CN111888019B - Self-ligating brackets with full archwire coverage - Google Patents
Self-ligating brackets with full archwire coverage Download PDFInfo
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- CN111888019B CN111888019B CN202010876521.9A CN202010876521A CN111888019B CN 111888019 B CN111888019 B CN 111888019B CN 202010876521 A CN202010876521 A CN 202010876521A CN 111888019 B CN111888019 B CN 111888019B
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- cover plate
- locking
- clamping position
- locking piece
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C7/00—Orthodontics, i.e. obtaining or maintaining the desired position of teeth, e.g. by straightening, evening, regulating, separating, or by correcting malocclusions
- A61C7/12—Brackets; Arch wires; Combinations thereof; Accessories therefor
- A61C7/14—Brackets; Fixing brackets to teeth
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Clamps And Clips (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Abstract
The application discloses a self-locking bracket fully covered by an arch wire groove, which comprises a net bottom, a base body provided with the arch wire groove and a cover plate arranged on the base body in a sliding manner, wherein one side of the base body, which is away from the net bottom, is provided with a sliding rail matched with the cover plate, the cover plate is arranged on the sliding rail, two locking surfaces which are oppositely arranged are arranged in the width direction of the sliding rail, each locking surface is provided with an elastic locking piece, the matched part of the cover plate and the locking surface is a guiding surface, the guiding surface is provided with an anti-falling clamping position and a positioning clamping position, the locking piece is clamped with the anti-falling clamping position in an opening and closing state of the cover plate, and is clamped with the positioning clamping position in a closing state of the cover plate. According to the technical scheme, the sliding guide of the cover plate is realized through the cover plate covering the sliding rail, the influence of the stress of the cover plate on the locking piece is avoided, the locking effect is ensured, the locking piece is matched with the two locking surfaces to realize the positioning of the cover plate at different positions relative to the base body, the positioning effect is good, the clamping stagnation and the locking failure are avoided, and the treatment process is convenient to carry out.
Description
Technical Field
The application relates to the field of dental orthodontics, in particular to a self-locking bracket with an arch wire groove fully covered.
Background
The self-locking brackets on the market are basically semi-covered, that is to say the width of the middle-far middle of the bracket is wider than that of the cover plate. Due to the design characteristics of the self-locking structure, the width of the bracket in the near-far middle is narrowed, and the tooth torsion control in clinical correction is influenced.
The inventor therefore also proposes an archwire slot full coverage design. For example, chinese patent publication No. CN110478062a discloses a bracket with reliable structure, which comprises a base with an arch wire slot, a net bottom fixed on one side of the base, and a cover plate mounted on the other side of the base, wherein the bottom surface of the cover plate is in mutual contact with the top surface of the base in a sliding fit manner, the top surface of the base is provided with a strip-shaped elastic member, two clamping slots are sequentially arranged on the bottom surface of the cover plate along the sliding direction of the cover plate, a transition ridge protruding towards the direction of the base is arranged between the two clamping slots, a part of the elastic member is a working section, when the cover plate slides, the working section enters a corresponding clamping slot through the transition ridge, and an avoidance slot is further arranged on the top surface of the base to accommodate the deformation part of the working section when the working section is in contact with the transition ridge. According to the technical scheme, the elastic piece is matched with the transition ridge, so that the positioning of a plurality of positions of the cover plate is realized, the stability of the state of the cover plate is ensured, and the stability of the bracket state is ensured.
However, the inventors found that there is room for improvement in the locking manner of the cover plate in the related art.
Disclosure of Invention
In order to solve the technical problems, the application discloses a self-locking bracket with an arch wire groove fully covered, which comprises a net bottom, a base body provided with the arch wire groove and a cover plate arranged on the base body in a sliding manner, wherein one side of the base body, which is opposite to the net bottom, is provided with a sliding rail matched with the cover plate, the cover plate is arranged on the sliding rail, two locking surfaces which are oppositely arranged in the width direction of the sliding rail are arranged on the sliding rail, each locking surface is provided with an elastic locking piece, the part, matched with the locking surface, of the cover plate is a guide surface, the guide surface is provided with an anti-falling clamping position and a positioning clamping position, the locking piece is clamped with the anti-falling clamping position in the opening and closing state of the cover plate, and is clamped with the positioning clamping position in the closing state of the cover plate.
The following provides several alternatives, but not as additional limitations to the above-described overall scheme, and only further additions or preferences, each of which may be individually combined for the above-described overall scheme, or may be combined among multiple alternatives, without technical or logical contradictions.
Optionally, the guide surface includes:
the anti-falling clamping position and the positioning clamping position are sunken relative to the guide surface and used for restraining the locking piece at the corresponding position;
the transition ridge is positioned between the anti-falling clamping position and the positioning clamping position, and is raised relative to the anti-falling clamping position and the positioning clamping position so as to drive the locking piece to enter the anti-falling clamping position or the positioning clamping position.
Optionally, the guide surface further includes an avoidance slope, where the avoidance slope is disposed on a side of the cover plate facing the archwire slot, and is configured to drive the locking element to deform during a process of installing the cover plate so as to avoid a movement path of the cover plate.
Optionally, the avoidance slope is smooth from one end to follow the tip of cover plate is relative the guide surface is smooth uplift, the other end with the guide surface laminating fast is in order to form the anticreep block position.
Optionally, the top surface of slide rail is equipped with the mounting groove, the both ends of mounting groove are opened in the locking surface of corresponding side be provided with the horizontal pole in the mounting groove, just a locking piece that corresponds is connected respectively at the both ends of horizontal pole.
Optionally, the cross bar and the two locking pieces are in an integrated structure, and the cross bar is U-shaped as a whole and is buckled on the sliding rail.
Optionally, each locking surface has a receiving slot in communication with the mounting slot, and the locking member is positioned to accommodate the receiving slot on the respective side.
Alternatively, the spring force of the cross bar and the two locking members drives the two locking members to interact with the guide surface.
Optionally, the cross section of slide rail is the T-shaped groove, the cross section of cover plate is C shape and opening part acceptd the slide rail, the guide surface is located the both sides of the C shape opening of cover plate.
Optionally, the flap conceals all of the archwire slot.
According to the technical scheme disclosed by the application, the sliding guide of the cover plate is realized in a mode that the cover plate is covered by the sliding rail, so that the influence of the stress of the cover plate on the locking piece is avoided, the locking effect is ensured, the locking piece is matched with the two locking surfaces to realize the positioning of the cover plate at different positions relative to the base body, the positioning effect is good, the jamming and locking failure are avoided, and the treatment process is convenient.
Specific advantageous technical effects will be further explained in the detailed description in connection with specific structures or steps.
Drawings
FIGS. 1a and 1b are schematic views illustrating different states of a self-locking bracket according to an embodiment;
FIG. 1c is a schematic view of the internal structure of the self-locking bracket;
FIG. 1d is an enlarged schematic view of the locking element of FIG. 1 c;
FIG. 2a is a schematic diagram of a coverslip;
FIGS. 2b and 2c are schematic views of the locking member and cross bar in different positions of the cover flap from another perspective;
Figure 2d is a schematic perspective cross-sectional view of the coverslip.
Reference numerals in the drawings are described as follows:
1. a net bottom;
2. 21 parts of a basal body, 21 parts of an arch wire groove, 22 parts of a sliding rail, 221 parts of a locking surface, 222 parts of a locking piece, 23 parts of a mounting groove, 231 parts of a cross rod, 24 parts of a containing groove;
3. Cover plate 31, guide surface 311, anti-falling clamping position 312, positioning clamping position 313, transition ridge 314 and avoiding inclined plane.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1a to 2d, the application discloses a self-locking bracket with an arch wire slot 21 fully covered, which comprises a net bottom 1, a base body 2 provided with the arch wire slot 21 and a cover plate 3 slidingly arranged on the base body 2, wherein one side of the base body 2, which is away from the net bottom 1, is provided with a sliding rail 22 matched with the cover plate 3, the cover plate 3 is arranged on the sliding rail 22, the sliding rail 22 is provided with two locking surfaces 221 which are oppositely arranged in the width direction, each locking surface 221 is provided with an elastic locking piece 222, the matched part of the cover plate 3 and the locking surface 221 is a guide surface 31, the guide surface 31 is provided with an anti-falling clamping position 311 and a positioning clamping position 312, and the locking piece 222 is clamped with the anti-falling clamping position 311 in the opening and closing state of the cover plate 3 (refer to fig. 2 c) and is clamped with the positioning clamping position 312 in the closing state of the cover plate 3.
The cover sheet 3, the slide rail 22 and the locking piece 222 constitute a special locking device in the present embodiment, and in comparison with the locking device in the related art, the cover sheet 3 is covered on the slide rail 22 to constitute a sliding pair, which can be configured to guide the movement of the cover sheet 3, but not to limit the separation of the cover sheet 3 from the slide rail 22, and can also be configured to restrain the cover sheet 3 in the slide rail 22 as in the drawings. Functionally, the slide rail 22 performs the function of a catch groove. In one embodiment, the slide rail 22 is a T-shaped slot in cross section, the cover plate 3 is C-shaped in cross section and the opening portion accommodates the slide rail 22, and the guide surface 31 is located on both sides of the C-shaped opening of the cover plate 3. In the solution shown in the figures, the locking element 222 is only used to limit the relative position of the flap 3 with respect to the slide 22 in the direction of sliding itself, so that it is possible to avoid the flap 3 from having a greater influence on the locking element 222 when subjected to the stresses imposed by the archwire or other components. The stability of the locking element 222 during operation has a positive effect on the locking effect of the flap 3, for example the locking element 222 should not be subjected to excessive stress causing deformation or even jamming of the flap 3 etc. In this embodiment, to improve the stability of the locking element 222, two opposite locking surfaces 221 are also provided on the cover 3 to improve the redundancy of locking.
In a specific mating relationship, referring to an embodiment, the guide surface 31 includes:
The anti-falling engaging position 311 and the positioning engaging position 312 are recessed with respect to the guide surface 31 for restraining the locking piece 222 in the corresponding positions;
The transition ridge 313 is located between the anti-falling clamping position 311 and the positioning clamping position 312, and is raised relative to the anti-falling clamping position 311 and the positioning clamping position 312 to drive the locking piece 222 into the anti-falling clamping position 311 or the positioning clamping position 312.
The transition ridge 313 forms a driving threshold between the anti-falling engagement position 311 and the positioning engagement position 312, and only when the cover plate 3 receives a force greater than the driving threshold, the cover plate can overcome the elastic force of the locking piece 222 to switch different states, and meanwhile, smooth transition is needed among the transition ridge 313, the anti-falling engagement position 311 and the positioning engagement position 312 in principle to realize movement of the cover plate 3.
With further reference to an embodiment, the guide surface 31 further includes a relief ramp 314, the relief ramp 314 being disposed on a side of the cover plate 3 facing the archwire slot 21 for driving deformation of the locking member 222 to clear the path of movement of the cover plate 3 during installation of the cover plate 3.
The avoidance slope 314 can drive the locking piece 222 to avoid the cover plate 3 in the process of installing the cover plate 3, so that the installation of the locking piece 222 is realized, and the installation of the self-locking bracket is convenient. Accordingly, the locking member 222 should be prevented from being disengaged from the guide surface 31 after the cover sheet 3 is mounted in place. In one embodiment, the avoidance slope 314 is smoothly raised from one end to the opposite guide surface 31 from the end of the cover plate 3, and the other end is quickly attached to the guide surface 31 to form the anti-disengagement position 311.
The quick engagement of the relief ramp 314 with the guide surface 31 can act as a stop, limiting the maximum travel of the flap 3. When the locking piece 222 is located at the anti-falling clamping position 311, the locking piece 222 can be prevented from moving continuously relative to the guide surface 31, so that the cover plate 3 is prevented from being separated from the base, and unnecessary trouble of operators such as a clinician in the treatment process is avoided.
In the installation of the locking member 222, referring to an embodiment, the top surface of the sliding rail 22 is provided with a mounting groove 23, two ends of the mounting groove 23 are open to locking surfaces 221 on corresponding sides, a cross bar 231 is disposed in the mounting groove 23, and two ends of the cross bar 231 are respectively connected to a corresponding locking member 222.
The mounting slot 23 provides a space for receiving and positioning the locking member 222. In the mounting process, the function of pre-positioning is achieved through the accommodating function of the mounting groove 23, and subsequent assembly operation is facilitated. During the use of the self-locking bracket, the groove wall of the mounting groove 23 can limit the movement of the locking piece 222 relative to the base body 2, so as to ensure the matching effect of the locking piece 222 and the guide surface 31. The cross bar 231 in the mounting groove 23 can act as a balance bar to link different states of the locking pieces 222 at both ends, thereby ensuring stable operation of the locking pieces 222. It will be appreciated that a force system is formed between the cross bar 231 and the locking member 222, and the cross bar 231 and the locking member 222 may be in a split assembly structure, or in an embodiment, the cross bar 231 and the locking member 222 are integrally formed, and are U-shaped as a whole and fastened to the sliding rail 22. The integrated structure has the advantages of better mechanical property and more convenient manufacturing, production and assembly.
The mounting slot 23 may also effect the constraint of the locking member 222 in addition to the constraint of the cross bar 231. In one embodiment, each locking surface 221 has a receiving groove 24 in communication with the mounting groove 23, and the locking member 222 is positioned to correspond to the receiving groove 24 on the corresponding side.
The receiving slot 24 and the locking member 222 have a variety of mating patterns. For example, the receiving groove 24 receives a part of the locking member 222 to limit the stability of the locking member 222 in a stressed state, and for example, the receiving groove is sized such that the locking member 222 is sized such that at least a part of the locking member 222 can retract into the receiving groove when driven by the guide surface 31, thereby improving the feeling of movement of the cover sheet 3 and adjusting the driving force of the cover sheet 3. In addition to the cooperation of the mounting groove 23 and the receiving groove 24, the force system formed by the cross bar 231 and the locking member 222 can also improve the state of the locking member 222, and in reference to an embodiment, the elastic force of the cross bar 231 and the locking members 222 drives the locking members 222 to interact with the guide surface 31. The elastic force of the locking member 222 maintained at the predetermined position may be provided by the elastic force of the locking member 222 itself deformed, or may be provided by the force applied by the two locking members 222 by the cross bar 231. In a practical product, since elastic deformation is necessarily present, when the locking piece 222 receives the driving force of the guide surface 31, both the cross bar 231 and the locking piece 222 deform, but the degree of deformation of both does not necessarily coincide, but from a mechanical point of view, elastic force is generated by the deformation of the cross bar 231 and both the locking pieces 222 themselves.
From the normal use of the self-ligating bracket, reference is made to an embodiment in which the flap 3 conceals all of the archwire slot 21. Specifically, the width of the near-far middle part of the arch wire groove 21 is consistent with the width of the cover plate 3, so that the tooth torsion control performance consistent with the common ligature is ensured, the ligature-free function of the self-ligature bracket is realized, and the tooth torsion control in clinical correction is better realized.
The working process of the self-locking bracket is explained below in combination with a specific structure:
The section of the cover plate 3 is C-shaped, two ends of the opening are opposite, the guide surface 31 is disposed at two ends of the opening, and the avoidance slope 314, the anti-disengagement engagement position 311, the transition ridge 313 and the positioning engagement position 312 on the guide surface 31 are sequentially disposed on the path of the locking member 222 (actually, the locking member 222 is not moved, and the cover plate 3 drives the guide surface 31 to move relative to the locking member 222).
In the assembly process, firstly, the cross rod 231 and the locking piece 222 are integrally placed in the clamping position formed by the mounting groove 23 and the storage groove 24, the cover plate 3 is pushed in along the sliding rail 22, the avoidance inclined surface 314 and the locking piece 222 are mutually extruded, at the moment, the locking piece 222 is forced by the avoidance inclined surface 314 to enter the storage groove 24 so as to avoid the movement path of the cover plate 3, and the cover plate 3 is mounted.
The locking piece 222 enters the anti-falling clamping position 311 after passing through the avoidance inclined surface 314, at this time, the cover plate 3 is in an open state, when the cover plate 3 is subjected to moment back to the archwire slot 21, one side of the avoidance inclined surface 314 is abutted against the locking piece 222, and meanwhile, the gap between the two sides is smaller than the outer diameter of the locking piece 222 in principle, so that the problem that the cover plate 3 is separated from the sliding rail 22 is avoided.
When the cover plate 3 receives a moment towards the archwire slot 21 and the moment is greater than a preset value, the cover plate 3 can drive the locking piece 222 to deform through the transition ridge 313 to release the movement of the locking piece 222 until the locking piece 222 enters the positioning clamping position 312, and accordingly, the movement process of the locking piece 222 is opposite in the opening process of the cover plate 3, and the details are not repeated.
In the process, the opening and closing travel of the cover plate 3 is controlled by utilizing the height change of the anti-falling clamping position 311, the transition ridge 313 and the positioning clamping position 312, so that the self-locking function is realized.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description. When technical features of different embodiments are embodied in the same drawing, the drawing can be regarded as a combination of the embodiments concerned also being disclosed at the same time.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application.
Claims (6)
1. The full-coverage self-locking bracket of the arch wire groove comprises a net bottom, a base body provided with the arch wire groove and a cover plate which is arranged on the base body and can be opened and closed, and is characterized in that one side of the base body, which is opposite to the net bottom, is provided with a sliding rail matched with the cover plate, the cover plate is arranged on the sliding rail, two locking surfaces which are oppositely arranged are arranged in the width direction of the sliding rail, each locking surface is provided with an elastic locking piece, the top surface of the sliding rail is provided with a mounting groove, the two ends of the mounting groove are opened on the locking surfaces on the corresponding sides, a cross rod is arranged in the mounting groove, the two ends of the cross rod are respectively connected with a corresponding locking piece, each locking piece is provided with a containing groove communicated with the mounting groove, and the position of each locking piece is matched with the containing groove on the corresponding side;
The part of the cover plate matched with the locking surface is a guiding surface, and the guiding surface comprises:
The locking piece is clamped with the anti-falling clamping position in the opening and closing state of the cover plate and clamped with the positioning clamping position in the closing state of the cover plate;
the transition ridge is positioned between the anti-falling clamping position and the positioning clamping position, and is raised relative to the anti-falling clamping position and the positioning clamping position so as to drive the locking piece to enter the anti-falling clamping position or the positioning clamping position
The avoidance inclined surface is arranged on one side of the cover plate, facing the arch wire groove, and is used for driving the locking piece to deform in the process of installing the cover plate so as to avoid the movement path of the cover plate.
2. The self-ligating bracket of claim 1 wherein said relief ramp smoothly bulges from one end to said guide surface from an end of said cover plate and the other end is in rapid engagement with said guide surface to form said anti-disengagement detent.
3. The self-ligating bracket of claim 1 wherein the cross bar is integrally formed with the two locking members and is generally U-shaped and is captured by the slide rail.
4. The self-ligating bracket of claim 1, wherein the spring force of the cross bar and the two locking members drives the two locking members to interact with the guide surface.
5. The self-locking bracket of claim 1, wherein the cross section of the slide rail is a T-shaped slot, the cross section of the cover plate is C-shaped and the opening portion accommodates the slide rail, and the guide surface is located at two sides of the C-shaped opening of the cover plate.
6. The self-ligating bracket of claim 1, wherein the flap conceals all of the archwire slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010876521.9A CN111888019B (en) | 2020-08-27 | 2020-08-27 | Self-ligating brackets with full archwire coverage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010876521.9A CN111888019B (en) | 2020-08-27 | 2020-08-27 | Self-ligating brackets with full archwire coverage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111888019A CN111888019A (en) | 2020-11-06 |
| CN111888019B true CN111888019B (en) | 2025-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010876521.9A Active CN111888019B (en) | 2020-08-27 | 2020-08-27 | Self-ligating brackets with full archwire coverage |
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| CN (1) | CN111888019B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112274278A (en) * | 2020-11-09 | 2021-01-29 | 梁甲兴 | Fully synchronous bracket |
| CN113440275A (en) * | 2021-06-28 | 2021-09-28 | 浙江新亚医疗科技股份有限公司 | L-shaped locking plate self-locking bracket reliable to install |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212438912U (en) * | 2020-08-27 | 2021-02-02 | 浙江新亚医疗科技股份有限公司 | Self-ligating bracket with fully covered arch wire groove |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7780443B2 (en) * | 2006-05-04 | 2010-08-24 | World Class Technology Corporation | Self-ligating bracket with rotary cover |
| CN102427775B (en) * | 2009-05-15 | 2014-08-27 | 拓美株式会社 | Dentition correcting device, and method for mounting/demounting dentition correcting cap |
| US8235714B2 (en) * | 2009-08-12 | 2012-08-07 | World Class Technology Corporation | Convertible buccal tube orthodontic bracket |
| US20110081622A1 (en) * | 2009-10-05 | 2011-04-07 | Cameron Mashouf | Self-ligating bracket with universal application |
| CN203089427U (en) * | 2013-02-26 | 2013-07-31 | 王光良 | Self-locking bracket |
| CN103750911B (en) * | 2014-01-23 | 2016-09-28 | 王光良 | A kind of orthodontics locking bracket |
| CN207532459U (en) * | 2017-04-06 | 2018-06-26 | 李伯休 | A kind of core-locking type self-ligating orthodontic bracket |
| CN208659595U (en) * | 2017-07-13 | 2019-03-29 | 杭州富阳华文医疗器械有限公司 | A kind of locking bracket of orthodontic |
| CN107361865A (en) * | 2017-08-15 | 2017-11-21 | 盐城市腾龙医疗器材有限公司 | Correction locking bracket |
| CN110115638B (en) * | 2019-06-06 | 2025-01-21 | 吕涛 | Self-locking bracket with variable groove |
| CN110478062B (en) * | 2019-07-31 | 2021-06-29 | 浙江新亚医疗科技股份有限公司 | Structurally reliable bracket |
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2020
- 2020-08-27 CN CN202010876521.9A patent/CN111888019B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212438912U (en) * | 2020-08-27 | 2021-02-02 | 浙江新亚医疗科技股份有限公司 | Self-ligating bracket with fully covered arch wire groove |
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| CN111888019A (en) | 2020-11-06 |
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