JP2012075571A - Orthodontic bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an orthodontic bracket having a superior aesthetic property, even if being molded into a complicated shape, eliminating damage of wing parts and the like when ligating an arch wire to a bracket body, and having a mechanical strength.SOLUTION: This orthodontic bracket is formed with a pair of erect walls on a base section to configure a slot for loosely fitting the arch wire between the erect walls, and is provided with tie wings projectingly extending from the erect walls in the opposite side of the base part of the erect walls. This orthodontic bracket is formed with tapers at both the erect walls forming the slot such that the mutual erect walls are gradually separated from the intermediate portions of the erect walls.

Description

  The present invention relates to an orthodontic bracket for holding an orthodontic archwire mounted on a tooth surface and spanned between predetermined teeth, and more particularly, a mechanical component having sufficient durability. The present invention relates to a high-strength orthodontic bracket.

  Conventionally, various materials such as metal, plastic, and ceramics have been used as orthodontic brackets, which are the main part of orthodontic appliances. In particular, in recent years, orthodontic brackets have been required not only for basic performance required for orthodontic treatment but also for further aesthetics.

  The metal orthodontic bracket has a high mechanical strength required for orthodontic treatment, but has a drawback of being aesthetically apt due to the metal color.

Plastic orthodontic brackets have good moldability and excellent aesthetics at the start of use, but have problems with mechanical strength and have problems such as cracking and chipping during dentist wire fastening. In addition, the mechanical strength is gradually reduced due to deterioration of the material due to long-term use in the oral cavity, and there are problems such as cracking and chipping at the time of meshing. As countermeasures, a metal skeleton is placed on the resin material to prevent breakage, or a composite resin composed of a second synthetic resin around the first synthetic resin that provides strength is adopted. In order to solve this problem, proposals have been made based on materials. (See Patent Document 1)
In addition, plastic orthodontic brackets have a problem that their aesthetics are gradually lost due to deterioration or discoloration of the material due to long-term use in the oral cavity. There are also restrictions.

  The orthodontic bracket made of ceramics can be molded into a complex shape even though it is a hard material, it can handle the complex shape required for orthodontic treatment, and it has excellent aesthetics, and it is intraoral In recent years, it has been increasingly adopted because it can be used stably without deterioration or discoloration of materials due to long-term use.

  However, the orthodontic bracket made of ceramics has a problem that it is so brittle that it is broken when a force exceeding a certain level is applied, on the other hand, which is a very hard material. Therefore, in the case of a complicated shape with overhanging tie wings, cracking or chipping may occur when a square archwire that generates particularly large force is applied and torque is applied, or an archwire using a ligature wire When tying the bracket to the bracket body, the vicinity of the tie wing where the ligature wire is hooked may be damaged, which is a problem.

  Thus, the conventional orthodontic bracket has not been able to achieve both aesthetics and mechanical strength.

JP 2001-29362 A

  Even if the present invention is excellent in aesthetics and molded into a complicated shape, the vicinity of the tie wing part where the ligature wire is hooked is damaged when the arch wire is ligated to the bracket body using the ligature wire. Therefore, an object of the present invention is to provide an orthodontic bracket having a low mechanical strength.

The present invention solves the above-mentioned problems by, for example, forming a taper on both standing walls forming the slot of the orthodontic bracket so that the standing walls gradually separate from the middle portion of the standing wall, and the present invention is completed. It came to do.
That is, the present invention
“1. By forming a pair of standing walls on the base, a slot for loosely fitting the archwire between the standing walls is constructed,
An orthodontic bracket provided with tie wings extending so as to protrude from the standing wall on the side opposite to the base of the standing wall,
An orthodontic bracket, wherein both standing walls forming a slot are tapered so that the standing walls gradually separate from the middle portion of the standing wall.
2. 2. The orthodontic bracket according to claim 1, wherein the side wall of the tie wing extending on the standing wall is formed so as to be gradually separated according to the taper of the standing wall.
3. The orthodontic bracket according to any one of Items 1 and 2, wherein the standing wall has a taper angle of 5 to 30 °.
4). The orthodontic bracket according to any one of claims 1 to 3, wherein the orthodontic bracket is integrally formed of a ceramic material.
5. The orthodontic bracket according to any one of claims 1 to 4, wherein a plurality of pairs of tie wings are provided on the standing wall. ".

  According to the present invention, it is possible to obtain an orthodontic bracket having excellent aesthetics and high mechanical strength required for orthodontic treatment. More specifically, an orthodontic bracket with a complicated shape can be molded to hold an orthodontic archwire that is attached to the surface of a tooth and spans between predetermined teeth. In particular, when a square arch wire that generates a large force is attached and torque is applied, or when the arch wire is ligated to the bracket body using a ligature wire, there is no cracking or chipping and sufficient durability It has an excellent effect that an orthodontic bracket having high mechanical strength can be obtained.

The perspective view which represented typically an example of the orthodontic bracket of this invention The perspective view which represented typically the usage example which let the arch wire pass to the bracket for orthodontics of this invention The top view and side view which represented typically an example of the orthodontic bracket of this invention The top view and side view which represented typically the orthodontic bracket which has the taper part rounded in an example of another orthodontic bracket of this invention The top view and side view which represented typically the usage example which let the square arch wire pass to the bracket for orthodontics of this invention The top view and side view which represented typically the usage example which passed the round arch wire to the bracket for orthodontics of this invention The perspective view and top view which represented typically the orthodontic bracket which comprised the standing wall high in the example of another orthodontic bracket of this invention The figure which represented typically the example of use at the time of mounting | wearing a tooth with the orthodontic bracket of this invention. A perspective view and a plan view schematically showing an example of a conventional orthodontic bracket A perspective view and a plan view schematically showing an example of another conventional orthodontic bracket

The orthodontic bracket of the present invention forms a slot in which an arch wire is loosely fitted between the standing walls by forming a pair of standing walls on the base, and the standing bracket is provided on the opposite side of the base of the standing wall. The orthodontic bracket is provided with tie wings extending so as to protrude from the wall, and the both standing walls forming the slots are tapered so that the standing walls gradually separate from the middle portion of the standing wall. It is formed.
With such a configuration, an orthodontic bracket having sufficient mechanical strength and no cracks or chips can be obtained.

The problem of breakage of the bracket is larger when a thick square wire is attached than when a thin round wire used in the initial stage of correction is generally attached, and the height that protrudes from the slot with the full width of the slot. It becomes the maximum when a square wire having a diameter is used.
When a force is applied in the direction of twisting the square wire, the force tends to concentrate at one point on the end of the bracket, but the point of action is one of the apex corners (B) of the square wire, As the point of action moves away from the base, the greater the force applied to the bracket, the higher the possibility of breakage. Therefore, in the present invention, by adopting the above configuration, it is possible to configure a tapered surface from the middle portion of the slot, and when a twisting force is applied to the wire, the portion that receives it can be lowered to the vicinity of the base portion. .
In addition, by appropriately designing the taper angle in consideration of the square wire width and the slot width, it is possible to escape so that the wire vertex angle portion does not contact the bracket even when the square wire is inclined. In that case, the boundary (A) between the standing wall and the tapered surface is in a positional relationship like a fulcrum in the lever principle, and the vertex angle portion (B) of the wire, which is the point of action, will escape from the bracket wall surface. The damage can be prevented.

As shown in FIG. 9, the conventional type has a large standing wall and is integrated with the tie wings to increase the strength. However, since the tie wings are not independent, the entire bracket is combined when ligating. Even if you want to lock the archwire with the ligature wire, you can only open the slot because the archwire is buried in the slot because the standing wall is high, that is, the slot is deep. Only one side of the side could be locked, and the treatment was limited. On the other hand, by spreading the force received by the inner wall of the bracket from the wire as in the present invention, the strength increases and the degree of freedom in design increases. There is a good effect.
In addition, there are some cases where strength is increased by designing the base to be thick and the slot to be shallow. However, since the slot is shallow, there is a problem that it is difficult to pull out the wire or to give sufficient correction force. There was also a thing.

  The orthodontic bracket of the present invention is characterized in that the side wall of the tie wing extending on the standing wall is formed so as to be gradually separated according to the taper of the standing wall. With this configuration, the effect of preventing damage to the tie wings can be obtained.

  In the orthodontic bracket of the present invention, the taper angle of the standing wall is more preferably 5 to 30 °. If it falls below this range, the wire is inclined due to play between the slot width and the wire width, and the probability that the wire is in direct contact with the slot wall increases, so that the damage prevention effect tends to be reduced. On the other hand, if it exceeds this range, shakiness will become large and it will become the tendency for the holding | maintenance force and correction force of a wire to become insufficient.

  It is preferable that the orthodontic bracket of the present invention is integrally molded from a ceramic material because the sense of unity is increased, the strength is increased, and the manufacturing can be more easily and inexpensively.

  In the orthodontic bracket of the present invention, it is preferable that a plurality of pairs of tie wings are provided on the standing wall because the ligation can be performed at a free position when ligating with a ligature wire.

Embodiments of the present invention will be described below with reference to the drawings. The description with reference to the drawings illustrates the present invention by way of example and is not limited thereto.
The orthodontic bracket of the present invention is configured in a form as shown in FIGS. The structure is made by adding appropriate amounts of binder, dispersant, mold release agent and antifoaming agent to the zirconia powder, molding the raw material by the ceramic injection molding method using the kneading machine, degreasing, It can be manufactured by a manufacturing method in which it is fired at a high temperature to obtain an orthodontic bracket.

First Embodiment FIG. 1 is a perspective view schematically showing an example of an orthodontic bracket according to the present invention.
The structure is as shown in the figure, but a slot (4) for loosely fitting an archwire (6) between the standing walls (2) by forming a pair of standing walls (2) on the base (1). And an orthodontic bracket provided with a tie wing (3) extending so as to protrude from the standing wall on the side opposite to the base of the standing wall (2), and forming a slot (4) The two standing walls (2) are formed with a taper (5) in which the standing walls (2) gradually separate from the intermediate portion (A) of the standing wall (2).
FIG. 2 shows an example in which a square arch wire is passed through the orthodontic bracket of FIG. 1, but with the above configuration, the standing wall (2) is gradually formed by the taper (5) with the intermediate portion (A) as a boundary. Because the top (B) of the square wire is not directly touching the standing wall (2) or the tie wing (3), the force applied to the wire can be dispersed, thereby preventing the bracket from being damaged. it can.
Further, when the arch wire is passed through the slot as shown in FIG. 2, the independent tie wing and the arch wire can be individually ligated by the ligature wire, which is a preferable mode.

  Moreover, it is preferable that the side wall of the tie wing (3) extended on the standing wall (2) is formed so as to be gradually separated according to the taper (5) of the standing wall (2). When the extending part of the tie wing (3) is lower than the intermediate part (A) where the taper (5) of the standing wall (2) starts, the intermediate part (A) where the taper (5) of the rising wall (2) starts It is preferable that the tie wing (3) is tapered from the middle portion of the tie wing (3) having the same height so as not to receive the force of the wire. (Not shown)

  In the same manner as described above, the taper angle of the standing wall (2) is preferably 5 to 30 °, and is preferably integrally formed of a ceramic material. Moreover, the structure which provided multiple pairs of tie wings (3) in the standing wall (2) can be taken.

  With such a configuration, an orthodontic bracket having excellent aesthetics and high mechanical strength required for orthodontic treatment can be obtained.

FIG. 3 is a plan view and a side view schematically showing an example of an orthodontic bracket of the type of the embodiment.
FIG. 4 is a plan view and a side view schematically showing an orthodontic bracket having a rounded taper (5) as a modification, and the taper (5) is an upright wall (in order to disperse the force of the wire). If 2) is configured to be gradually separated, it can be formed without any particular limitation.

  FIG. 5 is a plan view and a side view schematically showing a use example in which a square arch wire is passed through an orthodontic bracket of the type of the embodiment, but since the square wire is relatively large, the wire is changed from the wire to the bracket. The power to convey increases, which can easily cause damage to the bracket. In the example of FIG. 5, the square arch wire (6-1) is attached to the full slot width. Even if the square wire is tilted and the force is concentrated on one wing side wall, the square wire can only be tilted by the gap between the square wire and the slot, so that it cannot contact the taper (5) of the standing wall (2). You can see that the standing wall is protected.

  FIG. 6 shows an example of use through a round arch wire, but it can be seen that even a round wire can be mounted without any problem. In this case, the force applied to the bracket is not so great, so there is little risk of breakage.

  FIG. 7 is a perspective view and a plan view schematically showing an orthodontic bracket in which an upright wall (2) is configured to be high in an example of another orthodontic bracket. Although there are some restrictions on the ligation method, the reinforcing effect is increased, and it can be used effectively by properly using it depending on the part and time when the force is applied.

  INDUSTRIAL APPLICABILITY The present invention can be used as an orthodontic bracket for holding an archwire that is mounted on the surface of a tooth and spanned between predetermined teeth.

DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Standing wall 3 ... Tie wing 4 ... Slot 5 ... Taper 6 ... Arch wire 6-1 ... Square arch wire 6-2 ... Round arch Wire 7 ... Orthodontic bracket 8 ... Tooth

Claims (5)

  A tie is formed so as to form a slot for loosely fitting an archwire between the standing walls by forming a pair of standing walls on the base, and to protrude from the standing wall on the opposite side of the base of the standing wall An orthodontic bracket provided with a wing, wherein both standing walls forming a slot are formed with a taper in which the standing walls are gradually separated from an intermediate portion of the standing wall. .   The orthodontic bracket according to claim 1, wherein a side wall of the tie wing extending on the standing wall is formed so as to be gradually separated according to a taper of the standing wall.   The orthodontic bracket according to claim 1, wherein the standing wall has a taper angle of 5 to 30 °.   The orthodontic bracket according to any one of claims 1 to 3, wherein the orthodontic bracket is integrally formed of a ceramic material.   The orthodontic bracket according to any one of claims 1 to 4, wherein a plurality of pairs of tie wings are provided on the standing wall.

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