CN221243068U - Dental instrument for depressing posterior teeth - Google Patents

Abstract

The utility model discloses a dental instrument for depressing posterior teeth, comprising a shell-shaped body and a jaw pad for depressing posterior teeth; the shell-shaped body is a shell conforming to the shape of the dentition of a human body and comprises a plurality of cavities which are arranged into a U shape and used for accommodating a plurality of teeth; the jaw pad comprises a supporting part and an occlusion layer, wherein the supporting part is arranged on the occlusion surface of at least part of teeth in the rear tooth area of the shell-shaped body and protrudes towards the jaw direction, and the occlusion layer is arranged on the surface of the supporting part at least opposite to the occlusion surface of the jaw; the material elasticity of the supporting part is smaller than that of the shell-shaped body, and the material elasticity of the engagement layer is larger than that of the supporting part. According to the utility model, the jaw pad is designed to be formed by the support part with smaller elasticity and the occlusion layer with larger elasticity, so that the jaw pad has rigidity and flexibility, can meet the rigidity requirement of the low back teeth, is beneficial to the low back teeth, and can improve the comfort level and stability of patients during occlusion.

Description

Dental instrument for depressing posterior teeth

Technical Field

Embodiments of the present application relate to the field of medical devices, and more particularly to the field of orthodontic appliances, and more particularly to a dental device for depressing posterior teeth.

Background

Anterior mandibular opening refers to the fact that when a patient bites, the anterior maxillary teeth are not in occlusal contact with the anterior mandibular teeth in the vertical direction, and is mainly characterized in that one or more posterior teeth in the oral cavity are elongated too long, and when the posterior teeth bite, a fulcrum is formed, so that the anterior teeth cannot bite. There are many hazards of anterior mandibular opening, such as inability of the anterior teeth to cut food, affecting patient breathing, swallowing, etc. When treating open jaw patients, it is often necessary to depress the posterior teeth. Currently, with the continuous development of the bracket-free invisible technology, in the field of bracket-free invisible correction, a jaw pad is generally arranged on the upper and/or lower jaw posterior teeth area of an invisible appliance so as to depress the posterior teeth.

Because the jaw pad is subjected to the action of the occlusion force of the upper and lower teeth and jaws for a long time in the continuous occlusion correction process of the upper and lower teeth and jaws, the jaw pad needs to have rigidity which is not easy to collapse or deform in the occlusion process, and the higher the rigidity is, the better the effect of depressing the rear teeth is. However, in the prior art, the jaw pad arranged on the bracket-free invisible appliance is of a cavity structure formed integrally with the bracket-free invisible appliance body, the jaw pad and the bracket-free invisible appliance body are both obtained by the same piece of membrane through a hot-press membrane forming process, and the material of the jaw pad is consistent with that of the bracket-free invisible appliance body, at the moment, in order to obtain a good effect of depressing the posterior teeth, the rigidity of the jaw pad is required to be larger, the rigidity of the manufactured bracket-free invisible appliance body is also larger, the effect of depressing the posterior teeth is good, but the wearing comfort of a patient is reduced, the occlusion stability is poor, and the correcting effect and experience are poor; on the contrary, if the wearing comfort of the bracket-free invisible appliance is considered, the diaphragm with smaller material rigidity is selected for processing, so that the rigidity of the jaw pad formed by manufacturing is also smaller, and the wearing comfort of a patient is improved, but the effect of depressing the back teeth is poor.

Accordingly, there is a need to provide a dental appliance that solves the above mentioned technical problems.

Disclosure of utility model

The technical problem solved by the utility model is to overcome the defects in the prior art, and provide the dental instrument for depressing the posterior teeth, which not only can meet the rigidity requirement of depressing the posterior teeth, but also can improve the occlusal comfort and the occlusal stability of patients.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

A dental instrument for depressing posterior teeth comprising a shell-like body and a jaw pad for depressing posterior teeth; the shell-shaped body is a shell conforming to the shape of the dentition of a human body and comprises a plurality of cavities which are arranged into a U shape and used for accommodating a plurality of teeth; the jaw pad comprises a supporting part and an occlusion layer, wherein the supporting part is arranged on the occlusion surface of at least part of teeth in the rear tooth area of the shell-shaped body and is convexly arranged towards the jaw direction, and the occlusion layer is arranged on the surface of the supporting part at least opposite to the occlusion surface of the jaw; the material elasticity of the supporting part is smaller than that of the shell-shaped body, and the material elasticity of the engagement layer is larger than that of the supporting part. Compared with the prior art, the dental instrument for depressing the posterior teeth forms a jaw pad with rigidity and flexibility by designing the jaw pad to be composed of the support part with smaller elasticity and the occlusal layer with larger elasticity; the rigidity of the support body is larger than that of the shell-shaped body, so that the support body can meet the rigidity requirement for the low back teeth, the low back teeth are facilitated, the shell-shaped body is balanced in the process of ensuring the correction requirement and the wearing comfort level, and the rigidity of the support body is not required to be consistent; in addition, through set up the great interlock layer of elasticity on the surface that the supporting part is opposite with the jaw interlock face, both can promote the comfort level when patient's is stumbled, can utilize softer interlock layer to increase the stability when jaw pad and the jaw interlock contact again.

Preferably, the supporting part is fixed on the rear tooth area of the shell-shaped body in a bonding, welding, clamping or riveting mode, or the supporting part is directly manufactured and formed on the shell-shaped body through an additive process.

Preferably, the support part is a hollow bubble structure protruding towards the jaw direction. By the design of the cavitation structure, the overall weight of the dental instrument for depressing the posterior teeth can be reduced, the wearing is more comfortable, and the raw materials can be saved.

Preferably, the support part and the shell-shaped body are separately arranged, the support part comprises a mounting end connected with the shell-shaped body and a biting end opposite to the opposite teeth, the shape of the mounting end is matched with that of the mounting surface on the shell-shaped body, and the biting layer at least covers the biting end. The shape of the mounting end is designed to be matched with the shape of the mounting surface of the shell-shaped body, so that the support body is more stably mounted.

Preferably, the support is formed by an additive process.

Preferably, the shape of the side of the occlusal layer facing the occlusal surface of the opposite jaw matches the shape of the occlusal surface at the occlusal position of the opposite jaw. By such a design, the geometry of the surface of the jaw pad facing the occlusal surface of the opposite jaw can be substantially matched to the geometry of the corresponding region of the opposite jaw (tooth or shell-like body), so that upon occlusion, the surfaces of the two can be substantially matched.

Preferably, the shape of the occlusal layer facing to the occlusal surface of the opposite jaw is in a plane shape or an arc shape.

Preferably, the occlusion layer is formed on at least a surface of the support portion opposite to the occlusal surface of the opposite jaw by a hot press film process, a coating process, an additive process, or an adhesive manner.

Preferably, the elastic modulus of the material of the support portion ranges from: 800MPa or more and 3000MPa or less.

Preferably, the elastic modulus of the material of the occlusion layer ranges from: more than or equal to 5MPa and less than 800MPa. Preferably, the thickness of the occlusion layer ranges from: 0.5mm or more and 2.0mm or less.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a schematic view of a dental apparatus for depressing posterior teeth according to the present utility model;

FIGS. 2 and 3 are schematic cross-sectional views of the dental instrument of FIG. 1 at A-A for depressing the posterior teeth;

FIG. 4 is a schematic view of the structure of the shell-shaped body according to the present utility model;

FIG. 5 is a schematic view of the structure of the support part according to the present utility model;

FIGS. 6 to 8 are schematic cross-sectional views of the support portion at B-B in FIG. 5;

Fig. 9 is a schematic cross-sectional view of a dental instrument for depressing posterior teeth in another embodiment of the utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the following detailed description of the embodiments of the present utility model will be given with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present utility model. The claimed utility model may be practiced without these specific details and with various changes and modifications based on the following embodiments. The following examples are given for convenience of description and should not be construed as limiting the practice of the utility model in any way.

The directional terms "upper", "lower", "left", "right" and the like as used herein with respect to the drawings are not intended to be limiting in any way. The term "coupled" as used herein is to be interpreted broadly, and unless specifically stated or limited otherwise, as being either permanently or detachably coupled, or as being integrally formed therewith, either directly or indirectly via an intermediary.

The "posterior tooth zone" referred to in the various embodiments of the present utility model is defined according to classification of teeth including premolars and molar, shown as teeth of 4-8 in FDI notation, and teeth of 1-3 in FDI notation, published by the university of Beijing medical press, 2 nd edition, pages 36-38. The teeth of the anterior teeth area include central incisors, lateral incisors, and cuspids.

As known from the background art, in the current field of the bracket-free invisible appliance, the jaw pad is generally of a cavity structure integrally formed with the bracket-free invisible appliance body, the jaw pad and the bracket-free invisible appliance body are both obtained by the same piece of membrane through a hot-press membrane forming process, and the jaw pad is made of the same material as the bracket-free invisible appliance body; if the rigidity of the jaw pad and the bracket-free invisible appliance body is smaller, the wearing comfort of a patient is improved, but the effect of depressing the rear teeth is poor. Moreover, if a jaw pad with high rigidity is provided on the jaw surface in the posterior tooth area of the shell-shaped body, the physiological function of the oral cavity is negatively affected after the wearing, and the stiff jaw pad also causes a reduction in the desire of the patient to apply force to bite, and the posterior tooth depression cannot be realized in the state of not applying force.

Based on this, referring to fig. 1 to 3, the present utility model provides a dental appliance 100 for depressing posterior teeth, comprising a shell-like body 1 and a jaw pad 2 for depressing posterior teeth; the shell-shaped body 1 is a shell conforming to the shape of the dentition of a human body and comprises a plurality of cavities which are arranged into a U shape and used for accommodating a plurality of teeth; the jaw pad 2 comprises a supporting part 21 and an occlusion layer 22, wherein the supporting part 21 is arranged on the occlusal surface of at least part of teeth in the back teeth area of the shell-shaped body 1, namely, part of teeth in the 4-7 teeth in the back teeth area, and is convexly arranged towards the opposite jaw direction, and the occlusion layer 22 is arranged on the surface of the supporting part 21 at least opposite to the occlusal surface of the opposite jaw, namely, the occlusion layer 22 can only cover the surface of the supporting part 21 opposite to the occlusal surface of the opposite jaw; the bite layer 22 may cover the entire outer surface of the support portion 21; in the present utility model, the contrate may be a patient's contrate teeth; shell-like dental appliances that the patient wears over the teeth of the jaw; that is, the dental appliance 100 for depressing the posterior teeth of the present utility model may be in direct contact with the patient's teeth of the jaw or may be in biting contact with a shell dental appliance worn by the patient on the teeth of the jaw. Wherein the material elasticity of the supporting portion 21 is smaller than the material elasticity of the shell-like body 1, and the material elasticity of the engaging layer 22 is larger than the material elasticity of the supporting portion 21. That is, the rigidity of the supporting portion 21 is greater than the rigidity of the shell-shaped body 1 so as to satisfy the functional requirement of depressing the posterior teeth, the rigidity of the occlusal layer 22 on the supporting portion 21 is less than the rigidity of the supporting portion 21, and the occlusal layer is softer, so that the comfort level of a patient can be improved when the occlusal layer is occluded. In comparison to the prior art, the dental appliance 100 for depressing the posterior teeth of the present utility model forms a jaw pad 2 having both rigidity and flexibility by designing the jaw pad 2 to be composed of a less elastic support 21 and a more elastic bite layer 22; wherein, the rigidity of the supporting part 21 is larger than that of the shell-shaped body 1, so that the supporting part 21 can meet the rigidity requirement for depressing the posterior teeth, which is beneficial to depressing the posterior teeth, while the shell-shaped body 1 can balance in ensuring the correction requirement and the wearing comfort, and the material with proper material elasticity can be selected without keeping consistent with the material of the supporting part 21; in addition, by providing the bite layer 22 having a large elasticity on the surface of the support portion 21 opposite to the occlusal surface of the opposite jaw, not only the comfort level at the time of biting by the patient can be improved, but also the stability at the time of biting contact between the jaw pad 2 and the opposite jaw can be increased by using the soft bite layer 22. The utility model, by providing a softer bite layer 22, enables a more conforming bite to be made when biting the jaw (tooth or shell dental appliance), so that after a certain period of bite training, the patient's adaptability to the dental appliance with the jaw pad 2 can be increased, and finally the back force provided to the back teeth by the jaw pad 2 can be facilitated, causing the back teeth to be depressed.

In some embodiments, referring to fig. 4 to 8, in the manufacturing process, the shell-shaped body 1 and the supporting portion 21 may be manufactured separately, the material of the shell-shaped body 1 meeting the correction requirement may be selected according to the correction requirement in the correction period, and the material meeting the requirement of the low back teeth may be selected to independently manufacture the supporting portion 21, and then the supporting portion 21 may be fixed at the back teeth area of the shell-shaped body 1 by bonding, welding, clamping or riveting. Specifically, when the support portion 21 is provided separately from the shell-like body 1, the support portion 21 includes a mounting end 211 connected to the shell-like body 1, and when the support portion 21 is mounted, the support portion 21 can be fixedly mounted at the rear tooth area position of the shell-like body 1 through the mounting end 211. The support 21 further includes a bite end 212 opposite the counter jaw, it being understood that the bite end 212 refers to the end opposite the counter jaw teeth when the shell-like dental appliance is not worn by the counter jaw; when the shell dental appliance is worn against the jaw, the bite end 212 refers to the end opposite the shell dental appliance corresponding to the jaw. The bite layer 22 of the present application is secured to the bite end 212 to form the bite block 2 of the present application.

In other embodiments, as the additive process (such as 3D printing, photo-curing, deposition, etc.) is mature in the dental field, the shell-shaped body 1 may be directly manufactured by additive manufacturing using raw materials with rigidity meeting the needs of correction, and the support portion 21 may be directly manufactured on the shell-shaped body 1 by the additive process using raw materials with rigidity meeting the needs of low back teeth.

In some embodiments, the support portion 21 may be a cavitation structure protruding toward the jaw direction. The design of the cavitation structure reduces the overall weight of the dental instrument 100 for depressing the posterior teeth of the present application, reduces the load on the patient, is more comfortable for the patient, and saves manufacturing materials. The supporting portion 21 of the hollow structure may be integrally formed with the shell-shaped body 1 through a hot press film process or an additive process. The support portion 21 may be separately manufactured and then fixed to the rear tooth area of the shell-like body 1 by bonding, welding, fastening or caulking. For example, as shown in fig. 7 and 8, the support portion 21 may be made separately, specifically, as shown in fig. 7, the support portion 21 may be an open cavity structure with an opening at the mounting end 211, so as to further reduce the material consumption; more preferably, as shown in fig. 8, the supporting portion 21 may be a closed hollow structure with a hollow interior, so that the contact area between the mounting end 211 of the supporting portion 21 and the shell-shaped body 1 can be increased, and the supporting portion 21 is fixed to the rear tooth area of the shell-shaped body 1 through the mounting end 211, thereby being more stable and firm.

In some embodiments, the mounting end 211 may be planar in shape (as shown in fig. 6) to facilitate manufacturing. In other embodiments, the shape of the mounting end 211 may be designed to be a geometric shape matching the shape of the mounting surface 11 on the shell-shaped body 1, so that the contact area between the mounting end 211 and the mounting surface 11 on the shell-shaped body 1 can be increased, and the shape of the mounting end 211 matches the shape of the mounting surface 11 on the shell-shaped body 1, which is more beneficial for fixing and is more stable and firm after mounting. While the shape of the bite end 212 may be designed to be planar (as shown in fig. 6); the geometry may also be designed to substantially match the shape of the occlusal surface at the site of the jaw bite (as shown in fig. 8) so that the secure connection of the occlusal end 212 and the occlusal layer 22 is more snuggly secured.

In some embodiments, the bite layer 22 covers at least the bite end 212. For example, the bite layer 22 may cover only the bite end 212 (as shown in fig. 2). In other embodiments, the occlusal layer 22 may also cover the shell-like body 1 and the entire occlusal surface of the supporting portion 21 facing the jaw (as shown in fig. 3), and promote the occlusal comfort of the patient as a whole.

In some embodiments, the shape of the occlusal surface facing side of the occlusal layer 22 may be gentle, that is, the difference between the highest point and the lowest point of the occlusal layer 22 protruding toward the jaw and the outer surface of the shell-shaped body 1 covered by the occlusal layer 22 is small or the difference between the heights is 0, for example, may be approximately planar as shown in fig. 2 and 3, or may be arc-shaped as shown in fig. 9; in this embodiment, the cambered surface shape refers to a cambered surface shape that meets the geometry of the occlusal surface of the opposite jaw, for example, in the occlusion process, generally, the cusp of the back teeth of the opposite jaw is highest in height in the back teeth to be depressed, the protruding height of the occlusal layer 22 at the position corresponding to the cusp is lowest, the protruding height of the back teeth of the opposite jaw is lowest in height in the back teeth to be depressed, the protruding height of the occlusal layer 22 at the position corresponding to the alveolus is highest, that is, the shape of the occlusal layer 22 facing the occlusal surface of the opposite jaw is designed to meet the geometry trend of the occlusal surface of the opposite jaw, the occlusal layer 22 contacts with the occlusal surface of the opposite jaw of the patient as much as possible, the occlusal contact surface is increased, the comfort of the patient is higher, and the effect of the back teeth is also better; on the contrary, when the shape of the occlusal layer 22 facing to the occlusal surface of the opposite jaw is designed against the geometric trend of the occlusal surface of the opposite jaw, the occlusal layer 22 and the occlusal surface of the opposite jaw are in point contact, so that the comfort of the patient is not high, and the effect of depressing the back teeth is poor.

In other embodiments, it is preferred that the shape of the side of the occlusal layer 22 facing the occlusal surface of the opposing jaw be designed to a geometry that substantially matches the shape of the occlusal surface at the occlusal site of the opposing jaw, such a design being more conducive to the degree of conforming of the occlusal layer 22 to the occlusal contact of the opposing jaw, and making the patient more comfortable while biting. Of course, when the bite layer 22 is soft enough, the patient is comfortable with the bite, and when the upper and lower jaws are in biting contact, the soft enough bite layer 22 is capable of adapting to the geometry of the jaw. Moreover, when the occlusal layer 22 is soft enough, the force applied to the whole jaw pad 2 can be adjusted in a dispersing way through the occlusal layer 22, so that the even stress in the process of depressing the posterior teeth is more facilitated, and the effect of depressing the posterior teeth is better realized.

In some embodiments, the occlusion layer 22 may be directly hot-pressed and formed on the surface of the support portion 21 opposite to the occlusal surface of the opposite jaw when the shell-shaped body 1 is processed by a hot-pressing film process; it is also possible to apply a safe coating layer, such as an edible gel, directly on the surface of the support 21 opposite the occlusal surface of the jaw using a coating process; or may be formed using an additive manufacturing process using a material having a material elasticity greater than that of the supporting portion 21. The occlusion layer 22 formed by separate processing may be adhesively bonded to the surface of the support 21 opposite the occlusal surface of the opposing jaw. May be selected as appropriate to facilitate the patient or clinician, increasing the applicability of the dental appliance 100 of the present application for depressing posterior teeth.

In the application, the elasticity of the material selected for the supporting part 21 is smaller and the rigidity is larger than that of the material of the occlusion layer 22, and the elasticity of the material of the supporting part 21 is required to ensure that the supporting part is not easy to deform and collapse when the supporting part is occluded with the opposite jaw, so that the force for depressing the posterior teeth can be generated; the material of the bite layer 22 is more elastic to increase the comfort of the patient when biting; in some embodiments, the support 21 and the bite layer 22 may be made of different materials, such as PC (polycarbonate), PEG (polyethylene glycol) or TPU (thermoplastic polyurethane) in some embodiments; the material of the bite layer 22 may be edible gel having high elasticity, silicone rubber, thermosetting polyurethane, silicone resin, or the like.

In other embodiments, the supporting portion 21 and the engaging layer 22 may be made of materials having different elastic moduli, and factors affecting the elastic moduli, such as material thickness and material type, are not limited herein. For example, the material elastic modulus of the support portion 21 may range from: 800MPa or more and 3000MPa or less, and more preferably, the elastic modulus of the material of the support portion 21 ranges from 1000MPa to 2000MPa. The elastic modulus of the material of the occluding layer 22 may range from: the elastic modulus of the material of the occluding layer 22 is in the range of 100MPa to 500MPa, which is 5MPa or more and less than 800MPa, more preferably. In this way, the jaw pad 2 formed by the support portion 21 and the occlusion layer 22 can have a good effect of depressing the rear teeth, and can be worn more comfortably by the patient.

In some embodiments, please refer to fig. 2, 3 and 9 again, since the comfort level of occlusion is related to the thickness H of the occlusion layer 22, the thickness H of the occlusion layer 22 is too low, and the comfort level of the patient is insufficient when the patient is biting, such as the thickness H of the occlusion layer 22 is too high, the biting force of the low back teeth is dispersed too much, so, in order to achieve both better comfort and better low back teeth effect, the inventors found that the thickness H of the occlusion layer 22 may be in the range of: the thickness H of the occluding layer 22 is preferably in the range of 1.0mm to 1.5mm, and 0.5mm or more and 2.0mm or less. The thickness H of the occlusal layer 22 is the height of the occlusal layer 22 extending toward the opposite jaw, and when the occlusal layer 22 is approximately planar, the thickness of the occlusal layer 22 at the cross section is uniform; when the shape of the occlusal layer 22 facing the occlusal surface of the jaw is a cambered surface, the thickness of the occlusal layer 22 refers to the maximum height of the occlusal layer 22 extending in the opposite jaw direction, that is, the height from the highest point of the occlusal layer 22 extending in the opposite jaw direction to the surface of the shell-like body 1 covered by the occlusal layer 22.

It should be noted that, under the condition of no contradiction, the above examples can be freely combined according to needs to form different new embodiments, and the embodiments formed by the combination are all within the protection scope of the present application, and are not described herein in detail for the sake of saving the text of the application.

The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.

Likewise, the foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (11)

1. A dental appliance for depressing posterior teeth comprising a shell-like body and a jaw pad for depressing posterior teeth; the shell-shaped body is a shell conforming to the shape of the dentition of a human body and comprises a plurality of cavities which are arranged into a U shape and used for accommodating a plurality of teeth; the jaw pad comprises a supporting part and an occlusion layer, wherein the supporting part is arranged on the occlusion surface of at least part of teeth in the rear tooth area of the shell-shaped body and is convexly arranged towards the jaw direction, and the occlusion layer is arranged on the surface of the supporting part at least opposite to the occlusion surface of the jaw; the material elasticity of the supporting part is smaller than that of the shell-shaped body, and the material elasticity of the engagement layer is larger than that of the supporting part.

2. The dental instrument for depressing a posterior tooth according to claim 1, wherein the support portion is fixed to the posterior tooth region of the shell-like body by means of bonding, welding, clamping or riveting, or the support portion is directly formed on the shell-like body by an additive process.

3. The dental instrument for depressing posterior teeth according to claim 2, wherein the support is a cavitation structure protruding toward the jaw.

4. The dental instrument for depressing a posterior tooth according to claim 1, wherein the support portion is provided separately from the shell-like body, the support portion including a mounting end connected to the shell-like body and an occlusal end opposite the opposing jaw tooth, the mounting end being shaped to match the shape of the mounting surface on the shell-like body, the occlusal layer covering at least the occlusal end.

5. The dental instrument for depressing posterior teeth of claim 4 wherein the support portion is formed by an additive process.

6. The dental instrument for depressing the posterior teeth according to claim 1, wherein the shape of the occlusal layer on the side facing the occlusal plane of the opposite jaw matches the shape of the occlusal plane at the occlusal position of the opposite jaw.

7. The dental instrument for depressing posterior teeth according to claim 1, wherein the occlusal layer is planar or cambered in shape toward the occlusal side of the jaw.

8. Dental appliance for depression of the posterior teeth according to claim 1, wherein the occlusal layer is formed at least on the surface of the support portion opposite to the occlusal surface of the opposing jaw by a hot-press film process, a coating process, an additive process or an adhesive manner.

9. The dental instrument for depressing posterior teeth according to claim 1, wherein the material modulus of elasticity of the support part ranges from: 800MPa or more and 3000MPa or less.

10. The dental instrument for depressing posterior teeth according to claim 1, wherein the occlusal layer has a material elastic modulus ranging from: more than or equal to 5MPa and less than 800MPa.

11. The dental instrument for depressing posterior teeth according to claim 1 or 9 or 10, wherein the thickness of the occlusal layer ranges from: 0.5mm or more and 2.0mm or less.