Dental instrument

Abstract

The utility model discloses a dental instrument. The dental instrument comprises an anchorage module, a segment type shell-shaped body, a first traction part arranged on the anchorage module and a second traction part arranged on the segment type shell-shaped body or teeth in an anterior tooth area, the anchorage module is connected to teeth in the posterior tooth areas of a patient in a matched mode and comprises a first retention connected crown, a second retention connected crown and a palate connecting rod which are connected to the posterior tooth areas on the left side and the right side of the patient in a matched mode respectively, the first retention connected crown is fixedly arranged on the first tooth in a sleeving mode, and the second retention connected crown is fixedly arranged on the second tooth in a sleeving mode. The first teeth and the second teeth corresponding to the rear tooth areas on the left side and the right side are bound into a whole through the palate connecting rod to form an integral anchorage; the fragment type shell-shaped body is used for binding teeth in an anterior tooth area of a patient into a whole and comprises a plurality of dental crown accommodating cavities for wrapping the teeth in the anterior tooth area of the patient; during wearing, the elastic traction part is hooked between the first traction part and the second traction part, so that teeth in the anterior tooth area move towards the posterior tooth area to close a gap generated after tooth extraction.

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, tooth extraction is an important treatment method. However, for the gap G (such as the space created after tooth extraction, e.g., symmetrical extraction of 4 teeth) Figure 1 Closure of the anterior teeth (as shown in the image) and how to control the anchorage of the posterior teeth during anterior tooth movement have always been hot research topics in orthodontics. Especially for invisible orthodontics, since its orthodontic principle is to apply orthodontic force to the teeth through the elastic deformation of elastic materials, the amount of movement in each step is small. If only a single layer of invisible aligner is used to retract the anterior teeth and close the gap, multiple sets of invisible aligners are usually required to gradually achieve the effect of anterior tooth retraction, which takes a long time and the retraction effect is not ideal. Moreover, the applicant found that in clinical practice, the posterior teeth area is often weakened because the posterior teeth on both sides cannot stably provide anchorage. This anchorage is easily destroyed by the reaction force of anterior tooth movement, resulting in adverse effects such as anterior tooth movement or tilting. These adverse effects will ultimately indirectly increase the risk of uncontrolled anterior tooth movement, leading to orthodontic failure. In the later stage, more time needs to be spent to straighten the tooth axis and continue to close the gap, which increases the difficulty and is time-consuming and laborious. For example, Chinese patent application number CN202320173405.X provides a dental orthodontic device to straighten posterior teeth that tilt toward the gap due to insufficient posterior tooth anchorage. However, this is a "remedial measure" after orthodontic failure, which will undoubtedly prolong the patient's overall orthodontic cycle and make the anterior teeth retraction less efficient during the gap closing process.

[0003] Therefore, it is of great significance to enhance the anchorage of posterior teeth and improve the efficiency of anterior tooth retraction during the process of closing the gap in tooth extraction cases. Utility Model Content

[0004] The technical problem solved by this utility model is to overcome the defects of the existing technology and provide a dental instrument that effectively closes the gaps between teeth. It can enhance the overall anchorage of the posterior teeth during the retraction of teeth in the anterior region, achieve the overall retraction of teeth in the anterior region, and effectively improve the orthodontic efficiency.

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

[0006] A dental instrument includes: an anchorage module, a segmented shell-like body, a first traction section, and a second traction section;

[0007] An anchorage module, fitted to the patient's posterior teeth, includes a first retention crown fitted to the patient's left posterior teeth, a second retention crown fitted to the patient's right posterior teeth, and a palatal connecting rod connecting the first and second retention crowns; the first retention crown includes a first retention portion that covers at least one first tooth in the left posterior teeth, the inner contour of the first retention portion matching the outer contour of the first tooth, the first retention portion including a first occlusal portion corresponding to the occlusal surface of the first tooth and conforming to the shape of the occlusal surface, the first occlusal portion having a first through hole at the corresponding cusp of the first tooth for the cusp to pass through; the second... The retention crown includes a second retention portion that covers at least one second tooth in the right posterior region. The inner contour of the second retention portion matches the outer contour of the second tooth. The second retention portion includes a second occlusal portion that corresponds to the occlusal surface of the second tooth and has a second through hole at the corresponding cusp of the second tooth for the cusp to pass through. The first retention crown is fitted and fixed to the first tooth, and the second retention crown is fitted and fixed to the second tooth. The palatal connecting rod binds the first tooth and the second tooth corresponding to the left and right posterior regions into a whole to form an integral anchorage.

[0008] The segmented shell-like body is used to bind the patient's anterior teeth into a whole, including several crown receiving cavities that enclose the patient's anterior teeth;

[0009] The first tensioning part is disposed on the support module;

[0010] The second traction part is used in conjunction with the first traction part to hook an elastic traction member. The second traction part is disposed on the crown receiving cavity or on the anterior teeth.

[0011] When worn, the two ends of the elastic traction member are hooked onto the first traction part and the second traction part respectively, so as to apply a sagittal backward traction force to the segmented shell-like body and the anterior teeth it covers, so as to move the anterior teeth towards the posterior teeth to close the gap created after tooth extraction.

[0012] This application uses the anchorage module to bind the patient's left and right posterior teeth into a single unit. Through the structural design of the first and second retention portions on both sides, both portions are securely fixed to the patient's posterior teeth. Specifically, the palatal connecting rod binds the corresponding first and second teeth on both sides of the posterior teeth into a single unit, forming an integrated anchorage. This allows the anchorage module to be reliably fixed to the patient's posterior teeth, forming a stable anchorage that works stably with the segmented shell-like body. This avoids the problem of posterior teeth easily shifting during anterior tooth traction due to insufficient anchorage, thus ensuring the achievement of the expected treatment effect. Furthermore, the segmented shell-like body in this application binds the anterior teeth into a single unit, which facilitates the overall movement of the anterior teeth during anterior tooth retraction, improving treatment efficiency.

[0013] Preferably, the first traction portion is disposed on the buccal side of the first retention portion or the second retention portion, and the second traction portion is disposed on the buccal side of the segmented shell-like body or the anterior teeth; or, the first traction portion is disposed on the lingual side of the first retention portion or the second retention portion, and the second traction portion is disposed on the lingual side of the segmented shell-like body or the anterior teeth.

[0014] Preferably, the first traction part is disposed on the side of the palatal connecting rod facing the anterior tooth region, and the second traction part is disposed on the lingual side of the segmented shell body or the anterior tooth region.

[0015] Preferably, the second traction part is disposed on the anterior teeth, and the segmented shell-like body has an opening structure corresponding to the position of the second traction part; thus, the traction force acts directly on the teeth, improving the transmission efficiency of the traction force; or, the second traction part is disposed on the segmented shell-like body, and the segmented shell-like body has a corresponding mounting platform for mounting the second traction part, the mounting platform being formed by protruding from the surface of the segmented shell-like body toward the distal teeth; thus, when installed via the mounting platform, the second traction part can avoid contact and pressure between the second traction part and the tooth surface, improving patient comfort; or, the second traction part and the segmented shell-like body are integrally formed; thus, the processing technology of the dental instrument is simplified, facilitating production and promotion.

[0016] Preferably, the number of the second traction parts is even, wherein the even number of the second traction parts are symmetrically arranged about the tooth midline. The advantage of this arrangement is that the force applied to the teeth on both sides is uniform during the retraction process, and the teeth will not shift due to excessive force on one side during the movement.

[0017] Preferably, the stiffness of the palatal connecting rod satisfies the following condition: under the action of the traction reaction force, the first retention crown and the second retention crown connected to the left and right sides of the palatal connecting rod of the anchorage module can maintain their relative positions unchanged. By limiting the stiffness of the palatal connecting rod, it is ensured that the posterior teeth on the left and right sides bound by the anchorage module will not move relative to each other when the anchorage module is subjected to the traction reaction force, thereby further enhancing the stability of the anchorage.

[0018] Preferably, the material of the palatal connecting rod has an elastic modulus greater than 150 GPa and less than or equal to 400 GPa.

[0019] Preferably, the palatal connecting rod has a circular cross-section with a diameter of 1.5mm-5mm. This circular design ensures a smooth outer edge for the palatal connecting rod, preventing scratches to the palate or tongue when fitted into the patient's mouth, thus guaranteeing safety.

[0020] Preferably, the palatal connecting rod is arched towards the hard palate, and a gap is formed 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. The arched design of the palatal connecting rod conforms to the anatomical structure of the hard palate, and the defined gap prevents interference between the palatal connecting rod and the tongue, avoiding excessive pressure on the hard palate, reducing the feeling of a foreign body, and improving the comfort of wearing dental instruments.

[0021] Preferably, the first retaining crown, the second retaining crown, and the palatal connecting rod are integrally formed structures, manufactured using casting or 3D printing processes. This integrally formed structure simplifies the manufacturing process, reduces micro-movements between the various structures, improves the overall strength and stability of the support module, extends its service life, and ensures stable connections. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the intraoral dentition of a patient who has undergone tooth extraction in the background art of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of a dental instrument according to the present invention, wherein the first traction part is disposed on the lingual side of the first retention part and the second retention part, and the second traction part is disposed on the lingual side of the segmented shell-shaped body.

[0025] Figure 3 This is a schematic diagram of another dental instrument of the present invention, wherein the first traction part is disposed on the lingual side of the first retention part and the second retention part, and the second traction part is disposed on the lingual side of the teeth in the anterior region.

[0026] Figure 4 The present invention provides a schematic diagram of the structure of another dental instrument, wherein the first traction part is disposed on the buccal side of the first retention part and the second retention part, and the second traction part is disposed on the buccal side of the segmented shell-shaped body.

[0027] Figure 5 This is a schematic diagram of the mounting platform in the dental instrument of this utility model;

[0028] Figure 6 This is a schematic diagram of another dental instrument according to the present invention, wherein the first traction part is disposed on the lingual side of the palatal connecting rod, and the second traction part is disposed on the lingual side of the segmented shell-shaped body. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] In the various embodiments of this utility model, 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 designated as FDI numbers 4-8, and teeth designated as FDI numbers 1-3 in the anterior tooth region. The teeth in the anterior tooth region include central incisors, lateral incisors, and canines.

[0032] The following will provide a detailed explanation in conjunction with the illustrations.

[0033] Please refer to Figure 2As shown, the dental instrument 100 of this application includes an anchorage module 1, a segmented shell-shaped body 2, a first traction part 21, and a second traction part 22. The anchorage module 1 is fitted to the patient's posterior teeth and includes a first retention crown 11 fitted to the patient's left posterior teeth, a second retention crown 12 fitted to the patient's right posterior teeth, and a palatal connecting rod 13 connecting the first retention crown 11 and the second retention crown 12. Specifically, the first retention crown 11 includes a first retention portion 10 that covers at least one first tooth in the left posterior teeth region. The inner contour of the first retention portion 10 matches the outer contour of the first tooth. This configuration, through contour matching, makes the fit more stable. The first retention portion 10 includes a first occlusal portion 111 that corresponds to the occlusal surface of the first tooth and has a shape consistent with the occlusal surface. Thus, the first occlusal portion 111 further increases the fitting area between the first retention portion 10 and the tooth, further enhancing the stability of the fit. For example, in one embodiment, the first retention portion 10 is bonded to the tooth by adhesive bonding. The first occlusal portion 111 in this application increases the fitting area between the first retention portion 10 and the tooth. The bonding area between the inner surface of the first retention portion 10 facing the tooth and the tooth is increased, which can improve the bonding stability. Furthermore, the first occlusal portion 111 is provided with a first through hole 112 at the corresponding tooth cusp of the first tooth for the tooth cusp to pass through. This first through hole setting makes the first occlusal portion 111 of the first retention portion 10 and the tooth cusp form a mechanical limit, reducing the movement between the first retention portion 10 and the tooth. After mating, the retention effect between the first retention portion 10 and the tooth is good. At the same time, the mechanical matching of the first through hole 112 and the tooth cusp can also play a guiding and positioning role during mating, which is convenient for installation. Moreover, especially when bonding with adhesive, the setting of the first through hole 112 is conducive to the overflow of adhesive from the first through hole 112, which helps the adhesive flow and even distribution, and avoids excessive thickness or uneven thickness on the occlusal side caused by the accumulation of adhesive on the tooth-facing surface of the first occlusal portion 111, which would affect the mating stability of the first retention portion 10. Thus, each of the first retention parts 10 on both sides is firmly fixed to the patient's posterior tooth area. The palatal connecting rod 13 binds the first and second teeth corresponding to the left and right posterior tooth areas into a whole to form an integral anchorage. This allows the anchorage module 1 to be reliably fixed to the patient's posterior tooth area teeth, forming a stable anchorage, so as to stably cooperate with the segmented shell body 2. This is beneficial to ensuring the realization of the expected treatment effect. Especially in the case of extraction of tooth 4, a stable posterior tooth anchorage is the key point in achieving gap closure orthodontic treatment, which directly affects the effect and efficiency of gap closure.

[0034] Further explanation: In this embodiment, the first retention crown 11 includes three first retention portions 10 that cover teeth 5-7 in the left posterior region. The inner contour of each first retention portion 10 matches the outer contour of the first tooth it covers. Taking the first retention portion 10 covering the left tooth 5 as an example, the inner contour of this first retention portion 10 matches the shape and size of the outer contour of the tooth 5. Furthermore, each first retention portion 10 has a first occlusal portion 111 corresponding to the occlusal surface of the tooth 5, and the first occlusal portion 111 is provided on the occlusal surface of the tooth 5, with the shape of the occlusal surface of the tooth 5 being consistent with that of the tooth 5. The tooth cusp has a first through hole 112 for the tooth cusp to pass through; the inner contours of the other two first retention portions 10 that wrap around the left 6th and 7th teeth also match the shape and size of the outer contours of the corresponding teeth. The first retention portion 10 includes a first occlusal portion 111 that corresponds to the occlusal surface of the 6th and 7th teeth and is consistent with the shape of the occlusal surface of the 6th and 7th teeth. The first occlusal portion 111 has a first through hole 112 for the tooth cusp to pass through at the tooth cusp of the 6th and 7th teeth. Such a first retention portion 10 configuration allows the first retention crown 11 to be securely fitted to the patient's left posterior tooth area.

[0035] Similarly, the second retention crown 12 includes three second retention portions 20 that cover teeth 5-7 in the right posterior region. The inner contours of the second retention portions 20 all match the outer contours of the second teeth covered by the second retention portions 20. Taking the second retention portion 20 covering the right tooth 5 as an example, the inner contour of the second retention portion 20 matches the shape and size of the outer contour of the tooth 5. Furthermore, the second retention portion 20 has a second occlusal portion 121 that matches the shape of the occlusal surface of the tooth 5, and the second occlusal portion 121 is located at the cusp of the tooth 5. A second through hole 122 is provided for the tooth cusp to pass through; the inner contours of the other two second retention portions 20 that wrap around the right 6th and 7th teeth are also in the same shape and size as the outer contours of the teeth at their corresponding positions. The second retention portion 20 includes a second occlusal portion 121 that is provided on the occlusal surface of the 6th and 7th teeth and is consistent with the shape of the occlusal surface of the 6th and 7th teeth. The second occlusal portion 121 is provided with a second through hole 122 at the tooth cusp of the 6th and 7th teeth for the tooth cusp to pass through. The second retention portion 20 is provided in this way so that the second retention crown 12 can be securely attached to the right posterior tooth area of ​​the patient.

[0036] Of course, in another embodiment, the first tooth enclosed by the first retention crown 11 can be one tooth, such as any one of teeth 5-7; or it can be two teeth, such as any two of teeth 5-7; the first tooth enclosed by the first retention crown 11 can also be four teeth, for example, when the patient has tooth 8, the first retention crown 11 can enclose teeth 5-8 in the left posterior region; all of these can achieve the purpose of this invention, and no limitation is made here.

[0037] Continuing the explanation, the segmented shell-like body 2 is used to bind the patient's anterior teeth into a whole, including several crown receiving cavities 23 that enclose the patient's anterior teeth. The segmented shell-like body 2 mainly encloses all the anterior teeth that need to be retracted in the orthodontic plan, and these teeth are arranged continuously. For example, if the extracted teeth are the fourth teeth on both sides of the maxilla, then the teeth that need to be retracted in the orthodontic plan are teeth 3-3. The segmented shell-like body 2 encloses these 6 continuously arranged teeth, and during the movement, these 6 teeth are bound together as a whole and moved as a whole. Or, if the extracted teeth are the third teeth on both sides of the maxilla, then the teeth that need to be retracted in the orthodontic plan are teeth 2-2. The segmented shell-like body 2 encloses these 4 continuously arranged teeth, and during the movement, these 4 teeth are bound together as a whole and moved as a whole. Thus, the segmented shell-like body 2 binds the anterior teeth into a whole. During the retraction of the anterior teeth, it facilitates the overall movement of the anterior teeth, avoiding or reducing the need for subsequent orthodontic treatment to straighten the anterior tooth axis, thereby improving treatment efficiency. Furthermore, without compressing the gums, the buccal and / or lingual sides of the segmented shell-like body 2 may also include an extension that extends to cover part of the gum. When worn, saliva forms a seal between the gum and the extension, enhancing the retention force between the segmented shell-like body 2 and the teeth, thereby making the segmented shell-like body 2 more stable and secure after being bound to the anterior teeth as a whole.

[0038] Further explanation: the first traction part 21 is disposed on the anchorage module 1. In this embodiment, there are two first traction parts 21, respectively disposed on the lingual side of the first retention part 10 and the lingual side of the second retention part 20; two second traction parts 22, which cooperate with the first traction parts 21, are disposed on the lingual side of the segmented shell-shaped body 2. In use, the two ends of an elastic traction member 3 are hooked onto the first traction part 21 and the second traction part 22 respectively, so as to apply a sagittal backward traction force to the segmented shell-shaped body 2 and the anterior teeth it encloses, thereby moving the anterior teeth towards the posterior teeth region and closing the gap created after tooth extraction.

[0039] In another embodiment, please refer to Figure 3As shown, there are two first traction portions 21, respectively disposed on the lingual side of the first retention portion 10 and the lingual side of the second retention portion 20; two second traction portions 22, which cooperate with the first traction portions 21, are disposed on the lingual side of the anterior teeth. Further, the segmental shell-like body 2 has an opening structure 24 on its lingual side corresponding to the position of the second traction portion 22. The opening structure 24 is used to avoid the second traction portions 22 disposed on the anterior teeth; its specific structure can be... Figure 3 The notch structure shown is a gingival opening provided on the segmented shell-like body 2; alternatively, it can be a through-hole structure provided on the segmented shell-like body 2 at a position corresponding to the second traction part 22, without a gingival opening, allowing the second traction part 22 to pass through. It should be noted that this application does not limit the location distribution of the second traction part in the anterior tooth region. For example, in this embodiment, two second traction parts 22 are symmetrically arranged on the lingual side of the same number teeth (left tooth #2 and right tooth #2) on both sides of the anterior tooth region; however, in another embodiment, the two traction parts can also be respectively arranged on the lingual side of different number teeth on both sides of the anterior tooth region, for example, left tooth #3 and right tooth #2 respectively.

[0040] In another embodiment, the first traction portion 21 may also be simultaneously disposed on the buccal side of the first retention portion 10 and the second retention portion 20, and on the lingual side of the first retention portion 10 and the second retention portion 20. Correspondingly, the second traction portion 22 may be simultaneously disposed on the buccal side of the segmented shell-shaped body 2 and on the lingual side of the segmented shell-shaped body 2. Alternatively, the first traction portion 21 may also be simultaneously disposed on the buccal side of the first retention portion 10 and the second retention portion 20, and on the lingual side of the first retention portion 10 and the second retention portion 20. Correspondingly, the second traction portion 22 may be simultaneously disposed on the buccal side of the anterior teeth and on the lingual side of the anterior teeth. Furthermore, the buccal and lingual sides of the segmented shell-shaped body 2 have opening structures at the positions corresponding to the second traction portion 22 to avoid the second traction portion 22 disposed on the anterior teeth.

[0041] In yet another embodiment, please refer to Figure 4As shown, the first traction portion 21 can also be disposed on the buccal side of the first retention portion 10 and the second retention portion 20, and correspondingly, the second traction portion 22 can also be disposed on the buccal side of the segmented shell-shaped body 2. Alternatively, the first traction portion 21 can also be disposed on the buccal side of the first retention portion 10 and the second retention portion 20, and correspondingly, the second traction portion 22 can also be disposed on the buccal side of the anterior teeth, and the buccal side of the segmented shell-shaped body 2 has an opening structure at the position corresponding to the second traction portion 22 to avoid the second traction portion 22 disposed on the anterior teeth.

[0042] To further explain, when the second pulling part 22 is disposed on the segmented shell-shaped body 2, the second pulling part 22 and the segmented shell-shaped body 2 can be integrally formed. This simplifies the manufacturing process of the dental instrument 100 and facilitates production and promotion. For example, it can be formed directly on a corresponding male mold using a hot-press molding process, or directly printed using additive manufacturing. In another embodiment, the second pulling part 22 can also be manufactured separately and disposed separately from the segmented shell-shaped body 2. Specifically, please refer to... Figure 5 As shown, an installation platform 25 is provided at the position corresponding to the installation location of the second traction part 22 on the segmented shell-shaped body 2. The installation platform 25 is a bubble structure formed by protruding from the surface of the segmented shell-shaped body 2 in the direction of distal teeth. Thus, a cavity is formed between the inner surface of the installation platform 25 and the surface of the tooth 4 it covers. When the second traction part 22 is installed, the connecting section of the second traction part 22 (i.e., the section near the tooth surface) is inserted into the cavity of the installation platform 25 and securely installed. For example, the connecting section and the installation platform 25 are fixed by a snap-fit ​​structure or by adhesive. In this way, the connecting section is accommodated in the cavity of the installation platform 25, thereby avoiding contact and pressure with the surface of the tooth 4 it covers, and improving patient comfort. Furthermore, the end surface of the connecting section near the surface of the tooth 4 can also be set as a curved arc surface consistent with the surface of the tooth 4 to further enhance the stability after installation and further improve patient comfort.

[0043] In yet another embodiment, please refer to Figure 6As shown, the first traction part 21 can also be disposed on the palatal connecting rod 13. It should be noted that when there are two or more palatal connecting rods 13, the first traction part 21 is disposed on the palatal connecting rod 13 closest to the anterior teeth. Specifically, the first traction part 21 is disposed on the side of the palatal connecting rod 13 facing the anterior teeth, and the second traction part 22 is disposed on the lingual side of the segmented shell-shaped body 2. Alternatively, the first traction part 21 is disposed on the side of the palatal connecting rod 13 facing the anterior teeth, and the second traction part 22 is disposed on the lingual side of the anterior teeth. Further, the buccal side of the segmented shell-shaped body 2 has an opening structure corresponding to the position of the second traction part 22 to avoid the second traction part 22 disposed on the anterior teeth.

[0044] To further explain, as mentioned above, without compressing the gums, the segmented shell-like body 2 may also include an extension that extends to cover part of the gums. In this case, the second traction part 22 may also be disposed on the extension of the segmented shell-like body 2. Thus, the second traction part 22 is disposed corresponding to the gums, thereby further bringing the point of application of the traction force closer to the resistance center of the tooth. During the traction process, the tooth can move as a whole, reducing the probability of undesirable excessive tilting.

[0045] More preferably, the number of the second traction portions 22 can be even, wherein the even number of the second traction portions 22 are symmetrically arranged about the tooth midline L. Please refer again. Figure 6 As shown, in this embodiment, there are two second traction portions 22, and the two second traction portions 22 are symmetrically arranged about the dental midline L, for example, respectively corresponding to the crown receiving cavities 23 of the same number teeth on the left and right sides (tooth number 1 on the left and tooth number 1 on the right). The advantage of this arrangement is that the force applied to the teeth on both sides is uniform during the retraction process, and the teeth will not shift due to excessive force on one side during the movement. Preferably, in order to enable the teeth in the anterior region to move more effectively and quickly, the second traction portions 22 can be set for all the teeth that need to be moved. Similarly, when two second traction portions 22 are set on the teeth in the anterior region, the even number of second traction portions 22 are symmetrical about the dental midline L, respectively corresponding to the same number teeth on the left and right sides. Of course, in other embodiments, the number of second traction portions 22 can also be four or six symmetrically arranged about the dental midline L, depending on the actual needs of the specific case. In some other embodiments, an even number of second traction portions may not be symmetrical about the tooth midline. For example, when there are two second traction portions, the two second traction portions may be respectively set on the crown receiving cavities of the left tooth No. 2 and the right tooth No. 3, which are not symmetrical about the tooth midline.

[0046] It should be noted that the shape between adjacent elastic traction members 3 after hooking depends on the relative position between the first pulling part 21 and the second pulling part 22. For example, in Figure 6 In the illustrated embodiment, after the two sets of first pulling parts 21 and second pulling parts 22 hook onto the elastic traction member 3, the two elastic traction members 3 are in a nearly parallel state; for example, in Figure 2 and Figure 3 In the embodiment shown, the elastic traction members 3 after being hooked can also be in a non-parallel state, roughly arranged in a figure-eight shape.

[0047] The palatal connecting rod 13 is further described below. Its two ends are connected to the lingual side of the first retention crown 11 and the lingual side of the second retention crown 12, respectively. The stiffness of the palatal connecting rod 13 satisfies the following condition: under the action of the traction reaction force, the first retention crown 11 and the second retention crown 12 connected to the left and right sides of the palatal connecting rod 13 can maintain their relative positions unchanged. By limiting the stiffness of the palatal connecting rod 13, it is ensured that when the anchorage module 1 is subjected to the traction reaction force, the posterior teeth on both sides bound by it will not move relative to each other, thereby further enhancing the stability of the anchorage. More preferably, the elastic modulus of the material of the palatal connecting rod 13 is greater than 150 GPa and less than or equal to 400 GPa. In some embodiments, the elastic modulus of the material can be 150 GPa, 200 GPa, 380 GPa, or 400 GPa. For example, in clinical applications, the anchorage module 1 can be made of a metallic material (such as steel, with an elastic modulus of approximately 200 GPa) that meets the material elastic modulus requirements, or it can be made of a ceramic material (such as alumina ceramic material, with an elastic modulus of approximately 380 GPa) that meets the material elastic modulus requirements.

[0048] More preferably, the palatal connecting rod 13 has a circular cross-section. This structural design makes the outer edge of the palatal connecting rod 13 relatively smooth, so that it will not scratch the palate or tongue when fitted into the patient's mouth, ensuring safety. Preferably, the diameter of the cross-section of the palatal connecting rod 13 can be 1.5mm-5mm, for example, 1.5mm, 3mm or 5mm. This diameter setting is used to meet the rigidity requirements of the palatal connecting rod 13, so as to ensure that the first retention crown 11 and the second retention crown 12 can stably bind the teeth in the left and right posterior tooth areas into a whole, forming a stable anchorage.

[0049] Further explanation: The palatal connecting rod 13 is arched towards the hard palate, and there is a gap between the side of the palatal connecting rod 13 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 design of the palatal connecting rod 13 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 13 and the tongue, thus improving the comfort of wearing the dental instrument 100. Simultaneously, maintaining a gap between the palatal connecting rod 13 and the hard palate ensures sufficient space for oral cleaning and saliva flow, while also preventing excessive pressure from the palatal connecting rod 13 on the hard palate, reducing the feeling of a foreign body. For example, in some embodiments, the gap is set to 2 mm, 5 mm, or 10 mm to accommodate the individual oral morphology of different patients, i.e., different patients have different "arch" heights of their hard palates, or it can be flexibly set according to the patient's preference. Furthermore, the palatal connecting rod 13 can be one, two, or three. Preferably, two palatal connecting rods 13 are provided. This prevents the anchorage module 1 from flipping over, enhancing the overall balance and stability of the dental instrument 100, while also avoiding excessively increasing the volume of the anchorage module 1 located in the mouth, thus improving patient comfort. It should be noted that, in another embodiment, the palatal connecting rod 13 can also be non-arched, facing the hard palate, while still achieving the purpose of this invention, namely, binding the left and right posterior tooth regions into a whole to form an integrated anchorage; the palatal connecting rods in this application are not limited to an arched shape.

[0050] To further explain, the first retention crown 11, the second retention crown 12, and the palatal connecting rod 13 are integrally molded structures. This integral molding design simplifies the manufacturing process, reduces micro-movements between the structures, improves the overall strength and stability of the anchorage module 1, extends its service life, and ensures stable connection. Clinically, the anchorage module 1 can be manufactured using casting or 3D printing processes. For example, casting involves melting solid metal materials (such as stainless steel) into a liquid state and pouring it into a mold with the same shape as the anchorage module 1, allowing it to solidify. 3D printing technology allows for the personalized customization of complex structures, making it easier to meet diverse clinical needs. In another embodiment, the palatal connecting rod 13 and the first retaining crown 11 and the second retaining crown 12 can also be separately formed. For example, the palatal connecting rod 13 can be formed by bending steel wire, and the first retaining crown 11 and the second retaining crown 12 can be formed by casting or 3D printing. Then, the palatal connecting rod 13 can be installed between the first retaining crown 11 and the second retaining crown 12 by bonding, welding or other methods to form the support module 1. This separate arrangement makes it easier to flexibly select each structural component and facilitates cleaning and replacement.

[0051] 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.

[0052] 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.

[0053] 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: An anchorage module, fitted to the patient's posterior teeth, includes a first retention crown fitted to the patient's left posterior teeth, a second retention crown fitted to the patient's right posterior teeth, and a palatal connecting rod connecting the first and second retention crowns; the first retention crown includes a first retention portion that covers at least one first tooth in the left posterior teeth, the inner contour of the first retention portion matching the outer contour of the first tooth, the first retention portion including a first occlusal portion corresponding to the occlusal surface of the first tooth and conforming to the shape of the occlusal surface, the first occlusal portion having a first through hole at the corresponding cusp of the first tooth for the cusp to pass through; the second... The retention crown includes a second retention portion that covers at least one second tooth in the right posterior region. The inner contour of the second retention portion matches the outer contour of the second tooth. The second retention portion includes a second occlusal portion that corresponds to the occlusal surface of the second tooth and has a second through hole at the corresponding cusp of the second tooth for the cusp to pass through. The first retention crown is fitted and fixed to the first tooth, and the second retention crown is fitted and fixed to the second tooth. The palatal connecting rod binds the first tooth and the second tooth corresponding to the left and right posterior regions into a whole to form an integral anchorage. The segmented shell-like body is used to bind the patient's anterior teeth into a whole, including several crown receiving cavities that enclose the patient's anterior teeth; The first tensioning part is disposed on the support module; The second traction part is used in conjunction with the first traction part to hook an elastic traction member. The second traction part is disposed on the crown receiving cavity or on the anterior teeth. When worn, the two ends of the elastic traction member are hooked onto the first traction part and the second traction part respectively, so as to apply a sagittal backward traction force to the segmented shell-like body and the anterior teeth it covers, so as to move the anterior teeth towards the posterior teeth to close the gap created after tooth extraction.

2. The dental instrument according to claim 1, characterized in that, The first traction portion is disposed on the buccal side of the first retention portion or the second retention portion, and the second traction portion is disposed on the buccal side of the segmented shell-shaped body or the anterior teeth; or, the first traction portion is disposed on the lingual side of the first retention portion or the second retention portion, and the second traction portion is disposed on the lingual side of the segmented shell-shaped body or the anterior teeth.

3. The dental instrument according to claim 1, characterized in that, The first traction part is disposed on the side of the palatal connecting rod facing the anterior tooth region, and the second traction part is disposed on the lingual side of the segmented shell body or the anterior tooth region.

4. The dental instrument according to claim 1, characterized in that, The second traction portion is disposed on the anterior teeth, and the segmented shell-like body has an opening structure corresponding to the position of the second traction portion; or, The second traction part is disposed on the segmented shell-shaped body, and the segmented shell-shaped body is correspondingly provided with a mounting platform for mounting the second traction part. The mounting platform is formed by protruding from the surface of the segmented shell-shaped body in the distal tooth direction; or, The second traction part and the segmented shell-shaped body are integrally formed.

5. The dental instrument according to claim 1, characterized in that, The number of the second traction parts is even, wherein the even number of the second traction parts are symmetrically arranged about the tooth midline.

6. The dental instrument according to claim 1, characterized in that, The stiffness of the palatal connecting rod satisfies the following condition: under the action of the traction reaction force, the first and second fixed crowns connected to the left and right sides of the palatal connecting rod can maintain their relative positions unchanged.

7. The dental instrument according to any one of claims 1-6, characterized in that, The material elastic modulus of the palatal connecting rod is greater than 150 GPa and less than or equal to 400 GPa.

8. The dental instrument according to claim 7, characterized in that, The palatal connecting rod has a circular cross-section, and the diameter of the cross-section is 1.5mm-5mm.

9. The dental instrument according to any one of claims 1-6, characterized in that, The palatal connecting rod is arched in the direction of 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, wherein the gap is greater than 0 and less than or equal to 10 mm.

10. The dental instrument according to claim 1, characterized in that, The first retaining crown, the second retaining crown, and the palatal connecting rod are integrally formed structures, manufactured by casting or 3D printing.

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