Device for pushing molar backwards

Abstract

The invention provides a molar backward pushing device. The molar backward pushing device comprises a palate support assembly and a backward pushing assembly. And a first orthodontic belt ring of the palate support assembly is connected with the abutment teeth on the two sides. Each backward pushing assembly comprises a telescopic adjusting device, an elastic piece and a second orthodontic belt ring. The telescopic adjusting device and the elastic piece are connected between the first orthodontic belt ring and the second orthodontic belt ring, and the second orthodontic belt ring is used for being connected with a molar to be pushed backwards. When the orthodontic device is used, the first orthodontic belt ring is adhered to an abutment tooth, the second orthodontic belt ring is adhered to a molar to be pushed, and then the length of the telescopic adjusting device is adjusted in the oral cavity of a patient, so that the elastic piece is pressed, and further pushing force towards the distal direction is provided for the molar to be pushed. And during further diagnosis, a doctor only needs to adjust the length of the telescopic adjusting device in the oral cavity of the patient, so that the purpose of adjusting the thrust can be achieved. Compared with the prior art, the device is easy and convenient to operate, the operation time beside a clinical chair is shortened, the negative influence on the dental surface and periodontal health is relatively small, and the molar pushing direction is more stable.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a device for pushing molars backwards. Background Art

[0002] During orthodontic treatment, the need to push the molars backward is very common. For example, the loss of missing teeth space caused by early loss of deciduous teeth and the correction of mild crowding without tooth extraction may require pushing the molars backward. At present, the non-invasive devices commonly used in clinical practice include extraoral bows and swing appliances. The extraoral bow is a device that uses the extraoral force of the jaw as support to move the teeth distally. It is composed of extraoral devices and intraoral devices. The extraoral device includes a head cap or a neck strap. The swing appliance is a device that uses the intra-mandibular support to offset the reaction force of the distal movement of the molars. It is composed of a palatal support, a force-applying device, and a tooth retention device.

[0003] Extraoral arches are bulky and uncomfortable, which may affect patients' activities, social interaction, and sleep, and require high patient compliance. Swinging appliances require doctors to remove the appliance at each follow-up visit, apply force outside the mouth, and then re-bond it. The chairside operation takes a long time. Repeated removal and bonding of the appliance will also have a negative impact on the patient's dental and periodontal health. In addition, the device may cause adverse tooth movement such as labial inclination of the anterior teeth. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a device for pushing molars backwards, aiming to solve the problems of large size, poor comfort, and frequent disassembly and assembly involved in the devices for pushing molars backwards in the related art.

[0005] The present invention provides a device for pushing molars backwards, comprising:

[0006] The palatal support assembly comprises a first orthodontic band ring for being connected with the abutment teeth on both sides;

[0007] The push-back assembly includes one or two groups, which are used to be installed between the first orthodontic band ring and the molar to be pushed back on one side or both sides. Each group of the push-back assembly includes a telescopic adjustment device, an elastic member and a second orthodontic band ring. The second orthodontic band ring is used to be connected to the molar to be pushed back. The telescopic adjustment device and the elastic member are arranged between the first orthodontic band ring and the second orthodontic band ring. The elastic member is used to provide an elastic force to move the first orthodontic band ring and the second orthodontic band ring away from each other.

[0008] According to the molar pushing backward device provided by the present invention, the palatal support assembly includes a palatal support body and at least two of the first orthodontic band rings, the top of the palatal support body is used to fit with the hard palate of the oral cavity, and the plurality of the first orthodontic band rings are arranged on the left and right sides of the palatal support body, and are all connected to the palatal support body through a connecting rod.

[0009] According to the device for pushing molars backward provided by the present invention, the telescopic adjustment device comprises:

[0010] A telescopic assembly, comprising a cylinder and a telescopic rod, wherein the telescopic rod is slidably arranged in the cylinder, and ends of the telescopic rod and the cylinder that are away from each other are respectively connected to the first orthodontic band ring and the elastic member;

[0011] The length adjustment component is arranged between the cylinder and the telescopic rod, and is used to adjust or fix the extension length of the telescopic rod.

[0012] According to the molar pushing backward device provided by the present invention, the length adjustment component includes a fixing hole, an adjustment hole and a locking bolt, one of the fixing hole and the adjustment hole is arranged on the telescopic rod, and the other is arranged on the cylinder, the fixing hole and the adjustment hole respectively extend along the radial direction of the cylinder or the telescopic rod, a plurality of adjustment holes are provided, and the plurality of adjustment holes are distributed along the axial direction of the cylinder or the telescopic rod, and when the fixing hole is aligned with one of the adjustment holes, the locking bolt is used to enter and exit the fixing hole and the corresponding adjustment hole.

[0013] According to the molar-pushing backward device provided by the present invention, the axes of the plurality of adjustment holes intersect with the same generatrix of the telescopic rod or the cylinder where they are located.

[0014] According to the molar pushing backward device provided by the present invention, one of the outer side surface of the telescopic rod and the inner side surface of the cylinder is provided with a anti-rotation slider, and the other is provided with a anti-rotation groove, the anti-rotation slider is slidably connected to the anti-rotation groove, and the anti-rotation groove extends along the axial direction of the telescopic rod or the cylinder.

[0015] According to the molar pushing backward device provided by the present invention, the length adjustment component includes an external thread arranged on the portion of the telescopic rod located inside the cylinder and an internal thread arranged on the inner side wall of the cylinder, the telescopic rod is threadedly connected to the cylinder, one of the telescopic rod and the cylinder is rotatably connected to the corresponding first orthodontic band ring or the second orthodontic band ring, the rotation axis is colinear with the rotation axis of the telescopic rod, and the other is connected to the corresponding second orthodontic band ring or the first orthodontic band ring through the elastic member.

[0016] According to the molar-pushing backward device provided by the present invention, the outer sides of the telescopic rod and the cylinder are both provided with clamping parts for being connected to the rotating tool to prevent rotation.

[0017] According to the molar-pushing backward device provided by the present invention, the telescopic adjustment device and the elastic member are arranged on the palate side or the buccal side of the first orthodontic band ring and the second orthodontic band ring.

[0018] According to the device for pushing molars backward provided by the present invention, the elastic member is a spring.

[0019] The present invention adopts the above technical solution, which has the following advantages:

[0020] The device for pushing molars backward provided by the present invention comprises a palatal support component and a push-back component. The palatal support component comprises a first orthodontic band ring for being sleeved with abutment teeth on both sides, and when the first orthodontic band ring is respectively connected with abutment teeth on both sides, the palatal support component forms a supporting carrier. When only one side of the molar needs to be pushed back, a group of push-back components is provided, and is arranged on the push-back side, and when both sides of the molar need to be pushed back, two groups of push-back components are provided. Each group of push-back components comprises a telescopic adjustment device, an elastic member and a second orthodontic band ring. The telescopic adjustment device and the elastic member are connected between the first orthodontic band ring and the second orthodontic band ring, and the second orthodontic band ring is used to connect with the molar to be pushed back. When in use, the first orthodontic band ring is bonded to the abutment teeth on both sides, and the second orthodontic band ring is bonded to the molar to be pushed, and then the length of the telescopic adjustment device is adjusted in the patient's mouth, so that the elastic member is squeezed, thereby providing a thrust in the distal direction for the molar to be pushed. During follow-up visits, doctors only need to adjust the length of the telescopic adjustment device in the patient's mouth to adjust the thrust, without having to disassemble and re-bond the appliance, which increases the patient's comfort and reduces the requirement for patient compliance. Compared with the prior art, the present invention is easy to operate, reduces the clinical chairside operation time, has relatively little negative impact on the tooth surface and periodontal health, and the direction of pushing the molars is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 is a schematic structural diagram of a molar-pushing device provided in one embodiment of the present invention;

[0023] Figure 2 is a structural schematic diagram of a telescopic adjustment device provided by an embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of a telescopic adjustment device provided by one embodiment of the present invention;

[0025] Figure 4 is a top cross-sectional view of a cylinder provided by an embodiment of the present invention;

[0026] Figure 5 It is a top cross-sectional view of a telescopic rod provided in one embodiment of the present invention.

[0027] Reference numerals:

[0028] 110: first orthodontic band; 120: palatal support body; 130: connecting rod; 210: telescopic adjustment device; 211: telescopic rod; 2111: anti-rotation slider; 212: cylinder; 2121: anti-rotation slide groove; 213: fixing hole; 214: adjustment hole; 215: locking bolt; 220: spring; 230: second orthodontic band. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0035] The device for pushing molars backward provided by the present invention comprises a palatal support component and a push-back component. The palatal support component comprises a first orthodontic band ring for being sleeved with abutment teeth on both sides, and when the first orthodontic band ring is respectively connected with abutment teeth on both sides, the palatal support component forms a supporting carrier. When only one side of the molar needs to be pushed back, a group of push-back components is provided, and is arranged on the push-back side, and when both sides of the molar need to be pushed back, two groups of push-back components are provided. Each group of push-back components comprises a telescopic adjustment device, an elastic member and a second orthodontic band ring. The telescopic adjustment device and the elastic member are connected between the first orthodontic band ring and the second orthodontic band ring, and the second orthodontic band ring is used to connect with the molar to be pushed back. When in use, the first orthodontic band ring is bonded to the abutment teeth on both sides, and the second orthodontic band ring is bonded to the molar to be pushed, and then the length of the telescopic adjustment device is adjusted in the patient's mouth, so that the elastic member is squeezed, thereby providing a thrust in the distal direction for the molar to be pushed. During follow-up visits, doctors only need to adjust the length of the telescopic adjustment device in the patient's mouth to adjust the thrust, without having to disassemble and re-bond the appliance, which increases the patient's comfort and reduces the requirement for patient compliance. Compared with the prior art, the present invention is easy to operate, reduces the clinical chairside operation time, has relatively little negative impact on the tooth surface and periodontal health, and the direction of pushing the molars is more stable.

[0036] Combine the following Figures 1 to 5 The molar-pushing-back device of the present invention is described.

[0037] An embodiment of the present invention provides a device for pushing molars backwards, comprising a palatal support component and a backward pushing component.

[0038] The palatal support component includes at least two first orthodontic band rings 110, which are respectively bonded to the abutment teeth on both sides. After connection, the position of the palatal support component in the oral cavity is fixed to provide a support carrier for the push-back component.

[0039] The push-back assembly can be set in one group or two groups, and the number of groups of the push-back assembly is determined according to the patient's condition. When the patient only needs to push back the molars on one side, the push-back assembly can be set in one group and set on the side where the molars need to be pushed back. When the patient needs to push back the molars on both sides at the same time, the push-back assembly can be set in two groups.

[0040] The push-back component is used to be arranged between the first orthodontic band 110 and the molar to be pushed back. Since the position of the first orthodontic band 110 is fixed by the abutment tooth, after the push-back component is connected between the first orthodontic band 110 and the molar to be pushed back, it can provide a force for the molar to be pushed back to move in the distal direction.

[0041] The push-back assembly includes a telescopic adjustment device 210, an elastic member, and a second orthodontic band ring 230. The second orthodontic band ring 230 is bonded to the molar to be pushed back. The telescopic adjustment device 210 and the elastic member are sequentially connected between the first orthodontic band ring 110 and the second orthodontic band ring 230. By adjusting the length of the telescopic adjustment device 210, the elastic force of the elastic member can be adjusted, thereby adjusting the push-back force of the push-back assembly on the molar to be pushed back.

[0042] When in use, a personalized molar pushing device is made according to the patient's dentition model. The first orthodontic band 110 is sleeved on the designed abutment, and the second orthodontic band 230 is sleeved on the molar to be pushed back. After the trial wearing is completed, the first orthodontic band 110 can be bonded and fixed to the abutment with glass ionomer cement, and the second orthodontic band 230 can be bonded and fixed to the molar to be pushed back.

[0043] After the first orthodontic band 110 is connected to the abutment tooth, the palatal support component fits tightly against the palate mucosa to reduce the adverse mesial movement of the abutment tooth, thereby providing a stable support for the push-back component.

[0044] During clinical operation, the doctor can directly adjust the length of the telescopic adjustment device 210 in the patient's mouth, and then adjust the pressure applied to the elastic member. On the one hand, the elastic deformation of the elastic member can buffer the rigid mechanical stress and reduce the patient's periodontal damage when pushing the molars back. On the other hand, the compressed elastic member can continuously provide a backward thrust for the molars to be pushed back. During the follow-up visit, the doctor only needs to adjust the length of the telescopic adjustment device 210 in the patient's mouth to achieve the purpose of adjusting the thrust. There is no need to disassemble and re-bond the appliance, which increases the patient's comfort and reduces the requirements for patient compliance. Compared with the prior art, the present invention is easy to operate, reduces the clinical chairside operation time, has relatively less negative impact on the tooth surface and periodontal health, and the direction of pushing the molars is more stable.

[0045] In some embodiments, the palatal support assembly includes a palatal support body 120 and two first orthodontic band rings 110. The two first orthodontic band rings 110 are located on the left and right sides of the palatal support body 120 and are respectively connected to the abutment teeth on the left and right sides. The first orthodontic band rings 110 are connected to the palatal support body 120 through a connecting rod 130.

[0046] When the two first orthodontic bands 110 are respectively connected to the abutment teeth on both sides, the top of the palatal support body 120 fits against the hard palate of the oral cavity. At this time, the palatal support component is firmly supported in the oral cavity and can limit the mesial movement of the abutment teeth.

[0047] In some embodiments, the telescopic adjustment device 210 includes a telescopic component and a length adjustment component.

[0048] The telescopic assembly includes a cylinder 212 and a telescopic rod 211 inserted into the cylinder 212, and the telescopic rod 211 is slidably connected to the cylinder 212. The extended end of the telescopic rod 211 can be connected to the first orthodontic band ring 110, and the end of the cylinder 212 away from the telescopic rod 211 can be connected to the elastic member.

[0049] The length adjustment component is disposed between the barrel 212 and the telescopic rod 211 , and the length adjustment component locks or unlocks the relative position of the telescopic rod 211 and the barrel 212 . When unlocked, the extension length of the telescopic rod 211 is adjustable.

[0050] In some embodiments, the length adjustment assembly may include a fixing hole 213, an adjustment hole 214, and a locking bolt 215. One of the fixing hole 213 and the adjustment hole 214 is provided on the telescopic rod 211, and the other is provided on the cylinder 212. The fixing hole 213 and the adjustment hole 214 extend radially along the cylinder 212 or the telescopic rod 211, respectively. A plurality of adjustment holes 214 are provided, and the plurality of adjustment holes 214 are distributed axially along the cylinder 212 or the telescopic rod 211. When the fixing hole 213 is aligned with one of the adjustment holes 214, the locking bolt 215 is used to enter and exit the fixing hole 213 and the corresponding adjustment hole 214.

[0051] In a specific embodiment, the fixing hole 213 may be provided on the cylinder 212 and located near an end portion close to one end of the telescopic rod 211 , and the fixing hole 213 connects the inner and outer sides of the cylinder 212 along the radial direction of the cylinder 212 .

[0052] The adjustment hole 214 is disposed on the telescopic rod 211 , and a plurality of the adjustment holes 214 are disposed. The plurality of adjustment holes 214 are distributed along the axial direction of the telescopic rod 211 and distributed in the portion of the telescopic rod 211 located in the barrel 212 . The adjustment holes 214 extend along the radial direction of the telescopic rod 211 .

[0053] When the telescopic rod 211 makes axial movement and extension relative to the cylinder 212, each adjusting hole 214 can reach a position directly opposite to the fixing hole 213. When the length of the telescopic assembly is adjusted to a desired length, the adjusting hole 214 adjacent to the fixing hole 213 and close to the cylinder 212 at one end away from the telescopic rod 211 can be aligned with the fixing hole 213, and then the locking bolt 215 is inserted into the fixing hole 213 and the adjusting hole 214 to limit the relative movement of the telescopic rod 211 and the cylinder 212 along the axial direction, thereby locking the length of the telescopic rod 211 and the cylinder 212.

[0054] When the length of the telescopic assembly needs to be adjusted again, the locking bolt 215 can be pulled out from the adjustment hole 214 and the fixing hole 213 to release the restriction on the telescopic rod 211 .

[0055] The fixing hole 213 may be a threaded hole, the adjusting hole 214 may be a smooth hole, and the locking bolt 215 may be threadedly connected to the fixing hole 213 to prevent the locking bolt 215 from coming out.

[0056] Of course, the positions of the fixing hole 213 and the adjusting hole 214 can be interchanged, that is, the fixing hole 213 can be set on the telescopic rod 211 and the adjusting hole 214 can be set on the cylinder 212 .

[0057] When the doctor needs to adjust the backward thrust of the molar to be pushed, the locking bolt 215 can be unscrewed first to unlock the telescopic rod 211, and then the telescopic rod 211 can be pulled outward. When it is extended to the required length, the adjustment hole 214 adjacent to the fixing hole 213 and close to the end of the barrel 212 away from the telescopic rod 211 is aligned with the fixing hole 213, and then the locking bolt 215 is screwed back into the fixing hole 213 and the corresponding adjustment hole 214.

[0058] In some embodiments, the axes of the above-mentioned multiple adjustment holes 214 intersect with the same generatrix of the telescopic rod 211 or the cylinder 212, that is, the multiple adjustment holes 214 are distributed along the axial straight line of the telescopic rod 211 or the cylinder 212.

[0059] Furthermore, a stop slider 2111 can be set on one of the outer side surface of the telescopic rod 211 and the inner side surface of the cylinder 212, and a stop groove 2121 can be set on the other one. The stop slider 2111 is slidably connected to the stop groove 2121, and the stop groove 2121 extends along the axial direction of the telescopic rod 211 or the cylinder 212.

[0060] Specifically, a stop slider 2111 can be set on the outer side of one end of the telescopic rod 211 located in the cylinder 212. The stop slider 2111 extends radially along the telescopic rod 211, and the extension direction can be perpendicular to the extension direction of the adjustment hole 214 located on the telescopic rod 211.

[0061] A rotation-stopping groove 2121 is provided on the inner side of the cylinder 212 . The rotation-stopping groove 2121 extends along the axial direction of the cylinder and penetrates one end of the telescopic rod 211 . The rotation-stopping groove 2121 is provided at an interval of 90 degrees from the fixing hole 213 .

[0062] When connecting, align the anti-rotation slider 2111 of the telescopic rod 211 with the anti-rotation slide groove 2121 of the cylinder 212 and insert it. At this time, the anti-rotation slider 2111 is slidably connected with the anti-rotation slide groove 2121.

[0063] The telescopic rod 211 and the cylinder 212 are restricted by the anti-rotation slider 2111 and the anti-rotation groove 2121, and can only move relative to each other along the axial direction, but cannot rotate around their own axis. In this way, the multiple adjustment holes 214 located on the telescopic rod 211 will pass through the position corresponding to the fixed hole 213 during the telescopic rod 211 extension and retraction process.

[0064] In some embodiments, the length adjustment assembly may further include an internal thread and an external thread, the external thread being arranged on the outside of the portion of the telescopic rod 211 located inside the cylinder 212, the internal thread being arranged on the inner wall of the cylinder 212, and the telescopic rod 211 and the cylinder 212 being connected by threads. The extended end of the telescopic rod 211 may be rotatably connected to the first orthodontic band 110, the rotation axis being colinear with the axis of the telescopic rod 211, and the end of the cylinder 212 away from the telescopic rod 211 being fixedly connected to the elastic member, and connected to the second orthodontic band 230 through the elastic member.

[0065] When the extension length of the telescopic rod 211 needs to be adjusted, the telescopic rod 211 can be directly rotated in the patient's mouth. Since the cylinder 212 cannot rotate, the rotation of the telescopic rod 211 is converted into an extension or retraction movement along the axial direction of the telescopic rod 211 under the action of the thread.

[0066] Of course, the end of the cylinder 212 away from the telescopic rod 211 can also be rotatably connected to the elastic member, and the end of the telescopic rod 211 away from the cylinder 212 is fixedly connected to the first orthodontic band ring 110. When adjusting the length of the telescopic assembly, the cylinder 212 needs to be rotated.

[0067] Since the elastic member is prone to elastic deformation, the elastic member is prone to twisting when the telescopic rod 211 or the cylinder 212 is rotated. Therefore, a clamping portion may be provided on the outer sides of the telescopic rod 211 and the cylinder 212 .

[0068] For example, the clamping part may be an external hexagonal nut fixedly connected to the telescopic rod 211 and the barrel 212, the telescopic rod 211 being a rotating part and the barrel 212 being a fixed part. When the length needs to be adjusted, a wrench may be used to fix the barrel 212 to make it absolutely fixed, and another wrench may be used to rotate the telescopic rod 211 to adjust the length of the telescopic adjustment device.

[0069] It should be noted that, since the elastic member is in a compressed state, the elastic force of the elastic member can provide an extrusion force for the telescopic rod 211 and the barrel 212, thereby increasing the friction between the contact surfaces of the internal thread and the external thread, so that the telescopic rod 211 and the barrel 212 can be self-locked, and the telescopic rod 211 and the barrel 212 can be ensured not to rotate in the opposite direction without external force intervention. Of course, the smaller the thread angle of the internal thread and the external thread, the smaller the pitch, the better the self-locking effect. When it is necessary to adjust the extension length of the telescopic rod 211, it is only necessary to use a tool such as a wrench to overcome the friction between the internal thread and the external thread to make the telescopic rod 211 and the barrel 212 rotate relative to each other.

[0070] In some embodiments, under normal circumstances, the telescopic adjustment device 210 and the elastic member are generally connected to the palatal side of the first orthodontic band 110 and the second orthodontic band 230. However, when there is an ectopic tooth obstructing the palatal side of the abutment tooth and the molar to be pushed back, the telescopic adjustment device 210 and the elastic member can be installed on the buccal side.

[0071] In a specific embodiment, the elastic member may be a spring 220 .

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A device for pushing molars backwards, characterized in that: include: A palatal support assembly comprises a first orthodontic band ring (110) for being connected to abutment teeth on both sides; A push-back assembly comprises one or two groups, which are used to be installed between the first orthodontic band ring (110) and the molar to be pushed back on one side or both sides, and each group of the push-back assembly comprises a telescopic adjustment device (210), an elastic member and a second orthodontic band ring (230), the second orthodontic band ring (230) being used to be connected to the molar to be pushed back, the telescopic adjustment device (210) and the elastic member are arranged between the first orthodontic band ring (110) and the second orthodontic band ring (230), and the elastic member is used to provide an elastic force to move the first orthodontic band ring (110) and the second orthodontic band ring (230) away from each other.

2. The device for pushing molars backward according to claim 1, characterized in that: The palatal support assembly includes a palatal support body (120) and at least two of the first orthodontic band rings (110). The top of the palatal support body (120) is used to fit with the hard palate of the oral cavity. The plurality of the first orthodontic band rings (110) are arranged on the left and right sides of the palatal support body (120), and are all connected to the palatal support body (120) via a connecting rod (130).

3. The device for pushing molars backward according to claim 1, characterized in that: The telescopic adjustment device (210) comprises: A telescopic assembly, comprising a cylinder (212) and a telescopic rod (211), wherein the telescopic rod (211) is slidably arranged in the cylinder (212), and ends of the telescopic rod (211) and the cylinder (212) that are away from each other are respectively connected to the first orthodontic band ring (110) and the elastic member; A length adjustment component is arranged between the cylinder (212) and the telescopic rod (211) and is used to adjust or fix the extension length of the telescopic rod (211).

4. The device for pushing molars backward according to claim 3, characterized in that: The length adjustment component comprises a fixing hole (213), an adjusting hole (214) and a locking bolt (215); one of the fixing hole (213) and the adjusting hole (214) is arranged on the telescopic rod (211), and the other is arranged on the cylinder (212); the fixing hole (213) and the adjusting hole (214) respectively extend along the radial direction of the cylinder (212) or the telescopic rod (211); a plurality of the adjusting holes (214) are arranged, and the plurality of the adjusting holes (214) are distributed along the axial direction of the cylinder (212) or the telescopic rod (211); when the fixing hole (213) is aligned with one of the adjusting holes (214), the locking bolt (215) is used to enter and exit the fixing hole (213) and the corresponding adjusting hole (214).

5. The device for pushing molars backward according to claim 4, characterized in that: The axes of the plurality of adjustment holes (214) intersect with the same generatrix of the telescopic rod (211) or the cylinder (212) where they are located.

6. The device for pushing molars backward according to claim 5, characterized in that: One of the outer side surface of the telescopic rod (211) and the inner side surface of the cylinder (212) is provided with a rotation-stopping slider (2111), and the other is provided with a rotation-stopping groove (2121), the rotation-stopping slider (2111) is slidably connected to the rotation-stopping groove (2121), and the rotation-stopping groove (2121) extends along the axial direction of the telescopic rod (211) or the cylinder (212).

7. The device for pushing molars backward according to claim 3, characterized in that: The length adjustment component comprises an external thread arranged on a portion of the telescopic rod (211) located inside the cylinder (212) and an internal thread arranged on an inner wall of the cylinder (212); the telescopic rod (211) is threadedly connected to the cylinder (212); one of the telescopic rod (211) and the cylinder (212) is rotatably connected to the corresponding first orthodontic band ring (110) or the second orthodontic band ring (230), and the rotation axis is colinear with the rotation axis of the telescopic rod (211); and the other is connected to the corresponding second orthodontic band ring (230) or the first orthodontic band ring (110) through the elastic member.

8. The device for pushing molars backward according to claim 7, characterized in that: The outer sides of the telescopic rod (211) and the cylindrical body (212) are both provided with clamping parts for anti-rotation connection with a rotating tool.

9. The device for pushing molars backward according to claim 1, characterized in that: The telescopic adjustment device (210) and the elastic member are arranged on the palate side or the buccal side of the first orthodontic band ring (110) and the second orthodontic band ring (230).

10. The device for pushing molars backward according to any one of claims 1 to 9, characterized in that: The elastic member is a spring (220).

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