Detachable tail end molar depressing device

Abstract

The invention relates to a removable tail end molar depressing device which comprises a base plate arranged on the palate, a clamping ring fixed to the base plate and a depressing structure fixed to the base plate, canine teeth or premolar teeth are sleeved with the clamping ring, the depressing structure comprises two sets of stress application parts and two sets of depressing parts, the stress application parts are arranged on the two sides of the buccal tongue of the molar teeth respectively, and the depressing parts are arranged on the two sides of the buccal tongue of the molar teeth respectively. Each stress application part comprises a coil spring, a sleeve, a side arm and a vertical arm which are connected in sequence, the coil spring is provided with two extension arms, the two extension arms are fixedly connected with the base and the sleeve respectively, and the side arm is slidably connected into the sleeve; the sleeve is extruded to deform, the inner wall of the sleeve clamps the side arm, and the sleeve and the side arm are relatively fixed; the pressing part is arranged on the molar occlusal surface and comprises a cross arm for connecting the two vertical arms; the coil spring exerts downward force on the cross arm, and the cross arm acts on the molars to press down the molars.

Description

Technical Field

[0001] The present invention relates to a removable distal molar intrusion device, belonging to the technical field of orthodontics. Background Art

[0002] Teeth may be missing due to reasons such as caries, periodontitis, trauma, etc. If not repaired for a long time, the opposing teeth will gradually elongate. In severe cases, it may even bite the gingiva at the missing tooth site, resulting in insufficient repair space and causing difficulties in repair.

[0003] For the elongated teeth, the method of root canal treatment combined with crown restoration can be used to reduce the tooth height. Since this method causes relatively large damage to the teeth, patients often find it difficult to accept. Or orthodontic treatment can be used to intrude the elongated teeth. Currently, the most commonly used method for intruding elongated teeth is to use micro-implant anchorage for intrusion. For non-distal molars, it is relatively easy to implant micro-implant anchorage both proximally and distally. However, for distal molars, due to anatomical factors, it is often very difficult to implant micro-implant anchorage distally in distal molars, or the implantation risk is relatively high, and it is easy to damage important nerves and blood vessels. The intrusion of distal molars has become a difficult point and pain point in orthodontic clinical treatment.

[0004] Currently, most methods for intruding distal molars are bonded fixed orthodontic methods, which require the design of cast or 3D printed metal traction hooks and the combination of micro-implant anchorage pins for treatment. Moreover, due to anatomical factors, it is often only possible to treat the intrusion of maxillary distal molars and impossible to treat the intrusion of mandibular elongated distal molars. For the existing devices for intruding distal molars, patients often cannot remove them by themselves, the comfort is relatively poor, and the treatment cost is very high. The professional technical requirements are very high, and it requires professional orthodontists to operate. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a removable intrusion device applicable to the upper and lower distal molars and is easy to remove.

[0006] To achieve the above object, the technical solution proposed by the present invention is: a removable distal molar intrusion device, including a base plate disposed on the palate, a clasp fixed on the base plate, and an intrusion structure fixed on the base plate. The clasp is sleeved on the canine or premolar. The intrusion structure includes a force-applying part and an intrusion part. The force-applying part is provided with two groups respectively disposed on both the buccal and lingual sides of the molar. Each group of the force-applying part includes a coil spring, a sleeve, a side arm, and a vertical arm connected in sequence. The coil spring is provided with two extension arms, and the two extension arms are respectively fixedly connected to the base plate and the sleeve. The side arm is slidably connected to the sleeve. Squeezing the sleeve deforms the sleeve, the inner wall of the sleeve clamps the side arm, and the sleeve and the side arm are relatively fixed. The intrusion part is disposed on the occlusal surface of the molar and includes a cross arm connecting the two vertical arms. The coil spring applies a downward intrusion force to the molar through the cross arm to intrude the molar.

[0007] A further design of the above technical solution is that: the vertical arm is provided with a U-shaped curve.

[0008] The openings of the U-shaped curves are connected by ligature wires.

[0009] The longitudinal section of the sleeve is oval.

[0010] The sleeve is a closed oval tube or an oval tube with a notch formed by bending a thin metal sheet.

[0011] The pressing part further includes a gasket, one side of the gasket is matched with the shape of the occlusal surface of the molar, and the other side is connected to the transverse arm.

[0012] The gasket includes two inner and outer half pieces. When in use, at least one half piece is arranged between the occlusal surface of the molar and the transverse arm.

[0013] Each half piece of the gasket is provided with a clamping groove on the side close to the transverse arm, and the transverse arm is embedded in the clamping groove.

[0014] The gasket is welded to the transverse arm.

[0015] The clasp is provided with a pushing part that bends and extends outward at the buccal side of the canine tooth.

[0016] The beneficial effects of the technical solution of the present invention compared with the prior art are as follows: The pressing device of the present invention is fixed by fitting to the base plate of the upper palate or mandible and cooperating with the clasp to cover the canines on both sides of the upper or lower jaw, providing support for applying force to the pressing structure. The installation and removal of this fixed structure are simple, and the patient can operate it by himself, which is convenient for daily use.

[0017] Since the fixed structure of the pressing device is arranged on the canine tooth and the palate, the pressing device can be arranged on the upper or lower jaw to perform pressing treatment on the terminal molars of the upper and lower jaws.

[0018] In the pressing device of the present invention, the force-applying parts on both the buccal and lingual sides of the molar are provided with sleeves and side arms that slide in the sleeves. When in use, the side arms can be slid according to the specific position of the molar to adjust the mesiodistal position of the pressing part. After adjustment, the sleeve is squeezed to deform and fix, so as to adapt to the mesiodistal position of the molar.

[0019] In the pressing device of the present invention, the vertical arms on both the buccal and lingual sides of the molar are provided with U-shaped curves. By adjusting the size of the opening of the U-shaped curve, the height of the pressing part connected to the vertical arm can be adjusted to adapt to the height of the molar. At the same time, as the correction progresses and the molar gradually lowers, the pressing force generated by the coil spring on the molar will gradually decrease. By narrowing the opening of the U-shaped curve and fixing it with a ligature wire, the height of the pressing part is reduced, and the pressing force can be increased.

[0020] In the intrusion device of the present invention, a gasket is provided in the intrusion part. Using a complete gasket facilitates the overall intrusion of molars; using a single-piece gasket can cause the molars to tilt lingually or buccally while intruding the molars. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 FIG. is a schematic diagram of the usage state of the terminal molar intrusion device of the present invention; Figure 2 is Figure 1 partial enlarged view of; Figure 3 FIG. is a side view of the terminal molar intrusion device of the present invention; Figure 4 FIG. is a schematic cross-sectional view of the sleeve and the side arm in Embodiment 1; Figure 5 FIG. is a schematic cross-sectional view of the sleeve and the side arm in Embodiment 2; Figure 6 FIG. is a schematic diagram of the usage state of the gasket in Embodiment 3; Figure 7 FIG. is a schematic diagram of the usage state of the gasket in Embodiment 4; In the figures: 1 - base plate, 2 - clasp, 21 - pushing part, 3 - intrusion structure, 31 - coil spring, 32 - sleeve, 33 - side arm, 34 - vertical arm, 341 - U-shaped bend, 35 - cross arm, 36 - gasket, 361 - inner gasket, 362 - outer gasket, 363 - card slot, 4 - ligature wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Embodiment 1

[0023] The removable terminal molar intrusion device of this embodiment is described taking the upper jaw as an example. As Figure 1 and Figure 3 shown, it includes a base plate 1, a clasp 2 and an intrusion structure 3. As Figure 1 , the base plate 1 is attached to the palate (if the intrusion device is set in the lower jaw, it is attached to the corresponding position of the lower jaw). The clasp 2 is fixed on the base plate 1 and is sleeved on the canines or premolars on both sides of the upper jaw (if the intrusion device is set in the lower jaw, it is correspondingly set on the canines or premolars on both sides of the lower jaw). The intrusion structure 3 is fixed on the base plate 1. In this embodiment, the base plate 1 and the clasp 2 together play the role of anchorage, and the fixing structure with the oral cavity and teeth is simple. The patient can remove and install it by himself, which is convenient for daily use and cleaning.

[0024] Combined with Figure 2As shown, the intrusion structure 3 includes two parts corresponding to the molars on both sides (only the unilateral part can also be set according to the actual needs of the patient). Each part includes a force - applying part and an intrusion part. The force - applying part is provided with two groups respectively arranged on the buccal and lingual sides of the molars. Each group of the force - applying part includes a coil spring 31, a sleeve 32, a side arm 33 and a vertical arm 34 connected in sequence. The coil spring 31 is provided with two extension arms, and the two extension arms are respectively fixedly connected to the base plate 1 and the sleeve 32. The side arm 33 is slidably connected to the sleeve 32. Through the coil spring 31, the sleeve 32 and the side arm 33, the position of the vertical arm 34 is extended to the middle of the buccal and lingual sides of the molar, and the vertical arm 34 is arranged along the length direction of the molar. The intrusion part includes a cross - arm 35 connecting the vertical arms 34 on both the buccal and lingual sides. The cross - arm 35 is arranged on the occlusal surface of the molar. The torque of the coil spring 31 is transmitted to the cross - arm 35 through the sleeve 32, the side arm 33 and the vertical arm 34. A downward intrusion force is applied to the molar through the cross - arm 35 to intrude the molar. In this embodiment, the side arm 33, the vertical arm 34 and the cross - arm 35 are formed by bending the same section of arch wire.

[0025] Combined with Figure 4 As shown, in this embodiment, the longitudinal section of the sleeve 32 is a closed ellipse (it can also be circular, etc.). The inner hole size is slightly larger than the diameter of the side arm 33. Slide the side arm 33 along the sleeve 32 to adjust the mesiodistal position of the vertical arm 34 so that the position of the vertical arm 34 is located in the middle of the buccal and lingual sides of the molar. At this time, use tools such as pliers to squeeze the outer wall of the sleeve 32 to deform the sleeve 32. The inner wall of the sleeve 32 clamps the side arm 33 to make the sleeve 32 and the side arm 33 relatively fixed, so as to fix the vertical arm 34 and the cross - arm 35 in the middle of the molar. When the patient removes and installs it by himself, the acting position of the cross - arm 35 can be ensured to remain unchanged. Embodiment Two

[0026] This embodiment is further designed based on the scheme of Embodiment One. As Figure 1 、 Figure 2 and Figure 3 As shown, in this embodiment, a U - shaped bend 341 is provided on the vertical arm 34. As the orthodontic treatment progresses, the molar will gradually lower, and the intrusion force generated by the coil spring 31 on the molar will gradually decrease. In this embodiment, the distance between the openings of the U - shaped bend 341 can be reduced by pressing the U - shaped bend 341, so as to lower the height of the cross - arm 35 to adapt to the lowered molar, increase the intrusion force, and the two ends of the opening of the U - shaped bend can be connected and fixed by a ligature wire 4 to maintain the height of the cross - arm 35 and maintain the intrusion force. In the initial stage of using this embodiment, the size of the opening of the U - shaped bend 341 can also be adjusted to adapt to the height of the molar.

[0027] In this embodiment, a pushing part 21 that bends and extends outward is provided at the buccal side of the clasp 2 corresponding to the canine. During removal and installation, the pushing part 21 can be pushed for operation.

[0028] As Figure 5As shown in the figure, in this embodiment, the sleeve is bent from a thin metal sheet, and its longitudinal section is an elliptical tube with a notch, which is convenient for clinical production. The usage method and function are the same as those in the first embodiment. Embodiment Three

[0029] This embodiment is further designed based on the solution of the first embodiment. As Figure 6 shown in the figure, the depressing part of this embodiment further includes a gasket 36 arranged between the occlusal surface of the molar and the cross arm 35. The shape of the side of the gasket 36 close to the molar matches the occlusal surface of the molar, and the other side is welded to the cross arm 35, which is convenient for overall depressing of the molar. Embodiment Four

[0030] This embodiment is further designed based on the solution of the third embodiment. As Figure 7 shown in the figure, the gasket includes two inner and outer half pieces, namely the inner gasket 361 and the outer gasket 362. Both half pieces of the gasket are provided with clamping grooves 363 on the side close to the cross arm, and the cross arm 35 is embedded in the clamping grooves to be fixed to the gasket.

[0031] During use, both gaskets can be arranged on the occlusal surface of the molar to overall depress the molar, or only the inner gasket 361 or the outer gasket 362 can be arranged to make the molar tilt lingually or buccally while depressing the molar.

[0032] The technical solution of the present invention is not limited to the above embodiments, and all technical solutions obtained by equivalent replacement fall within the scope of protection required by the present invention.

Claims

1. A removable distal molar intrusion device, characterized in that: It includes a base plate disposed on the palate, a clasp fixed on the base plate, and a depressing structure fixed on the base plate. The clasp is sleeved on the canine or premolar. The depressing structure includes a force-applying part and a depressing part. The force-applying part is provided with two groups respectively disposed on the buccal and lingual sides of the molar. Each group of the force-applying part includes a coil spring, a sleeve, a side arm, and a vertical arm connected in sequence. The coil spring is provided with two extension arms, and the two extension arms are respectively fixedly connected to the base plate and the sleeve. The side arm is slidably connected in the sleeve; the sleeve is deformed by squeezing the sleeve, the inner wall of the sleeve clamps the side arm, and the sleeve and the side arm are relatively fixed; the depressing part is disposed on the occlusal surface of the molar and includes a cross arm connecting the two vertical arms; the coil spring applies a downward depressing force to the molar through the cross arm to depress the molar.

2. The removable distal molar intrusion device according to claim 1, wherein: The vertical arm is provided with a U-shaped bend.

3. The removable distal molar intrusion device according to claim 2, characterized in that: The openings of the U-shaped bends are connected by ligature wires.

4. The removable distal molar intrusion device according to claim 1, wherein: The longitudinal section of the sleeve is elliptical.

5. The removable distal molar intrusion device according to claim 4, wherein: The sleeve is a closed elliptical tube or an elliptical tube with a notch formed by bending a thin metal sheet.

6. The removable distal molar intrusion device according to claim 1, wherein: The depressing part further includes a gasket. One side of the gasket matches the shape of the occlusal surface of the molar, and the other side is connected to the cross arm.

7. The removable distal molar intrusion device according to claim 6, wherein: The gasket includes two inner and outer half pieces. When in use, at least one half piece is disposed between the occlusal surface of the molar and the cross arm.

8. The removable distal molar intrusion device according to claim 7, wherein: Each half piece of the gasket is provided with a card slot on the side close to the cross arm, and the cross arm is embedded in the card slot.

9. The removable distal molar intrusion device according to claim 6, wherein: The gasket is welded to the cross arm.

10. The removable distal molar intrusion device according to any one of claims 1 to 9, characterized in that: The clasp is provided with a pushing part that bends and extends outward at the buccal side corresponding to the canine.

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