JP4421354B2 - Orthodontic wire ligation member - Google Patents

Description

  The present invention relates to an orthodontic wire ligating member used for orthodontic treatment. More specifically, the present invention relates to an orthodontic wire ligating member in which a synthetic resin ligating member is engaged with a bracket to hold an arch wire.

  Treatment methods that use brackets, tubes, etc. for orthodontic treatment of dentitions with poor alignment are well known. The orthodontic method involves attaching a bracket or the like to the tooth, and by applying an archwire attached to the bracket or the like to a mechanical tension force, that is, an elastic restoring force such as pressing, pulling back, twisting, etc. The dentition is corrected by changing the position. In this treatment method, the bracket is formed with a slot for stopping the archwire at the center of the main body, and a wing is provided on the outer side of the main body. The arch wire is held in the slot by the ligating means.

  As the ligating means, for example, a stainless steel ligature wire (ligating wire) is used, or an arch wire is ligated to the bracket using a polyurethane O-ring or module. When these ligature wires, O-rings, and modules are mounted or replaced, a force of 2 to 3 N (Newton) or more is loaded on the teeth as vibrations, which causes pain in the patient.

  The conventional example shown in FIG. 18 is an example in which an O-ring 50 made of an elastic material is used and an archwire 51 is ligated to a bracket 52. In the case of this ligation example, the O-ring 50 is attached by winding the wing of the bracket 52, and the arch wire 51 is held by the bracket 52 by an elastic force.

On the other hand, the ligation method using a wire is a method that has been generally used from the past, using a pliers according to the application, and gripping the wire at the tip of the pliers and operating the arch wire on the bracket. Ligated. Some use an O-ring made of a thermoplastic synthetic resin elastomer such as silicon rubber or polyurethane (for example, Patent Documents 1 and 2).
Further, there are a slide member that caps by sliding, and a self-ligating orthodontic bracket that can ligate an archwire with a simple operation using a ligating means having a spring effect (for example, Patent Document 3). 4).
U.S. Pat. No. 4,038,753 U.S. Pat. No. 4,950,158 Japanese Patent Laid-Open No. 08-052159 JP-A-10-192302

  In orthodontic treatment, a tooth is moved using an orthodontic device such as a bracket or wire while applying a force to the tooth in a three-dimensional direction. If you want to make this movement efficiently, friction-free that minimizes the frictional force that is not necessary when generating the force necessary for correction between the slot of the wire and the bracket. (In the present invention, the frictional force can be reduced. It is better to move the teeth by sliding with a low frictional force. In the conventional method using a metal wire or ligation method using rubber or the like, the wire is pressed into the slot of the bracket with an excessive pressing force, and a static friction force other than the corrective force necessary for physiologically moving teeth, The shearing stress etc. by the wire are generated, making it difficult to move the teeth.

  For this reason, as correction progresses, excessive force other than the force necessary to move the patient's teeth is applied, giving the patient a sense of foreign body, irritation to the oral mucosa, pain during treatment, etc. . The self-ligating bracket uses a slide member, a spring body, etc., so the bracket has a large and complicated structure, and the slide member and the spring body are used as the bracket. On the other hand, when attaching and detaching, a special tool may be required, and skill of an orthodontist is required for ligation.

  Moreover, the conventional ligation methods described above are unsanitary because they leave freckle and plaque on those members. In addition, the shape has many irregularities, so that it has a problem from the aesthetic point of view. For this reason, there is a need for a ligation technique in which a patient has little correction pain and can be easily ligated with a simple configuration on the ligation side.

The present invention has been invented in the background as described above, and achieves the following objects.
An object of the present invention is to provide an orthodontic wire ligating member in which an arch wire can be easily ligated to a bracket and a tube with a simple configuration of ligating means.
Another object of the present invention is that the tooth can be moved with friction free (in the present invention, the state in which the frictional force can be reduced) or with low frictional force. An object of the present invention is to provide an orthodontic wire ligating member that is shortened.
Still another object of the present invention is to provide an orthodontic wire ligating member that reduces the pain of the patient because the tooth can be moved with a small correction force.
Still another object of the present invention is to provide an orthodontic wire ligation member having an arch wire holding structure with less irregularities and a smooth outer shape with a curved outer surface shape and improved aesthetics. There is to do.
Still another object of the present invention is to provide an orthodontic wire ligation member in which the ligation means can be easily attached to and detached from an existing bracket.

The present invention takes the following means in order to solve the object.
The wire ligating member for orthodontics of the present invention 1 is
A ligating member for engaging and holding the archwire inserted into the groove of the orthodontic bracket with the bracket,
The ligating member is a member made of a synthetic resin that is elastically deformed, and is detachably locked to the bracket, and at least two locking portions that are spaced apart from each other;
A back portion that is integral with the two locking portions, is curved and elastically deformed, engages with the bracket, and holds the archwire ;
The back portion is formed integrally with the back portion, and has a wire keeper (2c) that is thick enough to form a gap so as not to contact the upper surface of the arch wire inserted into the groove portion. And
The locking portions are protrusions that are disposed at both ends of the back portion and are locked into the recesses of the lower portion (3a) of the wing of the bracket, along the longitudinal direction of the archwire and from the back portion. It consists of leg parts (2b) which are provided to project on both sides .

The orthodontic wire ligating member of the present invention 2 is the present invention 1,
The synthetic resin is at least one selected from polyamide, polyacetal, and polycarbonate, and has a tensile strength at break of 55 MPa or more, a bending strength of 80 MPa or more, a flexural modulus of 2500 MPa or more, and an impact value of 50 J / m or more. It is characterized by being.

The wire ligating member for orthodontics of the present invention 3 in the present invention 1 or 2,
The bracket is characterized in that the surface shape substantially parallel to the joint surface bonded to the tooth surface is a curved surface.

The wire ligating member for orthodontics of the present invention 4 in the present invention 1 or 2,
The arch wire is an orthodontic nickel-titanium alloy and has a diameter of 0.20 mm to 0.35 mm.

The wire ligating member for orthodontics of the present invention 5 in the present invention 4,
The polyurethane elastic chain for engaging with the bracket has a thickness of 0.2 mm to 0.3 mm.

The orthodontic wire ligating member according to the present invention can be easily cleaned and the food basket is unlikely to remain.
In addition, since the orthodontic wire ligating member does not have a cut end of the wire as in the conventional wire ligating means, it is possible to reduce discomfort and irritation in the oral cavity, and to improve cleanability.
Furthermore, since this orthodontic wire ligating member can move the tooth with a small correction force, use an elastic member with a thinner wall thickness, such as an arch wire for correction, an elastic chain, etc., which is thinner than existing products. Can do.
Further, this orthodontic wire ligating member also has an effect that dirt is less noticeable and does not deteriorate than conventional O-rings and modules that are synthetic resin elastic bodies.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an external view showing an embodiment of an orthodontic wire ligating member of the present invention, and is an external view when used in a twin type bracket 1. FIG. 2 is an external view of only the bracket 1. The orthodontic wire ligation member 2 is attached to the bracket 1 and used as shown in FIG. The bracket 1 shown in FIG. 1 is made of a twin type transparent synthetic resin having two sets of wings 3 arranged in parallel, that is, wings 3 composed of four overhanging portions (portions protruding outward like a roof). It is a bracket. A concave groove-like slot 5 for penetrating and holding the arch wire 4, that is, a groove for inserting and sliding the arch wire 4 is formed at the position of the central portion of the bracket 1.

  Many types of brackets 1 are known, such as a single bracket, a metal groove member that guides an archwire, and an extension portion. The orthodontic wire ligating member 2 of the present embodiment will be described for an example applied to the twin-type bracket 1 described above. However, the orthodontic wire ligating member 2 can be applied to other existing shapes of brackets. The bracket 1 can be applied to any bracket such as a metal bracket, a plastic bracket, and a ceramic bracket. Further, the orthodontic wire ligating member 2 can be applied to a buccal tube type used in a molar portion as described later.

  The bracket 1 has a slightly different shape depending on the part of the tooth to be attached, for example, for incisors, for canines, for premolars. In addition, various brackets are known that have different torques, angulations, etc., or different shapes depending on the direction of the teeth to be corrected. The bracket 1 is basically provided with a slot 5 for penetrating the arch wire 4 at the center and a wing 3 for ligation on the side wall.

  Some brackets 1 are provided with a hook depending on the type. This lower surface is a joint surface 7 to the tooth, and is adhered to the tooth surface via an adhesive. Since the basic structure and function of the main body of these brackets 1 are well known and not the gist of the present invention, detailed description thereof will be omitted. In order to support the inserted arch wire 4 to the bracket 1, conventionally, a stainless thin wire (ligating wire, ligature wire) is used and entangled with the wing 3. In the O-ring method, the O-ring is hooked on the wing 3 to support the arch wire 4 in the slot 5 of the bracket 1.

The orthodontic wire ligating member 2 according to the present embodiment does not fix the arch wire 4 to the slot 5 but supports (moves) the arch wire 4 in the slot 5 and slides the arch wire thereon. There is a feature in the ease, and there is a feature in the structure and function of the orthodontic wire ligating member 2 for that purpose. The orthodontic wire ligating member 2 is a molded product made of synthetic resin, and the synthetic resin material is so-called engineering plastic.
The engineering plastic is composed of one or more selected from polyamide, polyacetal, polycarbonate and the like. What is necessary is just to select the material of the bracket 1 according to a use. The optimum characteristic values of the engineering plastic used in this embodiment are a tensile breaking strength of 55 MPa or more, a bending strength of 80 MPa or more, a flexural modulus of 2500 MPa or more, and an impact value of 50 J / m or more.

  Next, the orthodontic wire ligating member 2 according to the embodiment of the present invention will be described in detail. FIG. 2 is an external view showing a single unit of the twin type bracket 1. A slot (wire insertion groove) 5 for holding the arch wire 4 is provided at the center of the bracket 1. Further, two sets of wings 3 that are parallel to each other in the direction crossing the slot 5, that is, four projecting portions are projected from the central portion and provided on both sides. The lower part 3 a of each wing 3 is concave, and a groove 6 is formed between the two sets of wings 3. The joint surface 7 of the bracket 1 to be bonded to the tooth surface has an uneven shape and enhances the adhesion to the tooth surface.

  On the other hand, the orthodontic wire ligating member 2 is shown in FIGS. FIG. 4 is a side view of FIG. The orthodontic wire ligating member 2 is formed of a thermoplastic synthetic resin, and includes leg portions 2b arranged at both ends, a wire keeper 2c arranged at the center thereof, and a back portion 2a connecting them. ing. The leg part 2b arrange | positioned at both ends and the wire keeper 2c arrange | positioned in the center part are arrange | positioned so that it may mutually become parallel, and are integrally connected by the back part 2a arrange | positioned in the center part of those length directions.

  In other words, the leg portion 2b and the wire keeper 2c have a structure projecting and projecting on both sides with respect to the I-shaped back portion 2a that is a central member. It has a shape in which the English letter E is axisymmetric (see FIG. 3). As shown in FIG. 1, the leg portion 2 b is engaged with the lower portion 3 a of the wing 3 of the bracket 1. As described above, the back portion 2a is formed with the wire keeper 2c so as to cross (cross) with the back portion 2a. The wire keeper 2 c is a portion that is inserted into the slot 5 of the bracket 1.

  Since the lower surface of the wire keeper 2c is disposed on the upper surface of the arch wire 4, the distance from the arch wire 4 can be adjusted by changing the thickness of the wire keeper 2c. That is, in the initial stage of orthodontic treatment, the thickness of the wire keeper 2c is such that a gap is formed so that the lower surface of the wire keeper 2c and the upper surface of the arch wire 4 do not contact each other. For this reason, since there is little friction between the wire keeper 2c and the arch wire 4, the arch wire 4 can make the state which is easy to slide freely in the slot 5. FIG.

  In the middle stage and the later stage of orthodontic treatment, since the large movement is not required, the thickness of the wire keeper 2c is set so that the lower surface of the wire keeper 2c and the upper surface of the arch wire 4 are in contact with each other. By this contact, the torque of the arch wire 4 can be effectively transmitted to the bracket 1, so that there is an advantage that the therapeutic effect is improved. The orthodontic wire ligating member 2 is elastically deformed. As shown in FIG. 4, when a force F is applied from the outside, for example, with a finger, the legs 2b are spread outward as indicated by double arrows. It is done. When the finger is released, the leg 2b is restored to its original shape.

  Therefore, when the orthodontic wire ligating member 2 is pushed into the bracket 1, the elastic deformation of the orthodontic wire ligating member 2 is used to push the orthodontic wire ligating member 2 with a fingertip or a simple pushing tool at a stretch. The ligating member 2 can be assembled to the bracket 1. When the orthodontic wire ligating member 2 is removed from the bracket 1, the back portion 2a of the orthodontic wire ligating member 2 is cut off with a blade and the removed orthodontic wire ligating member 2 is disposed of. . The orthodontic wire ligating member 2 is a small molded product and is a simple and low-cost part, so it is treated as a consumable. The orthodontic wire ligating member 2 is not usually formed as a single unit, and is formed by integral molding, for example, by forming a continuous body of 20 teeth in one patient.

  FIG. 1 is an external view when an orthodontic wire ligating member 2 is attached to an existing bracket 1. On the other hand, what is shown in FIG. 5 is an example in which the external appearance of the bracket is modified to be a curved surface. Since the bracket 8 is bonded to the tooth surface, the food basket tends to accumulate. The ideal shape is as small as possible without any foreign matter. The bracket 8 shown in FIG. 5 has a generally smooth shape, and the orthodontic wire ligating member 2 is also continuously smooth according to the shape of the bracket 8 so as to match the bracket 8. It is possible to make the appearance of a simple curved surface.

  The leg portion 2b of the orthodontic wire ligating member 2 is roughly shaped as if the English letter E is line-symmetrical with the back portion 2a as the center as shown in FIG. Accordingly, the leg portion 2b of the orthodontic wire ligating member 2 is engaged with the lower portion 8b of the wing 8a in a compact shape. Thus, the orthodontic wire ligating member 2 itself can be made compact. Since the outer surface of the bracket 8 is formed with a curved surface, the sanitary structure can be made without a foreign object feeling in which food traps are less likely to accumulate than in the past.

  Moreover, since it is a continuous smooth curved surface shape, it is an aesthetically effective shape. Furthermore, since the orthodontic wire ligating member 2 is made of synthetic resin, it is also compatible with the bracket 8 made of synthetic resin of the same material. Further, since the orthodontic wire ligating member 2 is a molded product of synthetic resin, various types of structures can be molded relatively easily according to the form of correction. The back portion 2a and the wire keeper 2c of the orthodontic wire ligating member 2 of the embodiment shown in FIG. 5 have substantially the same structure and function as those of the above-described embodiment.

  As shown in FIG. 1, the archwire 4 is inserted along the slot 5 when correcting a tooth. The arch wire 4 is positioned slightly below the upper surface of the groove 6 of the bracket 1. After the arch wire 4 is inserted into the slot 5, the orthodontic wire ligating member 2 is inserted into the groove 6 of the bracket 1. The orthodontic wire ligating member 2 has a width and other dimensions that match the bracket 1 so that it can be inserted into the groove 6, so that it is inserted without any gaps more than necessary when inserted.

  If the force is still applied after being inserted, the leg 2b is spread along the outer surface of the wing 3 and is fitted into the recess of the lower portion 3a of the wing 3. The back portion 2 a of the orthodontic wire ligating member 2 is held between the wings 3 and fixed on the upper surface of the groove 6 that is a recess of the bracket 1. The arch wire 4 is held without being pressed against the back portion 2a. By this holding, the arch wire 4 can be freely moved in the longitudinal direction (slot direction) while applying a force to the surface of the slot 5 during correction.

  FIG. 6 is an external view when the orthodontic wire ligating member 2 is applied to the single bracket 9 shown in FIG. FIG. 6 shows the orthodontic wire ligating member 2, and FIG. 7 shows a single structure of the single bracket 9. The single bracket 9 has a configuration in which a pair of wings 9a are provided on both sides of the bracket body, and there is no recess, that is, a groove, for positioning the back portion 2a between the wings 9a. This orthodontic wire ligating member 2 has a structure without the leg 2b as shown in FIG. The back portion 2a and the wire keeper 2c of the orthodontic wire ligating member 2 shown in FIG. 6 have substantially the same structure and function as those of the above-described embodiment.

  The orthodontic wire ligating member 10 shown in FIG. 8 is obtained by forming the back part 2a of the orthodontic wire ligating member 2 shown in FIG. 6 and the upper surface of the wire keeper 2c on the same curved surface. The back portion 10a and the wire keeper 10c of the orthodontic wire ligating member 10 have substantially the same structure and function as those of the above-described embodiment. The brackets shown in FIGS. 9 to 11 show other shapes of brackets. The leg portion 10b of the orthodontic wire ligating member 10 shown in FIG. 8 has a shape that does not have a protruding portion along the longitudinal direction of the arch wire 4, but the leg portion 10b is an elliptical bracket 11 by the same operation as described above. In the recess or hole.

The elliptical bracket 11 has an elliptical shape when viewed from a direction perpendicular to the tooth surface. The ellipse bracket 11 may be a circle instead of an ellipse, and has a shape that draws a closed curve. The elliptical bracket 11 is not provided with a wing. A slit 11a for installing the arch wire 4 and a second groove 11b for holding the orthodontic wire ligating member 10 are provided in a direction crossing the slit 11a.
A groove or hole 11c is formed at the end of the elliptical bracket 11 at the end along the second groove 11b. The back part 10a of the orthodontic wire ligating member 10 is configured to hold the upper part of the arch wire 4 in the same manner as described above, and the leg part 10b is fitted into the groove or hole 11c of the elliptical bracket 11. When the orthodontic wire ligating member 10 is in a ligated state, the upper surface of the back portion 10a of the orthodontic wire ligating member 10 coincides with the surface of the elliptical bracket 11.

Therefore, the external appearance of the orthodontic wire ligating member 10 can realize a smooth curved surface as a whole. This curved surface enhances aesthetics and has an effect of preventing food sticks from adhering. Next, as another embodiment of the orthodontic wire ligating member 10, FIG. 12 shows an orthodontic wire ligating member 12 provided with overhang portions 12c on both sides of the back portion 12a. This orthodontic wire ligating member 12 is applicable to the single bracket 9 shown in FIG. The archwire 4 can be held without providing a recessed portion in the existing single bracket.
That is, when the orthodontic wire ligating member 12 is fitted into the single bracket 9, the back portion 12a covers the upper surface of the single bracket 9 with the overhanging portion 12c sandwiching the single bracket 9, and the leg portion 12b is a lower portion of the wing 9a. It is inserted. Thereby, the orthodontic wire ligating member 12 can hold the arch wire 4 without any positional displacement in the longitudinal direction of the arch wire 4.

  FIG. 14 and FIG. 15 show an example in which the orthodontic wire ligating member of the present invention is applied to a lingual (lingual side) bracket 13. The lingual bracket 13 shown in FIG. 13 is a known one for attaching and correcting on the back side of a tooth. Since it cannot be seen from the outside, it has the same aesthetic features as a normal dentition, but it has the drawback of being difficult to correct. The orthodontic wire ligating member of the present invention can also be applied to this type of orthodontic method. FIG. 13 shows an external appearance of the lingual bracket 13, and a dedicated ligating member 14 is attached to the wing 13a of the lingual bracket 13 and used as shown in FIG.

  The leg portion 14b of the orthodontic wire ligating member 14 is fitted into the wing 13a, the back portion 14a is covered with the upper surface of the lingual bracket 13, and the opposite leg portion 14c is fitted into the neck portion 13b of the lingual bracket 13 to lock the arch. In this configuration, the wire 4 is held. The wire keeper 14d has substantially the same structure and function as the above-described embodiment. 15 is for premolars, but the orthodontic wire ligation member 16 can be attached to the lingual bracket 15 with the same configuration as described above. It can be attached by engaging the leg portion 16b of the orthodontic wire ligating member 16 with the wing 15a of the lingual bracket 15. The back portion 16a and the wire keeper 16c of the orthodontic wire ligating member 16 have substantially the same structure and function as those of the above-described embodiment.

  16 and 17 are examples in which the orthodontic wire ligating member of the present invention is applied to a molar tube, a buccal tube, or the like. The one shown in FIG. 16 is of a double convertible type, and the tube is of a type that can pass two wires. In this embodiment, the leg portion 18b of the orthodontic wire ligating member 18 is fitted into the wing 17a of the tube 17 so that the orthodontic wire ligating member 18 is covered from the upper surface in the same manner as described above. The back portion 18a and the wire keeper 18c of the orthodontic wire ligating member 18 have substantially the same structure as that of the above-described embodiment.

   The bracket 19 with a hook shown in FIG. 17 is of a single convertible type, but this type also has an orthodontic wire ligating member covered with the orthodontic wire ligating member 20 from the upper surface of the bracket 19 as described above. The back portion 20a of 20 and the wire keeper 20c are inserted into the groove and the slot, and the leg portion 20b is fitted and fixed to the wing 19a of the bracket 19. If the bracket 19 has a wing of a standard type, it is used, and if not, a bracket provided with a portion for engaging the orthodontic wire ligating member 20 is created. The back portion 20a and the wire keeper 20c of the orthodontic wire ligating member 20 have substantially the same structure as the above-described embodiment.

  The operation of the embodiment described in detail above is summarized as follows. The conventional fixing method using the orthodontic wire ligation member is complicated and requires a high degree of skill for the orthodontist, but when the orthodontic wire ligation member of this embodiment is applied, the treatment is It can be done in a short time, and the patient's correction pain can be greatly reduced. Although the shape of the bracket is not limited to the conventional shape, the treatment effect of orthodontics can be further improved by using an optimal one that is compatible with the orthodontic wire ligating member of the present embodiment.

  An existing device that can be used for tooth movement and can develop corrective force is based on the premise that archwire, elastic, coil spring, etc. work with a force of at least about 0.59-0.69 N (Newton) or more per tooth. Designed. In order to express this orthodontic force with a conventional apparatus, for example, an arch wire made of an orthodontic nickel / titanium alloy generally has a minimum diameter of about 0.36 mm. Further, in order to partially supplement the correction force, the polyurethane elastic chain used by being engaged with the bracket is required to have a thickness of about 0.4 mm as a minimum thickness.

  In the apparatus of this embodiment, this is an archwire made of an orthodontic nickel / titanium alloy and has a smaller diameter of 0.25 mm (± 0.02 mm) or 0.3 mm (± 0.02 mm). With the thing, correction became possible. Further, the polyurethane elastic chain can be corrected with a thickness of approximately 0.2 mm or 0.3 mm. That is, as understood from the sizes of the archwire and the elastic chain, the present embodiment is a treatment system that has a shorter period of time and less patient pain than the conventional apparatus.

  In particular, the effect of the system according to the present embodiment is remarkable in leveling in the initial stage of orthodontic treatment, and there is also a knowledge example in which tooth movement can be performed at a speed about twice or more that of the prior art. In addition, since the tooth can be moved with a smaller correction force than in the past, most patients felt pain in the conventional correction method, but in this embodiment, the patient has less pain. The rate at which patients complain of pain was approximately 10% in the present inventors' trial.

  Furthermore, since the archwire is attached along the dentition, the slot direction of the bracket coincides with the dentition direction. Since there are few unevenness | corrugations along this dentition direction and it becomes smooth attachment, it becomes a structure which cleaning is easy and a food basket does not remain easily. Therefore, orthodontic correction with a clean feeling can be achieved as compared with the prior art. In addition, since the bracket can be made small, the bracket itself can be miniaturized and the structure is excellent in aesthetics. Although the embodiment of the present invention has been described above, it goes without saying that the specific configuration of the present invention is not limited to this embodiment.

FIG. 1 shows an orthodontic wire ligating member of the present invention, and is an external view when this is applied to a twin type bracket. FIG. 2 is an external view showing a twin type bracket alone. FIG. 3 is a front view of the ligating member shown in FIG. FIG. 4 is a side view of FIG. FIG. 5 is an external view of an orthodontic wire ligation member when the ligation member is applied to a bracket having another shape. FIG. 6 shows an orthodontic wire ligating member according to still another embodiment of the present invention, and is an external view in which this is applied to a single type bracket. FIG. 7 is an external view showing a single type bracket alone. FIG. 8 is an external view showing an orthodontic wire ligation member according to still another embodiment of the present invention, and an example of a ligation member having a leg portion that is substantially I-shaped with the same width as the back portion. FIG. 9 is a front view of an orthodontic wire ligation member when a substantially I-shaped ligation member is applied to an elliptical bracket. FIG. 10 is a side view of FIG. 11 is a cross-sectional view taken along line XX in FIG. FIG. 12 shows an orthodontic wire ligation member according to still another embodiment of the present invention, and is an external view showing a modified example of a ligation member whose legs are substantially I-shaped with the same width as the back. FIG. 13 is an external view showing a single lingual type bracket. FIG. 14 shows an orthodontic wire ligating member according to still another embodiment of the present invention, and is an external view when applied to a lingual type bracket. FIG. 15 shows an orthodontic wire ligating member according to still another embodiment of the present invention, and is an external view when applied to another lingual type bracket. FIG. 16 shows an orthodontic wire ligating member according to still another embodiment of the present invention, and is an external view when applied to a buccal tube. FIG. 17 shows an orthodontic wire ligating member according to still another embodiment of the present invention, and is an external view when applied to a bracket with a hook. FIG. 18 is an external view showing a state in which an O-ring made of an elastic material is wound around a wing of a bracket and an arch wire is ligated, which is a conventional device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bracket 2 ... Orthodontic wire ligation member 3 ... Wing 4 ... Arch wire 5 ... Slot (wire insertion groove)
6 ... Groove

Claims (4)

A ligating member for engaging and holding the archwire inserted into the groove of the orthodontic bracket with the bracket,
The ligating member is a member made of a synthetic resin that is elastically deformed, and is detachably locked to the bracket, and at least two locking portions that are spaced apart from each other;
A back portion that is integral with the two locking portions, is curved and elastically deformed, engages with the bracket, and holds the archwire;
The back portion is formed integrally with the back portion, and has a wire keeper (2c) that is thick enough to form a gap so as not to contact the upper surface of the arch wire inserted into the groove portion. And
The locking portions are protrusions that are disposed at both ends of the back portion and are locked into the recesses of the lower portion (3a) of the wing of the bracket, along the longitudinal direction of the archwire and from the back portion. It consists of legs (2b) that are provided on both sides.
An orthodontic wire ligating member characterized by the above. In the orthodontic wire ligation member according to claim 1,
The synthetic resin is at least one selected from polyamide, polyacetal, and polycarbonate, and has a tensile strength at break of 55 MPa or more, a bending strength of 80 MPa or more, a flexural modulus of 2500 MPa or more, and an impact value of 50 J / m or more. is there,
An orthodontic wire ligating member characterized by the above. In the orthodontic wire ligation member according to claim 1 or 2,
An orthodontic wire ligating member characterized in that the bracket has a curved surface shape substantially parallel to a joint surface bonded to a tooth surface. In the orthodontic wire ligating member according to claim 1 or 2,
The arch wire is an orthodontic nickel-titanium alloy and has a diameter of 0.20 mm to 0.35 mm.

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