WO2021058911A1

WO2021058911A1 - Orthodontic bracket

Info

Publication number: WO2021058911A1
Application number: PCT/FR2020/051658
Authority: WO
Inventors: Jean-Claude DENERI; Francis Dieras; Philippe CHORON
Original assignee: Deneri Jean Claude; Francis Dieras; Choron Philippe
Priority date: 2019-09-23
Filing date: 2020-09-23
Publication date: 2021-04-01
Also published as: DE202020005825U1; FR3100975B1; FR3100975A1

Abstract

The present invention concerns an orthodontic bracket comprising a main bracket body comprising a passage for receiving and supporting a straightening wire, and a junction face (27) that forms a junction with the surface of a tooth. According to the invention, - this main bracket body comprises an outer surface extending from the junction face (27), the outer surface thus defining, with the junction face (27), the main bracket body, at least part of this outer surface is in the form of a hollow quarter sphere, the top of which is placed in a central part of this main bracket body, - this main bracket body being configured such that there is a hollow hemisphere (31) into which this main bracket body can be inserted, the wall of this hollow hemisphere (31) then being at least partially formed by at least part of the outer surface of the bracket body, the cumulative percentage of empty spaces between the outer surface of the bracket body and the hollow hemisphere (31) being between 1% and 20% of the volume defined by this hollow hemisphere and the junction face (27).

Description

ORTHODONTIC BRACKET

Technical area

The present invention relates to the field of orthodontics. [0002] It relates more particularly to a bracket, or support, orthodontic with a single arch, the original design of which allows the formation of a first bracket body part, common to various brackets, and of a second complementary bracket body part at the first and individualized, as well as a reduction, or even elimination, of the discomfort felt by the patient during his treatment and allowing a precise orientation of the passage to accommodate this arch.

Prior art

[0003] Single-arch orthodontic appliances are widely used by healthcare professionals.

[0004] These orthodontic appliances are used in particular to correct problems of dental malposition.

Typically, such devices include supports, also called brackets, each having a passage of rectangular section to support an arc, or straightening wire, and a junction face for its attachment to the vestibular face of a tooth.

[0006] It is known that an orthodontic archwire tends, naturally, when it is placed in a passage inside a bracket, to return to its initial unconstrained shape by delivering a force to the corresponding tooth by the intermediate bracket.

Controlling this force applied to the tooth then makes it possible to make the required correction to the position of this tooth.

During the treatment of a patient, the orthodontist is therefore required to modify the shape of the arch or change the diameter, or the section, of the arch, the latter increasing to increase the force applied to the badly teeth. positioned.

At the end of the treatment, the section of the arch is still rectangular in order to match the walls delimiting the passage of rectangular section and thus to finalize the positioning of the teeth. [0007] A successful correction requires not only a good positioning of the brackets on the faces of the patient's teeth, a determination of the shape of the orthodontic arch necessary for the desired correction, but also the control of the orientation of the passage of each bracket. Simulation methods are thus known aimed at predicting dental movement for a patient as a function of a specific orthodontic appliance. These simulation methods generally use three-dimensional imaging techniques such as 3D optical cameras and computer computation to individually model the teeth and the roots of the patient's dentition. From a virtual image of the position of the teeth desired at the end of the treatment (target state), it is possible to determine the positioning and orientation of the passage of each bracket, as well as the shape of the orthodontic archwire. required to make the desired correction to the dentition.

By switching from the virtual image of the corrected dentition to that of the patient's present dentition, the position of the brackets on the teeth to be treated is determined as well as the different stages of treatment.

[0009] The brackets are, therefore, individualized supports each having a junction face shaped to match the face of the tooth on which the corresponding bracket is to be assembled. The passage, open at its ends, is defined so that its main axis presents the desired orientation for each badly positioned tooth to be corrected.

[0010] Thus, these brackets are made individually and for a specific orthodontic appliance for a given patient.

Typically, they can be formed from metal, ceramic or even composite material, for example by a machining process using a robotic micro-milling machine, by stereolithography, ...

[0012] The manufacturing time of such an orthodontic appliance is therefore long and the associated cost is high.

[0013] In addition, if a defect that cannot be easily rectified is found on a bracket thus manufactured, the latter is quite simply discarded because it is not reusable for another patient. The financial losses can therefore turn out to be significant.

[0014] Furthermore, it is observed that the brackets of the state of the art have thick fins capable of causing discomfort for the patient during his treatment, or even injuring his oral mucous membranes. Such brackets are, moreover, difficult to clean. They are therefore ideal points for the accumulation of dental plaque.

[0015] In addition, brackets are known carrying a bracket, which constitutes an inconvenience for the patient throughout the duration of his treatment, the latter being integral with a fin.

[0016] There is therefore a pressing need for an orthodontic bracket, the original design of which overcomes the drawbacks of the prior art described above.

Object of the invention

The present invention aims to overcome the drawbacks of the prior art by providing an orthodontic bracket, simple in its design and in its operating mode, ensuring a reduction, or even elimination, of the discomfort felt by the patient during his orthodontic treatment.

An object of the present invention is such an orthodontic bracket with a shorter manufacturing time and significantly less expensive. Another object of the present invention is such an orthodontic bracket in which the change of one part of the bracket body by another functionalized body part is facilitated.

[0020] The present invention also relates to an orthodontic appliance equipped with at least one such bracket for the orthodontic treatment of a patient.

Disclosure of the invention

To this end, the invention relates to an orthodontic bracket for orthodontic treatment, this orthodontic bracket comprising a main bracket body comprising a passage for receiving and supporting a straightening wire, and a junction face with the surface of a tooth.

[0022] According to the invention,

- this main bracket body comprising an outer surface extending from said junction face, said outer surface thus delimiting with said junction face said main bracket body, at least part of this outer surface has a quarter shape of a hollow sphere, the top of which is placed in a central part of this main bracket body,

- this main bracket body being configured so that there is a hollow hemisphere in which this main bracket body is writable, the wall of this hollow hemisphere then being at least partly formed by at least part of the outer surface of the bracket body, the cumulative percentage of empty spaces between the outer surface of the bracket body on the one hand, and said hollow hemisphere on the other hand, being between 1% and 20%, and even better between 1% and 15 %, and even more preferably between 1% and 12%, of the volume delimited by this hollow hemisphere and said junction face.

The outer surface of this bracket body, opposite the surface of the tooth on which it is fixed, thus has a certain continuity, that is to say that this outer surface is less open, and without element structural projecting from the rest of the bracket body. Seen from the outside, the outer surface of this bracket body therefore appears largely closed.

[0025] Such a bracket thus offers markedly improved comfort for the user while being more aesthetic. It also provides significantly improved hygiene since less dental plaque can develop there.

[0027] Such a bracket can be made of metal, ceramic, amorphous metal alloy, composite or even polycarbonate by any method known to those skilled in the art.

[0028] According to one embodiment of this orthodontic bracket, said main bracket body has a circular or oval straight cross section.

Of course, the hemisphere then itself presents such a straight circular or oval cross section.

According to another embodiment of this orthodontic bracket, said main bracket body comprises two body parts, one of these body parts being removable and being configured for its assembly with the other fixed body part, the removal of said removable part giving access to said passage for handling the arc, or straightening wire.

By way of illustration, the fixed bracket body part can be made in one piece, the removable bracket body part coming together, for example by fitting into this fixed body part. Such a bracket is then made in two body parts only.

According to yet another embodiment of this orthodontic bracket, at least the upper and lower ends, also called poles, of this main bracket body have a thickness less than or equal to 2 mm.

Preferably, this thickness is between 1 and 1.5 mm. Unlike state-of-the-art brackets, such a thickness at the poles, but also a change in the curvature of the occlusal pole, promotes a more natural positioning in occlusion, with minimized interference.

[0031] According to yet another embodiment of this orthodontic bracket, said main bracket body has between its central part and its lower end a change in curvature to limit the risk of occlusal interference.

A reduction in the risk of detachment is thus advantageously observed.

According to yet another embodiment of this orthodontic bracket, the upper and lower ends, also called poles, of this main bracket body are fully rounded.

Preferably, the upper and lower ends of this orthodontic bracket are therefore thin and fully rounded so that such a bracket is advantageously devoid of fins.

Such a shape of the poles offers less grip during the occurrence of unwanted shocks on the brackets. Advantageously, the risks of detachment of the brackets are thus substantially minimized.

In addition, since such a bracket has no sharp edge, it is therefore less inconvenient to wear, or even less irritating, for the patient.

According to yet another embodiment of this orthodontic bracket, the central part of this main bracket body is dome-shaped, its upper and lower ends being placed in the extension of this central part.

Such a bracket is therefore easily cleanable for the patient.

[0034] According to yet another embodiment of this orthodontic bracket, the upper and lower ends, also called poles, of this main bracket body have grooves, or grooves, for the engagement of accessory chains or metal ligatures. Preferably, the chains are made of an elastomeric material. Such chains make it possible in a known manner to connect teeth together. They can be used to bring teeth together and close spaces.

[0035] According to yet another embodiment of this orthodontic bracket, this main bracket body is extended by a bracket, the latter possibly being an integral part of a removable body part of the main bracket body.

According to yet another embodiment of this orthodontic bracket, said main bracket body comprises:

- a body comprising a passage for receiving and supporting a straightening wire, the cross section of this passage defining a main axis, this body comprising a first assembly face which is convex,

- a base comprising a junction face with the surface of the tooth, said base comprising a second assembly face, opposite to said junction face, this second assembly face being concave,

one of these assembly faces being at least partially symmetrical, the other of said assembly faces being configured so that the assembly of these first and second assembly faces determines a particular angle of inclination of said main axis by relative to said junction face to give said straightening wire a given torque relative to the surface of this tooth.

[0037] The assembly of the body and the base by the junction of the first and second assembly faces makes it possible to constitute the orthodontic bracket, which is thus in one piece.

The original design of this bracket thus makes it possible to choose, in a particularly simple manner, one of its constituent elements, advantageously the body, as being of fixed geometry, only the base. being personalized according to the treatment of the patient and the tooth on which the bracket is to be mounted.

Thus defining a structural element common to, or shared between, different models of orthodontic appliances, it is therefore possible to mass produce the latter and reduce its manufacturing costs.

Preferably, the entirety of the first and second assembly surfaces is convex or concave.

Advantageously, one of the assembly faces is entirely symmetrical.

Very advantageously, the first assembly face being convex, the body has a volume of material allowing not only the arrangement, in the mass of this body, of an internal passage but also optionally, of means of guidance and assembly allowing separation of this body into two body parts. One of these body parts can therefore be a functionalized body part and, for example, include a bracket.

Preferably, this passage has a rectangular or substantially rectangular section.

Advantageously, this main axis of the passage is perpendicular or substantially perpendicular to the direction along which the arc, or straightening wire, extends in this passage.

[0044] According to a particular embodiment of this orthodontic bracket, it comprises one or more guide elements for guiding said assembly faces towards one another during the assembly of this body and of this base in order to guarantee the particular torque to be imparted to said straightening wire.

Preferably, these assembly faces being intended to be nested, each of these faces comprises one or more recesses and / or elements forming a projection of said corresponding face, which are respectively complementary to one or more elements forming a projection and / or recesses. of the other assembly face to ensure the guiding in position of said faces relative to each other during their assembly.

Even more preferably, said recess or recesses and said protruding element or elements are configured to ensure assembly without play.

Advantageously, this base comprising one or more holes and the assembly face of the body comprising one or more protruding lugs, these holes have a longitudinal dimension greater than that of the lugs to provide a space for receiving an assembly glue. .

This results in a better assembly of the base on the corresponding face of the tooth to be treated.

This orthodontic bracket may further include one or more locking members for locking the assembly faces in position when they are assembled together. For example, said protruding element or elements comprise one or more profiled members for assembly by clipping, the corresponding recess or recesses defining one or more housings for receiving and retaining these profiled members.

[0045] According to another embodiment of this orthodontic bracket, the face opposite the assembly face of the body is rounded so that the longitudinal section of said body has a general elliptical shape. Such a body thus has a large volume while having thin peripheral edges.

When the body is formed from two nested body parts, such a body volume allows easier handling by the practitioner of the removable body part.

In addition, such a body without a sharp edge is easier to brush and therefore to clean.

According to yet another embodiment of this orthodontic bracket, the body comprising at least two body parts, one of these body parts being removable, this bracket also comprises a functionalized body part, which comprises a finger forming a projection from the remainder of the corresponding body part, this functionalized body part being configured to be received by engagement with the other body part of the body to define said body with a jib crane forming a projection.

According to yet another embodiment of this orthodontic bracket, the upper and lower ends, also called poles, of said base are rounded. Purely by way of illustration, this base has a section of generally elliptical or oval shape.

Such a shape of the poles offers less grip during the occurrence of untimely impacts on the brackets. Advantageously, the risks of detachment of the brackets are thus substantially minimized. In addition, since such a bracket has no sharp edge, it is therefore less inconvenient to wear, or even less irritating, for the patient.

According to yet another embodiment of this orthodontic bracket, the junction face of said base has a surface relief such as ridges or other roughness to strengthen its adhesion with the surface of the tooth.

Preferably, this junction face is shaped to match intimately the surface of the tooth on which it is intended to be mounted.

More generally, the present invention also relates to an orthodontic bracket comprising a central part and upper and lower ends, also called poles.

According to the invention, this central part is thicker than its upper and lower ends, the latter being entirely rounded with a thickness less than or equal to 2 mm, and even better between 1 and 1.5 mm, and at least these upper and lower ends with grooves for engaging accessory chains or metal ligatures.

The upper and lower ends of this orthodontic bracket are therefore thin and fully rounded so that such a bracket is advantageously devoid of fins.

Such a shape of the poles offers less grip during the occurrence of untimely impacts on the brackets. Advantageously, the risks of detachment of the brackets are thus substantially minimized.

Very advantageously, the central part of this orthodontic bracket can be dome-shaped, its upper and lower ends being placed in the extension of this central part. Such a bracket is therefore easily cleanable for the patient.

This bracket may also have a change in curvature between its central part and its lower end to limit the risk of occlusal interference.

Preferably, this bracket has a cross section of generally oval, elliptical or substantially elliptical shape.

The present invention also relates to an orthodontic bracket made of an amorphous metal alloy, that is to say of "metallic glass".

Such a bracket has the required mechanical strength and is advantageously obtained by an injection molding process which makes the manufacture of this bracket easy and economical.

Preferably, the central part of this bracket is thicker than its upper and lower ends, the latter being entirely rounded with a thickness less than or equal to 2 mm, and even better between 1 and 1.5 mm, and at least these upper and lower ends having grooves for engaging accessory chains or metal ligatures.

Advantageously, this orthodontic bracket comprises a main bracket body comprising a passage for receiving and support a straightening wire, and a junction face with the surface of a tooth,

The present invention also relates to an orthodontic appliance for orthodontic treatment comprising one or more brackets, as described above.

In known manner, such an orthodontic appliance also comprises a straightening wire, or simple arch. Such an arc advantageously has shape memory.

Brief description of the drawings

Other advantages, aims and particular characteristics of the present invention will emerge from the following description, given for explanatory and in no way limiting, with reference to the accompanying drawings, in which:

Fig. 1

[0057] [Fig. 1] is a perspective view of an orthodontic bracket according to a first embodiment of the present invention, this bracket exhibiting zero torque;

Fig. 2

[0058] [Fig. 2] is a side view of the orthodontic bracket of FIG. 1, this bracket being equipped with a bracket;

Fig. 3

[0059] [Fig. 3] is a rear perspective view of the orthodontic bracket of FIG. 2;

Fig. 4

[0060] [Fig. 4] is a side view of the orthodontic bracket of FIG. 2, its outer surface being inscribed in a hemisphere of elliptical cross section; Fig. 5

[0061] [Fig. 5] is an exploded view of the orthodontic bracket of FIG. 2; Fig. 6

[0062] [Fig. 6] is another view of the orthodontic bracket shown in Fig. 2;

Fig. 7

[0063] [Fig. 7] is a perspective view of an orthodontic bracket according to a second embodiment of the present invention, this bracket exhibiting negative torque; Fig. 8

[0064] [Fig. 8] is an edited view of the orthodontic bracket of Fig. 7; Fig. 9

[0065] [Fig. 9] is a perspective view of an orthodontic bracket according to a third embodiment of the present invention, this bracket exhibiting positive torque;

Fig. 10

[0066] [Fig. 10] is an edited view of the orthodontic bracket of Fig. 9; Description of the embodiments

[0067] The drawings and the description below contain, for the most part, elements of a certain nature. They can therefore not only serve to better understand the present invention, but also contribute to its definition, if necessary.

First, we note that the figures are not to scale.

Figures 1 to 6 schematically illustrate an orthodontic bracket, or support, according to a first embodiment of the present invention, this support having zero torque.

The term "zero torque" is understood here to mean an angle of inclination of the main axis of the passage of a bracket intended to receive and house a straightening wire, which is zero. In other words, when this bracket is fixed on the face of the patient's tooth intended to receive it, the main axis of the passage of this bracket is perpendicular or substantially perpendicular to the surface of this tooth.

This orthodontic bracket 10 consists of a one-piece body comprising a body 11 and a base 12, which are assembled. It is here made of ceramic but could alternatively be formed of metal or of a composite material.

The body 11 has an inner face 13, called the first assembly face, of convex shape and an outer face 14, opposite this inner face, which is completely rounded. Thus, and very advantageously, this body 11 has a transverse section of substantially elliptical shape giving the latter a large body volume. In this body volume are formed a first body part 15 and a second body part 16, the latter being removable so that the bracket may or may not be functionalized depending on the needs of the practitioner. This first body part 15 advantageously has a change in curvature to limit the risks of occlusal interference.

These body parts 15, 16 define when assembled, part of the internal passage 17, passing through, to receive and support a straightening wire (not shown).

The transverse section of this internal passage 17, which is rectangular, defines a main axis 18, here the main axis of this transverse section. The first body part 15, which contains the entire inner face 13 of convex shape, comprises, on its opposite face, and at a first end, a half-dome 19 of elliptical section, which is extended by a plate 20 delimiting its other end.

It also comprises a central reception element 21 forming a projection of this plate 20. This reception element 21 of flared longitudinal shape has a T-shaped section, so as to define between its upper end and the plate 20, rails lateral guide 22 for the introduction and sliding of the second body part 16. This second body part 16 thus has a section in the form of a half-dome of elliptical section and is partly hollow to define at its base, a portion 23 of curved engagement. The latter is configured to engage and slide in the side guide rails 22 to allow assembly of the two body parts. A locking means (not shown) allows these body parts to be locked in position when they are engaged and thus to prevent any untimely disengagement of the body parts 15, 16 from one another.

As shown in Figures 1 and 2, this second removable body part 16 may or may not be functionalized and have for example a bracket 24.

The first assembly surface 13 of the body 11 is entirely symmetrical and has two guide pins 25 forming a projection and intended to cooperate with orifices 26 passing through the base 12 to ensure a clearance-free assembly of the body 11 and the base 12.

The base 12 comprises a junction face 27 with the surface of the tooth on which this bracket is intended to be mounted. This junction face 27 has a surface relief, here ridges 28, to increase the gluing surface of the base and thus ensure improved adhesion of the base 12 to the tooth.

Likewise, the openings 26 have a longitudinal dimension greater than that of the pins 25 so that the body 11 and the base 12 being assembled, free spaces are defined between the ends of pins 25 and the surface of the tooth to receive glue and increase the adhesion of the bracket with the tooth.

This base 12 also comprises a second assembly face 29, opposite to the junction face 27, which is concave. This second assembly face 29 is here configured so that the assembly of the body 11 of the bracket and of this base 12 determined a zero torque for the passage. A groove 30 is disposed between the second assembly face 29 and the junction face 27 extending over the entire periphery of the base 12. This fully rounded groove 30 at the upper and lower ends of the bracket ensures engagement easy to use with accessory chains or metal ligatures.

As illustrated in Figure 4, there is a hollow hemisphere 31 in which this main bracket body 11, 12 is writable, the wall of this hollow hemisphere being partly formed by part of the outer surface of the bracket body .

More specifically, it is observed that only the groove 30, the openings determined by the passage 17, and the hollow associated with the change in curvature of the first body part 15 do not contribute to the wall of the hollow hemisphere 31.

Thus, the cumulative percentage of empty spaces between the outer surface of the main body 11, 12 of the bracket on the one hand, and this hollow hemisphere 31 on the other hand, is here about 8% of the volume delimited by this hollow hemisphere and the junction face 27.

Figures 7 and 8 schematically represent an orthodontic bracket according to a second embodiment of the present invention.

The elements of Figures 7 and 8 bearing the same references as those of Figures 1 to 6, represent the same objects, which will not be described again below.

This orthodontic bracket 40 differs from that shown in Figures 1 to 6 in that it has negative torque.

By way of example, the amplitude of inclinations of the main axis of the passage of this bracket 40 relative to the face of the corresponding tooth is between 0 ^° excluded and -10 ^° .

Such an amplitude of inclinations of the main axis of the passage, or even of negative torques, makes it possible to individualize this orthodontic bracket 40 in order to meet the patient's need for treatment. Figures 9 and 10 schematically represent an orthodontic bracket according to a third embodiment of the present invention. The elements of Figures 9 and 10 bearing the same references as those of Figures 1 to 6, represent the same objects, which will not be described again below.

This orthodontic bracket 50 differs from that shown in Figures 1 to 6 in that it has a positive torque.

For example, the amplitude of inclinations of the main axis of the passage of the bracket 50 relative to the face of the corresponding tooth is between 0 excluded and +10.

Claims

[Claim 1] An orthodontic bracket comprising a main bracket body (11, 12) having a passage (17) for receiving and supporting a straightening wire, and a junction face (27) with the surface of a tooth, characterized by what:

- this main bracket body (11, 12) comprising an outer surface extending from said junction face (27), said outer surface thus delimiting with said junction face (27), said main bracket body (11) , 12), at least part of this outer surface has the shape of a hollow quarter-sphere, the apex of which is placed in a central part of this main bracket body (11, 12),

- this main bracket body (11, 12) being configured so that there is a hollow hemisphere (31) in which this main bracket body is writable, the wall of this hollow hemisphere (31) then being at least partly formed by at least part of the outer surface of the bracket body, the cumulative percentage of empty spaces between the outer surface of the bracket body on the one hand, and said hollow hemisphere (31) on the other hand, being between 1% and 20% of the volume delimited by this hollow hemisphere (31) and said junction face (27).

[Claim 2] A bracket according to claim 1, characterized in that said main bracket body (11, 12) has a circular or oval straight cross section.

[Claim 3] Bracket according to claim 1 or 2, characterized in that said main bracket body (11, 12) comprises two body parts, one of these body parts being removable (16) and being configured for its assembly with the other fixed body part (15, 12), the removal of said removable part (16) giving access to said passage (17).

[Claim 4] Bracket according to one of claims 1 to 3, characterized in that at least the upper and lower ends, also called poles, of this main bracket body (11, 12) have a thickness less than or equal to 2 mm, and even better between 1 and 1.5 mm.

[Claim 5] Bracket according to any one of the preceding claims, characterized in that the main bracket body (11, 12) has between its central part and its lower end a change of curvature to limit the risk of occlusal interference.

[Claim 6] Bracket according to any one of the preceding claims, characterized in that the upper and lower ends, also called poles, of this main bracket body (11, 12) are fully rounded.

[Claim 7] Bracket according to any one of the preceding claims, characterized in that the central part of this main bracket body (11, 12) is dome-shaped, its upper and lower ends being placed in the extension of this central part.

[Claim 8] Bracket according to any one of the preceding claims, characterized in that the upper and lower ends, also called poles, of this main bracket body (11, 12) have grooves (30) for the engagement of accessory chains or metal ligatures.

[Claim 9] Bracket according to any one of the preceding claims, characterized in that this main bracket body is extended by a bracket (24), the latter possibly being an integral part of a removable body part of the main bracket body. .

[Claim 10] Bracket according to any one of the preceding claims, characterized in that said main bracket body comprises:

- a body (11) comprising a passage (17) for receiving and supporting a straightening wire, the cross section of this passage (17) defining a main axis (18), this body (11) comprising a first assembly face (13) which is convex,

- a base (12) comprising a junction face (27) with the surface of the tooth, said base (12) comprising a second assembly face (29), opposite to said junction face (27), this second face assembly (29) being concave,

- one of these assembly faces being at least partially symmetrical, the other of said assembly faces being configured so that the assembly of these assembly faces determines a particular angle of inclination of said main axis (18) by relative to said junction face (27) to impart to said straightening wire a given torque relative to the surface of this tooth.

[Claim 11] Bracket according to claim 10, characterized in that it comprises one or more guide elements (25, 26) for guiding said assembly faces towards one another during assembly of said body ( 11) and said base (12) and thus guarantee the particular torque to be imparted to said straightening wire.

[Claim 12] Bracket according to claim 10 or 11, characterized in that these assembly faces being intended to be nested, each of these faces comprises one or more recesses (26) and / or elements forming a projection (25) of said corresponding face, which are respectively complementary to one or more elements forming a projection and / or recesses of the other assembly face to ensure the guiding in position of said faces relative to each other during their assembly.

[Claim 13] Bracket according to claim 12, characterized in that said recess (s) (26) and said projection member (s) (25) are configured to ensure a clearance-free assembly.

[Claim 14] Bracket according to any one of the preceding claims, characterized in that it is made of an amorphous metal alloy.

[Claim 15] An orthodontic appliance comprising one or more brackets according to any one of claims 1 to 14.