KR20150051348A

KR20150051348A - Screw for implant

Info

Publication number: KR20150051348A
Application number: KR1020130132648A
Authority: KR
Inventors: 김노국
Original assignee: (주)예스바이오테크
Priority date: 2013-11-04
Filing date: 2013-11-04
Publication date: 2015-05-13
Also published as: WO2015064814A1

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an implant screw, and more particularly, to a screw for an implant that can prevent a screw which is fastened to a fixture and an abutment from being loosened to maintain a stable fastened state.
The screw for implant according to the present invention includes a threaded portion and a head portion. The head is inserted into the abutment to engage with the abutment disposed at the upper end of the fixture, and a plurality of valleys formed along the circumferential direction are formed on the outer circumferential surface in contact with the abutment. The head portion is formed to have a smaller diameter from the upper portion to the lower portion.
According to the present invention, since the valleys are formed along the circumferential direction on the outer circumferential surface, the lower surface of the screw engaged with the abutment is deformed in the valley direction when the screw is engaged. So that the deformed lower surface exerts a force on the abutment so that the screw and fixture are not unscrewed. As the diameter decreases from the upper part to the lower part and a plurality of bones are formed, deformation is caused by side contact at each valley part, thereby increasing the screwing force between the screw and the fixture.
In addition, according to the present invention, since the outer surface of the head bottom is protruded from the inner side, deformation of the head portion at the portion contacting the abutment becomes greater, thereby preventing the screws and the fixture from being unscrewed.

Description

Screw for implant "

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an implant screw, and more particularly, to a screw for an implant that can prevent a screw which is fastened to a fixture and an abutment from being loosened to maintain a stable fastened state.

A dental implant implies an artificial tooth structure formed by implanting an artificial tooth root partially or wholly to the alveolar bone and fixing a prosthesis or a crown to the artificial tooth root, do. Generally, an implant consists of a titanium fixture, an abutment fixed on the fixture, and a prosthesis, an artificial tooth fixed to the abutment.

A conventional implant structure disclosed in Korean Utility Model Registration No. 0306037 is shown in Fig.

Referring to the drawings, there are shown an abutment 4 inserted into a fixture in which a fixture 2 inserted into an alveolar bone is combined with a gum and a prosthesis, an implant 4 fastened to the fixture 2 and an abutment 4, And a screw 6 for use.

Various loads are applied to the prosthesis fixed to the abutment, which causes a problem that the engagement of the screws for the implant is released when the implant is used for a long time. In this case, up-down movement and detachment of the prosthesis may be caused, or the screw coupling portion may be damaged.

The present invention is intended to solve the above problems. An object of the present invention is to provide a screw for an implant that can prevent screwing of a screw from being released.

The screw for implant according to the present invention includes a threaded portion and a head portion.

The head is inserted into the abutment to engage with the abutment disposed at the upper end of the fixture, and a plurality of valleys formed along the circumferential direction are formed on the outer circumferential surface in contact with the abutment.

In addition, in the above-mentioned screw for implant, it is preferable that the diameter of the head is decreased from the upper part to the lower part.

In the above-mentioned screw for implant, it is preferable that the head portion is formed so as to protrude from the inner side so that the outer side of the lower surface contacting the abutment comes into contact first with the abutment from the inner side.

According to the present invention, since the head is formed with a valley along the circumferential direction, the bottom surface of the head which engages with the abutment upon screw engagement is deformed in the valley direction. Thus, the deformed lower surface will exert a force on the abutment, so that the screw connection between the screw and the fixture will not be released.

According to the present invention, since the diameter of the head portion decreases from the upper portion to the lower portion and a plurality of bones are formed, deformation due to side contact occurs at each valley portion and the screwing force of the screw and the fixture is increased by the restoring force .

In addition, according to the present invention, since the outer surface of the head portion protrudes from the inner side, deformation of the head portion at the portion contacting the abutment becomes greater, thereby preventing the screw connection from being released.

1 is a sectional view showing an implant structure to which a conventional screw for implant is applied,
2 is a perspective view of one embodiment of a screw for an implant according to the present invention,
Figure 3 is a cross-sectional view of the embodiment shown in Figure 2,
FIG. 4 is a sectional view showing an implant structure to which the screw for implant shown in FIG. 2 is applied,
5 is a sectional view of another embodiment of the screw for implant according to the present invention,
FIG. 6 is a sectional view showing an implant structure to which the screw for implant shown in FIG. 5 is applied,
7 is a cross-sectional view of still another embodiment of the screw for implant according to the present invention.

An embodiment of the screw for implant according to the present invention will be described with reference to Figs. 2 to 4. Fig.

One embodiment of an implant screw according to the present invention includes a threaded portion 32 and a head portion 34. The threaded portion 32 is inserted into the fixture 10 and threaded so that it can be threaded.

The head 34 is inserted into the abutment inner 22 to engage an abutment 20 formed on the top of the screw 32 and disposed at the upper end of the fixture 10. The head portion (34) in contact with the abutment inner side (22) forms one trough (36) along the circumferential direction. In this case, when the screw is tightened, the lower portion 34a of the head portion 34 comes into contact with the abutment 20, and the lower portion 34a is subjected to pressure so that the lower portion 34a is deformed in the direction of the valley 36 . The lower portion 34a applies a force to the abutment 20 by the restoring force so that the screw portion 32 of the screw and the screwed portion of the fixture 10 are subjected to a force. Therefore, the screw connection can not be released.

5 is another embodiment of the screw for abutment according to the present invention. Another embodiment of the abutment screw according to the present invention will be described with reference to Figs. 5 to 6. Fig.

In the embodiment shown in FIG. 5, the diameter of the head 34 decreases from the upper portion to the lower portion, and a plurality of valleys 36 formed along the circumferential direction are formed, compared to the embodiment shown in FIG. The diameter of the head part 34 becomes smaller as it goes from the upper part to the lower part, and thus the side contact is made with the abutment inner side 22. The lower portion 34a of the head 34 is deformed toward the valley 36a and the central portion 34b is deformed toward the valley 36b. The head 34 deformed in the direction of each trough 36 further increases the screwing force of the screw 30 due to the restoring force (reaction). The remaining components are the same as those in the embodiment shown in FIG. 2, and thus a detailed description thereof will be omitted.

6 is another embodiment of the screw for abutment according to the present invention. The outer side 38 of the lower surface 34 of the head 34 protrudes from the inner side 40 compared to the embodiment shown in FIG. 5 and is in contact with the abutment 20 before the inner side 40. Thus, the lower portion 34a of the head portion 34 is more deformed in the direction of the valley 36a than the embodiment of Fig. Therefore, the screw 30 can be more strongly screwed to the fixture 10.

2: Fixture 4: Abortment
6: screw 10: fixture
20: Abutment 22: Inside abutment
30: screw 32:
34: head part 34a: lower part of the head part
34b: central portion of the head portion 34c: upper portion of the head portion
36 (36a, 36b): Goal 38:
40: inside of head

Claims

A screw for an implant comprising a screw portion and a head portion,
Wherein the head has at least one rib formed along the circumferential direction.

The method according to claim 1,
Wherein the head portion has a smaller diameter from the upper portion to the lower portion.

3. The method according to claim 1 or 2,
Wherein the head portion is protruded from the inner side so that the outer side of the lower surface contacting the abutment comes into contact first with the abutment from the inner side.