Self-ligating bracket

Abstract

The invention relates to a self-ligating bracket which comprises a bracket body, the bracket body is provided with a base plate, an arch wire groove and a sliding locking plate, and the self-ligating bracket is characterized in that the sliding locking plate is provided with a locking plate cover plate covering the arch wire groove in a locked state, and the contact area of the locking plate cover plate and an arch wire is relatively small through a preset shape; therefore, the friction force between the two is reduced. According to the self-ligating bracket, on one hand, friction force can be reduced, efficient movement of teeth under light-force correction can be achieved, due to the fact that the self-ligating bracket has a large groove space, tooth extraction gap closing and aligning and leveling under double arch wires can be achieved at the same time, the correction time can be greatly shortened, on the other hand, full deformation of the arch wires in the ligating state can be achieved, and the orthodontic effect is good. The efficient control of the teeth is realized, and the teeth are fully arranged and leveled.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to a self-locking bracket for tooth correction. Background Art

[0002] A bracket is an important component of the fixed orthodontic technique. It is an appliance used to correct dental malocclusions. The arch wire applies various types of corrective forces to the teeth through the bracket. The main function of the bracket is to fix the arch wire, so that the arch wire can better play its role, transmit the corrective force, and thus control the three-dimensional movement of the teeth to achieve the purpose of orthodontic treatment.

[0003] Traditional brackets are fixed by ligating the arch wire in the main slot groove of the bracket. However, this will result in a relatively large frictional force between the bracket and the arch wire, affecting the movement of the teeth during the orthodontic treatment. There are various self-locking brackets currently available on the market. Different from the traditional ligated brackets, a sliding lock piece is provided on the bracket body, and the arch wire is locked with the bracket through the sliding lock piece. Compared with the traditional ligated brackets, the self-locking brackets can eliminate the operation of ligating the arch wire with ligature wire by the doctor during the treatment, greatly shortening the operation time and improving the treatment operation efficiency.

[0004] However, the existing self-locking brackets still generally have the following two problems: On the one hand, because the contact area between the arch wire in the arch wire groove and the sliding lock piece is relatively large, the frictional force becomes larger. When closing the extraction space by tooth movement, the efficiency of tooth movement will be reduced. At the same time, a relatively large corrective force needs to be used, and in severe cases, damage to the periodontal tissue of the teeth may occur, which poses certain difficulties for aligning and leveling the teeth.

[0005] On the other hand, the box-shaped space formed after the self-locking bracket is locked is relatively large, and the clearance between its slot groove and the arch wire is relatively large. This makes the deformation of the arch wire insufficient after it is inserted into the slot groove, and the aligning and leveling performance cannot be fully expressed; especially when using a relatively thin nickel-titanium wire or stainless steel wire at the initial stage, the arch wire cannot undergo sufficient deformation, and the corrective force of the arch wire cannot be fully expressed, resulting in the inability to fully align and level the teeth.

[0006] It can be seen that although the self-locking bracket has brought different changes to the orthodontic technology, it still cannot well solve the contradiction of reducing the frictional force to achieve tooth movement under light force while being able to precisely control the teeth. Summary of the Invention

[0007] The present invention aims to solve the above-mentioned various problems, and further provides a self-locking bracket.

[0008] To solve the above problems, the technical solution adopted by the present invention is: A self-locking bracket, comprising a base plate and a bracket body above it. The middle of the bracket body has an arch wire groove. Above the bracket body on one side of the arch wire groove, a sliding lock piece is installed. The sliding lock piece has a lock piece cover plate that covers and closes above the arch wire groove in the locked state. It is characterized in that When the sliding lock piece is in the locked state, the shape of the lock piece cover plate should meet the following requirements: when the lock piece cover plate contacts the arch wire, the lock piece cover plate has a relatively smaller contact area with the arch wire or the arch wire has a relatively shorter contact distance with the lock piece cover plate.

[0009] Furthermore, the shape of the lock piece cover plate adopts any one of a trapezoid, an inclined rectangle, an I-shaped, a rhombus, and a mesiodistal double-concave arc-shaped.

[0010] Furthermore, the mesial crown side and the mesial labiobuccal side of the lock piece cover plate change the traditional planar structure to an arc-shaped structure, and the arc-shaped structures on both sides are convex towards the labiobuccal side. This structure can, on the one hand, increase the comfort of the mucosa, and on the other hand, effectively increase the space in the arch wire groove, increase the clearance between the arch wire and the groove, not only can reduce the friction between the lock piece cover plate and the arch wire, but also is more suitable for the orthodontic operation of using double arch wires in the same arch wire groove.

[0011] Furthermore, a vertical hole is opened in the middle of the wing post of the bracket body in the gingivolingual direction.

[0012] Furthermore, during the process of correcting rotated teeth, the ligature wire is ligated to the mesial or distal wing of the lingual rotation of the tooth through the vertical hole closer to the tooth crown.

[0013] Furthermore, during the process of correcting rotated teeth, a tooth uprighting spring is placed in the vertical hole.

[0014] Furthermore, an insertable traction hook is inserted into the vertical hole and used in combination with an elastic chain or a tension spring, etc. It can achieve the uprighting of teeth while moving inclined teeth. For example, when a tooth with a distally inclined crown needs to move distally, the traction part of the insertable traction hook is placed on the gingival side of the bracket, and when the elastic chain applies force to the traction hook to move the tooth distally, the uprighting of the tooth can be achieved simultaneously; conversely, when a tooth with a mesially inclined crown needs to move distally, the elastic chain is connected to the traction part of the insertable traction hook on the occlusal side of the bracket.

[0015] Furthermore, arc-shaped concave grooves are formed on the four edges of the wing post of the bracket body. The arc-shaped concave grooves are used to guide the ligature wire to slide towards the bottom of the bracket, so that the arch wire can obtain the maximum deformation and more fully express.

[0016] A self-locking bracket of the present invention, on the one hand, by reducing the area of the locking piece cover plate and changing the near-crown side of the locking piece cover plate from a plane to an arc surface, it can reduce friction and achieve efficient movement of teeth under light force orthodontics. And because it has a larger groove space, it can simultaneously close the extraction space and level and align the teeth under double arch wires, which can greatly shorten the orthodontic time; on the other hand, a vertical hole in the gingival-junctional direction is opened in the middle of the wing column of the bracket body, and the four edges of the wing column of the bracket body are set as arc-shaped concave grooves, so that the self-locking bracket can simultaneously achieve sufficient deformation of the arch wire in the ligated state and achieve efficient control of teeth, achieving sufficient leveling and alignment of teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 : Schematic structural diagram of the self-locking bracket of Example 1 (the locking piece cover plate is an inclined rectangle); Figure 2 : Schematic structural diagram of the self-locking bracket of Example 1 (the locking piece cover plate is a trapezoid); Figure 3 : Schematic structural diagram of the self-locking bracket of Example 1 (the locking piece cover plate is an arc-shaped surface with double concavities in the mesial-distal direction); Figure 4 : Schematic structural diagram of the self-locking bracket of Example 1 (correcting rotated teeth by ligating through the central vertical hole of the wing column); Figure 5 : Schematic structural diagram of the self-locking bracket of Example 1 (correcting rotated teeth by the uprighting spring through the central vertical hole); Figure 6 : Schematic structural diagram of the self-locking bracket of Example 1 (the insertable traction hook is inserted into the central vertical hole and used in combination with a rubber chain to simultaneously orthodont the teeth while moving the inclined teeth); In the figure, 1, base plate, 2, arch wire groove, 3, sliding locking piece, 3a, locking piece cover plate, 3a1, arc-shaped surface structure on the near-crown side, 4, central vertical hole, 5, arc-shaped concave groove, 6, arch wire, 7, ligature wire, 8, uprighting spring, 9, insertable traction hook, 10, rubber chain. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present invention will be described in detail below with reference to the drawings.

[0019] Example 1 A self-locking bracket, as Figure 1 shown, includes a bracket body, a base plate 1 provided at the bottom of the bracket body, and an arch wire groove 2 opened on the bracket body. A sliding locking piece 3 is further provided above the bracket body, and the sliding locking piece 3 opens and closes the arch wire groove 2 by sliding; therefore, the sliding locking piece 3 has a locking position, and in the locking position, the sliding locking piece 3 forms a locking piece cover plate 3a covering the arch wire groove 2 above the arch wire groove 2, and the locking piece cover plate 3a contacts and frictions with the arch wire in the arch wire groove 2.

[0020] When the sliding locking piece 3 is in the locked state, the archwire 6 and the locking piece cover plate 3a above the archwire slot 2 generate a certain friction force due to contact. This friction force increases as the contact area between the two increases, which will generate a certain resistance to the movement of teeth during the correction process. To this end, this embodiment adopts two technical measures: on the one hand, the shape of the locking piece cover plate 3a above the archwire slot 2 is changed to reduce the contact area between the locking piece cover plate 3a and the archwire 6; on the other hand, the two sides of the locking piece cover plate 3a above the archwire slot 2 (the proximal tooth crown side and the proximal labial cheek side) are changed from a flat structure to an arc surface convex to the labial cheek side. The arc surface structure of the proximal labial cheek side can increase the comfort of the labial cheek mucosa, and the arc surface structure 3a1 of the proximal tooth crown side allows a larger clearance to be formed in the groove of the archwire slot, so that double archwires can be used in the same groove, so that the alignment and leveling and the closing of the extraction gap can be carried out simultaneously, greatly shortening the correction time.

[0021] In the present embodiment, the shape of the locking plate cover 3a above the archwire slot 2 is changed by changing the original rectangle into an oblique rectangle with half the area. The area of the oblique rectangle in contact with the archwire is reduced by half compared to the original rectangle, thereby effectively reducing friction and achieving efficient movement of teeth under smaller traction force, making the correction process safer and more efficient.

[0022] It should be understood that the shape of the locking plate cover plate 3a above the archwire slot 2 may also be changed, such as being set to an I-shaped, trapezoidal, diamond-shaped, or a biconcave arc shape. Such deformation of the locking plate cover plate 3a can effectively reduce the contact area and friction between the archwire and the locking plate cover plate 3a.

[0023] Due to the different ligation methods after the archwire is placed in the groove, compared with the square wire and straight wire brackets, the traditional sliding lock plate 3 forms a larger box-like space in the groove of the archwire slot 2 when in the locked state, and the gap between the groove and the archwire is larger, which makes the deformation of the archwire 6 insufficient after being inserted into the groove, and the alignment and leveling performance cannot be fully expressed, especially when the thinner nickel-titanium wire or stainless steel wire is used initially, the archwire cannot be fully deformed, and the correction force of the archwire cannot be fully expressed, resulting in the inability to fully align and level the teeth. To this end, the technical measures taken in this embodiment are: a central vertical hole 4 is opened on the bracket body, and the central vertical hole 4 is ligated with the mesial wing or distal wing of the lingual rotation of the tooth through the ligation wire 7. Since the central vertical hole 4 is closer to the crown of the tooth, the ligation is tighter, and the deformation of the archwire is more sufficient, so that the correction force can be fully expressed, the torsion accuracy of the teeth can be better controlled, and a better alignment and leveling effect in the three-dimensional direction of the teeth can be achieved, thereby changing the problem that the self-ligating bracket cannot efficiently control the direction of the teeth.

[0024] The ligature wire can directly pass through the central vertical hole 4 and is used to suspend severely malpositioned teeth such as lingually displaced, high-positioned, and low-positioned teeth, making the operation simpler and more convenient. When the insertion type traction hook 9 is inserted into the central vertical hole 4 and used in combination with the rubber chain 10, the uprighting of the teeth can be achieved while moving the inclined teeth. When the uprighting spring 8 is placed in the central vertical hole 4, it is beneficial to correct the rotated teeth.

[0025] In order to make the performance of the arch wire in the above ligature scheme be expressed more fully, in this embodiment, the four edges of the bracket wing post are formed into arc-shaped concave grooves 5. When ligating, the ligature wire will slide along the arc-shaped concave grooves 5 towards the bottom of the bracket, so that the arch wire 6 deforms to the greatest extent.

Claims

1. A self-locking bracket, comprising a base plate and a bracket body above it. The middle of the bracket body has an arch wire groove. Above the bracket body on one side of the arch wire groove, a sliding lock piece is installed. The sliding lock piece has a lock piece cover plate that covers and closes above the arch wire groove in the locked state. It is characterized in that, When the sliding lock piece is in the locked state, the shape of the lock piece cover plate should satisfy that when the lock piece cover plate contacts the arch wire, the lock piece cover plate has a relatively smaller contact area with the arch wire or the arch wire has a relatively shorter contact distance with the lock piece cover plate.

2. The self-locking bracket according to claim 1, characterized in that, The shape of the lock piece cover plate is any one of a trapezoid, an inclined rectangle, an I-shaped, a rhombus, and a mesiodistal double-concave arc-shaped.

3. The self-locking bracket according to claim 1, characterized in that, The mesial crown side and the mesial labiobuccal side of the lock piece cover plate are changed from the traditional planar structure to an arc-shaped structure, and the arc-shaped structures on both sides protrude towards the labiobuccal side.

4. The self-locking bracket according to claim 1, characterized in that, A vertical hole extending in the gingivolingual direction is provided in the middle of the wing post of the bracket body.

5. The self-locking bracket according to claim 4, characterized in that, During the process of correcting rotated teeth, the ligature wire is ligated to the mesial or distal wing of the lingual rotation of the tooth through the vertical hole closer to the tooth crown.

6. The self-locking bracket according to claim 5, characterized in that, During the process of correcting rotated teeth, an upright spring is placed in the vertical hole.

7. The self-locking bracket according to claim 6, characterized in that, By combining the vertical hole with an insertable traction hook and an elastic chain or a tension spring, the upright axis of the tooth can be achieved while moving the inclined tooth.

8. The self-locking bracket according to claim 1, characterized in that, Arc-shaped concave grooves are formed at the four edges of the wing post of the bracket body. The arc-shaped concave grooves are used to guide the ligature wire to slide towards the bottom of the bracket, so that the arch wire can obtain the maximum deformation.

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