JPH08150152A - Dentition correcting tool - Google Patents

Abstract

PURPOSE: To provide a dentition correcting tool which can work well with all dental treatment stages from the coarse aligning stage to right position correcting stage by forming a bracket furnished on the tool from a bracket lid and bracket body, and performing fitting and removal on/from the bracket body through utilization of the elastic deforming ability of the bracket lid. CONSTITUTION: A bracket of a dentition correcting tool is composed of a bracket body 32 fixed to a tooth surface and a bracket lid 33 to enclose the bracket body, and these are shaped elliptically. The bracket lid 33 is made of an elastic material, and the bracket body 32 is made attachable to the surface of a tooth of patient by a bonding agent which is applied on the adhesion surface. To install an arch wire, it is previously accommodated in a wire inserting groove 37 formed in the bracket body 32, and the lid 33 is fitted on the bracket body 32 in such a condition as pressed in the direction of Arrow G and spread a little in the H-direction in elastic deformation, and then is wound tightly by disengaging the pressing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental orthodontic appliance.

[0002]

2. Description of the Related Art Poor dentition, such as random pile teeth and double teeth, is not only bad in appearance, but plaque easily accumulates in places with bad dentition, resulting in caries and alveolar pyorrhea. In the recent field of dental treatment, orthodontic treatment for patients with poor dentition has come to be widely used because of the cause.

An orthodontic treatment method involves fixing an orthodontic bracket to the surface of each tooth with an adhesive or the like, passing an archwire through each orthodontic bracket, and pressing the archwire with a restoring force of the archwire.・ By applying an external force such as pulling back and twisting, the dentition is displaced to the correct position and direction for correction.

FIG. 8A is a perspective view showing a conventional orthodontic bracket (bracket 52 and mounting wire 56) and the arch wire 2, and FIGS. 8B and 8C are bb lines thereof. FIG. Bracket 52 has its adhesive surface 5
2a is bonded to the surface of a tooth (not shown) by an adhesive, and the arch wire 2 is fitted to the fixing base 52b provided on the bracket 52, and the mounting wire 56 is wound around the mounting wire groove 52c and tightened 56c. As a result, the arch wire 2 is pressed and fixed to the bracket 52. Hereinafter, this orthodontic appliance is referred to as a conventional example. The fixing base 52b of the bracket has a grooved shape with its front opened so that the archwire 2 can be fitted from the front when the archwire 2 is attached to the bracket 52. Hereinafter, this orthodontic appliance is referred to as a conventional example.

As a treatment procedure for orthodontics, first, rough orthodontics is first performed as a first-stage treatment for irregularly piled teeth (hereinafter referred to as rough alignment step). The degree of fixation of the arch wire to the orthodontic appliance at this stage is not firm, and there is some play. Without such play, an excessive pressing force is applied to the teeth, which not only causes discomfort to the patient but also may cause local correction, which may cause the teeth to move to the correct position. Problems also occur from a broad perspective.

Therefore, generally, the arch wire 2 at the rough alignment stage has a round cross section, and the bracket 52 is used.
The fixing to the fixing base 52b is in a loose fixing state with play as described below. That is, as shown in FIG. 8B, when the round arch wire 2 is used, it comes into point contact with the fixing base 52b of the square groove, and since the arch wire 2 has a circular cross section, its contact point. Is not easily fixed because it is easily changed by twisting the arch wire 2. Further, at the rough alignment stage, the fastening degree of the mounting wire 56 is also moderate. Therefore, the degree of fixing the arch wire to the orthodontic bracket is weak as a whole.

In this way, the teeth whose teeth are roughly arranged are
It is precisely corrected in the next treatment stage (hereinafter, referred to as a correct position correction stage). At this stage, the arch wire 2 having a rectangular cross section is used, and the mounting wire 56 is tightly wound to fix the arch wire 2 to the bracket 5.
Firmly press on 2 and fix. As shown in (c) of FIG. 8, when the rectangular archwire 2 is used, the fixing base 52 for the square groove is formed.
Since it will be fitted tightly in surface contact with b, the square arch wire 2 will not roll,
The torque according to the designed torque angle θ continues to be applied correctly, and the distortion of the tooth in the front-back direction can be corrected to the correct angle arrangement.

Various orthodontic appliances other than the above-mentioned conventional examples have been proposed, for example, Japanese Patent Application Laid-Open No. 56-1.
The orthodontic appliance disclosed in Japanese Patent No. 12238 includes a bracket main body and a lid.

In the conventional example, as shown in the perspective view of FIG. 9, a lid 88 is provided with an elastic engaging portion 89 in which an axial cut is formed in a bent piece on the peripheral edge, and a bracket main body 87 is provided. A wire mounting groove 80 and a locking portion 81 are provided. When fitting the bracket lid to the bracket main body, the arch wire 2 is arranged in the wire mounting groove 80, and each edge of the elastic engaging portion 89 is pressed so as to be pressed in the central direction, so that the peripheral edge of the locking portion 81 is fixed. Fit them so that they are sandwiched. When removing, the central portion of the lid 88 is pressed (in the direction of arrow P) to expand the elastic engagement portion 89 to the outside, and the fitting is released to remove the lid 88.

[0010]

However, in the above-mentioned conventional example, since the bracket 52 is formed with a large number of irregularities, and the irregularities are further increased by fastening with the mounting wire 56, food is accumulated in the irregularities. Since it is easy and brushing with a toothbrush is difficult to reach, there is a problem that plaque accumulates and the mouth becomes unsanitary.

On the other hand, in the above-mentioned conventional example, since the problem of dental plaque is relatively small because it has a shape with little unevenness, a torque for correction is applied when it is desired to perform the treatment in the correct position correction step. However, there is a problem in that the lateral movement of the archwire 2 cannot be stopped. That is,
In the conventional example, the central portion of the lid body 88 is pressed to remove the lid body 88. Therefore, the arch wire 2 and the lid body 88 are naturally included.
It requires a space between the inner surface of and. If a space is formed, the arch wire 2 will float and cannot be firmly fixed. If it cannot be firmly fixed, the torque cannot be moved, and the lateral movement of the archwire 2 cannot be stopped.

For this reason, in the conventional orthodontic appliance, if it is desired to apply torque or to stop the lateral movement of the arch wire, a separate auxiliary fastening means, specifically, a ligation wire is required. Become. Then, as described in the conventional example of FIG. 8, unevenness is generated, and there is a problem that plaque is liable to be formed and the mouth becomes unsanitary.

The present invention has been made in view of the above problems, and it has a shape that does not easily cause plaque, and does not require an auxiliary ligation wire even in the correct position correction step of treatment, and the torque An object of the present invention is to provide an orthodontic appliance that can accurately move and stop the lateral movement of the archwire.

[0014]

In the orthodontic bracket according to the present invention, the bracket lid is made of an elastic material, and both the bracket lid and the bracket body are oval. Either the long axis or the short axis of the bracket lid is longer than either the long axis or the short axis of the bracket body, and the other of the long axis or the short axis of the bracket lid is the long axis or the short axis of the bracket body. The gist is that it is shorter than the other of the short axes.

Alternatively, the bracket lid is made of an elastic material, and one of the bracket lid and the bracket main body is circular and the other is elliptical, and the major axis of the elliptical bracket lid is The minor axis of the elliptical bracket lid that is longer than the diameter of the circular bracket body is shorter than the diameter of the circular bracket body, or
Alternatively, the gist of the circular bracket lid is that the diameter is longer than the major axis and shorter than the minor axis of the elliptical bracket body.

Further, the orthodontic bracket includes a bracket and a lock pin for positioning the arch wire on the bracket. The bracket body is provided with an arch wire insertion groove and a lock pin insertion passage. It is preferred that the pin is arcuate and that the lock pin insertion passage is arcuate with a radius of curvature that is the same as or slightly smaller than that of the lock pin.

[0017]

The bracket of the present invention comprises a bracket lid and a bracket body, and the elastic deformation of the bracket lid is used to perform fitting and unmounting to and from the bracket body. That is, the elastically deformed bracket main body has a shape that allows it to be loosely fitted to the bracket main body, and if the elastic deformation is released in the loosely fitted state, the bracket main body returns to the state before the deformation and clamps and fixes the bracket main body. . In order to realize this pinching and fixing, the bracket lid and the bracket body must have non-similar shapes, and as a condition therefor, the length relationship between the major axis and the minor axis (or diameter) described above was set. Of.

[0018]

【Example】

<Embodiment 1> FIG. 1 is a front view showing an orthodontic bracket (bracket) according to Embodiment 1 of the present invention. FIG. 1 (a) is a bracket lid 33, and FIG. 1 (b) is a bracket body. 32,
FIG. 1C is a front view showing the bracket 31 (a state in which the bracket lid is fitted to the bracket body). 2A is a sectional view taken along line EE shown in FIG. 1A, FIG. 2B is a sectional view taken along line FF shown in FIG. 1B, and FIG. 1C is a cross-sectional view taken along the line LL shown in FIG.
FIG. 3A is a side view of the bracket lid 33 [FIG.
Is viewed from the right or left], and FIG. 3B is a side view of the bracket 31 [view viewed from the right or left in FIG. 1C]. In addition, in FIG. 3B, the archwire 2 is shown by a chain line.

The horizontal view of the bracket body 32 is an ellipse which is slightly longer in the vertical direction. The major axis of the bracket lid 33 is longer than the major axis of the bracket body 32, and the minor axis of the bracket lid 33 is the major axis of the bracket body 32. It is shorter than the short axis of. An archwire insertion groove 37 is provided in the middle of the bracket main body 32 in a substantially horizontal direction, and recesses 34 for fitting are provided on the sidewalls above and below the insertion groove 37. A protrusion 35 is provided inside the side wall of the bracket lid 33 so as to correspond to the recess 34. The bracket lid 33 is made of an elastic metal member, and a notch 36 corresponding to the archwire insertion groove 37 is formed on the side surface of the bracket lid 33. Bracket 31
The surface (in a state where the bracket lid 32 is fitted to the bracket body 32) has a smooth shape with few irregularities.

Next, the orthodontic appliance (bracket) of the first embodiment
The use mode and the fixing mechanism of the arch wire will be described. The bracket body 32 is adhered to the surface of the patient's teeth by the adhesive applied to the adhesive surface 32a.

To attach the archwire 2, the archwire 2 is stored in advance in the archwire insertion groove 37 of the bracket body 32. Then, the bracket lid 33 is pressed from the direction of the arrow G and slightly expanded in the direction of the arrow H by elastic deformation to be deformed into a shape that can be loosely fitted to the bracket main body 32 and then fitted to the bracket main body 32. Then, when the pressing in the direction of arrow G is released, the bracket lid 33 contracts in the direction opposite to the direction of arrow H in order to restore the shape and clamps the bracket body 32 from the width direction.
In addition, although it floats (separates) in the direction opposite to the arrow G direction due to the restoration, it can be strongly held and fixed by the engagement of the concave portion 34 and the convex portion 35 together with the sandwiching in the direction opposite to the arrow H.

The archwire 2 is housed in a space defined by the archwire insertion groove 37 and the inner wall surface of the bracket lid 33 (hereinafter referred to as the archwire insertion space). The size of the arch wire 2 to be used is such that it fits exactly in the correct position correction step. Then, the labial side surface of the rectangular arch wire 2 abuts on the inner wall surface of the bracket lid 33, and the upper side surface, the tooth side surface, and the lower side surface of the arch wire 2 abut on the wall surface of the arch wire insertion groove 37, respectively.
Is fixed. Since the arch wire is firmly fixed in this way, the force applied to the arch wire 2 is correctly transmitted to the bracket 31, and torque movement or the like can be performed.

In the treatment, the thickness and shape of the arch wire are selected according to the degree of fixing strength of the arch wire desired in each treatment process, and the degree of play between the arch wire insertion space and the arch wire is selected. By adjusting it, you can achieve loose fixing to firm fixing. For example, in the rough alignment stage, the arch wire 2 may be round or thin, and the bracket 3
The arch wire 2 is loosely fixed to 1. When it is desired to move the torque in the correct position correcting step, a square-shaped archwire 2 having a size corresponding to the archwire insertion space is used, and the archwire 2 is fitted tightly.

When the bracket lid 33 is to be removed, the bracket lid 33 is pushed in the direction of the arrow G and expanded in the direction of the arrow H in the same manner as described above, and the bracket lid 33 is deformed into a shape that can be loosely fitted into the bracket body 32 and removed. At this time, the engagement between the convex portion 35 and the concave portion 34 is released by the deformation of the bracket lid 33, and the bracket lid 33 is disengaged as described above.

As described above, since the bracket of the first embodiment is constructed so that the outer peripheral shape of the bracket lid 33 can be distorted so as to be attached / detached, a space is not required in the portion for accommodating the archwire upon attachment / detachment. Instead, the bracket lid can be attached and detached, and therefore the archwire can be replaced.

The bracket main body 32 and the bracket lid 33 are not limited to the shapes shown in FIG. 1. For example, the major axis of the elliptical bracket lid is shorter than the major axis of the bracket body, and the minor axis of the bracket lid is It may be longer than the short axis of the bracket body. Further, the direction of the ellipse of the bracket body and the bracket lid is not limited to the one that is long in the vertical direction as described above, but may be an ellipse that is long in the horizontal direction. Further, the short axis of the bracket body may be fitted to the long axis of the bracket lid, and the long axis of the bracket body may be fitted to the short axis of the bracket lid. In addition, one of the bracket body and the bracket lid may be circular and the other may be elliptical. In these cases as well, the longer axis (long axis, short axis, diameter) of the bracket lid is pressed against the bracket body, and the shorter axis is widened with respect to the bracket body, so that the bracket lid becomes the bracket body. Then, the bracket body is clamped and fixed by releasing the above pressure.

<Second Embodiment> Next, a second embodiment of an orthodontic appliance having an arcuate lock pin will be described. FIG.
4A is a front view showing a state in which the arch wire 2 is inserted through the orthodontic bracket 30 including the lock pin 4 and the bracket 31, and FIG. 4B is a sectional view taken along the line JJ. Yes, FIG. 4C is a front view of the lock pin 4. Figure 5
Is a view showing the bracket 31, (a) of FIG. 5 is a front view,
5B is a top view, and FIG. 5C is a cross-sectional view taken along the line KK of FIG. 5A, with the bracket body 32 and the bracket lid 33 removed. . In FIGS. 4 and 5, the same components as those in FIGS.

The lock pin 4 has a rod-like bow shape, and the bracket body 32 is provided with a lock pin insertion passage 38 on the side close to the tooth surface, which is substantially orthogonal to the arch wire insertion groove 37. The lock pin insertion passage 38 has the same or slightly smaller radius of curvature as the arched lock pin 4. The bracket lid 32 has the lock pin insertion passage 3 described above.
8 is provided with a lock pin insertion hole 39. It is preferable that the lower end portion 4a, particularly the tip end thereof, be made slightly thinner so that the lock pin 4 can be easily inserted into the lock pin insertion passage 38.

Next, a method of using the second embodiment and a fixed state of the arch wire 2 will be described. Example 1 described above
In the same manner as described above, the bracket lid 33 is fitted to the bracket body 32 in which the arch wire 2 is inserted, and then the lock pin 4 is inserted into the lock pin insertion hole 39 and the lock pin insertion passage 3.
Passed through 8. In order to prevent the lock pin 4 from coming off spontaneously, it is preferable to bend and use the lock pin lower end 4a after insertion.

By inserting the lock pin 4 into the lock pin insertion passage 38, the arch wire 2 passed through the arch wire insertion passage 37 is pressed and fixed by friction resistance. At this time, the tooth side surface 2a of the arch wire 2 is fixed by the lock pin 4, the upper side surface 2d and the lower side surface 2b of the arch wire 2 are fixed by the inner wall of the arch wire insertion groove 37, and the labial side surface 2c of the remaining arch wire is the bracket lid. Three
It is configured to be fixed on the inner surface of 3.

The upper side surface 2d and the lower side surface 2c of the archwire 2 are in contact with the inner wall of the archwire insertion groove 37 without any deviation, and the labial side surface of the archwire is also in contact with no gap to cause no deviation. Remaining one side (arch wire 2
With respect to the tooth side surface 2a), even if the lock pin 4 moves up and down a little, the pressing force of the inner surface of the lock pin 4 does not change, so that the arch wire 2 does not shift. The fixing is firmly fixed by pressing as described below. That is, the bow-shaped outer surface (tooth surface side) of the lock pin 4 is supported by the lock-pin insertion passage 38, and the arch wire 2 is pressed toward the labial side by the bow-shaped inner surface of the lock pin 4, and the arch wire 2 holds its lip. Bracket lid 3 on the side 2c
It is pressed against the inner wall surface of No. 3. In this way, since the archwire 2 is strongly fixed to the bracket 30, as a result, even if a force is applied to the archwire 2 by mastication or the like, the torque can be moved as designed, and the archwire can be moved. You can also stop the lateral movement of. Further, since the lock pin has an arcuate shape, the arch wire 2 can be fixed more firmly than in the first embodiment, as described in detail below.

FIG. 6 is an enlarged sectional view showing the vicinity of the arch wire of FIG. 4 (b). Since the lock pin 4 and the lock pin insertion passage 38 of the present invention have an arcuate shape, the rectangular arch wire 2 is pressed at both corners of the tooth side surface 2a, that is, at two points α and β shown in FIG. . Considering the case of a straight lock pin, the arch wire 2 should be connected to the tooth flank 2
a It will be pressed from the entire surface, but it will be 1
It is equivalent to pressing at the point, and the archwire 2 can be pressed more firmly when pressing at two points as in the present invention. Since the lock pin 4 is firmly fixed as described above and does not easily come out, it is possible to use the lower end portion 4a without bending it in some cases.

Further, the lock pin insertion passage 38 provided in the bracket main body 32 has an arc shape which is the same as the lock pin 4 or slightly smaller than the radius of curvature in conformity with the lock pin 4. If the radius of curvature is set to a slightly smaller value, the tip of the lock pin will be inserted while being guided by the arcuate outer surface side of the lock pin insertion passage when the lock pin is inserted, so that the tip of the lock pin is caught in the corner of the arch wire. Since the insertion failure does not float, the treatment by the dentist can be performed more smoothly.

In the treatment, as described above, the thickness and shape of the arch wire 2 and the thickness of the lock pin 4 are variously selected to realize the loose fixing to the firm fixing. For example, if the thickness of the arch wire 2 and the lock pin 4 is sufficiently thick with respect to the arch wire insertion space,
The arch wire 2 can be firmly fixed to the bracket 3, and if the arch wire 2 is thin, it can be played and is loosely fixed.

Conventionally, the ligation strength of the mounting wire is adjusted and the degree of fixation of the archwire 2 is adjusted according to the doctor's intuition, which often depends on the skill of the doctor.
In the second embodiment, the fixing strength is automatically set by selecting the thickness of the archwire 2 and the lock pin 4, so that a certain fixing strength can be realized regardless of the skill of the doctor.

The lower end portion 4a of the lock pin 4 is bent so as not to come off, but it is inevitable that a slight gap (refer to the portion indicated by the arrow A in FIG. 4B) is formed at the bent portion. . Even when the lock pin 4 is vertically displaced by the amount of this gap, the lock pin 4 can continue to hold the archwire 2 as described below. That is, the portion C that was pressed at the beginning of the lock pin 4 (see FIG. 4B)
However, even if it shifts to the lower end side by the amount of the above-mentioned gap, it will only be pressed by the new portion D, and its thickness does not change, so the force that presses the archwire 2 before and after shifting Does not change. Therefore, the archwire 2 is not loosely fixed, and the torque can be moved.

The insertion passage 38 for the lock pin is not limited to the one having the same curvature as the lock pin 4, and may have a radius of curvature slightly smaller than the radius of curvature of the lock pin 4 (that is, a sharp curved curve). When the lock pin 4 is inserted, the lock pin 4 is inserted while hitting the tooth side wall surface of the lock pin insertion passage 38, so that the lock pin 4 is easily inserted.

Next, the sectional shape of the lock pin 4 will be described. The width of the lock pin 4 in the lateral direction (width W ₄ shown in FIG. 4C) was adapted to the width of the lock pin insertion passage 38 (width W ₈ shown in FIG. 5) at all treatment stages. It is recommended to keep the width slightly smaller. By doing so, the lock pin 4 has the right and left lateral sides on both sides of the lock pin insertion passage 3
8 Since it contacts the side wall, there is no rattling in the lateral direction.

On the other hand, the depth of the lock pin 4 (width V ₄ shown in FIG. ₄ ) depends on each stage of treatment as described above.
Used as thin width V ₄ when the desire gentle fixation, firmly want the archwire 2 and fixed using those width V ₄ is thick. That is, the cross-sectional shape of the lock pin 4 is a thin elliptical shape having a long lateral width W _{4 in the case} of loose fixation, and gradually becomes a more elliptical shape or a circular shape if stronger fixation is desired. Depth width V
_An elliptical lock pin 4 which is long in _four directions is used.

Further, it is recommended that the cross-sectional shapes of the lock pin 4 and the lock pin insertion passage 38 are polygonal. In the case of a circular cross section, the lock pin 4 may rotate around the center of the circle, but by making it polygonal, even if a rotational force is applied to the lock pin 4, the lock pin 4 contacts the inner wall of the lock pin insertion passage 38. Since it does not rotate, it can be fixed stably without moving.

FIG. 7 is a cross-sectional view showing a cross-sectional shape of the lock pin 4 and the lock pin insertion passage 38, and a portion corresponding to the vicinity of the lock pin 4 in the cross section taken along the line S--S shown in FIG. Represents

The most recommended cross-sectional shape of the lock pin 4 is a pentagon (see FIG. 7). In the case of a pentagon, the lock pin 4 is provided on the tooth side inner wall of the lock pin insertion passage 38.
Tooth side surface 4a of the tooth contact, and a diagonal corner portion γ of the tooth side surface 4a contacts the archwire 2. As described above, on the tooth side of the lock pin 4, the surface 4a contacting the tooth side and / or the surfaces on both sides thereof contact the inner wall of the rectangular lock pin insertion passage 38 to block the rotation of the lock pin 4. Act on. On the other hand, on the labial side (archwire side) of the lock pin 4, since the archwire 2 is pressed by the corner portion γ, the archwire 2 can be firmly fixed as compared with the case of pressing by the surface. In addition, the bending direction when bending the lock pin lower end portion 4a is determined to be four directions in the case of a quadrangular cross section, and is limited to two directions on the long side in the case of a rectangle, which is inconvenient during treatment. However, in the case of a pentagon, the bending direction is relatively unrestricted, so the usability is good. On the other hand, heptagon,
In the case of an octagon and a polygon with a large number of corners, it is close to a circle,
It becomes difficult to prevent the rotation of the lock pin 4. Therefore, a pentagonal cross section is most recommended.

Also, in the case where the lock pin 4 has a semicircular cross section, the surface of the lock pin 4 abuts the inner wall of the lock pin insertion passage 38 to block the rotation of the lock pin 4 in the same manner as described above. The arch wire 2 can be firmly fixed at the circular vertex, which is a preferable shape.

[0044]

As described above, the orthodontic appliance according to the present invention is
Even though the surface has a smooth shape with no irregularities, the archwire can be fitted from the front of the tooth, and various kinds of thickness and shape of the archwire can be selected to realize various types of loose fixing to firm fixing. Therefore, the orthodontic bracket of the present invention can be applied to all treatment stages from the rough alignment stage to the right position correction stage, and therefore plaque is less likely to adhere and the toothbrush can easily reach when brushing teeth, so cleaning can be performed easily. You can

Further, by using an arched lock pin and inserting it through the bracket to fix the arch wire, it is possible to realize a stronger fixation of the arch wire. In this case as well, by selecting the thickness of the lock pin and the thickness and shape of the archwire variously, from the above-mentioned, it is possible to realize various types from loose fixation to firm fixation, and it is possible to deal with all the treatment stages and the surface. Since it has a smooth shape with relatively few irregularities, it is less likely to have plaque and the toothpaste can be easily cleaned.

[Brief description of drawings]

FIG. 1 is a front view showing an orthodontic bracket (bracket) according to the first embodiment of the present invention.

FIG. 2 is a sectional view showing an orthodontic device (bracket) according to the first embodiment of the present invention.

FIG. 3A is a side view of a bracket lid, and FIG. 3B is a side view of the bracket.

4A is a front view showing an orthodontic appliance and an arch wire according to Embodiment 2 of the present invention, FIG. 4B is a sectional view taken along the line JJ, and FIG. 4C is a front view of a lock pin. Fig.

FIG. 5 is a diagram showing a bracket according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view showing the vicinity of the arch wire of FIG. 4 (b).

FIG. 7 is a cross-sectional view showing an example of a lock pin and a lock pin insertion passage according to the present invention.

FIG. 8 is a view showing a conventional orthodontic bracket.

FIG. 9 is a perspective view showing a conventional orthodontic bracket.

[Explanation of symbols]

 2 arch wire 2a tooth side surface 2b bottom side surface 2c labial side surface 2d upper side surface 30 orthodontic appliance 31 bracket

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] December 5, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

Alternatively, the bracket lid is made of an elastic material, and one of the bracket lid and the bracket main body is circular and the other is elliptical, and the major axis of the elliptical bracket lid is The minor axis of the elliptical bracket lid that is longer than the diameter of the circular bracket body is shorter than the diameter of the circular bracket body, or
Alternatively, the gist of the circular bracket lid is that the diameter is shorter than the major axis and longer than the minor axis of the elliptical bracket body.

Claims (3)

[Claims] 1. An orthodontic bracket including a bracket main body fixed to a tooth surface, and a bracket lid covering the bracket main body so as to cover the bracket main body. The bracket lid is made of an elastic material. In addition, the bracket lid and the bracket body are both elliptical, and one of the long axis and the short axis of the bracket lid is
An orthodontic appliance characterized in that it is longer than either the long axis or the short axis of the bracket body, and the other of the long axis or the short axis of the bracket lid is shorter than the other of the long axis or the short axis of the bracket body. Ingredient 2. An orthodontic bracket comprising a bracket main body fixed to a tooth surface and a bracket lid covering the bracket main body so as to cover the bracket main body, wherein the bracket lid is made of an elastic material. In addition, one of the bracket lid and the bracket body is circular and the other is elliptical, and the major axis of the elliptical bracket lid is longer than the diameter of the circular bracket body and the elliptical The minor axis of the bracket lid is shorter than the diameter of the circular bracket body, or the diameter of the circular bracket lid is longer than the major axis of the elliptical bracket body and shorter than the minor axis. Orthodontics. 3. The orthodontic bracket includes a bracket and a lock pin for positioning the arch wire on the bracket, and the bracket main body is provided with an arch wire insertion groove and a lock pin insertion passage. The orthodontic appliance according to claim 1 or 2, wherein the lock pin is arcuate, and the insertion path for the lock pin is arcuate having the same or a slightly smaller radius of curvature than the lock pin.