Dental instrument

Abstract

The utility model discloses dental instrument, including shell body and the tooth arch part of the upper jaw posterior tooth area of being connected, tooth arch part is integral structure, including first connecting part, second connecting part and tooth arch body, the left and right ends of tooth arch body are connected in the lingual side of first connecting part and the lingual side of second connecting part respectively, shell body has the geometric structure of moving the tooth of being wrapped in tooth from first position to second position, shell body includes the first section of accommodating first connecting part and the second section of accommodating second connecting part and the third section of wrapping the tooth of not being connected by first connecting part and second connecting part, first connecting part is accommodated and fixed in the first section, and the inner surface of first section corresponds to the position of first connecting part at the outer surface of first connecting part and is attached, second connecting part is accommodated and fixed in the second section, and the inner surface of second section corresponds to the position of second connecting part at the outer surface of second connecting part and is attached.

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] Crowded teeth are a common clinical presentation among orthodontists. While current treatment plans often involve creating space through extractions, interproximal enamel reduction, and pushing molars distally or labially, some patients experience crowding primarily due to insufficient arch width. Opening the arch can alleviate this crowding; therefore, arch expansion is a common treatment for arch misalignment. Traditional expansion methods include fixed expanders, four-eye spring expanders, scissor expanders, implant-assisted expanders, and surgical expanders. However, these methods are mostly used in fixed orthodontic treatments, which can cause significant damage to the patient's oral cavity and result in a poor patient experience and comfort.

[0003] With the development of invisible braces, they are increasingly chosen by many due to their comfortable wear, removability, and aesthetic appeal. While invisible braces correct teeth, they also have a partial arch expansion effect, but the expansion force is relatively small, resulting in poor expansion effectiveness. Existing technologies have also developed methods that combine traditional arch expansion devices with invisible braces to improve the orthodontic effect while maximizing patient comfort. For example, Chinese patent CN202221672340.5 discloses a dental instrument that combines a traditional arch expansion device with an invisible braces. Utilizing an elastic transmission part and a force application device, it addresses to some extent the discomfort and poor effectiveness of traditional arch expansion devices. However, because its force application device is still primarily based on a traditional arch expansion device, it still causes considerable inconvenience to patients during force application; furthermore, the force application device is relatively large, resulting in a significant foreign body sensation, and thus, there are still some shortcomings in terms of comfort.

[0004] Therefore, it is of great significance to study a dental instrument that is comfortable to wear and can effectively expand the arch and correct teeth without affecting the orthodontic function of the clear aligner itself. 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 that can precisely adjust the width of the maxillary dental arch, improve patient comfort, and move teeth at the same time, thus meeting the complementary treatment needs of invisible orthodontic tooth movement and arch expansion.

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

[0007] A dental instrument includes: a shell-like body for receiving a patient's maxillary teeth and an arch portion fitted into the patient's maxillary posterior tooth region for adjusting the width of the maxillary dental arch;

[0008] The dental arch is an integral structure, including a first mating part that mates with the teeth in the left posterior region, a second mating part that mates with the teeth in the right posterior region, and a dental arch body connecting the first mating part and the second mating part; the left and right ends of the dental arch body are respectively connected to the lingual side of the first mating part and the lingual side of the second mating part.

[0009] The shell-like body has a geometry that moves a movable tooth in the enclosed tooth from a first position to a second position; the shell-like body includes a first section that accommodates the first mating part and a second section that accommodates the second mating part, as well as a third section that encloses a tooth not mated by the first mating part and the second mating part.

[0010] The first mating part is accommodated and fixed within the first section, and the outer surface of the first mating part and the inner surface of the first section corresponding to the position of the first mating part are in contact with each other; the second mating part is accommodated and fixed within the second section, and the outer surface of the second mating part and the inner surface of the second section corresponding to the position of the second mating part are in contact with each other.

[0011] This application, through the design of attaching an arch portion to a shell-shaped body, allows the shell-shaped body and the arch portion to be assembled separately after fabrication. On one hand, the integrated structure of the arch portion not only improves its stability and durability, ensuring it is not easily deformed or damaged during treatment, but also, compared to traditional arch expanders, allows for the application of horizontal arch-expanding force to the posterior teeth corresponding to the first and second attachment portions through its own elastic deformation, thereby adjusting the width of the maxillary arch. This improves operational convenience and increases patient acceptance. Furthermore, the shell-shaped body, attached to the outside of the arch portion, can fully consider patient comfort while meeting orthodontic needs, without being limited by the rigidity requirements of the arch expander, greatly enhancing patient comfort. On the other hand, arch expansion and tooth alignment can complement each other, improving treatment efficiency and shortening the treatment cycle. The adjusted maxillary arch width of the arch portion can provide space for the shell-shaped body to move teeth within it from a first position to a second position. Such a dental instrument can shorten the entire treatment cycle for arch expansion and tooth movement.

[0012] Preferably, the first and second mating portions cover only the lingual surfaces of the teeth in the left and right posterior tooth regions, respectively; the first section covers the outer surface of the first mating portion and the surface of the tooth to which the first mating portion is mated, excluding the lingual surface; the second section covers the outer surface of the second mating portion and the surface of the tooth to which the second mating portion is mated, excluding the lingual surface. This arrangement reduces the area of ​​mating between the dental arch and the teeth to a certain extent, thereby further improving patient comfort.

[0013] Preferably, the first mating portion and the second mating portion further cover the buccal surfaces of the teeth in the left and right posterior tooth regions, respectively; the first section covers the outer surface of the first mating portion and the surfaces of the teeth to which the first mating portion is mated, excluding the lingual and buccal surfaces; the second section covers the outer surface of the second mating portion and the surfaces of the posterior tooth regions covered by the second mating portion, excluding the lingual and buccal surfaces. This arrangement increases the mating area between the first mating portion, the second mating portion, and the corresponding teeth, thereby increasing the retention force between them and the teeth.

[0014] Preferably, the first mating portion and the second mating portion respectively cover all surfaces of the teeth in the left and right posterior tooth regions, the first section wraps around the outer surface of the first mating portion, and the second section wraps around the outer surface of the second mating portion. By mating the first mating portion, the second mating portion, and all surfaces of the teeth at corresponding positions, the mating area is expanded, the retention force is increased, and the arch expansion force can be transmitted to a greater extent, which is beneficial to the arch expansion effect.

[0015] Preferably, when the first and second mating portions respectively cover all surfaces of the teeth in the left and right posterior tooth regions, the first mating portion includes a first occlusal portion covering the occlusal surface of the teeth, and a first preset height in the vertical direction between the distal surface of the first occlusal portion and the occlusal surface of the teeth covered by the first mating portion is used to adjust the vertical occlusal distance of the patient's upper and lower jaws. The second mating portion includes a second occlusal portion covering the occlusal surface of the teeth, and a second preset height in the vertical occlusal distance between the distal surface of the second occlusal portion and the occlusal surface of the teeth covered by it is used to adjust the vertical occlusal distance of the patient's upper and lower jaws. By setting preset heights (first / second preset heights) on the occlusal surfaces of the mating portions (first / second mating portions), a vertical gap is formed between the occlusal surfaces of the teeth and the dental instruments to open the bite, avoid premature contact of the posterior teeth during arch expansion, and prevent jaw interference.

[0016] Preferably, the outer surface of the first mating portion is provided with a first retaining portion that is fixed to the first segment, and the inner surface of the first segment corresponding to the position of the first retaining portion is provided with a first matching portion that matches the first retaining portion; the first retaining portion is a retaining attachment provided on the outer surface of the first mating portion, or the first retaining portion is formed by a portion of the outer surface of the first mating portion protruding outward or concave inward; wherein, the first mating portion and the first segment are fixedly connected by the concave-convex fit between the first retaining portion and the first matching portion; and the outer surface of the first mating portion is at least one of the lingual surface, buccal surface, and occlusal surface of the first mating portion;

[0017] And / or,

[0018] The outer surface of the second mating part is provided with a second retention part that is fixed to the second section. The inner surface of the second section corresponding to the position of the second retention part is provided with a second matching part that matches the second retention part. The second retention part is a retention attachment provided on the outer surface of the second mating part, or the second retention part is formed by a portion of the outer surface of the second mating part that is convex or concave. The second mating part and the second section are fixedly connected by the convex-concave fit between the second retention part and the second matching part. The outer surface of the second mating part is at least one of the lingual surface, buccal surface, and occlusal surface of the second mating part. By providing a retention attachment (protrusion / groove) on the mating part (first / second mating part) and a matching structure on the shell-shaped body, the retention force between the mating part and the shell-shaped body can be increased, the connection reliability of the dental instrument can be enhanced, and the risk of dislocation can be reduced.

[0019] Preferably, the outer surface of the first mating part is provided with a hollow structure, the inner surface of the first section corresponding to the position of the hollow structure passes through the hollow structure and wraps around the corresponding tooth surface; and the outer surface of the first mating part is at least one of the lingual side, buccal side, and occlusal surface of the first mating part.

[0020] And / or,

[0021] The outer surface of the second mating part is provided with a hollow structure, and the inner surface of the second section corresponding to the position of the hollow structure passes through the hollow structure and wraps around the tooth surface; and the outer surface of the second mating part is at least one of the lingual surface, buccal surface, and occlusal surface of the second mating part. This configuration can form a "rivet effect", which can increase the retention force between the mating part and the shell-like body, enhance the connection reliability of the dental instrument, and reduce the risk of dislocation.

[0022] Preferably, the outer surface of the first mating part and the inner surface of the first section are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking, and / or the outer surface of the second mating part and the inner surface of the second section are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking; so that the toothed portion is fixedly connected to the shell-shaped body. Such a fixed connection can eliminate fretting wear between the mating part and the shell-shaped body, and reduce the loss of the expanding force during transmission.

[0023] Preferably, the toothed portion is detachably and fixedly connected to the corresponding first segment and second segment and the shell-shaped body via the first mating portion and the second mating portion, respectively. This detachable connection facilitates the replacement of either the toothed portion or the shell-shaped body.

[0024] Preferably, the dental instrument includes multiple dental arch sections with different orthodontic forces in the horizontal direction. These dental arch sections with different orthodontic forces are applied to different orthodontic stages or different wearing cycles within the same orthodontic stage. This allows for timely replacement of dental arch sections with different orthodontic forces according to different orthodontic stages or different wearing cycles, providing convenience and flexibility.

[0025] Preferably, the first mating part and the second mating part are respectively mated to at least one of the 4th to 7th teeth in the left and right posterior tooth regions, and the dental arch body covers the mesiodistal length of the mated teeth from mesiodistal upward; wherein, the first mating part and the second mating part are symmetrically arranged along the palatal midline, or, the first mating part and the second mating part are arranged at the same tooth position on the left and right sides of the posterior tooth region.

[0026] Preferably, the dental arch body is arched towards the hard palate, and the surface of the dental arch body facing the hard palate is set at a preset distance from the patient's hard palate, wherein the preset distance is greater than 0 and less than or equal to 15 mm. This design avoids the dental arch from compressing the hard palate mucosa and allows for natural tongue movement, further improving patient comfort.

[0027] Preferably, the shell-like body further includes a first palatal device that mates with the dental arch body. The upper surface of the first palatal device facing the patient's palate has the same contour shape and curvature as the lower surface of the dental arch body away from the patient's palate. The first palatal device and the shell-like body are an integral structure. The upper surface of the first palatal device facing the patient's palate and the lower surface of the dental arch body away from the patient's palate are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking. Alternatively, the first palatal device is detachably connected to the dental arch body.

[0028] Preferably, the shell-shaped body has a geometric structure that applies a corrective force to at least one tooth in the posterior region, causing distalization of the posterior tooth. The shell-shaped body further includes a second palatal device connected to the lingual side of the shell-shaped body in the anterior region. When worn, the second palatal device abuts against the patient's anterior palate, and the surface of the second palatal device facing the anterior palate is adapted to the surface shape of the anterior palate to resist the reaction force of the corrective force causing distalization of the posterior tooth. The second palatal device and the shell-shaped body are an integral structure. This configuration allows the reaction force of distalization of the posterior tooth to be transmitted to the anterior palate, reducing the reaction force transmitted to the teeth in the anterior region, thereby preventing or reducing the degree of labial inclination of the anterior teeth.

[0029] Preferably, the second palatal device includes an anchor body and a blocking hole. The blocking hole is disposed between the anterior tooth region of the shell-shaped body and the anchor body, and is used to block the reaction force of the orthodontic force that pushes the posterior teeth distally from acting on the anterior teeth. By setting the blocking hole, the transmission of the reaction force to the anterior teeth can be blocked, further protecting the positional stability of the anterior teeth and thus avoiding labial tipping of the anterior teeth.

[0030] Preferably, the rigidity of the dental arch portion is greater than the rigidity of the shell-shaped body; wherein the dental arch portion and the shell-shaped body differ at least in their manufacturing materials or thicknesses. The high rigidity of the dental arch portion allows the force generated by its elastic deformation to meet the requirements for arch expansion, while the low rigidity of the shell-shaped body allows it to adapt to the elastic deformation required for tooth movement, thus meeting the patient's needs for tooth movement and comfort. Attached Figure Description

[0031] 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.

[0032] Figure 1 This is a schematic diagram of the structure of a dental instrument according to Embodiment 1 of this utility model;

[0033] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;

[0034] Figure 3 This is a schematic diagram of the structure of a dental instrument with a retention part in Embodiment 1 of this utility model;

[0035] Figure 4 This is an assembly diagram of another dental instrument in Embodiment 1 of this utility model;

[0036] Figure 5This is a schematic diagram of the structure of a dental instrument with a first palatal device according to Embodiment 2 of this utility model;

[0037] Figure 6 This is a top view schematic diagram of a dental instrument equipped with a second palatal device according to Embodiment 2 of this utility model;

[0038] Figure 7 This is a schematic diagram of another dental instrument with a second palatal device in Embodiment 2 of this utility model;

[0039] Figure 8 This is a schematic diagram of the structure of a tooth arch portion in Embodiment 3 of this utility model;

[0040] Figure 9 This is a schematic diagram of the structure of a tooth arch portion in Embodiment 4 of this utility model;

[0041] Figure 10 This is a partial cross-sectional schematic diagram of the tooth arch portion with a first biting portion in Embodiment 4 of this utility model;

[0042] Figure 11 This is a partial cross-sectional schematic diagram of a dental instrument with a hollow structure according to Embodiment 5 of this utility model;

[0043] Figure 12 This is a partial cross-sectional schematic diagram of another dental instrument with a hollow structure in Embodiment 5 of this utility model. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The following will provide a detailed explanation in conjunction with the illustrations.

[0048] Example 1

[0049] Please refer to Figure 1 and Figure 2 As shown, this application discloses a dental instrument 100, including a shell-like body 10 for accommodating a patient's maxillary teeth and an arch portion 20 fitted to the patient's maxillary posterior teeth region for adjusting the width of the maxillary dental arch. The arch portion 20 is an integral structure, including a first fitting portion 21 that fits with teeth in the left posterior teeth region, a second fitting portion 22 that fits with teeth in the right posterior teeth region, and an arch body 23 connecting the first fitting portion 21 and the second fitting portion 22. The left and right ends of the arch body 23 are respectively connected to the lingual side of the first fitting portion 21 and the lingual side of the second fitting portion 22. The rigidity of the arch portion 20 is sufficient to apply a horizontal orthodontic force to the posterior teeth corresponding to the first fitting portion 21 and the second fitting portion 22 through elastic deformation, thereby adjusting the width of the maxillary dental arch. It should be noted that the dental arch portion 20 described in this application can be used to expand or shrink the arch. The first mating portion 21 and the second mating portion 22 at least include a surface adjacent to the lingual side. This surface on the lingual side can conform to the shape of the lingual surface of the tooth at the corresponding position, for example, it can just cover the lingual surface of the tooth at the corresponding position; or it can be a connecting component used only to connect the dental arch body 23. In this case, the surface on the lingual side may not conform to the shape of the lingual surface of the tooth at the corresponding position, and it only serves a connecting function.

[0050] Further explanation of the shell-shaped body 10: The shell-shaped body 10 has a geometric structure for moving a tooth within the enclosed teeth from a first position to a second position. This shell-shaped body 10 has the function of moving teeth. Clinically, a dental model of the patient is typically obtained first, and then a tooth model at the second position is designed based on the amount of movement required from the first position to the second position. The shell-shaped body 10 matches the tooth model at the second position. When the patient wears the shell-shaped body 10, the shell-shaped body 10 moves the tooth through elastic deformation. It should be noted that the first position can be the initial position of the tooth to be moved in the patient's teeth, or the current position of the tooth to be moved at the beginning of a certain orthodontic stage; the second position can be the final target position of the tooth to be moved in the patient's teeth, or the position to which the tooth to be moved is to at the end of a certain orthodontic stage. Specifically, the shell-like body 10 includes a first section 11 that accommodates the first mating part 21, a second section 12 that accommodates the second mating part 22, and a third section 13 that wraps around teeth that are not mated by the first mating part 21 and the second mating part 22.

[0051] Before wearing, the dental arch portion 20 and the shell-shaped body 10 are assembled to obtain the dental instrument 100 of this application, that is, the first mating portion 21 is accommodated and fixed in the first section 11, and the outer surface of the first mating portion 21 and the inner surface of the first section 11 corresponding to the position of the first mating portion 21 are fitted together; and the second mating portion 22 is accommodated and fixed in the second section 12, and the outer surface of the second mating portion 22 and the inner surface of the second section 12 corresponding to the position of the second mating portion 22 are fitted together; after assembly, the entire dental instrument 100 is worn in the mouth.

[0052] This application, through the design of attaching the dental arch portion 20 to the shell-shaped body 10, allows for separate attachment after design. Firstly, the integrated structure of the dental arch portion 20 not only improves its stability and durability, ensuring it is not easily deformed or damaged during treatment, but also, in terms of force application, compared to traditional arch expanders, the dental arch portion 20 in this application can apply a horizontal expanding force to the posterior teeth corresponding to the first attachment portion 21 and the second attachment portion 22 through its own elastic deformation to adjust the width of the maxillary dental arch. This improves operational convenience and increases patient acceptance. Furthermore, the shell-shaped body attached to the outside of the dental arch portion 20... While meeting the requirements of orthodontic treatment, the device 100 can fully consider the patient's wearing comfort, without being limited by the rigidity requirements of arch expansion, thus greatly improving the patient's comfort. On the other hand, arch expansion and tooth movement can complement each other, improving treatment efficiency and shortening the treatment cycle. The width of the maxillary arch adjusted by the dental arch portion 20 can provide movement space for the moving teeth within the shell-like body 10 to move from a first position to a second position. Since the teeth are moved in real time, there is no resistance to arch expansion, which promotes the completion of arch expansion. Such a dental instrument 100 can shorten the entire treatment cycle of arch expansion and tooth movement.

[0053] To further explain, in this embodiment, the first mating part 21 covers the buccal and lingual surfaces of the teeth in the left posterior tooth region, and the second mating part 22 covers the buccal and lingual surfaces of the teeth in the right posterior tooth region. This arrangement allows the first mating part 21, the second mating part 22, and the buccal and lingual surfaces of the corresponding teeth to be mated in a wrapping manner, ensuring the mating area and increasing the retention force with the teeth.

[0054] The first mating portion 21 includes an inner surface adjacent to the tooth and an outer surface away from the tooth. The inner surface of the first mating portion 21 corresponds to the lingual surface contour of the tooth it encloses and is consistent with the lingual surface contour of the tooth. The inner surface of the first mating portion 21 corresponds to the buccal surface contour of the tooth it encloses and is consistent with the buccal surface contour of the tooth. The first section 11 encloses the outer surface of the first mating portion 21 and the surfaces of the tooth to which the first mating portion 21 is mated, excluding the lingual and buccal surfaces, i.e., the occlusal surface and the mesial and distal surfaces of the tooth.

[0055] The second mating portion 22 includes an inner surface adjacent to the tooth and an outer surface away from the tooth. The inner surface of the second mating portion 22 corresponds to the lingual surface contour shape of the tooth it encloses and is consistent with the lingual surface contour shape of the tooth. The inner surface of the second mating portion 22 corresponds to the buccal surface contour shape of the tooth it encloses and is consistent with the buccal surface contour shape of the tooth. The second section 12 encloses the outer surface of the second mating portion 22 and the surfaces of the posterior teeth enclosed by the second mating portion 22, excluding the lingual and buccal surfaces, i.e., the occlusal surface and the mesial and distal surfaces of the tooth.

[0056] For further explanation, please refer to [link / reference]. Figure 3 As shown, in order to increase the retaining force between the first mating part 21 and the second mating part 22 and the shell-shaped body 10, this application provides a first retaining part 212 that is fixed to the first section 11 on the outer surface of the first mating part 21, and a first matching part 112 that matches the first retaining part 212 on the inner surface of the first section 11 at the position corresponding to the first retaining part 212; and a second retaining part 222 that is fixed to the second section 12 on the outer surface of the second mating part 22, and a second matching part 122 that matches the second retaining part 222 on the inner surface of the second section 12 at the position corresponding to the second retaining part 222. With the above configuration, the dental instrument 100, through the cooperation of the first retention part 212 and the first mating part 112 and the cooperation of the second retention part 222 and the second mating part 122, increases the retention force between the first mating part 21 / the second mating part 22 and the shell body 10, thereby enhancing the overall connection reliability of the dental instrument 100 and reducing the risk of dislocation.

[0057] Continuing the explanation, the first retaining part 212 is a retaining attachment disposed on the outer surface of the first mating part 21. The outer surface of the first mating part 21 can be the tongue side or the cheek side of the first mating part 21. In this embodiment, both the tongue side and the cheek side of the first mating part 21 are provided with retaining attachments. The retaining attachments can be manufactured separately and then installed on the first mating part 21 by means of bonding, welding or other methods.

[0058] In other embodiments, the first retention portion 212 may also be formed by a portion of the surface of the first mating portion 21 that is concave or convex. Specifically, the first retention portion 212 may be formed by a portion of the lingual surface of the first mating portion 21 that is concave towards the proximal tooth, or by a portion of the lingual surface of the first mating portion 21 that is convex towards the distal tooth; the first retention portion 212 may also be formed by a portion of the buccal surface of the first mating portion 21 that is concave towards the proximal tooth, or by a portion of the buccal surface of the first mating portion 21 that is convex towards the distal tooth. This application does not impose any limitations on this.

[0059] Continuing the explanation, the second retaining part 222 is a retaining attachment disposed on the outer surface of the second mating part 22. The outer surface of the second mating part 22 can be the tongue side or the cheek side of the second mating part 22. In this embodiment, both the tongue side and the cheek side of the second mating part 22 are provided with retaining attachments. The retaining attachments can be manufactured separately and then installed on the second mating part 22 by means of bonding, welding or other methods.

[0060] In other embodiments, the second retention portion 222 may also be formed by a portion of the surface of the second mating portion 22 that is concave or convex. Specifically, the second retention portion 222 may be formed by a portion of the lingual surface of the second mating portion 22 that is concave towards the proximal tooth, or by a portion of the lingual surface of the second mating portion 22 that is convex towards the distal tooth; the second retention portion 222 may also be formed by a portion of the buccal surface of the second mating portion 22 that is concave towards the proximal tooth, or by a portion of the buccal surface of the second mating portion 22 that is convex towards the distal tooth. This application does not impose any limitations on this.

[0061] Of course, it is understandable that, in terms of increasing the retention effect, it is better to provide a first retention part 212 on the first mating part 21 and a second retention part 222 on the second mating part 22. However, this application does not exclude the possibility of providing a first retention part 212 only on the first mating part 21, or providing a second retention part 222 only on the second mating part 22. These technical solutions are also within the scope of protection of this application. As for the setting method and setting position of the first retention part 212 and the second retention part 222, they are the same as described above and will not be repeated here.

[0062] Please continue reading for further explanation. Figure 3As shown, the first mating part 21 mates with teeth 5-7 in the left posterior region, and the dental arch body 23 covers the mesiodistal length of the mated teeth from mesiodistal upward. The second mating part 22 mates with teeth 5-7 in the right posterior region, and the dental arch body 23 covers the mesiodistal length of the mated teeth from mesiodistal upward. Both the first mating part 21 and the second mating part 22 are positioned at the same tooth position on both sides of the posterior region. When there are missing teeth on both sides, the first mating part 21 and the second mating part 22 can also be symmetrically positioned along the palatal midline. By mating multiple teeth, the first mating part 21 and the second mating part 22 increase the mating area between the dental arch 20 and the teeth, thus increasing the mating stability. At the same time, the first mating part 21 and the second mating part 22 are positioned at the same tooth position on both sides of the posterior region, or symmetrically positioned along the palatal midline (e.g., Figure 1 As shown in the diagram, this ensures a relatively balanced expansion force on the left and right posterior tooth regions, preventing adverse consequences such as malocclusion when adjusting the width of the maxillary dental arch, and improving patient comfort. Of course, in other implementations, it can also be done as follows... Figure 1 As shown, both the first mating part 21 and the second mating part 22 are positioned to correspond to teeth 5-7 on both sides of the posterior dentition. The dental arch body 23 does not completely cover the mesiodistal length of teeth 5-7. This ensures stable mating while further reducing the feeling of a foreign object in the mouth, thus improving comfort. It is understood that the first mating part 21 and the second mating part 22 can also be positioned to correspond to one, two, or four teeth 4-7 in the posterior dentition on both sides.

[0063] To further explain, the dental arch body 23 is arched towards the palate, and the surface of the dental arch body 23 facing the palate is set at a preset distance from the patient's palate, wherein the preset distance is greater than 0 and less than or equal to 15 mm. By maintaining the preset distance between the dental arch body 23 and the patient's palate, the dental arch 20 can be prevented from compressing the palatal mucosa. Simultaneously, setting the preset distance between the dental arch body 23 and the patient's palate to less than or equal to 15 mm also provides a gap between the dental arch body and the tongue, thereby avoiding interference with the tongue and allowing for natural tongue movement, further improving patient comfort. In some embodiments, the preset distance is set to 1 mm, 10 mm, or 15 mm, respectively. Moreover, different patients have different oral cavity morphologies, and the "arch" height of the dental arch body 23 varies. By setting the preset distance within this range, it can accommodate most patients, improving the applicability of the dental instrument 100.

[0064] For further explanation, please refer to [link / reference]. Figure 4As shown, the shell-shaped body 10 may further include a first palatal device 14 that mates with the dental arch body 23. The upper surface of the first palatal device 14 facing the patient's palate has the same contour shape and curvature as the lower surface of the dental arch body 23 away from the patient's palate, to ensure a good fit between the first palatal device 14 and the dental arch body 23. In some embodiments, the first palatal device 14 and the shell-shaped body 10 can be an integral structure. When assembling the dental arch body 20 and the shell-shaped body 10, the upper surface of the first palatal device 14 facing the patient's palate and the lower surface of the dental arch body 23 away from the patient's palate are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking to ensure the assembly reliability of the shell-shaped body 10 and the dental arch body 23. In this embodiment, free radicals in the polymer materials of the first palatal device 14 and the dental arch body 23 are combined through radiation crosslinking, forming new chemical bonds between two adjacent molecular chains. This connects the originally linear or branched polymer chains, forming a three-dimensional network structure, which can enhance the mechanical strength and wear resistance of the connection. In other embodiments, the first palatal device 14 can also be detachably connected to the dental arch body 23. For example, a set of detachable convex-concave matching structures can be provided between the upper surface of the first palatal device 14 facing the patient's palate and the lower surface of the dental arch body 23 away from the patient's palate to achieve detachable connection and assembly.

[0065] To further explain the connection method between the shell-shaped body 10 and the toothed portion 20, after assembly, in order to further enhance the connection strength between the shell-shaped body 10 and the toothed portion 20, a fixed connection can be made between the outer surface of the first mating portion 21 and the inner surface of the first section 11 by means of bonding, laser welding, or radiation crosslinking; at the same time, a fixed connection can be made between the outer surface of the second mating portion 22 and the inner surface of the second section 12 by means of bonding, laser welding, or radiation crosslinking; so that the toothed portion 20 is fixedly connected to the shell-shaped body 10. It should be noted that in this application, the shell-shaped body 10 and the toothed arch portion 20 have already been structurally designed to ensure a secure fixation. Further fixing via bonding, laser welding, or radiation cross-linking is to further strengthen the connection. Therefore, this fixing connection can exist solely between the outer surface of the first mating portion 21 and the inner surface of the first segment 11, or solely between the outer surface of the second mating portion 22 and the inner surface of the second segment 12; both are permissible and within the scope of this application, and will not be elaborated further here. This fixing connection method further eliminates fretting wear between the mating portion and the shell-shaped body 10, reducing the loss of the expanding force during transmission.

[0066] In other embodiments, the toothed portion 20 can also be detachably and fixedly connected to the corresponding first segment 11 and second segment 12 via the first mating portion 21 and the second mating portion 22, respectively, and to the shell-shaped body 10. This detachable connection facilitates the replacement of either the toothed portion 20 or the shell-shaped body 10.

[0067] To further explain, when the dental arch portion 20 and the shell-shaped body 10 are detachably connected, the dental instrument 100 may include multiple dental arch portions 20 with different orthodontic forces in the horizontal direction. These dental arch portions 20 with different orthodontic forces are applied to different orthodontic stages or different wearing cycles. This allows for timely replacement of dental arch portions 20 with different orthodontic forces according to different orthodontic stages or wearing cycles, providing convenience and flexibility. For example, during the day, a dental arch portion 20 with a slightly lower orthodontic force in the horizontal direction can be worn, thus not affecting normal daily activities. At night, it can be replaced with a dental arch portion 20 with a higher orthodontic force in the horizontal direction for effective arch expansion at night.

[0068] To further explain, the rigidity of the dental arch portion 20 is greater than that of the shell-shaped body 10; wherein, the dental arch portion 20 and the shell-shaped body 10 differ at least in their materials or thickness. The high rigidity of the dental arch portion 20 allows the force generated by its elastic deformation to meet the requirements for arch expansion, while the low rigidity of the shell-shaped body 10 allows it to adapt to the elastic deformation required for tooth movement, thus meeting the patient's needs for tooth movement and comfort. In some embodiments, the material of the dental arch portion 20 can be selected to have a higher rigidity than that of the shell-shaped body 10, so that the rigidity of the dental arch portion 20 can meet the orthodontic force requirements for adjusting the width of the maxillary dental arch; the material of the shell-shaped body 10 primarily focuses on enabling tooth movement while also considering patient comfort. In other embodiments, the dental arch portion 20 can be made of the same material as the shell-shaped body 10, but its thickness can be increased, which can also meet the needs of the dental arch portion 20. Clinically, a flexible choice can be made according to the actual situation.

[0069] Example 2

[0070] To achieve the purpose of this invention, this application also provides a dental instrument 100, please refer to... Figures 5 to 7As shown. The difference from Embodiment 1 is that in this embodiment, the shell-shaped body 10 has a geometric structure that applies a corrective force to at least one tooth in the posterior region, thereby achieving the therapeutic purpose of distalizing the posterior tooth. In this case, when using an invisible orthodontic appliance for distalizing the posterior teeth, the reaction force generated by the tooth movement is borne in the anterior region, which can easily cause the anterior teeth to tilt labially, resulting in an undesirable orthodontic effect. Therefore, in this embodiment, the shell-shaped body 10 also includes a second palatal device 15 connected to the lingual side of the anterior region of the shell-shaped body 10.

[0071] When the shell-shaped body 10 is provided with the first palatal device 14 as described in Embodiment 1, specifically, please refer to... Figure 5 and Figure 6 As shown, the side of the second palatal device 15 facing the posterior teeth is connected to the side of the first palatal device 14 facing the anterior teeth. Furthermore, the second palatal device 15 and the first palatal device 14 are an integral structure.

[0072] When worn, the second palatal device 15 abuts against the anterior region of the patient's maxilla to resist the reaction force of the orthodontic force that causes distalization of the posterior teeth. The second palatal device 15 and the shell-like body 10 are an integral structure. This design allows the reaction force of distalization of the posterior teeth to be transmitted to the anterior region of the maxilla, reducing the reaction force transmitted to the anterior teeth, thereby preventing or reducing the degree of labial inclination of the anterior teeth. Furthermore, the surface of the second palatal device 15 facing the anterior region of the maxilla can be configured to conform to the surface shape of the anterior region of the maxilla, further improving patient comfort.

[0073] Further, please see Figure 7 As shown, the second palatal device 15 includes an anchorage body 151 and a blocking hole 152. The blocking hole 152 is disposed between the anterior tooth region of the shell-shaped body 10 and the anchorage body 151, and is used to block the reaction force of the orthodontic force for distalization of posterior teeth from acting on the anterior teeth. When distalization of posterior teeth is performed, the anchorage body and the anterior teeth are separated by the blocking hole 152, which can block the reaction force of the orthodontic force for distalization of posterior teeth from acting on the anterior teeth, thereby maintaining the relative position of the anterior teeth, reducing labial inclination of the anterior teeth, and preventing the anterior teeth from tilting labially.

[0074] Example 3

[0075] To achieve the purpose of this invention, this application also provides a dental instrument 100, please refer to... Figure 8As shown, the difference from Embodiment 1 is that in this embodiment, the first mating portion 21 and the second mating portion 22 only cover the lingual surfaces of the teeth 200 in the left and right posterior tooth regions, respectively, to apply an arch-expanding force to the teeth covered by the first mating portion 21 and the second mating portion 22 in the horizontal direction; the first section 11 covers the outer surface of the first mating portion 21 and the surface of the tooth 200 mated by the first mating portion 21, excluding the lingual surface, and the second section 12 covers the outer surface of the second mating portion 22 and the surface of the tooth 200 mated by the second mating portion 22, excluding the lingual surface. This arrangement reduces the mating area between the arch portion 20 and the teeth to a certain extent. Because the rigidity of the arch portion 20 is greater than that of the shell-shaped body 10, reducing the mating area between the arch portion 20 and the teeth further improves patient comfort.

[0076] Furthermore, the first mating portion 21 includes an inner surface adjacent to the tooth and an outer surface away from the tooth. The inner surface of the first mating portion 21 corresponds to the lingual surface contour shape of the tooth it encloses, which is consistent with the lingual contour shape of the tooth. The first section 11 encloses the outer surface of the first mating portion 21 and the surfaces of the tooth to which the first mating portion 21 is mated, excluding the lingual surface, namely the buccal surface, occlusal surface, and mesial and distal surfaces of the tooth.

[0077] The second mating portion 22 includes an inner surface adjacent to the tooth and an outer surface away from the tooth. The inner surface of the second mating portion 22 corresponds to the lingual surface contour shape of the tooth it encloses, which is consistent with the lingual contour shape of the tooth. The second section 12 encloses the outer surface of the second mating portion 22 and the surfaces of the posterior teeth enclosed by the second mating portion 22, excluding the lingual and buccal surfaces, namely the buccal surface, occlusal surface, and mesial and distal surfaces of the tooth.

[0078] By setting it up in this way, the contact area between the first mating part 21, the second mating part 22 and the teeth can be reduced, increasing comfort, while also ensuring the overall stability of the dental instrument 100 after wearing.

[0079] Example 4

[0080] To achieve the purpose of this invention, this application also provides a dental instrument 100, please refer to... Figure 9As shown, the difference from Embodiment 1 is that in this embodiment, the first mating portion 21 and the second mating portion 22 respectively cover all surfaces of the teeth in the left and right posterior tooth regions. The first segment 11 wraps around the outer surface of the first mating portion 21, and the second segment 12 wraps around the outer surface of the second mating portion 22. In this way, by mating the first mating portion 21, the second mating portion 22, and all surfaces of the teeth at corresponding positions, the mating area is expanded, the retention force is increased, and the arch expansion force can be transmitted to a greater extent, which is beneficial to the arch expansion effect.

[0081] Furthermore, the surface contour shape of the first mating portion 21 adjacent to the tooth is consistent with the surface contour shape of the tooth it encloses, and the inner surface contour shape of the first segment 11 is consistent with the surface contour shape of the first mating portion 21 away from the tooth. This ensures stable mating between the first mating portion 21 and the tooth, as well as stable mating between the first segment 11 and the first mating portion 21, thereby enhancing the mating stability of the dental instrument 100 and facilitating the achievement of orthodontic objectives.

[0082] Alternatively, the surface contour shape of the second mating portion 22 adjacent to the tooth matches the surface contour shape of the tooth it encloses, and the inner surface contour shape of the second segment 12 matches the surface contour shape of the second mating portion 22 away from the tooth. This ensures stable mating between the second mating portion 22 and the tooth, as well as stable mating between the second segment 12 and the second mating portion 22, thereby enhancing the mating stability of the dental instrument 100 and facilitating the achievement of orthodontic objectives.

[0083] Preferably, the surface contour shape of the first mating portion 21 adjacent to the tooth is consistent with the surface contour shape of the tooth it encloses, and the inner surface contour shape of the first segment 11 is consistent with the surface contour shape of the first mating portion 21 away from the tooth. Simultaneously, the surface contour shape of the second mating portion 22 adjacent to the tooth is consistent with the surface contour shape of the tooth it encloses, and the inner surface contour shape of the second segment 12 is consistent with the surface contour shape of the second mating portion 22 away from the tooth. This improves the mating stability of the entire dental instrument 100.

[0084] To further explain, in this embodiment, please refer to [reference needed]. Figure 10As shown, the first mating part 21 further includes a first occlusal part 211 covering the occlusal surface of the tooth 200. The distal tooth side surface of the first occlusal part 211 and the occlusal surface of the tooth 200 covered by the first mating part 21 have a first preset height h1 in the vertical direction, used to adjust the vertical occlusal distance of the patient's upper and lower jaws. At this time, the first segment 11 mating on the outer surface of the first mating part 21 also has the first preset height h1 in the vertical direction with the corresponding occlusal surface of the tooth 200, so as to open the bite. By providing a first occlusal part 211 with a first preset height h1 on the occlusal surface of the first mating part 21, a vertical gap can be formed between the occlusal surface of the tooth 200 and the dental instrument 100, used to open the bite, avoid premature contact of posterior teeth during arch expansion, and prevent jaw interference.

[0085] It should be noted that the first occlusal portion 211 is provided to open the bite. Therefore, the first occlusal portion 211 of this application can be a hollow structure; it can also be a solid structure; or it can be a hollow structure filled with a filler to enhance the mechanical strength of the first occlusal portion 211.

[0086] Similarly, the second mating part 22 also includes a second occlusal part (not shown) covering the occlusal surface of the teeth. The distal tooth side surface of the second occlusal part and the occlusal surface of the teeth covered by the second mating part 22 have a second preset height in the vertical direction, used to adjust the vertical occlusal distance of the patient's upper and lower jaws. At this time, the second segment 12 mating on the outer surface of the second mating part 22 also has the second preset height in the vertical direction with the corresponding occlusal surface of the teeth, to open the bite. By providing a second occlusal part with a second preset height on the occlusal surface of the second mating part 22, a vertical gap can be formed between the occlusal surface of the teeth and the dental instrument 100, used to open the bite, avoid premature contact of posterior teeth during arch expansion, and prevent jaw interference.

[0087] It should be noted that the second occlusal portion is provided to open the bite. Therefore, the second occlusal portion of this application can be a hollow structure; it can also be a solid structure; or it can be a hollow structure filled with filler to enhance the mechanical strength of the second occlusal portion.

[0088] Example 5

[0089] To achieve the purpose of this invention, this application also provides a dental instrument 100, please refer to... Figure 11 and Figure 12As shown, the difference from Embodiment 1 is that in this embodiment, the outer surfaces of the first mating part 21 and / or the second mating part 22 are provided with a hollow structure (210, 220). This arrangement creates a "rivet effect," which increases the retention force between the mating part and the shell-shaped body 10, enhances the connection reliability of the dental instrument 100, and reduces the risk of dislocation.

[0090] Specifically, in some implementation methods, please refer to Figure 11 As shown, the occlusal surface of the first mating part 21 is provided with a hollow structure 210, and the inner surface of the occlusal surface of the first segment 11 corresponding to the position of the hollow structure 210 passes through the hollow structure 210 and wraps around the occlusal surface of the corresponding tooth; and the occlusal surface of the second mating part 22 is provided with a hollow structure 220, and the inner surface of the occlusal surface of the second segment 12 corresponding to the position of the hollow structure 220 passes through the hollow structure 220 and wraps around the occlusal surface of the corresponding tooth.

[0091] In other embodiments, please refer to Figure 11 As shown, the buccal side of the first mating portion 21 is provided with a hollow structure 210, and the inner surface of the buccal side of the first segment 11 corresponding to the position of the hollow structure 210 passes through the hollow structure 210 and wraps around the buccal surface of the corresponding tooth; and the buccal side of the second mating portion 22 is provided with a hollow structure 220, and the inner surface of the buccal side of the second segment 12 corresponding to the position of the hollow structure 220 passes through the hollow structure 220 and wraps around the buccal surface of the corresponding tooth.

[0092] In some other embodiments, the hollow structure 210 may also be disposed on the lingual side of the first mating part 21, and the inner surface of the lingual side of the first segment 11 corresponding to the position of the hollow structure 210 passes through the hollow structure 210 and wraps around the lingual surface of the corresponding tooth; and the hollow structure (210, 220) may also be disposed on the lingual side of the second mating part 22, and the inner surface of the lingual side of the second segment 12 corresponding to the position of the hollow structure 220 passes through the hollow structure 220 and wraps around the lingual surface of the corresponding tooth.

[0093] Of course, it is understandable that, for increasing retention, when both the first mating portion 21 and the second mating portion 22 are provided with perforated structures (210, 220), the retention effect is better when the first segment 11 and the second segment 12 have portions of their surfaces passing through the perforated structures (210, 220) and wrapping around the corresponding surfaces of the corresponding teeth; however, this application does not exclude the possibility of providing perforated structures 210 only on the first mating portion 21; or providing perforated structures 220 only on the second mating portion 22, and these technical solutions are also within the scope of protection of this application; as for the perforated structures ( The specific placement of the hollow structures (210, 220) on the lingual, buccal, or occlusal surfaces of the first mating part 21 or the second mating part 22 is not limited in this application. Taking the first mating part 21 as an example, the hollow structures (210, 220) may be placed only on the buccal surface, only on the lingual surface, only on the occlusal surface, or simultaneously on two or three surfaces, all of which are understandably within the scope of protection of this application. The position and manner of the hollow structures (210, 220) on the second mating part 22 are the same as those on the first mating part 21, and will not be repeated here.

[0094] 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.

[0095] 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.

[0096] 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, include: A shell-shaped body worn on the patient's maxillary dentition and an arch portion fitted to the patient's maxillary posterior teeth region for adjusting the width of the maxillary dental arch; The dental arch is an integral structure, including a first mating part that mates with the teeth in the left posterior region, a second mating part that mates with the teeth in the right posterior region, and a dental arch body connecting the first mating part and the second mating part; the left and right ends of the dental arch body are respectively connected to the lingual side of the first mating part and the lingual side of the second mating part. The shell-like body has a geometry that moves a movable tooth in the enclosed tooth from a first position to a second position; the shell-like body includes a first section that accommodates the first mating part and a second section that accommodates the second mating part, as well as a third section that encloses a tooth not mated by the first mating part and the second mating part. The first mating part is accommodated and fixed within the first section, and the outer surface of the first mating part and the inner surface of the first section corresponding to the position of the first mating part are in contact with each other; the second mating part is accommodated and fixed within the second section, and the outer surface of the second mating part and the inner surface of the second section corresponding to the position of the second mating part are in contact with each other.

2. The dental instrument according to claim 1, characterized in that, The first mating portion and the second mating portion only cover the lingual surfaces of the teeth in the left and right posterior tooth regions, respectively; the first section wraps the outer surface of the first mating portion and the surface of the tooth to which the first mating portion is mated, excluding the lingual surface, and the second section wraps the outer surface of the second mating portion and the surface of the tooth to which the second mating portion is mated, excluding the lingual surface.

3. The dental instrument according to claim 1, characterized in that, The first mating portion and the second mating portion also cover the buccal surfaces of the teeth in the left and right posterior tooth regions, respectively; the first section wraps the outer surface of the first mating portion and the surface of the teeth to which the first mating portion is mated, excluding the lingual and buccal surfaces, and the second section wraps the outer surface of the second mating portion and the surface of the posterior tooth region teeth wrapped by the second mating portion, excluding the lingual and buccal surfaces.

4. The dental instrument according to claim 1, characterized in that, The first mating portion and the second mating portion respectively cover all surfaces of the teeth in the left and right posterior tooth regions. The first segment wraps around the outer surface of the first mating portion, and the second segment wraps around the outer surface of the second mating portion.

5. The dental instrument according to claim 4, characterized in that, When the first mating part and the second mating part respectively cover all surfaces of the teeth in the left and right posterior tooth regions, the first mating part includes a first occlusal part covering the occlusal surface of the teeth, and the distal tooth side surface of the first occlusal part and the occlusal surface of the teeth covered by the first mating part have a first preset height in the vertical direction to adjust the vertical occlusal distance of the patient's upper and lower jaws. The second mating part includes a second occlusal part covering the occlusal surface of the teeth, and the distal tooth side surface of the second occlusal part and the occlusal surface of the teeth covered by it have a second preset height to adjust the vertical occlusal distance of the patient's upper and lower jaws.

6. The dental instrument according to any one of claims 1-5, characterized in that, The outer surface of the first mating part is provided with a first retention part that is fixed to the first section, and the inner surface of the first section corresponding to the position of the first retention part is provided with a first matching part that matches the first retention part; the first retention part is a retention attachment provided on the outer surface of the first mating part, or the first retention part is formed by a portion of the outer surface of the first mating part protruding outward or concave inward; wherein, the first mating part and the first section are fixedly connected by the concave-convex fit between the first retention part and the first matching part; and the outer surface of the first mating part is at least one of the lingual surface, buccal surface, and occlusal surface of the first mating part. And / or, The outer surface of the second mating part is provided with a second retention part that is fixed to the second section, and the inner surface of the second section corresponding to the position of the second retention part is provided with a second matching part that matches the second retention part; the second retention part is a retention attachment provided on the outer surface of the second mating part, or the second retention part is formed by a portion of the outer surface of the second mating part being convex or concave; wherein the second mating part and the second section are fixedly connected by the convex-concave fit between the second retention part and the second matching part; and the outer surface of the second mating part is at least one of the lingual surface, buccal surface, and occlusal surface of the second mating part.

7. The dental instrument according to any one of claims 1-5, characterized in that, The outer surface of the first mating part is provided with a hollow structure, the inner surface of the first section corresponding to the position of the hollow structure passes through the hollow structure and wraps around the corresponding tooth surface; and the outer surface of the first mating part is at least one of the lingual surface, buccal surface and occlusal surface of the first mating part. And / or, The outer surface of the second mating part is provided with a hollow structure, the inner surface of the second section corresponding to the position of the hollow structure passes through the hollow structure and wraps around the tooth surface; and the outer surface of the second mating part is at least one of the lingual side, buccal side and occlusal surface of the second mating part.

8. The dental instrument according to any one of claims 1-5, characterized in that, The outer surface of the first mating part and the inner surface of the first section are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking, and / or the outer surface of the second mating part and the inner surface of the second section are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking; so that the tooth arch part is fixedly connected to the shell-shaped body.

9. The dental instrument according to any one of claims 1-5, characterized in that, The toothed portion is detachably and fixedly connected to the corresponding first segment and second segment and the shell-shaped body through the first mating portion and the second mating portion, respectively.

10. The dental instrument according to claim 9, characterized in that, The dental instrument includes multiple dental arches with different orthodontic forces in the horizontal direction, and the dental arches with different orthodontic forces are applied to different orthodontic stages or different wearing cycles in the same orthodontic stage.

11. The dental instrument according to any one of claims 1-5, characterized in that, The first mating part and the second mating part are respectively mated to at least one of the 4th to 7th teeth in the left and right posterior tooth regions, and the dental arch body covers the mesiodistal length of the mated teeth from mesiodistal upward; wherein, the first mating part and the second mating part are symmetrically arranged along the palatal midline, or, the first mating part and the second mating part are arranged at the same tooth position on the left and right sides of the posterior tooth region.

12. The dental instrument according to any one of claims 1-5, characterized in that, The dental arch body is arched in the direction of the palate, and the surface of the dental arch body facing the palate is set at a preset distance from the patient's palate, wherein the preset distance is greater than 0 and less than or equal to 15mm.

13. The dental instrument according to any one of claims 1-5, characterized in that, The shell-like body further includes a first palatal device that mates with the dental arch body. The upper surface of the first palatal device facing the patient's palate has the same contour shape and curvature as the lower surface of the dental arch body away from the patient's palate. The first palatal device and the shell-like body are an integral structure. The upper surface of the first palatal device facing the patient's palate and the lower surface of the dental arch body away from the patient's palate are fixedly connected by adhesive bonding, laser welding, or radiation crosslinking. Alternatively, the first palatal device is detachably connected to the dental arch body.

14. The dental instrument according to any one of claims 1-5, characterized in that, The shell-shaped body has a geometric structure that applies a corrective force to at least one tooth in the posterior region, causing distalization of the posterior tooth. The shell-shaped body also includes a second palatal device connected to the lingual side of the anterior region of the shell-shaped body. When worn, the second palatal device abuts against the anterior region of the patient's palate. The surface of the second palatal device facing the anterior region of the palate is adapted to the surface shape of the anterior region of the palate to resist the reaction force of the corrective force causing distalization of the posterior tooth. The second palatal device and the shell-shaped body are an integral structure.

15. The dental instrument according to claim 14, characterized in that, The second palatal device includes an anchor body and a blocking hole. The blocking hole is disposed between the anterior tooth region of the shell-shaped body and the anchor body, and is used to block the reaction force of the orthodontic force that pushes the posterior teeth distally from acting on the teeth in the anterior tooth region.

16. The dental instrument according to any one of claims 1-5, characterized in that, The rigidity of the toothed portion is greater than that of the shell-shaped body; wherein the toothed portion and the shell-shaped body are different at least in terms of manufacturing materials or thickness.

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