Extraoral arch and dental correction system

Abstract

The utility model discloses an extraoral arch which comprises an inner arch located in the mouth of a patient and an outer arch connected with the inner arch and located outside the mouth of the patient, the inner arch comprises an inner arch body, connecting parts are arranged at the two ends of the inner arch body, and each connecting part comprises two inserting parts arranged in parallel. The two adjacent inserting parts are arranged at a first preset distance in the gingival-jaw direction, and the connecting parts are arranged corresponding to the position of the rear tooth area of the oral cavity of a patient during wearing; wherein the first preset distance ranges from 1 mm to 6 mm. The utility model further discloses a dental correction system. Through the arrangement of the two inserting parts, the situation that the traction direction is affected due to the fact that the extra-oral arch rotates after being installed is avoided, and the correction effect of extra-oral traction can be achieved easily.

Description

Technical Field

[0001] The utility model belongs to the field of medical devices, more precisely, to the field of orthodontic appliances for the oral cavity, and particularly relates to an extraoral arch and a dental correction system. Background Art

[0002] An extraoral orthopedic force appliance uses extraoral structures such as the head, neck, occiput, forehead, and chin as an anti-basis, and applies orthopedic force to the teeth and jaws to regulate the growth and development of the jaws, change the growth direction of the bones, and achieve the purpose of correcting dentofacial deformities. Commonly used extraoral orthopedic force appliances include headgear-extraoral arch, J-hook, maxillary protraction appliance, and headgear chincup. Among them, the headgear-extraoral arch is a device that connects the inside and outside of the oral cavity and conducts extraoral force into the oral cavity. It consists of an inner arch and an outer arch. The inner arch is connected by inserting into an intraoral correction device, and the outer arch is connected to the headgear or neck strap through a wire hook to generate a correction force. The extraoral arch has functions such as strengthening anchorage (preventing the mesial movement of molars), pushing molars distally, depressing molars, expanding or narrowing the dental arch, etc. Its greatest advantage is that it can generate a force on the teeth in the oral cavity with the support of the extraoral skull and will not generate a force on the non-target teeth.

[0003] The extraoral arch can be used alone and directly installed on the buccal side of the posterior teeth. It can also be used in combination with the increasingly popular shell-shaped tooth correction appliance and installed on the buccal side of the posterior teeth area of the shell-shaped tooth correction appliance, enabling the combined shell-shaped tooth correction appliance to achieve growth improvement of the jaws while precisely controlling and aligning the teeth. In the current prior art, when wearing and installing the extraoral arch device, the two free ends of the inner arch in the extraoral arch need to be installed on the buccal side of the posterior teeth area. Currently, a retention part is mostly provided on the buccal side of the posterior teeth area on each side, and then the two free ends of the inner arch are respectively inserted into the retention parts on the left and right sides for installation. However, the current extraoral arch is fixed only to one retention part provided on the buccal side of the posterior teeth area on the left and right sides of the patient, and is prone to up-and-down rotation, affecting the traction direction and thus the traction effect. Although there are also solutions to the problem of up-and-down rotation of the extraoral arch caused by few fixation points by providing two retention parts each in the front and back of the buccal side area of the posterior teeth area on the left and right sides of the patient, the installation is rather difficult. As can be seen in Figure 10 and Figure 11 As shown, since the distance between the distal ends on the left and right sides of the inner arch of the extraoral arch is greater than the distance between the proximal ends, when installing the inner arch, a force needs to be applied to the distal ends on the left and right sides of the inner arch for secondary deformation to insert into the two retention parts in the front and back on the left and right sides. Since the distance between the two retention parts in the front and back is small, both the application of force and the installation are of great difficulty. Summary of the Utility Model

[0004] The technical problem solved by the present utility model is to overcome the defects existing in the prior art, and provide an extraoral bow and a dental orthodontic system that can not only avoid rotation, but also be installed conveniently and quickly.

[0005] In order to achieve the above object, the technical solution adopted by the present utility model is as follows:

[0006] An extraoral bow includes an inner bow located in the patient's mouth and an outer bow located outside the patient's mouth and connected to the inner bow. The inner bow includes an inner bow body, and both ends of the inner bow body are provided with connecting parts. The connecting parts include two parallel plug-in parts, and the two plug-in parts are arranged at a first preset distance in the gingivomandibular direction. When worn, the connecting parts are arranged corresponding to the position of the posterior teeth area of the patient's oral cavity; wherein, the first preset distance is 1 mm - 6 mm.

[0007] Preferably, the inner bow body includes a first connecting piece connected to the outer bow, a second connecting piece connected to the connecting part, and a transition piece arranged between the first connecting piece and the second connecting piece and extending towards the occlusal surface in the anterior tooth area. The distal middle end of the first connecting piece and the proximal middle end of the second connecting piece are respectively connected to both ends of the transition piece, and the whole is in a "Z" shape. Among them, the first preset distance is 1 mm - 2 mm.

[0008] Preferably, the midpoints of the two plug-in parts in the mesiodistal direction are on the same straight line in the gingivomandibular direction.

[0009] Preferably, the cross-sectional shape of at least one of the plug-in parts is a polygon.

[0010] Preferably, the characteristic diameter dimension of the longitudinal section of the plug-in part gradually decreases in the mesial to distal direction.

[0011] To achieve the object of the present utility model, the present utility model also provides a dental orthodontic system, including an upper shell-shaped tooth orthodontic appliance and the extraoral bow according to any one of the above. The upper shell-shaped tooth orthodontic appliance is a shell having a plurality of cavities for accommodating the upper teeth of the patient. When the first preset distance is 1 mm - 2 mm, the upper shell-shaped tooth orthodontic appliance includes an upper shell-shaped tooth orthodontic appliance body and an extension part. The extension part is formed by extending from the buccal surface of the shell part where the cavities of one or more teeth or the adjacent tooth interdental spaces of the posterior teeth area of the upper shell-shaped tooth orthodontic appliance body towards the gingiva direction from the tooth crown.

[0012] On the buccal surface of the housing part of the upper shell-shaped dental appliance body where there is a cavity for one or more teeth in the posterior tooth area or the interdental space between adjacent teeth, and on the buccal surface of the extension part, a first installation channel and a second installation channel adapted to the two plug-in parts are respectively provided for accommodating the two plug-in parts. The first installation channel and the second installation channel are arranged at the first preset distance in the gingivomandibular direction.

[0013] Preferably, the length dimension of the first installation channel in the mesiodistal direction is greater than its height dimension in the gingivomandibular direction, and the length dimension of the second installation channel in the mesiodistal direction is greater than its height dimension in the gingivomandibular direction.

[0014] Preferably, the inner contour shape and size of the first installation channel and the second installation channel are the same as the outer contour shape and size of the plug-in part.

[0015] Preferably, the second installation channel is arranged at a second preset distance in the gingivomandibular direction from the edge of the extension part away from the occlusal surface, and the second preset distance is 1 mm - 3 mm.

[0016] The present utility model further provides a dental orthodontic system, including an upper shell-shaped dental appliance, a lower shell-shaped dental appliance, and an extraoral bow according to any one of the above. The upper shell-shaped dental appliance and the lower shell-shaped dental appliance are respectively housings having a plurality of cavities for accommodating the upper teeth and the lower teeth of the patient. When the first preset distance is 2 mm - 6 mm, on the buccal surface of the housing part of the upper shell-shaped dental appliance and the lower shell-shaped dental appliance where there is a cavity for one or more teeth in the posterior tooth area or the interdental space between adjacent teeth, a third installation channel and a fourth installation channel adapted to the two plug-in parts are respectively provided for accommodating the two plug-in parts. The third installation channel and the fourth installation channel are arranged at the first preset distance in the gingivomandibular direction.

[0017] Preferably, the length dimension of the third installation channel in the mesiodistal direction is greater than its height dimension in the gingivomandibular direction, and the length dimension of the fourth installation channel in the mesiodistal direction is greater than its height dimension in the gingivomandibular direction.

[0018] Preferably, the inner contour shape and size of the third installation channel and the fourth installation channel are the same as the outer contour shape and size of the plug-in part.

[0019] Preferably, the third installation channel is arranged at a third preset distance in the gingivomandibular direction from the edge of the upper shell-shaped dental appliance near the gingiva, and the fourth installation channel is arranged at a third preset distance in the gingivomandibular direction from the edge of the lower shell-shaped dental appliance near the gingiva. The third preset distance is 1 mm - 3 mm.

[0020] Compared with the prior art, the present utility model adopts the above technical solutions and has at least one of the following beneficial effects:

[0021] (1) For the extraoral arch provided by the present utility model, the connecting parts at both ends of the inner arch body of the extraoral arch are designed to include two parallel plug-in parts arranged vertically in the gingival-jaw direction. On the one hand, the installation fixation points of the extraoral arch are increased. In this way, after the extraoral arch is installed, the up-and-down rotation of the extraoral arch can be prevented, ensuring that the traction direction remains unchanged, thereby ensuring the realization of the expected traction effect. On the other hand, when installing the extraoral arch, for the two parallel plug-in parts arranged in parallel, only the two parallel plug-in parts need to be inserted into the corresponding installation channels in parallel, which is a one-step installation, convenient and fast.

[0022] (2) For the extraoral arch provided by the present utility model, by setting the distance between the two plug-in parts within different range intervals, it can be installed separately on the upper jaw or simultaneously on the upper and lower jaws. Clinicians or patients can have the opportunity to make a flexible choice, improving the acceptance degree of clinicians or patients.

[0023] (3) For the dental orthodontic system provided by the present utility model, by respectively installing the two plug-in parts of the extraoral arch on the upper jaw shell-shaped tooth orthodontic appliance and the extension part or respectively installing the two plug-in parts of the extraoral arch on the upper jaw shell-shaped tooth orthodontic appliance and the lower jaw shell-shaped tooth orthodontic appliance; after the extraoral arch is installed, when the extraoral arch is pulled backward in the sagittal direction, the inner arch applies a sagittal backward traction force to the shell-shaped tooth orthodontic appliance, causing the teeth accommodated in the shell-shaped tooth orthodontic appliance to move distally as a whole, so that while using the shell-shaped tooth orthodontic appliance to align the teeth, the growth improvement of the jaw bone can also be realized.

[0024] (4) For the dental orthodontic system provided by the present utility model, by setting the installation channel near the edge of the shell-shaped tooth orthodontic appliance or the extension part at a certain distance from the edge of the shell-shaped tooth orthodontic appliance or the extension part, it can be avoided that due to excessive extraoral traction force, the shell-shaped tooth orthodontic appliance or the extension part warps, causing the direction change of the corresponding installation channel, thus affecting the traction direction of the extraoral arch and finally resulting in an undesired traction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] One or more embodiments are exemplarily illustrated by the pictures in the corresponding drawings. These exemplary illustrations do not limit the embodiments. Elements with the same numerical reference signs are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0026] Figure 1 It is a schematic structural diagram of an extraoral arch in an embodiment of the present utility model;

[0027] Figure 2 is Figure 1 a wearing schematic diagram of the extraoral arch in

[0028] Figure 3 Schematic diagram of the wearing of the extraoral arch in another embodiment of the present utility model;

[0029] Figure 4 Schematic diagram of the wearing of the extraoral arch in another embodiment of the present utility model;

[0030] Figure 5 Schematic diagram of the wearing of the extraoral arch in another embodiment of the present utility model;

[0031] Figure 6 Schematic diagram of the wearing of the extraoral arch in another embodiment of the present utility model;

[0032] Figure 7 is Figure 6 Schematic longitudinal sectional view of the insertion part in;

[0033] Figure 8 Schematic structural diagram of a dental orthodontic system in an embodiment of the present utility model;

[0034] Figure 9 Schematic structural diagram of a dental orthodontic system in another embodiment of the present utility model;

[0035] Figure 10 Schematic structural diagram of an extraoral arch in the prior art;

[0036] Figure 11 is Figure 10 Schematic diagram of the wearing of the extraoral arch in. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will elaborate on each implementation manner of the present utility model in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation manner of the present utility model, many technical details are presented for the convenience of readers to better understand the present utility model. However, even without these technical details and various changes and modifications based on the following implementation manners, the technical solutions required to be protected by the present utility model can still be achieved. The division of the following various embodiments is for the convenience of description and should not constitute any limitation to the specific implementation manner of the present utility model.

[0038] The directional terms such as "upper", "lower", "left", and "right" used in the description herein are all the directions in the accompanying drawings and do not refer to specific limitations. Unless otherwise clearly specified and limited, the terms "connected" or "joined" in this article should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated, and can be directly connected or indirectly connected through an intermediate medium.

[0039] In each embodiment of the present utility model, the "posterior tooth area" mentioned is defined according to the tooth classification on pages 36-38 of the second edition of "Introduction to Stomatology" published by Peking University Medical Press, including premolars and molars, the teeth marked as 4-8 in the FDI notation, and the teeth marked as 1-3 in the FDI notation for the anterior tooth area. The teeth in the anterior tooth area include central incisors, lateral incisors, and canines.

[0040] Please refer to Figure 1 and Figure 2 as shown. The present application provides an extraoral arch 100, which includes an inner arch 11 located in the patient's oral cavity and an outer arch 12 located outside the patient's oral cavity and connected to the inner arch 11; the inner arch 11 includes an inner arch body 13 and connecting parts 14 arranged at both ends of the inner arch body 13, and the connecting parts 14 include two parallel plug-in parts 15. During production, due to manufacturing errors, the two plug-in parts 15 may not be in a strictly parallel relationship, and there may be an error of approximately 0-5°, which is also within the protection scope of the present application. Further explanation, the so-called parallel arrangement here means that the central axes of the two plug-in parts 15 are parallel to each other; in the present application, the two plug-in parts 15 are arranged at a first preset distance L1 in the gingivomandibular direction, and the first preset distance L1 also refers to the distance between the central axes of the two plug-in parts 15 in the gingivomandibular direction. Among them, in the present application, the first preset distance L1 can be within the range of 1 mm - 2 mm, or within the range of 2 mm - 6 mm; when worn, the plug-in parts 15 correspond to the positions of the posterior teeth in the patient's oral cavity, generally the 4-7 teeth on the left and right sides of the patient, and can cover one tooth, or two or more teeth, or the adjacent tooth gap position between two teeth. Such a structural design, on the one hand, by providing connecting parts 14 including two plug-in parts 15 at both ends of the extraoral arch body 13, the two plug-in parts 15 arranged in the gingivomandibular direction can prevent the inner arch 11 from rotating up and down after installation, being relatively stable, so as to ensure that the overall traction direction of the extraoral arch 100 does not change, thus facilitating the achievement of the expected traction effect; on the other hand, by arranging the two plug-in parts 15 in parallel in the gingivomandibular direction and cooperating with the two parallel installation channels in the patient's oral cavity, compared with the two retention parts 17 arranged in the anteroposterior direction in the prior art (please refer to Figure 10 and Figure 11For the case shown, it is more conducive to installation. Since the distance between the far ends on the left and right sides of the inner arch of the extraoral arch is greater than the distance between the near ends, when the inner arch is inserted into the two retention parts 17 in sequence from the near end, when point A is inserted into the retention part 17 at the near end, a lingual force needs to be applied to the far end parts on the left and right sides of the inner arch to deform the far end parts on the left and right sides of the inner arch. For example, the distance between the far ends on the left and right sides is reduced so as to pass through the retention part 17 at the near end. After point A passes through the retention part 17 at the near end, a force still needs to be applied to the far end parts on the left and right sides of the inner arch for a second deformation so that the far end parts on the left and right sides of the inner arch can pass through the retention part 17 at the far end. Obviously, such a structure that requires applying force to the far end of the inner arch twice to install the inner arch, especially after passing through the retention part 17 at the near end, due to the small distance between the two retention parts 17 at the near end and the far end, there are great difficulties in applying force and installation. In the present application, two parallel insertion parts 15 are respectively arranged at both ends of the inner arch 11, avoiding applying force and installation twice and being able to be installed in place at one time, with convenient installation.

[0041] In one embodiment, when the range of the first preset distance L1 is 1 mm - 2 mm, the insertion parts 15 can be installed at the position of the posterior teeth area of the patient's maxillary teeth 10 and the gingiva 20. For example, installation channels 16 for inserting the two insertion parts 15 can be bonded at the position of the 6th tooth in the posterior teeth area of the patient's maxillary teeth and the gingiva corresponding to the 6th tooth. The two installation channels 16 are also arranged in parallel. During installation, the inner arch 11 is inserted parallel in the distal direction.

[0042] In another embodiment, please refer to Figure 3 As shown, when the range of the first preset distance L1 is 2 mm - 6 mm, the insertion parts 15 can be respectively installed at the position of the posterior teeth area of the patient's maxillary teeth 10 and the posterior teeth area of the patient's mandibular teeth 30. For example, installation channels for inserting the two insertion parts 15 can be respectively bonded at the position of the 6th tooth in the posterior teeth area of the patient's maxillary teeth and the 6th tooth in the posterior teeth area of the patient's mandibular teeth. The two installation channels are also arranged in parallel. During installation, the inner arch 11 is inserted parallel in the distal direction.

[0043] In one embodiment, please continue to refer to Figure 2 As shown, the midpoints of the two insertion parts 15 in the mesiodistal direction are located on the same straight line M in the vertical direction, which is convenient for processing and installation and is more beautiful. During installation, the distal ends of the two parallel insertion parts 15 are simultaneously inserted into the proximal ends of the two parallel installation channels 16, with one-step installation, which is convenient and fast. In another embodiment, please refer to Figure 4As shown, the straight lines in the vertical direction passing through the centers of the two parallel plug-in parts 15 are M1 and M2 respectively. They may not be on the same straight line, which does not prevent the simultaneous installation of the two plug-in parts 15. Such a structural design provides an alternative design for the arrangement of the plug-in parts, allowing clinicians or patients to make a free choice.

[0044] In one embodiment, please refer to Figure 5 As shown, when the first preset distance between the two parallel plug-in parts 15 in the gingival-jaw direction is 1 mm - 2 mm, the two plug-in parts 15 are usually installed on the posterior tooth area of the patient's maxillary teeth 10 and the gingiva 20. Generally, after wearing, the inner arch body 13 is closer to the gingiva in the gingival-jaw direction, and the anterior tooth area part of the inner arch body 13 needs to be connected to the external arch outside the mouth. At this time, the part of the external arch connected to the outside of the mouth will inevitably lift the patient's upper lip towards the gingiva, which will increase the patient's discomfort. To alleviate this discomfort, the inner arch body 13 of the present application includes a first connecting member 111 connected to the external arch, a second connecting member 112 connected to the connecting part 14, and a transition member 110 disposed between the first connecting member 111 and the second connecting member 112 and extending towards the occlusal surface in the anterior tooth area. The far mid-end of the first connecting member 111 and the near mid-end of the second connecting member 112 are respectively connected to both ends of the transition member 110, forming a "Z" shape as a whole. Among them, the first connecting member 111 is disposed near the crown of the patient's maxillary teeth 10. Regarding the setting relationship between the first connecting member 111 and the second connecting member 112, they can be arranged in parallel or at a certain angle, which is not limited in the present application. With such a structural design of the present application, the external arch can be connected at the first connecting member 111. Since the first connecting member 111 is disposed near the crown, after connection, the position of the part of the external arch connected to the outside of the mouth is more in line with the position between the upper and lower lips when the patient is in the natural lip-closed state, which is beneficial to alleviating the patient's discomfort.

[0045] In one embodiment, the cross-sectional shape of the plug-in part 15 is mostly circular, that is, the plug-in part 15 is a cylindrical structure, and cylinders are usually relatively simple to process. It can be understood that in some other embodiments, in order to further prevent the inner arch from rotating, the cross-sectional shape of at least one of the plug-in parts 15 can also be designed as a polygon, such as a triangle, a square, a rectangle, a pentagon, etc., that is, the plug-in part 15 is a polygonal prism. The structural design of these non-rotary bodies can play a role in restricting the direction. In the design, setting one plug-in part 15 with such a structure can achieve the purpose of restricting the rotation direction. Of course, setting both of the plug-in parts 15 with such a structure is more conducive to restricting the direction, preventing random rotation, and more conducive to keeping the traction direction of the external arch 100 unchanged, thereby facilitating the achievement of the expected traction target.

[0046] In one embodiment, see Figure 6 and Figure 7 As shown, the characteristic diameter of the longitudinal section of the plug-in portion 15 gradually decreases from the mesial to the distal direction. During installation, the smaller size of the distal end of the plug-in portion 15, that is, the smaller size of the insertion end of the plug-in portion 15, is more conducive to inserting into the installation channel 16. The gradually decreasing size makes the outer surface of the plug-in portion 15 evenly inclined from the mesial to the distal direction, ensuring that the plug-in portion 15 is relatively smooth and unobstructed during the insertion process of the installation channel 16.

[0047] To achieve the purpose of this utility model, please refer to Figure 8 As shown, the utility model also provides a dental correction system 200, including a maxillary shell-shaped dental appliance 21 and any of the above-mentioned extraoral bows 100, wherein the maxillary shell-shaped dental appliance 21 is a shell having a plurality of cavities for accommodating the patient's maxillary teeth, and when the first preset distance L1 is 1mm-2mm, the maxillary shell-shaped dental appliance 21 includes a maxillary shell-shaped dental appliance body 22 and an extension 23, wherein the extension 23 is formed by the buccal surface of the shell part where the cavity of one or more teeth in the posterior tooth area of the maxillary shell-shaped dental appliance body 22 or the adjacent tooth gap of the adjacent teeth is located, extending from the crown to the gum direction; wherein the maxillary shell-shaped dental appliance The buccal surface of a tooth cavity in the posterior tooth area of the appliance body 21, or the buccal surface of multiple tooth cavities, or the buccal surface of the shell portion where the adjacent tooth gaps are located is provided with the first mounting channel 24, and the buccal surface of the extension portion 23 is provided with a second mounting channel 25 for accommodating the two plug-in portions 15, and the first mounting channel 24 and the second mounting channel 25 are arranged at the first preset distance L1 in the gingival and maxillofacial direction. In the present application, the distance between the first mounting channel 24 and the second mounting channel 25 in the gingival and maxillofacial direction is the distance between the central axis of the first mounting channel 24 and the central axis of the second mounting channel 25 in the gingival and maxillofacial direction. In this way, by respectively installing the two connecting parts of the extraoral arch on the maxillary shell-shaped dental appliance and the extension part, after the extraoral arch is installed, when the extraoral arch is pulled backward in the sagittal direction, the inner arch applies a sagittal backward traction force to the maxillary shell-shaped dental appliance and the extension part, so that the teeth accommodated by the maxillary shell-shaped dental appliance move as a whole in the distal direction, thereby achieving the improvement of jaw growth while aligning the teeth using the shell-shaped dental appliance.

[0048] In one embodiment, the length dimension of the first installation channel 24 in the mesiodistal direction is greater than its height dimension in the gingivolabial direction, and the length dimension of the second installation channel 25 in the mesiodistal direction is greater than its height dimension in the gingivolabial direction; wherein, the height dimension in the gingivolabial direction is sufficient to accommodate the insertion portion 15. For example, the diameter of the insertion portion 15 can be 1 mm. Since the height dimension also includes the side wall thickness of the first installation channel 24 and the second installation channel 25, therefore, the height dimension can be 2-3 times the diameter dimension of the insertion portion 15, approximately 2 mm - 3 mm; the length dimensions of the first installation channel 24 and the second installation channel 25 in the mesiodistal direction are large. For example, the length dimension can be 1.5 - 3 times the height dimension, approximately 3 mm - 9 mm. In this way, the length dimension of the insertion portion 15 that can be accommodated in the first installation channel 24 and the second installation channel 25 in the mesiodistal direction is larger, that is, the contact area between the outer contour of the insertion portion 15 and the inner contours of the first installation channel 24 and the second installation channel 25 is larger, further ensuring the stability after the insertion portion 15 is inserted into the first installation channel 24 and the second installation channel 25.

[0049] In one embodiment, the shapes and dimensions of the inner contours of the first installation channel 24 and the second installation channel 25 are consistent with the shapes and dimensions of the outer contour of the insertion portion 15; such a structural design makes the insertion portion 15 more matched and reliably installed with the first installation channel 24 and the second installation channel 25, so that the extraoral bow 100 is more stable after installation and will not rotate, thereby ensuring the invariance of the traction direction and finally guaranteeing the expected traction effect. For example, when the cross-section of the insertion portion 15 is circular, the cross-sections of the first installation channel 24 and the second installation channel 25 are also circular, or when the cross-section of the insertion portion 15 is polygonal, the cross-sections of the first installation channel 24 and the second installation channel 25 are also polygonal; moreover, the inner contour dimensions of the first installation channel 24 and the second installation channel 25 are consistent with the outer contour dimensions of the insertion portion 15. For example, when the characteristic diameter dimension of the cross-section of the insertion portion 15 gradually decreases in the mesial to distal direction, the characteristic diameter dimensions of the cross-sections of the first installation channel 24 and the second installation channel 25 also gradually decrease in the mesial to distal direction.

[0050] In one embodiment, the second mounting channel 25 is arranged at a second preset distance L2 from the edge 231 of the extension portion 23 away from the occlusal surface in the gingival and maxillary direction, and the second preset distance L2 is 1mm-3mm; since the traction force of the extraoral bow 100 is relatively large when performing extraoral traction, it is usually greater than the intraoral traction force. If the second mounting channel 25 is closer to the edge 231 of the extension portion 23 away from the occlusal surface during the traction process, the larger traction force will easily cause the edge 231 of the extension portion 23 to warp, which will cause the direction of the second mounting channel 25 arranged on the buccal surface of the extension portion 23 to change, thereby affecting the traction direction of the extraoral bow 100, and ultimately causing an unexpected change in the traction effect. Through experiments conducted by the inventors of the present application, it was found that when the second preset distance L2 is less than 1 mm, it is prone to edge warping. When the second preset distance L2 is greater than 3 mm, it will affect the gingival and maxillary arrangement of the first mounting channel 24 and the second mounting channel 25, that is, it will cause the first mounting channel 24 to be set close to the occlusal surface, which may affect the occlusion. Therefore, in the present application, the preferred range of the second preset distance L2 is 1 mm-3 mm.

[0051] The utility model also provides a dental correction system 300, please refer to Figure 9 As shown, it includes a maxillary shell-shaped dental appliance 31, a mandibular shell-shaped dental appliance 32 and an extraoral bow 100 of any one of the above items, wherein the maxillary shell-shaped dental appliance 31 and the mandibular shell-shaped dental appliance 32 are respectively shells with multiple cavities for accommodating the patient's maxillary teeth and mandibular teeth. When the first preset distance L1 is 2mm-6mm, the buccal surfaces of the shell parts where the cavities of one or more teeth in the posterior area of the maxillary shell-shaped dental appliance 31 and the mandibular shell-shaped dental appliance 32 or the adjacent tooth gaps of adjacent teeth are located are respectively provided with a third mounting channel 33 and a fourth mounting channel 34 adapted to the two plug-in parts 15, for accommodating the two plug-in parts 15, and the third mounting channel 33 and the fourth mounting channel 34 are arranged at the first preset distance L1 in the gingival-mandibular direction. Similarly, the distance between the third installation channel 33 and the fourth installation channel 34 in the gingival and jaw upwards in the present application is the distance between the central axis of the third installation channel 33 and the central axis of the fourth installation channel 34 in the gingival and jaw upwards. In this way, by installing the two plug-in parts of the extraoral arch on the maxillary shell-shaped dental appliance and the mandibular shell-shaped dental appliance respectively, after the extraoral arch is installed, when the extraoral arch is pulled backward in the sagittal direction, the inner arch applies a sagittal backward traction force to the maxillary shell-shaped dental appliance and the mandibular shell-shaped dental appliance, so that the teeth accommodated by the maxillary shell-shaped dental appliance and the mandibular shell-shaped dental appliance move in the distal direction as a whole, so that the growth of the jaw can be improved while aligning the teeth using the shell-shaped dental appliance.

[0052] In one embodiment, the mesiodistal length dimension of the third installation channel 33 is greater than its gingivolingual height dimension, and the mesiodistal length dimension of the fourth installation channel 4 is greater than its gingivolingual height dimension; wherein, the gingivolingual height dimension is sufficient to accommodate the insertion portion 15. For example, the diameter of the insertion portion 15 can be 1 mm. Since the height dimension also includes the side wall thickness of the third installation channel 33 and the fourth installation channel 34, therefore, the height dimension can be 2-3 times the diameter dimension of the insertion portion 15, approximately 2 mm - 3 mm; the mesiodistal length dimensions of the third installation channel 33 and the fourth installation channel 34 are large. For example, the length dimension can be 1.5 - 3 times the height dimension, approximately 3 mm - 9 mm. Thus, the length dimension of the insertion portion 15 that can be accommodated in the third installation channel 33 and the fourth installation channel 34 along the mesiodistal direction is large, that is, the contact area between the outer contour of the insertion portion 15 and the inner contours of the third installation channel 33 and the fourth installation channel 34 is large, further ensuring the stability of the insertion portion 15 after being inserted into the third installation channel 33 and the fourth installation channel 34.

[0053] In one embodiment, the inner contour shapes and dimensions of the third installation channel 33 and the fourth installation channel 34 are consistent with the outer contour shapes and dimensions of the insertion portion 15; such a structural design makes the insertion portion 15 more matching and reliable after being installed in the third installation channel 33 and the fourth installation channel 34, so that the extraoral bow 100 is more stable after installation and will not rotate, thereby ensuring the invariance of the traction direction and ultimately guaranteeing the expected traction effect. For example, when the cross-section of the insertion portion 15 is circular, the cross-sections of the third installation channel 33 and the fourth installation channel 34 are also circular, or when the cross-section of the insertion portion 15 is polygonal, the cross-sections of the third installation channel 33 and the fourth installation channel 34 are also polygonal; moreover, the inner contour dimensions of the third installation channel 33 and the fourth installation channel 34 are consistent with the outer contour dimensions of the insertion portion 15. For example, when the characteristic diameter dimension of the cross-section of the insertion portion 15 gradually decreases from the mesial to the distal direction, the characteristic diameter dimensions of the cross-sections of the third installation channel 33 and the fourth installation channel 34 also gradually decrease from the mesial to the distal direction.

[0054] In one embodiment, the third installation channel 33 is disposed at a third preset distance L3 from the gingival end edge of the maxillary shell tooth aligner 31 in the gingival-jaw direction, and the fourth installation channel 34 is disposed at the third preset distance L3 from the gingival end edge of the mandibular shell tooth aligner 32 in the gingival-jaw direction. The third preset distance L3 is 1 mm - 3 mm. Such a setting of the third preset distance is also because the traction force during extraoral traction of the extraoral arch 100 is relatively large, usually greater than the intraoral traction force. If the third installation channel 33 is close to the gingival end edge of the maxillary shell tooth aligner 31, or the fourth installation channel 34 is close to the gingival end edge of the mandibular shell tooth aligner 32, during the traction process, the relatively large traction force is likely to cause the gingival end edge of the maxillary shell tooth aligner 31 or the gingival end edge of the mandibular shell tooth aligner 32 to warp, which will cause the directions of the third installation channel 33 and the fourth installation channel 34 provided on the maxillary shell tooth aligner 31 and the mandibular shell tooth aligner 32 to change, thereby affecting the traction direction of the extraoral arch 100 and ultimately resulting in an undesired change in the traction effect. Similarly, through the inventor's experimental verification, the range of the third preset distance L3 is the same as the range of the second preset distance L2, which is also 1 mm - 3 mm, and will not be elaborated here.

[0055] It should be noted that, without conflict, the above embodiments can be freely combined as needed to form different new implementation schemes, and the implementation schemes formed after such combination are all within the protection scope of the present application. To save the space of the application text, it will not be elaborated here.

[0056] The above is only the preferred implementation mode of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as within the protection scope of the present application.

[0057] Similarly, the above is only the specific implementation mode of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art within the technical scope disclosed in the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An extraoral arch, comprising an inner arch located inside the patient's mouth and an outer arch located outside the patient's mouth and connected to the inner arch, characterized in that, The inner arch includes an inner arch body, and connecting parts are arranged at both ends of the inner arch body. The connecting parts include two parallel plug-in parts, and the two plug-in parts are arranged at a first preset distance in the gingivolingual direction. When worn, the connecting parts are arranged corresponding to the position of the posterior teeth area of the patient's oral cavity; wherein, the first preset distance is 1 mm - 6 mm.

2. The extraoral arch according to claim 1, characterized in that, The inner arch body includes a first connecting piece connected to the outer arch, a second connecting piece connected to the connecting part, and a transition piece arranged between the first connecting piece and the second connecting piece and extending towards the occlusal surface in the anterior teeth area. The distal middle end of the first connecting piece and the proximal middle end of the second connecting piece are respectively connected to both ends of the transition piece, and the whole is in a "Z" shape. Wherein, the first preset distance is 1 mm - 2 mm.

3. The extraoral arch according to claim 1, wherein The midpoints of the two plug-in parts in the mesiodistal direction are on the same straight line in the gingivolingual direction.

4. The extraoral arch according to claim 1, characterized in that, The cross-sectional shape of at least one of the plug-in parts is polygonal.

5. The extraoral arch according to claim 4, characterized in that, The characteristic diameter dimension of the longitudinal section of the plug-in part gradually decreases in the mesial to distal direction.

6. A dental orthodontic system, characterized in that, It includes an upper shell-shaped tooth orthodontic appliance and an extraoral arch according to any one of claims 1 to 5. The upper shell-shaped tooth orthodontic appliance is a shell with a plurality of cavities for accommodating the upper teeth of the patient. When the first preset distance is 1 mm - 2 mm, the upper shell-shaped tooth orthodontic appliance includes an upper shell-shaped tooth orthodontic appliance body and an extension part. The extension part is formed by extending from the buccal surface of the shell part where the cavity of one or more teeth in the posterior teeth area of the upper shell-shaped tooth orthodontic appliance body or the interdental space of adjacent teeth towards the gingiva from the tooth crown. The buccal surfaces of the shell part where the cavity of one or more teeth in the posterior teeth area of the upper shell-shaped tooth orthodontic appliance body or the interdental space of adjacent teeth and the buccal surface of the extension part are respectively provided with a first installation channel and a second installation channel adapted to the two plug-in parts for accommodating the two plug-in parts. The first installation channel and the second installation channel are arranged at the first preset distance in the gingivolingual direction.

7. The dental orthodontic system according to claim 6, characterized in that, The length dimension of the first installation channel in the mesiodistal direction is greater than its height dimension in the gingivolingual direction, and the length dimension of the second installation channel in the mesiodistal direction is greater than its height dimension in the gingivolingual direction.

8. The dental orthodontic system according to claim 6, wherein The inner contour shape and size of the first installation channel and the second installation channel are consistent with the outer contour shape and size of the plug-in part.

9. The dental orthodontic system according to claim 6, wherein The second installation channel is arranged at a second preset distance from the edge of the extension part away from the occlusal surface in the gingivolingual direction, and the second preset distance is 1 mm - 3 mm.

10. A dental orthodontic system, characterized in that, Comprising an upper shell-shaped tooth orthodontic appliance, a lower shell-shaped tooth orthodontic appliance, and an extraoral arch according to any one of claims 1 to 5, wherein the upper shell-shaped tooth orthodontic appliance and the lower shell-shaped tooth orthodontic appliance are respectively shells having a plurality of cavities for accommodating the upper teeth and the lower teeth of the patient. When the first preset distance is 2 mm - 6 mm, on the buccal surfaces of the parts of the shells where the cavities of one or more teeth or the adjacent tooth interdental spaces of the posterior teeth regions of the upper shell-shaped tooth orthodontic appliance and the lower shell-shaped tooth orthodontic appliance are located, a third installation channel and a fourth installation channel adapted to the two plug-in parts are respectively provided for accommodating the two plug-in parts, and the third installation channel and the fourth installation channel are arranged at the first preset distance in the gingivomandibular direction.

11. The dental orthodontic system according to claim 10, characterized in that, The length dimension of the third installation channel in the mesiodistal direction is greater than its height dimension in the gingivomandibular direction, and the length dimension of the fourth installation channel in the mesiodistal direction is greater than its height dimension in the gingivomandibular direction.

12. The dental orthodontic system according to claim 10, wherein, The inner contour shape and size of the third installation channel and the fourth installation channel are consistent with the outer contour shape and size of the plug-in part.

13. The dental orthodontic system according to claim 10, characterized in that, The third installation channel is arranged at a third preset distance from the edge near the gingiva of the upper shell-shaped tooth orthodontic appliance in the gingivomandibular direction, and the fourth installation channel is arranged at a third preset distance from the edge near the gingiva of the lower shell-shaped tooth orthodontic appliance in the gingivomandibular direction. The third preset distance is 1 mm - 3 mm.

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