Dental instrument

Abstract

The utility model discloses a dental instrument which comprises a shell-shaped body and a palate bar used for being connected to a rear tooth area of a patient in a matched mode, the palate bar comprises two retention connected crowns used for being connected with teeth in the rear tooth area on the left side and the right side in a matched mode and a plurality of palate connecting rods connected between the two retention connected crowns, the inner contours of the retention linked crowns on the left side and the right side are matched with the outer contours of the teeth at the corresponding positions of the patient; teeth in the rear tooth area are matched and connected with the retention connected crown to form a composite module; the shell-shaped body comprises a first section and a second section for accommodating the composite module, the first section is used for accommodating other teeth except the teeth matched and connected with the composite module, and the inner contour shape of an accommodating cavity of the second section is consistent with the outer contour shape of the composite module; a retention accessory is arranged on the cheek side and / or the tongue side of the retention linked crown, and a matching part matched with the retention accessory is arranged at the position, corresponding to the retention accessory, of the second section.

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] In the field of orthodontic treatment, invisible aligners are highly favored for their aesthetics and comfort. However, invisible aligners still have some shortcomings and limitations, especially in cases involving tooth extraction. In scenarios such as anterior tooth retraction, posterior tooth axial inclination control, and closure of extraction gaps, insufficient anchorage often leads to poor orthodontic results.

[0003] In existing technologies, some orthodontic technicians have considered combining fixed orthodontic treatment with clear aligners to address this problem. For example, Chinese patent application number CN202021059242.5 discloses a technical solution that combines clear aligners and fixed orthodontic treatment to enhance posterior tooth anchorage. This solution involves attaching auxiliary orthodontic devices to multiple tooth surfaces in the posterior region and inserting archwires for fastening, thus making the posterior region a unified whole. Although this technical solution can enhance the anchorage of posterior teeth to a certain extent, it still has the following problems: (1) Multiple auxiliary orthodontic appliances need to be pasted on the surface of multiple teeth in the posterior tooth area, and archwires for fastening need to be inserted inside them. This is time-consuming and laborious to operate in a narrow oral space. Especially for patients with short crowns, there may be a risk that the bonding may not be secure or even fail due to the small surface area of ​​the teeth. (2) This technical solution can only use the teeth in the left and right posterior tooth areas as two parts as anchorage, and cannot further bind the teeth in the left and right posterior tooth areas into a stronger anchorage. When the left and right sides are used as anchorage, it is still not enough to meet the orthodontic needs, and other anchorages need to be added. Utility Model Content

[0004] The technical problem solved by this invention is to overcome the defects of the existing technology and provide a dental instrument with a reasonable structure, enhanced posterior tooth anchorage and good retention.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A dental instrument includes a shell-shaped body and a palatal bar for fitting into the posterior region of a patient. The palatal bar includes two retention crowns for fitting into the left and right posterior teeth and a plurality of palatal connecting rods connecting the two retention crowns. The inner contours of the left and right retention crowns match the outer contours of the teeth at corresponding positions on the patient's side. The posterior teeth, after fitting the retention crowns, form a composite module. The shell-shaped body includes a first segment and a second segment for accommodating the composite module. The first segment accommodates teeth other than those fitted into the composite module, and the inner contour shape of the cavity in the second segment matches the outer contour shape of the composite module. Retention attachments are provided on the buccal and / or lingual sides of the retention crowns, and the second segment has a matching portion corresponding to the position of the retention attachments.

[0007] This application achieves a close fit between the inner contours of the left and right retention crowns and the outer contours of the corresponding teeth on the patient's teeth, ensuring the stability and retention of the composite module. Furthermore, for patients with short crowns, there is no risk of fitting failure. The larger volume of the composite module formed after fitting the retention crowns also facilitates stable integration with the shell-like body, improving the stability of the dental instrument and providing a solid foundation for subsequent orthodontic treatment. Moreover, the palatal bar connects the posterior teeth fitted with the left and right retention crowns into a unified whole, forming a comprehensive posterior anchorage that significantly enhances anchorage function. Additionally, the matching part and the concave-convex fit of the retention attachment enhance the retention effect of the shell-like body, avoiding the risk of dislodgement. Finally, the palatal bar structure of this application integrates anchorage enhancement and retention functions, requiring only one installation to complete the installation of the retention attachment and anchorage binding device, making installation simple and convenient.

[0008] Preferably, the retention crown includes at least one clasp that wraps around the side of the tooth, wherein the clasp wraps around at least one of 1-4 teeth in the posterior region. This clasp structure circumferentially wraps around the side of the tooth, enhancing the retention crown's fixation effect on the tooth side, firmly securing the tooth, preventing loosening or dislodgement during use, and improving the stability of the dental instrument during wear. Furthermore, the circumferential clasp structure disperses stress, reducing damage to the tooth surface.

[0009] Preferably, the retaining crown further includes an occlusal portion that at least partially covers the occlusal surface of the tooth, the shape of which conforms to the shape of the occlusal surface of the tooth being covered. On the one hand, by setting the shape of the occlusal portion to conform to the shape of the occlusal surface of the tooth being covered, the mating can be made more stable; on the other hand, the occlusal portion can further increase the mating area between the retaining crown and the tooth, further enhancing the stability of the mating.

[0010] Preferably, the occlusal portion has a through hole at the corresponding tooth cusp for the tooth cusp to pass through. This through hole arrangement allows the occlusal portion of the retaining crown and the tooth cusp to form a mechanical restraint, reducing movement between the retaining crown and the tooth. After mating, the retaining crown provides excellent retention between the crown and the tooth.

[0011] Preferably, the surface of the retention attachment near the gingiva is a concave curved surface moving away from the gingiva. This curved surface design increases the contact area between the retention attachment and the corresponding position of the second segment, thereby improving the retention effect.

[0012] Preferably, the buccal and / or lingual sides of the retaining crown are further provided with functional attachments, and the second section is provided with an avoidance structure or a through hole structure at the position corresponding to the functional attachments, wherein the functional attachments are one of a traction device, a bracket, a buccal tube, or a sleeve.

[0013] Preferably, when there are multiple palatal connecting rods, the multiple palatal connecting rods are arranged in parallel, and / or the distance between two adjacent palatal connecting rods is equal. This arrangement can enhance the balance and stability of the overall structure of the dental instrument, evenly distribute the corrective force, avoid local stress concentration, and improve the predictability of the orthodontic effect.

[0014] Preferably, the two ends of the palatal connecting rod are respectively connected to the lingual sides of the left and right sides of the retaining crown. The palatal connecting rod is arched towards the hard palate, and there is a gap between the side of the palatal connecting rod facing the hard palate and the patient's hard palate in the vertical direction. The gap is greater than 0 and less than or equal to 10 mm. This arched design of the palatal connecting rod conforms to the anatomical structure of the hard palate, improving the comfort of wearing dental instruments. At the same time, maintaining a gap between the palatal connecting rod and the hard palate can also avoid excessive pressure on the hard palate by the palatal connecting rod, reducing the feeling of a foreign body.

[0015] Preferably, the palatal connecting rod is provided with a first traction hook for hooking the traction member, and a second traction hook is provided on the lingual side of the anterior tooth region of the first section. The traction member is hooked on the first traction hook and the second traction hook to apply traction force to the teeth in the anterior tooth region.

[0016] Preferably, the retaining accessory and the retaining crown are integrally formed, and / or the retaining crown and the palatal connecting rod are integrally formed; the palatal rod is manufactured by casting or 3D printing. This integrally formed structure improves the structural strength and precision between connected structures, reduces micro-movements between structures, extends service life, and ensures stable connection. Attached Figure Description

[0017] 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.

[0018] Figure 1 This is a schematic diagram of the structure of a dental instrument and composite model according to the present invention;

[0019] Figure 2 This is a schematic diagram of a composite model equipped with a palatal bar in this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a palatal bar in the dental instrument of this utility model;

[0021] Figure 4 A schematic diagram of another palatal bar in the dental instrument of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of another palatal bar in the dental instrument of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of a retention attachment in the dental instrument of this utility model from a certain perspective;

[0024] Figure 7 This is a schematic diagram of another retention attachment in the dental instrument of this utility model from a certain perspective;

[0025] Figure 8 This is a schematic diagram of the structure of another dental instrument in this utility model;

[0026] Figure 9 This is a schematic diagram of the structure of another dental instrument in this utility model. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The following will provide a detailed explanation in conjunction with the illustrations.

[0031] Please refer to Figure 1 and Figure 2 As shown, it should be noted that Figure 1 and Figure 2The schematic diagram of reference numeral 30 is a structural schematic diagram of a composite model consistent with the patient's dentition and palatal tissue. To facilitate the demonstration of the morphology of the retaining crowns after attachment to the teeth, this composite model 30 is used to illustrate the patient's actual dentition and palatal tissue. The dental instrument 100 of this application includes a shell-shaped body 10 and a palatal bar 20 for attachment to the patient's posterior teeth. The palatal bar 20 includes two retaining crowns 21 and a plurality of palatal connecting rods 22 connecting the two retaining crowns 21. Two retaining crowns 21 are respectively positioned corresponding to the posterior teeth on the left and right sides of the patient, and are used to fit the teeth on the left and right sides of the posterior teeth. Furthermore, the inner contours of the left and right retaining crowns 21 match the outer contours of the teeth at the corresponding positions on the patient, and the left and right retaining crowns 21, after fitting with the teeth on the left and right sides of the patient's posterior teeth, form a composite module 40. Thus, by matching the inner contours of the left and right retaining crowns 21 with the outer contours of the teeth at the corresponding positions on the patient's teeth, a tight fit between the retaining crowns 21 and the patient's teeth is achieved. The close fit ensures the stability and retention of the composite module 40. Especially in cases where patients have short crowns, such as children, the shell-shaped body 10 is prone to falling off during treatment due to its small size and limited effective area, hindering the achievement of optimal treatment results. The composite module 40 formed by the retention crowns 21, after being fitted to the teeth, compensates for the problem of the shell-shaped body 10 easily falling off due to short crowns, thus achieving stable wearing of invisible orthodontics and providing a solid foundation for subsequent orthodontic treatment. The palatal connecting rod 22 connects the left and right retention crowns 21, linking the posterior teeth fitted by the retention crowns 21 into a single unit. This design enhances the anchorage function of the posterior teeth, resulting in a more significant anchorage effect.

[0032] The shell-shaped body 10 includes a first segment 11 corresponding to the teeth in the anterior region and a second segment 12 corresponding to the teeth in the posterior region. The second segment 12 is provided with a receiving cavity to accommodate the composite module 40. The inner contour shape of the receiving cavity of the second segment 12 is consistent with the outer contour shape of the composite module 40. This arrangement is used to ensure the stability of the receiving cavity of the second segment 12 and the composite module 40 when worn. The first segment 11 accommodates teeth other than those mated with the composite module 40.

[0033] Further explanation of the first section 11 and the second section 12. Figure 1 and Figure 2The schematic diagram of reference numeral 30 is a structural schematic diagram of a composite model consistent with the patient's dentition and palatal tissue. In order to facilitate the demonstration of the morphology of the retaining crowns after they are attached to the teeth, this composite model 30 is used to illustrate the patient's actual dentition and palatal tissue, in conjunction with the palatal bar 20 of this application for explanation (not considering that the patient has an 8th tooth). The retaining crowns 21 on the left and right sides respectively correspond to the 5th to 7th teeth of the patient's posterior teeth area. The retaining crowns 21 attached to the 5th to 7th teeth of the posterior teeth area form a composite module 40. The second section 12 is provided with a receiving cavity to accommodate the composite module 40, and the first section 11 accommodates the 1st to 4th teeth of the patient on the left and right sides.

[0034] In another embodiment, please refer to Figure 4 As shown, the retention crowns 21 on the left and right sides correspond to teeth 5 and 6 in the posterior region of the patient, respectively. The retention crowns 21 and teeth 5 and 6 in the posterior region form a composite module 40. The second section 12 is provided with a receiving cavity to accommodate the composite module 40. The first section 11 accommodates teeth 1 to 4 and teeth 7 on the left and right sides of the patient.

[0035] In another embodiment, the left and right retaining crowns 21 are respectively matched with the patient's posterior tooth number 6. The retaining crowns 21 and the posterior tooth number 6 form a composite module 40. The second section 12 is provided with a receiving cavity to accommodate the composite module 40. The first section 11 accommodates the patient's left and right teeth number 1-5 and tooth number 7.

[0036] Continuing the explanation, the buccal and / or lingual sides of the retaining crown 21 are further provided with retaining attachments 23, and a matching portion 13 corresponding to the retaining attachment 23 is further provided in the second section 12 at a position corresponding to the retaining attachment 23. In one embodiment, please refer to... Figures 1 to 3 As shown, the retaining attachment 23 is disposed on the cheek side of the retaining crown 21. The retaining attachment 23 protrudes in a direction away from the retaining crown 21. The second section 12, corresponding to the position of the retaining attachment 23, also has a matching part 13 that matches the retaining attachment 23. Specifically, the matching part 13 is a groove structure capable of enclosing the retaining attachment 23. For example, it can be formed by the cheek-side surface of the second section 12 being recessed in the cheek-side direction. The matching of the matching part 13 with the retaining attachment 23 enhances the retention effect of the shell-like body 10 and avoids the risk of detachment. In another embodiment, please refer to... Figure 4 As shown, the retaining attachment 23 can also be disposed on the tongue side of the retaining crown 21. In another embodiment, please refer to... Figure 5 As shown, the retention attachment 23 can also be simultaneously disposed on the buccal and lingual sides of the retention crown 21. It should be noted that... Figures 1 to 5 The shown retention attachments 23 are multiple, but the scope of protection of this application is not limited to the case where there are multiple retention attachments 23. It is sufficient to set one retention attachment 23 in a dental instrument.

[0037] Further explanation: The retention crown 21 includes at least one clasp that wraps around the side of the tooth. This clasp structure circumferentially wraps around the side of the tooth, enhancing the fixation effect of the retention crown 21 on the tooth side. It securely wraps the tooth, preventing loosening or dislodgement during use, and improving the stability of the dental instrument 100 during wear. Moreover, the circumferential clasp structure disperses stress, reducing damage to the tooth surface. Specifically, the clasp wraps around at least one of 1-4 teeth in the posterior region. The number of teeth wrapped by the retention crown 21 can be set according to actual needs. For example, when strong anchorage is required, the retention crown 21 can be set to wrap around more teeth; alternatively, the retention crown 21 can be set for teeth with smaller crowns in the patient's posterior region, thereby improving the wearing stability of the posterior teeth and the shell-like body 10. Please refer to [reference needed]. Figure 3 As shown, the retention crown 21 includes three clasps that wrap around the sides of the teeth. These clasps wrap around three teeth in the posterior region (e.g., teeth 5-7). In this case, the palatal bar 20 binds six teeth (teeth 5-7) together on both sides of the posterior region, providing strong anchorage. In another embodiment, the retention crown 21 may also include one clasp, wrapping around one tooth in the corresponding position, such as tooth 6. In yet another embodiment, the retention crown 21 may also include two clasps, wrapping around two teeth in the corresponding position, such as teeth 5-6. In other embodiments, the retention crown 21 may also include four clasps, wrapping around four teeth in the corresponding position, such as teeth 4-7.

[0038] Further explanation: the retaining crown 21 also includes an occlusal portion 24 that at least partially covers the occlusal surface of the tooth, the shape of which matches the shape of the occlusal surface of the covered tooth. This configuration, on the one hand, makes the fit more stable through shape matching; for example, the concave-convex structure of the occlusal portion 24 facing the tooth matches the cusp and fossa of the tooth, achieving a concave-convex match. On the other hand, it further increases the contact area between the retaining crown 21 and the tooth, further enhancing the stability of their fit. For example, in one embodiment, the retaining crown 21 is bonded to the tooth by adhesive bonding. The occlusal portion 24 in this application increases the bonding area between the inner surface of the retaining crown 21 facing the tooth and the tooth, thereby improving bonding stability.

[0039] Furthermore, the occlusal portion 24 is provided with a through hole 25 at the corresponding tooth cusp for the tooth cusp to pass through. This through hole 25 design allows the occlusal portion 24 of the retention crown 21 and the tooth cusp to form a mechanical restraint, reducing movement between the retention crown 21 and the tooth. After mating, the retention effect of the retention crown 21 and the tooth is excellent. Simultaneously, the mechanical pairing of the through hole 25 and the tooth cusp also serves as a guide and positioner during mating, facilitating installation. Moreover, especially when using adhesive, the through hole 25 facilitates the overflow of adhesive from the through hole 25, promoting adhesive flow and even distribution. This prevents excessive thickness or uneven thickness on the occlusal side of the occlusal portion 24 facing the tooth due to adhesive accumulation, which could affect the mating stability of the retention crown 21.

[0040] For further explanation, please refer to Figure 6 and Figure 7 As shown, the surface of the retention attachment 23 near the gingiva is curved. Curving the surface S1 of the retention attachment 23 near the gingiva increases the contact area between the retention attachment 23 and the corresponding position of the second segment 12, thereby improving the retention effect. It should be noted that the scope of protection of this application does not limit the shape of the retention attachment 23. For example, the retention attachment 23 can be a traditional rectangular attachment; it can also be a cartoon pattern, especially in the field of pediatric orthodontics, where cartoon patterns that children like can be selected, making it more appealing to children; or it can be the logo or text of the manufacturer of the dental instrument 100 or dental clinic, such as a trademark; the shape selection of the retention attachment 23 is flexible; or, in another embodiment, the retention attachment 23 can also be an attachment... Figure 5 The irregularly shaped attachment shown includes a first outer surface S2 and a second outer surface S3. Both the first outer surface S2 and the second outer surface S3 are curved surfaces with the same curvature direction. After being disposed on the side surface of the retention crown 21, the first outer surface S2 is disposed towards the gingiva. The inner contour shape of the matching part 13 on the second segment 12 is consistent with the outer contour of the irregularly shaped attachment. When the matching part 13 is used in conjunction with the irregularly shaped attachment, it can provide a larger contact area, and therefore can provide a greater retention force.

[0041] Furthermore, the buccal and / or lingual sides of the retention crown 21 are also provided with functional attachments 26. The second section 12 has a clearance structure or through-hole structure corresponding to the position of the functional attachment 26. The functional attachment 26 is one of a traction device, bracket, buccal tube, or sleeve. Thus, by adding the functional attachment 26, different treatment needs can be met, and the clearance structure or through-hole structure on the second section 12 provides sufficient space for the functional attachment 26, thereby avoiding interference between the functional attachment 26 and the shell-like body 10, and improving the flexibility and practicality of the dental instrument 100.

[0042] Specifically, in one embodiment, such as Figure 8 As shown, the functional accessory 26 is a traction buckle. The second section 12 has a through-hole structure at its corresponding position for the traction buckle to pass through. After the traction buckle passes through the through-hole structure, one end of an orthodontic traction member 60 (such as an orthodontic elastic band) is attached to the traction buckle. The other end of the orthodontic traction member 60 is attached to another traction buckle 50 located in the first section 11. For example, in a scenario where the gap needs to be closed after extraction of tooth #4, this can be configured to close the extraction gap using traction force. In another embodiment, the functional accessory 26 can also be a bracket, buccal tube, or sleeve. These functional accessories 26 are used to fix archwires, etc. The second section 12 has a through-hole structure at its corresponding position for the functional accessory 26 to pass through, or a clearance structure to avoid the functional accessory 26. For example, a clearance opening is provided at a corresponding position in the second section 12, with the clearance opening being an open structure near the gingiva, allowing the functional accessory 26 to pass through.

[0043] Further explanation of the palatal connecting rod 22: Both ends of the palatal connecting rod 22 are respectively connected to the lingual sides of the left and right retaining crowns 21. The palatal connecting rod 22 is arched towards the hard palate, and there is a gap between the side of the palatal connecting rod 22 facing the hard palate and the patient's hard palate in the vertical direction. The gap is greater than 0 and less than or equal to 10 mm. The arched shape of the palatal connecting rod 22 conforms to the anatomical structure of the hard palate, and this gap range is suitable for most patients, avoiding interference between the palatal connecting rod 22 and the tongue, thus improving the comfort of wearing the dental instrument 100. At the same time, maintaining a gap between the palatal connecting rod 22 and the hard palate ensures sufficient space for oral cleaning and saliva flow, while also preventing excessive pressure from the palatal connecting rod 22 on the hard palate, reducing the feeling of a foreign body. For example, in some implementations, the gap is set to 2mm, 5mm or 10mm respectively to accommodate the individual oral morphology of different patients, that is, the "arch" height of the palate is different for different patients, or it can be flexibly set according to the patient's preferences.

[0044] Furthermore, the palatal connecting rod 22 can be a single unit (e.g., Figure 4 (As shown), there can also be multiple, such as 2 (e.g.) Figures 1 to 3 (As shown) or 3, when multiple palatal connecting rods 22 are provided, the multiple palatal connecting rods 22 are arranged in parallel, or the distance between two adjacent palatal connecting rods 22 is equal, or the multiple palatal connecting rods 22 are arranged in parallel and the distance between two adjacent palatal connecting rods 22 is equal. This arrangement can enhance the balance and stability of the overall structure of the dental instrument 100, prevent the palatal bar from flipping, and can evenly distribute the corrective force, avoid local stress concentration, and improve the predictability of the correction effect.

[0045] Further explanation: the palatal connecting rod 22 is provided with a first traction hook 27 for hooking the traction member, and a second traction hook 28 is provided on the lingual side of the anterior teeth region of the first section 11. The traction member is hooked onto the first traction hook 27 and the second traction hook 28 to apply traction force to the teeth in the anterior teeth region. In one embodiment, please refer to... Figure 9 As shown, there are two first traction hooks 27, each disposed on a palatal connecting rod 22 near the anterior teeth. Corresponding to the two first traction hooks 27, two second traction hooks 28 are disposed on the lingual side of the first section 11. An orthodontic traction element 60 (such as an orthodontic rubber band) is attached between each of the corresponding first traction hooks 27 and second traction hooks 28, forming two sets of traction components to achieve precise traction of the anterior teeth, adjust the dental arch shape, promote the improvement of the overall occlusal relationship, and thus improve the orthodontic efficiency. In another embodiment, there can be one first traction hook 27 and one palatal connecting rod 22. The first traction hook 27 is disposed on the palatal connecting rod 22. Corresponding to the first traction hook 27, a second traction hook 28 is disposed on the lingual side of the first section 11. An orthodontic traction element 60 (such as an orthodontic rubber band) is attached between each of the first traction hook 27 and the second traction hook 28, forming a set of traction components for traction of the anterior teeth. It is understood that, in another embodiment, the first traction hook 27 may also be provided in three or four, and may be provided on one or more palatal connecting rods 22. That is, the number and position of the first traction hook 27 can be set according to the required traction target.

[0046] Further explanation: In this application, the retention attachment 23 and the retention crown 21 can be integrally formed, or the retention crown 21 and the palatal connecting rod 22 can be integrally formed; or, the attachment, the retention crown 21, and the palatal connecting rod 22 can all be integrally formed. Such an integrally formed design can improve the structural strength and precision between connected structures, reduce micro-movements between structures, extend service life, and ensure stable connection. Clinically, the palatal bar 20 can be manufactured using casting or 3D printing processes; 3D printing technology allows for personalized customization of complex structures, making it easier to meet diverse clinical needs. In clinical applications, the palatal bar can be made of metal materials (such as stainless steel) through casting; or it can be directly printed using 3D printing materials.

[0047] 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.

[0048] 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.

[0049] 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 scope of the technology 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, The device includes a shell-like body and a palatal bar for fitting into the posterior teeth region of a patient. The palatal bar includes two retention crowns for fitting into the left and right posterior teeth regions and a plurality of palatal connecting rods connecting the two retention crowns. The inner contours of the left and right retention crowns match the outer contours of the teeth at the corresponding positions on the patient's teeth. The posterior teeth, after fitting the retention crowns, form a composite module. The shell-like body includes a first segment and a second segment for accommodating the composite module. The first segment accommodates teeth other than those fitting into the composite module, and the inner contour shape of the cavity in the second segment matches the outer contour shape of the composite module. Retention attachments are provided on the buccal and / or lingual sides of the retention crowns, and the second segment has a matching portion corresponding to the position of the retention attachments.

2. The dental instrument according to claim 1, characterized in that, The retention crown includes at least one clasp that wraps around the side of a tooth, wherein the clasp wraps around at least one of 1-4 teeth in the posterior region.

3. The dental instrument according to claim 2, characterized in that, The retaining crown also includes at least a portion of the occlusal surface of the tooth, the shape of which is consistent with the shape of the occlusal surface of the tooth being covered.

4. The dental instrument according to claim 3, characterized in that, The biting part has a through hole at the corresponding tooth tip for the tooth tip to pass through.

5. The dental instrument according to claim 1, characterized in that, The surface of the retention attachment near the gum line is a concave curved surface that moves away from the gum line.

6. The dental instrument according to claim 1, characterized in that, The buccal and / or lingual sides of the fixed crown are also provided with functional accessories, and the second section is provided with a clearance structure or a through hole structure at the position corresponding to the functional accessories. The functional accessories are one of a traction device, a bracket, a buccal tube, or a sleeve.

7. The dental instrument according to claim 1, characterized in that, When there are multiple palatal connecting rods, the multiple palatal connecting rods are arranged in parallel, and / or the distance between two adjacent palatal connecting rods is equal.

8. The dental instrument according to claim 1, characterized in that, The two ends of the palatal connecting rod are respectively connected to the lingual side of the fixation crown on the left and right sides. The palatal connecting rod is arched in the direction of the hard palate. The side of the palatal connecting rod facing the hard palate and the patient's hard palate are separated by a gap in the vertical direction. The gap is greater than 0 and less than or equal to 10 mm.

9. The dental instrument according to claim 1, characterized in that, The palatal connecting rod is provided with a first traction hook for hooking the traction component, and a second traction hook is provided on the lingual side of the anterior tooth region of the first section. The traction component is hooked on the first traction hook and the second traction hook to apply traction force to the teeth in the anterior tooth region.

10. The dental instrument according to claim 1, characterized in that, The palatal bar is manufactured by casting or 3D printing; the retention attachment and the retention crown are integrally formed, and / or the retention crown and the palatal connecting rod are integrally formed.

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