CN113598989A - Orthodontic self-ligating bracket - Google Patents

Orthodontic self-ligating bracket Download PDF

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Publication number
CN113598989A
CN113598989A CN202110960626.7A CN202110960626A CN113598989A CN 113598989 A CN113598989 A CN 113598989A CN 202110960626 A CN202110960626 A CN 202110960626A CN 113598989 A CN113598989 A CN 113598989A
Authority
CN
China
Prior art keywords
guide
cover
bracket
slide
front edge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110960626.7A
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Chinese (zh)
Inventor
张宁
白玉兴
边策
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Stomatological Hospital
Original Assignee
Beijing Stomatological Hospital
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing Stomatological Hospital filed Critical Beijing Stomatological Hospital
Priority to CN202110960626.7A priority Critical patent/CN113598989A/en
Publication of CN113598989A publication Critical patent/CN113598989A/en
Pending legal-status Critical Current

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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
    • A61C7/28—Securing arch wire to bracket
    • A61C7/34—Securing arch wire to bracket using lock pins
    • 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
    • A61C7/08—Mouthpiece-type retainers or positioners, e.g. for both the lower and upper arch

Abstract

The invention provides a self-ligating bracket for orthodontics, comprising: a base; a cover portion; the base portion to bond to a tooth surface, the base portion including a receiving slot to receive an orthodontic archwire, the receiving slot extending and including a bottom wall; the cover portion includes a front edge wall including a middle portion and side edge portions on both sides of the middle portion, the cover portion slidably connecting the base portion to slide between a closed state in which the front edge wall is positioned above the bottom wall and an open state in which the front edge wall is staggered above the bottom wall, wherein, when in the closed state, the side edge portions of the front edge wall correspond to both ends of the bottom wall in the extending direction, and the middle portion of the front edge wall corresponds to a middle portion of the bottom wall. By applying the technical scheme, the self-locking bracket for orthodontics can be provided, the width of the stress point contacted by an orthodontics arch wire when the orthodontics arch wire rotates is enough to achieve the effect of moving, twisting and aligning teeth, and the problem of the width of the stress point is solved without the ligation of an additional ligature wire.

Description

Orthodontic self-ligating bracket
Technical Field
The invention relates to a self-ligating bracket for orthodontics.
Background
The orthodontic bracket is a device made of metal or ceramic and the like and fixed on the surface of a tooth by a special adhesive in orthodontic treatment, is used for accommodating and fixing an orthodontic wire to transmit orthodontic force to the tooth so as to achieve the aim of straightening the tooth, and needs to be periodically re-examined to replace or adjust the diameter specification and the shape of the orthodontic wire in the treatment process so as to achieve the aim of straightening. The support groove that tooth fixed just abnormal use in the market at present has ordinary support groove and self-ligating support groove dual mode, and ordinary support groove then is fixed just abnormal silk and ordinary support groove with the ligature wire on, need tear open the ligature wire rear and can take out just abnormal silk during the double-shot, through on adjustment or change just abnormal silk need the fixed just abnormal support groove of ligature again, still lead to the tooth to remove slow scheduling problem because of the too tight frictional force scheduling problem of ligature sometimes.
The self-ligating bracket can be quickly installed in the bracket after the locking piece is opened by a special tool and the orthodontic wire is adjusted and replaced during the return visit, thereby avoiding the problems of repeated ligation, ligation force and the like. Compared with the common bracket, the self-ligating bracket which is simple and convenient to operate and more safe to wear does not need to be ligatured by a binding wire, so that the problem that the ligature force is not easy to control friction force and the like is avoided, the tooth correcting speed is higher than that of the common bracket, and the chair-side operation time is reduced to prolong the double-diagnosis period and shorten the treatment time.
The self-locking structure used by the existing self-locking bracket is complex, a series of locking fixing structures such as locking buckles with rotating buckles are convenient to use compared with the common bracket, but some special tools need to be used during specific operation, or small parts such as bolts need to be matched with each other to realize the locking structure, the most common self-locking bracket used at present is a sliding buckle type structure, and the width of a locking plate is limited due to the design structure of the locking plate in the middle of the bracket.
The width of a stress point contacted by the orthodontic steel wire during rotation is difficult to reach the width of the movable twisted aligned teeth, and the problem of the width of the stress point is solved by ligaturing the ligature wire by using a common bracket method in order to increase the tooth movement rotation control force during normal use.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a self-ligating bracket for orthodontics.
In order to solve the above technical problems, the present invention provides an orthodontic self-ligating bracket comprising:
a base;
a cover portion;
the base portion to bond to a tooth surface, the base portion including a receiving slot to receive an orthodontic archwire, the receiving slot extending and including a bottom wall;
the cover portion includes a front edge wall including a middle portion and side edge portions on both sides of the middle portion, the cover portion slidably connecting the base portion to slide between a closed state in which the front edge wall is positioned above the bottom wall and an open state in which the front edge wall is staggered above the bottom wall, wherein, when in the closed state, the side edge portions of the front edge wall correspond to both ends of the bottom wall in the extending direction, and the middle portion of the front edge wall corresponds to a middle portion of the bottom wall.
In a preferred embodiment, the sliding mechanism further comprises an elastic guide post, a first end of the elastic guide post is connected to the base, the lid comprises an engaging sliding groove for receiving a second end of the elastic guide post, the elastic guide post is capable of sliding on the engaging sliding groove, the engaging sliding groove comprises a radial-contracting section, and when the lid slides from the open state to the closed state, the engaging sliding groove slides relative to the second end of the elastic guide post so that the second end of the elastic guide post is correspondingly clamped against the radial-contracting section to limit the sliding of the lid.
In a preferred embodiment, the engaging slide groove further includes a receiving hole corresponding to the opened state, and the radial dimension of the reduced diameter section is smaller than the radial dimension of the receiving hole.
In a preferred embodiment, the base portion includes two guide ribs arranged in parallel at intervals and extending, and the lid portion includes two guide slide grooves sliding on the guide ribs, respectively, and the guide slide grooves slide on the guide ribs to slide the lid portion between the open state and the closed state.
In a better embodiment, the two guide raised strips comprise convex parts protruding oppositely, the two guide sliding chutes comprise concave parts recessed oppositely, and the shape of the concave parts is fit and slide on the convex parts; the protrusions and recesses are disposed proximate to the side edges of the leading edge wall.
In a preferred embodiment, the base portion includes two guide ribs arranged in parallel at intervals and extending, and the lid portion includes two guide slide grooves sliding on the guide ribs correspondingly, the guide slide grooves sliding on the guide ribs to slide the lid portion between the open state and the closed state; the first end of the elastic guide pillar is arranged between the two guide convex strips, and the embedded sliding groove is arranged between the two guide sliding grooves.
In a preferred embodiment, the base further comprises an extending slot portion located between the two guiding ribs; the cover portion further includes an extension tab defining a middle portion of the leading edge wall; the extending convex block is positioned between the two guide sliding grooves and correspondingly slides on the extending groove part.
In a more preferred embodiment, the receiving groove has a square cross-section.
In a more preferred embodiment, the elastic guide post is a nitinol hollow tube.
In a preferred embodiment, the base includes a bracket body and an adhesive bottom plate connected to the bracket body, the adhesive bottom plate is used for adhering to the surface of the tooth, the bracket body includes the receiving groove, and the cover slides on the bracket body.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
the orthodontic self-locking bracket comprises a base part and a cover part; the base portion to bond to a tooth surface, the base portion including a receiving slot to receive an orthodontic archwire, the receiving slot extending and including a bottom wall; the cover portion includes a front edge wall including a middle portion and side edge portions on both sides of the middle portion, the cover portion slidably connecting the base portion to slide between a closed state in which the front edge wall is positioned above the bottom wall and an open state in which the front edge wall is staggered above the bottom wall, wherein, when in the closed state, the side edge portions of the front edge wall correspond to both ends of the bottom wall in the extending direction, and the middle portion of the front edge wall corresponds to a middle portion of the bottom wall. The width of a stress point contacted by the orthodontic arch wire during rotation is enough to achieve the effect of moving, twisting and aligning teeth, and the problem of the width of the stress point is solved without the need of extra ligature wires.
The two guide raised strips comprise convex parts protruding back to back, the two guide sliding grooves comprise concave parts recessed back to back, and the shapes of the concave parts are fitted and slide on the convex parts; the protrusions and recesses are disposed proximate to the side edges of the leading edge wall. The cover portion may be more secure when in the closed state to enhance the stability of the side edge portion of the leading edge wall in the closed state, and is less likely to shake.
The base part comprises two guide convex strips which are arranged in parallel at intervals and extend, the cover part comprises two guide sliding grooves which correspondingly slide on the guide convex strips, and the guide sliding grooves slide on the guide convex strips so that the cover part slides between an open state and a closed state; the first end of the elastic guide pillar is arranged between the two guide convex strips, and the embedded sliding groove is arranged between the two guide sliding grooves. The first end of the elastic guide pillar is arranged between the two guide raised lines, so that the stress of the cover part during sliding is reasonable, the embedded sliding groove is arranged between the two guide sliding grooves, and the two guide sliding grooves can provide good guide effect for the sliding between the embedded sliding groove and the elastic guide pillar.
Drawings
FIG. 1 is a perspective view of a self-ligating bracket for orthodontic use with a cover portion in an open position in accordance with a preferred embodiment of the invention;
FIG. 2 is a schematic perspective view of a self-ligating bracket for orthodontic use with a cover portion in a closed position in accordance with a preferred embodiment of the invention;
FIG. 3 is an exploded perspective view of a self-ligating bracket for use in orthodontic treatment in accordance with a preferred embodiment of the invention;
FIG. 4 is a cross-sectional view of a cover portion of an orthodontic self-ligating bracket of a preferred embodiment of the invention shown with the flexible post attached to the reducing section;
FIG. 5 is a schematic perspective view of the base of a self-ligating bracket for use in orthodontics in accordance with a preferred embodiment of the present invention;
FIG. 6 is a perspective view of a cover portion of a self-ligating bracket for use in orthodontics in accordance with a preferred embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below", and other directional terms, will be understood to have their normal meaning and refer to those directions as they normally relate to when viewing the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.
The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
Referring to fig. 1-6, a self-ligating bracket for orthodontic use includes a base portion 1 and a cap portion 2. The base 1 is used for adhering to the tooth surface, the base 1 comprises a bracket body 11 and an adhering bottom plate 12, the adhering bottom plate 12 comprises an adhering surface, the adhering surface is used for being coated with adhering glue and adhering to the tooth surface, the bracket body 11 is connected with the adhering bottom plate 12, in the embodiment, the bracket body 11 and the adhering bottom plate 12 are integrally formed, and in some simple replacements, the bracket body 11 can be directly adhered to the tooth surface.
The bracket body 11 includes a bracket head 111 and a bracket leg 112 extending and connected to the bracket head 111 and the bonding base 12. referring to fig. 4, the bracket leg 112 has a lateral dimension smaller than that of the bracket head 111 to define a side groove 113 between the bracket head 111 and the bonding base 12, and the side groove 113 is used for hanging the elastic ring.
The bracket body 11 further comprises a receiving slot 114 for receiving an orthodontic archwire, wherein the receiving slot 114 extends on the bracket head 111, and in the embodiment, the receiving slot 114 comprises a bottom wall 1141 and two side walls 1142 connected to the bottom wall 1141, and the side walls 1142 are perpendicular to the bottom wall 1141 to make the cross section of the receiving slot 114 square. In actual use, the receiving slots 114 extend in a mesial-distal direction. The bracket head 111 includes a first head 1112 and a second head 1111 disposed on opposite sides of the receiving slot 114.
The cover portion 2 includes a front edge wall 221, the front edge wall 221 includes a middle portion 2212 and side portions 2211 on both sides of the middle portion 2212, the cover portion 2 is slidably connected to the base portion 1 to slide between a closed state in which the front edge wall 221 is positioned above the bottom wall 1141 and an open state in which the front edge wall 221 is staggered above the bottom wall 1141, wherein, when in the closed state, the side portions 2211 of the front edge wall 221 correspond to both ends of the bottom wall 1141 in the extending direction, and the middle portion 2212 of the front edge wall 221 corresponds to a middle portion of the bottom wall 1141. In the present embodiment, the cover portion 2 is slidably disposed on the second head portion 1111, the cover portion 2 includes a cover main body 21 slidably connected to the second head portion 1111 and a cover suspension portion 22 connected to the cover main body 21, a downward side of the cover suspension portion 22 defines the front edge wall 221, and when the front edge wall 221 is located above the bottom wall 1141, the receiving groove 114 and the front edge wall 221 define a through hole for passing an orthodontic archwire therethrough, which is square in the present embodiment. Specifically, the middle portion 2212 and the side portions 2211 of the leading edge wall 221 are arranged at intervals, the side portions 2211 include a first side plane 2213 and a second side plane 2214, the middle portion 2212 is a middle plane 2215, and the first side plane 2213 and the second side plane 2214 are respectively located on two sides of the middle portion 2212 spaced along the extending direction of the receiving groove 114. When the orthodontic arch wire is in a closed state, the first side plane 2213 and the second side plane 2214 respectively correspond to two ends of the bottom wall 1141 along the extending direction, and the orthodontic arch wire is fixed by three planes, namely the middle plane 2215, the first side plane 2213 and the second side plane 2214, so that the width of a force bearing point contacted by the orthodontic arch wire during rotation is enough to achieve the effect of moving, twisting and aligning teeth, and no additional ligature wire is needed for ligaturing to solve the problem of the width of the force bearing point.
The self-ligating bracket for orthodontics further comprises an elastic guide post 3, a first end 31 of the elastic guide post is connected with the base part 1, the cap part 2 comprises a tabling sliding groove 23 for receiving a second end 32 of the elastic guide post, the elastic guide post 3 can slide on the tabling sliding groove 23, the tabling sliding groove 23 comprises a reducing section 231, when the cap part 2 slides from an opening state to a closing state, the tabling sliding groove 23 slides relative to the second end 32 of the elastic guide post so that the second end 32 of the elastic guide post is correspondingly clamped on the reducing section 231 to limit the sliding of the cap part 2. In this embodiment, the second head 1111 includes a fixing hole 1113 for fixedly connecting the first end 31 of the elastic guide pillar, and the first end 31 of the elastic guide pillar is fixed in the fixing hole 1113.
The fitting chute 23 further includes a receiving hole 232 corresponding to the opened state, and the radial dimension of the reduced diameter section 231 is smaller than the radial dimension of the receiving hole 232. One end of the reduced diameter section 231 is connected to the receiving hole 232, and the other end extends in the sliding direction of the cover part 2. Referring to fig. 1, the second end 32 of the elastic guide post corresponds to the receiving hole 232, and the cover hanging portion 22 is completely separated from the upper side of the receiving groove 114. Referring to fig. 2 and 4, the cover 2 is pushed by external force to slide, and the second end 32 of the elastic guide post leaves the receiving hole 232 and is squeezed into the radial section 231, and the cover 2 is forced until the cover suspension 22 is located above the receiving groove 114, and the front edge wall 221 is located above the receiving groove 114, and the cover 2 is in a closed state. In this embodiment, the elastic guide pillar 3 is a structure that can be elastically deformed when being pressed by the reduced diameter section 231, and the elastic guide pillar 3 is a hollow tube of nitinol.
In this embodiment, in the closed state, the cover 2 is abutted with the first header 1112, and one side of the first header 1112 abutted with the cover 2 further includes a slot 1116. When it is desired to open the cover 2, a tool may be inserted into the slot 1116 to push the cover 2.
The base part 1 comprises two guide convex strips 13 which are arranged in parallel at intervals and extend, the cover part 2 comprises two guide sliding grooves 24 which correspondingly slide on the guide convex strips 13, and the guide sliding grooves 24 slide on the guide convex strips 13 to enable the cover part 2 to slide between an opening state and a closing state. In this embodiment, the second head 1111 includes the guiding protruding strip 13, the second head 1111 includes a sliding abutting plane 1114 and a guiding platform 1115 connected to the sliding abutting plane 1114, and two guiding protruding strips 13 are distributed on two sides of the guiding platform 1115; the cap body 21 includes a sliding fit plane 211 slidably abutting against the sliding abutment plane 1114, the cap body 21 further includes a guide receiving space 212 correspondingly formed on the sliding fit plane 211, the guide receiving space 212 is configured to receive the guide platform 1115, and the two guide sliding grooves 24 are distributed on two sides of the guide receiving space 212.
The guide protrusion 13 includes a guide body 131 connected to the guide stage 1115 and a protrusion 132 connected to the guide body 131, the protrusions 132 of the two guide protrusions 13 protrude oppositely, that is, the two protrusions 132 protrude toward two ends of the receiving groove 114 along the extending direction, in this embodiment, the extending direction of the guide protrusion 13 is perpendicular to the extending direction of the receiving groove 114, and the protruding direction of the protrusion 132 is parallel to the extending direction of the receiving groove 114. The two guide runners 24 comprise recessed portions 241 that are recessed away from each other, i.e. the two recessed portions 241 are recessed towards both ends of the receiving slot 114 in the extension direction, in this embodiment, the extension direction of the guide runners 24 is perpendicular to the extension direction of the receiving slot 114, and the recess direction of the recessed portions 241 is parallel to the extension direction of the receiving slot 114. The shape of the concave portion 241 fits and slides on the convex portion 132, which can ensure that the cover main body 21 does not shake left and right when sliding on the first head portion 1112. The convex portion 132 and the concave portion 241 are provided near the side portion 2211 of the leading edge wall 221, and therefore, it is possible to be more secure when the cover portion 2 is in the closed state, to enhance the stability of the side portion 2211 of the leading edge wall 221 in the closed state, and to be less prone to rattle.
In the present embodiment, the first end 31 of the elastic guide post 3 is disposed between the two guide protrusions 13, and the engaging slide groove 23 is disposed between the two guide slide grooves 24. The fixing hole 1113 is opened on the guide platform 1115 and is located between the two guide protrusions 13, and the engaging sliding groove 23 is located on the top wall of the guide accommodating space 212 and is located between the two guide sliding grooves 24.
The base 1 further includes an extending slot 14 between the two guiding ribs 13, and in this embodiment, the two guiding main bodies 131 are spaced apart from each other to define the extending slot 14. The cover portion 2 further includes an extension projection 25, the extension projection 25 defining a middle portion 2212 of the front edge wall 221, the extension projection 25 being disposed on a top wall of the guide receiving space 212, and in the present embodiment, the fitting slide groove 23 being disposed on the extension projection 25. The extending projection 25 is located between the two guiding sliding grooves 24 to make the guiding main body 131 slide correspondingly, the extending projection 25 slides correspondingly on the extending groove 14, and the sliding of the cover 2 is more stable.
The above description is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any person skilled in the art can make insubstantial changes in the technical scope of the present invention within the technical scope of the present invention, and the actions infringe the protection scope of the present invention are included in the present invention.

Claims (10)

1. A self-ligating bracket for orthodontic use, comprising:
a base;
a cover portion;
the base portion to bond to a tooth surface, the base portion including a receiving slot to receive an orthodontic archwire, the receiving slot extending and including a bottom wall;
the cover portion includes a front edge wall including a middle portion and side edge portions on both sides of the middle portion, the cover portion slidably connecting the base portion to slide between a closed state in which the front edge wall is positioned above the bottom wall and an open state in which the front edge wall is staggered above the bottom wall, wherein, when in the closed state, the side edge portions of the front edge wall correspond to both ends of the bottom wall in the extending direction, and the middle portion of the front edge wall corresponds to a middle portion of the bottom wall.
2. The orthodontic self-ligating bracket of claim 1, wherein: the sliding mechanism further comprises an elastic guide column, a first end of the elastic guide column is connected with the base, the cover comprises an embedding sliding groove used for receiving a second end of the elastic guide column, the elastic guide column can slide on the embedding sliding groove, the embedding sliding groove comprises a radial shrinkage section, and when the cover slides from an opening state to a closing state, the embedding sliding groove slides relative to the second end of the elastic guide column so that the second end of the elastic guide column is correspondingly clamped on the radial shrinkage section to limit the sliding of the cover.
3. The orthodontic self-ligating bracket of claim 2, wherein: the fitting chute further includes a receiving hole corresponding to the opened state, and the radial dimension of the reduced diameter section is smaller than the radial dimension of the receiving hole.
4. The orthodontic self-ligating bracket of claim 1, wherein: the base portion comprises two guide protruding strips which are arranged in parallel at intervals and extend, the cover portion comprises two guide sliding grooves which correspondingly slide on the guide protruding strips, and the guide sliding grooves slide on the guide protruding strips to enable the cover portion to slide between an open state and a closed state.
5. The orthodontic self-ligating bracket of claim 4, wherein: the two guide raised strips comprise convex parts protruding back to back, the two guide sliding grooves comprise concave parts recessed back to back, and the shapes of the concave parts are fitted and slide on the convex parts; the protrusions and recesses are disposed proximate to the side edges of the leading edge wall.
6. The orthodontic self-ligating bracket of claim 2, wherein:
the base part comprises two guide convex strips which are arranged in parallel at intervals and extend, the cover part comprises two guide sliding grooves which correspondingly slide on the guide convex strips, and the guide sliding grooves slide on the guide convex strips so that the cover part slides between an open state and a closed state;
the first end of the elastic guide pillar is arranged between the two guide convex strips, and the embedded sliding groove is arranged between the two guide sliding grooves.
7. The self-ligating bracket for orthodontics according to claim 4, 5 or 6, wherein: the base part also comprises an extending groove part positioned between the two guide convex strips;
the cover portion further includes an extension tab defining a middle portion of the leading edge wall;
the extending convex block is positioned between the two guide sliding grooves and correspondingly slides on the extending groove part.
8. The orthodontic self-ligating bracket of claim 1, wherein: the cross section of the receiving groove is square.
9. The orthodontic self-ligating bracket of claim 2, wherein: the elastic guide post is a nickel titanium hollow tube.
10. The orthodontic self-ligating bracket of claim 1, wherein: the base part comprises a bracket body and a bonding bottom plate connected with the bracket body, the bonding bottom plate is used for bonding to the surface of a tooth, the bracket body comprises a receiving groove, and the cover part slides on the bracket body.
CN202110960626.7A 2021-08-20 2021-08-20 Orthodontic self-ligating bracket Pending CN113598989A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110960626.7A CN113598989A (en) 2021-08-20 2021-08-20 Orthodontic self-ligating bracket

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110960626.7A CN113598989A (en) 2021-08-20 2021-08-20 Orthodontic self-ligating bracket

Publications (1)

Publication Number Publication Date
CN113598989A true CN113598989A (en) 2021-11-05

Family

ID=78341462

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110960626.7A Pending CN113598989A (en) 2021-08-20 2021-08-20 Orthodontic self-ligating bracket

Country Status (1)

Country Link
CN (1) CN113598989A (en)

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