CN103379877A

CN103379877A - Implant fixture

Info

Publication number: CN103379877A
Application number: CN2012800085723A
Authority: CN
Inventors: 金仁浩
Original assignee: Osstem Implant Co Ltd
Current assignee: Osstem Implant Co Ltd
Priority date: 2011-02-11
Filing date: 2012-02-07
Publication date: 2013-10-30
Anticipated expiration: 2032-02-07
Also published as: CN103379877B; KR101144933B1; WO2012108659A2; WO2012108659A3

Abstract

The present invention relates to an implant fixture, and more specifically, to an implant fixture which is inserted into the alveolar bone to support an artificial tooth, wherein the implant fixture comprises: a body portion vertically extended; and a screw portion spirally wound to the outer surface of the body portion along the vertical direction. The screw portion comprises: valleys; ridges of screw threads vertically spaced by the valleys; and an inclined plane connecting each of the valleys and the ridges of screw threads. The inclined plane comprises: an upper inclined plane which is upwardly and inwardly inclined from any one ridge of a screw thread; and a lower inclined plane which is downwardly and inwardly inclined from said any one ridge of a screw thread. The interior angle between the upper inclined plane and the lower inclined plane connected to said any one ridge of a screw thread is 30 degrees or less.

Description

Implant fixer

Technical Field

The present disclosure relates to an implant fixture, and more particularly, to an implant fixture having a small torque variation caused by bone tissue of a surrounding bone during an insertion process.

Background

The screw type fixture is inserted into an alveolar bone to support a dental prosthesis, and includes a body portion extending vertically and a screw portion wound at an outer surface of the body portion in a spiral form in a vertical direction. Alveolar bone into which the fixture is inserted is classified into cancellous bone and cortical bone. Cancellous bone is relatively soft bone tissue compared to cortical bone, which is harder than cancellous bone and forms a relatively thin film around cancellous bone. Generally, because the depth of cancellous bone is greater than the depth of cortical bone, the fixator is inserted and predominantly inserted in cancellous bone.

In order to insert the fixture into the alveolar bone, a hole having a certain diameter is first formed in the alveolar bone using a drill, and then the fixture is rotatably inserted into the hole and inserted into the alveolar bone by forming a female thread in the hole.

In alveolar bone, because people have different bone densities, some people have harder bone tissue and some people have softer bone tissue. An operator operating an implant fixture will first use a specific test to examine the bone tissue of the user on which the operation is to be performed. Then, if the operator determines that the alveolar bone of the user, on which the operation is to be performed, is suitable for the implant fixture, the operator forms a hole in the alveolar bone of the user, on which the operation is to be performed, and inserts the implant fixture.

Specifically, as shown in fig. 1, when the fixture 100 is placed in softer bone tissue (i.e., cartilage), a hole having a smaller inner diameter d3 is formed by drilling, and the fixture 100 is inserted into the hole. As such, when the fixture 100 is placed in an alveolar bone having soft bone tissue, the fixture 100 is inserted, and a portion of the fixture 100 contacting with the surrounding bone is fixed to have a wide area, and thus the fixture 100 can be stably fixed in the alveolar bone.

Further, as shown in fig. 2, when the fixture 100 is placed in normal bone tissue (i.e., normal bone), a hole having a wider inner diameter d2(d2> d3) is formed during drilling, and then the fixture 100 is inserted into the hole, thereby preventing excessive insertion torque from being generated during the process of placing the fixture 100 and enabling the fixture 100 to be stably fixed in an alveolar bone.

Further, as shown in fig. 3, when the fixture 100 is placed in hard bone tissue (i.e., hard bone), a hole having a wider inner diameter d1(d1> d2> d3) is formed during drilling and then the fixture 100 is inserted into the hole, thereby preventing excessive insertion torque from being generated during the process of placing the fixture 100 and enabling the fixture 100 to be stably fixed in the alveolar bone.

In particular, since the hard bone has a bone tissue harder than that of the cartilage or the normal bone, the fixture can be stably fixed into the alveolar bone of the user having the hard bone tissue to be operated thereon even when the fixture occupies a small area when in contact with the alveolar bone.

An operator inserts the fixture by using a basic theory, but it is not easy to accurately determine the bone tissue, and a problem frequently occurs in that holes having a small area are formed in spite of hard bone tissue, or holes having a wide area are formed in spite of soft bone tissue.

That is, as shown in fig. 4, when bone tissue is accurately determined before the insertion of the fixture, the fixture can be inserted using a torque within an appropriate torque range, and therefore, there occurs no problem in that alveolar bone and surrounding bone into which the fixture is inserted are damaged. However, when the bone tissue is not accurately determined, the above problem occurs.

In particular, when a small-sized drilled hole is formed because bone tissue is determined to be weaker than actual bone tissue, the insertion torque rapidly increases. In this case, the insertion torque applies excessive stress to the surrounding bone tissue during insertion of the fixator, thereby damaging the surrounding bone and causing bone resorption.

Further, when a drilled hole having a wide area is formed because the bone tissue is determined to be stronger than the actual bone tissue, the insertion torque is weak, and thus, the surrounding bone into which the fixture is inserted is not damaged during the insertion of the fixture. However, the fixator cannot be stably fixed because the contact area between the fixator and the surrounding bone tissue is too narrow. That is, the fixing force is weak because the surrounding bone has soft tissue, but the fixator cannot be stably and stably fixed because the contact area between the fixator and the surrounding bone tissue is narrow.

Detailed Description

Technical problem

The present disclosure provides an implant fixture in which the amount of compression (interference) of the surrounding bone is less affected by the size of the preformed bore hole or the inserted bone tissue.

Technical scheme

According to an aspect of the present invention, there is provided an implant fixture inserted into an alveolar bone to support a dental prosthesis, the implant fixture comprising: a vertically extending body; and a screw part wound at an outer surface of the body part in a vertical direction in a spiral form, wherein the screw part includes: a plurality of roots; a plurality of crests vertically separated from each other by the root; and a ramped surface connecting the crest and the root, the ramped surface comprising: an upper sloped surface that slopes upward from one crest to a center of the body; and a lower slope surface which is inclined downward from the one crest toward the center of the body, and an internal angle between the upper slope surface and the lower slope surface connected to the one crest is equal to or less than 30 degrees.

The interior angle may be in the range of 10 to 30 degrees.

When the vertical interval between adjacent crests is P and the vertical width of each crest is C, C/P may be 0.1 or less.

C/P may be in the range of 0.01 to 0.1.

When the crest diameter of the screw part (fresh part) formed by the crests is D1 and the vertical interval between adjacent crests is P, P/D1 may be 0.2 or more.

P/D1 may be in the range of 0.2 to 1.0.

When the crest diameter of the screw part formed of the crest is D1 and the root diameter of the screw part formed of the root is D2, D2/D1 may be 0.77 or less.

D2/D1 may be in the range of 0.1 to 0.77.

Advantageous effects

According to the implant fixture of the present invention, even when bone tissue is not accurately determined or the size of a bore hole is not properly selected and the fixture is inserted after the bore hole, over-torque is not generated or initial fixing force is not insufficient, and a proper insertion torque can be obtained.

Description of the drawings

Fig. 1 is a view showing a state in which an implant fixture is inserted into an alveolar bone having soft bone tissue.

Fig. 2 is a view showing a state in which an implant fixture is inserted into an alveolar bone having a normal bone tissue.

Fig. 3 is a view showing a state in which an implant fixture is inserted into an alveolar bone having hard bone tissue.

Fig. 4 is a view showing a change in insertion torque based on bone tissue.

Fig. 5 is a view showing an implant fixture according to an embodiment of the present invention.

Fig. 6 is a comparative graph showing the amount of extrusion of an alveolar bone based on the thread form of the present invention and the related art.

Best mode for carrying out the invention

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

Referring to fig. 6, an implant fixture according to an embodiment of the present invention is an implant fixture which is inserted into an alveolar bone to support a dental prosthesis, and includes a body portion 20 and a screw portion 30.

The body 20 is vertically extended and has a cylindrical shape as a whole. The body 20 may be made of a material, such as titanium, which is harmless to the human body and easily fuses with the bone tissue of the alveolar bone, but any material having similar characteristics may be used without being limited thereto.

The body 20 may be made such that: a diameter thereof is gradually reduced from an upper end to a lower end, and a concave cutting part (not shown) may be disposed below the body 20 so that surrounding bone tissue may be easily cut when the implant fixture 10 is placed in an alveolar bone.

The screw part 30 is wound in a spiral form at the outer surface of the body part 20 in a vertical direction, and the cross section of the screw part 30 may be approximately trapezoidal.

The screw portion 30 includes a plurality of roots 32; a plurality of crests 31, the plurality of crests 31 being separated from each other in the vertical direction by roots 32; and a ramped surface 33 connecting crest 31 and root 32.

Further, the slope surface 33 includes: an upper slope surface 331, the upper slope surface 331 being inclined upward from one crest 31 toward the center of the body; and a lower slope surface 332, the lower slope surface 332 being inclined downward from the one crest 31 toward the center of the body. Upper ramp surface 331 and lower ramp surface 332 are, in turn, connected to crest 31.

Here, an inner angle between the upper slope surface 331 and the lower slope surface 332 connected to the crest 31 may be equal to or less than 30 degrees. Specifically, the internal angle may be in the range of 10 to 30 degrees.

In this case, when the internal angle is greater than 30 degrees, sensitivity based on bone tissue increases because torque is excessively applied to the alveolar bone during the insertion of the implant fixture 10 into the alveolar bone. Also, when the inner angle is less than 10 degrees, the cutting force is reduced because the screw part 30 is very close to having a quadrangular shape. That is, the screw part 30 according to one embodiment of the present invention has a cross-section of a sharp shape, and thus, bone sensitivity may be weakened because of a female thread formed in a surrounding bone with a small torque during the insertion of the implant fixture 10 into an alveolar bone.

When the vertical interval between adjacent crests 31 is P and the vertical width of each crest 31 is C, C/P may be 0.1 or less, and preferably, may be in the range of 0.01 to 0.1. When C/P is greater than 0.1, this is not preferred because the width of each crest 31 is relatively large, and as a result, the bone sensitivity of the user to operate it is increased. When C/P is less than 0.01, this is not preferable because the interval between adjacent threads is greater than the width of each crest 31, and thus the implant fixture is not easily inserted.

When the crest diameter of the screw portion 30 formed by the crests 31 is D1 and the vertical spacing between adjacent crests 31 is P, P/D1 may be 0.2 or more, and preferably, may be in the range of 0.2 to 1.0.

When P/D1 is less than 0.2, this is not preferable because the spacing between adjacent threads is very small compared to the diameter and the insertion torque becomes excessively strong. When the P/D1 is greater than 1.0, this is not preferable because the interval between adjacent threads is excessively wide and thus the insertion force of the implant fixture is weakened.

Further, when the crest diameter of the screw part 30 formed of the crest 31 is D1 and the root diameter of the screw part 30 formed of the root 32 is D2, D2/D1 may be 0.77 or less, and preferably, may be in the range of 0.1 to 0.77.

In this case, when D2/D1 is greater than 0.77, this is not preferable because the interval between crest 31 and root 32 is narrow, and thus the torque sensitivity is low. When D2/D1 is less than 0.1, this is not preferable because the interval between crests 31 and roots 32 is too wide for inserting the implant fixture, and thus the entire strength of the screw part 30 is weakened or the screw part 30 becomes vulnerable.

In fig. 6, the squeeze area of the thread shape based on the related art and one embodiment of the present invention is shown. First, in cartilage having weak bone tissue, the insertion area a1 of the related art is smaller than the insertion area a2 of the present invention in terms of the area inserted into the bone tissue. Also, in normal bone having relatively large bone tissue compared to cartilage, the insertion area B1 of the related art is smaller than the insertion area B2 of the present invention. Also, in a hard bone having a relatively hard bone tissue compared to cartilage and normal bone, the insertion area C1 of the related art is smaller than the insertion area C2 of the present invention. As described above, it can be seen that a user who is to operate thereon can maintain relatively low bone sensitivity by using the present invention because the area where the implant fixture 10 is inserted into the bone tissue is small when compared to the related art. Further, the area of the bone inserted is small, and therefore, when comparing the present invention with the related art, the difference in the size of the bone area in which the implant is inserted is small for cartilage, normal bone and hard bone, and the total variation in the required insertion torque is small for cartilage, normal bone and hard bone.

As described above, in the implant fixture according to one embodiment of the present invention, the screw part has a sharp shape, and therefore, even when an operator does not accurately check bone tissue or erroneously selects the size of a drilled hole and inserts the fixture after drilling, excessive torque is not generated, or initial fixing force is not sufficient, and a proper insertion torque can be obtained.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims

1. An implant fixture inserted into an alveolar bone to support a dental prosthesis, comprising:

a vertically extending body; and

a screw part wound at an outer surface of the body part in a vertical direction in a spiral form,

wherein,

the screw portion includes: a plurality of roots; a plurality of crests vertically separated from each other by the root; and a ramped surface connecting the crest and the root,

the slope surface includes: an upper sloped surface that slopes upward from one crest to a center of the body; and a lower slope surface which is inclined downward from the one crest toward the center of the body and is provided with a slope

An internal angle between the upper and lower sloped surfaces connected to the one crest is equal to or less than 30 degrees.

2. The implant fixture according to claim 1, wherein said interior angle is in the range of 10 to 30 degrees.

3. The implant fixture according to claim 1, wherein when a vertical interval between adjacent crests is P and a vertical width of each thread of the plurality of crests is C, C/P is 0.1 or less.

4. The implant fixture according to claim 3, wherein C/P is in the range of 0.01 to 0.1.

5. The implant fixture according to claim 1, wherein when a crest diameter of the screw part formed by the plurality of crests is D1 and a vertical interval between adjacent crests is P, P/D1 is 0.2 or more.

6. The implant fixture of claim 5, wherein P/D1 is in the range of 0.2 to 1.0.

7. The implant fixture according to claim 1, wherein when a crest diameter of the screw part formed of the plurality of crests is D1 and a root diameter of the screw part formed of the root is D2, D2/D1 is 0.77 or less.

8. The implant fixture of claim 7, wherein D2/D1 is in the range of 0.1 to 0.77.