KR20240011479A - Abutment assembly - Google Patents

Abstract

One embodiment of the present invention is an implant that is installed in the alveolar bone and has a threaded portion on the inner peripheral surface of a central hole, a base portion in which a screw hole provided with a female thread portion is formed in the center, and a protrusion that protrudes upward from the top of the base portion along the screw hole. and an abutment extending from the lower part of the base portion and having a coupling portion inserted into a central hole and fastened to the inner peripheral thread portion, and coupled to the abutment to prevent rotation relative to the abutment, separated by an incision slit, and penetrating through the center of the crown. An abutment assembly is provided, including a connection portion in which an elastic portion is formed that is elastically deformed in a radial direction when inserted into a hole and is compressed against the inner peripheral surface of a crown.

Description

Abutment assembly {ABUTMENT ASSEMBLY}

The present invention relates to an abutment assembly, and more specifically, to an abutment assembly that prevents loosening of an abutment and a crown through a connection portion without using dental cement.

In general, an abutment assembly refers to an artificial replacement that is constructed to reproduce the same form and function as a natural tooth. An implant made of titanium that imitates the root shape of a natural tooth to be installed in the alveolar bone with threads formed on the outer circumferential surface. It includes an abutment connected to and installed on the top of the implant and an artificial tooth coupled thereto, and a fixing screw for fixing the implant and the abutment to each other.

Methods for joining an abutment to a prosthesis, which is an artificial tooth, largely include the screw fastening method and the cement bonding method.

First, in the case of the screw fastening method, a prosthesis that is integrated with an abutment is fastened to an implant embedded in the alveolar bone with a screw, but it has the disadvantage that there is a possibility of deformation due to shrinkage during casting of the prosthesis.

In addition, the cement bonding method involves first fastening the abutment to the implant and then bonding the prosthesis to the upper surface of the abutment with dental cement. However, in the cement adhesion method, it takes a lot of time to remove the cement exposed to the outside of the crown, and even if the tooth is removed cleanly, the cement in the crown melts and leaks into the patient's oral cavity, which can cause gingival inflammation and furthermore, the implant There is a problem that may be eliminated.

The present invention is intended to solve the problems of the prior art described above, and the purpose of the present invention is to provide an abutment assembly that can fix a prosthesis and an abutment without using dental cement.

One aspect of the present invention is an implant that is installed in the alveolar bone and has a threaded portion on the inner peripheral surface of a central hole, a base portion in which a screw hole provided with a female thread portion is formed in the center, a protrusion protruding upward along the screw hole from the upper part of the base portion, and An abutment extending from the lower part of the base part and having a coupling part inserted into the central hole and fastened to the inner peripheral thread part and coupled to the abutment to prevent rotation relative to the abutment, separated by a cut slit and a through hole in the center of the crown. An abutment assembly is provided, including a connection portion in which an elastic portion is formed that is elastically deformed in the radial direction when inserted into the crown and is compressed against the inner peripheral surface of the crown.

In one embodiment, a polygon-shaped insertion portion protrudes from the upper center of the protrusion, and a lower portion of the insertion hole of the connection portion may be formed as a polygonal groove corresponding to the insertion portion.

In one embodiment, one or more anti-rotation protrusions protruding in the radial direction are formed on the outer circumferential surface of the elastic part, and one or more anti-rotation protrusions to which the anti-rotation protrusions are coupled are formed recessed on the inner circumferential surface of the crown in contact with the outer circumferential surface of the elastic part. You can.

In one embodiment, a groove that is depressed inward in the radial direction may be formed on the outer peripheral surface of the elastic part.

In one embodiment, the lower portion of the protrusion may be formed in a polygonal shape, and the lower portion of the insertion hole of the connection portion may be formed as a polygonal groove corresponding to the protrusion.

In one embodiment, a cutting surface formed perpendicular to the radial direction of the insertion hole is formed on the elastic part, and a rotating surface formed perpendicular to the radial direction of the through hole corresponding to the cutting surface is formed on the inner circumferential surface of the crown in contact with the outer peripheral surface of the elastic part. A bump may be formed.

According to one aspect of the present invention, the crown can be firmly coupled to the abutment without dental cement by the coupling structure between the implant, abutment, link, crown, and screw, thereby reducing inflammation caused by dental cement. It has the advantage of being able to relieve triggers.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the configuration of the invention described in the detailed description or claims of the present invention.

Figure 1 is a perspective view of an abutment assembly according to a first embodiment of the present invention.
Figure 2 is an exploded perspective view of Figure 1.
Figure 3 is a perspective view and cross-sectional view of a connection part according to the first embodiment of the present invention.
Figure 4 is a cross-sectional view of Figure 1.
Figure 5 is an exploded perspective view of an abutment assembly according to a second embodiment of the present invention.
Figure 6 is a perspective view and cross-sectional view of a connection part according to a second embodiment of the present invention.
Figure 7 is a cross-sectional view of an abutment assembly according to a second embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention may be implemented in various different forms and, therefore, is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be “connected” to another part, this includes not only cases where it is “directly connected,” but also cases where it is “indirectly connected” with another member in between. . Additionally, when a part is said to “include” a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

As used herein, terms containing ordinal numbers such as 'first' or 'second' may be used to describe various components or steps, but the components or steps should not be limited by the ordinal numbers. . Terms containing ordinal numbers should be interpreted only to distinguish one component or step from other components or steps.

FIG. 1 is a perspective view of the abutment assembly 100 according to the first embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a perspective view and cross-sectional view of the connection portion according to the first embodiment of the present invention. , and Figure 4 is a cross-sectional view of Figure 1.

Hereinafter, the abutment assembly 100 according to the first embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

The abutment assembly 100 according to the first embodiment of the present invention includes an implant 110, an abutment 120, and a connection portion 130.

The implant 110 is formed to have the root shape of a natural tooth to serve as a root. In addition, a central hole 111 is formed in the center of the implant 110, an inner peripheral threaded portion 112 is installed at the bottom of the central hole 111, and a lower screw s is coupled to the inner peripheral threaded portion 112. A threaded portion 113 is formed on the outer peripheral surface of the implant 110, and the implant 110 is inserted and coupled to the inside of the alveolar bone.

At the center of the abutment 120, a screw hole 121 having a female thread 122 is sunk to a predetermined depth. In addition, the abutment 120 is configured to include a base portion 123, a protruding portion 124, and a coupling portion 125.

The outer peripheral surface of the base portion 123 is formed in a tapered shape with a diameter gradually narrowing toward the bottom, and the lower surface (c6) of the crown (c) is formed around the base surface (123a), which is the upper surface of the base portion (123). ) is supported, and a protrusion 124 is formed inside the base surface 123a to protrude upward.

The outer peripheral surface of the protrusion 124 is formed in the shape of a truncated cone whose diameter gradually increases toward the bottom, and the outer peripheral surface of the protrusion 124 faces the support surface (c3) of the crown (c).

An insertion portion 125 that engages the polygonal groove 135 of the connection portion 130 protrudes from the upper portion of the protrusion 124. The insertion part 125 is formed in the shape of a polygonal pillar and can be coupled to the polygonal groove 135 of the connection part 130 of the abutment 120 so that the insertion part 125 is not relatively rotated. The cross section of the insertion portion 125 may be formed in a hexagonal shape, but is not limited thereto, and may be formed in a square or octagonal pillar shape corresponding to the shape of the polygonal groove 135.

A coupling portion 126 that is fastened to the threaded portion 112 of the inner peripheral surface of the implant 110 extends from the lower portion of the base portion 123. A male threaded portion 127 is formed on the outer peripheral surface of the coupling portion 126 and engaged with the inner peripheral threaded portion 112.

The connection portion 130 is for fastening the crown (c) to the abutment 120 without using cement, and an insertion hole 131 is formed in the center that is aligned with the through hole (c1) of the crown (c). .

The connection portion 130 is formed to have a longitudinal cut slit 132 and an elastic portion 133 separated by the cut slit 132. In detail, the cutting slit 132 is recessed in the axial direction from the upper end of the connecting portion 130 to the center, and accordingly, the elastic portion 133 can be elastically deformed in the radial direction.

Accordingly, the elastic portion 133 can be elastically fitted to the contact surface c4 of the crown c, and when occlusal force is applied during mastication of food, each elastic portion 133 deforms and restores along the radial direction. By repeating, the occlusal force is cushioned.

That is, the crown (c) is elastically coupled to the elastic portion 133 and can be semi-permanently coupled to the abutment 120 through the connecting portion 130.

The cutting slits 132 may be arranged to be spaced apart from each other to form an equal angle between adjacent cutting slits 132 along the circumferential direction of the connection portion 130. For example, the cutting slits 132 may be spaced apart at intervals of 90 degrees, and a total of four elastic portions 133 may be formed. The number of cutting slits 132 is not limited to this.

A groove 134 is formed near the center of the outer peripheral surface of the elastic portion 133. The groove 134 is recessed radially inward with respect to the insertion hole 131, and extends along the circumference of the outer peripheral surface of the elastic portion 133 to form an overall ring shape. The elastic portion 133 is formed relatively thin near the groove 134, so that it can be more flexibly deformed radially outward or inward.

Meanwhile, the inner diameter of the elastic portion 133 may be slightly smaller than the outer diameter of the screw (s) extension portion. In this case, when the extension portion s3 of the screw s is inserted into the insertion hole 131 and lateral pressure is applied to the elastic portion 133, the elastic portion 133 is between the screw s and the crown c. , For example, between the extension portion (s3) of the screw (s) and the contact surface (c4) of the crown (c), elastic compression is performed to bind the screw (s) and crown (c) more firmly. .

The lower end of the connection part 130 is located on the upper side of the protrusion 124 of the abutment 120, and the lower part of the insertion hole 131 may be formed of a polygonal groove 135 corresponding to the polygonal pillar of the insertion part 125. . The polygonal groove 135 is not limited to a hexagonal groove shape, and may be formed in a square groove shape or an octagonal groove shape. When the polygonal groove 135 is aligned and inserted into the insertion portion 125 of the abutment 120, the connection portion 130 may be coupled to the abutment 120 so as not to rotate relative to it.

Rotation prevention protrusions 136 may be formed on some of the plurality of elastic parts 133 of the connection part 130. For example, a rotation prevention protrusion 136 protruding outward in the radial direction may be formed on one side of the outer peripheral surface of the elastic portion 133. The connecting portion 130 is inserted upward from below the through hole (c1) of the crown (c), and when the anti-rotation protrusion 136 is aligned and coupled to the anti-rotating portion (c5) of the crown (c), the connecting portion (130) Relative rotation of and crown (c) can be prevented.

Meanwhile, the crown (c) forms the appearance of an artificial tooth and can be custom-processed through a CAD or CAM system based on a library registered in a dental laboratory. The crown (c) is preferably made of zirconia.

A through hole (c1) is formed in the center of the crown (c).

A locking portion (c2) protruding toward the center is formed at the center of the through hole (c1) of the crown (c). The catching portion (c2) is a portion of the through hole (c1) with the smallest inner diameter, and when the screw (s) is inserted into the through hole (c1) and fastened to the female thread portion (122) of the abutment (120), , the tapered portion s2 of the screw s is supported by the locking portion c2, so that the crown c can be supported more firmly on the abutment 120.

A support surface (c3) facing the outer peripheral surface of the protrusion 124 is formed at the bottom of the through hole (c1), and a contact surface (c4) where the elastic part 133 is in contact is between the locking part (c2) and the support surface (c3). This is formed. Preferably, the inner diameter of the contact surface c4 may be slightly smaller than the outer diameter of the elastic portion 133. In this case, when the elastic portion 133 of the connection portion 130 is inserted into the through hole c1 of the crown c1 and passes through the contact surface c4, it is slightly reduced inward in the radial direction and then elasticity acts on the crown ( The contact surface (c4) of c) is compressed.

A rotation prevention portion (c5) to which the rotation prevention protrusion 136 of the connection portion 130 is coupled may be formed by being depressed on the contact surface (c4). At this time, to facilitate the coupling of the rotation prevention protrusion 136 and the rotation prevention part (c5), a pair of rotation prevention parts (c5) are formed to face each other at an interval of 180 degrees around the central axis of the crown (c). You can.

The screw (s) passes through the through hole (c1) of the crown (c), the insertion hole (131) of the connection portion (130), and the screw hole (121) of the abutment (120) of the abutment (120). It is coupled to the female thread portion 122 and consists of a head portion (s1), a tapered portion (s2), and an extension portion (s3).

A driver groove may be formed on the head s1 so that a dental driver can be inserted into the upper surface and rotated. The driver groove is provided with six grooves that are recessed at regular intervals along the circumferential direction on the inner wall of the head s1, into which a hexagonal dental driver is inserted. However, it is not limited to this, and the driver groove may be formed with a different number of grooves to correspond to a triangular, square, or pentagonal shaped dental driver.

The tapered portion s2 is a portion that connects the head portion s1 and the extension portion s3, and may be formed so that its diameter gradually decreases toward the lower end. When the screw (s) is inserted into the through hole (c1) of the crown (c) and fastened to the abutment (120), the tapered portion (s2) is supported by the locking portion (c2) of the crown (c) and is attached to the crown (c). ) is supported more firmly on the screw (s).

The extension portion s3 has the shape of a cylinder extending longitudinally from the tapered portion s2, and a male thread portion s4 fastened to the female thread portion 122 of the abutment 120 is formed at the lower portion of the outer peripheral surface.

Below, the assembly process of the abutment assembly 100 according to the first embodiment of the present invention will be described in detail.

First, the abutment 120 is inserted into the center hole of the implant 110 installed in the alveolar bone, and the coupling portion 125 of the abutment 120 is fastened to the inner peripheral thread portion 112 of the implant 110. Then, the abutment 120 is fixed to the implant 110.

Next, the connecting portion 130 is inserted upward from below the through hole (c1) of the crown (c) so that the anti-rotation protrusion (136) is aligned with the anti-rotation portion (c5) of the crown (c). It is elastically coupled to the contact surface (c4). Then, the polygonal groove 135 of the connecting portion 130 and the insertion portion 125 of the abutment 120 are aligned to seat the crown (c) on the base surface 123a of the abutment 120.

Thereafter, the screw (s) is passed through the through hole (c1) of the crown (c), the insertion hole (131) of the connection portion (130), and the screw hole (121) of the abutment (120) to insert the abutment (120). ), the elastic portion 133 of the connecting portion 130 is spread outward by the extension portion s3 of the screw s, causing a gap between the connecting portion 130 and the crown c. The bond becomes stronger.

As such, according to the abutment assembly 100 according to the first embodiment of the present invention, the implant 110, the abutment 120, the connection portion 130, the crown (c), and the screw (s) are connected to each other. Due to the coupling structure, the crown (c) can be firmly coupled to the abutment 120 without dental cement, which has the advantage of eliminating inflammation caused by dental cement.

Figure 5 is an exploded perspective view of the abutment assembly 200 according to the second embodiment of the present invention, Figure 6 is a perspective view and cross-sectional view of the connection part according to the second embodiment of the present invention, and Figure 7 is the second embodiment of the present invention. This is a cross-sectional view of the abutment assembly 200 according to Example 2.

Hereinafter, the abutment assembly 200 according to the second embodiment of the present invention will be described in detail with reference to FIGS. 5 to 7.

The second embodiment differs from the first embodiment in the shape of the connection portion 230. The parts that overlap with the first embodiment will be omitted, and the second embodiment of the present invention will be described. Identical and similar members are assigned identical and similar symbols, and detailed descriptions thereof are omitted.

The outer peripheral surface of the protrusion 224 of the abutment 220 is formed in the shape of a truncated cone whose diameter gradually increases toward the bottom, and the outer peripheral surface of the protrusion 224 faces the inner peripheral surface of the connection portion 230.

A rotation prevention surface 225 may be formed at the bottom of the outer peripheral surface of the protrusion 224. The rotation prevention surface 225 is made of a surface perpendicular to the radial direction of the screw hole 221. In detail, the rotation prevention surface 225 may be depressed at regular intervals along the circumferential direction so that the cross-section of the bottom of the protrusion 224 may be formed as a polygon, but is not limited thereto, and the polygonal groove 235 of the connection portion 230 Depending on the shape, various shapes can be applied.

A plurality of grooves 234a and 234b may be formed in the elastic portion 233 at the top of the connection portion 230. The first groove 234a in the lower part of the elastic part 233 and the second groove 234b in the upper part of the elastic part 233 are each recessed inward in the radial direction, and extend along the circumference of the outer peripheral surface of the elastic part 233 to form an overall ring. It can be formed in the shape of. The elastic portion 233 is formed to be relatively thin near the grooves 234a and 234b, so that it can be more flexibly deformed radially outward or inward.

A cutting surface 236 may be formed on the plurality of elastic parts 233 of the connection part 230. For example, the cut surface 236 is formed in a shape in which the elastic portions 233 adjacent to the cut slit 232 are cut in a tangential direction of the cut slit 232. Preferably, the cut surface 236 is spaced at intervals of 180 degrees. can be formed to face each other.

The connection portion 230 includes an extension portion 237 extending downward along the insertion hole 231, and the extension portion 237 may be formed in the shape of a truncated cone whose diameter gradually increases downward. A support portion 238 supported by the base surface 223a of the abutment 220 is formed at the bottom of the extension portion 237, and the upper surface of the support portion 238 is formed with a bottom surface c6 of the crown c. This is supported.

A rotation stopper c7 may be formed on the contact surface c4 of the crown c, which is aligned to face the cut surface 236 of the connection portion 230. The rotation stopper c7 is formed in a planar shape perpendicular to the radial direction of the through hole c1. Accordingly, when the cut surface 236 is aligned and inserted into the rotation stopper c7, the connection portion 230 can be coupled to the crown c so as not to rotate relative to it.

The description of the present invention described above is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present invention is indicated by the claims described below, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention.

100, 200 abutment assembly
110 implant
120, 220 abutment
130, 230 connection
c crown
s screw

Claims (6)

An implant that is installed in the alveolar bone and has a threaded portion when placed in a central hole;
A base portion in which a screw hole provided with a female thread is formed in the center, a protrusion protruding upward from the upper part of the base portion along the screw hole, and a coupling portion that extends from the bottom of the base portion and is inserted into the central hole and fastened to the screw portion of the inner peripheral surface. An abutment provided; and
A connecting portion coupled to the abutment to prevent relative rotation, separated by a cut slit, and forming an elastic portion that is elastically deformed in the radial direction when inserted into the through hole in the center of the crown and pressed against the inner peripheral surface of the crown; Containing an abutment assembly. According to claim 1,
A polygonal-shaped insert protrudes from the upper center of the protrusion,
An abutment assembly wherein the lower part of the insertion hole of the connection part is formed with a polygonal groove corresponding to the insertion part. According to claim 1,
An abutment assembly, wherein one or more anti-rotation protrusions protruding in the radial direction are formed on the outer circumferential surface of the elastic part, and one or more anti-rotation protrusions to which the anti-rotation protrusions are coupled are recessed on the inner circumferential surface of the crown in contact with the outer circumferential surface of the elastic part. According to claim 1,
An abutment assembly in which a groove that is recessed in a radial direction is formed on the outer peripheral surface of the elastic portion. According to claim 1,
The lower part of the protrusion is formed in a polygonal shape,
An abutment assembly wherein the lower part of the insertion hole of the connection part is formed with a polygonal groove corresponding to the protrusion. According to claim 5,
A cutting surface formed perpendicular to the radial direction of the insertion hole is formed on the elastic part, and a rotation stop is formed on the inner peripheral surface of the crown in contact with the outer peripheral surface of the elastic part, corresponding to the cutting surface, and formed perpendicular to the radial direction of the through hole. Abutment assembly.

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