Molar tooth aligner

Abstract

The utility model discloses a kind of molar correctors, it is related to oral orthodontic instrument technical field.Molar corrector includes anchorage seat, traction seat, guide seat;Anchorage seat is fixedly connected with the multiple near teeth of patient close to teeth gap;Traction seat is fixedly connected with the second molar of patient, and traction seat and anchorage seat between connection are equipped with the traction piece with elasticity;Guide seat is fixedly connected with anchorage seat, and guide seat is equipped with guide portion, and traction seat is equipped with the sliding member corresponding with guide portion, and the guide track of guide portion corresponds with the tooth arrangement track of patient;Molar corrector provided by the utility model, traction seat can be with the second molar gradually close to near tooth under the elastic force of traction piece, and the guide portion of guide seat can guide the movement track of sliding member during the movement of second molar, to avoid second molar to occur side spin, mesial deviation etc. During movement, ensure treatment effect, guarantee the long-term stability of orthodontic treatment.

Description

Technical Field

[0001] This utility model relates to the field of dental orthodontic instruments, and in particular to a molar orthodontic appliance. Background Technology

[0002] Orthodontic treatment often encounters situations where the first molar is missing or severely damaged and cannot be saved. When the tooth germ of the third molar is confirmed to be present and well-developed, the treatment plan often considers extracting the unsustainable first molar, mesial moving the second and third molars, and closing the gap left by the first molar. Furthermore, for cases involving reduced extractions, or molars with moderate or minimal anchorage, mesial movement of the molars is also necessary to close the extraction gap.

[0003] However, current methods for mesial mandibular molar repositioning have revealed some significant drawbacks in practical applications. When using a gradual repositioning approach, if external force is applied directly to the crown of the molar, the tooth is prone to mesial tilting due to factors such as the point of force application and direction. This tilting not only affects the accuracy and stability of tooth repositioning but may also adversely impact the surrounding alveolar bone and adjacent teeth.

[0004] Another method involves using a long-arm traction hook on the buccal side of the molar to transfer force to the archwire, thereby moving the molar. However, this method also has potential problems. During the application of force, uneven force transmission and distribution may cause distal movement or tilting of the anchorage tooth. Abnormal movement of the anchorage tooth can disrupt the originally designed orthodontic force system, affecting the effectiveness of mesial movement of the molar, and may even lead to the failure of the entire orthodontic plan.

[0005] Furthermore, existing methods that only apply force to the buccal side of the molars may lead to problems such as buccal rotation and buccal tilting. When a molar tilts buccally, it may encounter the buccal cortex, resulting in cortical bone anchorage. Once cortical bone anchorage occurs, the movement of the molar will be significantly hindered, making it difficult to close the gap in the intended direction and degree, which greatly complicates orthodontic treatment. Utility Model Content

[0006] In view of this, the purpose of this utility model is to overcome the shortcomings of related technologies, and this utility model provides a molar orthodontic appliance.

[0007] This utility model provides the following technical solution:

[0008] A molar orthodontic appliance includes an anchorage, a traction seat, and a guide seat.

[0009] The anchorage is fixedly connected to multiple mesial anterior teeth near the interdental space of the patient. Specifically, the mesial anterior teeth include the first premolar, second premolar, and canine near the interdental space. The traction seat is fixedly connected to the patient's second molar. An elastic traction element connects the traction seat and the anchorage. Both the anchorage and traction seats are ring-shaped and are fitted onto their respective teeth for easy assembly. The guide seat is fixedly connected to the anchorage. The guide seat has a guide portion, and the traction seat has a sliding element corresponding to the guide portion. The guide trajectory of the guide portion corresponds to the patient's tooth arrangement trajectory, and the guide portion guides the movement trajectory of the sliding element.

[0010] As a further improvement to the above technical solution, the guide seat is provided with a guide rail, which is used to form a guide part, and the sliding member is installed in the guide rail.

[0011] As a further improvement to the above technical solution, the sliding element is specifically a pulley, which is sleeved on the transmission shaft provided on the traction seat; the pulley is located inside the guide rail and can roll along the guide trajectory of the guide rail.

[0012] As a further improvement to the above technical solution, the support seat is provided with a fixed shaft, the fixed shaft passes through the guide rail of the guide seat, the traction member is located in the guide rail, and the two ends of the traction member are respectively assembled and connected to the transmission shaft and the fixed shaft.

[0013] As a further improvement to the above technical solution, a cover is installed on the end face of the guide seat away from the patient's teeth, and the cover is placed on the outside of the guide rail.

[0014] As a further improvement to the above technical solution, the traction component is specifically a tension spring.

[0015] As a further improvement to the above technical solution, hooks are provided at both ends of the tension spring, and the hooks at both ends of the tension spring are respectively hung on the transmission shaft and the fixed shaft.

[0016] As a further improvement to the above technical solution, the drive shaft and the fixed shaft are respectively provided with limiting grooves corresponding to the hook, and the hook is hung in the limiting groove.

[0017] As a further improvement to the above technical solution, the sliding member is disposed on the middle side of the second molar near its root, specifically at the root bifurcation of the root, and the traction point is located at the impedance center of the second molar.

[0018] As a further improvement to the above technical solution, two guide seats are provided on the inner and outer sides of the patient's teeth respectively.

[0019] Compared with related technologies, the beneficial effects of this utility model are:

[0020] This utility model provides a molar orthodontic appliance. In actual use, firstly, the anchorage is fixedly connected to several mesial anterior teeth in the patient's mouth. Next, the traction seat is fixedly connected to the second molar requiring traction correction. Since the position and state of the second molar vary, precise positioning and installation are necessary when fixing the traction seat to ensure it is firmly attached to the second molar, providing a stable point of force for subsequent traction correction. After completing the above two steps, an elastic traction element is connected between the anchorage and the traction seat. Its elasticity provides continuous and appropriate traction force for the movement of the second molar. When connecting the traction element, care must be taken to adjust its tightness so that the traction force effectively moves the second molar without causing discomfort or injury to the patient due to excessive force. Simultaneously, the sliding element on the traction seat must cooperate with the guide part on the guide seat fixedly connected to the anchorage. The cooperative design of the guide seat and the sliding element allows the guide part to provide accurate guidance for the movement of the sliding element.

[0021] Under the elastic force of the traction element, the traction seat gradually moves the second molar closer to the anterior teeth. During this movement, the guiding part of the guide seat continuously guides the movement trajectory of the sliding element. Since the sliding element is connected to the traction seat, the movement trajectory of the second molar is also related to the movement trajectory of the sliding element. Through the guidance of the guiding part, it can be ensured that the movement trajectory of the second molar is exactly the same as the patient's original normal tooth arrangement trajectory.

[0022] This effectively avoids problems such as lateral rotation and mesial movement of the second molars during the movement process. Abnormalities such as lateral rotation and mesial movement not only affect the orthodontic effect but may also lead to further misalignment of the patient's teeth and even cause other oral problems. The molar appliance of this invention, through its reasonable design and accurate guiding mechanism, can ensure the orthodontic effect on the patient's teeth and help the patient restore healthy and straight tooth alignment.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the molar orthodontic appliance from one perspective in one embodiment of the present invention;

[0026] Figure 2 This diagram shows another perspective view of the molar orthodontic appliance in one embodiment of the present invention.

[0027] Explanation of key component symbols:

[0028] 100-Support seat; 110-Fixed shaft; 111-Limiting groove; 210-Proximal front tooth; 220-Second molar; 300-Traction seat; 310-Pulley; 320-Drive shaft; 400-Traction component; 410-Tension spring; 411-Hook; 500-Guide seat; 510-Guide rail; 520-Block. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0034] Combination Figure 1 , Figure 2 As shown, an embodiment of this utility model provides a molar orthodontic appliance, including an anchorage 100, a traction seat 300, and a guide seat 500.

[0035] The anchorage seat 100 is fixedly connected to multiple mesial teeth 210 near the interdental space of the patient. Specifically, the mesial teeth 210 include a first premolar, a second premolar, and a canine near the interdental space. The traction seat 300 is fixedly connected to the patient's second molar 220. An elastic traction member 400 is connected between the traction seat 300 and the anchorage seat 100. Both the anchorage seat 100 and the traction seat 300 are ring-shaped and are respectively fitted onto the corresponding teeth for easy assembly. The guide seat 500 is fixedly connected to the anchorage seat 100. The guide seat 500 has a guide portion, and the traction seat 300 has a sliding member corresponding to the guide portion. The guide trajectory of the guide portion corresponds to the patient's tooth arrangement trajectory, and the guide portion is used to guide the movement trajectory of the sliding member.

[0036] The molar orthodontic appliance provided in this embodiment is first fixedly connected to the anchorage 100 and multiple mesial anterior teeth 210 in the patient's oral cavity. Next, the traction seat 300 is fixedly connected to the second molar 220 that requires traction correction. Since the positions and states of the second molars 220 vary, the traction seat 300 must be precisely positioned and installed according to the actual situation to ensure that it is firmly attached to the second molars 220, providing a stable point of force for subsequent traction correction. After completing the above two steps, an elastic traction element 400 is connected between the anchorage 100 and the traction seat 300. Its elasticity provides continuous and appropriate traction force for the movement of the second molars 220. When connecting the traction element 400, care must be taken to adjust its tightness so that the traction force effectively moves the second molars 220 without causing discomfort or injury to the patient due to excessive force. Simultaneously, the sliding element on the traction seat 300 must mate with the guide portion on the guide seat 500, which is fixedly connected to the support seat 100. The mating design of the guide seat 500 and the sliding element enables the guide portion to provide accurate guidance for the movement of the sliding element.

[0037] Under the elastic force of the traction member 400, the traction seat 300 gradually moves the second molar 220 closer to the mesial incisor 210. During this movement, the guiding part of the guide seat 500 continuously guides the movement trajectory of the slider. Since the slider is connected to the traction seat 300, the movement trajectory of the second molar 220 is associated with the movement trajectory of the slider. Through the guidance of the guiding part, it can be ensured that the movement trajectory of the second molar 220 is exactly the same as the patient's original normal tooth arrangement trajectory. In this way, problems such as lateral rotation, mesial movement, and tilting of the second molar 220 during movement can be effectively avoided. In some specific embodiments, the guide seat 500 is provided with a guide rail 510, which forms a guiding part. The slider is installed in the guide rail 510, and the inner sidewall of the guide rail 510 is specifically smoothed. The slider can slide along the guiding direction on the guide rail 510, which facilitates the restriction of the movement trajectory of the second molar 220 and ensures the orthodontic effect on the patient's teeth.

[0038] In some specific embodiments, different shapes of the guide rail 510 correspond to different guide trajectories for the slider; the specific shape of the guide rail 510 can be determined by drawing heavily on clinical experience. In long-term medical practice, doctors have accumulated a wealth of data and cases regarding patients' dental conditions. Based on this valuable experience, and considering the common shape characteristics exhibited by most patients, intermediate shape values ​​are selected as the design basis for the guide rail 510, which is then mass-produced. This approach has several advantages. On the one hand, the mass-produced guide rail 510 is suitable for most patients' molar orthodontic treatment, meeting the needs of most patients; on the other hand, mass production can effectively reduce production costs and improve production efficiency, enabling more patients to benefit from this orthodontic product.

[0039] Of course, the medical field emphasizes the importance of personalized treatment, and the design of the guide rail 510 is no exception. In addition to the mass production methods mentioned above, the guide rail 510 can also be customized to suit the specific needs of different patients. Each patient's dental condition is unique; some patients may have specific dental malocclusions or occlusal problems. By customizing the guide rail 510 to address these special cases, it can more precisely conform to the patient's tooth structure, providing a more suitable guiding trajectory for the sliding mechanism, thereby improving the treatment effect for the corresponding patient's molars and achieving a more ideal orthodontic goal.

[0040] In some specific embodiments, the sliding member is specifically a pulley 310, which is sleeved on the transmission shaft 320 provided on the traction seat 300. The pulley 310 is located inside the guide rail 510 and can roll along the guide trajectory of the guide rail 510, which helps to reduce the relative wear that occurs when the sliding member moves relative to the guide rail 510, and extends the service life of this embodiment.

[0041] In some specific embodiments, the anchorage 100 is provided with a fixed shaft 110, which passes through the guide rail 510 of the guide seat 500. The traction member 400 is located within the guide rail 510, and both ends of the traction member 400 are respectively assembled and connected to the drive shaft 320 and the fixed shaft 110. This ingenious design, by placing the traction member 400 within the guide rail 510, offers significant advantages. During the use of a molar appliance, the oral mucosa is relatively soft and sensitive. If the traction member 400 is exposed outside the guide rail 510, it is prone to frequent contact and friction with the oral mucosa. This arrangement effectively reduces the probability of the traction member 400 contacting the patient's oral mucosa. Because the guide rail 510 provides a relatively independent and enclosed space for the traction member 400, most of its movement is completed within the rail when performing traction, reducing direct collisions with the oral mucosa. This avoids damage to the patient's oral cavity, such as scratches or abrasions, thus greatly improving the safety of this embodiment and making the patient more comfortable and at ease during use.

[0042] In some specific embodiments, a cover 520 is installed on the end face of the guide seat 500 opposite to the patient's teeth. The cover 520 covers the outside of the guide rail 510. The cover 520 is made of a biocompatible and relatively tough material, which can adapt to the complex environment in the oral cavity while ensuring a certain structural strength. Its shape and size are precisely customized according to the specific contour of the end face of the guide seat 500 opposite to the teeth and the layout of the guide rail 510 to ensure a perfect fit with the guide seat 500.

[0043] During daily use, patients' mouths undergo frequent activities such as eating, speaking, and swallowing. During these processes, various foreign objects, such as food debris and impurities in saliva, are generated in the mouth. Without the cover 520, these foreign objects can easily enter the guide track 510. Once a foreign object enters the guide track 510, it may affect the smooth sliding of the slider within the track, causing obstruction or even jamming, thus affecting the normal operation of the entire orthodontic appliance. Simultaneously, the foreign object may also adhere to the slider or traction element 400. As the slider and traction element 400 move, these adhered foreign objects may cause friction and irritation to the oral tissues, leading to discomfort or even damage.

[0044] The cover 520 effectively isolates the guide rail 510, traction member 400, and slider from the patient's oral cavity. It blocks most foreign objects that might enter the guide rail 510, significantly reducing the probability of foreign objects from the patient's mouth entering the guide rail 510 or adhering to the slider or traction member 400 in daily life. This ensures that the interior of the guide rail 510 remains relatively clean and unobstructed, the slider can slide freely along a predetermined trajectory, and the traction member 400 can stably exert its traction effect. Therefore, this ensures the high reliability of the molar appliance in this embodiment during use, providing continuous and stable orthodontic services to the patient.

[0045] In some specific embodiments, the traction element 400 is specifically a tension spring 410. The tension spring 410 is a common elastic element with many characteristics suitable for use in molar orthodontic appliances. From a material perspective, the metal material constituting the tension spring 410 typically possesses good strength and toughness, and is not prone to breakage or permanent deformation under long-term tensile stress. In the unique environment of the oral cavity, the tension spring 410 needs to withstand frequent stretching and contraction, and must cope with the complex influences of oral temperature, humidity, and saliva. The selected metal material undergoes special treatment to possess excellent corrosion resistance, effectively preventing performance degradation due to corrosion and ensuring the long-term stable operation of the tension spring 410 within the oral cavity.

[0046] Structurally, the tension spring 410 has a regular helical shape, which allows it to produce uniform elastic deformation under tension. In the molar appliance, one end of the tension spring 410 is connected to the components of the anchor 100, and the other end is connected to the traction seat 300 and other structures. When the second molar 220 needs to be moved, the tension spring 410 is stretched, and the resulting elastic force can continuously and stably act on the traction seat 300, thereby driving the second molar 220 to move in a predetermined direction and trajectory. Moreover, the elastic coefficient of the tension spring 410 can be precisely selected and adjusted according to the different orthodontic needs of different patients. For patients with low resistance to tooth movement and low orthodontic force requirements, a tension spring 410 with a lower elastic coefficient can be selected; while for patients with high resistance to tooth movement and requiring greater orthodontic force, a tension spring 410 with a higher elastic coefficient is selected, thus achieving a personalized orthodontic plan.

[0047] In some specific embodiments, hooks 411 are provided at both ends of the tension spring 410, and the hooks 411 at both ends of the tension spring 410 are respectively hooked onto the drive shaft 320 and the fixed shaft 110. This hooking method is simple to operate. Medical staff only need to accurately put the hooks 411 on the corresponding positions of the drive shaft 320 and the fixed shaft 110 and apply light force to complete the connection, without complicated tools or cumbersome steps. Moreover, this connection method is firm and reliable. When the tension spring 410 exerts its traction effect, the hooks 411 can be firmly fixed on the drive shaft 320 and the fixed shaft 110, without loosening or slipping, thereby ensuring that the orthodontic appliance can work stably.

[0048] More importantly, this design facilitates the quick replacement of springs with varying elasticity to meet different tooth movement resistance requirements. Different patients have different dental conditions; some patients experience less tooth movement resistance and require only a small amount of elasticity for effective orthodontic treatment, while others experience greater resistance and require a spring with greater elasticity to provide sufficient traction. Furthermore, the amount of traction required for the same patient's teeth may vary at different stages of tooth movement. In these cases, medical staff do not need to make extensive adjustments or replace the entire appliance. They simply remove the existing tension spring 410 from the drive shaft 320 and fixed shaft 110, then select a tension spring 410 with appropriate elasticity and reattach it to the drive shaft 320 and fixed shaft 110 using hooks 411. The entire replacement process is quick and convenient, significantly reducing operation time and patient discomfort.

[0049] In some specific embodiments, the drive shaft 320 and the fixed shaft 110 are respectively provided with limiting grooves 111 corresponding to the hook 411. The hook 411 is hung in the limiting grooves 111 to improve the reliability of the cooperation between the hook 411 and the drive shaft 320 and the fixed shaft 110.

[0050] In some specific embodiments, the slider is disposed on the middle side of the second molar 220 near its root, specifically at the root bifurcation, with the traction point located at the resistance center of the second molar 220. From an anatomical perspective, the root is the key part where the tooth is firmly anchored in the alveolar bone, providing the main support and stability. Distributing the slider on the middle side near the root ensures that the point of force application on the second molar 220 is as close to the root as possible. When the traction force acts on the second molar 220 through the slider, the force transmission is more direct and uniform due to the proximity of the force application point to the root, allowing the tooth to maintain a relatively stable posture during movement.

[0051] During orthodontic treatment, if the point of force is far from the tooth root, such as applying traction force to the crown of the tooth, the tooth is prone to tilting around the root as a fulcrum under the influence of traction. This tilting not only affects the treatment outcome, leading to misaligned teeth, but may also cause unnecessary damage to the alveolar bone and periodontal tissues surrounding the teeth, affecting oral health.

[0052] By placing the sliding element on the side center near the tooth root, the probability of the second molar 220 tilting when moved under traction force is effectively reduced. Because the force point is close to the tooth root, the force in all directions is more balanced during tooth movement, reducing torque caused by uneven force distribution, thus allowing the tooth to move smoothly in the predetermined direction. This design maximizes the orthodontic effect, enabling the second molar 220 to move accurately and orderly to the ideal position, forming a neat and harmonious alignment with other teeth, ultimately helping patients restore a healthy and aesthetically pleasing oral cavity.

[0053] In some specific embodiments, two guide seats 500 are provided on the inner and outer sides of the patient's teeth respectively. Structurally, these two guide seats 500 are positioned at corresponding positions on the inner and outer sides of the patient's teeth. They are closely fitted to the teeth and stably fixed in their predetermined positions, and will not easily shift or loosen due to the patient's daily oral activities, such as chewing, speaking, and swallowing.

[0054] During the orthodontic treatment of the second molar 220, when the traction element 400 applies traction force to the second molar 220 to initiate its movement, the two guide seats 500 can simultaneously guide the movement trajectory of the second molar 220 from both sides of the tooth. Because the guidance is from both sides, a comprehensive constraint and guidance mechanism can be formed.

[0055] During tooth movement, it is inevitably affected by various complex forces, such as the pulling of oral muscles and the squeezing of adjacent teeth. These forces may cause deviations in the movement direction of the second molar 220. The presence of the two guide seats 500 can effectively counteract these interfering forces, limit the movement of the second molar 220 in non-predicted directions, and further ensure that the second molar 220 moves along the predetermined trajectory.

[0056] This trajectory guidance is crucial for the orthodontic treatment outcome. Only when the second molar 220 moves strictly along the predetermined trajectory can it form a good occlusal relationship with other teeth, achieving neat and aesthetically pleasing tooth alignment. Simultaneously, it avoids various oral problems caused by abnormal tooth movement, such as tooth loosening and gingival recession. Therefore, by placing two guide seats 500 on the inner and outer sides of the patient's teeth, the accuracy and success rate of orthodontic treatment can be greatly improved, ensuring that the patient's teeth achieve the ideal orthodontic results.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0058] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A mandibular appliance, comprising: include: An anchorage (100) is fixedly connected to multiple mesial anterior teeth (210) near the interdental space of the patient; A traction seat (300) is fixedly connected to the patient's second molar (220), and an elastic traction member (400) is provided between the traction seat (300) and the anchorage seat (100). A guide seat (500) is fixedly connected to the anchorage seat (100). The guide seat (500) is provided with a guide part. The traction seat (300) is provided with a sliding member corresponding to the guide part. The guide trajectory of the guide part corresponds to the patient's tooth arrangement trajectory. The guide part is used to guide the movement trajectory of the sliding member.

2. The night guard of claim 1, wherein, The guide seat (500) is provided with a guide rail (510), which is used to form a guide portion, and the sliding member is installed in the guide rail (510).

3. The night guard of claim 2, wherein, The sliding element is specifically a pulley (310), which is sleeved on the transmission shaft (320) provided on the traction seat (300); the pulley (310) is located in the guide rail (510) and can roll along the guide trajectory of the guide rail (510).

4. The night guard of claim 3, wherein, The support seat (100) is provided with a fixed shaft (110), which passes through the guide rail (510) of the guide seat (500). The traction member (400) is located in the guide rail (510), and the two ends of the traction member (400) are respectively assembled and connected to the transmission shaft (320) and the fixed shaft (110).

5. The night guard of claim 4, wherein, The guide seat (500) is equipped with a cover (520) on the end face opposite to the patient's teeth, and the cover (520) covers the outside of the guide rail (510).

6. The night guard of claim 4, wherein, The traction component (400) is specifically a tension spring (410).

7. The night guard of claim 6, wherein, The tension spring (410) is provided with hooks (411) at both ends, and the hooks (411) at both ends of the tension spring (410) are respectively hung on the transmission shaft (320) and the fixed shaft (110).

8. The night guard of claim 7, wherein, The drive shaft (320) and the fixed shaft (110) are respectively provided with limiting grooves (111) corresponding to the hook (411), and the hook (411) is hung in the limiting groove (111).

9. The night guard of any one of claims 1 to 8, wherein, The slider is located on the middle side of the second molar (220) near its root.

10. The mandibular appliance of any one of Claims 1-8, wherein, The guide seat (500) is provided in two positions corresponding to the inner and outer sides of the patient's teeth.

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