KR20080110391A

KR20080110391A - Implant

Info

Publication number: KR20080110391A
Application number: KR1020070059081A
Authority: KR
Inventors: 임성훈
Original assignee: 조선대학교산학협력단
Priority date: 2007-06-15
Filing date: 2007-06-15
Publication date: 2008-12-18

Abstract

An implant is provided to improve the stability since deformation of the shape is not generated and to make implantation easy. An implant(10) including the screw(14) in which the screw thread is formed comprises: a head unit(11) in which the groove(12) connecting the elastic chain for correction or the spring is formed; and a flute(15) which is extended downward from the lower part of the head unit, is deeply inserted in the screw from the outer circumference at a certain depth, and is extended to the bottom in the spiral direction.

Description

Implants {Implant}

1 is a front view showing an implant according to the present invention,

2 is a front view showing a first implant used in the experiment,

3 is a front view showing a second implant used in the experiment,

4 is a photograph showing the screw portion of the first implant after the experiment 2,

5 is a photograph showing the screw portion of the second implant after the experiment 2,

Figure 6 is a photograph showing the screw portion of the third implant after performing Experiment 2.

The present invention relates to an implant, and more particularly to an implant that is easy to place in the cortical bone.

Recently, it is known that orthodontics affect not only dental health, but also children's personality development is increasing interest in correction.

In general, in order to correct protruding front teeth, the front teeth must be moved backwards. To do this, space is required between densely packed teeth first, so the small molars are pulled out to make a free space, and then the teeth to be corrected are gradually moved backwards. At this time, in order to effectively move the protruding incisor is required a fixed source to support the molar (molar area).

Until now, headgear or TPA (trans palatal arch) methods have been used to serve as a fixed source. However, the headgear fitted to the gums was not aesthetically ill, and the children had a problem of rejection, and it was difficult to wear all day, so there was a limit to preventing the molar region from moving forward. TPA method is a cumbersome and inconvenient way of connecting and not moving with the back wire so that the teeth of the back does not push forward.

Recently, mini implants (also known as mini screw) treatment methods have been introduced and have been in the spotlight. This procedure is widely used in orthodontic treatment of children because it has the effect of improving orthodontics and protruding lips at the same time. Mini implants use titanium, which is used as an artificial tooth or artificial joint, as a main material, so it has strong support and does not damage the tissues in the mouth. And the miniscrew fixed to the gum is almost 1 ~ 2mm in diameter, so there is almost no pain when removing it, and after 2 ~ 3 days after removing the braces, it can be fully recovered and eat a normal diet. In addition, the procedure is available to patients who have lost mooring because of no molar teeth, so it is widely used in elderly people.

The mini implant is directly placed in the cortical bone, the screw does not enter the cortical bone enough to stop in the process of entry, there is a problem that the fracture occurs in the screw. In addition, there was a problem that the bone chip generated during the implantation process of the mini implant is not effectively discharged.

The present invention has been made in order to solve the above problems, it is easy to implant in the cortical bone, and the purpose of providing an implant with improved stability because the fracture does not occur in the screw or deformation occurs during the implantation process.

The implant according to the present invention for achieving the above object is a head portion formed with a groove that can connect the elastic chain or spring for correction, and extends downward from the lower portion of the head portion, the screw portion is formed threaded to be implanted in the cortical bone It is provided, the screw portion is introduced into the predetermined depth from the outer circumferential surface is formed with a flute extending in the lower direction along the spiral direction.

The flute is formed in a direction corresponding to the direction in which the screw thread of the screw is formed, and has a length corresponding to a length corresponding to the thickness of the cortical bone in which the screw part is placed, and a cutting edge is formed at a boundary between an outer circumferential surface of the flute and the screw part. It is preferably formed.

Hereinafter, an implant according to the present invention will be described in more detail with reference to the accompanying drawings.

Referring to FIG. 1, an implant 10 according to the present invention includes a head portion 11, a screw portion 14 extending a predetermined length downward from a lower portion of the head portion 11, and an outer circumferential surface of the screw portion 14. The flute 15 which penetrates into the predetermined depth inward is provided.

The head portion 11 is provided with a calibration groove 12 formed to be inserted into the outer circumferential surface to connect the elastic chain or spring for calibration, the upper portion is calibrated to prevent the elastic chain or spring from being separated out The protrusion 13 of larger diameter than the groove 12 is provided.

The screw portion 14 extends downwardly from the lower end of the head portion 11, the thread is formed on the outer peripheral surface. Implant 10 of the present invention is a self-drilling type that does not require a mucosal incision or a separate drilling process. Therefore, a screw thread is formed on the outer circumferential surface of the screw part 14 so that the screw part 14 can be inserted into the cortical bone to be directly implanted by rotating the screw part 14.

The length or diameter of the head portion 11 and the screw portion 14 may be variously formed by various conditions such as the position in the oral cavity to be placed.

The flute 15 is intended to facilitate the insertion of the screw portion 14, and is introduced into the outer peripheral surface of the screw portion 14 by a predetermined depth, and extends a predetermined length upward from the lower end of the screw portion 14 do. The flute 15 is formed on the outer circumferential surface of the screw portion 14 while rotating in the same direction as the rotational direction of the screw thread of the screw portion 14. Since the flute 15 extends while rotating in the same direction as the rotational direction of the thread, when the screw portion 14 is placed in the cortical bone, the discharge path of the main chip is relatively wider than when the flute 15 extends in a straight line. In addition, since the main chip can be discharged linearly, the discharge of the main chip increases, so that the screw 14 can be placed more easily. And the extension length of the flute 15 preferably corresponds to the thickness of the cortical bone to be implanted.

In addition, by sharply forming a boundary between the flute 15 and the outer circumferential surface of the screw portion 14, when the implant 10 is placed in the cortical bone, the screw portion 14 may be more easily rotated.

The implant 10 having the spiral flute 15 according to the present invention and the implants 20 and 30 having the flutes extending in a straight line were compared through experiments.

First of all, three kinds of self-drilling implants having the same conditions as the outer diameter, the inner diameter, and the pitch of the length threads, but having different types of flutes, were prepared. The first implant 20 has a straight flute as shown in FIG. 2 and extends over three threads. As shown in FIG. 3, the second implant 30 is formed with a flute that is straight and extends over five threads, and the third implant 10 is shown in FIG. 1 as an implant 10 according to the present invention. As shown, the flute extends along the same spiral direction as the rotational direction of the thread and is formed over five threads.

And prepare a bone block having a thickness of 4mm and similar properties to the cortical bone.

Experiment 1-2mm bone block placement experiment

Each of the first to third implants was divided into ten first to third groups, and each implant was placed in the bone block of the bone using a screw torque tester for bone fixation.

For reference, the bone fixation screw torque tester used in this experiment meets ASTM, or the US Material Testing Association's standard. The rotation speed is 3rpm and the vertical load is 1.14kgf.

In the process of implanting each group of implants using the bone fixation screw torque tester, the time taken for the implantation from the start of the implantation until the tightening torque appears, and the maximum torque value, ie, the maximum removal torque, which occurred in the screw removal process are measured and The results are summarized in the following table.

Bone Block (4mm) First implant 2nd implant 3 implants Placement time (sec) 445.0 ± 42.9 419.7 ± 42.5 331.1 ± 25.6 Removal torque (N * cm) 10.0 ± 1.6 10.9 ± 1.5 14.6 ± 1.6

As shown in Table 1, the implantation time was confirmed that the third implant 10 according to the present invention takes only 74 to 78% of the implantation time for the first and second implants 20 and 30 to be implanted. Could.

In addition, since the maximum removal torque of the third implant 10 was measured to be about 150% of the first and second implants 20 and 30, it can be expected that the risk of the implantation being separated from the cortical bone to reduce the corrective force is significantly reduced. It was confirmed.

The shortening of the implantation time of the third implant is because the shape of the flute is formed along the spiral direction, because the discharge of the main chip through the flute can be performed smoothly.

In addition, the chip can be easily discharged to minimize the generation of frictional heat generated during implant placement.The frictional heat between the gum or cortical bone and the screw during the implantation can cause damage to the gum and cortical bone by heat. Come. This causes a problem that the cost and the patient's pain increases because the patient requires additional treatment after implantation, the implant according to the present invention has a short time for the screw portion to be placed in the cortical bone, the chip heat is smooth and frictional heat Since the occurrence is significantly reduced, damage of the oral breakfast due to frictional heat can be minimized, thereby reducing the burden on the patient.

4 to 6 are photographs taken of the screw part under a microscope to observe whether the screw part is deformed after measuring the maximum removal torque of the first to third implants 20, 30, and 10 used in Experiment 2. have.

As shown in FIGS. 4 to 6, even after the third implant 10 according to the present invention is removed from the main block, the deformation of the screw portion or the flute of the screw portion hardly occurs, but the first and second implants 20 and 30 are not shown. It can be seen that the interface between the flute and the thread and the flute are blunt. Therefore, when the implant is formed in the spiral direction according to the present invention is implanted in the cortical bone, it can be easily implanted without deformation of the shape, the generation of frictional heat during the implantation process in the first, second implants (20, 30) In comparison, it can be seen that the third implant 10 is significantly reduced.

The implant according to the present invention has the advantage that the flute is extended while rotating in the same direction as the thread forming direction, so when the implant is placed in the cortical bone, the ejection of the chip is easy and the implantation is easy and the possibility of breakage of the screw part is significantly reduced. to provide.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims

An implant comprising a head portion having a groove for connecting an orthodontic elastic chain or a spring, and a screw portion extending downward from a lower portion of the head portion and having a threaded screw portion to be placed in a cortical bone,

The screw portion is inserted into the predetermined depth from the outer circumferential surface in the screw portion, characterized in that the flute is formed extending to the lower end in the spiral direction.

The method of claim 1,

The flute is implant, characterized in that formed in a direction corresponding to the direction of formation of the screw thread of the screw.

The method of claim 1,

The flute is characterized in that the implant is formed in a length corresponding to the length corresponding to the thickness of the cortical bone implanted.

The method of claim 1,

Implant, characterized in that the cutting edge is formed on the boundary between the flute and the outer peripheral surface of the screw portion.