FR2525469A1 - Dental orthopaedic instrument - has elastic wire with loop fitting in tooth attachment parallel to major axis - Google Patents

Abstract

The dental orthopaedic instrument has a mesial portion with hook inserted in a fixing device secured to the canine tooth to be retracted. A distal portion is secured to a molar, so that a force is transmitted to the canine tooth resulting from the elastic distortion of the instrument when in place. A wire (10) with a high degree of elasticity and whose mesial portion (14) forms a loop (15) for insertion parallel to the major axis of the tooth in the direction of the gums and through an attachment (16) fixed to the tooth. The wire ends in a retaining hook (17), and contains a 360 deg. second loop (18), joining its mesial and distal (16) portions. The part of the mesial portion (14a) between the loops is inclined in its free state towards the distal and gum compared to its working position. A component (21) exerts an elastic distal traction force on the mesial portion, and is hooked between the distal end of the instrument and the first loop (15).

Description

Improvements to orthopedic appliances
dentofacial.

The present invention relates to perfection
dentofacial orthopedic appliances of the type
having at least a latch portion for
to be introduced in a solidarity fastening device
of a tooth whose position is to be corrected, so as to
transmit this tooth a force resulting from the die
elastic training of the apparatus when it is
in place.

In the whole of the application, the terms
are used as indication of position or
direction: "distal" meaning on the side or towards
backward following the arch envelope of the upper teeth
or lower, "mesial" which is opposite to distal, "flax
gual "which means on the side or in the direction of the language,
"vestibular" which is opposed to lingual (hence on the side of the cheeks and lips), "gingival" which means on the side
of the gum or 1, occlusal "which is opposed to
gingival.

Several devices of the type defined above
are known but have certain disadvantages.

Thus, there are devices known as "stage fright"
pericraneal (CPP) or "extra-oral forces"
(FEo) intended to distort molars or to prevent them
dear to mesialize. These devices known to PE0.

usually have an intraoral arch whose ex
ends are attached to two molars and that is solidai
an extra-arch, or fork at the ends of
which is fixed an elastic band destined to s'ap
bend to the skull quarry. In order to exercise a
asymmetric action on the two molars to which
the intrabuccal arch is connected, it has been proposed to
an asymmetrical extraoral arch, for example with
a longer branch on the side of the distal molar.

However, it turns out that these arrangements have at best unilateral unilateral bilateral action but can not have an exclusively unilateral action which may be desirable in some cases.

 Also known intraoral devices resting on an anchoring molar to exert an action on a tooth by housing their latch portion in a fixed fastener on the tooth. These known devices often provide satisfactory results but their manufacture and implementation are long and delicate.

 The present invention aims to overcome the disadvantages of known devices, including providing a prefabricated equipment for simple implementation, hence the ability to produce devices with consistent characteristics, and an appreciable time saver for the practitioner.

 According to a first aspect of the invention, it relates to an apparatus with extra-oral forces in which, according to the invention, the intraoral part is limited to a branch whose end is intended to be connected to the molar on which an action is necessary and the extra-lateral fork has one branch which is shorter than the other and which is situated on the side of the intraoral branch., the assembly formed by the extraoral fork and the intraoral branch being relatively rigid. In this way, an exclusively lateral action is exerted.

 Preferably, the shorter branch of the extraoral fork is directed outwards so as not to come into contact with the te te while the other branch of the extraoral fork is of sufficient length to rest on the head on the side opposite to that of the intraoral fork at least to the level of the ear. The set of two forks must be quite rigid. Advantageously, the stability of the apparatus can be increased by providing a second band which is connected to the elastic band intended to be applied to the back of the skull, and which forms a stay for resting on the seat. top of the skull to prevent the device from descending.

According to another aspect of the invention, the subject of the invention is a retractor apparatus, in particular for a canine, having a distal portion connected to an anchoring molar and a mesial part attached to the canine to retract, an apparatus comprising, according to 'invention
a high-elasticity wire whose mesial part forms a loop that can be inserted parallel to the major axis of the tooth and in the gingival direction in a fastener fixed thereto and ends with a retaining hook, said wire forming a loop 3600 connecting its mesial portion to its distal portion just behind the handle and the portion of the mesial portion extending distally from the handle to the loop being, in the free state, inclined distally and gingivally in relation to his working position,
and an element exerting an elastic force of distal traction on the mesial branch being preferably hooked between the distal end of the apparatus and the loop.

So when the device is in place, on the one hand,
the presence of the loop and the tendency of the mesia part
the to find the inclined position which it occupies with the state li
make a force exerted on the tooth tending more
to distort its apex while, on the other hand, the
Elastically acts rather on the crown, so that
the tooth remains straight during the retraction.

Preferably, the mesial part is inclined
about 450 both distally and gingivally by
relative to the distal part.

According to a particularity of the retractor, the
distal part and the mesial part present each
in the free state a so-called first-order curvature
in a plane perpendicular to the major axes of the teeth.

The curvature of the distal part makes it possible to bring the handle
in a correct linguo-vestibular position while
that the curvature of the part mesial allows to exert, if
it is desired, a force tending to rotate the tooth
around its major axis in the desired direction.

 According to yet another of its aspects, the subject of the invention is a rectifier device having a distal portion connected to an anchoring molar and a mesial part hooked to a tooth to straighten it mesially or distally, or to oppose at its mesial or distal inclination, for example to oppose the setting mesio-version "of a second premolar on the crown of which rests an anchor molar.

According to the invention, the straightening apparatus comprises a high elasticity wire whose mesial part forms a loop that can be introduced parallel to the major axis of the tooth and in the gingival direction in a fastener fixed thereto and ends with a retaining hook, the loop making in the free state, an angle different from 900 with the distal portion of the wire to which it is connected. When the device is in place, the loop then exerts on the tooth a force tending to rotate it mesially or distally.

 In the case of a rectifying apparatus intended to oppose the mesio-version of a tooth, the angle made by the handle with the distal portion is greater than 90, for example about 1100.

 According to a particularity of the rectifying apparatus, as in the case of the retractor apparatus, its mesial portion has in the free state a first-order curvature for exerting a force tending to rotate the tooth about its major axis in the meaning eventually desires.

 According to yet another of its aspects, the subject of the invention is an apparatus for correcting the incisors (or incisal bow), an apparatus comprising, according to the invention, a high elasticity wire forming four handles which are intended to penetrate each in parallel. at the long axis of the tooth and in the gingival direction, in a fastener attached to a respective incisor and forming retaining hooks on each side of each incisor, the next wire, in the free state, the ideal shape of the arch in the incisive region (incisive vestibular curvature).

 According to a feature of the retractor device, rectifier or corrector, it further comprises a vestibular arc, or arc-carrier constituted by a wire fixed at the ends to the anchoring molars of the same arch. On the bow carrier the hook (s) of the corrector device of the incisors and, if desired, of the retractor or rectifier apparatus may be engaged.

 As a variant, in the case of the correction device for the incisors, the hooking on the carrier bow may be carried out at the ends of the apparatus and between the adjacent loops by winding the wire of the apparatus around rainbow wearer.

 According to another feature of the apparatus according to the invention they can be completed, as regards the lower arch by a sub-lingual support fixed at the ends to the anchoring molars and comprising a sheet of plastic material intended to be applied. on the floor of the mouth and having a soft and non-offensive edge. Such sub-lingual support makes it possible to oppose a tilting movement, in particular a mesio-version of the molars used for anchoring one or more appliances.

 The different devices defined above are remarkable for their simplicity of structure and implementation. Another advantage lies in the possibility of prefabrication craft and / or industrial devices, resulting in obtaining consistent predetermined characteristics and time saving for the practitioner.

Other particularities and advantages will emerge on reading the description given below, as an indication but without limitation, with reference to the accompanying drawings in which
FIG. 1 is a view in the free state of an FEO type device (extra-oral forces) according to the invention,
FIG. 2 is a schematic view from above illustrating the apparatus of FIG. 1 in working position,
FIG. 3 is a schematic view of an upper arch provided with a canine retractor according to the invention,
FIG. 4 is a side view of an element of the canine retractor of FIG. 3,
FIG. 5 is a top view of the element of the canine retractor illustrated in FIG. 4;
FIG. 6 is a schematic view of an upper arch provided with a second premolar rectifier according to the invention,
FIG. 7 is a schematic view of an upper arch provided with an incisor corrector according to the invention,
FIG. 8 is a schematic view of an embodiment variant of an incisor corrector according to the invention, and
FIG. 9 is a view of an under lingual support according to the invention.

Figures 1 and 2 show a device for
FEO (extra-oral forces) intended to act on a molar
M to distort it or prevent it from mesializing. The molar M is provided with a ring 1 on which is welded a vestibular tube 2 of relatively large inner diameter, for example 1.2 mm. The FEO device comprises an intraoral branch 3 whose end 3a enters the tube 2. The penetration of the branch 3 into this tube is limited by coming into abutment on the mesial end of the tube of a bend 3c formed in the branch 3. The intraoral branch 3 is bent at its end 3b, opposite to 3a between the branches 5 and 6 of an extra-lateral fork.The branch 5, on the side of the molar M, is shorter than the other branch 6 , is directed outwards and ends about 5 cm from the center line, so as not to come into contact with the head. The extralibular branch 6 is adjusted so as to press against the side of the head opposite to the molar M, at least to the tip, and preferably to 2 to 4 cm behind this ear, while passing just above it and leaning slightly on the teguments.The branches 5 and 6 terminate with hooks 5a and 6a with anterior concavity where are fixed the ends of an elastic band 7, which when it is in place at the back of the skull (FIG 2) exerts an elastic tensile force of a few hundred grams, for example about 400 g between the ends of the extraoral fork. The set of branches 3, 5 and 6 must be rigid enough not to be deformed significantly.

 Referring to Figure 2, it is understood that by changing the length of the short extra branch 5, the effect on the molar M can be modified. Indeed, for a given length of the branch 5, the applied force at the molar M may be substantially distal.

If the length is smaller, the force applied to the molar will tend to slightly bend it. On the contrary, if the length is greater, the force applied to the molar will tend to lingualize slightly.

 A second strip 8 has its ends fixed on the strip 7 so as to be applied to the crown of the cranium when the strip is correctly in place. The band 8 then forms a stay to prevent the band 7 from going down to the level of the ears and, a fortiori, below the ears.

 Referring now to Figures 3 to 5 which illustrate a canine retractor according to the invention.

The retractor comprises an element 10 consisting of a high elasticity stainless wire. The distal portion 1I of the wire 10 is introduced by an end end 11a into a buccal anchoring tube 12 welded to a ring 13 surrounding the crown of the anchoring molar M on the side of the canine C to retract. The mesial portion 14 of the wire 10 forms a latch or handle 15 extended by a retaining hook 17. The shackle 15 is made by a permanent deformation of the wire 10 and has a U-shape with closely spaced wings which extends substantially parallel to the long axis of the canine C when the retractor is in pla.ce -cee 15 enters the parallelpidic or cylindrical light 16a of a bead-shaped vestibular clip 16 also known under the name "bracket" which can be welded on a ring sealed on the crown of the canine or directly glued on the vestibular side of the canine to retract, as in the example shown. The light 16a open at both ends extends "vertically", that is to say parallel to the long axis of the canine C and the handle 15 is inserted in the vertical direction of the occlusal edge of the fastener towards its gingival margin. The hook 17 is also formed by permanent deformation of the wire 10, the latter being, at its distal end portion, bent at right angles successively in the gingival and lingual direction. Between its parts 11 and 14, the wire 10 forms a loop 18 of 3600 such that the distal portion passes vestibularly with respect to the mesial portion
14. As can be seen in FIG. 4, the portion 14a of the mesial portion 14 extending between the loop 15 and the loop 18 is, in the free state, inclined distally and gingival with respect to its position of 3), that is to say makes an acute angle (for example about 450) with the distal edge 15a of the handle 15. Finally, Figure 5 shows that the wire 10 has two curvatures of the first order, the one 19 that the part 11 forms a few mm (for example at most 6 mm) in the mesial direction from the mesial edge of the vestibular tube 12, the other 20 that forms the mesial portion substantially at the level of connection of the handle 15 with the portion 14a of the part 14. By "curvature of the first order" is meant here, as is conventional, a curvature located in a plane perpendicular to the major axes of the teeth, that is to say say a horizontal plane when the arch is in a horizontal position. The curvatures 19 and 20 are determined during the prefabrication of the retractor so that the wire 10 has, in top view, a general shape substantially corresponding to the ideal arch (Figure 5).

 The retractor further comprises an element 2-1, for example an elastic ring, intended to exert a distal tensile elastic force on the part 14.

 Finally, the retaining hook clings to a vestibular arch 22 (FIG 3) consisting of a stainless wire whose ends penetrate into vestibular tubes anchor welded to rings 13 and 23 which are provided with the molars of anchoring M and M 'located respectively on one side and the other of the arcade. Alternatively, especially if the vestibular arc is not necessary in a given case, the hooking of the retaining hook 17 could be made on the gingival margin of the fastener 16 by conferring on the latter and / or the hook an appropriate form.

 The canine retractor described above is placed by threading and first immobilizing the distal portion 11 of the wire 10 in the anchoring tube 12, then vertically introducing the handle 15 into the lumen of the fastener 16 and then hook 17 on the vestibular arch 22. The elastic ring 21 is stretched between the distal edge of the tubes 12 or 13 and 23, where it is retained by the ends of the wires 10 and 22 which protrude distally from them. tubes, and the loop 18 (see Figure 3). Advantageously, the elastic ring is curved with a half-turn in the shape of 8, with a flattened path on the outer face of the distal portion 11, thus protecting both the gingiva and the cheek of this portion 11.

 The angle made by the handle 15 with the portion 14a of the portion 14 being about 450, it results, in combination with the presence of the loop 18, the exercise on the canine of a force tending to distort its apex.

For its part, the elastic 21 exerts a tensile force (for example about 200 g) tending to distort the crown of the canine. The combined effects of the wire 10 and the elastic 21 thus lead to a retraction of the canine while maintaining it or making it upright. The curvature 19 has the effect of bringing the handle 15 into its exact lingual-buccal position; without the existence of this curvature, the retractor would tend to vestibulate the canine. As for the curvature 20, it has the effect of keeping the canine a correct orientation around its major axis. It should be noted in this regard that this curvature 20 allows a correction, in one direction or the other, of the canine rotation, since it will be rotated as long as there is a constraint due to a change in the curvature 20 in working position relative to the rest position.

 It is conceivable that, by reaction, a resultant tending to mesialize is exerted on the anchoring molar M.

This action can be favorable in certain cases, for example in case of low incisivo-canine congestion.

In the case where it is not favorable, it can be opposed by means of a transpalatal arc or a palatal bow of Nance. These are devices known in themselves that are not part of the invention and that it is not necessary to describe here. It would also be possible to use extra-oral force devices with bilateral or unilateral action, such as the device described above with reference to FIGS. 1 and 2.

 Referring now to Figure 6 which illustrates, in the working position, a rectifying device of second premolar for example. Insofar as, after extrac tion of the first premolars, the anchoring molars are left or are mesialized, the second premolars have their crown mesially biased by that of the first molars while nothing solicits their apex. As a result, these teeth tend to become mesio-version "(position also known as" tipforward "). We can oppose it by means of the apparatus illustrated in FIG. 6. The identical elements of the figures 3 and 6 have the same references.

 This apparatus essentially comprises a high elasticity stainless wire having a distal portion 31 whose curved end 31a is threaded into the buccal tube 12 on the ring 13.

On the mesial side, the wire 30 forms a loop 35 threaded vertically into the lumen of a fastener 36 from the occlusal edge to the gingival margin thereof and a retaining hook 37 hooked onto the vestibular arch 22. The clip 36 is welded to a sealed ring. on the premolar PM to straighten or, as illustrated, directly glued on the vestibular side thereof. The handle 35 is about 2 mm longer than the handle 15 of the apparatus shown in FIG. 1 and extends beyond the gingival side of the fastener 36 until it is applied behind the vesicle arch 22.

In the rest position (not shown), the distal edge of the loop 35 makes with the portion 34 of the wire 30 which connects to it a larger angle (for example 1100) than the angle (about 900) existing in position. of work (Figure 6).

 The straightening apparatus is set up by inserting the end 31a back into the vestibular tube 32, then pulling the bail 35 into the clip 36 and hooking the catch hook 37 to the bow. Vestibular 22. The fact that the loop 35 is based on its gingival end behind the bow 22, instead that it rests on the crown close to the neck, automatically ensures a more lingual position of the second premolar. In the working position, the loop 35 exerts on the premolar PM a force tending to mesialer its apex because of the tendency of the loop 35 to find its rest position (for example 110C), with respect to the part 34 of the 30. In addition, as for the retractor of Figure 5, a first-order bending may be provided at the connection of the loop 35 and the portion 34 to correct the rotation of the premolar around its major axis where appropriate.

 Referring now to Figure 7 which illustrates a correction device according to the invention to obtain automatically in a large number of cases correction of various incisor malpositions including first-order (rotations on the dental axes and / or dental overlaps ) or second-order (buccal or lingual inclination). The identical elements of FIGS. 3 and 7 have even references.

 The corrector apparatus consists essentially of a high elasticity metal wire 40 forming four handles 41, 42, 43, 44 and five hooks 45, 46, 47, 48 and 49. Each handle penetrates vertically into the light of a vestibular fixation fixed on an incisor. The four fasteners 51, 52, 53 and 54 are similar to those 16 and 36 described above. At each end, the wire 40 ends with a retaining hook, respectively 45, 49. To form each of these hooks 45, 49 each distal end of the handles 41, 44 of the lateral incisors extends distally about 3 mm, then gingivally to the level of the vestibular arc 22 and terminates after a right angle by a horizontal inter-dental lanceolate 45a, 49a hooked on the arc 22. The hooks 45, 49 are similar to the hooks 17, 37 described above. On the other hand, the hooks 46, 47 and 48 are formed by intermediate loops each located between two adjacent loops introduced into the fasteners 50 to 53. Each handle 46, 47 -48 extends gingivally over a distance of about 4.5 mm and has its end bent lingually to catch on the bow 22.

 For the establishment of the correcting device, the loops 41 to 44 are introduced vertically into their respective fasteners, from the occlusal edge to the gingival margin, then the hooks 45 to 49 are put in place.

Note the great simplicity of implementation of the device. The thread 40 is given, in plan view, a general shape corresponding to the vestibular envelope of an ideal incisal arc. As a result, each malposition of an incisor will cause when the device is placed, the exercise on the incisor of an adequate corrective force.

 The apparatus illustrated in Figure 7 is for an upper arch. It will be noted that the handles 42, 43 associated with the central incisors do not extend beyond the gingival margin of the fasteners 52, 53. On the other hand, the handles 41, 44 are longer and extend more than gingivally from the fasteners 51, 54 over a distance of about 2 mm in the same manner and for the same reasons as for the rectifying apparatus illustrated in FIG. 6. This difference in length of the loops 51, 54 with respect to the loops 52, 53 has the effect of lingualizing, with respect to the Bow 22, the lateral incisors more than the central incisors, as it is a constant anatomical and physiological wish to the upper arch.

 In the case of the lower arch, the correction device of the incisors is simpler in the sense that all the handles have the same height without exceeding the gingival side of the fasteners. It should also be noted that, for the lower arch, the spacings between the loops are narrower than for the upper arch because the lower incisors are smaller than the upper ones.

 For each arch, we can predict the pre-manufacture of two models of incisor correctors, one larger, for large teeth or to overcompensate a size of small teeth and the other, smaller, for small teeth or to overcorrect by mesialization of the teeth too small. It is also possible to provide only one model per arcade which will be retouched for the needs of the case to be treated.

 An alternative embodiment of an incisor corrector device is shown in FIG. 8. This apparatus differs from that of FIG. 7 in that the hooking on the arc 22 is achieved not by means of hooks 45 to 49. but by loops 45 'to 49' formed by the wire 40 'of the correcting device by wrapping around the arc 22 at the ends of the device and between the handles. By way of example, the wire 40 'forms two complete loops at each end 45' and 49 'and, in each interval 46' to 48 'between adjacent loops, four or five complete loops, for upper arch, or two complete loops for lower arc. In this way, the correction device offers greater security of use. In addition, it can be segmented (for 1, 2 or 3 teeth for example), increasing the possibilities of adaptation to the malpositions of great amplitude. Thus, a "segment" of apparatus can be limited to two loops interconnected by a part wound in several turns on the carrier arch to allow extreme rotations or a lingual movement naked vestibular teeth involved.

 A major advantage of the retractor, rectifier and corrector devices described above as well as the vestibular arc is their possibility of prefabrication and their ease of use, which guarantees the constancy of their characteristics and allows considerable time savings. for the practitioner.

 For example, the high elasticity stainless wire used to make these devices can be made of an alloy marketed under the name "Elgiloy" by the United States company "Rocky Mountain Products" alloy whose the elasticity can be very substantially increased by heat treatment after forming the device. The wire diameter can range from 0.30 to 0.35 mm, especially for incisal bow correctors or premolar second straighteners, up to 0.40 to 0.45 mm for canine retractors or vestibular arch. It should be noted that other materials may be used provided they exhibit the desired characteristics of oxidation and elasticity resistance and are fully tolerated by users.

 Of course, various modifications or additions may be made to the embodiments described above of devices according to the invention without departing from the scope of protection defined by the appended claims.

Thus, the buccal arch or envelope 22 may have a second-order bend (that is, in the substantially cylindrical surface portion
vertical axis wrapping the arcade) located from 1 to 6
mm mesial to the mesial opening of the vestibulai tubes
so molar res, if it is concavity on the gin side
to treat the incisors and by reaction of
gress the molars, or, if it is concavity of the
the occlusal, to feather the incisors without enough
of power to manipulate the molars. The consequences
these reactions on the first anchor molars
can then be fought with regard to the bow
upper arch, by a palatal bow of Nance,
which is a well-known device in itself and, as far as
relates to the lower arch, by the sub-lingual support
illustrated in Figure 9. It includes a sheet 60 in
plastic material applied to the floor of the mouth.

 The sheet -60 is preferably an elastic and flexible material, for example a foam material, with edges thick enough not to be offensive. The sheet 60 has a notch 61 so as not to risk injuring the lingual brake of the gum. The sheet 60 is extended laterally by two wires 62, 63 which are housed at their ends in lingual tubes welded to rings threaded onto the anchoring molars (only one of which is shown in FIG. 9).

 Furthermore, it is possible to add to the vestibular arc 22, facing each canine, a loop threaded on the arc or a hook fixed by micro-screw nut, to attach elastic rings of traction uni-maxillary or intermaxillary.

Claims (10)

1. A dentofacial orthopedic apparatus comprising a mesial portion with a hooking part intended to be introduced into a fastening device integral with a canine to be retracted and a distal part intended to be connected to a molar anchoring of way to transmit to the canine a force resulting from the die  elastic training of the apparatus when it is  in place, characterized in that it comprises  - a wire (10) with high elasticity  city whose mesial part (14) forms a loop  (15) can be introduced parallel to the large  axis of the tooth and in the gingival direction in  a fastener (16) fixed thereto and terminated by a  holding hook (17), said wire forming a loop (18)  of 3600 connecting its mesial part (14) to its distal part  the (11) and the portion (14a) of the mesial part  distally from the loop (15) to the loop  (18) being in the free state, inclined distally and gingi  in relation to the working position, and  an element (21) exerting an elastic force  distal traction on the mesial part (14) while being  preferably hooked between the distal end of the ap  the same and the loop (15). An apparatus according to claim 1, characterized in that said mesial portion retainer (14a) is, in the free state, inclined at approximately 450 both distally and gingivally with respect to the distal portion (11). 3. Apparatus according to any one of the claims  1 and 2, characterized in that the distal portion  (11) has a curvature (19) of the first order, so as to bring the handle (15) into a linguo position  correct vestibular. 4. Dentofacial orthopedic apparatus comprising  a mesial part with a part of attachment intended  to be introduced into a solid fastening device  of a tooth, especially a second premolar, to re  straightening and a distal portion intended to be connected to an anchoring molar so as to transmit to the tooth a force resulting from the elastic deformation of the apparatus when the latter is in place, characterized in that it comprises a high elasticity wire whose mesial portion (34) forms a loop (35) which can be introduced parallel to the major axis of the tooth and in the gingival direction in a fastener (36) fixed thereto and terminated by a hook retainer (37), the loop making the free state an angle different from 900 with the distal portion (31) of the wire to which it is connected. 5. Apparatus according to claim 4, intended to oppose the mesio-version of a second pre-fl u lar, characterized in that the angle at rest that the handle with the distal portion is about 900 . 6. Apparatus according to any one of claims 1 to 5, characterized in that the mesial portion (14; 34) has, in the free state, a first-order curvature for, when the apparatus is in place, exercise if necessary a force tending to rotate the tooth around its major axis.  7. A dentofacial orthopedic apparatus comprising latch portions for insertion into integral fixation devices of the incisors of an arch so as to transmit to the incisors a force resulting from the elastic deformation of the apparatus when the latter is in place, apparatus characterized in that it comprises a high elasticity wire forming four handles (41, 42, 43, 44) each intended to penetrate parallel to the major axis of the tooth and in the gingival direction, in a catch (51 , 52, 53, 54) attached to a respective incisor, and forming attachment portions (45 to 49, 45 'to 49') on each side of each incisor, the following wire, in the free state, the shape ideal of the arc-envelope in the incisive region. 8. Apparatus according to claim 7 for a superior arch, characterized in that the loops associated with the central incisors are shorter than those associated with the lateral incisors.  9. Apparatus according to any one of the claims  7 and 8, characterized in that the parties  stitching are formed by loops (45 'to 49')  on an arch or vestibular arch-envelope  (22).  lO. Apparatus according to any one of the claims  1 to 9, for a lower arch, characterized in that  what it is supplemented by an under lingual support intended  to be fixed at its ends lingually to the molars  anchoring and comprising a sheet (60) of plastic material  tick with soft and non-offensive edge intended to be  plicated on the floor of the mouth.  Apparatus according to claim 10, characterized  in that the sheet (60) has a notch (61)  to avoid injuring the lingual brake.