WO2013141627A1

WO2013141627A1 - Instrument for drawing out abutment of implant

Info

Publication number: WO2013141627A1
Application number: PCT/KR2013/002351
Authority: WO
Inventors: 김형우
Original assignee: Kim Hyeong Woo
Priority date: 2012-03-21
Filing date: 2013-03-21
Publication date: 2013-09-26
Also published as: KR101309417B1

Abstract

The present invention comprises: grip portions which are gripped by the hand of a user and are crossed around a hinge portion when an external force is applied; and unit holding portions which are extended at the opposite ends of the grip portions around the hinge portion and interlock the crossing of the grip portions. The unit holding portions comprise: arm portions which extend at a predetermined length from the grip portions so as to vertically and horizontally bend in accordance with an oral structure; and drawing portions, which are formed at the ends of the arm portions, comprising an inclined pressurization plane having an acute angle for encompassing the outer circumference of a conical shape of an exposure inclined portion of an abutment at both sides so as to compress the same.

Description

Implant Abutment Mechanism

The present invention relates to a take-out mechanism for separating the abutment coupled with the fixture of the implant from the fixture, and more specifically, using an abutment or friction force coupled to the fixture by using the elastic force of the elastic body rather than the skew type. When separating the abutment of the coupling method from the fixture, the grip part which cross-moves around the hinge part when the external force is wrapped around the hand and extends on the opposite end of the grip part about the hinge part is extended to the grip part. The abutment take-out mechanism consisting of the unit holding part that interlocks with the cross motion makes it easier, more convenient, and can be used to separate the abutment from the fixture with weak force.It is convenient to use, and it is safe because it does not damage the implant and the surrounding teeth. Easily withdraw abutments from fixtures without rotation Therefore, it relates to an abutment ejection mechanism that can shorten the procedure time.

Artificial teeth are artificially created to be almost identical in appearance and function to natural teeth of humans, and are used to replace natural teeth when they are defective by various factors.

1 is a cross sectional view of a conventional implant unit. Referring to FIG. 1, a conventional implant unit includes a fixture 10 fixed to an alveolar bone, an abutment 20 which is screwed to the fixture and functions as a support for mounting an artificial tooth. It was common to consist of a screw 30 that securely holds the butt to the fixture.

In this case, the fixture 10 is directly embedded in the alveolar bone (jawbone) 2 in the gum 1 to perform a kind of pillar, and the thread is formed on the outer surface of the body to be screwed to the alveolar bone 2, the fixture 10 At the top of the body is formed a hexagonal head. And, the hexagonal head is formed with a fastening hole in the center to follow the longitudinal direction of the body.

In addition, the abutment 20 serves as a support for mounting the artificial tooth 3, the screw has a head formed with a straight or cross-shaped driver seat groove or a hexagon wrench seat groove, the body under the head The thread is formed. Then, the artificial abutment (3) is put on the abutment (20) and combined to replace the damaged permanent tooth of the patient with an artificial tooth.

However, when the abutment 20 is coupled to the fixture 10 by screwing as described above, the rigidity of the coupling may be strengthened, but the fastening state is accumulated while the micro vibration generated by the continuous load in the oral cavity is accumulated. There is a risk of loosening, it is necessary to repeatedly rotate the screw during the procedure, there is a problem that there is always a risk of damage to the alveolar bone weakened by the force applied for this repeated rotation.

Accordingly, in order to solve the shortcomings of the screw coupling type implant unit, a hook coupling type implant unit using elastic force of an elastic body has been disclosed in Korean Patent Registration No. 668368 (2007.01.08) and Application No. 10-2010-0059743. In addition, an implant unit having a coupling method by frictional force is used. The hook coupling type implant unit here is made of a shape memory alloy of the fastening legs of the abutment, the same number of fastening grooves of the fastening legs and fixtures to take a one-to-one correspondence, thereby inserting the abutment into the shaft hole Then, it rotates counterclockwise or clockwise so that the fastening leg can be inserted into or detached from the fastening groove.

However, the hook fastening method disclosed in the above-mentioned Patent No. 668368 also reduces the number of rotations required to couple the abutment to the fixture. However, rotation is necessary to fit or take out the fastening leg into the fastening groove. .

Therefore, when the fixture is placed, the abutment is tightened, the prosthesis is bonded, and there is a problem with the implant, or when you want to remove the abutment from the fixture for other reasons, such as a regular checkup, the prosthesis is in close contact with the adjacent teeth. Since the rotation is virtually impossible because it is attached, there was a problem that the removal of the implant unit is impossible.

In order to solve this drawback, the hook fastening method disclosed in Publication No. 10-2011-0139577 that does not require rotation and the fastening method using an elastic body such as Application No. 10-2007-0051635 have been proposed, but these fastening methods are used to separate the abutment. At this time, a larger force is required than the fastening force joining the fixture and the abutment, where the fastening force of the fixture and the abutment must be strong enough to resist the various forces to release the abutment from the fixture at the time of authoring. Therefore, in order to separate the fixture and abutment combined with such a strong fastening force in a general manner, a very strong force is required. With such a strong force, the abutment body 410 located on the upper part of the fixture is held by the fixture. If you try to separate it, you can't use it because of too strong abutment, fixture, alveolar bone It is probable damage, but also caused a problem that is almost impossible to apply a force in the direction of the preferred orientation is vertical. And there is a problem that the force applied in the upper direction to the abutment is very large.

The frictional force method also has the same problem.

An object of the present invention devised to solve the problems of the prior art is to separate the abutment coupled by the fastening method or frictional force using the elasticity of the elastic body to the fixture, when the external force is wrapped around the hand, the center of the hinge The abutment take-out mechanism consisting of a grip part which is cross-moved by a cross and a unit holding part which is formed at the opposite end of the grip part about the hinge part and interlocks with the cross motion of the grip part can be separated more easily and conveniently. It is convenient to use, it is safe because it does not damage the implant and surrounding teeth, and the abutment can be separated from the fixture without applying strong force in the oral cavity. Can be separated from the fixture and the abut without rotation It is possible to easily take out the bit has an abutment taking-out equipment capable of shortening the treatment time to provide.

An object of the present invention, when the user is wrapped in the hand while applying an external force, the grip portion that is cross-movement around the hinge portion; And a unit holding part extending at an opposite end of the grip part around the hinge part to interlock with the cross motion of the grip part, wherein the unit holding part extends a predetermined length from the grip part to be bent vertically and horizontally according to the oral structure. It can be achieved through the abutment taking-out mechanism, characterized in that the arm portion and the discharging portion having an inclined pressing surface for wrapping and pressing the outer diameter of the cone-shaped exposed inclined portion of the abutment on both sides at the end of the arm portion. .

At this time, the inclined pressing surface 331 preferably has an acute angle and is efficient.

In addition, the hinge portion may be hinged so as to intersect two bodies constituting the grip portion, and a play supporting jaw for limiting the rotation angle of the grip portion is provided to prevent the inclined pressing surface of the unit holding portion from abutting each other. .

In addition, the inclination angle of the inclined pressing surface of the extraction portion is preferably equal to or greater than the inclination angle formed between the outer peripheral surface of the exposed inclined portion of the abutment body and the fixture (fixed body) top surface.

In addition, the vertical bending portion and the horizontal bending portion may be manufactured in various forms.

For example, the vertical and horizontal bends may take the form of steps.

The present invention is to separate the abutment coupled by the fastening method or the frictional force method using the elastic force of the elastic body to the fixture, when the grip is applied by the external force while wrapping around the hinge, the grip portion and the hinge portion centered around the hinge portion, The abutment take-out mechanism, which is formed on the opposite end of the grip part and is interlocked with the cross-movement of the grip part, makes it easier and more convenient to separate the abutment, which is convenient to use and damages the implant and surrounding teeth. It is not coated and has a safe effect. In addition, the wedge effect is easy to separate the abutment with a very small force even a teacher with a weak arm.

In addition, the present invention has the effect of shortening the procedure time because it can be easily taken out without rotation when taking out the abutment.

1 is a cross sectional view of a conventional implant unit;

2 is a perspective view of the abutment taking-out mechanism according to the present invention;

3 is a perspective view showing that the abutment is taken out using the abutment taking-out mechanism according to the present invention;

4 to 6 are process charts showing a process of taking out abutments from a fixture using an abutment take-out mechanism according to the present invention;

7 to 9 are views for explaining various modifications of the abutment take-out mechanism according to the present invention.

10 to 12 are views for explaining various modifications of the vertical bending portion and the horizontal bending portion of the abutment take-out mechanism according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. The following examples are only presented to understand the content of the present invention, and those skilled in the art will be capable of many modifications within the technical spirit of the present invention. Therefore, the scope of the present invention should not be construed as limited to these embodiments.

2 is a perspective view of the abutment taking-out mechanism according to the present invention, and FIG. 3 is a perspective view illustrating taking out the abutment using the abutment taking-out mechanism according to the present invention.

2 and 3, the abutment take-out mechanism 10 according to the present invention, when the user wraps with a hand and applies an external force, the grip portion 100 and the movement of the cross portion around the hinge portion 200 and the A unit holding part 300 is formed extending from the opposite end of the grip part 100 about the hinge part 200 so as to be interlocked with the cross motion of the grip part 100.

At this time, the unit holding portion 300 extends a predetermined length from the grip portion 100 is bent in the vertical and horizontal direction in accordance with the oral structure and the arm portion 310, the abutment (a) at the end of the arm portion (310) It is composed of a take-out portion 330 is provided with an inclined pressing surface 331 for wrapping and pressing the outer diameter of the cone-shaped exposed inclined portion 430 of both sides.

At this time, the inclined pressing surface 331 preferably forms an acute angle.

In this case, the arm portion 310 may form a vertical bending portion 311 and a horizontal bending portion 313, the vertical bending portion 311 may be formed to approximately the average height of the teeth, the horizontal bending The portion 313 is bent in the horizontal direction toward the tooth side from the end of the vertical bent portion 311, the bent shape may have a variety of shapes. For example, the vertical bent portion and the horizontal bent portion may be formed stepwise (FIGS. 10 to 12).

In addition, the hinge portion 200 is hinged so as to cross the two bodies constituting the grip portion 100, the inclined pressing surface 331 of the unit holding portion 300 to prevent the mutual contact of the grip portion 100 Spacing support jaw 220 for limiting the rotation angle may be provided.

In addition, the inclination angle A of the inclination angle A of the inclined pressing surface 331 of the extraction unit 330 is formed by the outer circumferential surface of the exposed inclined portion 430 of the abutment 400 and the upper surface 550 of the fixture. It is more effective to form larger than or equal to (B).

In addition, forming the inclined pressing surface 331 and the hinge portion 200 in parallel has an effect that the operator can easily position when the inclined pressing surface of the take-out mechanism to the exposed inclined portion of the abutment.

Hereinafter, a hook-coupled implant unit structure according to the present invention will be described with reference to FIGS. 3 to 6.

The hook-type implant unit is a fixture (500) that is directly embedded in the alveolar bone to perform the role of a pillar, an abutment (axially coupled to the upper end of the fixture and serves as a support on which artificial teeth are mounted) 400).

At this time, the fixture 500 is a screw thread is formed on the outer surface to be screwed to the alveolar bone, the upper end is formed with a guide hole 510 extending downward along the axial direction.

The abutment 400 protrudes upward in a state in which it is coupled to a fixture, and a body 410 to which an artificial tooth is coupled, and an insertion portion formed downward in the axial direction from the body and inserted into a guide hole of the fixture. 420. The lower portion of the body further includes an exposed inclined portion 430 formed of an oblique inclined surface while being exposed to the upper portion of the fixture.

At this time, the insertion portion 420 may be formed of a rotation preventing portion made of a polygon to prevent unnecessary rotation of the abutment in the state of being fitted in the guide hole 510 of the fixture, it is fitted by being coupled by the external force It is composed of the inclined outer hook fastening portion 422 to be separated by the external force pulling from the outside.

In addition, since the insertion part 420 is divided into pieces by a plurality of cutting grooves in the axial direction, when inserted into the guide hole 510, the insertion part 420 is pressed by the inner wall and passed through the guide hole in a closed state. The hook is restored to its original form.

In addition, the guide hole 510 is formed in a polygonal shape corresponding to the anti-rotation portion to prevent the rotation of the abutment and forming a coupling passage to which the annular hook pin is fitted, It may be composed of a hook pin guide portion formed with an inclined inner hook fastening portion 520 to prevent separation of the annular hook pin.

Accordingly, the anti-rotation guide part is seated on the anti-rotation part of the abutment, and the hook pin guide part is fitted with an annular hook pin of the abutment and the inclined outer hook fastening part 422 has an inner hook fastening part ( 520) to maintain a firm coupling state.

The implant unit is fastened by simply inserting the abutment without rotating the abutment while the inclined surface of the outer hook fastening portion 422 is caught on the inclined surface of the inner hook fastening portion 520, and the abutment is Even when taking out 400, the outer hook fastening portion 422 is pulled over the inclined surface of the inner hook fastening portion 520 just by pulling upward to provide a structure that can be separated without rotation.

In this case, the grip part 100, the unit holding part 300, and the hinge part 200 combine two bodies formed integrally with each other by crossing the hinge part 200 with each other to surround the grip part 100. The unit holding parts 300 formed at the end of the body are narrowed in the direction facing each other by the pressure applied to the grip, and configured to apply an external force to the abutment 400 positioned therebetween.

The grip part 100 may be composed of two bodies formed of a curved surface of which the outer circumferential surface of the palm contact is rounded so as to minimize the stimulus transmitted to the user's hand applying the force in the wrapped state.

4 to 6 is a process chart showing a process of taking out the abutment using the abutment taking-out mechanism according to the present invention.

First, the fixture 500 is embedded in the alveolar bone, the abutment 400 is slidingly coupled to the upper portion by the annular hook pin, and the abutment ( In order to extract 400, the exposure inclination unit 430 is exposed to the outside.

However, of course, the artificial tooth may be removed depending on the purpose of taking out the abutment.

Next, the exposure inclined portion 430 is positioned between the ejection portion 330 of the abutment ejection mechanism 10, and then the grip portion 100 is pressed little by little so that the inclined surface of the inclined pressing surface 331 is To face the inclined surface of the exposure inclined portion 430.

At this time, the vertical bent portion 311 of the arm portion 310 is formed to approximately the average height of the teeth, and the horizontal bent portion 313 is formed by bending horizontally from the end of the vertical bent portion 311 toward the tooth side. In addition, the inclined pressing surface 331 is formed at the end thereof, whereby the ejection position can be selected easily and accurately. At this time, the vertical bent portion and the horizontal bent portion 313 is possible in a variety of forms and stepped (steps 10 to 12) to easily access the abutment exposure inclined portion 430 in the state that the artificial teeth are mounted. Can be formed.

That is, the vertical bending portion 311 of the arm portion is first bent at an obtuse angle larger than 90 ° or 90 ° as shown in FIG. 10, and then configured to be secondarily bent again near the inclined pressing surface. It may be configured to form a stepped form.

In addition, as shown in FIG. 11, the horizontal bending portion 313 of the arm portion is firstly bent while forming an obtuse angle greater than 90 ° or 90 ° in a direction facing each other at the ends of the vertical bending part 311. It may be configured to be second bent again towards the tooth side to form a stepped shape as a whole.

Accordingly, the arm portion is bent at 90 ° and bent at 90 ° to form a stepped vertical bend at 90 °. It may be formed by forming a horizontal bent in a stepped shape while forming an obtuse angle greater than 90 ° to the part.

In addition, the arm portion is bent at an obtuse angle greater than 90 ° while being bent at 90 ° to the vertical bending portion forming a stepped shape may be formed by forming a horizontal bend forming a stepped shape, as shown in Figure 12, 90 It is bent at an obtuse angle larger than ° and bent at an obtuse angle larger than 90 ° to form a stepped horizontal bent portion is formed in a variety of forms such as stepped bent at an oblique angle greater than 90 °.

Thereafter, the inclined surface of the inclined pressing surface 331 is brought into contact with the inclined surface of the exposed inclined portion 430, and then the grip unit 100 is pressed to gradually close the distance between the inclined pressing surfaces, thereby inclining the inclined surface of the inclined pressing surface 331. The external force transmitted in the horizontal direction to the inclined surface of the exposure inclination portion 430 through the upper edge is increased.

Then, the upper edge of the inclined surface of the inclined pressing surface 331 by the external force transmitted in the horizontal direction to the inclined surface of the exposed inclined portion 430 generates a force to slide down along the inclined surface of the exposed inclined portion 430 As described above, the abutment 400 receives the force directed in the vertical direction as shown by the arrow shown in FIG.

Accordingly, the abutment 400 is moved upward by the force directed in the vertical direction, and the outer hook fastening portion 422 that has been caught by the inner hook fastening portion 520 of the guide hole is compressed.

The annular hook pin entering the inside of the guide hole by the pressing of the outer hook fastening portion is crimped and compressed, and at this time, the outer hook fastening portion 422 has to ride over the obliquely inclined inner hook fastening portion 520. The external force to be applied through the grip part pressing step may be slightly large, but since the guide hole 510 having the same width is moved in the compressed state, the external force can be easily moved even with a small external force.

In addition, after the outer hook fastening portion 422 has passed over the inner hook fastening portion 520, the user may apply a force in a direction to be ejected to take out more quickly.

Then, when the guide hole 510 is moved away from the guide hole 510 in the state in which the outer hook fastening portion 422 is compressed, as illustrated in FIG. 6, the inner hook of the guide hole 510 is compressed. As the outer hook fastening portion 422 is restored to its original form, the abutment is completely separated from the fixture.

7 to 9 are views for explaining various modifications of the abutment take-out mechanism according to the present invention. This modification of the ejection mechanism is for improving the ejection efficiency in response to the shape of the exposed inclined portion 430 of the abutment 400.

Referring to FIG. 7, the exposed inclined portion 430 of the abutment 400 is formed of an oblique inclined surface formed at the bottom of the body, and the upper portion of the insertion portion 420 provided in the abutment 400. Is configured to expose a predetermined length to the upper portion of the fixture 500, the take-out portion 330 provided in the unit holding portion 300 is made of an inclined surface having a larger inclination than the inclined surface of the upper portion forming the exposed inclined portion 430 The lower portion is configured to include an inclined pressing surface 331-2 vertically formed along the shape of the insertion portion 420 exposed to the upper portion of the fixture 500. In this case, the exposed inclined portion 430 is preferably configured to protrude outward from the body provided in the abutment 400 so as to increase the area in contact with the inclined pressing surface 331-2. Do.

Accordingly, the inclined pressure is applied by an external force applied from the side in the state where the upper end of the inclined pressing surface 331-2 having the larger inclined surface is partially in contact with the lower portion of the inclined surface of the exposed inclined portion 430 made of the inclined surface. An inclined surface of the surface 331-2 exerts downward force along the inclined surface of the exposed inclined portion 430 and the inner hook coupling portion of the abutment 400 to the outer hook coupling portion 422 of the fixture 500. It is separated out from 520. At this time, since the lower portion of the inclined pressing surface 331-2 is vertically formed, the inclined surface of the exposed inclined portion 430 until the vertical surface of the inclined pressing surface 331-2 contacts the insertion part 420. Continue to press B).

Referring to FIG. 8, the exposed inclined portion 430 of the abutment 400 is formed of an oblique inclined surface formed at the bottom of the body, and the upper portion of the insertion portion 420 provided in the abutment 400. Is formed as an inclined surface having an angle that extends from the end of the exposed inclined portion 430 is configured to expose a predetermined length to the upper portion of the fixture 500, the extraction portion 330 provided in the unit holding portion 300 has an upper portion The inclined surface having a larger inclination than the inclined surface constituting the exposed inclined portion 430, the lower portion is an inclined surface having an angle that extends downward along the inclined surface of the insertion portion 420 exposed to the upper portion of the fixture 500. It is configured to include the formed inclined pressing surface 331-3. In this case, the exposed inclined portion 430 is preferably configured to protrude outward from the body provided in the abutment 400 so as to increase the area in contact with the inclined pressing surface 331-2. Do.

Accordingly, the inclined pressure is applied by an external force applied from the side surface in a state in which the upper end of the inclined pressing surface 331-3 made of a larger inclined surface is partially in contact with the lower portion of the inclined surface of the exposed inclined portion 430 made of a gentle inclined surface. The inclined surface of the surface 331-3 exerts downward force along the inclined surface of the exposed inclined portion 430 and the inner hook coupling portion 422 of the outer hook fastening portion 422 of the abutment 400. It is separated out from 520. At this time, since the lower portion of the inclined pressing surface 331-3 is formed as an inclined surface corresponding to the inclined surface of the insertion portion 420 exposed to the outside of the fixture 500, the inclined surface of the inclined pressing surface 331-3 is The inclined surface of the exposed inclined portion 430 is continuously pressed until the inclined surface of the insertion portion 420 is in contact with the inclined surface.

Referring to FIG. 9, the upper portion of the exposed inclined portion 430 and the insertion portion 420 is formed to be concave, which is the same as that of FIG. 8, but the exposed inclined portion 430 is moved out of the body. There is a difference that is not exposed. Therefore, the takeout part 330 provided in the unit holding part 300 is formed of an inclined surface having a larger inclination than the inclined surface of which the upper portion forms the exposed inclined portion, as shown in FIG. 8, and the lower portion is an upper portion of the fixture 500. It is configured to include an inclined pressing surface (331-4) formed of an inclined surface having an angle spreading downward along the inclined surface of the insertion portion 420 exposed to. At this time, there is an angle difference between the inclined surface formed on the inclined pressing surface 331-4, but other configurations and operations are the same as in the case of FIG.

As described above, the intake portion 330 provided in the abutment ejection mechanism has an angle equal to or greater than the inclined surface of the exposed inclined portion 430 provided in the abutment 400, so that only the upper corner is provided. The inclined pressing surfaces 331-2, 331-3, and 331-4 formed of the inclined surfaces which are in contact with each other, and the inclined pressing surfaces 331-2, 331-3, and 331-4 which are open to the inclined surface. Just by pressing the grip part 100 after being in close contact with the part 430, the external force applied in the horizontal direction is converted into a vertical force along the inclined surface of the exposure inclination part 430 and acts without rotation. The piece 400 can be safely and easily taken out from the fixture 500. In addition, the abutment 400 taken out from the fixture 500 is not directly exerted with a large external force, so that damage such as an annular hook pin or an outer hook fastening part does not occur, so that it can be used by sliding again after taking out. .

In this case, the abutment can be separated if the ejection mechanism inclined pressing surface 331 has a predetermined thickness even if the angle is smaller than that of the exposed inclined portion 430. Not easy to position

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. For example, those skilled in the art can change the material, size, etc. of each component according to the application field, or combine or replace the embodiments in a form that is not clearly disclosed in the embodiments of the present invention, this is also the present invention It will not go beyond the scope of the. Therefore, the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and such modified embodiments should be included in the technical spirit described in the claims of the present invention.

Claims

When the user wraps with a hand to apply an external force, the grip portion 100 which cross-moves around the hinge portion 200; And a unit holding part 300 extending at an opposite end of the grip part 100 about the hinge part 200 so as to be interlocked with the cross motion of the grip part 100.

The unit holding part 300 extends a predetermined length from the grip part 100 to be bent in the vertical and horizontal directions according to the oral structure, and the abutment 400 at the end of the arm part 310. Abutment take-out mechanism, characterized in that consisting of the take-out portion 330 having an inclined pressing surface 331 to wrap and compress the outer diameter of the inclined exposed portion 430 of the cone.
The method of claim 1,

The hinge part 200 is hinged to intersect two bodies constituting the grip part 100, and an angle of rotation of the grip part 100 to prevent the inclined pressing surface 331 of the unit holding part 300 from touching each other. Abutment take-out mechanism, characterized in that the clearance supporting jaw 220 is provided to limit.
The method of claim 1,

Abutment take-out mechanism, characterized in that the inclination angle of the inclined pressing surface 331 of the outlet portion 330 forms an acute angle.
The method of claim 1,

Forming an inclination angle A of the inclined pressing surface 331 of the outlet portion 330 is greater than or equal to the inclination angle B of the outer circumferential surface of the exposed inclined portion 430 of the abutment 400 Abutment take-out mechanism characterized by the above-mentioned.
The method of claim 1,

Abutment take-out mechanism, characterized in that the inclined pressing surface 331 and the hinge portion 200 of the outlet portion 330 is formed in parallel.
The method of claim 1,

The arm portion 310 is composed of a vertical bending portion 311 and a horizontal bending portion 313, the vertical bending portion 311 is formed to the average height of the teeth, the horizontal bending portion 313 is vertical bending Is bent horizontally toward the tooth side at the end of the portion 311;

The vertical bending portion 311 is first bent to form an obtuse angle greater than 90 ° or 90 °, then abutment take-out mechanism characterized in that it is bent again in the vicinity of the inclined pressing surface to form a stepped form.
The method of claim 1,

The arm portion 310 is composed of a vertical bending portion 311 and a horizontal bending portion 313, the vertical bending portion 311 is formed to the average height of the teeth, the horizontal bending portion 313 is vertical bending Is bent horizontally toward the tooth side at the end of the portion 311;

The horizontal bent portion 313 is first bent while forming an obtuse angle greater than 90 ° or greater than 90 ° in the direction facing each other at the ends of the vertical bent portion 311, and then bent again to the side of the tooth to form a stepped shape. Abutment take-out mechanism, characterized in that configured to achieve.