KR100977908B1

KR100977908B1 - Fixture inserted into an implant stent using for accurate guide

Info

Publication number: KR100977908B1
Application number: KR1020080112298A
Authority: KR
Inventors: 이태경; 정제교
Original assignee: 이태경
Priority date: 2008-11-12
Filing date: 2008-11-12
Publication date: 2010-08-24
Also published as: WO2010056052A3; WO2010056052A2; KR20100053261A

Abstract

The fixture of the implant stent according to the invention, the base in contact with the gingival of the subject, a pillar extending over the base, the base formed on the top of the pillar and the cap fastening portion formed on the outer peripheral surface and the male thread is formed on the outer peripheral surface Including, but not limited to, the anchor bushing having a through-hole formed therein along its longitudinal direction, the body portion having a cylindrical body, a head portion formed at one end of the body portion and a screw portion extending from the other end of the body portion, and the anchor bushing A fixing screw inserted into the through hole of the fixing screw; And a cylindrical body, the lower surface of which is formed a hole of a non-perforated circular cross section for accommodating the head of the fixing screw, and the inner circumferential surface of the hole has a female threaded portion screwed with the male threaded portion of the anchor bushing; It is made, including.

Implant Stents, Fixtures, Anchor Bushings, Fixing Screws, Fixing Bases

Description

Fixture inserted into an implant stent using for accurate guide}

The present invention relates to a stent fixture for implants for precision induction, in particular in the case of a patient with significant or edentulous teeth to ensure that the implant stent can be more stably fixed in the mouth of the subject of the implant stent of the implant It relates to a fixture of the implant stent to help guide the implantation more precisely.

Implant is a prosthesis used to replace a badly damaged tooth. An artificial tooth root made of a special metal (usually titanium or titanium alloy) is implanted in the jaw bone and fixed by tangling with the bone. By using artificial teeth to form a general dental method that allows you to live a daily life with a sense almost the same as your own teeth.

Compared to the method using a denture, a bridge, etc., such an implant has a long life and is very similar to a natural tooth, without damaging the surrounding teeth except for the tooth that requires the procedure. It is a procedure.

Implant is a prosthesis used to replace a badly damaged tooth. An artificial root made of a special metal (usually titanium or titanium alloy) is implanted in the alveolar bone and entangled with the alveolar bone tissue. By using the artificial teeth to form a dental treatment method that allows you to live a daily life with a sense almost the same as the original one of their own teeth or the artificial teeth that have been treated in this way.

These implants have recently gained much attention as they have advantages such as long life and very similar to natural teeth, without damaging the surrounding teeth except for the teeth that need to be treated, compared to the methods using dentures and bridges. .

If the implant method described above is briefly described, first, the gingival (gum) of the patient to be implanted is cut to expose the alveolar bone. Next, the position of the implant to be inserted among the exposed alveolar bone is determined, and a hole for implantation is formed by deleting a portion of the alveolar bone at the position using a drilling tool such as a drill. Next, the implant including the fixture and the abutment is placed in the formed hole, and the implant installation is completed by covering the gingiva.

On the other hand, when implanting the gingival bone by exposing the gingival bone during implantation, and using a direct drill or the like on it, it is usually difficult to accurately determine the exact position and direction to perform the drilling operation. I use an assistive device called.

In the case of such a stent, the upper and / or lower jaw of the subject is obtained using an impression material such as a rubber material before the implant procedure, and then plaster is poured on the sound to the upper and / or lower jaw of the subject. Make a plaster model that mimics the shape.

The gypsum model is then coupled to an articulator and the jaw and upper and lower teeth, almost similar to those of the subject, are reproduced outside the mouth.

And after curing by applying a resin of a transparent material to cover the cavity and the teeth missing teeth, the resin portion filled in the cavity missing teeth to form a through-hole through which the drill for drilling the implant can pass.

The transparent resin product made through this process is a stent, and the cavity made in the same shape as the tooth that the transparent resin is wrapped at the time of manufacture is inserted into the actual tooth to serve as a support for supporting the entire stent.

Recently, according to the development of 3D imaging technology, instead of the plaster model, a rapid prototyping (RP) based on 3D image data is used to produce a model that simulates the maxillary and / or mandible of the subject. Only the manufacturing process of the model is different, but the process of making the implant stent is the same.

However, such a stent, although significantly improved compared to the case without the stent when punching the dental or indental practitioner in contact with the inner surface of the stent, by securing a solid stability in the vertical or horizontal direction There were many shortcomings to induce precise placement.

This is because when drilling the alveolar bone using a drill, the drill rotates at a high speed and a high torque of about 10,000 revolutions per minute, because it is not easy to secure stability due to the high-speed rotation of the drill. In addition, the high-speed rotating drill drills the alveolar bone at a high speed. Therefore, the conventional stent that cannot accurately induce the depth and direction of the drill has a precise depth and direction while ensuring stability in the vertical and horizontal directions with respect to the teeth or teeth. It was difficult to drill with.

In order to solve this problem, the present applicant has filed an invention on the patent application 2007-0107408 "Stent for implants including an elastic body for precision induction" as shown in FIG.

The stent is filled with an elastic body having a constant elastic force therein, to ensure the stability in the vertical or horizontal direction during the punching operation for the dental or dental dental operator in contact with the elastic body, especially in the case of dental dental implants Since teeth exist in the front and rear directions of, more desirable stability and holding force were obtained.

Furthermore, additional maintenance is required in the case of a large fluctuation of teeth, such as when the teeth are not completely eccentric or when the teeth are not in the front and rear directions, or when the number of teeth is very small. Therefore, the patent application of 2007-0110279 The invention is also filed on "Stent Fixture for Implants for Precision-Induced Placement".

The implant stent fixture shown in FIG. 2 is a fixing screw 10 penetrating the fixing base 20 included in a predetermined position of the stent to screw the gingival and alveolar bone firmly to secure the stent, the implant It helps to make the drilling work for placing more stable, accurate and quick.

Applicant's prior patent as described above has an improved effect of inducing the precise placement of the implant by precisely controlling the drilling depth and direction of the alveolar bone, but in particular patent application 2007-0110279 "for implantation for precision induction The stent fixture has found that there is a part that can be further improved. That is, according to the implant stent fixture shown in Figure 2, the stent movement in the front, rear, left and right directions with respect to the gingival can be sufficiently suppressed, there is a possibility that some movement occurs in the up and down direction, that is, the puncture depth of the alveolar bone. Was found.

This is due to the elasticity of the elastic body included in the implant stent of the patent application No. 2007-0107408 and the elasticity of the gingiva itself, there is a possibility that the fixed base 20 is lowered from the initial fixed position downward from the initial fixed position For this reason, there is a problem in that the stent is not firmly fixed and may repeatedly move up and down due to the strength or absence of the vertical force.

In order to solve such a problem, the applicant has applied for a patent-pending patent application No. 2008-0069910 with a new structure of an implant-based stent fixture improved from the patent application 2007-0110279 "an implant stent fixture for precision induction placement". . A feature of the implant stent fixture 1 of Patent Application No. 2008-0069910 shown in FIG. 3 is that the fixing screw 10 is threaded to penetrate the inner alveolar bone through the inner side of the stent. In addition to the threaded portion 11, the second threaded portion 13 is provided below the head portion 14, and the second threaded portion is formed on the guide surface 23 of the fixed base 20 coupled to the fixed screw 10. The female threaded portion 24 coupled with the portion 13 is provided.

Accordingly, the stent fixture 1 is coupled to the female threaded portion 24 formed on the fixed base 20 and the second threaded portion 13 of the fixed screw 10, whereby the fixed base 20 is coupled to the alveolar bone. Since the first threaded part 11 and the second threaded part 13 are fixed in two places, the degree of freedom in the vertical direction can be maintained.

Patent application No. 2008-0069910 of the applicant's prior patent as described above, the stent fixture 1 is formed on the fixed base 20, the female thread 24 and the second threaded portion 13 of the fixed screw 10 ) Is coupled, and thus the fixing base 20 is fixed in two places in the first threaded portion 11 and the second threaded portion 13 coupled to the alveolar bone, thereby limiting the freedom in the vertical direction. It has the advantage of greatly improving the fixing force of the stent for the use, but in the process of the treatment to the practitioner, some improvements have been found.

That is, the fixing base 20 of the implant stent fixture shown in FIG. 3 is inserted and fixed inside the stent. When the fixing screw 10 is actually screwed into the alveolar bone of the subject, the fixing screw 10 is fixed. There was often a case where there was a slight deviation between the second threaded portion 13 of the screw and the female threaded portion 24 of the fixed base 20. This is because the point where the first threaded portion 11 of the fixed screw 10 starts to be screwed as the torque is applied to the alveolar bone (rotation angle) is irregular according to the subject, and thus the second threaded portion of the fixed screw 10 Since the relative position between the female threaded portion 24 of the fixing base 20 and the fixed base 20 changes from time to time, the screwing of the second threaded portion 13 and the female threaded portion 24 is precisely made as originally intended. It is not supported. This misalignment results in excessive or underestimation of the fixation force of the implant stent.

Of course, this problem can be solved if the position and angle of the fixed base 20 inserted and fixed inside the stent can be accurately corrected in advance, but making the stent while maintaining the position and angle of the fixed base 20 accurately It is very difficult. In addition, even if the position and angle of the fixed base 20 are accurately adjusted as calculated, since the possibility of idle rotation of the fixing screw 10 may occur depending on the condition of the alveolar bone, the position of the fixed base 20 is eventually reduced. To solve the problem by adjusting the angle and the angle is only an inefficient idea.

Therefore, the present invention is used to obtain additional holding force from the alveolar bone when it is difficult to sufficiently obtain the fixation force of the implant stent from the tooth, such as in the case of completely edentulous teeth or teeth that are not in the front and rear directions or when the number of teeth is very small. The object of the implant stent is to have a new structure that can completely limit the movement of the stent up and down by fixing the fixing screw firmly in the upper and lower places irrespective of the rotation amount of the fixing screw. .

The fixture of the stent for implants for precision induction according to the present invention, the base in contact with the gingival of the subject, a column extending over the base, the base formed on the top of the column and the male thread formed on the outer peripheral surface An anchor bushing including an additionally formed cap fastening portion, the through-hole is formed therein along the longitudinal direction, and a cylindrical body, a head formed at one end of the body portion and a screw portion formed from the other end of the body portion. A fixing screw inserted into the through hole of the anchor bushing; And a cylindrical body, the lower surface of which is formed a hole of a non-perforated circular cross section for accommodating the head of the fixing screw, and the inner circumferential surface of the hole has a female threaded portion screwed with the male threaded portion of the anchor bushing; It is made, including.

The head of the fixing screw is formed in a hexagon, the diameter of the hole formed in the lower surface of the cap is configured to be equal to or greater than the length between two vertices facing the center of the hexagonal head.

On the other hand, the head of the fixing screw may be formed in a circular shape, the upper surface of the circular head is provided with a hexagonal cross-sectional groove, the diameter of the hole formed on the lower surface of the cap is configured to be equal to or larger than the diameter of the circular head portion do.

And the depth of the hole formed in the cap is greater than the height of the head of the fixing screw so that the male screw and the female screw can be screwed at least one rotation, the height of the head of the fixing screw and the cap fastening portion of the anchor bushing It is formed to be less than or equal to the sum of the heights. At this time, the upper surface of the seat of the anchor bushing is formed with an annular seat defined by the outer space of the cap fastening portion, it is preferable that the lower surface of the cap is seated on the annular seat.

In addition, a seating surface may be formed along a circular boundary line between the upper surface of the cap fastening portion and the through hole, and a chamfer may be formed on the outer circumference of the lower surface of the head of the fixing screw.

At least one plane is preferably formed on an outer circumferential surface of the pillar of the anchor bushing. In an embodiment of the present invention, the cross-sectional shape of the pillar of the anchor bushing in a plane orthogonal to the longitudinal direction of the through hole is configured to form a rectangle. .

And the pillar of the anchor bushing is preferably tapered so that its cross-sectional area is reduced in the direction extending from the base to the left.

The present invention is an implant used to obtain additional holding force from the alveolar bone when it is difficult to sufficiently obtain the fixing force of the implant stent from the tooth, such as in the case of completely edentulous teeth or teeth are not in the front and rear direction or the number of teeth is very small. Since the fixing stent for the stent can be firmly fixed in two places, regardless of the amount of rotation of the fixing screw, it has the advantage that it can effectively limit the vertical movement of the stent very effectively.

In particular, the present invention, even though the fixing screw is fixed in two places up and down as in the prior patent application No. 2008-0069910 of the applicant, it is possible to freely adjust the torque of the fixing screw to secure the fixing force of the implant stent Because they can be precisely matched to the level, even in the unlikely event of an implant procedure, a very flexible response is possible.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 4 schematically shows a state in which the anchor bushing 100 and the fixing screw 200 and the cap 300 forming the fixture 10 of the implant stent for precision induction according to an embodiment of the present invention is coupled to 5 is a sectional view of the anchor bushing 100, FIG. 6 is a perspective view of the fixing screw 200, FIG. 7 is a sectional view of the cap 300, and FIG. 8 is an anchor bushing 100 and the fixing screw. (200) and the cap 300 is a cross-sectional view of the combined state, Figure 9 is a perspective view of a state in which the anchor bushing 100 and the fixing screw 200 and the cap 300 is coupled, Figure 10 is the present invention Figure 2 schematically shows a state in which the anchor bushing 100 and the fixing screw 200 'and the cap 300 forming the fixture 10' of the stent for implantation for precision induction according to another embodiment of the coupling Perspective view.

First divided into the configuration of the fixture 10 of the implant stent according to an embodiment of the present invention, as shown in Figures 4 to 9, the screw is coupled to the alveolar bone to provide a holding force to the stent An anchor bushing 100 and the fixing screw which are inserted into and fixed in the stent to guide the coupling direction of the fixing screw 200 and serve as a medium for transferring the holding force of the fixing screw 200 to the stent. The cap 300 is screwed with the anchor bushing 100 to apply pressure to the upper surface 224 of the head while accommodating the head 220 of the head 200.

The anchor bushing 100 includes a base 110 in contact with the gingival of the subject, a pillar 120 extending over the base 110, a seat 130 formed on the pillar 120, and the seat 130 includes a cap fastening portion 140 extending upward and having a male screw portion 142 formed on an outer circumferential surface thereof, and an entrance through which the fixing screw 200 to be described later passes through the cap fastening portion 140. Phosphorus through-hole 150 is formed through the longitudinal direction. The base 110 is a portion constituting the bottom surface of the anchor bushing 100 is not particularly limited in shape, in this embodiment is made of a circular disk shape.

And the configuration of the fixing screw 200, the cylindrical body 210, the screw extending from the other end of the head portion 220 and the body portion 210 formed on one end of the body portion 210 It includes a portion 230. The fixing screw 200 is inserted into the through hole 150 of the anchor bushing 100. The outer circumferential surface of the body portion 210 is in contact with the inner circumferential surface of the through hole 150 along the through hole 150. The fixed screw 200 is guided. And the screw portion 230 refers to the portion that is screwed into the alveolar bone.

The head 220 is seated on the upper surface of the cap fastening portion 140 of the anchor bushing 100, the force applied to the anchor bushing 100 while the fixing screw 200 is lodged in the alveolar bone is the head 220 ) And the cap fastening portion 140 are transmitted by the contact. The mounting surface 144 is formed along a circular boundary line where the upper surface of the cap fastening portion 140 and the through hole 150 meet so that the contact occurs smoothly, and the head 220 of the fixing screw 200 is formed. It is preferable to form a chamfer 222 corresponding to the seating surface 144 on the outer circumference of the lower surface.

In addition, the head portion 220 also functions as a portion to which a tool for applying a torque to the fixing screw 200, in this embodiment, the head portion 220 is formed in a hexagon. However, it is also possible to make the shape of the head 220 circular, as shown in another embodiment 10 'of the present invention shown in FIG. When the circular head portion 220 'is configured, the hexagonal cross-shaped groove 226 into which the hexagonal wrench can be inserted is provided on the upper surface 224' of the circular head portion 220 '. The size of the hole 320 of the cap 300 to be described later is determined according to the shape of the heads 220 and 220 ', which will be described in the corresponding part of the cap 300.

The cap 300 is formed of a cylindrical body 310, the lower surface 340 of the hole 320 of the non-perforated circular cross section that can accommodate the head portion 220, 220 'of the fixing screw 200 Is formed. The inner circumferential surface of the hole 320 is formed with a female screw portion 322 that is screwed with the male screw portion 142 of the anchor bushing 100.

The cap 300, the bottom surface 330 of the hole 320 by pressing the upper surface (224, 224 ') of the head of the fixing screws (200, 200') serves to firmly fix the fixing screws (200,200 ') to the anchor bushing (100). By the configuration of the cap 300, the fixing screw (200,200 ') is fixed in two places of the alveolar bone (screw portion) and anchor bushing (cap). Therefore, since the fixing screws 200 and 200 'of the implant stent 10 and 10' according to the present invention are firmly fixed in two places, the stent can completely suppress the vertical movement of the stent.

In particular, the present invention, since the upper fixing of the fixing screw (200,200 ') is made by the combination of the anchor bushing 100 and the cap 300, it is not affected at all how much the fixing screw (200,200') rotated. This means that the screw coupling between the screw portion 230 and the alveolar bone and the screw coupling between the cap 300 and the anchor bushing 100 are independent of each other, and thus, between the fixing screws 200, 200 ′ and the anchor bushing 100. The possibility of misalignment in the fixation is essentially eliminated.

The configuration of the cap 300 according to the present invention, in particular the diameter and depth of the hole 320 is the size of the head portion 220, 220 'of the fixed screw (200, 200') and the cap fastening portion 140 of the anchor bushing 100 High is determined by this.

First, the diameter of the hole 320 should have a size such that the rotational movement for screwing the cap 300 is not interfered by the heads 220 and 220 '. Therefore, when the head 220 of the fixing screw 200 is a hexagon, the diameter of the hole 320 formed in the lower surface 340 of the cap 300 is at the center of the hexagonal head 220. It must be configured to be greater than or at least equal to the length between two opposing vertices. When the head 220 'of the fixing screw 200' is circular, the diameter of the hole 320 formed in the lower surface 340 of the cap 300 is the diameter of the circular head 220 '. It must be configured to be greater than or at least equal.

And the depth of the hole 320 formed in the cap 300, that is, the length from the lower surface 340 of the cap 300 to the bottom surface 330 of the hole 320, the male screw portion of the cap fastening portion 140 142 and the female screw portion 322 of the cap 300 must be greater than the height of the head portion 220, 220 'of the fixing screws 200, 200', so that the female screw portion 322 can be screwed at least one rotation, and also the fixing screw The height of the heads 220 and 220 'of the 200 and 200' and the height of the cap fastening portion 140 of the anchor bushing 100 should be less than or equal to the sum of the heights.

In the first condition, the depth of the hole 320 is such that the male screw portion 142 of the cap fastening portion 140 and the female screw portion 322 of the cap 300 may be screwed at least one rotation or more. The height of the heads 220 and 220 'of the 200 and 200' is to ensure the minimum screwing force. If the screw coupling force is insufficient, the cap 300 is a fixed force is pressed down on the fixing screws (200,200 ').

Second condition, the depth of the hole 320 should be less than or equal to the sum of the height of the head portion 220, 220 'of the fixing screw (200,200') and the height of the cap fastening portion 140 of the anchor bushing (100). This is because the bottom surface 330 of the hole 320 should be able to press the upper surface 224 of the head of the fixing screw 200 to be pressed. When the depth of the hole 320 is greater than this, no capping force is generated at all for the cap 300 to press the fixing screws 200 and 200 '.

If the sum of the height of the heads 220 and 220 'of the fixing screws 200 and 200' and the height of the cap fastening portion 140 of the anchor bushing 100 is equal to the depth of the hole 320, the anchor bushing 100 It is preferable to make an annular seat surface 132 is defined on the upper surface of the seat 130 of the) limited to the outer space of the cap fastening portion 140. That is, the size of the pedestal 130 (or the outer diameter when the pedestal is a disc shape) is larger than the outer diameter of the cap fastening portion 140. According to this configuration, since the lower surface 340 of the cap 300 is seated on the annular seating surface 132, excessive torque is prevented from being applied when the cap 300 is screwed to the cap fastening portion 140. There is an advantage that it can.

In addition to the above configuration, the anchor bushing 100 of the present invention can be specifically configured in the shape of the column 120 to be firmly fixed in the stent.

4, 9 and 10, at least one plane is formed on the outer circumferential surface of the pillar 120 of the anchor bushing 100, in particular in the embodiment (10, 10 ') of the present invention The cross-sectional shape of the pillar 120 in a plane orthogonal to the longitudinal direction of the through hole 150 is configured to form a quadrangle.

This is because the anchor bushing 100 fixed in the stent in the process of screwing the anchor bushing 100 and the cap 300 of the present invention is subjected to a force to rotate with the cap 300, the stent anchor bushing 100 This is because the cap 300 must be firmly fixed within the cap 300 to generate as much fixing force as desired. Therefore, by forming at least one or more planes on the outer circumferential surface of the anchor bushing 100 or by making the cross-sectional shape of the pillar 120 into a quadrangular shape, the anchor bushing 100 is a cap ( It is possible to remarkably reduce the rotation with the 300). It is also possible to form another anchor bushing with the same effect as this, for example, an anchor bushing having an elliptical outer circumferential surface or a plurality of planes having different widths on the outer circumferential surface of the anchor bushing. Of course, various other changes are possible.

Another configuration that can be considered in the shape of the pillar 120 of the anchor bushing 100 is that the cross-sectional area along the direction in which the pillar 120 extends from the base 110 of the anchor bushing 100 to the pedestal 130. Taper to be reduced.

This allows the force acting on the anchor bushing 100 to be more effectively transmitted to the stent while the fixing screws 200 and 200 'are screwed to the alveolar bone, and the anchor bushing 100 is pushed out of the stent to escape upward. To prevent it.

The technical spirit of the present invention is not limited to the embodiments illustrated in the present specification, and various modifications and variations of the illustrated embodiments can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have knowledge of. Accordingly, such modifications or variations will also belong to the claims of the present invention.

1 is a photograph of an implant stent including an elastic body for precise induction of the patent application 2007-0107408.

Figure 2 is a cross-sectional view of the implant stent fixture for precision induction of the patent application No. 2007-0110279.

Figure 3 is a cross-sectional view of the implant stent fixture for precision induction of the patent application No. 2008-0069910.

Figure 4 is a perspective view schematically showing a state in which the anchor bushing and the fixing screw and the cap forming a fixture of the stent for implants for precision induction according to an embodiment of the present invention.

5 is a cross-sectional view of the anchor bushing shown in FIG.

6 is a perspective view of the fixing screw shown in FIG.

7 is a cross-sectional view of the cap shown in FIG. 4.

8 is a cross-sectional view showing a state in which the anchor bushing and the fixing screw and the cap of FIG.

9 is a perspective view of a state in which the anchor bushing and the fixing screw and the cap of Figure 4 coupled.

Figure 10 is a perspective view schematically showing a state in which the anchor bushing and the fixing screw and the cap forming a fixture of the stent for implants for precision induction according to another embodiment of the present invention.

** Description of the main parts of the drawing **

10,10 ': Fixture of implant stent

100: anchor bushing 110: base

120: pillar 130: base

132: annular seat 140: cap fastening portion

142: male thread 144: seating surface

150: through hole 200,200 ': fixing screw

210: torso 220,220 ': head

222: chamfer 224,224 ': top of the head

226: hexagonal groove 230: screw portion

300: cap 310: body

320: hole 322: female thread

330: bottom of the hole 340: cap

Claims

In the fixture of the implant stent for implant precision induction,

A base contacting the gingiva of the subject, a pillar extending over the base, a base formed on the pillar, and a cap fastening portion extending over the base and having a male thread formed on an outer circumferential surface thereof, and having a through hole therein. Anchor bushing is formed;

A fixing screw inserted into the through hole of the anchor bushing, the body having a cylindrical body, a head portion formed at one end of the body portion, and a screw portion extending from the other end of the body portion; And

A cap formed of a cylindrical body, the lower surface of which is formed a hole of a non-perforated circular cross section for accommodating the head of the fixing screw, and the inner circumferential surface of the hole has a female screw portion screwed with the male screw portion of the anchor bushing;

Fixture of the stent for implants for precision induction including a.

The method according to claim 1,

The head of the fixing screw is formed in a hexagon, the diameter of the hole formed on the lower surface of the cap is the same as or greater than the length between the two vertices opposite to the center of the hexagonal head for implant Fixtures for stents.

The method according to claim 1,

The head of the fixing screw is formed in a circular shape, the upper surface is provided with a hexagonal cross-shaped groove, the diameter of the hole formed on the lower surface of the cap is equal to or larger than the diameter of the circular head implant for implant placement Fixtures for stents.

The method according to claim 1,

The depth of the hole formed in the cap is greater than the height of the head of the fixing screw so that the male screw and the female screw can be screwed at least one rotation, the height of the head of the fixing screw and the height of the cap fastening portion of the anchor bushing The fixture of the stent for implants for precision induction, characterized in that less than or equal to the sum of.

The method according to claim 4,

An upper surface of the seat of the anchor bushing is formed with an annular seat defined by the outer space of the cap fastening portion, the lower surface of the cap is fixed to the implant stent for implant placement, characterized in that seated on the annular seat.

The method according to claim 1,

A seating surface is formed along a circular boundary line between the upper surface of the cap fastening portion and the through hole, and a chamfer is formed on the outer circumference of the lower surface of the head of the fixing screw. Identity.

The method according to claim 1,

At least one plane is formed on the outer circumferential surface of the pillar of the anchor bushing fixture of the stent for implants for precision induction.

The method according to claim 6,

The cross-sectional shape of the pillar of the anchor bushing in a plane orthogonal to the longitudinal direction of the through hole is a fixture of the implant stent for precision induction, characterized in that the rectangular.

The method according to claim 1 or 7 or 8,

The pillar of the anchor bushing, the fixture of the implant stent for precision induction, characterized in that the tapered so that its cross-sectional area is reduced in the direction extending from the base to the seat.