BE1029755B1 - JAW STRETCHING DEVICE AND USE OF SUCH DEVICE - Google Patents

Abstract

The invention relates to a device for stretching the muscles of the jaw, in particular the masseter muscle, comprising: a block comprising a resilient foam and having a first face and an opposite second face, the distance between the first and second face representing a block height; the block being compressible so that it can be inserted into the mouth of a user in the compressed state, and exert an opening force on the jaws of the user when the block tends to return to its uncompressed state; in which the height of the block, in the uncompressed state, is greater than the mouth opening of the user; in which the first face has a marking indicating the position of the teeth of the upper jaw; and wherein the block is substantially impermeable to saliva. The invention also relates to a use of such a device for stretching the jaw muscles, in particular the masseter muscle, as well as a method of relieving stress by stretching the jaw muscles of a user by means of such a device.

Description

JAW STRETCHING DEVICE AND USE OF SUCH

DEVICE

Technical area

The present invention generally relates to a device for calming the physical manifestations of stress and its use. More particularly, the invention relates to a jaw stretching device and the use of such a device for stretching the muscles of the jaws,

State of the art

Considered as the "may of the century", stress affects all social classes and is particularly prevalent in the world of work. Although sometimes considered a driving force by some, À can lead to serious problems when it occurs too often or when the individual fails to manage it. Among the physical manifestations of stress, mention may be made of muscle tension and/or overuse of certain muscles, for example tension of the muscles of the jaw. These tensions can be the cause of bruxism, or an aggravation of it, in people suffering from occasional or chronic stress. One of the

Causes of bruxism sst in sfiet an unusual contraction of the masseter muscles due to high level of stress, the masseler muscles no longer relaxing enough,

Today, bruxism is mainly found during consultations with a practitioner, for example a physiotherapist, using devices to stretch the jaw muscles.

For this purpose, for example, the device of patent EP 0439889 81 is known, comprising two dental gutters formed to adapt to the upper and lower teeth of a patient and mounted on a clamp. By pressing on the clamp, a practitioner, most often a physiotherapist will separate the upper and lower gutters from each other, thus causing the jaws to spread apart. The separation of the jaws is therefore the stretching of the corresponding muscles is done actively, by applying a force external to the device.

The manufacture and use of such a device requires the intervention of several practitioners, such as a doctor, a dentist and/or a dental technician in order to manufacture custom gutters. In addition, such a device cannot be used by a patient alone, but only in the presence of a physiotherapist, who can perceive neither the limit of the stretch nor the patient's pain when the device is actuated.

Alin to overcome this last drawback, alternative devices allowing passive stretching of the jaw muscles, The. without the patient or a practitioner activating a mechanism at the origin of the stretching, have been developed. For example, US 2002/16558 A1 discloses a device for stretching the muscles of the lower part of the face comprising a support and an expansion element. In use, the expansion element is rolled up on itself in a compact manner and introduced into the support. The support is then positioned between the upper and lower jaws of the patent. The restoring force of the expansion element expansion will reduce the compactness of the winding of the latter which exerts a force on the support which will be transmitted to the jaws and allow a separation thereof. Such a discositif however has certain drawbacks. Its positioning in the mouth is not easy, so it is difficult to exert force in an optimal way. Indeed, the patent can push it 29 too far into his mouth, which risks injuring him, or on the contrary not push it enough so that the device will not apply sufficient force to the jaws to allow their separation. , and therefore a stretching of the muscles #SS0CIÉS, or the device will risk coming out of the patient's mouth when the restoring force of the expansion element unrolls it, In addition, the rounded shape of the support prevents a distribution homogeneous pressure on the jaws, which can cause discomfort or even pain in the patient when using such a device Finally, such a device is a therapeutic device which cannot be used by a patient in absence of a practitioner, for example to relieve temporary stress.

These devices make it possible to treat bruxism once it has appeared. However, it would be useful to be able to relieve muscle tension due to stress before the appearance of medical complications and without the need to consult a practitioner for to do.

Invention Project

It is therefore an object of the present invention to provide a stress relieving jaw muscle stretching device that is easy to use and does not have the aforementioned disadvantages.

General description of the invention

According to a first aspect, the present invention relates to a device for stretching the muscles of the jaw, in particular the masseter muscle, comprising: a block comprising a resilient foam and having a first face and a second opposite face, the distance between the first if second face representing a height of the block; the block being compressible so that it can be inserted into a user's mouth in a compressed state, and exert an opening force on the user's jaws when the block tends to return to its uncompressed state in which the height of the block, in the uncompressed state, is greater than the mouth opening of the user; in which the first face has a marking indicating the posifion of the teeth of the upper jaw; and wherein the block is substantially impermeable to saliva,

According to a second aspect, the present invention relates to the use of the device as described above for stretching the muscles of the jaw, in particular the masseter muscle.

According to a third aspect, the present invention relates to a method of relieving stress by stretching the muscles of the jaw, by means of the device of the invention, in which a force is applied manually to the bios to compress it so as to insert in the mouth and position the incisors of the upper jaw on the marking of the first side, then the manual compression force is removed in order to let the block relax so that it exerts an opening force on the mächolres,

The term 'block' designates here a volume of resilient solid material, which can have any suitable shape, which has opposite faces on which the teeth of the upper and lower jaws are applied, respectively. In use the first face, which comprises the marking will typically be oriented towards the top and will therefore constitute an upper face; The second face will therefore be a lower face. The bioc includes a volume of resilient foam, which allows it to be compressed under the effect of an external force exerted by the user, and allows the block to return to its initial shape. uncompressed state, The. state of rest. The block consists mainly or entirely of foam. It can be a single volume or several combined / united volumes (eg glued), of the same material or of different materials (typically polymer foam). 16 Thus, the block can be considered as a elastically deformable block (residual deformation preferably less than 10%, more preferably less than 5% or even less than 2%),

One of the merits of the invention is to have identified that the use of a deformable block comprising a resilient foam and having a height greater than the mouth opening of a user allows passive stretching of the jaw muscles, without resulting pain for the user. Indeed, the inventor has discovered that the present device allows a passive stretching of the musciss of ja jaw, in particular of the masseters. Once the device is instaled in the mouth, no further action is required on the part of the user. The present device differs from many known systems in that it is not intended to be chewed by a diffuser.

Thus, one of the advantages of the device according to the invention is that it makes it possible to extend the muscles and thus relieve stress. It is compressed for the mouth, and the pushing force exerted by the foam of the deformable block is used. resilient (which therefore tends to regain its shape) on the denis to passively spread the jawbone.

In other words, when using the device, once it has been introduced into the mouth, the user no longer applies any force to it. The stretching of the muscles, and thus the relief of stress, is due to the resilient character of the block, WHICH in its compressed state will relax (ie. relax) to tend to return to its

Uncompressed state (or resting state), Since the block has a height, in the uncompressed state, greater than the mouth opening of the user, the relaxation of the bios exerts a force on the jaws of the user. user and allows stretching of the muscles,

Advantageously, the more the user relaxes (the more his muscles and in particular his masseters are relaxed), the better the relaxation of the block, therefore the greater the resulting stretch. On the contrary, when the user is too tense, the user will not relax his muscles enough to allow the compressible block to compress to its uncompressed state. In other words, a too tense user exerts on the device a force contrary to the force resulting from the relaxation of the bios compressible, and no stretching of his jaw muscles results.16 This minimizes the risk of injury when using this device.

Similarly, since no external force is required for the stretching of the muscles, whether applied by the user himself, by a practitioner or by another device connected to the device of the present invention, The device can be used according to the user's feelings, who can decide to take it out of their mouth and therefore stop stretching their muscles according to their feelings, in particular their pain. This also makes it possible to minimize the risk of injury .,

Another of the merits of the invention is that the present jaw muscle stretching device can be used by any user in the absence of a practitioner. In other words, this device can be used at home, on vacation or even in transport to relieve temporary stress, it is not limited to its use in the office of a practitioner such as a physiotherapist. Finally, such a device comprising no custom-made/moulded part to the teeth of the user, if it is easy and inexpensive to produce, According to embodiments, a height of the block between the first and second face, at the in the uncompressed state, is between 50 and 70 mm, preferably between 55 and 65 mm and in particular is 80 mm. According to the same or other embodiments, a width and/or a depth of the upper face is between 70 and 90 mm, preferably between 75 and 85 mm and in particular is SD mm.

The dimensions above correspond to the preferred dimensions of a device according to the invention intended to be used by an adult. According to other embodiments, in particular when the device according to the invention is intended to be used by a child, each of the dimensions of the block can be reduced. In particular, the height, the width and/or the depth of the block can be reduced, compared to the dimensions mentioned above, by 15 to 25 mm, preferably by 20 mm, In other words, depending on the alternative embodiments, a height of the block can be between 25 and 55 mm, preferably between 30 and 50 mm, more preferably between 35 and 45 mm, particularly preferably equal to 40 mm, and a width and/or a depth of the bioc can be between 45 and 78 mm, preferably between 50 and 70 mm, more preferably between 55 and 85 mm, particularly preferably equal to 60 mm.

The block can advantageously take the form of a rectangular parallelepiped, which is advantageous both in terms of its handling, its behavior during deformation, and its manufacture. Preferably, the block is a full volume, without cavities and /or without grooves or recesses in its side faces,

According to a particularly preferred embodiment, corresponding to a jaw muscle stretching device intended to be used by an adult, the block is a rectangular parallelepiped having a height between its first and second faces equal to 50 mm, and the first face is a square with a side of 80 mm (The depth and the width of the face are 80 mm each), Such dimensions are particularly suited to the typical morphology of the oral cavity of an adult, In particular, such a height of the block is greater than 29 the mouth opening (Le, the vertical opening of the mouth) typical of an adult, which is generally accepted to be approximately equal to 5 om. Moreover, such a width of the block of the device is! sufficiently small compared to the lateral opening of a conventional mouth of an average adult, and can therefore be easily inserted into the user's mouth while being sufficiently large compared to the dimensions of a jaw, in particular the width of the jawbone, in order to be able to support it on a surface suitable for the use of this device.

According to another particularly preferred embodiment, corresponding to a device for stretching the muscles of the jaw intended to be lifted by a child, the bioc is a rectangular parallelepiped having a height between its first and second faces equal to 40 mm, and the first face is a square with a side of 52 mm (The. depth and width of the face are 80 mm each). Such dimensions are particularly suited to the typical morphology of the oral cavity of a child. In addition, such a width of the block of the device is sufficiently small compared to the side opening of a conventional mouth of an average child, el can therefore be easily inserted into the mouth of the user while being sufficiently large by compared to the dimensions of a jaw, in particular the width of the jaw, Dour be able to support the latter on a surface suitable for the use of the present HSpOSItf.

In addition, a compact block of generally parallelepipedal shape has the advantage, compared to another geometry such as an hourglass shape, of allowing a better distribution of the forces on the teeth when the bioc relaxes 16 towards its non-compressed elaai From the compressed state, In particular, a lelie shape makes it possible to spare the canines, and allows the user greater relaxation and therefore better stretching of the muscles, in particular of the masseters.

According to the same or other embodiments, the marking of the first indigus face ja position for the inciaives of the upper jaw. The marking therefore provides the user with a clear indication to position his teeth, which helps to ensure that the forces resulting from the relaxation of the foam (during the relaxation / return to the uncompressed state) apply to the level of the incisors and not of the canines of the user. This allows a better distribution of the forces and a minimization of the constraints and the pain, and therefore an optimal efficiency 29 of the present device during its use.

According to certain variants, the first face marking comprises a frait positioned at a distance of between 25 and 35 mm from a front edge (Iourné towards the user) of the first face, preferably at 30 mm from the front edge. such position of the marking, the user will push the bioc of the present device sufficiently into his mouth to prevent it from coming out on its own during use, in particular when it resumes its original volume (The, that it returns to its non-compressed state) due to the relaxation (or relaxation) of the foam that it comprises. Such a position of the marking advantageously allows the introduction into the mouth of a larger volume of cube than in the absence thereof, the user being encouraged to introduce a larger volume, which allows a greater stretching of the jaw, however the Doc will not be depressed enough to cause discomfort to the user, avoiding the activation of the gag reflex

Alternatively or additionally, the marking should comprise, on the first or the second face, a line extending along a line intersecting two adjacent sides of the face at two predetermined places. For example, the line extends between a first end located at approximately 20mm from the lower left corner and a second end located approximately 20mm from the upper right corner, when viewed from the front edge of the faceplate. This marking allows the introduction into the mouth of a smaller volume of the Dios, and thus allows a gentler stretching of the jaw, which is particularly advantageous when Vulisaleur suffers from significant stress and/or when his muscles are strongly contracted. , When this marking is provided on the second face, it will be oriented upwards during use; the second side will then be an upper side,

In general, the first face comprises a marking indicating the position of the teeth of the upper jaw and the second face may be without marking, or also include a marking indicating the position of the teeth of the upper jaw, this marking possibly being the same as that of the first face or different (i.e. have other marks for the teeth / incisors for another way of filling the devices

According to the same or other embodiments, in particular according to the preferred embodiment in which the block is a parallelepiped, the block comprises a plurality of side faces and two opposite side faces each have a marking indicating the position of a finger, The markings on the two side faces are positioned opposite each other. Advantageously, the marking of the listeral faces is carried out by a point positioned at a distance between 25 and 35 mm from an upper edge common to the side face and to the upper face, in particular at 30 mm from the upper edge, and at a distance of between 15 and 25 mm from a side edge common to the side face and an adjacent side face, in particular at 20 mm from the side edges, such markings on the side faces advantageously allow the user to know where to position his fingers to compress the block (Le, bring the block from an uncompressed state to a compressed state) before inserting it into his mouth. This also allows the bioc to be bent in order to obtain a shape that is easier to insert into the mouth of the user, in particular applying pressure to the side faces of the block helps to prevent the enlargement of the block which could result from the application of pressure on the g

BE2021/5721 upper and lower faces, enlargement which would complicate or even prevent the insertion of the device, Thus, by positioning his fingers on the markings of the side faces when he compresses the bice of this device, the user facilitates its subsequent insertion,

According to certain embodiments, the second face has a marking indicating the position of the teeth. According to a first variant, such a marking of the second face is identical to the marking of the first face and is positioned opposite the marking of the first face. Thus, a user does not have to find out which is the upper face, the first and second faces being identical, which facilitates the use of the present device. Moreover, although the positioning of the lower jaw is preferably conditioned by the comfort of the patient and not by an imperative of good use of this device, the marking of the lower face makes it possible to ensure an optimal placement of the lower jaw on the device, and therefore a better distribution of the forces during the stretching of the muscles , in particular the masseters, which increases the effectiveness of the stretching device and its comfort of use,

According to a second variant, the markings of the first and second faces are different. The marking of the first face may be a trai extending parallel to an edge of the face, 30 mm from the latter, while the marking of

Ia second face may be a line extending diagonally from the second face between a first end located 20 mm from the lower left corner and a second end located 20 mm from the upper right corner, seen from the front edge of the face, according to this variant, H is particularly advantageous for the user to consider only the marking of one of the faces (first or second face,

which becomes the upper face when in use) to position the teeth of its upper jaw. Such a device having different markings on its first el second faces has the advantage of greater versatility and a possibility of longer use. Indeed, a very stressed user having very contracted muscles can first of all use is block in ulllisani ia second face as upper face to place his teeth, which allows a soft stretching of the muscles. Once the stress decreases and the muscles begin to relax, the user can then turn the block of the present device over and use the first side as the upper side to position their teeth, thereby allowing greater stretching of their muscles. and increasing the reduction of his stress, such a device thus advantageously allows the user to relieve his stress, whatever the level of the latter, without risk of injury.

According to the same or other embodiments, the foam included in the block is a resilient deformable foam, so that it can easily be compressed by the user when using the device, while having a relaxation force. sufficient to act on the jaws of the user when the device is inserted into the mouth of the user and thus stretch the muscles of the jaw, in particular the masseters, Advantageously, the foam included in the block has a gross density of between 30 and 80 kam), preferably between 35 and 55 kg), particularly preferably equal to 43 kg 'stfou the foam has an indentafion hardness at 25% according to the standard

ISO 2439-2008 between 100 and 130 N, preferably equal to 115 N and or the foam has a residual deformation after compression of at most 5%, preferably at most 2%.

According to certain embodiments, the compressible block of the present device further comprises an impermeable coating completely covering the foam, the marking being made on the coating. Advantageously, the coating makes it possible to prevent the absorption of saliva by the bios foam, st 29 facilitates its maintenance.

According to certain variants, the coating entirely covering the foam of the compressible block of the present device is non-combustible and/or non-flammable and/or resistant to physical sierilization (for example to sierilization in an autoclave at 134° C.) and/or resistant to chemical deniamination (for example to the use of solvents based on quaternary ammonium alcohol, chiors, chioramine or peroxide). According to particularly preferred embodiments, the coating exhibits all of these characteristics. | is therefore both non-combustible, non-flammable, resistant to physical seriization and resistant to chemical decontamination, Such a coating makes it possible to protect the foam which it covers, in particular from fire, thus increasing the safety of the present device, From moreover, a coating resistant to physical sterilization and/or chemical decontamination makes it possible to carry out a meticulous nelloyage of the latter between two uses, in particular disinfection, A device having such a coating can advantageously be used by different users and disinfected between two successive users, so as to respect the health standards in force.

Strike description of the figures

Other particularities and characteristics of the invention will emerge from the detailed description of at least one advantageous embodiment presented below, by way of illustration, with reference to the appended drawings. These show:

Fig.1 a perspective view of the device for stretching the jaw muscles in the uncompressed state

Fig & a perspective view of the device of Fig,” in the compressed state:

Fig 3 a perspective view of the device of Fig, 1 in an intermediate state; And

Fig.4 two views (a and b) of the second face of the device according to two embodiments.

Detailed description using figures

Figures 1 to 3 show an embodiment of the jaw muscle stretching device 10 according to the invention. In use, the device 10 changes from an uncompressed state (or at rest - Fig. compressed state (Fig.2} before returning to the non-compressed state, via an Intermediate compression strut (Fig. 3}.

The jaw muscle stretching device 10, or hereinafter simply device, comprises a compressed block 12 having a first face 14.1 and a second face 14.2 placed on the first face 141. According to the variant shown, the block 12 has a general shape of rectangular parallelepiped block and the upper faces 14.1 st lower 14.2 each extend in a plane AY and are parallel to each other, separated by a height H along an axis £ The block 12 comprises a front face 14.3 facing the user, a rear face 14.4 coposée, and two opposite side faces 14.5 connecting the front and rear faces.

In the present embodiment (Fig 1), the faces 14.1 and 14.2 are identical, square in shape and have a width L along the axis A equal to their depth P along the axis Y. For a device 10 intended to be used by an adult, the width L and the depth P of the upper 14.1 and lower 14.2 faces (and therefore the width and the depth of the block 12) are typically equal to 80 mm, but may have different dimensions, for example if present The jaw muscle stretching device 10 is intended for use by a child.

Still according to this embodiment, the height H of the bioc along the Z axis is iypiquement equal to 80 mm This height can be adapted according to the mouth opening of the end user,

The block 12 comprises a polymeric foam, which constitutes the heart of the compressible Doc, as well as a saliva impermeable coating 15 completely covering the foam, so that the saliva of a user, when using the present device, is not absorbed by the foam. The foam represents most of the volume of the block 12, in particular with respect to the dimensions indicated below, the coating typically having a thickness of the order of 0.5 to 1 or 1.5 mm.

Any type of compressible and highly resilient foam can be used to form the core of the block of the jaw muscle stretching device, such as, for example, foams with an indentation hardness of 25% according to ISO 2439.2008 of between 100 and 130 N and a residual deformation of less than 5%,

Any type of saliva impermeable coating may be employed as the coating in the present device. Preferably. so that the device can be used by several people in compliance with the health rules in force, the coating is also resistant to sierilization and chemical decontamination so that it can be thoroughly cleaned between two uses. The coating may also be non-flammable if non-combustible.

Block 12 of device 10 further comprises a marking 18 on its first face 14.1. According to the variant represented in FIG. |, Ie marking 18 is made on the coating 16 so as to be visible to the user. The marking 18 ssl a line indicating the position of the jawbone, in particular of the incisors, located 30 mm from an edge 20 (The. of an edge) before the upper face 14.1 and extending paratiéiement # that- this. In other words, the marking 18 is a line along the X axis positioned here at a quarter of the depth of the upper face along the Ÿ axis.

The marking 18 can be made in any appropriate way, for example by applying a paint to the location of the marking, by changing the texture or color of the coating Is along the marking, or even the marking can be sewn onto the coating, According to the present variant, the marking 18 is a line sewn on the coating 18, Such a marking 18 has the advantage of being visual and tactile, so that the user knows where to position his upper jaw even when he introduced the device 10 into his mouth and he no longer sees, or with difficulty, the marking.

According to certain variants, the second face 142 of the device may also have a marking 40 to indicate the position of the teeth. The marking 40 of the second face may be identical to the marking 18 of the first face 14.1 (Fig <a) and be positioned opposite it According to an alternative and preferred embodiment, the marking 40 of the second face 14.2 can be a line extending diagonally from the second face between a first end 42 located 20 mm from the lower left corner st a second die end located 20 mm from the upper right corner (Fig.4b) when the second face is seen from its front edge.

The markings indicate the position of the teeth (parallel lines & a front edge of the first and/or second face(s) and/or diagonal marking of the second face) 29 are made on the square faces of the block of the device having a generally parallelepipedic shape.

The bioc 12 of the device 10 further comprises markings 22 on the two side faces 145, the two faces being opposite to each other (Le. not adjacent).

These markings 22 are cositonnés facing each other on the side faces 14.5, According to the variant shown, the marking 22 of a side face 14.5 is positioned 30 mm from an edge 24 common to the first face 14.1 , which, according to the present variant, corresponds to placing the marouage 22 at mid-height of the side face 14.5, The marking 22 is also positioned 20 mm from an edge 26 common to the front face 14.3.

The markings 22 of the side faces 14.5 are generally dots of any geometric shape, for example round, star, or cross. These markings can be made in any appropriate way. For example, the markings 22 can be painted or sewn on the coating. A marking made in the form of a circle, cross or star sewn on the covering presents Vavaniage with being both tactile and visual, so that this device can be used by everyone! ie world, including blind or visually impaired people.

The markings 22 of the side faces 14.5 indicate to the user where to position his fingers when using the present device 10. Indeed, according to one embodiment, the user needing to relieve using the present device a transient or chronic stress, which manifests itself in myscular tension in the jaw, can proceed as follows.

The user grasps block 12 of device 40, which is in an uncompressed state 12 (FIG. 1), with both hands and positions his middle fingers on the markings 22 of the side faces 14.5 (one middle finger per marking), his thumbs on the second face 14.2 (which is the lower face during the present use of the device) and its indexes on the first face 14.1 (which is the upper face),

The user then applies a force using each of his fingers to the block of the device. In particular, he exerts a compression force on the side faces 14.5 in the direction of the arrows 28, Compression on each of the upper and lower faces 14.1 and 14.2 (direction of the arrows 30, 32).

Block 12 of device 10 is then in a compressed state (Fig.2},

Then the user inserts the device in his mouth between his lower and upper jaws in the direction of the arrow 34 and positions his upper jaw, in particular his incisors, on the marking 18 of the first face 14.1, which here is the upper side.

Subsequently, the user, while ensuring contact between the upper and lower ncisors with the upper 14.1 and lower 14.2 faces, withdraws his fingers and thus tries to apply a manual compression force on the compressible block 12 of the device 10 The foam included in block 12 being resilient, it relaxes to tend to return to its initial volume and bring block 12 back to its uncompressed state. utlisaileur in the direction of arrows 36 and 38, respectively (Fig.3), which allows a separation of the jaws and therefore a stretching of the muscles, in particular of the masseters. The more relaxed the user is, the lower the resistance he will oppose to the force resulting from the relaxation of the foam. The foam will relax better and the stretching will be greater, as will the stress relief of the user. 'user.

Claims (13)

Claims 1. Device for stretching the muscles of the jaw, in particular the masseter muscle, comprising a bioc (12) comprising a resilient foam and having a first face (14.1) and a second opposite face (14.2), the distance between the first and second face representing a height (9) of the bios; ie block being compressible so as to be able to be inserted into the mouth of a user in the compressed state, el exerting an opening force on the jaws of the user torague the bioc tends to resume its uncompressed Stat: in which the height of the bicc, in the uncompressed state, is greater than the mouth opening of the user in legus! the first face (14,1) has a marking (15) indicating the position of the denis of the upper jaw | and wherein the block is substantially impermeable to saliva, 2. Device according to claim 1, in which the height of the block between the first and second faces, in the uncompressed state, is between 50 and 70 mm, preferably between 55 and 65 mm, in particular 60 mm, 3, Device according to claim 1 or 2, in which a width and/or a depth of the first face is between 70 and 90 mm, preferably between 75 and 85 mm, in particular 82 mm, To. Device according to Claim 1, in which the height of the bioc between the first and second faces, in the uncompressed state, is between 25 and 55 mm, preferably between 30 and 50 mm, more preferably between 35 and 45 mm. mm, in particular SO mm. 5, Device according to claim 1 or 4, in which a width and/or a depth of the first face is between 45 and 75 mm, preferably between 50 and 70 mm, more preferably between 55 and 85 mm, in particular of SO mm. & Device according to any one of the preceding claims, in which an impermeable coating completely covers the foam, the marking being made on the coating, 7. Device according to any one of the preceding claims, in which the marking (18) of the first face (14.1) indicates the position of the incisors of the upper jaw, 8. Device according to any one of the preceding claims, in which the marking of the first face comprises a line positioned at a distance of between 25 and 35 mm from a front edge of the first face, preferably 30 mm from the edge. Before. 3. Device according to any one of claims 1 to 8, in which the first face or the second face comprises a marking made by a line extending along a line intersecting two adjacent sides of the face, in particular between a first extremity located approximately 20mm from the lower left corner and a second end located approximately 20mm from the upper right corner, when viewed from the front edge of the face, 10 A device according to any preceding claim, wherein the block comprises two side faces (14.5) opposite connecting the first and second faces, yes each have a marking (22) indicating the position of a finger, the markings of the two side faces being preferably positioned opposite one another, *1. Device according to the preceding claim, in which the marking of the lateral faces is a point positioned at a distance of between 25 and 35 mm from a first edge common to the first face, in particular at 28 to 30 mm from the first edge, st at a distance of between 15 and 25 mm from a common side edge to the side face and a front face of the weather strip, in particular 20 mm from the side edge, 12. Device according to any one of the preceding claims, in which the foam has a gross density of between 30 and 60 ka', preferably between 35 and 55 kg/m, particularly preferably equal to 43 kalm* and/or in which The foam has an indentation hardness at 25% according to the ISO 2439:2008 standard of between 100 and 130 N, preferably equal to 115 N el/or in which the foam has a residual deformation after compression of at most 5%, preferably at most 2%. 13. Device according to any one of the preceding claims, when dependent on claim 6, in which the coating is non-combustible and/or non-flammable and/or resistant to physical sterilization and/or resistant to chemical decontamination, preferably the coating is not combustible, non-flammable, resistant to physical sterilization and resistant to chemical decontamination, 14 Use of the device according to any one of the preceding claims to stretch the jaw muscles, in particular the masseter muscle, Method of relieving stress by stretching jaw muscles of a user by means of the device according to any one of Claims 1 to 13, in which a force is applied manually to the block to compress it so as to insert it in the mouth and position the incisors of the upper jaw on the marking of the first face, then the manual compression force is removed in order to let the Dioc relax so that it exerts an opening force on the jaws,