] The computer program may include instructions for processing the acquired images so as to provide at least one piece of information to the user. The information may be audible, such as in the form of a voice message, so as to position the device relative to the user's dental arch to obtain a predetermined acquisition position and / or orientation, and optionally specify to the user the number of images to be acquired. If desired, the image acquisition device and / or display device may also include a speaker for broadcasting the information. The information may be visual and may be displayed on a screen, alongside or visually superimposed on the displayed image.

[0023] This information may be selected from the number of images to be acquired, information related to the setting of the support geometry, the orientation of the support and / or the positioning of the user's mouth on the mouthpiece.

[0024] The computer program may also include instructions for requesting and / or waiting for a user action, such as triggering image acquisition. For example, after being executed by the processor, the computer program may require pressing an area of ​​a touch screen of the display device. As another example, the computer program may wait for a voice command from the user. Specifically, for this purpose, the image acquisition device and / or the display device may include a microphone.

[0025] The control module may include an actuator and is configured to trigger image acquisition by the acquisition device after actuating the actuator. For example, the actuator is electrically connected to the acquisition device. For example, the actuator is a button. The actuator may be carried by a support.

[0026] The control module can be configured to detect the presence of patterns and / or objects in the scene seen by the camera and trigger image acquisition once the patterns and / or objects are detected. For example, pattern and / or object detection is performed using deep learning algorithms or computer vision techniques.

[0027] The control module is preferably configured to trigger the transmission of the image acquired by the image acquisition device to the display device. The control module can be configured so that the image transmission is performed in real time, that is, the screen displays the image acquired by the acquisition device in real time. "Real time" is understood to mean that the time between the acquisition and display of the image is less than 1s, or even less than 500ms, or even less than 10ms.

[0028] According to a variant in which the display device comprises a control module, it is worth noting that the control module can send at least one control signal to the image acquisition device via the communication module.

[0029] The image acquisition device and / or the display device may include a storage module, such as a hard disk or a flash memory, in order to digitally store the images acquired by the acquisition means.

[0030] The camera may have a focal length between 25 mm and 90 mm, preferably between 30 mm and 45 mm.

[0031] The focal length of the camera may be fixed so that a portable camera can be used. In one variant, the camera may include an autofocus system that changes the focal length.

[0032] The camera may extend along an axis parallel to the longitudinal axis of the support or even coincident with the longitudinal axis of the support.The line of sight of the camera may be parallel to the longitudinal axis of the support or even coincident with the longitudinal axis of the support.

[0033] The image acquisition device may include, or even consist of, a plurality of cameras. The cameras may be arranged along different lines of sight and may be arranged to each acquire a different view of the same dental scene. The image acquisition device may thus provide a stereoscopic view of the dental scene. The cameras may have the same focal length.

[0034] The image acquisition device may be fixed relative to the mouthpiece. In this way, the image acquisition apparatus enables the acquisition of images at different times under similar conditions during the orthodontic process. Similar acquisition conditions include the position and relative orientation of the image acquisition device relative to the patient's teeth. In one embodiment, the image acquisition device is movable relative to the mouthpiece.

[0035] The support member may include a hollow, longitudinally extending support portion, and the mouthpiece may extend the hollow support portion. The hollow support portion may be grippable. The hollow support portion may have reliefs and / or grooves shaped to ensure optimal gripping of the image acquisition device.

[0036] The image acquisition device is shaped such that in the operating configuration the hollow support portion is at least partially, preferably completely, located outside the user's mouth.

[0037] The hollow support portion may be made of cardboard or, preferably, of a thermoplastic material.

[0038] The hollow support portion may be in the form of a longitudinally extending housing opening that passes substantially only outwardly through the mouthpiece opening and optionally through a ventilation opening, e.g. longitudinally opposite the mouthpiece opening. In an operational configuration of the image acquisition device, the ventilation opening facilitates the discharge of moist air exhaled by the user. The hollow support portion may be substantially cylindrical in shape.

[0039] The hollow support portion may include a bottom wall, such as a solid bottom wall longitudinally opposite the mouthpiece opening.The image capture device may be in contact with or attached to the rear wall.

[0040] The hollow support portion may be sandwiched between the mouthpiece and the image acquisition device.

[0041] Preferably, the hollow support portion defines an image acquisition chamber. Alternatively, the image acquisition device according to a second embodiment described below is preferably remote from the image acquisition chamber.

[0042] The length of the hollow support portion measured along the longitudinal axis is less than 15 cm, preferably less than 10 cm.

[0043] At least the hollow support portion or even the support element may be telescopic, ie the length measured along its longitudinal axis may be variable. For example, the support element may consist of a plurality of parts which slide into each other.

[0044] In one variation, the support further comprises a grippable support portion mounted on the hollow support portion such that the device can be manipulated by gripping the grippable support portion.

[0045] The grippable support portion may extend longitudinally and protrude laterally from the hollow support portion.

[0046] Preferably, the hollow support portion is arranged between the mouthpiece and the grippable support portion.

[0047] The hollow support portion may be removably attachable to the grippable support portion, for example.Preferably, the grippable support portion and the hollow support portion form an integral assembly.

[0048] The grippable support portion may define a chamber and include a cover closing the chamber. The device may include a printed circuit board and / or a battery for controlling and / or powering the image acquisition device, which is preferably accommodated in the chamber. The chamber may also be made watertight, in particular by means of one or more seals.

[0049] Furthermore, the battery may be self-contained. The battery may be charged by induction or by a wired connection such as USB. The battery may be powered directly by a wired electrical connection to an external power source.

[0050] The hollow support portion and / or the grippable support portion may be at least partially covered by a flexible material that facilitates gripping, such as a thermoplastic elastomer called "TPE", specifically a thermoplastic rubber called "TPR", such as styrene-butadiene-styrene, or a thermoplastic polyurethane called "TPU".

[0051] The mouthpiece is preferably shaped so as to move upward and downward, respectively, and preferably curl the upper and lower lips of the user, in an operating configuration of the image acquisition device (in which the mouthpiece is introduced into the mouth of a user of the image acquisition device) so as to maximize the tooth surface visible to the image acquisition device. "Up" and "down" refer to directions along a vertical axis when the user of the image acquisition device is standing upright. Preferably, the mouthpiece is shaped so that when in at least one position of the operating configuration of the image acquisition device (in which the mouthpiece is inserted into the mouth of the user), the upper and lower lips move upward and downward, respectively, and preferably curl, so that at least the incisors and preferably at least part of the canines and / or molars of the upper and lower dental arches, respectively, are visible to the camera.

[0052] The mouthpiece may be integral with the support, in particular with the hollow support portion. In other words, the mouthpiece and the support, in particular the hollow support portion, may be obtained together in the same manufacturing operation. The hollow support portion and the mouthpiece may be produced by molding and / or additive manufacturing.

[0053] Alternatively, the mouthpiece may be mounted on the hollow support portion. The mouthpiece may be attached to the support, specifically to the hollow support portion. For example, the mouthpiece is snapped, threaded or glued to the support, specifically to the hollow support portion. Alternatively, the mouthpiece can be removably mounted on the support, specifically to the hollow support portion, for example by a magnetic coupling, using hook-and-loop fasteners or by a profile fit between the support (specifically the hollow support portion) and the mouthpiece. Advantageously, different mouthpieces of different sizes can be mounted on the support, specifically to the hollow support portion, and thus the mouthpiece that best suits the morphology of each user's mouth is selected.

[0054] Preferably, the surface area covered by the mouthpiece opening is greater than 2 cm 2 , preferably greater than 3cm 2 , more preferably greater than 5 cm 2 , more preferably greater than 10 cm 2 , or even larger than 15cm 2 , for example about 19cm 2 Preferably, the surface area is less than 30 cm 2 , more preferably less than 25 cm 2The area is measured transversely to the longitudinal axis. The contour of the mouthpiece opening may be defined by viewing the image acquisition device along the longitudinal axis from a position opposite the image acquisition device along the longitudinal axis.

[0055] The image acquisition device may include a mirror attached to the support so that the image acquisition device acquires a composite image including a direct image of the mouthpiece opening and an image of the mouthpiece opening reflected by the mirror. Thus, in the use configuration, the image acquisition device sees a composite image including a direct image of the teeth directly observed through the mouthpiece opening and a reflected image of the teeth reflected by the mirror.

[0056] Alternatively, the image acquisition device may include a light source arranged to shine through the mouthpiece opening.

[0057] The light source may comprise at least one lamp, in particular a light emitting diode lamp, and / or a flash device.

[0058] The light source is preferably located in the image acquisition chamber.

[0059] The image acquisition device may include a control module to monitor the characteristics of the radiation emitted by the light source, specifically as a function of the light radiation received through the mouthpiece opening. For example, the control module may be configured so that more than 50%, more than 90%, or even substantially 100% of the radiation received by the mouthpiece opening comes from the light source.

[0060] In particular, the image acquisition device may include several light sources and several cameras, each light source being arranged to illuminate a light field of a corresponding camera. The light source may be accommodated in a housing.

[0061] In order to determine the color and / or translucency of the user's teeth, the image acquisition device may comprise a colorimetric target and / or a translucency target, respectively, attached to the support, wherein the image acquisition device observes said targets.

[0062] In addition, the image acquisition device may further include one or more additional cameras, which, in at least one configuration of the image acquisition device, can be positioned in the user's mouth to capture at least one intraoral view of the lower dental arch and / or the upper dental arch, thereby facilitating the acquisition of images of, for example, the lingual surface of the teeth, interdental spaces, caries control or palatal control. Specifically, the image acquisition device may include a telescopic arm extending between a folded configuration and at least one unfolded configuration, and the additional camera is mounted on the telescopic arm. Preferably, in the folded configuration, the additional camera is completely housed in the bracket. Preferably, in the operating configuration of the image acquisition device and in the unfolded position of the arm, the additional camera is positioned in the user's mouth to capture at least one intraoral view of the lower dental arch and / or the upper dental arch.

[0063] In addition, in the first embodiment described below, the image acquisition device is at least partially accommodated in the image acquisition chamber. Preferably, the image acquisition device also has a width of less than 40 cm. 3 In addition to the above features, according to the first embodiment, the kit may have any one of the following features.

[0064] Preferably, the distance between the camera and the dental retractor is less than 15 cm, preferably less than 7 cm, preferably less than 6 cm, and most preferably greater than 2.5 cm.

[0065] The dental retractor defines an upper bearing surface and / or a lower bearing surface for contacting and displacing a lower lip and / or an upper lip of a user, respectively, in a use position of the device in which the oral piece is inserted into the user's mouth. The distance between the oral piece and the image acquisition device is the minimum distance between the lower bearing surface of the oral piece and the image acquisition device or between the upper bearing surface of the oral piece and the camera.

[0066] The image acquisition device may comprise an additional screen. Preferably, the image acquisition device does not have an additional display and / or a telephone communication unit. Preferably, the image acquisition device is not embedded in a mobile phone. Preferably, the image acquisition device is different from the mobile phone.

[0067] In a second embodiment, the image acquisition device comprises an additional screen.In addition to the above features, according to the second embodiment, the kit may have any one of the following features.

[0068] Specifically, the image acquisition device can be as described in EP 3 391 810 A1 or WO 2022 / 008533 A1.

[0069] Specifically, the image acquisition device is a mobile phone, which can store the above-mentioned computer program in a digital manner.

[0070] Preferably, the image acquisition device is removably mounted on the support. Specifically, before being mounted on the support, the acquisition device can be configured to detect the support, for example from a distance of less than 10 cm, so as to trigger the execution of the computer program.

[0071] For example, the support includes a detection element such as an RFID or NFC chip, which can be detected by the image acquisition device.

[0072] The display device may be configured to deactivate display on the additional screen. In a variant where the image acquisition device is a mobile phone, the display device may be configured to disable access to the mobile phone network to prevent the user from being interrupted by a phone call during image acquisition.

[0073] The kit according to the second embodiment may comprise any of the features of the kit according to the first embodiment, and vice versa.

[0074] The present invention also relates to a method for obtaining an extraoral image using the photography kit described herein, the method comprising:

[0075] a) grasping the support member and positioning the mouthpiece in the user's mouth,

[0076] b) capturing at least one image of the user's lower dental arch and / or upper dental arch by an image capturing device, and

[0077] c) Displaying the image visible to the user on a display device.

[0078] Positioning of the image acquisition device is thereby greatly facilitated, since the user can directly visualize the image acquired by the image acquisition device. The operator, who may be the user, can thus move the support to a desired and / or optimal acquisition position while viewing the corresponding image of the dental arch on the display device. Preferably, the method further comprises the user moving, for example, the image acquisition device relative to the user's mouth after observing the image displayed on the screen.

[0079] In step a), the mouthpiece is positioned so that the user's lower and upper lips can be separated to improve visibility of the lower and upper dental arches, respectively.

[0080] The gripping and / or positioning of the support may be performed by an operator other than the user.

[0081] In step b), the user may be guided by executing a computer program as described above. When the mouthpiece is inserted into the user's mouth, the acquisition may be automatically triggered. The method may include measuring the light intensity in the image acquisition chamber and triggering image acquisition when the light intensity drops below a predetermined minimum light intensity.

[0082] Image acquisition can be triggered by a user or by an operator other than the user, for example in response to information provided by the control module. The user can trigger acquisition by issuing a control command that is read by the image acquisition device and / or the display device. The control command is, for example, the actuation of a button attached to the support or the pressing of a touch screen of the display device.

[0083] In step b), multiple images may be acquired. They may be acquired continuously, i.e. the image acquisition device acquires images continuously after a single acquisition trigger, specifically at a fixed acquisition frequency. According to step c), the images may be displayed in real time on a display device.

[0084] Preferably, the display device is separated from the image acquisition means by a distance of less than 5 m or even less than 1 m and preferably more than 20 cm.

[0085] Preferably, the method comprises processing images acquired at one position of the image acquisition device and preferably generating information for a user. Preferably, the information is displayed by a display device.

[0086] The present invention will be better understood from the following detailed description and accompanying drawings, in which:

[0087] [ Figure 1 ] shows an example of an image acquisition kit according to the present invention,

[0088] [ Figure 2 ] is a perspective view of an example of an image acquisition device,

[0089] [ Figure 3 ]yes Figure 2 A cross-sectional view of a longitudinal plane of the image acquisition device shown,

[0090] [ Figure 4 ]and[ Figure 5 ] is a perspective view from a different vantage point of another example of an image acquisition device,

[0091] [ Figure 6 ] schematically illustrates an exemplary embodiment of an image acquisition method using a kit according to the present invention. DETAILED DESCRIPTION

[0092] Figure 1 An example of an image acquisition kit 1 according to the invention is shown.

[0093] The kit 1 includes an image acquisition device 2 and a display device 3 .

[0094] The image acquisition device 2 includes a support 4 and an image acquisition device 5. The image acquisition device 5 may have a diameter less than 40 cm. 3 volume, making the image acquisition device particularly compact.

[0095] The support member 4 comprises a hollow support portion 7. The device further comprises a mouthpiece 9.

[0096] The hollow support portion 7 has a generally elongated tubular shape extending along a longitudinal axis X. The hollow support portion comprises a hollow tubular portion 11 and a bottom wall 13 closing one longitudinal end of the tubular portion. The tubular portion 11 and the bottom wall 13 delimit an image acquisition chamber 15 in which the image acquisition device 5 is accommodated.

[0097] The bottom wall 13 may be solid or have ventilation openings therethrough, for example in the form of cylindrical holes and / or grooves. In one embodiment, the hollow support portion 7 may not have such a bottom wall.

[0098] At least a portion of the tubular portion 11 , or even the entire tubular portion as shown, preferably extends parallel to the longitudinal axis X, in order to facilitate fixing and handling of the hollow support portion.

[0099] The tubular portion 11 has at least one cross section transverse to the longitudinal axis X which is substantially elliptical. This shape of the hollow support portion facilitates gripping the support and also corresponds substantially to the shape of the contour of the access opening to the user's mouth, which is delimited by the lower lip and the upper lip when the user separates their lower and upper jaws.

[0100] The tubular portion 11 opens outwardly into a mouthpiece opening 17 at the other end longitudinally opposite to the bottom wall.

[0101] The shape of the profile 19 of the mouth piece opening is saddle-like. In other words, the profile 19 of the mouth piece opening 17 has two opposite convex portions 21 connected by opposite concave portions 23 when viewed from two perpendicular directions which are themselves orthogonal to the longitudinal direction.

[0102] The shape of the mouthpiece opening is preferably adapted to the general shape of the user's dental arch.

[0103] A mouthpiece 9 is attached to the hollow support portion 7. In the example shown, the mouthpiece is made of the same material as the hollow support portion. Other configurations may be envisaged, such as a mouthpiece made of a different material than the hollow support portion and / or mounted on the hollow support portion.

[0104] The oral piece 9 comprises two rigid interconnected parts 25a and 25b, preferably symmetrical to each other relative to the median plane, which respectively define an inner bearing surface 27a and an outer bearing surface 27b, for contacting and displacing the lower lip and / or upper lip of the user, respectively, in the operating position of the device, in which the oral piece is introduced into the user's mouth.

[0105] The mouthpiece 9 is a flange which projects radially outwards from the tubular portion 11 , ie, from the longitudinal end of the tubular portion opposite to the bottom wall 13 .

[0106] The rim is annular and shaped like a saddle. The profile of the flange is similar to the profile of the mouthpiece opening.

[0107] The image acquisition device 5 may be attached to the support 3. For example, Figure 2 and Figure 3 As shown, the support comprises a housing 28 defining a housing 29 of complementary shape to the image acquisition device 5 and in which the image acquisition device is housed.

[0108] The receptacle comprises a receptacle wall 31 , for example semi-cylindrical, extending transversely between the opposing inner surfaces of the tubular portion and longitudinally from the bottom wall of the hollow support portion.

[0109] The receptacle is integral with the hollow support portion. Alternatively, the receptacle may be attached to the hollow support portion.

[0110] The image acquisition device comprises a housing 33 and two optical assemblies 34, each of which comprises a camera 35 and an LED light 37, which are completely housed in the housing. The number of cameras and lights is non-limiting.

[0111] The image acquisition device 5 also comprises a USB type connection socket 39 arranged in a recess in the thickness portion of the bottom wall 13. Through the socket a data transmission cable can be connected to transmit the images acquired by the camera 35 through the mouthpiece opening 17 to the display device 3.

[0112] Figure 3 and Figure 4 A variant of the image acquisition device 3 as described in EP 3391810 A1 is shown, in which the mouthpiece 9 is removably mounted on a support 4, which may also be telescopic, and the image acquisition device 5 is a mobile phone 40 with a screen 42, which is removably mounted on the support and is not directly visible to the user when the mouthpiece is inserted into the user's mouth.

[0113] In the example shown, the display device 3 is a digital tablet 44 comprising a screen 46, a memory for storing digital data, and a processor for executing a computer program, in which memory a computer program for directing the acquisition of images using the image acquisition device 2 is loaded. However, other types of display devices 3 are also possible. For example, the display device is a personal computer, a mobile phone or an interconnected television, which is also called a "smart TV". In particular, the display device can be a mobile phone and the acquisition device is another mobile phone.

[0114] Images can be transferred between the image acquisition device and the display using a cable that connects one end to the Figure 2 The connection socket 39 on the image acquisition device or mobile phone shown, the other end is connected to the connection socket on the digital tablet. Alternatively, data, specifically images, can be transmitted between the image acquisition device and the display device through a wireless link such as WIFI.

[0115] Figure 5 shows how to use e.g. Figures 1 to 4 The image acquisition kit according to the present invention shown in FIG. 1 implements an example of the method according to the present invention.

[0116] To capture an image of the dental arch of the user 50 , the user holds the support 4 and introduces the mouthpiece into his mouth in order to curl his lips and expose his dental arch so that it is visible to the image capture device 5 through the mouthpiece opening.

[0117] The user can also issue a command to execute a computer program on the display device. For example, the execution of the program triggers the image acquisition device 5 to acquire an image and transmit the image to the acquisition device in real time via the connecting cable 52. The user can therefore directly view the image acquired by the image acquisition device 2, as shown by the arrow V on the screen 46. As shown in the figure, the method can be implemented simply and conveniently for the user. Once the image is acquired, the user can manipulate the support 4 to modify the position and orientation of the image acquisition device relative to his face to acquire a new image, and then directly view the new image on the screen 46 and evaluate the quality of the acquisition.

Claims

1. The image acquisition kit (1) comprises: Extraoral image acquisition device (2), the extraoral image acquisition device comprising ○Support member (4), o a mouthpiece (9) defining a mouthpiece opening (17) and carried by the support, o an image acquisition device (5) attached to the support and comprising a camera (35) for acquiring at least one image of a dental scene seen through the mouthpiece opening (17), and a display device (3), said display device comprising a screen (46) for displaying an image representing said scene acquired by said image acquisition means, The image acquisition device comprises an additional screen (42) and / or the support defining an image acquisition chamber (15), in which the image acquisition device is at least partially, preferably completely, housed.

2. The kit according to claim 1, the display device being selected from a mobile phone, a digital tablet, a desktop computer, in particular a portable computer, and a television, in particular a connected television.

3. The kit according to any one of claims 1 and 2, comprising a communication module for transmitting the image acquired by the image acquisition device (2) to the display device (3).

4. Kit according to the preceding claim, the communication module being a wireless communication module, in particular a radio communication module.

5. The kit according to claim 3, wherein the communication module comprises a data transmission cable (52), e.g. of USB type, for connecting the image acquisition device (2) to the display device, and the image acquisition device (3) and the display device each comprise a connection socket for inserting the data transmission cable.

6. A kit according to any one of the preceding claims, comprising a control module for triggering image acquisition.

7. A kit according to the preceding claim, the control module comprising a computer program including instructions for guiding the user to position the image acquisition device in at least one image capture position and a processor for executing the computer program.

8. Kit according to the preceding claim, said computer program comprising instructions for processing the acquired images in order to provide at least one item of information to the user.

9. The kit according to any of the preceding claims, the image acquisition device comprising several cameras (35), which are arranged in particular along different lines of sight and are each used to acquire a different view of the same dental scene.

10. A kit according to any one of the preceding claims, wherein the image acquisition device has a width of less than 40 cm 3 volume.

11. A kit according to any one of the preceding claims, the surface area covered by the mouthpiece opening being greater than 2 cm 2 .

12. A kit according to any one of the preceding claims, the support member comprising a longitudinally extending hollow support portion (11), the mouthpiece (9) extending the hollow support portion.

13. Kit according to the preceding claim, the mouthpiece (9) being integral with the hollow support portion or, in particular, being removably mounted on the hollow support portion (11).

14. The kit according to any of the preceding claims, the distance between the camera (35) and the mouthpiece (9) being less than 15 cm, preferably less than 7 cm, more preferably less than 6 cm, and most preferably greater than 2.5 cm.

15. Kit according to any of the preceding claims, the image acquisition device (5) not being embedded in the mobile phone and / or being different from the mobile phone.

16. The kit according to any one of claims 1 to 13, wherein the image acquisition device comprises an additional screen (42), in particular the image acquisition device is a mobile phone (40).

17. A method of acquiring an extraoral image using an image acquisition kit according to any one of the preceding claims, the method comprising a) grasping the support member (4) and positioning the mouthpiece (9) in the mouth of a user (50), b) acquiring at least one image of the user's lower dental arch and / or upper dental arch by means of the image acquisition device (5), and c) displaying the image on a display device (3) so that it is visible to the user (50).

Images