Jaw position adjustment and shell-like appliance for mandibular repositioning

Abstract

The utility model relates to the field of oral clinical orthodontics, disclose a jaw position adjustment unit, the jaw position adjustment unit sets up in canine lingual side, to the jaw protrudes, the jaw position adjustment unit includes the guide surface that extends out from canine lingual side to the corresponding position of the jaw tooth lingual side, the guide surface includes horizontal guide surface and sagittal guide surface, when occlusion, the horizontal guide surface and the lingual side of the opposite jaw tooth at least partial contact, provide the repositioning force for the lower jaw to reduce the horizontal movement of the lower jaw, the sagittal guide surface and the distal end and / or mesial end of the lingual side of the opposite jaw tooth at least partial contact, provide the repositioning force for the lower jaw to reduce the sagittal movement of the lower jaw, to make the lower jaw be positioned to the preset target position. The utility model discloses a shell-shaped appliance for the repositioning of the lower jaw, so that the patient can wear respectively in horizontal and sagittal jaw position stability.

Description

Technical Field

[0001] This application relates to the field of clinical orthodontics, and in particular to a jaw position adjustment device and a shell-shaped appliance for mandibular repositioning. Background Technology

[0002] Shell-shaped orthodontic appliances are a type of orthodontic device made of safe, elastic, transparent polymer material. They offer advantages such as complete invisibility during treatment, aesthetic appeal, ease of use, and convenient oral hygiene. Furthermore, their transparency and attractiveness allow the treatment process to be completed almost imperceptibly, making them a popular choice for orthodontic patients. The fabrication process involves first creating a shell-shaped dental instrument for the patient. Then, a film is pressed onto the shell-shaped instrument using air pressure to create the corresponding shell-shaped appliance. The principle behind shell-shaped orthodontic appliances is that, after being worn, they wrap around the tooth crown, allowing the elastic deformation of the appliance material to apply a designed orthodontic force to the teeth, thus correcting malocclusion using biomechanical principles.

[0003] For Class II malocclusions such as tooth misalignment and crossbite, current techniques often employ Herbst, Twin Block, and flat guides for jaw position adjustment. For example, patent CN211583589U uses a structure with the functional orthodontic effect of Herbst on the buccal side of the posterior teeth region of the appliance. The interaction of the upper and lower jaw structures adjusts the relative position of the upper and lower jaws. However, Herbst can easily rub against the patient's oral cavity walls, causing damage. Another example is patent CN211067108U, which uses a guide plate connected to the shell-like appliance at or near the gingival margin on the lingual side of the anterior teeth region. During occlusion, the guide plate contacts the mandibular anterior teeth region and guides the mandible to move and open the posterior teeth occlusion. However, because the flat guide is located at or near the gingival margin on the lingual side of the anterior teeth region of the shell-like appliance, it can easily affect the patient's pronunciation during social interactions. Furthermore, after the upper and lower jaws reach the target position during jaw position adjustment, occlusion instability is common, which is not conducive to jaw position reconstruction.

[0004] Therefore, it is necessary to develop a new jaw position adjustment structure to avoid the aforementioned problems of existing technologies. Utility Model Content

[0005] To address the aforementioned technical problems, the purpose of this application is to provide a jaw position adjustment unit, a shell-shaped orthodontic appliance, a method for preparing the appliance, and a design method for a dental model. The jaw position adjustment unit, located on the canine, can stabilize the jaw position in both the horizontal and sagittal directions. Furthermore, its position is set on the lingual side of the canine, which greatly reduces the patient's foreign body sensation in the mouth and potential damage.

[0006] An embodiment of this application provides a jaw position adjustment part, which is disposed on the lingual side of the canine and protrudes toward the opposing jaw. The jaw position adjustment part includes a guide surface extending from the lingual side of the canine to the lingual side of the corresponding tooth in the opposing jaw. The guide surface guides the mandible to be positioned to a preset target position when the mandible and mandible are occluded. The guide surface includes a horizontal guide surface and a sagittal guide surface. When the mandible and mandible are occluded, the horizontal guide surface is at least partially in contact with the lingual side of the opposing tooth to restrict the horizontal movement of the mandible. The sagittal guide surface is at least partially in contact with the distal and / or mesial ends of the lingual side of the opposing tooth to restrict the sagittal movement of the mandible.

[0007] Compared to existing technologies, this application stabilizes the position of the opposing dentition by using a jaw position adjustment unit located at the canine. Simultaneously, the structure protruding towards the opposing dentition guides the dentition during occlusion, gradually guiding the jaw to its accurate position as the upper and lower dentition close. Furthermore, since the jaw position adjustment unit is located at the canine, which is situated at the bend of the dental arch curve, it can accommodate both horizontal and sagittal positioning. Further, by providing horizontal and sagittal guiding surfaces, the opposing dentition is guided more accurately to its target position in both the horizontal and sagittal directions, ultimately achieving precise positioning. Therefore, the jaw position adjustment unit in this application, located at the canine, can stabilize the jaw position in both the horizontal and sagittal directions, improving orthodontic outcomes. Moreover, its location on the lingual side of the canine significantly reduces the patient's foreign body sensation in the mouth and potential injury.

[0008] Optionally, the guiding surface is formed by extending from the lingual fossa of the canine toward the lingual side of the opposing tooth.

[0009] Optionally, the horizontal guiding surface is planar, and / or the sagittal guiding surface is planar. The horizontal guiding surface and the sagittal guiding surface are used to guide and restrict the jaw position of the opposing jaw, guiding the opposing jaw to move to a preset target position.

[0010] Optionally, the projection of the horizontal guide surface onto the horizontal plane is set at a first predetermined angle with the projection of the canine in the mesiodistal direction onto the horizontal plane, and the range of the first predetermined angle is 15°~80°.

[0011] Optionally, the projection of the sagittal guiding surface onto the horizontal plane and the projection of the canine buccal-lingual direction onto the horizontal plane are set at a second predetermined angle, the second predetermined angle being in the range of 15°~90°.

[0012] Optionally, the guide surface is curved, and when it contacts the opposing tooth, the contours at the contact point at which they meet at least partially match. The projection of the distal end of the guide surface onto the horizontal plane is further away from the tooth corresponding to the guide surface than the projection of the proximal end of the guide surface onto the horizontal plane. The curved structure of the guide surface reduces abrupt changes in position during guidance, resulting in a smoother guide path. During occlusion, the opposing tooth is gradually guided to the target position by the guide surface without the user's notice.

[0013] Optionally, the guiding surface at least near the tooth tip matches the lingual contour surface of the tooth at the corresponding position of the opposing tooth. By matching with the corresponding tooth of the opposing tooth, the guiding and restraining effect on the opposing jaw is better, and the jaw position is stabilized after reaching the preset target position.

[0014] Optionally, the distal end of the horizontal guiding surface is connected to the proximal end of the sagittal guiding surface; or, the proximal end of the horizontal guiding surface is connected to the proximal end of the sagittal guiding surface; or, the sagittal guiding surface includes a first sagittal guiding surface disposed at the distal end of the horizontal guiding surface and a second sagittal guiding surface disposed at the proximal end of the horizontal guiding surface, wherein the distal end of the horizontal guiding surface is connected to the proximal end of the first sagittal guiding surface, and the proximal end of the horizontal guiding surface is connected to the distal end of the second sagittal guiding surface.

[0015] Optionally, the guide surface further includes an extended occlusal surface disposed between the occlusal surface of the corresponding tooth of the occlusion and the horizontal guide surface, wherein the contour of the extended occlusal surface at least partially matches the contour of the occlusal surface of the opposing tooth. The matching of the extended occlusal surface with the occlusal surface of the opposing tooth helps to restrict the horizontal and sagittal movement of the opposing tooth.

[0016] Optionally, the minimum distance between the extended occlusal surface and the occlusal surface of the corresponding tooth in the vertical direction is greater than or equal to 3mm. The jaw position is adjusted vertically upward by the thickness of the extended occlusal surface, so that the opposing jaw is moved to a preset target position.

[0017] Optionally, the extended occlusal surface at least partially covers the lateral incisor in the mesial direction, and / or at least partially covers the first premolar in the distal direction. The extension of the occlusal surface in the mesiodistal direction stabilizes the jaw position after opening the bite.

[0018] Optionally, the guide surface of the jaw adjustment portion may at least partially cover the lateral incisor in the mesial direction, and / or the guide surface may at least partially cover the first premolar in the distal direction, thereby sharing the occlusal force by extending to the lateral incisor and the first premolar.

[0019] Optionally, the length of the jaw position adjustment part gradually narrows from the mesial end to the distal end in the mesiodistal direction, and / or the thickness of the jaw position adjustment part gradually decreases from the mesial end to the distal end in the buccal-lingual direction. This structure increases the stiffness and bending resistance of the jaw position adjustment part.

[0020] Optionally, the guide surface is positioned at a vertically upward height such that, during occlusion, it covers the neck of the mandibular canine to effectively stabilize the mandibular position.

[0021] Optionally, the lingual surface of the jaw position adjustment part is planar and is inclined from the distal end of the guide surface toward the gingiva of the corresponding tooth.

[0022] Optionally, the lingual side of the jaw position adjustment part is provided with a locally protruding and / or locally concave reinforcing ridge extending vertically to prevent the jaw position adjustment part from collapsing or deforming.

[0023] Optionally, the number of jaw adjustment parts is equal to 2, and they are symmetrically arranged relative to the tooth midline to ensure occlusal stability.

[0024] Embodiments of this application also provide a shell-shaped orthodontic appliance for mandibular repositioning, comprising a shell-shaped body, the shell-shaped body including at least one of the jaw position adjustment parts, the jaw position adjustment parts being disposed at a position on the lingual side of the canine corresponding to the shell-shaped body.

[0025] Optionally, the jaw adjustment part and the shell-shaped body are integrally formed or fixedly connected.

[0026] Optionally, the jaw position adjustment part and the shell-shaped body are fixedly connected; the jaw position adjustment part is provided with a mounting part on the side near the shell-shaped body, and the shell-shaped body is provided with a mounting hole at the position corresponding to the jaw position adjustment part. The mounting part passes through the mounting hole and is held in place on the inner surface of a portion of the shell-shaped orthodontic appliance around the mounting hole; or, the shell-shaped body has a mounting platform for mounting the jaw position adjustment part. The mounting platform is integrally formed with the shell-shaped body and protrudes from the outer surface of the shell-shaped orthodontic appliance. The jaw position adjustment part is bonded to the shell-shaped orthodontic appliance by the mounting platform on the shell-shaped body, which facilitates mass production.

[0027] Optionally, the shell-like body has a plurality of cavities for accommodating teeth, and at least one cavity for accommodating teeth applies orthodontic force to the teeth it accommodates.

[0028] Optionally, it further includes a protrusion disposed on the occlusal surface of the posterior tooth region of the shell-shaped body and extending toward the opposing jaw. The height of the protrusion satisfies the condition that, during occlusion, the upper and lower jaws are opened vertically upward to a predetermined height. Optionally, the mesial end of the protrusion and the distal end of the jaw position adjustment part are spaced apart to ensure that the protrusion and the jaw position adjustment part do not interfere with each other.

[0029] Optionally, the jaw position adjustment part has an extended occlusal surface, the minimum distance between the extended occlusal surface and the occlusal surface of the corresponding tooth of the main jaw in the vertical upward direction is basically the same as the minimum distance between the surface of the protrusion facing the opposing jaw and the corresponding tooth of the main jaw, so that the jaw position adjustment part and the protrusion share the occlusal force of the posterior teeth during biting. Attached Figure Description

[0030] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0031] Figure 1 This is a schematic diagram showing the positional relationship between the jaw position adjustment part and the teeth in one embodiment of the present invention;

[0032] Figure 2 This is an anatomical diagram of a canine in one embodiment of the present invention;

[0033] Figure 3 This is an anatomical diagram of the jaw position adjustment part disposed in the buccal-lingual direction of the canine in one embodiment of the present invention;

[0034] Figure 4 A schematic diagram showing the positional relationship between the jaw position adjustment part and the opposing tooth during occlusion in one embodiment of this utility model;

[0035] Figure 5 This is a schematic diagram showing the positional relationship between the jaw position adjustment part and the opposing tooth during biting in one embodiment of the present invention;

[0036] Figure 6 This is a lingual view schematic diagram of the relationship between the jaw position adjustment part structure and the tooth position in some other embodiments of the present invention.

[0037] Figure 7 This is a schematic diagram of the positional relationship between the jaw adjustment part and the teeth in some other embodiments of the present invention from an oblique perspective;

[0038] Figure 8 This is a lingual schematic diagram of the jaw position adjustment part with a reinforcing ridge in some other embodiments of the present invention;

[0039] Figure 9This is a side view of the jaw position adjustment part provided in Embodiment 2 of the present invention;

[0040] Figure 10 This is a lingual view schematic diagram of the relationship between the jaw position adjustment part structure and the tooth position in some other embodiments of the present invention.

[0041] Figure 11 This is a schematic diagram of the jaw adjustment unit assembled via an installation platform according to Embodiment 3 of the present invention;

[0042] Figure 12 This is a schematic diagram of the jaw adjustment part assembled via the mounting part in some other embodiments of the present invention;

[0043] Figure 13 A side view schematic diagram illustrating the positional relationship between the jaw position adjustment part and the protrusion part and the teeth provided in Embodiment 4 of this utility model;

[0044] Figure 14 This is a top view schematic diagram showing the positional relationship between the jaw position adjustment part and the protrusion part and the teeth provided in Embodiment 4 of this utility model;

[0045] Figure 15 A flowchart illustrating the design method of the dental model provided in Embodiment 5 of this utility model. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages 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 this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0047] In this embodiment of the invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0048] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0049] Furthermore, the terms "installation," "setting," "equipped with," "opening," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0050] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0051] The terms "anterior region" and "posterior region" mentioned in the various embodiments of this application are defined according to the classification of teeth in the 2nd edition of *Introduction to Stomatology*, published by Peking University Medical Press, pages 36-38. These include 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 region. Teeth in the anterior region include the central incisors, lateral incisors, and canines.

[0052] The inventors of this application have discovered that existing technologies, by placing structures with Herbst-like functional orthodontic effects on the buccal side of the posterior teeth region of the orthodontic appliance, are prone to scraping against the patient's oral cavity walls, causing damage. Furthermore, because the guide is located on or near the gingival margin on the lingual side of the shell-shaped appliance in the anterior teeth region, it can easily affect the patient's pronunciation during social interactions. Therefore, a jaw position adjustment unit is proposed, located on the lingual side of the canines and protruding towards the opposing jaw. The jaw position adjustment unit includes a guide surface extending from the lingual side of the canines towards the lingual side of the corresponding opposing teeth, allowing the opposing dentition to be more accurately guided to the target position and ultimately precisely positioned. Moreover, its location on the lingual side of the canines significantly reduces the patient's foreign body sensation in the mouth and potential damage.

[0053] The following details the implementation of the jaw position adjustment part in this application. The following details are provided for ease of understanding and are not necessary for implementing this solution.

[0054] Example 1

[0055] See details Figures 1-5As shown, this embodiment provides a jaw position adjustment part 100 for providing a repositioning force to the mandible to reduce horizontal and sagittal movement of the mandible, so that the mandible is positioned to a preset target position. The jaw position adjustment part is disposed on the lingual side of the canine and protrudes towards the opposing tooth. The jaw position adjustment part includes a guide surface extending from the lingual side of the canine to the lingual side of the corresponding tooth of the opposing tooth. The guide surface guides the mandible to be positioned to the preset target position during maxillary and mandibular occlusion. The target position is usually obtained based on the doctor's opinion or the designer's experience, and can be the jaw position based on the ideal occlusal relationship of classical anatomical standards. In the first embodiment of this application, the guide surface specifically includes a horizontal guide surface and a sagittal guide surface. During occlusion, the horizontal guide surface is at least partially in contact with the lingual side of the opposing tooth to limit the horizontal movement of the mandible, and the sagittal guide surface is at least partially in contact with the distal and / or mesial ends of the lingual side of the opposing tooth to limit the sagittal movement of the mandible.

[0056] In some embodiments, by Figure 2 and Figure 3 As shown, the guiding surface extends from the lingual fossa 1110 of the maxillary canine 111 towards the lingual side of the opposing tooth. This location was chosen as the starting point of the guiding surface because the lingual fossa 1110 of the maxillary canine is a natural depression on its lingual surface. The lingual fossa includes the mesial lingual fossa and the distal lingual fossa, possessing suitable depth and shape, allowing it to contact the mandibular teeth first during biting movements, thus stabilizing the mandibular dentition. In practical applications, it can also be located at the same height as the lingual fossa.

[0057] Based on this, this embodiment stabilizes the position of the opposing dentition by using a jaw position adjustment unit located at the canine. Simultaneously, the structure protruding towards the opposing dentition guides the dentition during occlusion, gradually guiding the jaw position to the accurate position as the upper and lower dentition close. Since the jaw position adjustment unit is located at the canine, which is situated at the bend of the dental arch curve, it can accommodate both horizontal and sagittal positioning. Furthermore, horizontal and sagittal guiding surfaces are provided, guiding the opposing dentition to the target position in both horizontal and sagittal directions, ultimately ensuring accurate positioning. Therefore, the jaw position adjustment unit in this application, located at the canine, can stabilize the jaw position in both horizontal and sagittal directions, improving orthodontic results. Moreover, its location on the lingual side of the canine significantly reduces the patient's foreign body sensation and potential injury.

[0058] For ease of explanation, a dental model is used as an example to illustrate the relationship between the jaw position adjustment part and the tooth position in this embodiment. It can be understood that in actual applications, the jaw position adjustment part can be set on the lingual side of the teeth inside the mouth.

[0059] In some embodiments, a jaw position adjustment part 100 is disposed on the lingual surface of teeth 2-4 11 of the maxillary 1. Specifically, the jaw position adjustment part 100 is disposed on the lingual surface of teeth 2-4 of the maxillary 1 (shown as 11 in the figure). The main body of the jaw position adjustment part is disposed on tooth 3 and can extend mesiodistally to form a jaw position adjustment part covering the lingual surface of teeth 2-4 11 in this embodiment. By extending to teeth 2 and 4, it shares the occlusal force. From the overall perspective of the jaw position adjustment part, it protrudes towards the opposing jaw, forming a protruding structure that can guide the mandibular teeth when the maxillary 1 and mandibular 2 perform biting actions. Its length in the mesiodistal direction gradually narrows from the mesial end to the distal end, and its thickness in the buccolingual direction gradually decreases from the mesial end to the distal end. This structure can better improve the rigidity and bending resistance of the jaw position adjustment part. It is understandable that the jaw position adjustment section may not adopt this structure, or only the length in the mesiodistal direction may gradually narrow from the mesiotodental end to the distal end, or only the thickness in the buccal-lingual direction may gradually decrease from the mesiotodental end to the distal end. Examples will not be given here.

[0060] In this embodiment, see Figure 1 As shown, the jaw position adjustment unit 100 includes a guide surface 101, which includes a horizontal guide surface 110 and a sagittal guide surface 112. The sagittal guide surface 112 further includes a first sagittal guide surface 1121 disposed at the distal end of the horizontal guide surface 110 and a second sagittal guide surface 1122 disposed at the proximal end of the horizontal guide surface 110. The distal end of the horizontal guide surface 110 is connected to the proximal end of the first sagittal guide surface 1121, and the proximal end of the horizontal guide surface is connected to the distal end of the second sagittal guide surface 1122. This structure can better stabilize the jaw position.

[0061] It should be noted that there can be only one sagittal guide surface. In this case, the mesial end of the sagittal guide surface is connected to the distal end of the horizontal guide surface, or the distal end of the sagittal guide surface is connected to the mesial end of the horizontal guide surface. This can also form positional constraints in the sagittal and horizontal directions. Although the jaw stability effect is not as good as the two sagittal guide surface structures mentioned above, it is less likely to cause jamming during occlusion, ensuring patient comfort. This will not be elaborated further here.

[0062] In this embodiment, the guide surface 101 is curved, and the contour of the guide surface 101 at the contact position with the mandibular teeth at least partially matches the contour of the corresponding opposing teeth. During occlusion, the contour of the matching portion fits against the lingual contour of the contact position with the mandibular teeth. Through the horizontal guide surface 110 and the sagittal guide surface 112 in the guide surface 101, the opposing dentition is guided more accurately to the target position in the horizontal and sagittal directions, and is ultimately accurately positioned to the target position. Furthermore, the guide surface is inclined, and the projection of the distal end of the guide surface on the horizontal plane is farther from the corresponding tooth than the projection of the proximal end of the guide surface on the horizontal plane. This reduces abrupt changes in position during the movement of the dentition, resulting in a smoother guide path. During occlusion, the opposing teeth are gradually guided to the target position by the guide surface without the user's notice, thus ensuring user comfort during the guiding operation.

[0063] In some embodiments, at least the proximal end of the contour of the guide surface at the contact position with the opposing tooth partially matches the lingual contour of the corresponding opposing tooth. In other words, the proximal end of the guide surface's contour at the contact position with the opposing tooth conforms to the lingual contour of the corresponding opposing tooth during occlusion. A higher degree of matching between the proximal end and the opposing tooth, along with the matching structure of the guide surface at the proximal end, results in a larger contact surface at the proximal end during occlusion. This means that when the upper and lower teeth are in contact and a stable occlusion is achieved, the contact surface with the proximal end of the opposing tooth is larger, leading to more stable occlusion. The guide surface is arc-shaped at the distal end, and this arc surface provides guidance while preventing interference or jamming during occlusion.

[0064] like Figure 6 As shown, the guide surface 101 at a vertically upward height h satisfies the following condition: during occlusion, the jaw position adjustment part can cover the neck position of the second mandibular tooth to ensure effective stabilization of the mandibular position. That is, the jaw position adjustment part covers 1 / 2 to 2 / 3 of the second mandibular tooth.

[0065] In some embodiments, see Figure 6 and Figure 7 As shown, the lingual surface of the jaw position adjustment part 100 is a support surface 102. In this embodiment, the support surface 102 is a plane, inclined from the distal end of the guide surface 101 toward the gingival direction of the corresponding tooth. It provides support for the jaw position adjustment part during occlusion. Extending from the gingival direction of the corresponding maxillary tooth, it ensures the thickness of the jaw position adjustment part in the buccal-lingual direction, preventing the jaw position adjustment part from deforming or collapsing due to insufficient thickness to withstand occlusal forces.

[0066] The angle between the support surface 102 and the horizontal plane ranges from 20° to 85°, such as 30°, 45°, or 70°. In this embodiment, the angle between the support surface 102 and the horizontal plane is 61°. The larger the angle between the support surface 102 and the horizontal plane, the steeper the support surface, which is prone to sudden positional changes when guiding the movement of the dentition, resulting in poor comfort but better stabilization and restraint of the opposing jaw. However, the smaller the angle, the gentler the support surface, which ensures comfort, but because the support surface 102 is the lingual side of the jaw position adjustment part 100, a smaller angle will increase the lateral space occupied by the support surface, affecting the patient's tongue movement space and impacting patient comfort. In this embodiment, the angle between the support surface and the horizontal plane is set to 20° to 85°, which avoids sudden positional changes when guiding the movement of the dentition, does not affect the patient's tongue comfort, and also ensures the effect of restraining and stabilizing the opposing jaw position.

[0067] In some embodiments, the support surface 102 is curved and convex toward the tongue side to increase rigidity and bending resistance, so as to avoid deformation or collapse of the jaw position adjustment part.

[0068] In some embodiments, the support surface 102 is provided with a reinforcing ridge 1021 that extends vertically through the support surface 102 and is concave inward, such as... Figure 8 As shown. A reinforcing ridge is incorporated to prevent excessive occlusal force on the jaw adjustment mechanism during biting, which could lead to deformation or collapse and affect treatment outcomes. Because the reinforcing ridge is concave, it increases the gap between the tongue and the support surface, reducing their contact and increasing patient comfort, thus improving patient compliance.

[0069] It should be noted that, in addition to the reinforcing ridges that penetrate the jaw position adjustment part and are concave inward as listed above, the jaw position adjustment part can also adopt various other forms, such as: the reinforcing ridges extending vertically and convex outward, penetrating the jaw position adjustment part, to prevent the jaw position adjustment part from deforming, tearing or collapsing. It is conceivable that, in addition to the reinforcing ridges that penetrate the support surface as listed above, reinforcing ridges or reinforcing blocks can also be locally set, which will not be listed one by one here.

[0070] In some embodiments, both the horizontal guiding surface and the sagittal guiding surface are planar. The projection of the horizontal guiding surface onto the horizontal plane forms a first predetermined angle with the projection of the canine in the mesiodistal direction onto the horizontal plane. In practical applications, the first predetermined angle can be set to any angle between 0 and 90°, such as 8°, 30°, or 75°. The projection of the sagittal guiding surface onto the horizontal plane forms a second predetermined angle with the projection of the canine in the buccal-lingual direction onto the horizontal plane. In practical applications, the second predetermined angle can be set to any value between 0 and 90°, such as 30°, 41°, or 75°.

[0071] It should be noted that the horizontal guiding surface and the sagittal guiding surface can also be any combination of two planes or curved surfaces.

[0072] In some embodiments, the jaw position adjustment part 100 and teeth 2-4 can be fixedly connected by adhesive bonding or riveting.

[0073] It is worth mentioning that, in this embodiment, two jaw position adjustment units 100 can be used, specifically arranged symmetrically relative to the tooth midline to ensure occlusal stability. Alternatively, only one unit can be used. If the jaw position difference is small or the patient has a deviated jaw, even one jaw position adjustment unit 100 can provide sagittal and horizontal positional definition, which will not be elaborated further here.

[0074] It is understood that the jaw position adjustment unit in this embodiment can be applied to cases of malocclusion. The jaw position adjustment unit 100 provides a repositioning force to the mandible and restricts the horizontal movement of the mandible during the biting of the upper and lower jaws through the horizontal guide surface 110, and provides a repositioning force to the mandible and restricts the sagittal movement of the mandible during the biting of the upper and lower jaws through the sagittal guide surface 112, thereby correcting malocclusion.

[0075] In summary, the jaw position adjustment unit 100 of Embodiment 1 guides the corresponding mandibular teeth through the horizontal guiding surface 110 and the sagittal guiding surface 112, thereby providing a repositioning force for the mandible to reduce the movement of the mandible in the horizontal and sagittal directions, so that the mandible is positioned to a preset target position to stabilize the jaw position. It can also guide and adjust and correct cases of malocclusion. It has a wide range of applications and is suitable for widespread promotion.

[0076] It is understood that, in addition to covering the positions of teeth 2-4 as mentioned above, the jaw position adjustment unit can also be set to cover the positions of teeth 2-3 or teeth 3-4, or it can be set to cover only the position of tooth 3.

[0077] Example 2

[0078] The second embodiment of this application relates to a jaw position adjustment part. The second embodiment is largely the same as the first embodiment, with the main difference being that the guide surface of the jaw position adjustment part in embodiment 1 only includes a horizontal guide surface and a sagittal guide surface. However, in the second embodiment of this application, the guide surface of the jaw position adjustment part includes a horizontal guide surface, a sagittal guide surface, and an extended occlusal surface.

[0079] See details Figure 9 and Figure 10As shown, the guide surface 101 includes a horizontal guide surface 110, a sagittal guide surface 112, and an extended occlusal surface 113. The extended occlusal surface 113 is disposed between the occlusal surface of the corresponding tooth of the mandible and the horizontal guide surface. The contour of the extended occlusal surface 113 at least partially matches the contour of the occlusal surface of the opposing tooth. That is, the matching part is equivalent to an anatomical structure, which matches the contour of the opposing tooth. The horizontal guide surface and the sagittal guide surface can guide the mandible to move horizontally and sagittally during occlusion, so that the mandible reaches the designated target position. Furthermore, the matching of the extended occlusal surface with the occlusal surface of the opposing tooth can stabilize the mandibular position while performing auxiliary positioning operations on the mandible.

[0080] In some embodiments, such as Figure 9 and Figure 10 As shown, the distance L between the extended occlusal surface 113 and the occlusal surface 13 of the corresponding tooth in the vertical direction is greater than or equal to 3 mm. It can be understood that the extended occlusal surface 113 can control the height of the bite in the vertical direction to open the bite. The vertical height of the extended occlusal surface allows for vertical jaw position adjustment of the mandible. In practical applications, the distance can also be set to any value with a minimum distance greater than or equal to 3 mm, provided that medical effectiveness and comfort are ensured. For example, it could be 3.1 mm, 3.5 mm, or 4 mm. The value is selected based on the need to open the bite. Too small a distance will be ineffective, while too large a distance may cause open bite or joint discomfort. The extended occlusal surface covers the lateral incisors mesially and the first premolar distally, opening the bite and adjusting the jaw position vertically while stabilizing the jaw position and increasing the anti-occlusal capacity of the jaw position adjustment area.

[0081] In some embodiments, the guiding surface includes both the horizontal guiding surface 110 and the sagittal guiding surface 112, which are planar. In practical applications, the horizontal guiding surface and the sagittal guiding surface can be any combination of planar or curved surfaces, and will not be listed here.

[0082] In summary, the jaw position adjustment unit of Embodiment 2 reduces the horizontal and sagittal movement of the mandible through the horizontal guiding surface, the sagittal guiding surface, and the extended occlusal surface. The extended occlusal surface opens the occlusion at a vertical height, thereby limiting the mandible in the horizontal and sagittal directions while allowing the mandible to reach the preset target position in the vertical direction. Furthermore, the jaw position is stabilized by the structure of the extended occlusal surface matching the occlusal surface of the opposing teeth.

[0083] Example 3

[0084] Example 3 provides an orthodontic appliance for mandibular repositioning, comprising a shell-shaped body, wherein the shell-shaped body includes at least one jaw position adjustment part, which is disposed on the lingual side of the canine corresponding to the position of the shell-shaped body.

[0085] The jaw position adjustment unit included in this embodiment can be the jaw position adjustment unit 100 in Embodiment 1 or 2 above. The shell-shaped body has multiple tooth storage cavities for accommodating teeth, and the number of tooth storage cavities can be consistent with the number of teeth of the user.

[0086] It should be noted that, in one embodiment, the jaw position adjustment part 100 and the shell-shaped body 10 can be integrally formed, specifically through 3D printing, hot pressing, or other methods. The connection method between the jaw position adjustment part and the shell-shaped body is described below:

[0087] In another embodiment, the jaw position adjustment part 100 and the shell-shaped body 10 are separate structures, and can be connected by a fixed connection. Please refer to [reference needed]. Figure 11 As shown, the shell-shaped orthodontic appliance has a mounting platform 14 for mounting the jaw adjustment part. The mounting platform 14 is integrally formed with the shell body and protrudes from the outer surface of the shell body. The jaw adjustment part 100 is bonded to the shell body 10 via the mounting platform 14 on the shell body 10. The mounting platform 14 is a flat surface that is easy to manufacture into an industrial standard part, so that the standard is uniform during the production process, which is convenient for mass production.

[0088] In some embodiments, the installation method can be as follows: Figure 12 As shown, a mounting part 15 is provided on one side of the jaw position adjustment part 100 near the shell-shaped body. A mounting hole is provided on the shell-shaped body corresponding to the position of the jaw position adjustment part. The mounting part passes through the mounting hole and is held in place on the inner surface of a portion of the shell-shaped body around the mounting hole.

[0089] It should be noted that in practical applications, the jaw adjustment part 100 and the shell-shaped body can also be fixedly connected by welding, bonding, or riveting. These methods will not be listed here.

[0090] Regarding the shell-like body, it can be further explained that in this embodiment, among the several cavities of the shell-like body that accommodate teeth, at least one cavity applies orthodontic force to the accommodated tooth. It is understood that multiple cavities can apply orthodontic force to the accommodated teeth; of course, orthodontic force can be applied to all cavities corresponding to the teeth to be moved. The orthodontic force can be designed according to the type and amount of tooth movement, or it can be set based on the experience of a doctor or professional designer, which will not be elaborated further here.

[0091] In summary, the orthodontic appliance for mandibular repositioning in Example 3 combines a jaw position adjustment unit with a shell-shaped body. When the patient wears the appliance in this example, the jaw position adjustment unit is immediately installed, stabilizing the position of the opposing dentition. Simultaneously, the structure protruding towards the opposing dentition guides the dentition during occlusion, gradually guiding the jaw to the accurate position during the closure of the upper and lower dentition. Furthermore, horizontal and sagittal guiding surfaces are provided, guiding the opposing dentition horizontally and sagittally to the target position, ultimately achieving accurate positioning. In addition, the shell-shaped body of the appliance can be designed to apply orthodontic force to the enclosed teeth, simultaneously aligning the teeth to be treated and guiding the mandible during occlusion through the guiding surfaces of the jaw position adjustment unit. This gradually guides the patient's mandible to the target position during the closure of the upper and lower jaws, shortening the treatment period and improving the patient experience. The jaw adjustment unit is fixedly connected to the shell-shaped body through an installation platform. The installation platform is a flat surface that is easy to manufacture into an industrial standard part, which facilitates standardization during the production process and enables large-scale production.

[0092] Example 4

[0093] Embodiment 4 of this application relates to an orthodontic appliance for mandibular repositioning. Embodiment 4 is an improvement on Embodiment 3, the main improvement being that a protrusion is added to the posterior tooth region in addition to Embodiment 3, thereby allowing the mandible to be guided more accurately vertically upward to the target position.

[0094] Since the orthodontic appliance in this embodiment is formed directly by hot pressing a dental model, and the formed shell-shaped appliance corresponds to the shape of the dental model, the shape of the orthodontic appliance is shown by displaying a schematic diagram of the dental model.

[0095] like Figure 13 and Figure 14 As shown, the mesial end of the protrusion 200 and the distal end of the jaw position adjustment part 100 are spaced apart. The protrusion 200 is located in the posterior tooth region. In this embodiment, the jaw position adjustment part 100 has an extended occlusal surface 113. The vertical height of the extended occlusal surface 113 is consistent with the vertical height of the protrusion 101, thereby ensuring jaw position stability during maxillary and mandibular occlusion.

[0096] When the upper and lower jaws bite, the protrusion is positioned on the posterior teeth. Its vertical height opens the posterior teeth occlusion, allowing for vertical adjustment of the jaw position. The jaw position adjustment section and the protrusion are spaced apart, and when they do not interfere with each other, the extended occlusal surface of the jaw position adjustment section is at least at the same vertical height as the protrusion. During occlusion, it stabilizes the jaw position and distributes the posterior occlusal force borne by the protrusion in the posterior tooth region, ensuring that the protrusion in the posterior tooth region does not deform or collapse due to excessive posterior occlusal force. The guiding surface of the jaw position adjustment section also includes a horizontal guiding surface and a sagittal guiding surface. These surfaces restrict horizontal and sagittal movement during jaw occlusion, guiding and positioning the mandible from its horizontal and sagittal positions to a preset target position.

[0097] Example 5

[0098] In some embodiments, this utility model also discloses a method for designing a dental model, such as... Figure 15 As shown, it includes:

[0099] Step S1: Obtain a digital dental model.

[0100] Specifically, a first initial digital model of the jaw is obtained, which includes a digital tooth model and a digital gingival model.

[0101] Step S2: Set up the jaw position adjustment model.

[0102] Specifically, a jaw position adjustment part extending toward the opposing jaw is provided on the lingual side of the canine of the first initial digital model of the jaw; including a guide surface extending from the lingual side of the canine to the lingual side of the corresponding tooth in the opposing jaw, the guide surface guiding the mandible to be positioned to a preset target position when the upper and lower jaws bite.

[0103] This step also includes: providing a horizontal guide surface that at least partially contacts the lingual side of the opposing tooth to restrict the horizontal movement of the mandible during maxillary occlusion; and providing a guide surface that at least partially contacts the distal and / or mesial ends of the lingual side of the opposing tooth to restrict the sagittal movement of the mandible during maxillary occlusion.

[0104] In some embodiments, the guide surface of the jaw position adjustment model is curved, and its vertical height satisfies the following condition: during occlusion, it covers the neck of the mandibular canine. When the guide surface contacts the opposing tooth, the contours at the contact point are at least partially matched. The projection of the distal end of the guide surface on the horizontal plane is farther away from the tooth corresponding to the guide surface than the projection of the proximal end of the guide surface on the horizontal plane. This reduces abrupt position changes when guiding the movement of the dentition, resulting in a smoother guide path. The anatomical structure of the guide surface near the proximal end provides a larger contact area at the proximal end during occlusion, leading to greater stability during occlusion.

[0105] In some embodiments, the guide surface of the jaw position adjustment model further includes an extended occlusal surface, which is disposed between the occlusal surface of the corresponding tooth of the mandible and the horizontal guide surface. The contour of the extended occlusal surface at least partially matches the contour of the occlusal surface of the opposing tooth. The matching of the extended occlusal surface with the occlusal surface of the opposing tooth allows for the stabilization of the mandibular position while performing auxiliary positioning operations.

[0106] In some embodiments, the minimum distance between the extended occlusal surface and the occlusal surface of the corresponding tooth in the vertical direction is greater than or equal to 3 mm. The extended occlusal surface at least partially covers the lateral incisor in the mesial direction, and / or at least partially covers the first premolar in the distal direction. This stabilizes the jaw position and increases the compressive strength of the jaw adjustment mechanism while opening the bite.

[0107] Step S3, Constructing a dental model: Combine the first initial digital dental model with the jaw position adjustment model to generate a dental model with a digital jaw position adjustment.

[0108] As can be seen, the design of a dental model with jaw position adjustment can be achieved by following steps S1-S3.

[0109] In some embodiments, a jaw position adjustment part is designed at the canine of the first initial digital model of the jaw. The process may also include: extending the jaw position adjustment part mesially and distally until the jaw position adjustment part covers the 2nd to 4th teeth of the first initial digital model of the jaw, thereby sharing the occlusal force by extending from the 3rd tooth (canine) to the 2nd and 4th teeth.

[0110] It should also be noted that in some embodiments, the dental model may also be designed with a protrusion. The protrusion is located on the posterior teeth and opens the posterior teeth occlusion by its vertical height, thereby adjusting the occlusal position of the upper and lower jaws vertically. The corresponding design method may further include: designing a protrusion model in the posterior tooth region of the first initial dental digital model; and generating a first dental digital model with a digital occlusal adjustment part and a digital protrusion based on the first initial dental digital model, the occlusal adjustment part model, and the protrusion model. Specifically, the mesial end of the protrusion and the distal end of the occlusal adjustment part are spaced apart, the protrusion is located in the posterior tooth region, and the occlusal adjustment part can share the occlusal force borne by the protrusion.

[0111] As can be seen, the design method of the dental model in this embodiment combines the jaw position adjustment unit with the dental model to design a dental model with a jaw position adjustment unit. The jaw position adjustment unit stabilizes the position of the opposing dentition, and the structure protruding towards the opposing dentition guides the dentition during occlusion, gradually guiding the jaw position to the accurate position during the closure of the upper and lower dentition. The guiding surface of the jaw position adjustment unit further includes a horizontal guiding surface and a sagittal guiding surface. Through the horizontal and sagittal guiding surfaces, the opposing dentition is guided more accurately to the target position in the horizontal and sagittal directions, and ultimately accurately positioned. This design method can be used for the fabrication of jaw position adjustment units or shell-shaped orthodontic appliances with jaw position adjustment units.

[0112] Example 6

[0113] This embodiment provides a method for manufacturing a shell-shaped orthodontic appliance. Based on the dental model in Embodiment 5, a solid dental model is produced by 3D printing. Then, a shell-shaped dental instrument containing the shape of teeth is obtained by thermoforming on the solid dental model. Finally, a shell-shaped orthodontic appliance capable of accommodating teeth is cut along the gingival line or adjacent to the gingival line on the shell-shaped dental instrument containing the shape of teeth.

[0114] It should be noted that the shell-shaped orthodontic appliance can also be made using additive manufacturing technology. A digital model of the shell-shaped orthodontic appliance is designed based on the dental model, and the digital model of the shell-shaped orthodontic appliance is printed using 3D printing.

[0115] 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.

[0116] 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 utility model, and these improvements and modifications should also be considered within the scope of protection of this application.

[0117] 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 jaw position adjustment part, characterized in that: The jaw position adjustment part is disposed on the lingual side of the canine and protrudes towards the opposing jaw. The jaw position adjustment part includes a guide surface extending from the lingual side of the canine to the lingual side of the corresponding tooth in the opposing jaw. The guide surface guides the mandible to be positioned to a preset target position when the upper and lower jaws bite. The guide surface includes a horizontal guide surface and a sagittal guide surface. When the upper and lower jaws bite, the horizontal guide surface is at least partially in contact with the lingual side of the opposing tooth to restrict the horizontal movement of the mandible. The sagittal guide surface is at least partially in contact with the distal and / or mesial ends of the lingual side of the opposing tooth to restrict the sagittal movement of the mandible.

2. The jaw position adjustment part according to claim 1, characterized in that: The guiding surface is formed by extending from the lingual fossa of the canine toward the lingual side of the opposing tooth.

3. The jaw position adjustment part according to claim 1, characterized in that: The horizontal guiding surface is planar, and / or the sagittal guiding surface is planar.

4. The jaw position adjustment part according to claim 3, characterized in that: The horizontal guide surface is set at a first predetermined angle to the horizontal plane, and the range of the first predetermined angle is 15°~80°.

5. The jaw position adjustment part according to claim 3, characterized in that: The sagittal guide surface is set at a second predetermined angle to the horizontal plane, and the range of the second predetermined angle is 15°~90°.

6. The jaw position adjustment part according to claim 1, characterized in that: The guide surface is curved. When the guide surface contacts the opposing tooth, the contours at the contact position of the two teeth at least partially match. The projection of the distal end of the guide surface on the horizontal plane is farther away from the tooth corresponding to the guide surface than the projection of the proximal end of the guide surface on the horizontal plane.

7. The jaw position adjustment part according to claim 6, characterized in that: At least the contour near the tooth tip of the guide surface at the contact point with the opposing tooth matches the lingual contour of the corresponding tooth at the opposing position.

8. The jaw position adjustment part according to any one of claims 1-7, characterized in that: The distal end of the horizontal guiding surface is connected to the proximal end of the sagittal guiding surface, or... The proximal end of the horizontal guiding surface is connected to the proximal end of the sagittal guiding surface, or... The sagittal guiding surface includes a first sagittal guiding surface disposed at the distal end of the horizontal guiding surface and a second sagittal guiding surface disposed at the proximal end of the horizontal guiding surface. The distal end of the horizontal guiding surface is connected to the proximal end of the first sagittal guiding surface, and the proximal end of the horizontal guiding surface is connected to the distal end of the second sagittal guiding surface.

9. The jaw position adjustment part according to claim 1, characterized in that: The guide surface further includes an extended occlusal surface, which is disposed between the occlusal surface of the corresponding tooth of the occlusion and the horizontal guide surface, and the contour of the extended occlusal surface at least partially matches the contour of the occlusal surface of the opposing tooth.

10. The jaw position adjustment part according to claim 9, characterized in that: The minimum distance between the extended occlusal surface and the occlusal surface of the corresponding tooth of the main jaw in the vertical direction is greater than or equal to 3 mm.

11. The jaw position adjustment part according to claim 10, characterized in that: The extended occlusal surface at least partially covers the lateral incisor in the mesial direction, and / or, the extended occlusal surface at least partially covers the first premolar in the distal direction.

12. The jaw position adjustment part according to claim 1, characterized in that: The guide surface of the jaw adjustment portion at least partially covers the lateral incisor in the mesial direction, and / or at least partially covers the first premolar in the distal direction.

13. The jaw position adjustment part according to claim 1, characterized in that: The length of the jaw position adjustment part in the mesiodistal direction gradually narrows from the mesial end to the distal end, and / or the thickness of the jaw position adjustment part in the buccal-lingual direction gradually decreases from the mesial end to the distal end.

14. The jaw position adjustment part according to claim 1, characterized in that: The guide surface is positioned vertically upwards to cover the neck of the mandibular canine during occlusion.

15. The jaw position adjustment part according to claim 1, characterized in that: The lingual side of the jaw position adjustment part is flat and is inclined from the distal end of the guide surface toward the gingiva of the corresponding tooth.

16. The jaw position adjustment part according to claim 15, characterized in that: The lingual side of the jaw position adjustment part is provided with a reinforcing ridge that extends vertically and is partially convex and / or partially concave.

17. The jaw position adjustment part according to claim 1, characterized in that: The number of jaw position adjustment parts is equal to 2, and they are symmetrically arranged relative to the tooth midline.

18. A shell-shaped orthodontic appliance for mandibular repositioning, characterized in that: The shell-shaped body includes at least one jaw position adjustment part as claimed in any one of claims 1-17, the jaw position adjustment part being disposed at a position on the lingual side of the canine corresponding to the shell-shaped body.

19. The shell-shaped orthodontic appliance for mandibular repositioning according to claim 18, characterized in that: The jaw adjustment part and the shell-shaped body are integrally formed or fixedly connected.

20. The shell-shaped orthodontic appliance for mandibular repositioning according to claim 19, characterized in that: The jaw position adjustment part is fixedly connected to the shell-shaped body; A mounting portion is provided on one side of the jaw position adjustment part near the shell-shaped body. A mounting hole is provided on the shell-shaped body at a position corresponding to the jaw position adjustment part. The mounting portion passes through the mounting hole and is held against the inner surface of a portion of the shell-shaped orthodontic appliance around the mounting hole; or... The shell-shaped body has a mounting platform for mounting the jaw adjustment part. The mounting platform is integrally formed with the shell-shaped body and protrudes from the outer surface of the shell-shaped orthodontic appliance. The jaw adjustment part is attached to the shell-shaped orthodontic appliance by bonding it to the mounting platform on the shell-shaped body.

21. The shell-shaped orthodontic appliance for mandibular repositioning according to claim 18, characterized in that: The shell-like body has several cavities for accommodating teeth, and at least one cavity for accommodating teeth applies orthodontic force to the teeth it accommodates.

22. The shell-shaped orthodontic appliance for mandibular repositioning according to any one of claims 18-21, characterized in that: It also includes a protrusion disposed on the occlusal surface of the posterior tooth region of the shell-shaped body and protruding toward the opposing jaw, the height of the protrusion satisfying that, during biting, the upper and lower jaws are opened vertically upward to a predetermined height.

23. The shell-shaped orthodontic appliance for mandibular repositioning according to claim 22, characterized in that: The proximal end of the protrusion and the distal end of the jaw position adjustment part are spaced apart.

24. The shell-shaped orthodontic appliance for mandibular repositioning according to claim 23, characterized in that: The jaw position adjustment part is the jaw position adjustment part in claim 10. The minimum distance between the extended occlusal surface and the occlusal surface of the corresponding tooth of the main jaw in the vertical upward direction and the minimum distance between the surface of the protrusion facing the opposing jaw and the corresponding tooth of the main jaw are basically the same, so that the jaw position adjustment part and the protrusion share the occlusal force of the posterior teeth during biting.

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