Shell-like dental instrument for jaw relationship adjustment

Abstract

The utility model discloses a shell -shaped dental instrument includes first shell -shaped body, first boss, second shell -shaped body, second boss, first boss includes first occlusal surface and the first action surface of inclined plane shape setting, and the first action surface is along buccal lingual and is provided with first guide portion, and first guide portion and first action surface near one end of first occlusal surface are first preset distance settings, second boss includes second occlusal surface and the second action surface of inclined plane shape setting, and the second action surface is provided with second guide portion, and second guide portion and second action surface near one end of second occlusal surface are second preset distance settings, first guide portion and second guide portion are a group of boss structure and recess structure that can concave and convex match, and first action surface and second action surface slide through first guide portion or second guide portion with linear contact mode to adjust the upper and lower jaw of patient to target position, and in target position, first guide portion and second guide portion concave and convex match.

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 shell-shaped dental instrument for adjusting jaw position. Background Technology

[0002] Malocclusion refers to imbalances in the position and relationship of teeth, dental arches, jawbones, and craniofacial structures. Common symptoms include crowded teeth, interdental spaces, and reverse overbite. Most malocclusions occur during childhood growth and development due to congenital genetic factors or acquired environmental factors such as diseases, poor oral habits, and delayed tooth eruption. Malocclusions can also develop after growth and development due to trauma, periodontal disease, etc., resulting in conditions such as misaligned teeth, abnormal occlusal relationships between the upper and lower dental arches, abnormalities in the size, shape, and position of the jawbone, and facial deformities.

[0003] Shell-shaped orthodontic appliances are devices used to treat malocclusion. They are made of safe, elastic, and transparent polymer materials, allowing the treatment process to be completed almost imperceptibly to others. For malocclusion cases involving sagittal jaw position factors, jaw position reconstruction is required to correct the jaw position, achieving mandibular anterior or posterior guidance.

[0004] Existing clear aligners for jaw reconstruction include TB (short for Twin-block, also known as double-plate appliance) and reverse TB. TB promotes mandibular growth while retracting the upper anterior teeth. It corrects the misalignment between the maxilla and mandible by functionally advancing the mandible through an adjusted occlusal incline. The masticatory muscles must guide the mandible into a protruding position to adapt to the changed occlusal balance system, typically used to guide chin protrusion. Reverse TB, on the other hand, primarily adjusts the occlusal incline to functionally inhibit mandibular advancement or actively guide it posteriorly, promoting maxillary development and thus treating underbite. Both TB and reverse TB structures aim to stabilize the positional relationship between the maxilla and mandible at a predetermined position. For example, in a dental instrument provided by Chinese patent CN201911415898.8, one embodiment sets the mesial surface of the protrusion and the distal surface of the guide to non-smooth contact. For instance, the non-smooth contact surfaces are configured with friction structures, concave-convex matching structures, or surface texture structures, so that when the patient bites, the non-smooth contact surfaces can induce the protrusion to move to the predetermined position without relative movement. However, such a non-smooth contact setting may cause the protrusion to experience obstructed movement or jamming during biting, preventing it from smoothly moving to the predetermined position and affecting the achievement of the jaw position reconstruction goal. Utility Model Content

[0005] The technical problem solved by this invention is to overcome the defects of the existing technology and provide a shell-shaped dental instrument for adjusting jaw position that can slide flexibly during biting and stabilize the bite relationship of the upper and lower jaws at the target position after biting.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A shell-shaped dental instrument for adjusting jaw position, comprising: The system comprises a first shell-shaped body for accommodating the patient's maxillary teeth and a first protrusion disposed in the posterior tooth region of the first shell-shaped body and extending toward the mandible; a second shell-shaped body for accommodating the patient's mandibular teeth and a second protrusion disposed in the posterior tooth region of the second shell-shaped body and extending toward the mandible; the first protrusion includes a first occlusal surface that contacts the opposing jaw and a first functional surface that interacts with the second protrusion, the first functional surface being an inclined plane, and a first guide portion disposed on the first functional surface along the buccal-lingual direction, the first guide portion being disposed at a first predetermined distance from the end of the first functional surface near the first occlusal surface; the second protrusion includes a second occlusal surface that contacts the opposing jaw and a second functional surface that interacts with the first protrusion, the second functional surface being an inclined plane and parallel to the first functional surface; a second functional surface is disposed on the second functional surface along the buccal-lingual direction corresponding to the position of the first guide portion. A second guide portion is provided, which is positioned at a second preset distance from the end of the second working surface near the second occlusal surface; and the first guide portion and the second guide portion are a set of protrusion and groove structures that can be matched in a concave-convex manner; when the first protrusion and the second protrusion move relative to each other, the first guide portion slides along the long axis of the second working surface in a line contact manner, or the second guide portion slides along the long axis of the first working surface in a line contact manner, so as to adjust the patient's upper and lower jaws to the target position; at the target position, the first occlusal surface and the occlusal surface at the corresponding position of the opposing jaw are in contact, the second occlusal surface and the occlusal surface at the corresponding position of the opposing jaw are in contact, and the first guide portion and the second guide portion are matched in a concave-convex manner, stabilizing the first protrusion and the second protrusion at the target position.

[0007] This application provides matching first and second guide portions on the first and second working surfaces, and sets the structure of the first or second guide portion to satisfy the following: during occlusion, the relative movement of the first and second protrusions can slide in a line contact manner. This line contact sliding reduces the frictional resistance of the first and second protrusions during movement, making the sliding process smooth and less prone to jamming, which is conducive to the smooth movement of the second protrusion to the set target position. At the target position, the first occlusal surface of the first protrusion and the occlusal surface of the second protrusion respectively match and abut with the occlusal surface of the corresponding position of the opposing jaw. Furthermore, the first and second guide portions are concave and convex at the target position, which can limit the relative torsion between the first and second protrusions along the gingival direction. Thus, through the mechanical interlocking of the concave and convex matching of the first and second guide portions, the anti-displacement and anti-torsion capabilities of the first and second protrusions can be significantly enhanced, thereby stabilizing the positional relationship of the upper and lower jaws at the target position, which is more conducive to the achievement of the orthodontic goal.

[0008] Preferably, the first protrusion is located distal to the second protrusion in the sagittal direction. The mesial surface of the first protrusion forms the first functional surface, which is inclined downwards and distally from the end near the tooth to the end near the first occlusal surface. The distal surface of the second protrusion forms the second functional surface. This arrangement is suitable for cases requiring mandibular protrusion, such as Class II malocclusion. This application clarifies the formation positions of the first and second functional surfaces through the relative positional relationship between the first and second protrusions, adapting to different malocclusion types and expanding the clinical application scope, allowing for selection and use based on different malocclusion types in clinical practice.

[0009] Preferably, the first protrusion is located mesial to the second protrusion in the sagittal direction. The distal surface of the first protrusion forms the first functional surface, which is inclined upwards and mesially from the end near the tooth towards the end near the first occlusal surface. The mesial surface of the second protrusion forms the second functional surface. This configuration is suitable for cases requiring mandibular retraction, such as Class III malocclusion. This application clarifies the formation positions of the first and second functional surfaces through the relative positional relationship between the first and second protrusions, adapting to different malocclusion types and expanding the clinical application scope, allowing for selection and use based on different malocclusion types in clinical practice.

[0010] Preferably, the outer contour shape of the boss structure is spherical, ellipsoidal, or triangular prism, and the inner contour shape of the groove structure matches the outer contour shape of the boss structure.

[0011] Preferably, the outer contour of the boss structure is spherical, the ratio of the crown height to the chord length of the crown is between 1 / 5 and 1 / 2, and the radius of the sphere is between 0.3 mm and 0.8 mm. This crown height / chord length ratio reduces the contact area and friction while meeting the stability requirements during sliding.

[0012] Preferably, the outer contour of the boss structure is an ellipsoidal crown shape, wherein the ratio of the crown height to the major axis of the base ellipse ranges from 1 / 5 to 1 / 2, and the major axis of the base ellipse ranges from 0.6 mm to 1.6 mm. This crown height / major axis ratio reduces the contact area and friction while meeting stability requirements during sliding.

[0013] Preferably, the outer contour of the boss structure is a triangular prism, and the cross-section of the triangular prism is an isosceles triangle. The included angle α between the two isosceles sides of the isosceles triangle satisfies: 60°≤α≤160°. By setting the isosceles triangle, balance and stability are ensured during the sliding process. This angle setting can take into account both the sliding stability during the sliding process and the locking stability after sliding to the target position.

[0014] Preferably, when the first guide portion is a boss structure, the second guide portion is a groove structure. The range of the first preset distance is greater than or equal to 0 and less than or equal to 1 / 2 of the length of the first working surface, and the range of the second preset distance is 1 / 2 to 1 times the length of the second working surface. Limiting the position of the first guide portion ensures that the second protrusion has sufficient line contact sliding distance during sliding, thereby reducing friction during sliding and making the sliding smoother.

[0015] Preferably, a first guide surface is provided on the side of the first guide portion near the first engagement surface to guide the second working surface to contact the first top surface of the first guide portion away from the first working surface. The first top surface is arc-shaped, and the first guide surface is a plane or arc-shaped surface that slopes upwards and forwards from the side near the first engagement surface to the side away from the first engagement surface. By providing the first guide surface, the second working surface of the second protrusion is guided along the movement direction to contact the first top surface, achieving line contact sliding of the first top surface on the second working surface. Furthermore, when the second protrusion moves to the target position, the first guide surface also guides the protrusion structure into the groove structure, making it easier for the protrusion structure to enter the groove structure.

[0016] Preferably, the curvature of the first top surface satisfies the following condition: when the first guide slides along the second working surface, the common normal at any contact point between the first top surface and the second working surface is perpendicular to the second working surface. By further defining the curvature of the first top surface, it is ensured that the first top surface maintains line contact sliding throughout the sliding process.

[0017] Preferably, the length of the second guide portion upwards from the cheek to the tongue is equal to the width of the second working surface upwards from the cheek to the tongue, and the second guide portion extends through the cheek side of the second working surface to the tongue side, forming a groove structure that runs through the cheek side of the second working surface; the length of the first guide portion upwards from the cheek to the tongue is equal to the width of the first working surface upwards from the cheek to the tongue, and the first guide portion extends through the cheek side of the first working surface to the tongue side. Through the through-groove structure, a corresponding boss structure also extends through the first working surface, ensuring a sufficiently large line contact length. This reduces frictional resistance during line contact sliding while maintaining the stability of the line contact sliding.

[0018] Preferably, the length of the second guide portion in the buccal-tongue direction is less than the width of the second working surface in the buccal-tongue direction, and a second limiting portion is provided on the buccal side and / or tongue side of the second guide portion to limit the movement of the first guide portion accommodated in the second guide portion in the buccal-tongue direction. By providing the second limiting portion, the boss structure can be further limited in the buccal-tongue direction, and the displacement of the boss structure in the buccal-tongue direction can be prevented.

[0019] Preferably, when the second guide portion is a boss structure, the first guide portion is a groove structure, the second preset distance is greater than or equal to 0 and less than or equal to 1 / 2 of the length of the second working surface, and the first preset distance is from 1 / 2 to 1 times the length of the first working surface. This application supports the interchangeability of boss structures and groove structures, providing high design flexibility and high flexibility in clinical use.

[0020] Preferably, a second guide surface is provided on the side of the second guide portion near the second engagement surface to guide the first working surface to contact the second top surface of the second guide portion on the side away from the second working surface. The second top surface is arc-shaped, and the second guide surface is a plane or arc-shaped surface that slopes downwards and backwards from the side near the second engagement surface to the side away from the second engagement surface. By providing the second guide surface, it is beneficial for the second protrusion to guide the first working surface to contact the second top surface when sliding along the movement direction, thereby achieving line contact sliding of the second top surface on the first working surface. Furthermore, when the second protrusion moves to the target position, the second guide surface can also guide the protrusion structure into the groove structure, making it easier for the protrusion structure to enter the groove structure.

[0021] Preferably, the curvature of the second top surface satisfies the following condition: when the second guide slides along the second working surface, the common normal at any contact point between the second top surface and the second working surface is perpendicular to the second working surface. By further defining the curvature of the second top surface, it is ensured that the second top surface maintains line contact sliding throughout the sliding process.

[0022] Preferably, the length of the first guide portion upwards from the cheek to the tongue is equal to the width of the first working surface upwards from the cheek to the tongue, and the first guide portion extends through the cheek side of the first working surface to the tongue side, forming a groove structure that runs through the cheek side of the first working surface; the length of the second guide portion upwards from the cheek to the tongue is equal to the width of the second working surface upwards from the cheek to the tongue, and the second guide portion extends through the cheek side of the second working surface to the tongue side. Through the through-groove structure, a corresponding boss structure also extends through the first working surface, ensuring a sufficiently long line contact length and guaranteeing the stability of the line contact sliding.

[0023] Preferably, the length of the first guide portion in the buccal-tongue direction is less than the width of the first working surface in the buccal-tongue direction, and a first limiting portion is provided on the buccal side and / or tongue side of the first guide portion to limit the movement of the second guide portion housed in the first guide portion in the buccal-tongue direction. By providing the first limiting portion, the boss structure can be further limited in the buccal-tongue direction, and the displacement of the boss structure in the buccal-tongue direction can be prevented. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of a shell-shaped dental orthodontic instrument according to Embodiment 1 of this utility model from a certain perspective; Figure 2 This is a schematic diagram of a shell-shaped dental orthodontic instrument according to Embodiment 1 of this utility model from another perspective; Figure 3 This is a schematic diagram of the structure of a first protrusion and a second protrusion in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of another type of first and second protrusion in Embodiment 1 of this utility model; Figure 5 for Figure 4 A magnified view of a portion of region A in the middle; Figure 6This is a cross-sectional schematic diagram of a boss structure in Embodiment 1 of this utility model; Figure 7 This is a cross-sectional schematic diagram of another boss structure in Embodiment 1 of this utility model; Figure 8 This is a cross-sectional schematic diagram of another boss structure in Embodiment 1 of this utility model; Figure 9 This is a schematic diagram of the structure of another first protrusion and second protrusion in Embodiment 1 of this utility model; Figure 10 This is a schematic diagram of the structure of a first protrusion and a second protrusion in Embodiment 2 of this utility model; Figure 11 This is a schematic diagram of another type of first and second protrusion in Embodiment 2 of this utility model; Figure 12 This is a schematic diagram of the structure of a shell-shaped dental orthodontic instrument in Embodiment 3 of this utility model; Figure 13 This is a schematic diagram of the structure of a first protrusion and a second protrusion in Embodiment 3 of this utility model; Figure 14 This is a schematic diagram of another type of first and second protrusion in Embodiment 3 of this utility model; Figure 15 for Figure 14 A magnified view of a portion of region B in the middle; Figure 16 This is a schematic diagram of the structure of another first protrusion and second protrusion in Embodiment 3 of this utility model; Figure 17 This is a schematic diagram of the structure of a first protrusion and a second protrusion in Embodiment 4 of this utility model; Figure 18 This is a schematic diagram of another type of first and second protrusion in Embodiment 4 of this utility model; Figure 19 This is a schematic diagram of the structure of a shell-shaped dental orthodontic instrument in Embodiment 5 of this utility model; Figure 20 This is a schematic diagram of the structure of a shell-shaped dental orthodontic instrument in Embodiment Six of this utility model. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] As described in the background art, in existing technologies, in clear aligners for jaw reconstruction, a non-smooth contact technique is used to prevent relative movement of the protrusion after it moves to a predetermined position, thus stabilizing the positional relationship between the upper and lower jaws. However, this non-smooth contact setting can lead to obstructed movement of the protrusion during occlusion, potentially causing it to become stuck. This prevents the protrusion from smoothly moving to the predetermined position, ultimately affecting the achievement of jaw reconstruction goals.

[0030] Based on this, this application provides a shell-shaped dental instrument for adjusting jaw position, comprising: a first shell-shaped body for accommodating a patient's maxillary teeth and a first protrusion disposed in the posterior tooth region of the first shell-shaped body and extending toward the mandible; a second shell-shaped body for accommodating a patient's mandibular teeth and a second protrusion disposed in the posterior tooth region of the second shell-shaped body and extending toward the mandible; the first protrusion includes a first occlusal surface that contacts the opposing jaw and a first functional surface that interacts with the second protrusion, the first functional surface being an inclined plane, and a first guide portion being disposed on the first functional surface along the buccal-lingual direction, the first guide portion being disposed at a first predetermined distance from the end of the first functional surface near the first occlusal surface; the second protrusion includes a second occlusal surface that contacts the opposing jaw and a second functional surface that interacts with the first protrusion, the second functional surface being an inclined plane and parallel to the first functional surface; the second functional surface corresponding to A second guide portion is provided at the position of the first guide portion along the buccal-lingual direction, and the second guide portion is provided at a second preset distance from the end of the second working surface near the second occlusal surface; and the first guide portion and the second guide portion are a set of protrusion and groove structures that can be matched concave and convex; when the first protrusion and the second protrusion move relative to each other, the first guide portion slides on the second working surface along the long axis of the second working surface in a line contact manner, or the second guide portion slides on the first working surface along the long axis of the first working surface in a line contact manner, so as to adjust the patient's upper and lower jaws to the target position; at the target position, the first occlusal surface and the occlusal surface at the corresponding position of the opposing jaw are in contact, the second occlusal surface and the occlusal surface at the corresponding position of the opposing jaw are in contact, and the first guide portion and the second guide portion are matched concave and convex, stabilizing the first protrusion and the second protrusion at the target position.

[0031] In this application, the first guide portion slides along the long axis of the second working surface in a line contact manner. This can be achieved by the first guide portion sliding along the long axis of the second working surface in a line contact manner throughout the entire sliding stroke. In this case, the line contact sliding distance is relatively long, and the entire sliding is relatively smooth, making it less prone to jamming. Alternatively, the first guide portion may slide along the long axis of the second working surface in a line contact manner only for a portion of the sliding stroke, which is smoother than the interlocking sliding of traditional TB or reverse TB structures. Similarly, it can be understood that the second guide portion slides along the long axis of the first working surface in a line contact manner. This can mean that the second guide portion slides along the long axis of the first working surface in a line contact manner throughout the entire sliding stroke. In this case, the line contact sliding distance is relatively long, and the entire sliding is smooth and less prone to jamming. Alternatively, the second guide portion may slide along the long axis of the first working surface in a line contact manner only for a portion of the sliding stroke, which is smoother than the interlocking sliding of traditional TB or reverse TB structures. Specifically, this will be explained through the following embodiments.

[0032] The technical solution of this application provides a matching first guide and second guide on the first and second working surfaces, and sets the structure of the first or second guide to satisfy the following: during occlusion, the relative movement of the first and second protrusions can slide in a line contact manner. This line contact sliding reduces the frictional resistance of the first and second protrusions during movement, making the sliding process smooth and less prone to jamming, which is conducive to the second protrusion moving smoothly to the set target position. At the target position, the first occlusal surface of the first protrusion and the occlusal surface of the second protrusion respectively match and abut with the occlusal surface of the corresponding position of the opposing jaw. Furthermore, the first guide and the second guide match concave and convex at the target position to achieve stable cooperation and can limit the relative torsion between the first and second protrusions along the gingival direction. Thus, through the mechanical interlocking of the concave and convex matching of the first and second guides, the anti-displacement and anti-torsion capabilities of the first and second protrusions can be significantly enhanced, thereby stabilizing the positional relationship of the upper and lower jaws at the target position, which is more conducive to the achievement of the orthodontic goal.

[0033] The following will provide a detailed explanation in conjunction with the illustrations. Example

[0034] Please refer to Figures 1 to 3 As shown, the shell-shaped dental instrument 100 for adjusting jaw position provided in this application includes a first shell-shaped body 1, a first protrusion 2, a second shell-shaped body 3, and a second protrusion 4.

[0035] The first shell-shaped body 1 is a shell that accommodates the patient's maxillary teeth. The first protrusion 2 is disposed in the posterior tooth area of ​​the first shell-shaped body 1 and protrudes toward the mandible. The first protrusion 2 includes a first occlusal surface 21 that contacts the opposing jaw and a first functional surface 22 that interacts with the second protrusion 4. The first functional surface 22 is disposed in an inclined plane. A first guide portion is disposed on the first functional surface 22 extending along the buccal-lingual direction. In this embodiment, the first guide portion is a boss structure 5. The first guide portion is disposed at a first preset distance L1 from the end of the first functional surface 22 near the first occlusal surface 21.

[0036] The second shell-shaped body 3 is a shell that accommodates the patient's mandibular teeth. The second protrusion 4 is disposed in the posterior tooth area of ​​the second shell-shaped body 3 and protrudes toward the mandible. The second protrusion 4 includes a second occlusal surface 41 that contacts the opposing jaw and a second action surface 42 that interacts with the first protrusion 2. The second action surface 42 is in the shape of an inclined plane and is arranged parallel to the first action surface 22. A second guide portion is disposed on the second action surface 42 at a position corresponding to the first guide portion along the buccal-lingual direction. In this embodiment, the second guide portion is a groove structure 6 that matches the protrusion structure 5. The second guide portion is disposed at a second preset distance L2 from the end of the second action surface 42 near the second occlusal surface 41.

[0037] It should be noted that the first preset distance L1 and the second preset distance L2 satisfy the following: when the patient wears the shell-shaped dental instrument 100 of this application and the upper and lower jaws gradually bite to the target position, the first occlusal surface 21 can contact the mandibular occlusal surface corresponding to the position of the first protrusion 2, and the second occlusal surface 41 can contact the maxillary occlusal surface corresponding to the position of the second protrusion 4.

[0038] During occlusion, the first protrusion 2 and the second protrusion 4 move relative to each other after contact, thereby adjusting the patient's upper and lower jaws to the target position. Specifically, the second protrusion 4 slides from the side of the first protrusion 2 near the first occlusal surface 21 to the side of the first protrusion 2 away from the first occlusal surface 21. In this embodiment, the first guide portion is set as a boss structure 5, and the boss structure 5 is set to slide along the long axis of the second working surface 42 in a line contact manner. The line contact sliding reduces the frictional resistance of the first protrusion 2 and the second protrusion 4 during the movement, making the sliding process smooth and less prone to jamming, which is conducive to the second protrusion 4 moving smoothly to the set target position. When the relative position of the upper and lower jaws is adjusted to the target position, the first occlusal surface 21 contacts the occlusal surface of the corresponding position of the opposing jaw, and the second occlusal surface 41 contacts the occlusal surface of the corresponding position of the opposing jaw. Furthermore, the first guide portion and the second guide portion are concave and convex, which can limit the relative torsion between the first protrusion 2 and the second protrusion 4 along the gingival direction. Thus, through the mechanical interlocking of the concave and convex matching of the first guide portion and the second guide portion, the anti-displacement and anti-torsion capabilities of the first protrusion 2 and the second protrusion 4 can be significantly enhanced, thereby stabilizing the position of the upper and lower jaws at the target position, which is more conducive to the achievement of the orthodontic goal.

[0039] To further explain, in this embodiment, the relative positional relationship between the first protrusion 2 and the second protrusion 4 is as follows: the first protrusion 2 is located distally to the second protrusion 4 in the sagittal direction, and the second protrusion 4 is located mesially to the first protrusion 2 in the sagittal direction. The mesial surface of the first protrusion 2 forms the first working surface 22, which is inclined downward and distally from the end near the tooth to the end near the first occlusal surface 21. The distal surface of the second protrusion 4 forms the second working surface 42. When the second protrusion 4 and the first protrusion 2 are in contact and occluded, the second protrusion 4 moves mesially relative to the first protrusion 2 to guide the patient's mandible forward in the sagittal direction. This is suitable for cases that require mandibular protrusion guidance, such as Class II malocclusion.

[0040] To further explain, the first preset distance L1 is greater than or equal to 0 and less than or equal to half the length of the first action surface 22, and the second preset distance L2 is between half and one times the length of the second action surface 42. In one embodiment, please refer to... Figure 3As shown, the first preset distance L1 is equal to 0, that is, the first guide part (the boss structure 5 in this embodiment) is located at the end of the first working surface 22 near the first biting surface 21; the second preset distance L2 is 1 times the length of the second working surface 42, that is, the second guide part (the groove structure 6 in this embodiment) is located at the end of the second working surface 42 away from the second biting surface 41; in this case, the distance of line contact sliding between the boss structure 5 and the second working surface 42 is the longest, that is, the first protrusion 2 and the second protrusion 4 move relative to each other in a line contact sliding manner throughout the entire process from the moment of contact to the final arrival at the target position, and the sliding is smoother.

[0041] In other embodiments, please refer to Figure 4 As shown, the first preset distance L1 is half the length of the first working surface 22, that is, the distance between the first guide part and the end of the first working surface 22 near the first engagement surface 21 is half the length of the first working surface 22; the second preset distance L2 is half the length of the second working surface 42, that is, the distance between the second guide part and the end of the second working surface 42 near the second engagement surface 41 is half the length of the second working surface 42; in this case, the line contact sliding distance between the boss structure 5 and the second working surface 42 can be guaranteed to be at least half of the total sliding distance, thereby ensuring smooth sliding between the first protrusion 2 and the second protrusion 4.

[0042] The protrusion structure 5 slides along the long axis of the second working surface 42 in a line contact manner with the second working surface 42. When the first protrusion 2 and the second protrusion 4 move relative to each other to the predetermined target position of the upper and lower jaws, the protrusion structure 5 slides into the groove structure 6, restricting the continued movement of the first protrusion 2 and the second protrusion 4, and also preventing relative twisting between the first protrusion 2 and the second protrusion 4 along the gingival direction, thereby stabilizing the patient's upper and lower jaws at the target position and achieving the purpose of jaw position reconstruction.

[0043] It is understood that the first preset distance L1 can also be any distance greater than or equal to 0 and less than or equal to 1 / 2 of the length of the first working surface 22. For example, the first preset distance L1 can be 1 / 3, 1 / 4, or 1 / 5 of the length of the first working surface 22. The smaller the first preset distance L1, the greater the line contact distance during the relative sliding of the first protrusion 2 and the second protrusion 4, and the smoother the sliding between the first protrusion 2 and the second protrusion 4.

[0044] Furthermore, during the biting process, the end of the second protrusion 4 near the second biting surface 41 first contacts the side of the first guide near the first biting surface 21. In order to guide the second working surface 42 to smoothly contact the first top surface 52 of the first guide, this application provides a first guide surface 51 on the side of the first guide near the first biting surface 21, for guiding the second working surface 42 to contact the first top surface 52 of the first guide away from the first working surface 22. The first guide surface 51 is an arc surface that is inclined upward and forward from the side near the first biting surface 21 to the side away from the first biting surface 21 (e.g., Figure 5 As shown), of course, it is understood that in other embodiments, the first guide surface 51 may also be configured as a plane that is inclined upward and forward from the side near the first occlusal surface 21 to the side away from the first occlusal surface 21.

[0045] To further explain, the first top surface 52 is provided in an arc shape, and the curvature of the first top surface 52 satisfies the following: when the first guide portion slides along the second working surface 42, the common normal at any contact point between the first top surface 52 and the second working surface 42 is perpendicular to the second working surface 42, so as to ensure that the first top surface 52 and the second working surface 42 maintain line contact sliding during the relative sliding process.

[0046] Further explanation of the boss structure 5: In some embodiments, the outer contour shape of the boss structure 5 is a spherical crown shape, and the inner contour shape of the groove structure 6 matches the outer contour shape of the boss structure 5. The larger the ratio of crown height to chord length h1 / R1, the smaller the frictional resistance during line contact sliding, but the lower the stability during sliding. Conversely, the smaller the ratio h1 / R1, the greater the stability during line contact sliding, but the greater the frictional resistance during sliding. In this application, the ratio h1 / R1 of the crown height to chord length of the spherical crown ranges from 1 / 5 to 1 / 2. Considering the limited surface area of ​​the first working surface 22, the radius of the spherical crown ranges from 0.3mm to 0.8mm. For example, in some embodiments, it can be set to 0.3mm, 0.5mm, or 0.8mm respectively. This radius range also reduces the foreign body sensation in the patient's mouth, which is beneficial to improving patient comfort. For example, please refer to... Figure 6 As shown, the cross-section of the boss structure 5 is semi-circular, the crown height h1 is the radius of the circle containing the semi-circle, the chord length R1 is the diameter of the circle containing the semi-circle, and the ratio of crown height to chord length h1 / R1 is 1 / 2; of course, in other embodiments, the ratio of crown height to chord length h1 / R1 can also be 1 / 3, 1 / 4, 1 / 5, or other ratios between 1 / 5 and 1 / 2.

[0047] In other embodiments, the outer contour of the boss structure 5 is an ellipsoidal crown shape, and the inner contour shape of the groove structure 6 matches the outer contour shape of the boss structure 5. Similar to the spherical crown shape, the larger the ratio h2 / R2 of the crown height to the major axis of the base ellipse, the smaller the frictional resistance during line contact sliding, but the lower the stability during sliding. Conversely, the smaller the ratio h2 / R2, the greater the stability during line contact sliding, but the greater the frictional resistance during sliding. In this application, the ratio h2 / R2 of the crown height to the major axis of the base ellipse ranges from 1 / 5 to 1 / 2. Considering the limited surface area of ​​the first working surface 22, the major axis of the base ellipse ranges from 0.6mm to 1.6mm. For example, in some embodiments, it can be set to 0.6mm, 1.0mm, or 1.6mm respectively. This range of the major axis of the base ellipse also reduces the foreign body sensation in the patient's mouth, thus improving patient comfort. For example, please refer to... Figure 7 As shown, the cross-section of the boss structure 5 is semi-elliptical. The crown height h2 of the ellipsoidal crown is the minor axis radius of the ellipse containing the semi-ellipse. The major axis of the base ellipse is indicated by R2. The ratio of the crown height to the major axis of the base ellipse, h2 / R2, is less than 1 / 2. Of course, in other embodiments, the ratio of the crown height to the chord length, h2 / R2, can also be 1 / 3, 1 / 4, or 1 / 5.

[0048] In some other embodiments, the outer contour shape of the boss structure 5 is a triangular prism, and the inner contour shape of the groove structure 6 matches the outer contour shape of the boss structure 5. Please refer to the following for details. Figure 8 As shown, the cross-section of the triangular prism is an isosceles triangle, and the included angle α between the two isosceles sides of the isosceles triangle satisfies: 60°≤α≤160°. For example, in some embodiments, it can be set to 60°, 100°, or 160° respectively. By setting the isosceles triangle, balance and stability are ensured during the sliding process. With such an angle setting, both sliding stability during the sliding process and locking stability after sliding to the target position can be taken into account.

[0049] For further explanation of the groove structure 6, please refer to [reference needed]. Figure 9As shown, the groove structure 6 (second guide portion) and the boss structure 5 are identical, that is, the groove structure 6 extends along the buccal-tongue direction, and the length L21 of the groove structure 6 in the buccal-tongue direction is equal to the width D21 of the second working surface 42 in the buccal-tongue direction. The groove structure 6 penetrates from the buccal side to the tongue side of the second working surface 42 in the buccal-tongue direction, forming a groove that penetrates the buccal-tongue side of the second working surface 42. Correspondingly, the length L11 of the boss structure 5 (first guide portion) in the buccal-tongue direction is also equal to the width D11 of the first working surface 22 in the buccal-tongue direction. The first guide portion also penetrates from the buccal side to the tongue side of the first working surface 22 in the buccal-tongue direction. In this application, by using the through groove structure 6, the corresponding boss structure 5 also penetrates the first working surface 22, so that when the first protrusion 2 and the second protrusion 4 slide relative to each other, the length of the line contact is large enough, thereby reducing the frictional resistance of the line contact sliding while ensuring the stability of the line contact sliding. Example

[0050] To achieve the purpose of this invention, this application also provides a shell-shaped dental instrument 100 for adjusting jaw position, please refer to [reference needed]. Figure 10 and Figure 11 As shown. The difference between this embodiment and Embodiment 1 is that the length L21 of the groove structure 6 (second guide portion) extending upwards towards the cheek and tongue is less than the width D21 of the second working surface 42 extending upwards towards the cheek and tongue. In some embodiments, such as Figure 10 As shown, the second guide portion is provided with a second limiting portion 61 on both the buccal and lingual sides. The first guide portion, which is accommodated in the second guide portion, is restricted from moving in the buccal-lingual direction on both the buccal and lingual sides. At the same time, the length L11 of the protrusion structure 5 (first guide portion) extending in the buccal-lingual direction matches the length L21 of the groove structure 6 extending in the buccal-lingual direction. That is, at the target position, the protrusion structure 5 can be accommodated in the groove structure 6, which can further limit the protrusion structure 5 in the buccal-lingual direction, prevent the protrusion structure 5 from shifting in the buccal-lingual direction, and is more conducive to the stability of the relative position relationship between the upper and lower jaws.

[0051] In other implementations, such as Figure 11As shown, a second limiting part 61 is provided only at the lingual position of the second guide part. Simultaneously, the length L11 of the protrusion structure 5 (first guide part) extending buccally and lingually in the same direction and the length L21 of the groove structure 6 extending buccally and lingually in the same direction, as well as their positions, are matched. That is, at the target position, the protrusion structure 5 can be accommodated within the groove structure 6, and the movement of the first guide part accommodated in the second guide part towards the lingual side is restricted on the lingual side. Furthermore, the second limiting part 61 on the lingual side also helps to quickly verify whether the relative position of the first guide part in the buccal-lingual direction is accurate. That is, after sliding into place, the side of the protrusion structure 5 facing the lingual side should abut against the second limiting part 61, thereby quickly determining whether the relative positional relationship of the upper and lower jaws is correct in the buccal-lingual direction, to avoid jaw deviation. If the side of the protrusion structure 5 facing the lingual side does not abut against the second limiting part 61, it can be adjusted to abut against the second limiting part 61, thus contributing to the stability of the relative positional relationship of the upper and lower jaws.

[0052] Of course, it is understood that in other embodiments, a second limiting part 61 (not shown) may be provided only at the buccal position of the second guide surface 53. Simultaneously, the length of the protrusion structure 5 (first guide part) extending buccally and lingually in the same direction as the length and position of the groove structure 6 extending buccally and lingually in the same direction are matched. That is, at the target position, the protrusion structure 5 can be accommodated within the groove structure 6, and the movement of the first guide part accommodated in the second guide part towards the buccal side is restricted on the buccal side. Furthermore, the second limiting part 61 on the buccal side also helps to quickly verify whether the relative position of the first guide part in the buccal-lingual direction is accurate. That is, after sliding into place, the buccal side of the protrusion structure 5 should abut against the second limiting part 61, thereby quickly determining whether the relative positional relationship of the upper and lower jaws is correct in the buccal-lingual direction, thus avoiding jaw deviation. If the lingual side of the protrusion structure 5 does not abut against the second limiting part 61, it can be adjusted to abut against the second limiting part 61, thereby contributing to the stability of the relative positional relationship of the upper and lower jaws.

[0053] The other technical solutions in this embodiment are the same as those in Embodiment 1. They can be used in conjunction with the technical solutions in this embodiment if they do not conflict with this embodiment. They will not be described again here. Example

[0054] To achieve the purpose of this invention, this application also provides a shell-shaped dental instrument 100 for adjusting jaw position, suitable for cases requiring mandibular protraction. Please refer to [reference needed]. Figures 12 to 16 As shown. The difference between this embodiment and Embodiment 1 is that the second guide portion is a boss structure 5, and the first guide portion is a groove structure 6.

[0055] Furthermore, the second preset distance L2 is greater than or equal to 0 and less than or equal to half the length of the second action surface 42, and the first preset distance L1 is between half and one times the length of the first action surface 22. In one embodiment, please refer to... Figure 13 As shown, the second preset distance L2 is equal to 0, that is, the second guide part (the boss structure 5 in this embodiment) is located at one end of the second working surface 42 near the second biting surface 41; the first preset distance L1 is 1 times the length of the first working surface 22, that is, the first guide part (the groove structure 6 in this embodiment) is located at one end of the first working surface 22 away from the first biting surface 21; in this case, the distance of line contact sliding between the boss structure 5 and the first working surface 22 is the longest, that is, the first protrusion 2 and the second protrusion 4 move relative to each other in a line contact sliding manner throughout the entire process from the moment of contact to the final arrival at the target position, and the sliding is smoother.

[0056] In other embodiments, please refer to Figure 14 As shown, the second preset distance L2 is half the length of the second working surface 42, that is, the distance between the second guide part and the end of the second working surface 42 near the second engagement surface 41 is half the length of the second working surface 42; the first preset distance L1 is half the length of the first working surface 22; that is, the distance between the first guide part and the end of the first working surface 22 near the first engagement surface 21 is half the length of the first working surface 22; in this case, the line contact sliding distance between the boss structure 5 and the first working surface 22 can be guaranteed to be at least half of the total sliding distance, thereby ensuring smooth sliding between the first protrusion 2 and the second protrusion 4.

[0057] The protrusion structure 5 slides along the long axis of the first working surface 22 in a line contact manner with the first working surface 22. When the first protrusion 2 and the second protrusion 4 move relative to each other to the predetermined target position of the upper and lower jaws, the protrusion structure 5 slides into the groove structure 6, restricting the continued movement of the first protrusion 2 and the second protrusion 4, and also preventing relative twisting between the first protrusion 2 and the second protrusion 4 along the gingival direction, thereby stabilizing the patient's upper and lower jaws at the target position and achieving the purpose of jaw position reconstruction.

[0058] It is understood that the second preset distance L2 can also be any distance greater than or equal to 0 and less than or equal to 1 / 2 of the length of the second working surface 42. For example, the second preset distance L2 can be 1 / 3, 1 / 4, or 1 / 5 of the length of the second working surface 42. The smaller the second preset distance L2, the greater the line contact distance during the relative sliding of the first protrusion 2 and the second protrusion 4, and the smoother the sliding between the first protrusion 2 and the second protrusion 4.

[0059] Furthermore, during the biting process, the end of the second protrusion 4 near the second biting surface 41 first contacts the side of the first guide near the first biting surface 21. In order to guide the first working surface 22 to smoothly contact the first top surface 52 of the second guide, this application provides a second guide surface 53 on the side of the second guide near the second biting surface 41, for guiding the first working surface 22 to contact the second top surface 54 of the second guide away from the second working surface 42. The second guide surface 53 is an arc surface that is inclined downward and backward from the side near the second biting surface 41 to the side away from the second biting surface 41 (e.g., Figure 15 As shown), of course, it is understood that in other embodiments, the second guide surface 53 may also be configured as a plane that is inclined downward and backward from the side near the second occlusal surface 41 to the side away from the second occlusal surface 41.

[0060] To further explain, the second top surface 54 is provided in an arc shape, and the curvature of the second top surface 54 satisfies the following: when the second guide slides along the first working surface 22, the common normal at any contact point between the second top surface 54 and the first working surface 22 is perpendicular to the first working surface 22, so as to ensure that the second top surface 54 and the first working surface 22 maintain line contact sliding during the relative sliding process.

[0061] For further explanation of the groove structure 6, please refer to [reference needed]. Figure 16As shown, the groove structure 6 (first guide portion) and the boss structure 5 are identical, that is, the groove structure 6 extends along the buccal-tongue direction, and the length L12 of the groove structure 6 in the buccal-tongue direction is equal to the width D22 of the first working surface 12 in the buccal-tongue direction. The groove structure 6 penetrates from the buccal side to the tongue side of the first working surface 22 in the buccal-tongue direction, forming a groove that penetrates the buccal-tongue side of the first working surface 22. Correspondingly, the length L22 of the boss structure 5 (second guide portion) in the buccal-tongue direction is also equal to the width D22 of the second working surface 42 in the buccal-tongue direction. The second guide portion also penetrates from the buccal side to the tongue side of the second working surface 42 in the buccal-tongue direction. In this application, by using the through groove structure 6, the corresponding boss structure 5 also penetrates the second working surface 42, so that when the first protrusion 2 and the second protrusion 4 slide relative to each other, the length of the line contact is large enough, thereby reducing the frictional resistance of the line contact sliding while ensuring the stability of the line contact sliding.

[0062] The other technical solutions in this embodiment are the same as those in Embodiment 1. They can be used in conjunction with the technical solutions in this embodiment if they do not conflict with this embodiment. They will not be described again here. Example

[0063] To achieve the purpose of this invention, this application also provides a shell-shaped dental instrument 100 for adjusting jaw position, please refer to [reference needed]. Figure 17 and Figure 18 As shown. The difference between this embodiment and Embodiment 3 is that the length L12 of the groove structure 6 (first guide portion) extending upwards towards the cheek and tongue is less than the width D12 of the first working surface 22 extending upwards towards the cheek and tongue. In some embodiments, such as Figure 17 As shown, the first guide portion is provided with a first limiting portion 62 on both the buccal and lingual sides. The second guide portion, which is accommodated in the first guide portion, is restricted from moving in the buccal-lingual direction on both the buccal and lingual sides. At the same time, the length L22 of the protrusion structure 5 (second guide portion) extending in the buccal-lingual direction matches the length L22 of the groove structure 6 extending in the buccal-lingual direction. That is, at the target position, the protrusion structure 5 can be accommodated in the groove structure 6, which can further limit the protrusion structure 5 in the buccal-lingual direction, prevent the protrusion structure 5 from shifting in the buccal-lingual direction, and is more conducive to the stability of the relative position relationship between the upper and lower jaws.

[0064] In other implementations, such as Figure 18As shown, a first limiting part 62 is provided only at the lingual position of the first guide part. Simultaneously, the length L22 of the protrusion structure 5 (second guide part) extending buccally and lingually in the same direction as the length L12 of the groove structure 6 extending buccally and lingually in the same direction, and their positions, match. That is, at the target position, the protrusion structure 5 can be accommodated within the groove structure 6, and the movement of the second guide part accommodated in the first guide part towards the lingual side is restricted on the lingual side. Furthermore, the first limiting part 62 on the lingual side also helps to quickly verify the accuracy of the relative position of the second guide part in the buccal-lingual direction. That is, after sliding into position, the side of the protrusion structure 5 facing the lingual side should abut against the first limiting part 62, thereby quickly determining whether the relative positional relationship of the upper and lower jaws is correct in the buccal-lingual direction, to avoid jaw deviation. If the side of the protrusion structure 5 facing the lingual side does not abut against the first limiting part 62, it can be adjusted to abut against the first limiting part 62, thus contributing to the stability of the relative positional relationship of the upper and lower jaws.

[0065] Of course, it is understood that in other embodiments, a first limiting part 62 (not shown) may be provided only at the buccal side of the first guiding surface 51. Simultaneously, the length of the protrusion structure 5 (second guiding part) extending buccally and lingually in the same direction as the length and position of the groove structure 6 in the same direction are matched. That is, at the target position, the protrusion structure 5 can be accommodated within the groove structure 6, and the movement of the second guiding part accommodated in the first guiding part towards the buccal side is restricted. Furthermore, the first limiting part 62 on the buccal side also helps to quickly verify whether the relative position of the second guiding part in the buccal-lingual direction is accurate. That is, after sliding into place, the side of the protrusion structure 5 facing the buccal side should abut against the first limiting part 62, thereby quickly determining whether the relative positional relationship of the upper and lower jaws is correct in the buccal-lingual direction, thus avoiding jaw deviation. If the side of the protrusion structure 5 facing the lingual side does not abut against the first limiting part 62, it can be adjusted to abut against the first limiting part 62, thereby contributing to the stability of the relative positional relationship of the upper and lower jaws.

[0066] The other technical solutions in this embodiment are the same as those in Embodiment 3. They can be used in conjunction with the technical solutions in this embodiment if they do not conflict with this embodiment. They will not be described again here. Example

[0067] To achieve the purpose of this invention, this application also provides a shell-shaped dental instrument 100 for adjusting jaw position, please refer to [reference needed]. Figure 19As shown. The difference between this embodiment and Embodiment 1 is that the relative positional relationship between the first protrusion 2 and the second protrusion 4 is as follows: the first protrusion 2 is located in the mesial direction of the second protrusion 4 in the sagittal direction, the distal surface of the first protrusion 2 forms the first working surface 22, the first working surface 22 is inclined upward and mesial from the end near the tooth to the end near the first occlusal surface 21, and the mesial surface of the second protrusion 4 forms the second working surface 42; when the second protrusion 4 and the first protrusion 2 are in contact and occlude, the second protrusion 4 moves distally relative to the first protrusion 2 to guide the patient's mandible sagittally backward, which is suitable for cases that require sagittal backward mandibular movement, such as Class III malocclusion.

[0068] The other technical solutions in this embodiment are the same as those in Embodiment 1. They can be used in conjunction with the technical solutions in this embodiment if they do not conflict with this embodiment. They will not be described again here. Example

[0069] To achieve the purpose of this invention, this application also provides a shell-shaped dental instrument 100 for adjusting jaw position, please refer to [reference needed]. Figure 20 As shown. The difference between this embodiment and Embodiment 3 is that the relative positional relationship between the first protrusion 2 and the second protrusion 4 is as follows: the first protrusion 2 is located in the mesial direction of the second protrusion 4 in the sagittal direction, the distal surface of the first protrusion 2 forms the first working surface 22, the first working surface 22 is inclined upward and mesial from the end near the tooth to the end near the first occlusal surface 21, and the mesial surface of the second protrusion 4 forms the second working surface 42; when the second protrusion 4 and the first protrusion 2 are in contact and occlude, the second protrusion 4 moves distally relative to the first protrusion 2 to guide the patient's mandible sagittally backward, which is suitable for cases that require sagittal backward mandibular movement, such as Class III malocclusion.

[0070] The other technical solutions in this embodiment are the same as those in Embodiment 3. They can be used in conjunction with the technical solutions in this embodiment if they do not conflict with this embodiment. They will not be described again here.

[0071] 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.

[0072] 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.

[0073] 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 shell-shaped dental instrument for adjusting jaw position, characterized in that, include: The system comprises: a first shell-shaped body for accommodating a patient's maxillary teeth and a first protrusion disposed in the posterior tooth region of the first shell-shaped body and extending toward the mandible; a second shell-shaped body for accommodating a patient's mandibular teeth and a second protrusion disposed in the posterior tooth region of the second shell-shaped body and extending toward the mandible; the first protrusion includes a first occlusal surface that contacts the opposing jaw and a first functional surface that interacts with the second protrusion, the first functional surface being an inclined plane, and a first guide portion disposed on the first functional surface along the buccal-lingual direction, the first guide portion being disposed at a first predetermined distance from the end of the first functional surface near the first occlusal surface; the second protrusion includes a second occlusal surface that contacts the opposing jaw and a second functional surface that interacts with the first protrusion, the second functional surface being an inclined plane and parallel to the first functional surface; a second guide portion disposed on the second functional surface along the buccal-lingual direction at a position corresponding to the first guide portion, the second guide portion being disposed at a second predetermined distance from the end of the second functional surface near the second occlusal surface; and the first guide portion and the second guide portion being a set of protrusion and groove structures capable of matching concave and convex shapes. When the first protrusion and the second protrusion move relative to each other, the first guide portion slides along the long axis of the second working surface in a line contact manner on the second working surface, or the second guide portion slides along the long axis of the first working surface in a line contact manner on the first working surface, so as to adjust the patient's upper and lower jaws to the target position. At the target position, the first occlusal surface contacts the occlusal surface at the corresponding position of the opposing jaw, the second occlusal surface contacts the occlusal surface at the corresponding position of the opposing jaw, and the first guide portion and the second guide portion are concave and convex, stabilizing the first protrusion and the second protrusion at the target position.

2. The shell-shaped dental instrument according to claim 1, characterized in that, The first protrusion is located in the sagittal direction in the distal direction of the second protrusion. The mesial side surface of the first protrusion forms the first working surface. The first working surface is inclined downward and distally arranged from the end near the tooth to the end near the first occlusal surface. The distal side surface of the second protrusion forms the second working surface.

3. The shell-shaped dental instrument according to claim 1, characterized in that, The first protrusion is located in the mesial direction of the second protrusion in the sagittal direction. The distal surface of the first protrusion forms the first working surface. The first working surface is inclined upward and mesial from the end near the tooth to the end near the first occlusal surface. The mesial surface of the second protrusion forms the second working surface.

4. The shell-shaped dental instrument according to any one of claims 1 to 3, characterized in that, The outer contour shape of the boss structure is spherical, ellipsoidal, or triangular prism, and the inner contour shape of the groove structure matches the outer contour shape of the boss structure.

5. The shell-shaped dental instrument according to claim 4, characterized in that, The outer contour of the boss structure is spherical, the ratio of the crown height to the chord length of the spherical crown is in the range of 1 / 5 to 1 / 2, and the radius of the sphere of the spherical crown is in the range of 0.3mm to 0.8mm.

6. The shell-shaped dental instrument according to claim 4, characterized in that, The outer contour of the boss structure is an ellipsoidal crown shape. The ratio of the crown height of the ellipsoidal crown to the major axis of the base ellipse ranges from 1 / 5 to 1 / 2, and the major axis of the base ellipse ranges from 0.6 mm to 1.6 mm.

7. The shell-shaped dental instrument according to claim 4, characterized in that, The outer contour of the boss structure is a triangular prism, and the cross-section of the triangular prism is an isosceles triangle. The included angle α between the two isosceles sides of the isosceles triangle satisfies: 60°≤α≤160°.

8. The shell-shaped dental instrument according to any one of claims 1 to 3, characterized in that, When the first guide part is a boss structure, the second guide part is a groove structure, the range of the first preset distance is greater than or equal to 0 and less than or equal to 1 / 2 of the length of the first working surface, and the range of the second preset distance is from 1 / 2 to 1 times the length of the second working surface.

9. The shell-shaped dental instrument according to claim 8, characterized in that, The first guide portion has a first guide surface on the side near the first occlusal surface to guide the second working surface to contact the first top surface of the first guide portion away from the first working surface. The first top surface is arc-shaped, and the first guide surface is a plane or arc surface that is inclined upward and forward from the side near the first occlusal surface to the side away from the first occlusal surface.

10. The shell-shaped dental instrument according to claim 9, characterized in that, The curvature of the first top surface satisfies the following condition: when the first guide slides along the second working surface, the common normal at any contact point between the first top surface and the second working surface is perpendicular to the second working surface.

11. The shell-shaped dental instrument according to claim 8, characterized in that, The length of the second guide portion in the buccal-tongue direction is equal to the width of the second working surface in the buccal-tongue direction. The second guide portion extends from the buccal side to the lingual side of the second working surface in the buccal-tongue direction, forming a groove structure that extends through the buccal-tongue side of the second working surface. The length of the first guide portion in the buccal-tongue direction is equal to the width of the first working surface in the buccal-tongue direction. The first guide portion extends from the buccal side to the lingual side of the first working surface in the buccal-tongue direction.

12. The shell-shaped dental instrument according to claim 8, characterized in that, The length of the second guide portion in the buccal-tongue direction is less than the width of the second working surface in the buccal-tongue direction. The buccal side and / or lingual side of the second guide portion are provided with a second limiting portion to restrict the movement of the first guide portion contained in the second guide portion in the buccal-tongue direction.

13. The shell-shaped dental instrument according to any one of claims 1 to 3, characterized in that, When the second guide part is a boss structure, the first guide part is a groove structure, the range of the second preset distance is greater than or equal to 0 and less than or equal to 1 / 2 of the length of the second working surface, and the range of the first preset distance is from 1 / 2 to 1 times the length of the first working surface.

14. The shell-shaped dental instrument according to claim 13, characterized in that, The second guide portion is provided with a second guide surface on the side near the second occlusal surface to guide the first working surface to contact the second top surface of the second guide portion on the side away from the second working surface. The second top surface is provided in an arc shape, and the second guide surface is a plane or arc surface that is inclined downward and backward from the side near the second occlusal surface to the side away from the second occlusal surface.

15. The shell-shaped dental instrument according to claim 14, characterized in that, The curvature of the second top surface satisfies the following condition: when the second guide slides along the second working surface, the common normal at any contact point between the second top surface and the second working surface is perpendicular to the second working surface.

16. The shell-shaped dental instrument according to claim 14, characterized in that, The length of the first guide portion in the buccal-tongue direction is equal to the width of the first working surface in the buccal-tongue direction. The first guide portion extends from the buccal side to the lingual side of the first working surface in the buccal-tongue direction, forming a groove structure that runs through the buccal-tongue side of the first working surface. The length of the second guide portion in the buccal-tongue direction is equal to the width of the second working surface in the buccal-tongue direction. The second guide portion extends from the buccal side to the lingual side of the second working surface in the buccal-tongue direction.

17. The shell-shaped dental instrument according to claim 16, characterized in that, The length of the first guide portion in the buccal-tongue direction is less than the width of the first working surface in the buccal-tongue direction. The buccal side and / or tongue side of the first guide portion are provided with a first limiting portion to restrict the movement of the second guide portion housed in the first guide portion in the buccal-tongue direction.

Images