Abutment Assembly

Abstract

One embodiment of the present invention provides an abutment assembly comprising: a lower connecting portion having a first through-hole extending vertically in the center, a first lower groove formed on the inside to prevent rotation relative to the abutment, and an anti-rotation portion formed on the outside to prevent rotation relative to the crown; and an upper connecting portion having a third through-hole extending vertically in the center, which is inserted into the through-hole of the crown and coupled to the lower connecting portion.

Description

Technical Field

[0001] The present invention relates to an abutment assembly.

Background Art

[0002] Generally, an abutment assembly means an artificial substitute configured to reproduce the same shape and function as natural teeth, including an implant that imitates the root shape of natural teeth with a thread formed on its outer peripheral surface and is installed in the alveolar bone, an abutment that is connected and installed on the upper part of the implant and has an artificial tooth bonded to its upper part, and a fixing screw that fixes the implant and the abutment to each other.

[0003] As a method of bonding a prosthesis, which is an artificial tooth, to an abutment, there are roughly a screw fastening method, a cement bonding method, and a bonding method that mixes screw fastening and cement bonding and uses them.

[0004] First, in the case of the screw fastening method, it is a method of fastening a prosthesis that is integral with the abutment to an implant implanted in the alveolar bone with a screw, but it has a disadvantage that deformation due to shrinkage may occur during casting of the prosthesis.

[0005] Also, the cement bonding method is a method of 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 bonding method, it takes a lot of time to remove the cement exposed outside the crown, and even if this is removed cleanly, the cement inside the crown may melt and leak into the patient's oral cavity, inducing gum inflammation, and furthermore, the implant may fall off. Also, the hybrid fastening method that uses both screw fastening and cement fastening has problems such as the problem of screw loosening and the induction of gum inflammation due to the remaining cement.

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention aims to solve the problems of the prior art described above, and the object of the present invention is to provide an abutment assembly with a structure that can prevent loosening after the crown is fastened to the abutment without using dental cement. [Means for solving the problem]

[0007] One aspect of the present invention provides an abutment assembly comprising: a lower connecting portion having a first through-hole extending vertically in the center, a first lower groove formed on the inside so as to prevent rotation relative to the abutment, and a rotation prevention portion formed on the outside so as to prevent rotation relative to the crown; and an upper connecting portion having a third through-hole extending vertically in the center, which is inserted into the through-hole of the crown and connected to the lower connecting portion.

[0008] In one embodiment, the crown may further include a second through-hole extending vertically in the center, and a second lower groove formed below the second through-hole into which the anti-rotation portion of the lower connecting portion is inserted and joined.

[0009] In one embodiment, the second lower groove of the crown includes a circular coupling surface to which the anti-rotation portion is coupled, and the coupling surface has one or more flat portions formed perpendicular to the radial direction of the second lower groove, and the anti-rotation portion may include one or more anti-rotation surfaces cut and formed corresponding to the flat portions.

[0010] In one embodiment, the second lower groove of the crown includes a circular coupling surface to which the anti-rotation portion is coupled, the coupling surface has a recess formed therein, and the anti-rotation portion may include a projection corresponding to the recess.

[0011] In one embodiment, the second through-hole of the crown is provided with a stepped portion, and the upper connecting portion may include an upper support portion that is locked and supported by the stepped portion of the crown, and a connecting portion that extends from the lower part of the upper support portion and is coupled to the first through-hole.

[0012] In one embodiment, the connecting portion is formed with a circular cross-section, and the connecting portion is press-fitted into the first through-hole of the lower connecting portion so that its outer surface is in close contact with the inner surface of the first through-hole.

[0013] In one embodiment, the abutment may further include a second internal groove having a second internal threaded portion in the center, a lower portion that supports the lower part of the lower connecting portion, and an upper portion that protrudes upward from the lower portion and connects to the first lower groove.

[0014] In one embodiment, the first lower groove may include an anti-rotation groove to which the upper portion is coupled.

[0015] In one embodiment, the first lower groove may be formed in a shape corresponding to the outer surface of the upper portion.

[0016] In one embodiment, the anti-rotation groove is formed as a polygonal groove, and a polygonal portion corresponding to the anti-rotation groove may be formed on the upper part of the upper side.

[0017] In one embodiment, the screw may further include a screw that is supported on the upper surface of the upper connecting portion and has an outer surface threaded portion formed at its lower end, which is fastened to the second inner surface threaded portion of the abutment.

[0018] One aspect of the present invention provides an abutment assembly comprising: an implant implanted in alveolar bone and having a first internal groove with a first internal threaded portion formed thereon; an abutment having a second internal groove with a second internal threaded portion in the center, a lower portion inserted into the first internal groove and fastened to the first internal threaded portion, and an upper portion protruding upward from the lower portion; a crown having a second through-hole extending vertically in the center and a second lower groove below the second through-hole; a lower connecting portion having a first through-hole extending vertically in the center, a first lower groove formed on the inside to connect the upper portion of the abutment so as to prevent relative rotation, and an anti-rotation portion formed on the outside to connect to the second lower groove of the crown so as to prevent relative rotation; and an upper connecting portion having a third through-hole extending vertically in the center, which is inserted into the second through-hole of the crown and connected to the lower connecting portion. [Effects of the Invention]

[0019] According to one aspect of the present invention, the bonding structure between the implant, abutment, lower connector, crown, upper connector, and screw allows the crown to be firmly bonded to the abutment without dental cement, thereby eliminating the inflammation induced by dental cement.

[0020] The effects of the present invention are not limited to those described above, but should be understood to include all effects that can be inferred from the detailed description of the invention or the configuration of the invention as described in the claims. [Brief explanation of the drawing]

[0021] [Figure 1] This is a perspective view of an abutment assembly according to one embodiment of the present invention. [Figure 2] This is an exploded view of an abutment assembly according to one embodiment of the present invention. [Figure 3] This is a cross-sectional view of an abutment assembly according to one embodiment of the present invention. [Figure 4a-b]These are respectively a perspective view and a cross-sectional view of an implant according to an embodiment of the present invention. [Figure 5a-b] These are respectively a perspective view and a cross-sectional view of an abutment according to an embodiment of the present invention. [Figure 6a-c] These are respectively a perspective view, a plan view, and a cross-sectional view of a lower connecting part according to an embodiment of the present invention. [Figure 7a-c] These are respectively a perspective view, a plan view, and a cross-sectional view of a crown according to an embodiment of the present invention. [Figure 8a-b] These are respectively a perspective view and a cross-sectional view of an upper connecting part according to an embodiment of the present invention. [Figure 9a-c] These are respectively a perspective view, a plan view, and a cross-sectional view of an upper connecting part according to another embodiment of the present invention. [Figure 10a-b] These are respectively a perspective view and a cross-sectional view of a screw according to an embodiment of the present invention. [Figure 11-12] This is a view showing the assembly process of an abutment assembly according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0022] Hereinafter, the abutment assembly of the present invention will be described in detail.

[0023] FIG. 1 is a perspective view of an abutment assembly according to an embodiment of the present invention. FIG. 2 is an exploded view of the abutment assembly according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the abutment assembly according to an embodiment of the present invention.

[0024] Referring to FIGS. 1 to 3, the abutment assembly 1000 is composed of an implant 100, an abutment 200, a lower connecting part 300, a crown 400, an upper connecting part 500a, and a screw 600.

[0025] FIGS. 4a and 4b are respectively a perspective view and a cross-sectional view of an implant according to an embodiment of the present invention.

[0026] Referring to Figures 2, 3, 4a, and 4b, the implant 100 is formed to have the shape of a natural tooth root so as to function as a root. A first internal groove 110 is formed in the center of the implant 100, and a first inner circumferential threaded portion 120 is installed below the first internal groove 110, to which the second outer circumferential threaded portion 220 of the abutment 200 is connected. A first outer circumferential threaded portion 130 is formed on the outer circumferential surface of the implant 100, and the implant 100 is inserted and connected to the inside of the alveolar bone.

[0027] Figures 5a and 5b are perspective and cross-sectional views of an abutment according to one embodiment of the present invention, respectively.

[0028] Referring to Figures 2, 3, 5a, and 5b, the abutment 200 is coupled to the implant 100 to support the lower connector 300 and the crown 400, and a second internal groove 240 is formed on the upper end surface so that the screw 600 can be coupled to it.

[0029] Furthermore, the abutment 200 is composed of a lower portion 210, a second outer circumferential threaded portion 220, and an upper portion 230.

[0030] The lower portion 210 is inserted into the first internal groove 110 of the implant 100, and the outer circumferential surface of the lower portion 210 may be formed in a tapered shape, with the diameter gradually narrowing towards the bottom. The lower end surface 321 of the lower connecting portion 300 may be supported on the upper surface 211 of the lower portion 210.

[0031] The second outer circumferential threaded portion 220 is formed extending below the lower portion 210, and its outer circumferential surface is provided with threads that fasten to the first inner circumferential threaded portion 120 of the implant 100.

[0032] The upper portion 230 protrudes from the upper part of the lower portion 210 to the outside of the implant 100. The upper portion 230 has a circular cross-section and can be formed in a pyramidal shape, with the outer diameter narrowing towards the top.

[0033] A polygonal portion 231 may protrude from the upper part of the upper portion 230.

[0034] A second inner circumferential threaded portion 241 is installed inside the second internal groove 240 of the abutment 200, and a screw 600 is fastened to the second inner circumferential threaded portion 241.

[0035] Figures 6a to 6c are a perspective view, a plan view, and a cross-sectional view of the lower connecting portion according to one embodiment of the present invention, respectively.

[0036] Referring to Figures 2, 3, and 6a to 6c, the lower connecting portion 300 is connected to the upper connecting portion 500a to connect the abutment 200 and the crown 400, and may be made of a metal material such as titanium, but is not limited to this.

[0037] The lower connecting portion 300 and the upper connecting portion 500a are fastened to the abutment 200 while connected to the crown 400. The lower connecting portion 300 includes a rotation prevention portion 310 that is connected to the crown 400 to prevent relative rotation, a lower support portion 320 that is supported by the abutment 200, and a first lower groove 340 that is connected to the abutment 200 to prevent relative rotation. A first through hole 330 extending vertically is formed in the center of the lower connecting portion 300.

[0038] The anti-rotation portion 310 is formed on the outside of the lower connecting portion 300 and is coupled to the second lower groove 410, preferably the coupling surface 412, of the crown 400. One or more anti-rotation surfaces 311 may be formed on the anti-rotation portion 310. The anti-rotation surfaces 311 may be formed in a shape in which one side of the outer circumferential surface of the anti-rotation portion 310 is cut vertically. Such anti-rotation surfaces 311 may be aligned with a flat portion 413 formed on the coupling surface 412 of the crown 400. That is, when the anti-rotation surfaces 311 are aligned with and coupled to the flat portion 413, relative rotation of the crown 400 with respect to the lower connecting portion 300 can be prevented.

[0039] In exemplary embodiments, the lower connecting portion 300 and the crown 400 can also be joined to each other via a recessed or concave-concave configuration. For example, the outer surface of the anti-rotation portion 310 may have a projection (not shown) that protrudes radially outward, and the connecting surface 412 may have a recess (not shown) corresponding to the projection.

[0040] On the other hand, the lower support portion 320 extends downward from the lower part of the anti-rotation portion 310, and its cross-section may be circular. The lower end surface 321 of the lower support portion 320 may be supported by the upper surface 211 of the lower portion 210 of the abutment 200.

[0041] Multiple grooves 322 may be formed on the outer surface of the lower support portion 320 along the circumferential direction.

[0042] In an exemplary embodiment, one of the multiple grooves 322 may be formed in the same direction as the anti-rotation surface 311 of the anti-rotation portion 310. When the anti-rotation portion 310 of the lower connecting portion 300 enters the second lower groove 410 of the crown 400, the alignment of the anti-rotation surface 311 of the lower connecting portion 300 and the flat portion 413 of the crown 400 cannot be visually confirmed and may vary during the entry process. In this case, if one of the grooves 322 is formed in the same direction as the anti-rotation surface 311, the alignment of the anti-rotation surface 311 and the flat portion 413 of the crown 400 can be visually confirmed through the groove 322.

[0043] A first lower groove 340 is formed on the inner lower part of the lower connecting portion 300, and a first through hole 330 is formed in the center, communicating with the first lower groove 340 and extending vertically. An inner vertical portion 331 with a circular cross-section and a constant inner diameter may be formed a certain depth below the entrance of the upper end face of the first through hole 330.

[0044] The first lower groove 340 may include an inclined support surface 341 and an anti-rotation groove 342. The inclined support surface 341 has a circular cross-section, but may be formed in a tapered shape where the inner diameter narrows as it goes upward from the lower end of the first lower groove 340. The inclined support surface 341 may be formed at an angle corresponding to the outer surface of the upper portion 230 of the abutment 200.

[0045] The anti-rotation groove 342 is recessed upward by a certain depth from the upper end of the inclined support surface 341 and communicates with the inner vertical portion 331, and can be formed in a polygonal groove shape corresponding to the polygonal portion 231 of the abutment 200.

[0046] In other words, when the anti-rotation groove 342 is aligned with and connected to the polygonal portion 231 of the abutment 200, relative rotation of the lower connecting portion 300 with respect to the abutment 200 can be prevented.

[0047] Figures 7a to 7c are perspective views, plan views, and cross-sectional views of a crown according to one embodiment of the present invention, respectively.

[0048] Referring to Figures 2, 3, and 7a-7c, the crown 400 forms the outline of the artificial tooth and can be custom-made in a dental laboratory via a CAD or CAM system based on a registered library. The crown 400 may, but is not limited to, be made of zirconia material.

[0049] A second lower groove 410 is formed in the lower part of the crown 400, and a second through hole 420 is formed in the center, which communicates with the second lower groove 410 and extends vertically.

[0050] Specifically, the second lower groove 410 may include a receiving groove 411, a coupling surface 412, and a flat surface 413.

[0051] The accommodating groove 411 is recessed upward to a certain depth from the lower end of the second lower groove 410 and may be formed to have an inner diameter that accommodates the entire outer surface of the lower support portion 320 of the lower connecting portion 300. In an exemplary embodiment, the accommodating groove 411 may be formed in a shape corresponding to the outer surface of the lower support portion 320.

[0052] The coupling surface 412 is recessed upward by a certain depth from the upper end of the receiving groove 411 and can be formed in a cylindrical shape. The coupling surface 412 faces the outer surface of the rotation prevention portion 310 of the lower connecting portion 300.

[0053] Furthermore, one or more flat portions 413 may be formed on the joint surface 412 perpendicular to the radial direction of the second lower groove 410. The flat portions 413 may be aligned with the anti-rotation surface 311 of the lower connecting portion 300, thereby preventing relative rotation of the crown 400 with respect to the lower connecting portion 300.

[0054] Furthermore, the second through-hole 420 may be provided with a stepped portion 421 that protrudes radially inward. The upper support portion 510 of the upper connecting portion 500a may be locked to and supported by the stepped portion 421. The upper surface of the stepped portion 421 may be formed as an inclined surface having a downward slope.

[0055] Figures 8a and 8b are perspective and cross-sectional views of the upper connecting portion according to one embodiment of the present invention, respectively.

[0056] Referring to Figures 2, 3, 8a, and 8b, the upper connecting portion 500a has a third through-hole 530 extending vertically in the center and includes an upper support portion 510 and a connecting portion 520a. The upper connecting portion 500a may, but is not limited to, be made of a metallic material such as titanium.

[0057] The upper support portion 510 is formed in a cylindrical shape and has an outer diameter larger than the inner diameter of the stepped portion 421. A portion of the outer surface of the upper support portion 510 may be formed in a tapered shape corresponding to the inclined surface of the stepped portion 421.

[0058] The upper surface of the upper support portion 510 may be provided with a mounting portion 511 whose inner diameter narrows towards the bottom. The head 610 of the screw 600, more specifically the tapered portion 611 formed at the lower end of the head 610, can be securely supported by the mounting portion 511.

[0059] The connecting portion 520a may be formed in a cylindrical shape and have a diameter corresponding to the inner vertical portion 331 of the lower connecting portion 300. In this case, the connecting portion 520a may be joined to the lower connecting portion 300 by a press-fit method, and once the press-fit is complete, the outer surface of the connecting portion 520a and the inner surface of the inner vertical portion 331 of the lower connecting portion 300 will be in close contact with each other, maintaining a strong bond.

[0060] This allows the crown 400 to be detachably fastened to the abutment 200. In other words, since the crown 400 and the abutment 200 can be fastened without using cement, it is possible to prevent the crown 400 from coming loose due to the repulsive force of the gums.

[0061] Furthermore, when an external force is applied, the lower connecting portion 300 and the upper connecting portion 500a absorb and disperse the external force by reproducing fluidity almost identical to the movement of natural teeth through elastic deformation, thereby mitigating the impact applied to the alveolar bone during repeated chewing and embodying the role of a periodontal ligament.

[0062] Figures 9a to 9c are perspective views, plan views, and cross-sectional views of the upper connecting portion according to another embodiment of the present invention, respectively.

[0063] The upper connecting portion 500a mentioned above was connected to the lower connecting portion 300 by a forced press-fit method, but is not limited to this.

[0064] For example, referring to Figures 6 and 9a to 9c, the joint 520b of the upper connecting portion 500b includes at least two or more connecting pieces 521 that are separated by a longitudinal incision groove 522 formed from the upper support portion 510 to the lower end, and can be elastically deformed in the radial direction.

[0065] The incision grooves 522 may be formed along the circumferential direction of the joint 520b, spaced at equal angles between adjacent lower incision grooves 522. For example, the lower incision grooves 522 may be formed spaced 90 degrees apart from each other with respect to the center of the third through-hole 530, thereby allowing the joint 520b to be formed to include a total of four connecting pieces 521. However, the number of lower incision grooves 522 is not limited to this and can be formed in various numbers as needed.

[0066] The connecting portion 520b can be fastened to the first through hole 330 of the lower connecting portion 300 by snap fastening. Specifically, the connecting piece 521 has a diameter corresponding to the inner vertical portion 331 of the first through hole 330. A locking projection 523 projecting radially outward may be formed at the end of the connecting piece 521. Such a locking projection 523 can guide the snap fastening to the lower end of the inner vertical portion 331 of the lower connecting portion 300, i.e., the anti-rotation groove 342.

[0067] In other words, the connecting piece 521 can be elastically contracted and deformed when the locking projection 523 comes into contact with the inner surface of the inner vertical portion 331 during insertion into the first through hole 330. Subsequently, once the insertion of the connecting piece 521 into the first through hole 330 is complete, the locking projection 523 can be elastically restored by passing through the inner vertical portion 331 and settling into the anti-rotation groove 342.

[0068] Figures 10a and 10b are perspective and cross-sectional views of a screw according to one embodiment of the present invention, respectively.

[0069] Referring to Figures 2, 3, 10a, and 10b, the screw 600 passes through the second through-hole 420 of the crown 400 and is coupled to the second inner circumferential threaded portion 241 of the abutment 200, and may, but is not limited to, be made of a metal material such as titanium. The screw 600 includes a head portion 610 and a body portion 620.

[0070] The head 610 may have driver grooves formed on its upper surface so that a dental screwdriver can be fitted and rotated. The driver grooves consist of six grooves formed by recessing from the inner wall of the head 610 at regular intervals along the circumference, so that a hexagonal dental screwdriver can be fitted. However, it is not limited to this, and the driver grooves may be formed with a different number of grooves to accommodate triangular, square, or pentagonal dental screwdrivers.

[0071] A tapered portion 611 may be formed at the lower end of the head 610. The tapered portion 611 is a portion that connects the head 610 and the body 620, and may be formed such that its diameter gradually decreases towards the lower end. When the screw 600 passes through the second through hole 420 of the crown 400 and is fastened to the second inner circumferential threaded portion 241 of the abutment 200, the tapered portion 611 is supported by the anchor portion 511 of the upper connecting portion 500a.

[0072] In this case, the screw 600, which is made of metal, is supported by the anchoring portion 511 of the upper connecting portion 500a, which is also made of metal, thereby improving the frictional force between them and preventing the screw 600 from loosening.

[0073] The body portion 620 has a cylindrical shape that extends longitudinally from the tapered portion 611, and a third outer surface threaded portion 621 is formed on its outer surface, which is partially fastened to the second inner surface threaded portion 241 of the abutment 200.

[0074] Figures 11 and 12 show the assembly process of an abutment assembly according to one embodiment of the present invention.

[0075] The assembly process of the abutment assembly 1000 of the present invention will be described in detail below with reference to Figures 11 and 12.

[0076] First, the abutment 200 is inserted into the implant 100, which has been placed in the alveolar bone, and the abutment 200 is fixed to the implant 100.

[0077] Then, the anti-rotation surface 311 formed on the anti-rotation portion 310 of the lower connecting portion 300 is aligned with the flat portion 413 formed on the coupling surface 412 of the crown 400 and inserted, and the upper connecting portion 500a enters the lower connecting portion 300 through the second through hole 420 of the crown 400. This completes the fastening of the lower connecting portion 300, the crown 400, and the upper connecting portion 500a.

[0078] Next, the lower connecting portion 300 is aligned with the anti-rotation groove 342 and the polygonal portion 231 of the abutment 200 and secured to the upper surface 211 of the abutment 200, thereby completing the temporary fastening between the crown 400 and the abutment 200.

[0079] Subsequently, when the third outer circumferential threaded portion 621 of the screw 600 is passed through the second through hole 420 of the crown 400 and fastened to the second inner circumferential threaded portion 241 of the abutment 200, the tapered portion 611 of the screw 600 is supported by the anchoring portion 521 of the upper connecting portion 500a, thereby making the connection between the lower connecting portion 300, the upper connecting portion 500a, and the crown 400 more robust.

[0080] Thus, according to the abutment assembly 1000 of the present invention, the crown 400 can be firmly bonded to the abutment 200 without dental cement due to the interconnection structure between the implant 100, abutment 200, lower connector 300, crown 400, upper connector 500a, and screw 600, thereby eliminating inflammation caused by dental cement.

[0081] The above description of the present invention is illustrative, and a person with ordinary skill in the art will understand that the invention can be easily modified into other specific forms without altering the technical idea or essential features of the invention. Therefore, the embodiments described above should be understood to be illustrative and not limiting in all respects. For example, each component described in a single form can be implemented in a distributed manner, and similarly, components described as distributed can be implemented in a combined manner.

[0082] The scope of the present invention is defined by the claims described below, and all modifications or variations derived from the meaning and scope of the claims and the concept of equivalents thereof should be interpreted as being included within the scope of the present invention. [Explanation of symbols]

[0083] 1000: Abutment Assembly 100: Implants 200: Abutment 300: Lower connecting section 400: Crown 500a, 500b: Upper connection part 600: Screw

Claims

1. A lower connecting portion is formed in which a first through-hole extending vertically is formed in the center, a first lower groove is formed on the inside to prevent rotation relative to the abutment, and a rotation prevention portion is formed on the outside to prevent rotation relative to the crown, An abutment assembly comprising: an upper connecting portion having a third through-hole extending vertically in the center, which is inserted into the through-hole of the crown and coupled to the lower connecting portion.

2. The abutment assembly according to claim 1, further comprising a crown having a second through-hole extending vertically in the center, and a second lower groove formed at the lower part of the second through-hole into which the anti-rotation portion of the lower connecting portion is inserted and joined.

3. The second lower groove of the crown includes a circular coupling surface to which the anti-rotation portion is coupled, and the coupling surface has one or more flat portions formed perpendicular to the radial direction of the second lower groove. The abutment assembly according to claim 2, wherein the anti-rotation portion includes one or more anti-rotation surfaces that are cut and formed in correspondence with the flat portion.

4. The second lower groove of the crown includes a circular coupling surface to which the anti-rotation portion is coupled, and a recess is formed in the coupling surface. The abutment assembly according to claim 2, wherein the anti-rotation portion includes a protrusion corresponding to the recess.

5. The second through-hole of the crown is provided with a stepped portion. The aforementioned upper connecting portion is The upper support portion is locked and supported by the stepped portion of the crown, The abutment assembly according to claim 2, further comprising a coupling portion extending from the lower part of the upper support portion and coupled to the first through-hole.

6. The aforementioned joint is formed with a circular cross-section. The abutment assembly according to claim 5, wherein the connecting portion is press-fitted into the first through-hole of the lower connecting portion, and its outer surface is in close contact with the inner surface of the first through-hole.

7. The abutment assembly according to claim 1, further comprising an abutment having a second internal groove formed in the center of which a second internal threaded portion is provided, a lower portion that supports the lower part of the lower connecting portion, and an upper portion that protrudes upward from the lower portion and connects to the first lower groove.

8. The abutment assembly according to claim 7, wherein the first lower groove includes an anti-rotation groove into which the upper portion is coupled.

9. The abutment assembly according to claim 8, wherein the first lower groove is formed in a shape corresponding to the outer surface of the upper portion.

10. The anti-rotation groove is formed as a polygonal groove with a polygonal shape, The abutment assembly according to claim 8, wherein a polygonal portion corresponding to the anti-rotation portion is formed on the upper part of the upper portion.

11. The abutment assembly according to claim 8, further comprising a screw supported on the upper surface of the upper connecting portion and having an outer circumferential threaded portion formed at its lower end for fastening to the second inner circumferential threaded portion of the abutment.

12. An implant that is placed in the alveolar bone and has a first internal groove on which a first inner circumferential threaded portion is formed, An abutment having a second internal groove formed in the center with a second internal threaded portion, a lower portion that is inserted into the first internal groove and fastened to the first internal threaded portion, and an upper portion that protrudes upward from the lower portion, A crown having a second through-hole extending vertically in the center, and a second lower groove provided below the second through-hole, A lower connecting portion is formed in which a first through hole extending vertically is formed in the center, a first lower groove is formed on the inside to connect to the upper part of the abutment in a manner that prevents relative rotation, and a rotation prevention portion is formed on the outside to connect to the second lower groove of the crown in a manner that prevents relative rotation. An abutment assembly comprising: an upper connecting portion having a third through-hole extending vertically in the center, which is inserted into the second through-hole of the crown and coupled to the lower connecting portion.

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