Dental instrument

Abstract

The utility model discloses a dental instrument which comprises a shell-shaped body and an extension part, the shell-shaped body is provided with a plurality of dental crown containing cavities, the extension part is formed by extending the edge of the lip side and / or the cheek side of the shell-shaped body in the direction away from the occlusal surface, and when the dental instrument is worn, the extension part at least partially wraps gingiva corresponding to the edge; a screen is arranged on the lip side and / or the cheek side of the extension part, the screen protrudes towards the far tooth direction, the screen extends towards the opposite jaw direction along the gingival jaw direction, and the screen is not in contact with the outer surface of the shell-shaped body; wherein the rigidity of the extension part is greater than that of the shell-shaped body, so that the deformation of the extension part of the screen caused by the action of lip muscles and / or buccal muscles when the screen is in contact with the lip muscles and / or buccal muscles is at least partially counteracted. Adjusting perioral muscles and invisible correction are fused, and the correction period is shortened; and when the screen blocks the lip muscle, the buccal muscle or the lip-buccal muscle, the pressure of the lip muscle, the buccal muscle or the lip-buccal muscle can be transmitted to the gingiva through the extension part, adverse effects on teeth are avoided, and the correction effect is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, more specifically to the field of dental instruments, and particularly to a dental instrument. Background Technology

[0002] Current clear aligners have limitations for early treatment of primary, mixed, and permanent dentition, primarily due to the young age of patients. Besides tooth alignment issues, most patients still experience mandibular aberrations and the completion of facial soft tissue development, hindering the formation of a coordinated and stable functional relationship with the jawbone. Therefore, in addition to tooth alignment, functional orthodontic treatment is necessary. Currently, in clinical practice, to address the issue of abnormal perioral muscle function affecting the developing dentition, patients need to wear clear aligners in addition to functional appliances such as cheek shields and lip guards to adjust perioral muscle function. Patients typically wear clear aligners during the day for tooth alignment and functional appliances at night to promote alveolar bone remodeling and maxillofacial reconstruction. However, under normal circumstances, patients with aligned teeth need to wear clear aligners for at least 20 hours a day to achieve the desired treatment effect, while patients with functional aligners need to wear them for at least 10 hours a day to achieve the desired treatment effect. Moreover, it is impossible to perform teeth alignment and myofunctional correction at the same time, which will inevitably lead to a longer treatment cycle and an increase in the number of visits, thereby increasing the patient's treatment costs.

[0003] Currently, a solution to this problem is proposed in a Chinese patent (CN202221674649.8), which includes a dental instrument comprising a first shell-shaped body and a shield. The shield and the first shell-shaped body are connected for use. While the first shell-shaped body is used to orthodontically treat the teeth, the shield can block the pressure exerted on the teeth by the buccal muscles, providing sufficient space for tooth growth and dental arch development. However, this solution still has the following problems: the shield is connected to the tooth receiving cavity of the first shell-shaped body, which is used to enclose the teeth. When the shield blocks the buccal muscles, the pressure of the buccal muscles can still be exerted on the teeth through the tooth receiving cavity, resulting in a less than ideal effect in blocking the pressure of the buccal muscles on the teeth.

[0004] Therefore, this application provides a solution to this problem. Utility Model Content

[0005] The technical problem solved by this utility model is to overcome the defects of the existing technology and provide a dental instrument including a shell-shaped body and an extension. The extension covers the gums and a screen is set on the extension. On the one hand, while the dental instrument is aligning the teeth, it can block the perioral muscles and avoid the perioral muscles from affecting the teeth. On the other hand, when the screen blocks the lip muscles, cheek muscles or lip-cheek muscles, the pressure of the lip muscles, cheek muscles or lip-cheek muscles will be transmitted to the gums through the extension, so as not to cause adverse effects on the teeth and effectively improve the orthodontic effect.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A dental instrument includes a shell-shaped body with multiple crown receiving cavities and an extension. The extension is formed by extending from the labial and / or buccal edges of the shell-shaped body in a direction away from the occlusal surface. When worn, the extension at least partially covers the gingiva corresponding to the edges. A screen is provided on the extension, protruding in the direction of distal teeth and extending in the gingival-occlusal direction towards the opposing teeth. The screen does not contact the outer surface of the shell-shaped body. The rigidity of the extension is greater than that of the shell-shaped body to at least partially offset the deformation of the extension caused by the action of the labial-buccal muscles when the screen contacts them. Thus, the extension reaching the gums can wrap around the gums at the corresponding location, which not only increases the wrapping force of the dental instrument to facilitate the achievement of the orthodontic goal, but also allows the pressure exerted by the lip and / or buccinator muscles to be transmitted to the corresponding gums after the screen is set on the extension, so as not to affect the orthodontic force of the shell body on the teeth. In addition, the stiffness difference design between the extension and the shell body can increase the extension's resistance to deformation, so that the extension will not deform when the screen is subjected to pressure from the lip and / or buccinator muscles, thereby ensuring that the screen can block the lip and / or buccinator muscles as designed.

[0008] Preferably, the width of the extension in the mesiodistal direction is greater than the width of the connection between the extension and the screen in the mesiodistal direction. The width of the extension in the mesiodistal direction satisfies the condition that the extension covers the gingiva covered by the connection in the mesiodistal direction, as well as a portion of the gingiva adjacent to the mesiodistal side and / or distal side. This expands the coverage area of ​​the extension over the gingiva, further enhancing the enveloping force of the dental instrument, strengthening structural stability, dispersing muscle pressure, and preventing deformation caused by localized stress concentration.

[0009] Preferably, the extension is provided with a plurality of reinforcing ridges along the mesiodistal direction, at least covering the width of the connection between the extension and the screen along the mesiodistal direction, and / or, along the gingival-maxillary direction, a plurality of reinforcing ridges are provided with a height of at least covering the connection between the extension and the screen along the gingival-maxillary direction; the reinforcing ridges are elongated. The provision of the reinforcing ridges can improve the stiffness of the extension.

[0010] Preferably, the reinforcing ridge and the extension are an integral structure, with the reinforcing ridge protruding distally from the surface of the extension or concave proximally; or, the reinforcing ridge and the extension are separately disposed, with the reinforcing ridge fixedly connected to the extension. By configuring the reinforcing ridge integrally or separately, different orthodontic scenarios can be flexibly adapted. The integrally molded structure is easier to manufacture and reduces the risk of connection failure. The separate structure facilitates personalized adjustments.

[0011] Preferably, the reinforcing ridge is disposed in a preset area, and the preset area is disposed at a first preset gap with the edge of the extension, so that the edge of the extension can fit against the gum at the corresponding position. When the reinforcing ridge is used to strengthen the rigidity of the extension, maintaining the first gap between the preset area where the reinforcing ridge is disposed and the edge of the extension can preserve the flexibility of the edge of the extension to ensure edge fit, improve comfort, and prevent oral stains from entering the gap between the gum and the extension, thereby avoiding affecting oral hygiene.

[0012] Preferably, there are multiple reinforcing ridges, and the reinforcing ridges are arranged with a second preset gap between them.

[0013] Preferably, the width of the reinforcing ridge ranges from 0.5mm to 1mm, the height of the reinforcing ridge ranges from 0.5mm to 3mm, and the second preset gap ranges from 0.5mm to 1mm. This setting of the reinforcing ridge dimensions and the distance between multiple reinforcing ridges allows for a small reinforcing ridge size but a high density of reinforcing ridges, which can increase the deformation-resistant area of ​​the extension and meet its rigidity requirements. At the same time, the small size of the reinforcing ridges will not cause a foreign body sensation in the oral cavity.

[0014] Preferably, the width of the reinforcing ridge is greater than 1 mm and less than or equal to 2 mm, the height of the reinforcing ridge is between 0.5 mm and 3 mm, and the second preset gap is greater than 1 mm and less than or equal to 2 mm. By setting a slightly larger reinforcing ridge size and increasing the distance between the reinforcing ridges, the distribution density of the reinforcing ridges can be reduced. This maximizes the area of ​​the extension covering the gingiva while meeting stiffness requirements, thus not affecting the wrapping force of the extension.

[0015] Preferably, there is one reinforcing ridge arranged along the mesiodistal direction, and / or one reinforcing ridge arranged along the gingival-maxillary direction, wherein the width of the reinforcing ridge ranges from 2mm to 5mm, and / or the height of the reinforcing ridge ranges from 0.5mm to 3mm.

[0016] Preferably, the reinforcing ridge is arranged along the mesiodistal direction, extending from the mesiodistal edge of the extension to the distal edge of the extension; the reinforcing ridge is also arranged along the gingival-maxillary direction, extending from the progingival edge of the extension to the promaxillary edge of the extension. This continuous reinforcing ridge arrangement forms a continuous reinforcing structure, which can significantly improve the deformation resistance of the extension.

[0017] Preferably, a third preset distance is provided between the connection between the screen and the extension and the reinforcing ridge adjacent to the connection, wherein the third preset distance ranges from 0mm to 2mm.

[0018] Preferably, the elastic modulus of the material of the extension is greater than that of the material of the shell-shaped body. This allows for a difference in stiffness between the extension and the body through material selection; that is, choosing a material with a higher elastic modulus for the extension can improve its resistance to deformation.

[0019] Preferably, the thickness of the extension is greater than the thickness of the shell-shaped body.

[0020] Preferably, the extension has at least two first hook portions along the mesiodistal direction, and a traction member hooks onto the two first hook portions to enhance the stiffness of the extension between the two first hook portions; the width of the first hook portion on the mesiodistal side and the first hook portion on the distal side in the mesiodistal direction at least covers the width of the connection between the extension and the screen in the mesiodistal direction; and / or, the extension has at least two second hook portions along the gingival direction, and a traction member hooks onto the two second hook portions to enhance the stiffness of the extension between the two second hook portions; the height of the second hook portion on the proximal occlusal surface side and the second hook portion on the distal occlusal surface side in the gingival direction at least covers the height of the connection between the extension and the screen in the gingival direction. By providing a traction member, the area resisting deformation is increased, thereby improving the stiffness of the extension.

[0021] Preferably, the extension covers at least one gingiva corresponding to the crown receiving cavity in the anterior and / or posterior regions of the shell-like body. This arrangement is necessary to accurately locate the treatment area and minimize impact on non-target areas.

[0022] Preferably, the edge of the screen facing the opposing jaw does not extend beyond the edge of the corresponding tooth crown away from the gingiva in the gingival direction. This design avoids the screen interfering with occlusal function and improves wearing comfort.

[0023] Preferably, the crown receiving cavity at the corresponding position of the extension is further provided with a retention portion capable of preventing the shell-like body from falling off. The retention portion is an outwardly protruding structure formed by the lingual and / or labial side of the crown receiving cavity protruding towards the distal tooth. This outwardly protruding structure cooperates with a retention attachment adhered to the surface of the crown. Thus, the cooperation of the retention portion and the retention attachment enhances the retention force of the shell-like body, preventing it from falling off.

[0024] Preferably, the screen has several reinforcing ridges, which are arranged along the mesiodistal direction and / or the gingival-maxillary direction. This arrangement can improve the screen's resistance to pressure and prevent deformation from affecting the orthodontic effect. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same numerical reference numerals are denoted as similar elements. Unless otherwise stated, the figures in the drawings do not constitute a limitation on scale.

[0026] Figure 1 This is a schematic diagram of the structure of a dental instrument in an embodiment of the present invention;

[0027] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0028] Figure 3 This is a partial schematic diagram of a dental instrument with reinforcing ridges on the extension and the screen, according to an embodiment of the present invention.

[0029] Figure 4 This is a partial schematic diagram of another dental instrument with a reinforcing ridge on the extension portion, as described in an embodiment of the present invention.

[0030] Figure 5 This is a partial schematic diagram of another dental instrument in this utility model, which has a reinforcing ridge on the extension and the screen.

[0031] Figure 6 This is a partial schematic diagram of a dental instrument with a hook portion provided on the extension portion according to an embodiment of the present invention;

[0032] Figure 7 This is a partial schematic diagram of another dental instrument with a hook portion provided on the extension portion, as described in an embodiment of the present invention.

[0033] Figure 8 This is a partial schematic diagram of another dental instrument with a hook portion provided on the extension portion, according to an embodiment of the present invention;

[0034] Figure 9 This is a schematic diagram of the structure of another dental instrument in an embodiment of this utility model;

[0035] Figure 10 for Figure 9 A magnified view of a portion of region B in the middle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of the invention. However, the technical solutions claimed by this utility model can be implemented even without these technical details and with various variations and modifications based on the following embodiments. The division of the various embodiments below is for ease of description and should not constitute any limitation on the specific implementation of this utility model.

[0037] The directional terms "up," "down," "left," and "right" used in this document refer to the directions shown in the accompanying drawings and do not imply any specific limitation. Unless otherwise explicitly stated or limited, the term "connection" in this document should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part of a structure. It can refer to a direct connection or an indirect connection through an intermediate medium.

[0038] In the various embodiments of this invention, the term "posterior tooth region" is defined according to the classification of teeth in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 36-38. It includes premolars and molars, teeth marked as 4-8 using the FDI notation, and teeth marked as 1-3 using the FDI notation for the anterior tooth region. The teeth in the anterior tooth region include the central incisors, lateral incisors, and canines.

[0039] The technical solution of this application will now be described in conjunction with the accompanying drawings.

[0040] Please refer to Figure 1 and Figure 2 As shown, the dental instrument 100 of this application includes a shell-shaped body 10 having multiple crown receiving cavities 11 and an extension 20. The extension 20 is formed by extending from the labial and / or buccal edges of the shell-shaped body 10 in a direction away from the occlusal surface, and the extension 20 at least partially covers the gingiva 50 corresponding to the edges. See also Figure 1The extension 20 is formed by extending from the buccal edge of the shell-shaped body 10 away from the occlusal surface. When worn, it can cover part of the gingiva 50 at the position corresponding to the buccal teeth 40. The extension 20 is integrally formed with the shell-shaped body 10, for example, by 3D printing. The connection between the integrally formed extension 20 and the shell-shaped body 10 is more reliable, avoiding the risk of connection failure, and is also easier to process. Of course, in another embodiment, the extension 20 can also be formed separately and then connected to the corresponding position of the shell-shaped body 10 by bonding or laser welding. The separate setting not only facilitates the cleaning and replacement of each component, but also allows for the selection of appropriate processing materials according to the rigidity requirements of each component. In yet another embodiment, the extension 20 can also be formed on the labial side of the anterior tooth area of ​​the shell-shaped body 10. When worn, the extension 20 can at least cover part of the gingiva at the position corresponding to the labial teeth. In yet another embodiment, the extension 20 can also be formed on both the labial side of the anterior tooth area and the buccal side of the posterior tooth area of ​​the shell-shaped body 10.

[0041] Accordingly, a screen 30 is provided on the buccal, labial, or labiobuccal side of the extension 20. On the buccal-lingual side, the screen 30 protrudes away from the teeth 40; on the gingival-occlusal side, the screen 30 extends towards the opposing jaw. When worn, the screen 30 does not contact the outer surface of the shell-like body 10, thus blocking the forces exerted by the lip muscles, buccal muscles, or labiobuccal muscles on the teeth that inhibit their growth and development. For details, please continue reading. Figure 1 As shown, the screen is set for teeth 2-6 on both sides, and the screen covers part of the anterior teeth and part of the posterior teeth, blocking the pressure of the lip and cheek muscles. In another embodiment, when the screen is set for the anterior teeth, the screen blocks the pressure of the lip muscles. In yet another embodiment, when the screen is set for the posterior teeth, the screen blocks the pressure of the cheek muscles.

[0042] The extension 20 has a stiffness greater than that of the shell-like body 10, at least partially offsetting the deformation of the extension 20 caused by the action of the buccinator, lip, or buccinator muscles when the screen 30 contacts the buccinator, lip, or buccinator muscles. Thus, the extension 20 extending to the gingiva can wrap around the corresponding gingiva 50, increasing the wrapping force of the dental instrument 100 to facilitate the achievement of the orthodontic goal. Furthermore, the screen 30 on the extension 20 allows the pressure applied by the buccinator, lip, or buccinator muscles to be transmitted to the corresponding gingiva, thus not affecting the orthodontic force of the shell-like body 10 on the teeth. In addition, the difference in stiffness between the extension 20 and the shell-like body 10 increases the extension 20's resistance to deformation, ensuring that the extension 20 will not deform when the screen 30 is subjected to pressure from the buccinator, lip, or buccinator muscles, thereby ensuring that the screen 30 can block the buccinator, lip, or buccinator muscles as designed. Furthermore, in order to enhance the resistance of the screen 30 to deformation under pressure from the buccal muscles, a reinforcing ridge 32 can be provided on the screen 30.

[0043] Furthermore, the extension 20 has a structure that provides stable contact with the corresponding gingiva. Specifically, the gingival surface of the extension 20 can be a curved structure, a planar structure, or a structure with protrusions. Preferably, a curved structure that substantially matches the shape of the corresponding gingiva is adopted. This structure allows the extension 20 to completely fit and cover the corresponding gingiva, enhancing the control of the shell-like body 10 over the corresponding gingiva and solving the problem that the shell-like body 10 is prone to falling off the teeth when the patient's teeth are small, such as in children's deciduous teeth or early mixed dentition in adolescents. Specifically, when the patient wears it, the screen 30 blocks the force exerted by the lip muscles, buccinator muscles, or lip-buccal muscles on the teeth, which inhibits their growth and development. The screen 30, located on the extension 20, can also transmit the pressure of the lip muscles, buccinator muscles, or lip-buccal muscles to the corresponding gingiva, thereby enhancing the control of the shell-like body 10 over the corresponding gingiva during wear and making it less likely to fall off the teeth.

[0044] It should also be noted that the shell-shaped body 10 may have the function of aligning teeth. Specifically, the shell-shaped body 10 has a geometric structure that moves at least part of the teeth being housed from a first position to a second position. The first position may be the initial position of the teeth in any orthodontic step, and the corresponding second position is the target position of the teeth in that step. Of course, the shell-shaped body 10 may also not have the function of aligning teeth.

[0045] Further explanation: the width dimension D1 of the extension 20 is greater than the width dimension D2 of the connection 31 between the extension 20 and the screen 30 along the mesiodistal direction. The width dimension D1 of the extension 20 in the mesiodistal direction satisfies the following condition: the extension 20 encloses the gingiva 50 covered by the connection 31 in the mesiodistal direction, as well as the mesiolateral and / or distal portion of the gingiva adjacent to the gingiva 50. Please refer to... Figure 3 As shown, the extension 20 covers the gingiva 50 corresponding to one crown receiving cavity 11 in the posterior tooth region, as well as the portion of the gingiva corresponding to one adjacent mesial crown receiving cavity 11 and the portion of the gingiva corresponding to one adjacent distal crown receiving cavity 11, along the mesiodistal direction. The screen 30 is disposed on the extension 20 and is spaced apart from the edge of the extension 20. In another embodiment, the extension 20 can cover a larger area, such as covering the gingiva corresponding to three crown receiving cavities 11 in the posterior tooth region. This expands the coverage area of ​​the extension 20 over the gingiva 50, further enhancing the wrapping force of the shell-like body 10, strengthening structural stability, dispersing muscle pressure, and preventing deformation caused by localized stress concentration.

[0046] In another embodiment, to ensure contact between the extension 20 and the gingiva, the extension 20 must cover at least one gingiva corresponding to the crown receiving cavity 11 in the anterior and / or posterior regions of the shell-like body 10. In one embodiment, the extension 20 only covers one gingiva corresponding to the crown receiving cavity 11 in the posterior region, and the connection 31 between the barrier 30 and the extension 20 is located in the central region of the extension 20, maintaining a distance from at least the edges of the extension 20. This arrangement minimizes the impact on non-target areas while considering the need for barrier coverage.

[0047] To further explain, in order to ensure the rigidity of the extension 20 and improve its resistance to deformation when the screen 30 is subjected to pressure from the buccinator, lip, or buccinator muscles, a plurality of reinforcing ridges 21 may be provided along the mesiodistal direction X, at least covering the width of the connection 31 between the extension 20 and the screen 30 along the mesiodistal direction, and / or, along the gingival-maxillary direction Y, a plurality of reinforcing ridges 21 may be provided at least covering the height of the connection 31 between the extension 20 and the screen 30 along the gingival-maxillary direction; the reinforcing ridges 21 are elongated. It should be noted that, please refer to [the relevant documentation / references]. Figures 3 to 5As shown, in the mesiodistal direction X, the width of the connection 31 is at least covered, meaning the width D3 of the reinforcing ridge 21 along the mesiodistal direction X is greater than the width D2 of the connection 31 along the mesiodistal direction X. When there are multiple reinforcing ridges 21, the width of the reinforcing ridge 21 with the smallest width along the mesiodistal direction is greater than the width of the connection 31. In the gingival-maxillary direction, the height of the connection 31 is at least covered, meaning the height h2 of the reinforcing ridge 21 along the gingival-maxillary direction Y is greater than the height h1 of the connection 31 along the gingival-maxillary direction Y. When there are multiple reinforcing ridges 21, the height of the reinforcing ridge 21 with the smallest height along the gingival-maxillary direction Y is greater than the height of the connection 31. Further, as... Figure 5 As shown, in order to enhance the overall resistance to deformation of the extension 20 and the screen 30 under pressure from the buccal muscles, the reinforcing ridge along the gingival direction can also extend to the screen 30 and penetrate the gingival direction of the screen 30.

[0048] Furthermore, the reinforcing ridge 21 can be integrally formed with the extension 20, protruding distally or concavely from a local surface of the extension 20, and can be positioned along the mesiodistal direction X or the gingival-occlusal direction Y. This integrally formed configuration facilitates manufacturing and reduces the risk of connection failure. Further, the reinforcing ridge 21 is preferably an elongated strip with a width greater than the width of the connection 31 in the mesiodistal direction X, or an elongated strip with a height greater than the height of the connection 31 in the gingival-occlusal direction Y. In another embodiment, the reinforcing ridge 21 can also be a plurality of small protrusions or grooves, regularly arranged along the width direction of the extension 20 in the mesiodistal direction X or the height direction in the gingival-occlusal direction Y. When the surface of the extension 20 is curved, the surface curvature of the reinforcing ridge 21 is greater than the surface curvature of the extension 20. The reinforcing ridge 21 can also be separately disposed from the extension 20, and after being manufactured separately, it can be fixed to the surface of the extension 20 by means of bonding, welding or other methods. This separate structure allows for personalized adjustments, such as adjusting the structural dimensions of the reinforcing ridge 21 to meet the required stiffness.

[0049] For further explanation, please refer to [link / reference]. Figure 3 and Figure 4 As shown, the reinforcing ridge 21 is disposed in a preset region 22, and the preset region 22 is disposed with a first preset gap L1 between it and the edge of the extension 20, so that the edge of the extension 20 can fit against the gingiva 50 at the corresponding position. It should be noted that the preset region 22 is the area formed by the two ends of the reinforcing ridge 21 and the edge of the reinforcing ridge 21 along its long axis, for example... Figure 3 and Figure 4As shown, the upper edge of the preset region 22 is formed by the edge of the nearest reinforcing ridge 21 on the tooth-distal side of the extension 20, and the lower edge is formed by the edge of the nearest reinforcing ridge 21 on the tooth-proximal side of the extension 20. The left and right edges are formed by the edges of the left and right ends of the reinforcing ridge 21, respectively. When there is only one reinforcing ridge 21, the upper, lower, left, and right edges of this reinforcing ridge form the boundary lines of the preset region. By maintaining a first preset gap L1 with the edge of the extension 20, for example, a gap of 0.5mm-2mm in clinical practice, the flexibility of the edge of the extension 20 can be preserved to ensure the fit between the edge and the gingiva 50, thus improving comfort.

[0050] To further explain, the reinforcing ridge 21 can be set to multiple, and the reinforcing ridges 21 are set with a second preset gap L2. It should be noted that the second preset gap L2 between the multiple reinforcing ridges 21 can be uniform or inconsistent, and can be flexibly set as needed.

[0051] In one embodiment, multiple reinforcing ridges 21 can be arranged in a high-density manner, characterized by being "small and numerous," that is, multiple ridges with small dimensions and a small second preset gap L2. It should be noted that "small" refers to the width and height dimensions of the reinforcing ridges 21, and "numerous" refers to the number of reinforcing ridges 21. For example, the width of the reinforcing ridges 21 can be set in the range of 0.5mm-1mm, the height of the reinforcing ridges 21 can be set in the range of 0.5mm-3mm, and the second preset gap L2 can be set in the range of 0.5mm-1mm. For example, in a specific embodiment, the width of the reinforcing ridge 21 is 0.8mm, the height of the reinforcing ridge 21 is 1mm, and the second preset gap L2 is 1mm. Such a size setting for the reinforcing ridge 21 and the distance setting between multiple reinforcing ridges 21 can achieve a small size for the reinforcing ridges 21, but a high density of reinforcing ridges 21. This increases the deformation-resistant area of ​​the extension 20 and meets its rigidity requirements. At the same time, the small size of the reinforcing ridges 21 can reduce the foreign body sensation in the oral cavity and improve patient comfort.

[0052] In another embodiment, multiple reinforcing ridges 21 can be arranged in a low-density manner, characterized by being "large and few," on the surface of the extension 20. It should be noted that "large" refers to the width and height dimensions of the reinforcing ridges 21, and "few" refers to the number of reinforcing ridges 21. For example, the width of the reinforcing ridges 21 can be greater than 1 mm and less than or equal to 2 mm, the height of the reinforcing ridges 21 can be set to a range of 0.5 mm to 3 mm, and the second preset gap L2 can be set to a range of greater than 1 mm and less than or equal to 2 mm. For instance, in one specific embodiment, the width of the reinforcing ridges 21 is 1.5 mm, the height of the reinforcing ridges 21 is 1.5 mm, and the second preset gap L2 is 2 mm. Thus, with a small number of reinforcing ridges 21 and a low distribution density, the rigidity requirements can be met by setting larger reinforcing ridge sizes. Simultaneously, the area of ​​the extension 20 covering the gingiva can be increased, thereby not affecting the covering force of the extension 20.

[0053] Further explanation: In one embodiment, the reinforcing ridge 21 may be provided as a single ridge, which may be arranged along the mesiodistal direction (X) or the gingival-maxillary direction (Y). The width of the reinforcing ridge 21 ranges from 2mm to 5mm, and / or the height of the reinforcing ridge 21 ranges from 0.5mm to 3mm. For example, in some specific embodiments, the width of the reinforcing ridge 21 is 5mm, or the height of the reinforcing ridge 21 is 3mm, or the width of the reinforcing ridge 21 is 4mm and the height of the reinforcing ridge 21 is 2mm.

[0054] To further explain, when there is only one reinforcing ridge 21, in order to ensure that the reinforcing ridge 21 can provide sufficient resistance to deformation for the extension, this application can also extend the reinforcing ridge 21 through two opposite edges of the extension 20 at both ends. In one embodiment, when the reinforcing ridge 21 is arranged along the mesiodistal direction X, the reinforcing ridge 21 extends from the mesiodistal edge of the extension 20 to the distal edge of the extension 20; in another embodiment, when the reinforcing ridge 21 is arranged along the gingival-maxillary direction, the reinforcing ridge 21 extends from the progingival edge of the extension 20 to the promaxillary edge of the extension 20. This through-through reinforcing ridge 21 forms a continuous reinforcing structure on the extension 20, which can significantly improve the deformation resistance of the extension 20.

[0055] For further explanation, please refer to the following: Figure 4As shown, a third preset gap L3 is provided between the connection 31 of the screen 30 and the extension 20 and the reinforcing ridge 21 adjacent to the connection 31, wherein the third preset gap L3 ranges from 0mm to 2mm. With this third preset gap L3 setting, for example, when the third preset gap L3 is 0mm, or when the third preset gap L3 is any other spacing less than or equal to 2mm, the degree of wrapping and fitting of the extension 20 around the connection 31 is relatively low, which will affect the connection reliability of the connection 31.

[0056] To further explain, to improve the stiffness of the extension 20, it can be achieved by selecting a material with a larger elastic modulus to manufacture the extension 20 or by increasing the thickness of the extension 20. Specifically, the elastic modulus of the material of the extension 20 is greater than that of the shell-shaped body 10, and / or the thickness of the extension 20 is greater than the thickness of the shell-shaped body 10. In one embodiment, the materials used to manufacture the extension 20 and the shell-shaped body 10 are different. Specifically, the extension 20 is made of a material with a larger elastic modulus, while the shell-shaped body 10 is made of a material with a smaller elastic modulus. In another embodiment, this can also be achieved by increasing the thickness of the extension 20; a greater thickness results in greater resistance to deformation. In yet another embodiment, both a material with a large elastic modulus and an increased thickness can be used to simultaneously improve the stiffness of the extension 20.

[0057] Furthermore, the rigidity of the extension 20 can be increased by adding a traction member 24 to increase the area resisting deformation. In one embodiment, please refer to... Figure 6 As shown, the extension 20 is provided with four first hook portions 23. A traction element 24 (such as an orthodontic elastic band) is hooked between two of the first hook portions 23 arranged along the mesiodistal direction X, to enhance the rigidity of the extension 20 between the two first hook portions 23. Furthermore, the width D4 of the first hook portion 23 on the mesiodistal side and the first hook portion 23 on the distal side in the mesiodistal direction, i.e., the length of the hooked traction element 24 (such as an elastic band), needs to be greater than the width D2 of the connection point 31 between the extension 20 and the screen 30 in the mesiodistal direction X. Of course, the number of first hook portions 23 and the number of hooked traction elements 24 can be selected according to clinical needs.

[0058] In another embodiment, please refer to Figure 7As shown, the extension 20 is provided with four second hooks, and a traction member 24 (such as an orthodontic elastic band) is hooked between two of the second hooks arranged in the gingival direction Y to enhance the rigidity of the extension 20 between the two second hooks. Furthermore, the height h3 of the second hook on the side near the occlusal surface and the second hook on the side away from the occlusal surface in the gingival direction Y, that is, the length of the hook traction member 24 (such as an elastic band), needs to be greater than the height h1 of the connection 31 between the extension 20 and the screen 30 in the gingival direction Y.

[0059] In yet another embodiment, please refer to Figure 8 As shown, the second hook and the first hook 23 can be reused. When a traction member is hooked between the two first hooks 23 along the mesiodistal direction X, another traction member can be hooked in the gingival direction at the same time, thereby enhancing the deformation resistance of the extension 20 in the mesiodistal direction X and the gingival direction Y.

[0060] To further explain, in order to avoid the screen blocking 30 from interfering with the bite function and to improve wearing comfort, please continue reading. Figure 1 and Figure 2 As shown in this application, the gingival-occlusal height of the projection of the screen 30 onto the corresponding crown surface does not exceed the incisal or occlusal end of the corresponding crown. When the screen 30 is disposed on the extension 20 corresponding to the crown receiving cavity 11 in the anterior tooth region, the height of the screen 30 in the gingival-occlusal direction does not exceed the incisal end of the corresponding crown. Specifically, when the screen 30 is projected onto the surface of the corresponding crown, the edge of the screen 30 away from the gingiva does not exceed the incisal end of the corresponding crown. For example, it can be flush with the incisal end of the corresponding crown. Especially for screens 30 disposed in the anterior tooth region, this arrangement can also avoid affecting the aesthetics when opening the mouth. Similarly, when the screen 30 is disposed on the extension 20 corresponding to the crown receiving cavity 11 in the posterior tooth region, the height of the screen 30 in the gingival-occlusal direction does not exceed the occlusal end of the corresponding crown.

[0061] To further explain, in order to improve the stability of the dental instrument 100 after wearing, the crown receiving cavity 11 at the corresponding position of the extension 20 is also provided with a retention part 12 that can prevent the shell-shaped body 10 from falling off. Please refer to [link / reference needed]. Figure 9 and Figure 10As shown, the retention portion 12 is an outwardly projecting structure formed by protruding from the buccal or lingual side (not shown) of the crown receiving cavity 11 toward the distal tooth. This outwardly projecting structure cooperates with the retention attachment 41 adhered to the surface of the crown. In another embodiment, multiple retention attachments 41 can be provided, which can be provided on crown receiving cavities 11 of different or the same tooth. Specifically, multiple retention portions 12 are provided on multiple crown receiving cavities 11 corresponding to the extension 20. For example, one retention portion 12 can be provided on each of the multiple crown receiving cavities 11, or multiple retention portions 12 can be provided on one crown receiving cavity 11. In yet another embodiment, the retention portion 12 can also be provided on other crown receiving cavities 11 not corresponding to the extension 20, which can also enhance the retention force of the shell-shaped body 10, prevent the shell-shaped body 10 from falling off, and thus enhance the stability of the dental instrument 100 after wearing.

[0062] To further explain, in order to improve the compressive and deformation resistance of the screen 30 and prevent deformation of the screen 30 from affecting the orthodontic effect, the screen 30 may also be provided with a plurality of reinforcing ridges 32, which may be arranged along the mesiodistal direction (e.g., Figure 1 As shown), or, set along the gingival-maxillary direction (e.g. Figure 5 (As shown), or simultaneously provided in the mesial, distal, and gingival directions. Further, the reinforcing ridge 32 is a convex or concave structure with a surface curvature greater than that of the screen 30, thereby increasing the rigidity of the screen 30 by increasing its surface area and preventing deformation under pressure from the buccinator or lip muscles. The cavitation structure can be a plurality of convex or concave dot structures, or one or more convex or concave elliptical structures. Figure 1 and Figure 5 The reinforcing ridge 32 shown is disposed on the cheek side of the screen 30. In other embodiments, the reinforcing ridge 32 may also be disposed on the tongue side of the screen 30. Alternatively, the reinforcing ridge 32 may be a separate component, attached to either the cheek side or the tongue side of the screen 30.

[0063] It should be noted that further details are needed. Figure 9 , Figure 9 The retention portion 12 and the reinforcing ridge 32 structure on the screen 30 shown can be provided simultaneously in the same embodiment; alternatively, in one embodiment, the retention portion 12 that can improve the wearing stability of the dental instrument 100 can be provided only on the extension 20; alternatively, in another embodiment, the reinforcing ridge 32 for improving the rigidity of the screen 30 can be provided only on the buccal, labial, or lingual side of the screen 30. There are no limitations here, and all can be selected according to the clinical situation.

[0064] It should be noted that the above embodiments can be freely combined as needed to form different new implementation schemes without causing contradictions. All implementation schemes formed by such combinations are within the protection scope of this application. In order to save space in the application text, they will not be described in detail here.

[0065] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the inventive principle of this invention, and these improvements and modifications should also be considered within the scope of protection of this application.

[0066] Similarly, the above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A dental instrument, characterized in that, It includes a shell-shaped body with multiple crown receiving cavities and an extension portion. The extension portion is formed by extending from the labial and / or buccal edges of the shell-shaped body in a direction away from the occlusal surface. When worn, the extension portion at least partially covers the gingiva corresponding to the edges. A screen is provided on the extension portion, the screen protruding towards the distal tooth and extending along the gingival-occlusal direction towards the opposing tooth; the screen does not contact the outer surface of the shell-like body; wherein... The stiffness of the extension is greater than that of the shell-shaped body, so as to at least partially offset the deformation of the extension caused by the action of the lip and cheek muscles when the screen comes into contact with them.

2. The dental instrument according to claim 1, characterized in that, The width of the extension in the mesiodistal direction is greater than the width of the connection between the extension and the screen in the mesiodistal direction, wherein the width of the extension in the mesiodistal direction satisfies the following condition: the extension covers the gingiva covered by the connection in the mesiodistal direction and the mesiolateral and / or distal portion of the gingiva adjacent to the gingiva.

3. The dental instrument according to claim 1 or 2, characterized in that, The extension is provided with a plurality of reinforcing ridges along the mesiodistal direction, at least covering the width of the connection between the extension and the screen along the mesiodistal direction, and / or, along the gingival direction, a plurality of reinforcing ridges are provided with a height of at least covering the connection between the extension and the screen along the gingival direction; the reinforcing ridges are elongated.

4. The dental instrument according to claim 3, characterized in that, The reinforcing ridge and the extension are integral structures. The reinforcing ridge is formed by protruding from the surface of the extension toward the distal tooth or concave inward toward the proximal tooth; or, the reinforcing ridge and the extension are integrally disposed and fixedly connected.

5. The dental instrument according to claim 3, characterized in that, The reinforcing ridge is disposed in a preset area, and the preset area is disposed with a first preset gap from the edge of the extension, so that the edge of the extension can fit the gum at the corresponding position.

6. The dental instrument according to claim 3, characterized in that, There are multiple reinforcing ridges, and the reinforcing ridges are arranged with a second preset gap between them.

7. The dental instrument according to claim 6, characterized in that, The width of the reinforcing ridge ranges from 0.5mm to 1mm, the height of the reinforcing ridge ranges from 0.5mm to 3mm, and the second preset gap ranges from 0.5mm to 1mm.

8. The dental instrument according to claim 6, characterized in that, The width of the reinforcing ridge is greater than 1 mm and less than or equal to 2 mm, the height of the reinforcing ridge is between 0.5 mm and 3 mm, and the second preset gap is greater than 1 mm and less than or equal to 2 mm.

9. The dental instrument according to claim 3, characterized in that, The reinforcing ridge is provided in one direction along the mesiodistal direction, and / or, the reinforcing ridge is provided in one direction along the gingival-maxillary direction, wherein the width of the reinforcing ridge is in the range of 2mm-5mm, and / or, the height of the reinforcing ridge is in the range of 0.5mm-3mm.

10. The dental instrument according to claim 9, characterized in that, The reinforcing ridge is provided along the mesiodistal direction, and the reinforcing ridge extends from the mesiodistal edge of the extension to the distal edge of the extension; the reinforcing ridge is provided along the gingival-maxillary direction, and the reinforcing ridge extends from the progingival edge of the extension to the promaxillary edge of the extension.

11. The dental instrument according to claim 3, characterized in that, The screen is provided with a third preset distance between the connection between the screen and the extension and the reinforcing ridge adjacent to the connection, wherein the third preset distance ranges from 0mm to 2mm.

12. The dental instrument according to claim 1, characterized in that, The elastic modulus of the material of the extension is greater than that of the material of the shell-shaped body.

13. The dental instrument according to claim 1, characterized in that, The thickness of the extension is greater than the thickness of the shell-shaped body.

14. The dental instrument according to claim 1, characterized in that, The extension is provided with at least two first hooks along the mesio-medial direction, and a traction member is hooked onto the two first hooks to enhance the rigidity of the extension between the two first hooks; among the two first hooks, the width of the first hook on the mesio-medial side and the first hook on the distal side in the mesio-medial direction at least covers the width of the connection between the extension and the screen in the mesio-medial direction. And / or, The extension is provided with at least two second hooks along the gingival direction, and a traction member is hooked onto the two second hooks to enhance the rigidity of the extension between the two second hooks; of the two second hooks, the height of the second hook on the side near the occlusal surface and the second hook away from the occlusal surface along the gingival direction at least covers the height of the connection between the extension and the screen in the gingival direction.

15. The dental instrument according to claim 1, characterized in that, The extension at least covers the gingiva corresponding to one of the crown receiving cavities on the shell-like body.

16. The dental instrument according to claim 1, characterized in that, The edge of the shield facing the opposing side does not extend beyond the edge of the crown of the tooth corresponding to the shield on the side away from the gingiva in the gingival direction.

17. The dental instrument according to claim 1, characterized in that, The crown receiving cavity at the corresponding position of the extension is also provided with a retention part that can prevent the shell-shaped body from falling off. The retention part is an outwardly protruding structure formed by the lingual and / or labial side of the crown receiving cavity protruding towards the distal tooth. The outwardly protruding structure cooperates with the retention attachments pasted on the surface of the crown.

18. The dental instrument according to claim 1 or 2, characterized in that, The screen is provided with a plurality of reinforcing ridges, which are arranged along the mesiodistal direction and / or the gingival-maxillary direction.

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