KR20190007873A

KR20190007873A - Implant fixture having concave flange for anchor

Info

Publication number: KR20190007873A
Application number: KR1020170089476A
Authority: KR
Inventors: 최동주; 김진수; 홍남희; 이영만
Original assignee: 주식회사 라이프덴토메디칼
Priority date: 2017-07-14
Filing date: 2017-07-14
Publication date: 2019-01-23
Also published as: WO2019013388A1; KR101972980B1

Abstract

The present invention relates to an implant fixture having a concave flange for an anchor. By providing a concave flange on the head portion of the implant fixture, even if the side projecting length of the head is short, the contact area with the alveolar bone is sufficient, In this case, the edge of the concave flange is fixed by an anchor, the bone is implanted simultaneously by the hole, and asymmetric concave flange or cut concave flange forms a groove on one side or both sides of the ball and tongue direction, The implant can be implanted without bone grafting even when the width is small and the edge of the concave flange is fixed to the alveolar bone with the anchor, so that the present invention can be applied not only to the separation type but also to the integral type.

Description

[0001] IMPLANT FIXTURE HAVING CONCAVE FLANGE FOR ANCHOR [0002]

The present invention relates to an implant fixture, and more particularly, to an implant fixture having a concave flange for an anchor that can be fixedly inserted into an alveolar bone at a predetermined depth.

An implant is one of the dental procedures that restores tooth function with an artificial tooth by implanting a screw-shaped implant fixture into the alveolar bone to replace the tooth root of the missing tooth, and then applying a prosthesis to the alveolar bone.

As the implant procedure is becoming more common, a variety of implant fixtures have been developed. The implant fixtures developed so far can be largely divided into separate types and integral types. The former has a structure in which an abutment is inserted and then fastened with a screw which is divided into an external protrusion type and an internal insertion type depending on the type of the fastening part with the abutment, The latter has a structure that allows the prosthesis to be directly attached without screwing.

Since the implant fixture has advantages and disadvantages depending on the structure of each type, it can be selected depending on the patient's alveolar bone state or the object of the artificial tooth such as the front teeth or the molar teeth.

However, the conventional implant fixture has a disadvantage in that the stress generated by the chewing activity can not be properly dispersed as the force is dispersed only in the region implanted in the alveolar bone, regardless of the structure of any kind. In order to solve such a problem, the present inventor has developed a stress-dispersed implant fixture having a head portion exposed to the outside of a bone structure as disclosed in Korean Patent No. 10-1327655.

The stress-dispersed implant fixture has the effect of dispersing the stress on the bone structure by forming the lower diameter of the head portion larger than the body portion having the helix. However, since the lower surface of the head portion is simply horizontally expanded to increase the contact area with the alveolar bone, (When the bone width is 6 mm and a separate type is used, it is preferable that the upper end width of the body part is 4 mm or more because of the screw loosening prevention and the like. At this time, the expandable length of the lower part of the head is limited to 1 mm or less) As in the case of stagnation, when a considerable amount of time has elapsed after the extraction, a hole is formed in the alveolar bone, or a groove is formed on one side or both sides of the ball and the tongue. If the alveolar bone is small in width, There is a problem.

In order to solve the problems of the prior art, the present invention has been made to solve the problems of the prior art, that is, even if the projecting length of the bottom surface of the head of the implant fixture is short, the contact area with the alveolar bone is sufficient, It is an object of the present invention to provide an implant fixture having a concave flange for an anchor that can be implanted without separate bone implantation even when the alveolar bone has a small width, and can be applied to an integral type as well as a separate type implant.

In order to achieve the above object, according to the present invention, there is provided an implant fixture comprising a body part formed with threads on the outer surface thereof and inserted into the alveolar bone, and a head part formed on the upper end of the body part, Wherein the concave flange has a protruded concave flange, the concave flange has a concave groove formed on a lower surface thereof, and the concave groove is formed symmetrically with the body portion as a central axis.

The concave groove is formed between the upper end of the body part and the edge of the concave flange and the upper surface of the concave flange is symmetrical with respect to the body part as a central axis and inclined downward toward the edge. Other features.

The edge of the concave flange is a circular tip protruding downward and the end of the circular tip is further lowered from the upper end of the body part to a certain depth below the implant fixture according to the present invention.

The distal end of the horseshoe-shaped tip is further lowered from the upper end of the body part to a certain depth below the edge of the concave flange, Other features.

Wherein the recessed flange has a cut surface cut at a predetermined distance on opposite sides thereof and an edge except for the cut surface forms an arc tip protruding downwardly and an end of the arc tip is moved downward The implant fixture according to the present invention is characterized in that it is lowered.

The protruded length of the side surface of the concave flange is 0.1 to 0.5 mm, which is another feature of the implant fixture according to the present invention.

Another characteristic of the implant fixture according to the present invention is that the concave groove has a curvature radius different from that of an inner curved surface and an outer curved surface with respect to a ceiling.

The radius of curvature of the outer curved surface is larger than the radius of curvature of the inner curved surface, and the height of the ceiling of the recessed groove is 0.05 to 0.25 mm from the upper end of the body, according to another aspect of the present invention.

According to the present invention, since the concave flange formed by curving the lower surface of the head portion of the implant fixture is provided, even if the length of the side projecting portion of the head portion is short, the area of contact with the alveolar bone is sufficient. When the hole is formed in the alveolar bone, the anchor is fixed and the bone can be implanted concurrently by inserting the hole. The asymmetric concave flange or the cut concave flange causes a groove on one side or both sides of the ball and tongue direction, The implant can be implanted without bone grafting, and since the edge of the concave flange is fixed to the alveolar bone with an anchor, it can be applied not only to the separation type but also to the integral type.

FIG. 1 is a perspective view of an implant fixture according to an embodiment of the present invention, together with a partial cross-sectional view and a plan view of the head portion.
FIG. 2 is a cross-sectional view showing a concave flange of the implant fixture according to FIG. 1 inserted into the cortical bone at a certain depth.
FIG. 3 is a cross-sectional view showing a state where the implant fixture according to FIG. 1 is inserted into the alveolar bone hole.
4 is a perspective view of an implant fixture having an asymmetric concave flange according to another embodiment of the present invention, together with a top view of the head portion.
5 is a perspective view of an implant fixture having a cut concave flange according to another embodiment of the present invention, together with a top view of the head portion.
FIG. 6 is a perspective view of the implant fixture according to each embodiment of the present invention, viewed from above the alveolar bone, according to the state of the alveolar bone.
7 is a perspective view showing an example in which the concave flange of the implant fixture according to the present invention is applied to the separable outer protruding type (a) and the integral type (b).

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

1 to 7, the implant fixture according to the present invention includes a body 10 having basically external threads 12 and 14 formed thereon, And a head portion 20.

Here, the body portion 10 is a portion to be inserted into the alveolar bone. The alveolar bone consists of a cortical bone and a cancellous bone. The former is called a compact bone and has a higher hardness due to its higher bone density than the latter. It is formed with a thickness of about 1 to 2 mm, depending on its location, surrounding the latter.

The shape of the body 10 may be a cylindrical shape, but a wedge shape having a smaller diameter as it goes downward is preferable because it can increase the diameter of the screwed portion and reduce the loss of bone.

In addition, the outer surface of the body 10 may be formed without a thread, but it is preferable to form a thread to facilitate the implantation and roughen the surface to increase the fusion speed with the bone. In the latter case, the characteristics of the alveolar bone can be used to determine whether the thread 12 of the part to be inserted into the cancellous bone 200 and the height of the thread 14 of the part to be inserted into the cortical bone 300 are different .

The material of the body 10 is titanium as usual and the titanium body 10 having the threads 12 and 14 may be further coated with hydroxyapatite.

The head part 20 is formed on the upper end of the body part 10 and has various shapes and functions according to the type of the implant fixture.

First, as shown in FIGS. 1 to 6, a hexagonal coupling groove 24 is formed on the upper surface 22 of the head portion 20 when the coupling type is a detachable type. 7 (a), the hexagonal protrusion 26 is formed on the upper surface 22 of the head portion 20 in the case of a detachment-type external protrusion. An abutment (not shown) having a fastening portion corresponding to each of the hexagonal fastening groove 24 and the hexagonal protruding portion 26 is fitted and finally fastened with a predetermined screw (not shown). Of course, the hexagonal locking groove 24 and the hexagonal protrusion 26 need not necessarily be hexagonal, but may have other shapes such as octagonal, square, triangular or the like.

7 (b), the abutment 28 may be integrally formed with the body 10 on the upper surface 22 of the head portion 20 when the body portion 10 is integral with the body portion 10 have. 6 (c) and 6 (d), the width Wb of the body portion 10 is smaller than the width W of the body portion 10, Even in small cases, there is an advantage that implant treatment can be performed even if bone grafting is not performed separately. Generally, when the width W of the body 10 is reduced, the area to be fused with the alveolar bone becomes smaller and the stress dispersing ability during the chewing motion is lowered. In this embodiment, however, the concave flange 23 Is inserted into the cortical bone 300, it is possible to overcome the problem that the width W of the body part 10 becomes small.

1 to 6, a description will be given mainly to an embodiment of a removable implant-in-place fixture, but the content of the concave flange 23, which is a core technical idea of the present invention, The present invention can be applied to the embodiments of the external protruding implant fixture 103 as shown in FIG. 7B and the embodiment of the integrated implant fixture 104 as shown in FIG. 7B. At this time, in each embodiment, the concave flange 23 is defined as being formed between the upper end of the body portion 10 and the upper surface 22 of the head portion 20.

As shown in Fig. 1, the head portion 20 has a concave flange 23 projecting a predetermined length L to the side. The recessed flange 23 is formed with a concave groove 21 on the lower surface thereof and the concave groove 21 is formed symmetrically about the body 10 as a central axis.

2, when the implant fixture 100 is rotated and inserted into the alveolar bone after the gum 400 of the implant treatment site is cut, the concave groove 21 of the concave flange 23 The area of the cortical bone 300 to be contacted becomes rotationally symmetrical, thereby minimizing the loss of the cortical bone and reducing the insertion load.

The concave groove 21 is formed between the upper end of the body 10 and the edge of the concave flange 23. The concave groove 21 may be spaced from the upper end of the body 10 or the edge of the concave flange 23, that is, may be formed with a certain space, but as shown in FIG. 1, It is possible to maximize the area in contact with the alveolar bone, which is preferable.

1, the upper surface 25 of the concave flange 23 is symmetrical with respect to the body 10 as a central axis and is inclined downward toward the edge. As a result, the edge of the concave flange 23 where the upper face 25 of the concave flange 23 meets the concave groove 21 is formed with a downward protruding portion. As shown in Fig. 3, when the alveolar bone hole 310 is formed It becomes possible to serve as an anchor of the implant fixture 100 which can be fixed to the cortical bone 300 at the upper end of the hole 310 at the time of the procedure.

The concave flange 23 of the present invention having the above features has various embodiments according to the shape.

1 to 3 show an example in which the tip of the concave flange 23 protrudes downward and has a circular tip structure.

1 and 2, the distal end of the circular tip may be positioned at the same height as the upper end of the body portion 10 or slightly above the upper end of the body portion 10, . Here, the upper end of the body part 10 is a place where the head part 20 is formed, and the place where the concave groove 21 starts (the same applies here).

The thread 14 of the body 10 inserted into the cortical bone 300 may be formed up to the upper end of the body 10 or may be formed to a position slightly spaced from the upper end. The tip of the circular tip may be lowered to a portion where the upper thread 14 of the body 10 is formed.

In the above embodiment, the concave flange 23 has a circular tip structure with the edge of the concave flange 23 protruding downward, and the tip of the circular tip is further lowered below a predetermined depth D from the top of the body 10 2, the distal end of the circular tip of the concave flange 23 is inserted into the cortical bone 300 at a predetermined depth (D) to insert the implant fixture 100 into the spongy bone 200 and the cortical bone 300, And the concave groove 21 space 110 between the circular tip of the concave flange 23 and the cortical bone 300 is filled with the cortical bone 300 by the inflow of bone cells.

Therefore, even if the side length L of the head 20 is relatively short, the contact area of the cortical bone 300 filled in the concave groove 21 with the entire alveolar bone is sufficient, and the circular tip of the concave flange 23, And the stress dispersing ability and stability of the implant fixture 100 can be enhanced.

3 and 6 (b), when the alveolar bone hole 310 is formed in the above embodiment, the distal end of the concave flange 23 protrudes downward, The upper end of the hole 310 is covered with the concave flange 23 of the implant fixture 100 and can be fixed to the cortical bone 300 with the anchor at a certain depth so that the distance between the implant fixture 100 and the hole 310 It is possible to simultaneously carry out bone grafting by filling the space 120 of the bone graft with a powder or the like.

4 shows a perspective view of the implant fixture 101 with an asymmetric concave flange 23 'and a top view of the head portion 20' together in another embodiment.

The asymmetric concave flange 23 'has the feature of the above-mentioned concave flange (the concave groove is symmetrical with respect to the body portion as the central axis), and the edge is protruded downward (toward the right in FIG. 4) And has a horseshoe-shaped tip structure.

Here, it is preferable that the front end of one side of the horseshoe-shaped tip is further lowered below a predetermined depth D from the upper end of the body part 10.

The asymmetric concave flange 23 'is deflected to one side from the center of the body portion 10 and is directed to the opposite side to the other side so that the protrusion length L is shortened. The opposite side of the front end is formed with a cut surface 23a It is possible.

The asymmetric concave flange 23 'shown in FIG. 4 is formed such that the groove 301 is formed on one side of the alveolar bone 300 in the direction of the ball or tongue so that the width Wb of the alveolar bone 300 It is possible to perform the implant operation directly without a separate bone grafting step to increase the bone width.

5 shows, in another embodiment, a perspective view of the implant fixture 102 with a cut concave flange 23 "and a top view of the head portion 20 ".

The cut concave flange 23 "has a cut surface 23b cut at a predetermined portion on both sides facing the concave flange 23 " having the feature of the concave flange described above (the concave groove is symmetrical with the body portion as the central axis) The edge except the cut surface 23b has an arc type tip structure protruding downward.

Also, it is preferable that the end of the arc-shaped tip is further lowered below a predetermined depth D from the upper end of the body 10.

The cut concave flange 23 '' has an arc-shaped tip projecting downward from both sides with respect to the body 10 and the rest faces the cut surface 23b. Therefore, as shown in FIG. 6 (d) Even if the widths Wb of the alveolar bone 300 become very small due to the presence of the grooves 301 and 302 on both sides of the alveolar bone 300 in the direction of the tongue, There will be advantages.

In the above-described embodiments, it is preferable that the length L protruding to the side of each concave flange 23, 23 ', 23 "is 0.1 to 0.5 mm. The stress dispersing ability of the head portions 20, 20 ', 20 "is deteriorated, and it is impossible to expect the role as an anchor to the edge of the concave flange. 6 (a), the concave flange 23 of the implant fixture 100 and the alveolar bone 22b of the alveolar bone of the implant fixture 100, There is a problem that it is difficult to secure an allowance width Wf between the side surfaces of the side walls 300 of 0.5 mm or more. However, as in the embodiment of the integrated implant fixture 104 shown in FIG. 7 (b), the upper end width W of the body 10 may be 4 mm or less. The most preferable protrusion length L is 0.35 mm.

1, the concave groove 21 is composed of an inner curved surface 21a and an outer curved surface 21c with respect to the ceiling 21b, and curvature radii of the two curved surfaces are set to be different from each other Can be different. This makes it possible to adjust the side projecting length L of the concave flange 23, the space portion of the concave groove 21 and the edge structure of the concave flange 23, that is, the downward projecting length and angle of the tip .

For example, as shown in FIG. 1, the curvature radius of the outer curved surface 21c may be larger than the curvature radius of the inner curved surface 21a. That is, when the radius of curvature of the inner curved surface 21a is R1, the radius of curvature of the outer curved surface 21c has a value between R2 and R3 larger than R1, so that the lateral protruding length L And the space portion of the concave groove 21 can be further secured.

The height H of the ceiling 21b of the concave groove 21 where the inner curved surface 21a and the outer curved surface 21c meet is preferably 0.05 to 0.25 mm from the upper end of the body portion 10 Do. This is determined in consideration of the curvature radius R1 of the inner curved surface 21a and the side projected length L of the concave flange 23 described above. The height H of the most preferable ceiling 21b is 0.1 mm.

As described above, the ceiling 21b of the concave groove 21 is a portion where the inner curved surface 21a and the outer curved surface 21c meet. Therefore, in the plan view of the head portion 20 in Fig. 1, the circular ceiling line 21b and is located at a position spaced a certain distance Lm from the upper end of the body 10 in a perspective view of the implant fixture 100. [ 4 and 5, the position of the ceiling 21b of the concave groove 21 can be grasped in the same manner.

While the preferred embodiments of the present invention have been described with reference to the accompanying drawings, it is to be noted that the technical spirit of the present invention is not limited to the structure of the accompanying drawings. In addition, the contents generally known in relation to the implant fixture should be regarded as being omitted. Therefore, the present invention is not limited to the interpretation of the technical idea of the present invention.

10: body part 12, 14: threaded part
20, 20 ', 20 ": head portion 21: concave groove
22: upper surface of head portion 23: concave flange
24: hexagonal fastening groove 25: upper face of the concave flange
26: hexagonal protrusion 28: abutment
100, 101, 102, 103, 104: Implant fixture
200: cancellous bone 300: cortical bone
310: Alveolar bone hole 400: Gum

Claims

And a head portion formed on an upper end of the body portion. The implant fixture includes a body portion having an outer surface formed with a thread and inserted into the alveolar bone,
Wherein the head portion has a concave flange protruding a predetermined length from a side surface thereof,
Wherein the concave flange has a concave groove formed in a lower surface thereof,
Wherein the concave groove is formed symmetrically with the body part as a central axis.

The method according to claim 1,
Wherein the concave groove is formed between an upper end of the body portion and an edge of the concave flange,
Wherein an upper surface of the concave flange is symmetrical with respect to a center axis of the body portion and is inclined downward toward an edge.

3. The method of claim 2,
The edge of the concave flange is a circular tip protruding downward,
Wherein an end of the circular tip is further lowered below a predetermined depth from an upper end of the body portion.

3. The method of claim 2,
Wherein an edge of the concave flange is a horseshoe tip protruding downwardly toward one side,
Wherein a front end of the horseshoe-shaped tip is further lowered below a predetermined depth from an upper end of the body portion.

3. The method of claim 2,
Wherein the concave flange has a cut surface cut at a predetermined distance on opposite sides of the concave flange and an edge except for the cut surface forms an arc tip protruding downward,
And an end of the arc-shaped tip is further lowered from the upper end of the body part to a certain depth below the implant.

6. The method according to any one of claims 1 to 5,
Wherein the protruding length of the side surface of the concave flange is 0.1 to 0.5 mm.

The method according to claim 6,
Wherein the concave groove has a curvature radius different from that of an inner curved surface and an outer curved surface with respect to a ceiling.

8. The method of claim 7,
Wherein the curvature radius of the outer curved surface is larger than the curvature radius of the inner curved surface,
And the height of the ceiling of the concave groove is 0.05 to 0.25 mm from the upper end of the body part.