DE102004056168B4 - Self-ligating bracket for orthodontics - Google Patents

Abstract

A self-ligating bracket for orthodontics
a base (1),
a pedestal (4) arranged on the base (1),
an occlusal wall (6) emanating from the base (4) with at least one occlusal ligature wing (9),
a gingival wall (5) emanating from the base (4) with at least one gingival ligature wing (8),
a groove (slot 7) separating the occlusal wall (6) and the gingival wall (5) and extending continuously in a mesial to distal direction,
a slit (18) extending in the direction of gingivally occlusally through the pedestal (4) and bounded by a lingually located surface (19) and by a labially located surface (6a),
and a resilient clip (25) having a labial limb (27) and a lingual limb (26) interconnected by an occlusally located portion (28),
wherein the lingual leg (26) in the slot ...

Description

The invention is based on a self-ligating bracket for orthodontics with the features specified in the preamble of claim 1. Such a bracket is from the US 5,906,486 A known. The known bracket has a base whose underside is prepared to be glued to a tooth. On the base a pedestal is arranged whose base is generally smaller than the base. From the pedestal, an occlusal wall and a gingival wall emanate, between which runs a labially open groove which extends continuously in the mesial to distal direction, separating the occlusal wall and the gingival wall. The groove is called in the German jargon as well as in the English language also as "Slot". It serves to accommodate an archwire which usually passes through a series of brackets mounted on a series of adjacent teeth. By pulling and / or twisting, a bias can be generated in the wire which is transmitted from the archwire to the brackets and from these to one or more teeth to change their position.

At the occlusal wall and on the gingival wall of the known bracket In each case one or two ligature wings are provided for the attachment of ligature wires.

Around to secure the position of the archwire in the groove of the bracket has the well-known bracket a resilient clip, which has a labial Thighs and a lingual thigh, which through an occlusal arranged portion are interconnected. This clip is captive mounted on the bracket. For this purpose, that has Bracket a slot that slopes in the occlusal direction gingival extends through the socket throughout and through a broad, lingually located surface, through a broad, labial located surface and by two perpendicular, mesial and distal, narrow surfaces is limited. In this slot is the lingual leg of the clip. The clip can between a closed position, in which the labial thigh into a recess in the gingival wall of the bracket extends, and an open position of the clip moved in which the tip of the labial thigh on the occlusal Wall is resting. In the open position, an archwire can be inserted into the groove or removed from the groove. In the closed position, the labial closes Leg of the clip the groove from labial and lies the archwire resiliently to press this against the bottom of the groove. In the case, that the archwire exerts a force on the labial leg of the clip which the restoring force exceeds the bracket, The recess in the gingival wall is located through a labial Limit stop at which the labial leg of the clip abuts when The arch wire with a sufficiently large force on the labial Thigh acts. The stop in the gingival wall of the bracket further limits the largest possible dimension of the archwire towards lingual-labial.

In the closed position the clamp is held by the labial thigh during Advance in the closed position against the occlusal wall springs and only by elastic bending out its closed position be transferred to the open position can. In its open position, the bracket in the known Bracket be held by the tip of the labial thigh of the Clamp resiliently engages in a depression, which at the labial End of the occlusal wall is provided.

Around to prevent the bracket from getting lost when it comes out of the closed position is transferred to the open position, is on the outside slit lingual thigh pin located an imprint provided that only with elastic deformation through the slot fits through, in which the lingual leg of the clip is inserted. The power needed is to pass through the lingual leg of the clip with its embossed tip To push the slot, when transferring the clip in its open position be well applied, so that there is a risk that the brace is lost and / or the patient chooses to swallow the brace.

Around the clip from its closed position into the open position, is in the known bracket in the labial leg of the clip a hole provided, in which one can intervene with a pin. The Pen can be used as a lever to clamp the clip out of her closed position to move into their open position. This hole has disadvantages. To the one weakens it's the clip. One can not remedy this with an enlargement of the bracket, because at the same time there is a demand that a bracket so small as possible should be. For another through the hole in the clip light food particles in the space between penetrate the clamp and the occlusal wall and through the chewing process even be compacted. Such food particles can be passed through the usual Methods of brushing teeth practically do not eliminate what is harmful to oral hygiene.

Of the present invention has for its object to show a way as the disadvantages described without much effort or reduced can be avoided.

These Task is solved by a bracket having the features specified in claim 1. advantageous Further developments of the invention are the subject of the dependent claims.

The self-ligating bracket according to the invention for orthodontics has
One Base,
a pedestal located on the base,
an occlusal wall emanating from the base with at least one occlusal ligature wing,
a gingival wall emanating from the pedestal with at least one gingival ligature wing,
a groove which separates the occlusal wall and the gingival wall and extends continuously in the mesial to distal direction,
a slit extending in the direction from gingival to occlusal throughout the pedestal and bounded by a lingually located surface and by a labially located surface;
and a resilient clip having a labial thigh and a lingual leg interconnected by an occlusally located portion,
wherein the lingual leg is inserted in the slot and in the gingivalocclusal direction between a closed position, in which the labial leg extends into a recess in the gingival wall, and an open position of the clip is displaceable, in which the tip of the labial leg on the occlusal wall rests.

In each position of the bracket is the lingual bounding the slot located surface over the Top of the lingual leg of the brace in front of and at the gingival End and / or before the gingival end of the lingual thigh Clamp is a positioning aid for a tool provided with which the clamp by pressure against the gingival end of her lingual Leg from the closed position can be moved to the open position.

• – Für das Verschieben der Klammer von ihrer Schließstellung in ihre Offenstellung wird kein Loch im labialen Schenkel der Klammer benötigt. Deswegen ist die Gefahr, dass Speisereste in den Bereich zwischen der Klammer und dem Bracket gedrückt und dort verdichtet werden, wesentlich geringer als im Stand der Technik.
• – Die Mundhygiene wird verbessert.
• – Durch das Fehlen eines Loches im labialen Schenkel der Klammer wird diese im Mund als weniger störend empfunden und sieht ansprechender aus.
• – Obwohl die Lage des gingivalen Endes des lingualen Schenkels der Klammer im Mund nicht oder nur schwer zu sehen ist, kann die Klammer durch Druck gegen das gingivale Ende ihres lingualen Schenkels leicht von der Schließstellung in die Offenstellung verschoben werden, denn durch die vorgesehene Positionierhilfe kann man die Stelle am gingivalen Ende des lingualen Schenkels der Klammer, an welcher man Druck ausüben muß, auch blind ertasten und finden.
• – Die Positionierhilfe, welche am gingivalen Ende oder in der Umgebung des gingivalen Endes des lingualen Schenkels der Klammer vorgesehen ist, schwächt die Klammer und deren Rückstellkraft nicht, im Gegensatz zu dem im Stand der Technik vorgesehenen Loch im labialen Schenkel der Klammer.
• – Der linguale Schenkel der Klammer kann dem auf sein gingivales Ende ausgeübten Druck nicht ausweichen, weil er in dem Schlitz, in dem er steckt, gerade geführt wird. Bei einer Einwirkung auf den labialen Schenkel der Klammer wäre das anders; dort könnte die Klammer beschädigt werden oder das Werkzeug abrutschen und den Patienten verletzen.
• – Für das Verschieben der Klammer in ihre Offenstellung muß kein Spezialwerkzeug angeschafft werden. Geeignete Werkzeuge sind in der kieferorthopädischen Praxis zahlreich vorhanden, zum Beispiel ein Skaler.
• – Die Positionierhilfe vermindert die Gefahr, dass das Werkzeug vom gingivalen Ende des lingualen Schenkels der Klammer abrutscht, während man Druck auf das gingivale Ende ausübt.

This has significant advantages:

• - For the displacement of the clip from its closed position to its open position no hole in the labial leg of the clip is needed. Therefore, the risk of food debris being squeezed into and compressed between the bracket and the bracket is substantially less than in the prior art.
• - The oral hygiene is improved.
• - The absence of a hole in the labial leg of the clip is perceived as less disturbing in the mouth and looks more appealing.
• - Although the position of the gingival end of the lingual leg of the clip in the mouth is difficult or impossible to see, the clip can be easily moved by pressure against the gingival end of her lingual leg from the closed position to the open position, because by the proposed positioning One also palpates and finds the place at the gingival end of the lingual leg of the clamp, where pressure must be exerted.
• The positioning aid, which is provided at the gingival end or in the vicinity of the gingival end of the lingual leg of the clip, does not weaken the clip and its restoring force, in contrast to the prior art hole in the labial leg of the clip.
• - The lingual leg of the clip can not avoid the pressure exerted on its gingival end because it is being guided in the slot in which it is inserted. It would be different if it had an effect on the labial thigh of the clamp. There, the clamp could be damaged or slip off the tool and injure the patient.
• - For moving the clamp in its open position no special tool must be purchased. Suitable tools are numerous in orthodontic practice, for example, a scaler.
• - The positioning aid reduces the risk of the tool slipping off the gingival end of the lingual leg of the clip while putting pressure on the gingival end.

When Positioning aid is a notch in the gingival end of the lingual leg of the brace. The notch does not weaken the restoring force of the clip and is easy to clean. It can be found by the tip of a tool, for example a scaler, on the edge along the pedestal moves the base of the bracket. You then get on automatically the over the tip of the lingual leg of the bracket protruding section the base up to which the lingually located surface of the Schlitzes continues. The tool then hits the end of the lingual thigh the clip and gets automatically with his tip in the Notch and then can exert the pressure which the clamp off their closed position moved to their open position.

Another possibility is to provide a groove extending in the direction of gingival to occlusal as a positioning aid in the portion projecting beyond the clip of the slit-limiting, lingually-located surface. It is also inevitable to enter this groove by passing the tip of the tool along the base of the bracket, along the base of the bracket. Reaching the groove is easy to palpate. If you are in the groove, you can easily reach the gingival end of the lingual thigh in the groove Move the clamp and move it to its open position.

The both ways can also be combined with each other. The two possibilities are the idea underlying, at the point at which the gingival end of the lingual Schenkel of the clamp pressure to be exercised, one with the Tool to provide tactile recess.

Preferably the groove narrows from gingival to occlusal and leads to Middle of the rim at the gingival end of the lingual leg of the clamp. This facilitates finding the groove and centering the tool on the for Moving the bracket optimal place. The groove should be at least to the lingual leg of the clip in its closed position extend. Preferably, it extends even further below the lingual leg of the clamp, leaving the tool over the total displacement of the clip from the closed position can be performed in the open position in the groove. This training recommends especially for the case that at the gingival end of the lingual leg of the brace no notch is provided.

Preferably the groove ends at a stop, which under the lingual leg The clamp is located when these are in their closed position located at a distance from the top of the lingual Leg of the bracket. Preferably, the stop is where in the open position of the clamp, the tip of the lingual thigh the clip is lying. In this way, when reaching the open position the clip automatically stops the movement of the tool because that Tool strikes against the stop. However, the force peak occurring is not in the graceful clip but in the massive bracket. The bracket, on the other hand is spared.

The the slit limiting labial surface is in the gingival area Bracket wall removed or broken. That has the advantage, that it will facilitate the tool, for example a scaler, following the gingival end of the lingual leg of the brace, because the tool when moving the clip are guided along there where the labial surface delimiting the slot is removed or is interrupted.

Preferably is the slit limiting labial surface also in the groove removed or interrupted. That has the further advantage that one from the labial direction also in the area of the groove on the lingual Leg of the clip can act. At the same time, such a diminishes measure the friction between the bottom of the groove and one in the groove Archwire. Furthermore facilitates this measure in particular a further advantageous embodiment of the invention, in which from the lingual leg against the occlusal Wall of the bracket directed tongue cut out in the labial direction bent so that they are at an acute angle with the lingual Includes legs of the clip. Such a tongue secures the clip against being transferred to their open position is lost because the tongue is against the occlusal Wall is directed, beats she's trying to put the clip beyond her open position to move to the occlusal wall and blocked. Only when one presses the tongue back into the clipping of the lingual leg of the clamp and at the same time against the gingival end of this leg of the bracket presses or pulling on the occlusal section of the clip, you can use the clip Completely from the bracket. To depress the tongue leads one tool, for example a pen or a scaler, out labial direction into the groove. When pushing on the clip The bracket does not hinder the tongue, because it is with her the clip-footed end advanced in the slot and automatically into the neck of the lingual thigh Clamp pressed becomes.

The groove preferably extends at least partially in the base of the bracket. This is favorable for achieving a low overall height of the bracket and this in turn is favorable for a high wearing comfort of the bracket in the mouth. The low height is favored by the fact that, as is preferred, the bracket is molded in one piece. In the case of metal brackets, the base is often produced separately in the prior art and only subsequently connected by welding to the base of the bracket. According to the invention, however, it is preferable to form the bracket in one piece, in particular by metal injection molding (MIM), a process related to plastic injection molding for the powder metallurgical production of metallic molded parts. At the same time undercut projections in alternating orientation can be formed on the underside of the base of the bracket, which lead to a significantly better adhesion of the brackets on the tooth when bonding the bracket with a tooth, as conventional brackets, where on the underside of the base of the Brackets a wire mesh is welded. The achievable with undercut projections adhesive strength is about 30% higher than brackets, which have on its underside a wire mesh. Because of the formation of such undercut projections on the underside of the base, reference is made to WO 96/09015 A1. The achievable higher adhesive strengths are particularly advantageous for the present invention, because they reduce the risk that by the closing of the clip from their closing position in the open position force applied and by striking the tool used on the bracket this is replaced by the tooth.

Further Features and advantages of the invention will become apparent from the following Description of a preferred embodiment, which in the attached Drawings is shown.

1 shows a bracket according to the invention in a plan view with a clamp in its closed position,

2 shows the bracket in plan view with the bracket in its open position,

3 shows the cross section AA through the bracket according to 1 .

4 shows the cross section BB through the bracket according to 2 .

5 shows the bracket according to the 1 and 3 in an oblique view of the gingival and labial side of the bracket,

6 shows the bracket from the 2 and 4 in an oblique view of the gingival and labial side of the bracket,

7 shows the bracket 5 in an oblique view of the gingival and lingual side of the bracket,

8th shows the bracket with the bracket in its open position in an oblique view of the gingival and labial side of the bracket, looking from gingival,

9 shows the bracket in a view like in 5 with attached scale and

10 shows the bracket in a view as in 6 with attached scale.

The bracket has a domed base 1 whose curvature approximates the front of a tooth. The base 1 has at its bottom 2 , which forms the lingual side of the bracket, arranged in series projections 3 , which are formed undercut. The projections are in section, as in the 3 and 4 is shown, diamond-shaped, in one to the bottom 2 parallel section, however, formed rectangular. On the bottom 2 An adhesive may be applied to glue the bracket to the front of a tooth. Due to the toothing of the projections 3 good adhesion is achieved with the adhesive. In each row are the projections 3 and with them the undercuts oriented in the same way. From row to row, however, they are alternately oriented in one direction and another in the other direction. As a result, with a thrust acting on the bracket, the same adhesive strength is achieved in the direction from gingival to occlusal as in a shift from occlusal to gingival.

In 1 The orientation provided for the bracket on a tooth is indicated in terms of the directions of the gingival-occlusal and distal-mesial.

The base 1 goes into a socket 4 over, on which a gingival wall 5 and an occlusal wall 6 stand. The two walls 5 and 6 run parallel to each other and are through a groove 7 separated, which runs straight from distal to mesial and is labially open.

At the gingival wall 5 are two ligament wings projecting towards gingival 8th intended. At the occlusal wall 6 are two Ligatur wing wings projecting occlusally 9 intended. Ligation wires may be attached to them in a manner known to those skilled in the art.

The groove 7 serves to receive an archwire 10 , which in particular has a rectangular cross section and is not part of the bracket and therefore in 4 only indicated by dashed lines. By pretensioning the archwire 10 can get to the bottom 11 the groove 7 Pressure and on the walls 5 and 6 the torque is exerted on the bracket. For this purpose, the clear cross section of the groove 7 formed substantially rectangular. He is in the present case by the reason 11 the groove 7 as well as by ribs 12 on the gingival wall 5 and by ribs 13 on the occlusal wall 6 limited, which reduces the friction of the arch wire 10 in the groove 7 serve. The reason 11 in the groove 7 is what is described in more detail below, not over the entire length of the groove 7 at the same level, but interrupted. This also reduces the friction of the archwire 10 in the groove 7 , At the ends of the groove 7 are rounded sloping surfaces 14 at the bottom of the groove, rounded sloping surfaces 15 on the gingival wall 5 and rounded sloping surfaces 16 on the occlusal wall 6 provided, which the entrance of the groove 7 expand and also the friction reduction for in the groove 7 lying archwire 10 serve; This is particularly advantageous for large misalignments of the teeth, which require a particularly irregular course of the arch wire.

In the occlusal wall 6 is a channel extending from distal to mesial 17 provided which can receive an auxiliary element, for example a spring, a check or an auxiliary wire.

Below the ground 11 the groove 7 runs parallel to the ground 11 the groove 7 a slot 18 , which on the lingual side by a plane, to the bottom 11 the groove 7 parallel surface 19 is limited. This surface 19 extends from the occlusal wall 6 across the bracket and initially runs in the socket 4 and finally in the gingival area of the bracket in its base 1 , In the neighborhood of the ligature wings 8th and 9 is the slot 18 through narrow side walls 20 bounded, which are parallel to each other and at right angles to the lingual surface 19 run. Above the slot 18 has the occlusal wall 6 on her tongue 7 side facing away from a cylinder jacket-shaped surface 6a which are in the area of the slot 18 into a lingual surface 19 parallel, even surface 6b passes, which on the labial side of the slot 18 lies. In this way, on the occlusal side of the bracket a funnel-shaped inlet into the slot 18 given. Between the side walls 20 is the reason of the groove 7 except for the lingual surface 19 of the slot 18 lowered.

In the gingival wall 5 is a window 21 provided, which is bordered by the lingual surface 19 through the side walls 20 , through to the side walls 20 subsequent, mutually directed projections 22 between which the gingival wall 5 a break 23 has, by two to the side walls 20 parallel edges 34 and through a labial edge 35 , The lingual edges of the protrusions 22 lie in the flight of the labial surface 6b of the slot 18 in the occlusal wall 6 and serve as the labial surface 6b the guide of the lingual leg of the clamp 25 , The edges 34 and 35 as well as the projections 22 define as components of the window 21 a substantially rectangular section 24 whose length in the direction distal-mesially greater than the distance of the projections 22 but smaller than the distance of the gingival ligature wings 8th , smaller also than the distance of the ribs 12 and 13 , which in the present case with the distance of the side surfaces 20 matches. The at the gingival wall 5 provided ribs 12 ends at the height of the lingual edge of the rectangular section 24 , the same time the labial edge of the projections 22 is.

The brackets include a bracket 25 from a spring material. It has a rectilinear lingual thigh 26 and a comparatively shorter labial thigh 27 , which runs approximately straight. Connected are the two thighs 26 and 27 by an approximately circular arc-shaped, occlusally located section 28 , This is just as wide as the lingual thigh 26 , which with little play in the slot 18 fits. The labial thigh 27 widens approximately to the length of the groove 7 , It does not run parallel, but at an acute angle to the lingual thigh 26 to which it refers, from the occlusal section 28 coming, approaching. The labial thigh 27 has at its gingival end a gingival extension 29 which is angled in the direction of labial. The extension 29 is narrower than the labial thigh 27 and narrower than the lingual thigh 26 ; he fits with little play in the neckline 24 which part of the window 21 in the gingival wall 5 is.

Near the gingival end 26a of the lingual thigh 26 is a tongue out of this 30 cut out and towards the occlusal section 28 at an acute angle to the lingual thigh 26 high.

The clip 25 is connected to the bracket by the lingual thigh 26 coming from the occlusal direction into the slot 18 is introduced. It is characterized by the narrowing inlet of the slot 18 the tongue 30 progressing into the neck of the lingual thigh 26 pressed, from which it is cut out. As soon as the tongue 30 the occlusal wall 6 happened, she springs back and is now against the occlusal wall 6 directed, so that it can not be lost anymore. While advancing the clip 25 into this position meets the extension 29 on the cylinder jacket surface 6a the occlusal wall 6 and slides on this up to their labial top, with the clip 25 is spread against its elastic restoring force. For further advancement of the clip 25 the labial thigh glides 27 the bracket 25 from the labial top of the occlusal wall 6 down and springs into the groove 7 where he is possibly at an archwire 10 can create. By springing back the clamp 25 this is further advanced by moving away from the occlusal wall 6 repels until she with her extension 29 in the neckline 24 intervenes. This secures the archwire 10 in the groove 7 because of the archwire 10 can the labial thigh 27 if necessary, lift the clip until its extension 29 at the labial edge of the neckline 24 strikes. The lingual edges 37 of the cutting 24 are at the same time the labial edges of the projections 22 ; they determine the smallest distance that the labial thigh 27 the bracket 25 from the ground 11 the groove 7 can take. This has the advantage that thinner wire bows, which in the groove 7 lie and not up to the lingual edges 37 range, not under the clamping action of the bracket 25 stand. Such thinner archwires are often used at the beginning of a tooth correction treatment and speed up the correction if they are not pinched. On thicker archwires 10 lies the labial thigh 27 springy on. To reduce the friction between the archwire 10 and the clip 25 are the distal and mesial edges of the labial thigh 27 preferably rounded or with a Beveled.

To the clip 25 from its closed position ( 1 . 3 . 5 . 9 ) into its open position ( 2 . 4 . 6 . 10 ), you take a tool 31 at hand, for example a scaler, and set it, as in the 1 . 3 and 9 shown at the gingival margin of the lingual thigh 26 at. You can feel this place without having to see it because it's the slot 18 on its lingual side limiting surface 19 so far in gingival direction that it extends beyond the gingival end of the lingual thigh 26 the bracket 25 protrudes. It is also located in the lingual surface 19 , starting from their gingival end a groove 32 which extends to below the lingual thighs 26 extends. This groove 32 has an approximately flat formed middle section 32a , which consists of two concave sections 32b flanking the transition from the middle section 32a to the lingual surface 19 produce. The groove 32 narrows in the direction of gingival to occlusal and ends at a stop 33 , The groove 32 serves as a positioning aid for the tool 31 with which the groove 32 can be felt. Do you have the groove 32 palpates, pushes with the tip of the tool 31 the clip 25 in the direction from gingival to occlusal. This will be the tip of the tool 31 continue through the groove 32 guided in the right direction. The sliding movement ends when the tool 31 at the stop 33 strikes. The stop 33 is positioned so that the tongue 30 just before the occlusal wall 6 lies, as in 4 shown when the tool 31 when moving the clamp 25 on the stop 33 meets. The clip 25 is then in its open position. In this open position, the labial thigh has 27 the clamp a resting position on the occlusal wall 6 in which he has access to the groove 7 released from labial direction.

Even if the tool 31 the stop 33 overcomes, the brace can 25 only be pushed so far in the direction of the occlusal, until the tongue 30 on the occlusal wall 6 strikes. It is therefore impossible for the clip 25 when transferring from the closed position ( 3 ) in the open position ( 4 ) get lost. Do you want the clip 25 completely separate the bracket, you have the tongue 30 with a tool back into the recess, from which it is cut out, and while holding the tongue 30 Holds down the clip, you have to 25 push further towards occlusal or pull.

At the gingival margin of the lingual thigh 26 the bracket 25 can a notch in the middle 36 be provided, which is shown only by dashed lines. It can be complementary or instead of the groove 32 serve as a positioning aid.

1

Base

2

Bottom of 1

3

projections

4

base

5

gingival wall

6

occlusal wall

6a

Cylinder-shaped surface

6b

labial surface

7

groove

8th

gingival Ligature wings

9

occlusal Ligature wings

10

archwire

11

Reason of 7

12

Ribs on 5

13

Ribs on 6

14

Inclined surfaces 11

15

Inclined surfaces 5

16

Inclined surfaces 6

17

channel

18

slot

19

lingual surface

20

side walls

21

Window in 5

22

Projections in 5

23

Interruption in 5

24

neckline

25

clip

26

lingual leg

26a

gingival The End

27

labial leg

28

occlusal section of 25

29

Extension of 27

30

tongue

31

Tool

32

groove

32a

middle section of 32

32b

lateral sections of 32

33

attack

34

Edges of 21

35

labially located edge of 21

36

score

37

lingual margins of 21

Claims (18)

A self-ligating bracket for orthodontics has a base ( 1 ), one based ( 1 ) arranged pedestals ( 4 ), one of the pedestal ( 4 ) outgoing occlusal wall ( 6 ) with at least one occlusal ligature wing ( 9 ), one of the pedestal ( 4 ) outgoing gingival wall ( 5 ) with at least one gingival ligature wing ( 8th ), a groove (slot 7 ), which the occlusal wall ( 6 ) and the gingival wall ( 5 ) separates and continuously in the direction from mesial to distal he stretches a slot ( 18 ), which extends in the direction from gingival to occlusally through the pedestal ( 4 ) and through a lingually located surface ( 19 ) and through a labial surface ( 6a ) and a spring clip ( 25 ), which have a labial thigh ( 27 ) and a lingual leg ( 26 ), which through an occlusally arranged section ( 28 ), whereby the lingual leg ( 26 ) in the slot ( 18 ) and in the direction gingival-occlusal between a closed position in which the labial limb ( 27 ) to a section ( 24 ) in the gingival wall ( 5 ) and an open position of the bracket ( 25 ) is displaceable, in which the tip of the labial leg ( 27 ) on the occlusal wall ( 6 ), characterized in that in each position of the bracket ( 25 ) the slot ( 18 ) limiting, lingually located surface ( 19 ) over the tip of the lingual thigh ( 26 ) of the bracket ( 25 ) and that at the gingival end and / or before the gingival end of the lingual thigh ( 26 ) of the bracket ( 25 ) a positioning aid ( 32 . 36 ) for a tool ( 31 ) is provided, with which the clip ( 25 ) by pressure against the gingival end of her lingual thigh ( 26 ) can be moved from the closed position to the open position. Bracket according to claim 1, characterized in that as a positioning aid a notch ( 36 ) in the gingival end of the lingual thigh ( 26 ) of the bracket ( 25 ) is provided. Bracket according to claim 1 or 2, characterized in that as a positioning aid in the projecting portion of the slot ( 18 ) limiting, lingually located surface ( 19 ) a groove extending in the direction from gingival to occlusally ( 32 ) is provided. Bracket according to claim 3, characterized in that the groove ( 32 ) to below the lingual thighs ( 26 ) of the bracket ( 25 ) extends in its closed position. Bracket according to claim 3 or 4, characterized in that the groove ( 32 ) narrowed from gingival to occlusal. Bracket according to one of claims 3 to 5, characterized in that the groove ( 32 ) at least partially in the base ( 1 ) runs. Bracket according to one of the preceding claims, characterized characterized in that it is molded in one piece. Bracket according to one of claims 3 to 7, characterized in that the groove ( 32 ) at a stop ( 33 ), which under the lingual leg ( 26 ) of the bracket ( 25 ), when it is in its closed position, at a distance from the tip of the lingual leg ( 26 ) of the bracket ( 25 ). Bracket according to claim 8, characterized in that the stop ( 33 ) is approximately where in the open position of the bracket ( 25 ) the tip of the lingual thigh ( 26 ) of the bracket ( 25 ) lies. Bracket according to one of the preceding claims, characterized in that the slot ( 18 ) limiting labial surface ( 19 ) in the area of the gingival wall ( 5 ) is removed or interrupted. Bracket according to claim 10, characterized in that the slot ( 18 ) limiting labial surface ( 19 ) also in the area of the groove ( 7 ) is removed or interrupted. Bracket according to one of the preceding claims, characterized in that from the lingual leg ( 26 ) one against the occlusal wall ( 6 ) directed tongue ( 30 ) and is bent in the labial direction so that it makes an acute angle with the lingual leg ( 2fi ) of the bracket ( 25 ). Bracket according to claim 8 and 11, characterized in that the stop ( 33 ) in the position of the bracket ( 25 ), in which the tongue ( 30 ) on the occlusal wall ( 6 ), even under the lingual leg ( 26 ) of the bracket ( 25 ) lies. Bracket according to claim 12 or 13, characterized in that the tongue ( 30 ) in the open position of the bracket ( 25 ) to the occlusal wall ( 6 ) strikes. Bracket according to one of the preceding claims, characterized in that the labial limb ( 27 ) of the bracket ( 25 ) has at its distal edge and at its mesial edge an oblique surface and / or a rounding. Bracket according to one of the preceding claims, characterized in that the groove ( 7 ) at its distal end and at its mesial end respectively oblique surfaces ( 14 . 15 . 16 ) and / or curves. Bracket according to one of the preceding claims, characterized in that in the groove ( 7 ) on the gingival wall ( 5 ) and on the occlusal wall ( 6 ) two ribs each ( 12 . 13 ) are provided, which extend in the direction occlusal gingival and preferably chamfered or gerun have edges. Bracket according to claim 12, 13 or 14, characterized in that the angle between the lingual leg ( 26 ) of the bracket ( 25 ) and the tongue ( 30 ) is between 15 ° and 25 °.