WO2014042343A1

WO2014042343A1 - Implant fixture

Info

Publication number: WO2014042343A1
Application number: PCT/KR2013/005837
Authority: WO
Inventors: 이의석
Original assignee: 고려대학교 산학협력단
Priority date: 2012-09-12
Filing date: 2013-07-02
Publication date: 2014-03-20
Also published as: KR101293966B1

Abstract

The present invention relates to an implant fixture. According to the present invention, the implant fixture is inserted into osseous tissue comprising cortical bone and cancellous bone to form an artificial dental root and comprises: a body portion comprising one end and another end in which a cross-sectional area of the other end located in the direction to be inserted into the osseous tissue is smaller than that of said one end formed on the opposite side of the other end; a screw portion comprising screw threads formed along the outer circumferential surface of the body portion so that the implant fixture is operated in the implantation rotation direction implanted in the osseous tissue; a screw threads-fixing portion formed at the end of the body portion and comprising a fixing groove grooved from the screw threads to the body portion; and a concave groove formed on the surface of the screw threads. According to the present invention, by using the implant fixture and having a rough surface, a binding force with osseous tissue is increased, thereby allowing a fixing force to be maintained regardless of shallow implantation. Therefore, the implant fixture can be implanted into osseous tissue and an implanted state can be firmly fixed even if bone grafting is omitted, and thus it is possible to improve the durability of an implant and reduce all procedures and time for implantation.

Description

Implant fixture

The present invention relates to an implant fixture, and more particularly, to an implant fixture that can maintain a fixing force even when implanted at a shallow depth by increasing the contact area with bone tissue and increasing the bonding force, thereby eliminating the process of implanting bone.

Generally, when permanent teeth are damaged by aging or other factors, artificial teeth are buried in the jaw bone. In particular, when a permanent tooth is damaged due to various factors and the damaged permanent tooth is extracted, an artificial tooth that replaces the permanent tooth is embedded in place. To this end, by fastening the prosthetic implant component to the implant fixture embedded in the jawbone, and by coupling the artificial tooth to the implant, the implantation of artificial teeth is completed.

Conventional implants used to implant artificial teeth consist of fixtures, abutments and screws, the fixtures being inserted into the jawbone and joined by threads and positioning an abutment to which the artificial teeth are fixed on top of the fixture. In this state, the screw is connected to the abutment to be fastened to the fixture, thereby coupling the abutment to the upper portion of the fixture. Generally, a thread is formed along the outer circumference of the fixture, and the fixture is fastened to the jawbone by the thread.

However, if the implant is not fully coupled to the alveolar bone, the looseness of the implant fixture coupled to the gum along the thread becomes loose, and if a continuous load is applied while a portion of the implant fixture is dismantled, a gap is created in the implant fixture. Implant fixtures are detached from bone tissue as the load transmitted by them concentrates and breaks down on a portion of the bone tissue.

In the related art, in order to prevent the implant fixture from being detached from the bone tissue, the implant fixture is implanted more than a predetermined depth. Therefore, when the depth of the jawbone is shorter than the implantation depth of the implant fixture, the jawbone is implanted to a depth at which the implant fixture can be implanted, and then the implant fixture is embedded.

However, in this case, not only does it take time for the implanted bone tissue to fully settle in the jaw bone, but also when the load is applied to the bone tissue by the implant fixture, because the rigidity of the bone tissue into which the implant fixture is inserted during the transplantation is different. The load is not uniformly distributed and is concentrated in one part of the bone tissue.

Therefore, in recent years, implant fixtures can be implanted without additional bone tissue transplantation, and the need for implant fixtures having a wider bone contact area so that the implanted implant fixtures can be firmly fixed is emerging.

The problem to be solved by the present invention is to increase the binding force to the bone tissue, regardless of the depth and diameter of the implantation can maintain a fixed force after implantation, it is possible to omit the process of implanting the bone, thereby the overall procedure and procedure for implanting the implant It is to provide an implant fixture that can shorten the period.

The present invention, in order to solve the above problems, in the implant fixture to be inserted into the bone tissue formed of cortical bone and spongy bone to form an artificial tooth, provided with one end and the other end, the cross-sectional area of the other end located in the direction inserted into the bone tissue the other end A trunk portion formed narrower than the cross-sectional area of the one end formed in an opposite direction of the cross section; A thread portion formed with a thread along an outer circumferential surface of the body portion so as to drive the implant fixture in an implantation rotational direction in which the implant fixture is placed; A thread fixing part formed at the other end of the body part and having a fixing groove formed from the screw thread to the body part; And a recess formed in the shape of a dimple on the surface of the screw thread.

In addition, the present invention, in order to solve the above problems, in the implant fixture to be inserted into the bone tissue formed of the cortical bone and spongy bone to form an artificial tooth, provided with one end and the other end, the cross-sectional area of the other end located in the direction inserted into the bone tissue A tapered cylindrical body formed narrower than the cross-sectional area of the one end formed in the opposite direction to the other end; It provides an implant fixture comprising a; recessed portion formed concave in the form of a dimple on the surface of the body.

According to one embodiment of the present invention, the implant fixture is preferably roughened.

In addition, the roughness treatment method of the implant fixture is preferably any one of a blasting method, an acid treatment method and an RBM method.

In addition, the groove portion preferably has a diameter range of 1 μm to 3 mm.

In addition, the groove portion is preferably formed in an area of 10% to 90% of the total surface area of the body portion and the screw portion.

The fixing groove may further include a radially inner surface recessed in a concave shape inside the body portion in the insertion rotation direction; And a radially outer surface connected to the radially inner surface and having a shape protruding prominently in the opposite direction of the insertion rotation direction along the surface of the body portion.

In addition, the fixing groove is a radially inner surface that is recessed in the concave shape inside the body portion in the reverse direction of the insertion rotation direction; And a radially outer surface connected to the radially inner surface and having a shape protruding prominently in the insertion rotation direction along the surface of the body portion.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to this, the terms or words used in this specification and claims should not be interpreted in a conventional, lexical sense, and the inventors will appropriately define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can.

Implant fixtures according to the present invention by forming a concave groove on the surface, it can maintain a fixing force even by implanting in a shallow depth or a reduced diameter by increasing the bonding force with the bone tissue.

Therefore, the implant fixture according to the present invention can be implanted in bone tissue by omitting the bone graft process, as well as to securely secure the implanted state, thereby increasing the success rate of the implant procedure, survival rate and durability of the implant. In addition, it is possible to shorten the overall procedure and duration of implantation.

1A is an exemplary view of a screw type implant fixture according to a first embodiment.

1B is an illustration of a screw type implant fixture according to a second embodiment.

1C is an illustration of an implant fixture of cylindrical type according to a third embodiment.

1D is an illustration of an implant fixture of the cylindrical type according to the fourth embodiment.

2A is a cross-sectional view of an example taken along the line AA ′ of FIG. 1B.

2B is a cross-sectional view of another example taken along the line AA ′ of FIG. 1B.

3A is an exemplary view showing an initial state in which an implant fixture is implanted according to an embodiment of the present invention.

3B is an exemplary view showing a state after implantation of an implant fixture according to an embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

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

Conventionally, the implant fixture has a thread formed on the outer peripheral surface of the fixture body portion, the cylindrical implant fixture is formed in a cylindrical shape having a tapered cross section so that the other end is narrower in cross-sectional area than one end. At this time, in the cylindrical implant fixture, a bending point at which the cross-sectional difference is sharply formed between one end and the other end may be formed. Such an implant fixture is used as a fixing member for fixing prosthetics, such as dental and orthopedic surgeons, to bones. The bone tissue into which the implant fixture is inserted consists of spongy bone and cortical bone. The spongy bone is a relatively soft bone tissue inside the bone, and the cortical bone is harder than the spongy bone and generally forms a relatively thin film surrounding the spongy bone. Typically, since the spongy bone is provided at a position deeper than the cortical bone, when the fixture is inserted, the spongy bone is mainly placed in the spongy bone. In this case, a certain bone width and height are required to maintain the implant fixture without falling down. Therefore, in general, it is necessary to implant artificial bone or autogenous bone to match the width and height of the bone to implant the implant.

The present invention provides an implant fixture that can be stably firmly implanted even in shallow bone tissue by improving the bonding force with bone tissue even if the depth and width of the jaw bone is lower than the implantation depth of a general implant.

FIG. 1 illustrates exemplary views of an implant fixture according to various embodiments of the present disclosure. FIG. 1A illustrates an example of a screw-type implant fixture according to a first embodiment, and FIG. 1B illustrates a second embodiment of the present invention. FIG. 1C is an illustration of a cylindrical type implant fixture according to a third embodiment, and FIG. 1D is an exemplary view of a cylindrical type implant fixture according to a fourth embodiment. 2A is a cross-sectional view of one example taken along the line AA ′ of FIG. 1B, and FIG. 2B is a cross-sectional view of another example taken along the line AA ′ of FIG. 1B.

The implant fixture according to the present invention is a screw type implant fixture which is inserted into the bone tissue formed of the cortical bone and the cancellous bone to form an artificial tooth as shown in FIGS. 1A and 1B, and is provided with one end 112 and the other end 114. A trunk portion 110 formed to have a cross-sectional area of the other end 114 positioned in a direction inserted into the bone tissue narrower than a cross-sectional area of the one end 112 formed in an opposite direction of the other end 114; A screw 120 having a screw thread formed along an outer circumferential surface of the body 110 to drive the implant fixture in an implantation rotational direction in which the implant fixture is placed; A fixing part 130 formed at the end of the body part 110 and having a fixing groove 136 recessed from the screw thread to the body part 110; And a plurality of recesses 140 formed concave in the form of dimples on the surface of the thread.

In addition, the cylindrical type implant fixture according to the present invention, as shown in Figures 1c and 1d, is a cylindrical type of implant fixture to be inserted into the bone tissue formed of the cortical bone and spongy bone to form an artificial tooth, one end and the other end is provided A cylindrical body having a cross-sectional area of the other end located in a direction inserted into the bone tissue narrower than the cross-sectional area of the one end formed in an opposite direction of the other end; It includes; a plurality of grooves formed concave in the form of dimples on the body surface.

First, the screw type implant fixture illustrated in FIGS. 1A and 1B has a screw portion 120 formed along an outer circumferential surface of the body portion 110, and a recessed portion of the screw portion 120 and the body portion 110 may be concave. 140) gives roughness to the surface of the implant fixture primarily.

Thus, after roughly implanting the implant fixture by placing the roughness on the surface, the bone tissue is regenerated to the inside of the recess 140, even if the implant fixture receives a load, the implant fixture in the opposite direction of the implant rotation direction along the threaded path The movement can be prevented. Here, the implantation rotation direction refers to a direction in which the implant fixture is rotated by screwing the threads so that the implant fixture is embedded in the bone tissue.

For example, when the screw tightening direction of the implant fixture according to the embodiment of the present invention is clockwise, the implantation rotation direction is also clockwise. That is, when the implant fixture is rotated in the clockwise direction according to the placement rotation direction, the implant fixture is inserted into the bone tissue. In addition, the reverse implantation rotation direction or the reverse direction of the implantation rotation direction refers to the direction opposite to the implantation rotation direction, and refers to the direction in which the implant fixture is rotated to exit from the bone tissue. Therefore, when the installation rotation direction is clockwise, the reverse installation rotation direction refers to the counterclockwise direction. On the contrary, when the installation rotation direction is counterclockwise, the reverse installation rotation direction refers to the clockwise direction.

As described above, the surface of the implant fixture having the bone tissue and the bonding area increased primarily by removing the polish on the surfaces of the trunk 110 and the screw 120 with respect to the implant fixture having the recess 140 formed therein. Increase once more by car. Thus, the friction force between the implant fixture and the bone tissue can be further increased.

In addition, the implant fixture, which is a cylindrical type shown in FIGS. 1C and 1D, also includes a plurality of recesses 140 ′ in the trunk portion 110 ′, thereby roughening the surface of the implant fixture primarily. Of course, the cylindrical type of fixture fixture may also increase the surface area of the implant fixture with the bone tissue and the bonding area of the implant fixture increased once more, by performing a gloss removal treatment on the surface of the trunk portion 110 '. Thus, the friction force between the implant fixture and the bone tissue can be increased.

Hereinafter, the structure of the implant fixture according to the present invention will be described in detail by taking an implant fixture formed in a screw type as an example, but the present invention is not limited thereto, but is also applied to an implant fixture formed in a cylindrical shape. That is, the description of the body portion and the groove portion of the implant fixture formed of a screw type is equally applicable to the body portion and the groove portion of the cylindrical implant fixture.

A plurality of recesses 140 are disposed on the surface of the implant fixture. At this time, each of the grooves 140 formed on the surface of the implant fixture is preferably in the range of 1㎛ 3mm diameter. When the diameter of the recess 140 is less than 1 μm, the amount of bone tissue regenerated up to the inside of the recess 140 may not be enough to fix the recess 140. Therefore, when the implant fixture is continuously loaded, the bone tissue and the recess 140 are separated or the bone fixture is broken and the implant fixture is separated from the bone tissue. In addition, when the diameter of the groove portion 140 exceeds 3mm, the screw portion 120 is formed to be difficult to insert and rotate the implant fixture in the insertion rotation direction by the groove portion 140, the implant fixture can be broken have.

Therefore, the groove 140 may be formed to have a diameter in the range of 1 μm to 3 mm to allow the bone tissue to fix the groove 140, and to allow the implant fixture to be smoothly placed along the rotational direction of the implant.

The implant fixture preferably has a fixation strength and fracture strength of 45N or more. That is, when a force of 45 N or less is applied, the bone tissue implanted in the recess 140 of the implant fixture is broken so that the implant fixture is removed, or the surface of the implant fixture is broken, and the state in which the bone tissue is coupled is not separated. Therefore, in the implant fixture according to the present invention, the recess 140 is preferably formed in an area of 10% to 90% of the entire surface area of the trunk 110 and the screw 120.

When the recess 140 is formed in less than 10% of the total surface area of the trunk 110 and the screw 120, the amount of bone tissue that is implanted into the recess 140 to fix the implant fixture is insufficient. Even if a force of less than 45N is applied, the bone fixture breaks and the implant fixture separates from the bone tissue. In other words, if the fixing force is less than 45N and the chewing force is applied to the implant fixture, it is easily broken. In addition, when the groove portion 140 is formed in excess of 90% of the total surface area of the trunk portion 110 and the screw portion 120, the implant fixture is easily separated from the bone tissue while the surface of the implant fixture is broken. That is, the fracture strength of the implant fixture is less than 45N, so that the implant fixture is easily broken by the chewing force.

Therefore, the recess 140 is preferably formed in an area of 10% to 90% of the total surface area of the body portion 110 and the screw portion 120.

In addition, the fixing groove 136 formed concavely from the thread to the trunk portion 110 at the other end 114 of the implant fixture has a radial outer surface 136a radially inward as shown in FIGS. 1B and 2A, for example. By forming so as to be located in the reverse direction of the insertion rotation relative to the side surface (136b), it can be more firmly bonded to the bone tissue.

That is, when the implant fixture is placed, the bone tissue reproduced to the position of the fixing groove 136 while being smoothly rotated by the spiral image of the screw 120 is not only implanted, but also prevents the rotation of the implant fixture in the opposite direction of the implant rotation. Can be. As described above, the radially outer surface 136a of the fixing groove 136 is positioned in the opposite direction of the rotational rotation direction with respect to the radially inner surface 136b located in the rotational direction of implantation, thereby simultaneously implanting the implant fixture into bone tissue. Desorption from bone tissue can be prevented.

On the contrary, as shown in FIG. 2B, the radial outer surface 136a is formed to be positioned in the rotational direction of rotation with respect to the radial inner surface 136b, so that the implant fixture may be more smoothly implanted into the bone tissue.

Here, in the case of a cylindrical implant fixture, the fixing groove 136 ′ is a recess of the fixing groove 136 ′ formed concavely in the body portion 110 on the other end 114 ′ side of the implant fixture as shown in FIG. 1D. The radially outer side surface 136a 'is formed to be located in the opposite direction of the insertion rotation direction differently from the radially inner side surface 136b', so that it can be more firmly coupled to the bone tissue.

3 is a cross-sectional view showing a coupling relationship between the implant fixture and the bone tissue according to an embodiment of the present invention.

When the implant fixture according to an embodiment of the present invention is embedded in the bone tissue, as shown in Figure 3a, when the implant fixture is inserted into the bone tissue according to the spiral image of the screw 120, initially the bone tissue and groove 140 It will remain spaced apart. Subsequently, when a certain time elapses, bone tissue around the implant fixture is regenerated to the implant fixture surface, and as shown in FIG. 3B, bone tissue is inserted into the recess 140 according to the spiral path of the screw 120. Since the bone tissue located in the recess 140 is widened in contact with the implant fixture and the bone tissue, the bonding force is increased, and the implant fixture is prevented from being detached from the bone tissue by the chewing force.

That is, even when the chewing force is continuously applied to the implant fixture, the bone tissue implanted in the recess 140 serves as a locking jaw, thereby firmly fixing the implant fixture in the bone tissue. Thus, the implanted implant fixture can be firmly fixed in the initial implanted position.

In order for the implant fixture according to the embodiment of the present invention to give a roughness to the surface, the implant fixture is preferably roughened. The roughened implant fixture may have a rough surface to increase friction with the regenerated bone tissue. Here, the roughness treatment method applied to the implant fixture is preferably any one of a blasting method, an acid treatment method, and a RBM (Resorbable Blasted Media) method.

As described above, the implant fixture according to the present invention is implanted with a shallow depth or formed with a narrower diameter than that of a conventional implant fixture, so that the process of implanting bone separately when applying the implant fixture to bone tissue can be omitted. Therefore, not only can the implant procedure be shortened, but the implant fixture widens the area in contact with the bone tissue, and bone tissue is formed inside the recess of the implant fixture to be combined, thereby more firmly embedding the implant.

Although the technical spirit of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiments are for the purpose of description and not of limitation.

In addition, those skilled in the art will understand that various implementations are possible within the scope of the technical idea of the present invention.

The implant fixture according to the present invention can be implanted in bone tissue by omitting the bone graft process, and can also be firmly fixed in the implanted state, thereby increasing the success rate of the implant procedure, survival rate and durability of the implant. This can shorten the procedure and duration of implantation.

Claims

In the implant fixture which is inserted into the bone tissue formed of the cortical bone and the cancellous bone to form an artificial tooth root,

A body portion provided with one end and the other end and having a cross-sectional area of the other end positioned in the direction inserted into the bone tissue narrower than the cross-sectional area of the one end formed in the opposite direction of the other end;

A thread portion formed with a thread along an outer circumferential surface of the body portion so that the implant fixture is driven in a rotational direction in which the implant fixture is placed in the bone tissue;

A thread fixing part formed at the distal end of the body part, the thread fixing part having a fixing groove recessed from the screw thread to the body part; And

A recess formed in the concave surface of the thread;

Implant fixtures comprising a.
In the implant fixture which is inserted into the bone tissue formed of the cortical bone and the cancellous bone to form an artificial tooth root,

A tapered cylindrical body having one end and the other end and having a cross-sectional area of the other end located in a direction inserted into the bone tissue narrower than the cross-sectional area of the one end formed in the opposite direction of the other end; And

A recessed portion formed concave on the surface of the body portion;

Implant fixtures comprising a.
The method according to claim 1 or 2,

The implant fixture, characterized in that the roughening process.
The method of claim 3,

The roughness treatment of the implant fixture is any one of a blasting method, an acid treatment method, and an RBM method.
The method according to claim 1 or 2,

The recess is an implant fixture, characterized in that the diameter range of 1㎛ 3mm.
The method of claim 1,

The recess is an implant fixture, characterized in that formed in the area of 10% to 90% of the total surface area of the body portion and the threaded portion.
The method of claim 2,

The recess is an implant fixture, characterized in that formed in the area of 10% to 90% of the total area of the body surface.
The method of claim 1,

The fixing groove

A radial inner surface recessed in a concave shape inside the body portion in the insertion rotation direction; And

A radially outer side surface connected to the radially inner side surface and protruding prominently in the opposite direction of the insertion rotation direction along a surface of the body portion;

Implant fixtures comprising a.
The method of claim 1,

The fixing groove

A radially inner surface that is recessed in a concave shape inside the body portion in the reverse direction of the insertion rotation direction; And

A radially outer surface connected to the radially inner surface and having a shape protruding prominently in the insertion rotation direction along a surface of the body portion;

Implant fixtures comprising a.