Dental implant structure

Abstract

The present invention relates to an abutment screw separated dental implant structure in which an abutment is fastened and fixed to a fixture implanted in the alveolar bone via an abutment screw. More specifically, the present invention relates to a dental implant structure in which the head of the abutment screw is not housed in the abutment but is formed to protrude above the post of the abutment, thereby making it possible to reduce the diameter (inner diameter) of the inner space of the abutment, and thereby making it possible to freely form the diameter and thickness of the abutment post to desired sizes.

Description

[Technical Field]

[0001] The present invention relates to a dental implant structure of a separate abutment screw type in which an abutment is fastened to a fixture implanted in alveolar bone via an abutment screw. More specifically, the present invention relates to a dental implant structure in which the head of the abutment screw is not housed in the abutment but protrudes above the post of the abutment, thereby reducing the diameter (inner diameter) of the inner space of the abutment and allowing the diameter and thickness of the abutment post to be freely formed to desired sizes. [Background technology]

[0002] A dental implant structure basically includes a fixture that is implanted into the alveolar bone, an abutment that is fixed to the fixture and supports lateral or horizontal pressure in response to the occlusal force applied during chewing, and a crown (artificial tooth) that is placed over the abutment to restore the aesthetic beauty of a natural tooth.

[0003] The abutment is fastened to the fixture via an abutment screw. Depending on the structure in which the abutment screw is connected to the abutment, abutments can be broadly classified into integrated abutment screw abutments and separate abutment screw abutments. In the integrated abutment screw abutment, the abutment screw is formed integrally with the abutment, while in the separate abutment screw abutment, the abutment screw is separate from the abutment.

[0004] FIG. 1 is a cross-sectional view schematically showing a conventional abutment-screw separated abutment.

[0005] As shown in Figure 1, a conventional separate abutment screw abutment 2 is fastened and fixed to a fixture 1 via an abutment screw 3. The abutment screw 3 includes a threaded portion 3a that is screwed into the fixture 1, and a head portion 3b that is formed with a diameter larger than the diameter of the threaded portion 3a and that engages downward with an inner jaw portion 2d formed on the inside of the abutment 2.

[0006] In such a conventional separate-abutment-screw abutment 2, the head portion 3b of the abutment screw 3 is configured to be housed inside the abutment 2, which becomes an obstacle to forming the diameter and thickness of the abutment 2 to the target diameter and thickness. In other words, because the head portion 3b of the abutment screw 3 is formed with a larger diameter than the threaded portion 3a, the diameter (inner diameter) of the inner space 2e of the abutment 2 in which the head portion 3b is housed also needs to be formed larger than the diameter of the head portion 3b, corresponding to the diameter of the head portion 3b. This makes it difficult to form the post 2c of the abutment 2 to the target diameter and thickness.

[0007] Typically, the diameter (outer diameter) of the threaded portion 3a of the abutment screw 3 is formed to be approximately 2.0 mm (standard thread diameter), and the head portion 3b is formed to be approximately 0.3 to 0.4 mm larger than the diameter of the threaded portion 3a, i.e., approximately 2.3 to 2.4 mm. As a result, the top diameter (d2) of the abutment 2 must be at least approximately 0.5 mm larger than the diameter (d1) of the head portion 3b of the abutment screw 3. Therefore, the top diameter (d2) of the post 2c of the abutment 2 must be at least 2.8 mm, as shown in Figure 1 (the sum of the diameter (d1) of the head portion 3b of the abutment screw 3, 2.4 mm, and the thickness (t1) of the metal material constituting the abutment 2, 0.4 mm (0.2 mm x 2)).

[0008] In a separate abutment screw type abutment structure in which the head portion 3b of the abutment screw 3 is housed inside, the diameter (d2) of the post 2c of the abutment 2 must be at least 2.8 mm. This makes it difficult to apply an abutment with this structure to the mandibular anterior teeth. The mandibular anterior teeth are areas where the tooth diameter is relatively small, and in order to make the mandibular teeth look natural, the diameter (d2) of the post 2c of the abutment 2 must often be 2.8 mm or less. However, for the reasons mentioned above, this problem is often not solved with conventional abutment structures. Furthermore, if the diameter of the post 2c is made smaller, the outer wall angle of the post approaches 90°, which can make the crown path difficult. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Korean Patent Publication No. 10-2017-0102280 (2017.09.08.) [Patent Document 2] Korean Registered Utility Model No. 20-0467684 (2013.06.21.) [Patent Document 3] Korean Patent Registration No. 10-1210671 (2012.12.04) Summary of the Invention [Problem to be solved by the invention]

[0010] As described above, an inner space 2e must be provided in the center of the abutment to accommodate the head portion 3b of the abutment screw 3. Therefore, the thickness (thickness from the outer surface to the inner surface) of the post 2c of the abutment 2 must be made thinner. Furthermore, in the case of an abutment 2 used in patients with narrow tooth widths, the cuff 2b is formed with a relatively small diameter, and the lower end of the post 2c that contacts the upper end surface of the cuff 2b must also be made small to accommodate the small diameter of the cuff 2b. Furthermore, in a structure in which an elastic ring is attached to the outer surface of the post to absorb occlusal forces, such as in Korean Patent Registration No. 10-2323728, the diameter of the post must be made even smaller to take into account the thickness of the elastic ring.

[0011] This makes it more difficult to form a coupling groove for coupling the elastic ring around the outer surface of the post 2c of the abutment. For example, when forming a coupling groove around the outer surface of the post 2c of the abutment, an unnecessary hole (a hole that connects the outside of the post with the internal space 2e) may be formed on the side of the host 2c, or the thickness may be reduced at the coupling groove location, making the structure weak and making it difficult to apply the elastic ring to the abutment.

[0012] Therefore, the present invention has been proposed to solve various conventional problems, and the problem (objective) to be solved is to provide a dental implant structure that can reduce the diameter of the inner space of the abutment in an abutment screw separated abutment structure and overcome structural limitations such as restrictions on the diameter and thickness of the abutment post.

[0013] Another problem to be solved by the present invention is to provide a dental implant structure that can buffer the occlusal force applied during repeated chewing between the crown and the abutment without affecting the diameter or thickness of the abutment post, while stably forming a connection groove into which an elastic ring for connection between the crown and the abutment is connected.

[0014] Furthermore, the present invention is not limited to the above-mentioned objects, and various other objects can be further provided by the techniques described in the following examples and claims. [Means for solving the problem]

[0015] In one embodiment to achieve the above object, the present invention provides a dental implant structure in which an abutment is fastened to a fixture implanted in alveolar bone via an abutment screw, the abutment screw including: a threaded portion coupled to the fixture through an inner space of the abutment; a connecting portion formed on an upper portion of the threaded portion and engaged downward with the abutment; a connecting portion formed on an upper portion of the connecting portion and engaged downward with the abutment; and a head portion formed on an upper portion of the connecting portion and protruding from an upper portion of the abutment.

[0016] The head portion may have a diameter that decreases from the bottom to the top.

[0017] Also, a driver hole may be formed in the head portion.

[0018] Also, a vertical cut surface may be formed on a side surface of the head portion.

[0019] In addition, a coupling groove into which an elastic ring is coupled may be formed on the periphery of the head portion.

[0020] Also, an elastic ring in the form of a C-ring or an O-ring may be coupled to the coupling groove.

[0021] The connecting portion may be accommodated in an inner space of the abutment.

[0022] In addition, a locking jaw portion may be formed at the boundary between the threaded portion and the connecting portion, which is locked downwardly to an inner jaw portion formed in the inner space of the abutment.

[0023] The connecting portion may have a tapered structure in which the diameter increases toward the top.

[0024] The dental implant may further include a crown provided to cover the head portion and the post of the abutment, and the crown may have a receiving groove formed therein to receive the head portion and the post of the abutment.

[0025] Also, an elastic body can be provided between the accommodation groove and a crown accommodation portion including the head portion and the post of the abutment accommodated inside the accommodation groove.

[0026] The dental implant may further include an abutment cap coupled to the head portion and received in the receiving groove.

[0027] The abutment cap may also include a threaded portion of the abutment cap that is screwed onto the head portion of the abutment screw, and a head portion of the abutment cap that is formed on top of the threaded portion of the abutment cap and presses the inner wall of the accommodating groove portion toward the abutment. [Effects of the Invention]

[0028] As described above, the dental implant structure according to the present invention provides a dental implant structure with a new structure in which the head of the abutment screw is not housed in the abutment but is formed to protrude from the upper part of the abutment post, thereby effectively reducing the diameter (inner diameter) of the inner space of the abutment, and thereby allowing the abutment post to be freely formed to a desired size without any restrictions on the diameter and thickness.

[0029] Furthermore, the dental implant structure according to the present invention provides a dental implant structure with a new structure in which a coupling groove is formed in the head of the abutment screw that protrudes above the abutment post and an elastic ring is coupled to the coupling groove, thereby making it possible to stably couple the crown and abutment without using adhesive, without affecting the diameter and thickness of the abutment post. Furthermore, the elastic ring allows for smooth and stable attachment and detachment of the crown, and absorbs repeatedly applied occlusal forces, preventing fracture of the abutment and / or fixture.

[0030] Furthermore, according to the dental implant structure of the present invention, an elastic body is formed between the accommodation groove formed in the crown and the crown accommodation portion (the portion including the head portion of the abutment screw and the abutment post) accommodated inside the accommodation groove of the crown, and by preventing the crown from contacting the crown accommodation portion, a surplus space is secured between the crown and the crown accommodation portion in which the elastic ring can smoothly contract and expand, and the elastic force of the elastic ring is used together with the elastic ring to absorb the occlusal forces repeatedly applied to the crown, preventing the crown, abutment and / or fixture, etc. from breaking due to the repeated occlusal forces and preventing foreign matter from getting between the crown and the abutment. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 10 is a cross-sectional view showing a conventional abutment screw separated abutment. [Figure 2] FIG. 1 is an assembled cross-sectional view showing a dental implant structure according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view of the dental implant structure shown in FIG. 2 in a state where an abutment screw is separated. [Figure 4] FIG. 2 is a cross-sectional view showing Example 1 of the present invention and Comparative Example 1 for comparison. [Figure 5]FIG. 10 is an assembled cross-sectional view showing a dental implant structure according to Example 2 of the present invention. [Figure 6] FIG. 6 is a cross-sectional view of the dental implant structure shown in FIG. 5 in a state where the abutment screw is separated. [Figure 7] FIG. 10 is an assembled cross-sectional view showing a dental implant structure according to Example 3 of the present invention. [Figure 8] FIG. 10 is a cross-sectional view showing Example 3 of the present invention and Comparative Example 2 for comparison. [Figure 9] FIG. 10 is an assembled cross-sectional view showing a dental implant structure according to Example 4 of the present invention. [Figure 10] FIG. 10 is a cross-sectional view showing a state in which the crown in FIG. 9 is joined. [Figure 11] FIG. 10 is a cross-sectional view showing a dental implant structure according to a fifth embodiment of the present invention. [Figure 12] FIG. 10 is a cross-sectional view showing a dental implant structure according to a sixth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] The advantages and features of the present invention, as well as methods for achieving them, will become clearer with reference to the following detailed examples in conjunction with the accompanying drawings. The same reference numerals refer to the same components throughout this specification. The size and shape of each component shown in each drawing may be exaggerated for the sake of convenience and are not intended to be limiting. Furthermore, when "A and / or B" is used, it can mean both A and B, or either A or B.

[0033] To achieve the above-mentioned problems (objectives), the present invention provides a dental implant structure with a new structure in which the head of the abutment screw is not housed inside the abutment but is formed to protrude above the abutment post. That is, in the dental implant structure according to the present invention, the head of the abutment screw is formed to protrude above the abutment post, which allows the diameter (inner diameter) of the inner space of the abutment to be reduced, thereby allowing the diameter and thickness of the abutment post to be freely formed to desired sizes.

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0035] Example 1 Fig. 2 is an assembled cross-sectional view schematically showing a dental implant structure according to Example 1 of the present invention, and Fig. 3 is a cross-sectional view showing a state in which the abutment screw is separated from the dental implant structure shown in Fig. 2. For convenience of explanation, the crown is omitted here.

[0036] Referring to Figures 2 and 3, the dental implant structure 10 according to Example 1 of the present invention includes an abutment screw 13 that is connected through the inner space (middle hole) 12e of the abutment 12 and has an upper portion that protrudes from the upper portion of the post 12c of the abutment 12.

[0037] As shown in Figure 3, the abutment screw 13 includes a threaded portion 13a that is screwed into the fixture 11 that is implanted in the alveolar bone, a connecting portion 13b that is formed on the upper part of the threaded portion 13a and is housed inside the inner space 12c of the abutment 12, and a head portion 13c that is formed on the upper part of the connecting portion 13b so as to protrude from the upper part of the post 12c of the abutment 12, as shown in Figure 2.

[0038] A locking jaw 13d is formed at the boundary between the threaded portion 13a and the connecting portion 13b, and is engaged downwardly with the inner jaw 12d of the abutment 12. The connecting portion 13b may have a tapered structure in which the outer surface of the lower portion connected to the threaded portion 13a has a vertical surface, and the outer surface of the upper portion connected to the head portion 13c has an inclined surface so that the diameter increases.

[0039] On the other hand, if the function of the locking portion is performed by the tapered portion a1 without forming the inner jaw portion 12d of the abutment 12, it is possible to omit the locking jaw portion 13d of the abutment screw 13. In this case, the tapered surface (s1) of the abutment screw 13, which is inserted into the inside of the post 12c of the abutment 12, comes into contact with the tapered portion a1 of the abutment 12, and the two are locked together.

[0040] 2, the head portion 13c is formed to protrude from the upper portion of the post 12c of the abutment 12 and is accommodated inside a crown (not shown) together with the post 12c of the abutment 12. The head portion 13c has a tapered structure with an inclined outer surface so that the diameter decreases from the bottom to the top, allowing it to be stably accommodated in the crown. In addition, a driver hole 13e into which a driver tool can be inserted may be formed at the upper end of the head portion 13c.

[0041] 3, the abutment 12 includes a connecting portion 12a that is connected to the fixture 11, a cuff 12b that is formed on the connecting portion 12a and has a tapered structure with an inclined outer surface so that the diameter increases, and a post 12c that is formed on the upper portion of the cuff 12b and has a tapered structure with an inclined outer surface so that the diameter decreases and is received in the crown. An outer jaw 12f with a step is formed at the boundary between the cuff 12b and the post 12c.

[0042] 4 is a cross-sectional view schematically showing Example 1 of the present invention for comparison with Comparative Example 1. Here, Comparative Example 1 has the same structure as the example of the prior art shown in FIG.

[0043] Referring to FIG. 4, in Example 1 of the present invention, the height (h1) of the post 12c of the abutment 12 is formed to be lower than the height (h2) of the post 2c of the abutment 2 according to Comparative Example 1.

[0044] In Example 1 of the present invention, the head portion 13c of the abutment screw 13 is formed to protrude above the post 12c of the abutment 12, and partially replaces the role (bonding to the crown) played by the post 2c of the abutment 2 in conventional implant structures such as Comparative Example 1. This allows for flexible formation of the post inner space 2e of the abutment 2 regardless of the diameter and thickness (t1) of the abutment 2, which have been problematic in conventional implant structures.

[0045] Furthermore, in an implant structure such as that of Comparative Example 1, an inner space 2e that accommodates the head portion 3b of the abutment screw 3 is inevitably formed inside the abutment 2, which necessitates a reduction in the thickness (t1) of the post 2c of the abutment 2 by the diameter of the inner space 2e, thereby increasing the risk of fracture due to weakened strength. However, in Example 1 of the present invention, the abutment screw 13 is formed with a structure without a center hole, and the upper end diameter d11 is thicker than the thickness (t1) of the post 2c of Comparative Example 1, thereby improving strength.

[0046] Example 2 Fig. 5 is an assembled cross-sectional view schematically showing a dental implant structure according to Example 2 of the present invention, and Fig. 6 is a cross-sectional view showing a state in which the abutment screw is separated from the dental implant structure shown in Fig. 5. For convenience of explanation, the crown is omitted here.

[0047] 5 and 6, a dental implant structure 20 according to Example 2 of the present invention includes a fixture 21, an abutment 22, and an abutment screw 23, similar to Example 1. However, in Example 2, the diameter d12 of the head portion 23c of the abutment screw 23 housed inside the crown is formed smaller than that of Example 1.

[0048] In Example 2, instead of forming a driver hole in the head portion 23c of the abutment screw 23, a vertical cut surface 23d (see circle) is formed on the outer surface of the head portion 23c in order to use a tool such as a ratchet to tighten and loosen the abutment screw 23. Therefore, in Example 2, by forming the vertical cut surface 23d on the outer surface instead of a driver hole in the head portion 23c of the abutment screw 23, it is possible to form the diameter d12 of the head portion 23c of the abutment screw 23 smaller than the diameter d11 of the head portion 13c of the abutment screw 13 in Example 1.

[0049] Example 3 Fig. 7 is an assembled cross-sectional view schematically showing a dental implant structure according to Example 3 of the present invention, and Fig. 8 is a cross-sectional view schematically showing Example 3 of the present invention for comparison with Comparative Example 2. Here, for convenience of explanation, the crown is omitted.

[0050] 7, a dental implant structure 30 according to Example 3 of the present invention includes a fixture 31, an abutment 32, and an abutment screw 33, similar to Example 1. However, in Example 3, a band-shaped coupling groove 33d is formed around the head portion 33c of the abutment screw 33 to which an elastic member having a ring structure, i.e., an elastic ring 34 (see circle), is coupled. At this time, one or more coupling grooves 33d may be formed.

[0051] The elastic ring 34 can have a C-ring or O-ring structure. When an O-ring structure is used, it can be made of silicone rubber, synthetic rubber, or a ring woven with thin nitinol wire. When a C-ring structure is used, a metal film such as nitinol or plastic can be used. This elastic ring 34 buffers the impact caused by the occlusal force applied to the crown during chewing between the crown and the abutment post 32c and the head 33c of the abutment screw 33. It also allows the crown to be bonded to the abutment 32 and abutment screw 33 without the use of adhesive, preventing unintended crown detachment.

[0052] Furthermore, in an implant structure such as Comparative Example 2, an internal space 4e is formed inside the abutment 4 to accommodate the head portion 3b of the abutment screw 3, so the thickness of the post 4c of the abutment 4 is reduced by the diameter of the internal space 4e, and if a coupling groove 4d is additionally formed therein, the thickness t3 of the post 4c of the abutment 4 will be further reduced at the location where the coupling groove 4d is formed, which could result in a hole being formed during the process of forming the coupling groove 4d and communicating with the internal space 4e. However, in Example 3, no center hole is formed in the head portion 33c of the abutment screw 33, so a sufficient thickness (t2) is ensured and the problem with the implant structure such as in Comparative Example 2 does not occur.

[0053] 8, in Comparative Example 2, an inner space 4e is formed in the abutment 4, but in Example 3, no empty space is formed in the head portion 33c of the abutment screw 33 that is formed to protrude outward from the post 32c of the abutment 32. For this reason, even if a coupling groove 33d is formed around the periphery of the head portion 33c of the abutment screw 33, no structural problems arise due to the thickness of the head portion 33c of the abutment screw 33.

[0054] When fabricating the crown, a peripheral groove (not shown) into which a portion of the elastic ring 34 is inserted may be formed around the inner periphery of the crown corresponding to the elastic ring 34. When the crown is seated on the post 32c of the abutment 32, the elastic ring 34 is horizontally coupled to the peripheral groove formed on the inner side of the crown and the coupling groove 33d formed in the head portion 33c of the abutment screw 33. This allows the crown to be fixed to the abutment 32 without using adhesive.

[0055] Meanwhile, when the crown is seated, the post 32c of the abutment 32 and the head 33c of the abutment screw 33 are received in the inner receiving groove of the crown. Hereinafter, for convenience of explanation, the post 32c of the abutment 32 and the head 33c of the abutment screw 33 received in the receiving groove formed inside the crown will be referred to as the "crown receiving portion." A crown that moves in response to occlusal force can also be fabricated by inserting an elastic body (not shown) between the crown receiving portion and the crown receiving groove. In this case, the elastic body can be coated or bonded to the outer surface of the crown receiving portion. Alternatively, it can be coated or bonded to the inner wall of the crown receiving groove. Alternatively, the elastic body can be formed as a thin, independent product and inserted between the crown receiving portion and the crown receiving groove.

[0056] Example 4 FIG. 9 is an assembled cross-sectional view schematically showing a dental implant structure according to a fourth embodiment of the present invention, and FIG. 10 is a cross-sectional view schematically showing a state in which the crown in FIG. 9 has been joined.

[0057] 9 and 10, a dental implant structure 40 according to Example 4 of the present invention includes a fixture 41, an abutment 42, and an abutment screw 43, similar to Example 1. The abutment cap 44 is screwed onto the top of the abutment screw 43 to more stably fix a crown 45 to the post 42c of the abutment 42 and the head 43c of the abutment screw 43.

[0058] The abutment cap 44 includes a threaded portion 44a that is coupled to the head portion 43c of the abutment screw 43. The threaded portion 44a is threadedly engaged with the thread groove portion 43d of the head portion 43c of the abutment screw 43 via threads 141a formed on the outer circumferential surface. The abutment cap 44 also includes a head portion 44b formed on the upper portion of the threaded portion 44a. A driver hole 44c may be formed at the upper center of the head portion 44b to be coupled with a driver tool when assembling or disassembling the abutment cap 44 to or from the head portion 43c of the abutment screw 43. The driver hole 44c may be hexagonal, star-shaped, or cross-shaped, for example. Meanwhile, the head portion 44b of the abutment cap 44 may have a tapered structure with an inclined surface whose diameter increases toward the upper side, so that the outer surface corresponds to the inner surface of the crown 45 to tightly secure the crown 45, as shown in FIG. 10. Or it can consist of a "T" shaped structure.

[0059] Example 5 FIG. 11 is a cross-sectional view schematically showing a dental implant structure according to a fifth embodiment of the present invention, illustrating a state in which the abutment screw has been separated from the abutment.

[0060] 11 , a dental implant structure 50 according to Example 5 of the present invention includes a fixture 51, an abutment 52, and an abutment screw 53, similar to Example 1. However, unlike Example 1, the threads 53b are not formed on the entire upper and lower parts of the threaded portion 53a of the abutment screw 53, but are formed only on the lower part that is substantially screwed into the threads 51a formed on the fixture 51.

[0061] Example 6 FIG. 12 is a cross-sectional view schematically showing a dental implant structure according to a sixth embodiment of the present invention, illustrating a state in which the abutment screw has been separated from the abutment.

[0062] 12, a dental implant structure 60 according to Example 6 of the present invention includes a fixture 61, an abutment 62, and an abutment screw 63, similar to Example 5. However, unlike Example 5, an outer surface 63d of a connecting portion 63b of the abutment screw 63 has a tapered structure with an inclined surface whose diameter increases toward a head portion 63c. In addition, an inner surface 62a of an abutment 62, which comes into contact with the outer surface 63d of the connecting portion 63b, also has a tapered structure with an inclined surface similar to the inclined surface of the connecting portion 63b.

[0063] Meanwhile, the abutment screws 13, 23, 33, 43, 53, and 63 proposed in Examples 1 to 6 of the present invention have heads 13c, 23c, 33c, 43c, 53c, and 63c with a structure in which the diameter decreases from bottom to top. That is, the heads 13c, 23c, 33c, 43c, 53c, and 63c have a tapered structure in which the diameter decreases from the abutment side to the top. Furthermore, the heads 13c, 23c, 33c, 43c, 53c, and 63c may have a cylindrical structure. This structure allows the heads 13c, 23c, 33c, 43c, 53c, and 63c to be easily inserted into the crown.

[0064] As mentioned above, the preferred embodiments of the present invention have been described and illustrated using specific terms, but such terms are merely for the purpose of clarifying the present invention. It is obvious that various modifications and changes can be made to the embodiments of the present invention and the terms used herein without departing from the technical spirit and scope of the following claims. Such modified embodiments should not be understood separately from the spirit and scope of the present invention, but should be considered to fall within the scope of the claims of the present invention.

Claims

1. In an abutment screw separated dental implant structure, an abutment is fastened and fixed to a fixture implanted in alveolar bone via an abutment screw, The abutment screw a threaded portion coupled to the fixture through a space inside the abutment; A connecting portion formed on an upper portion of the threaded portion and engaged with the abutment in a downward direction; and a head portion formed on an upper portion of the connecting portion and protruding from an upper portion of the abutment, a crown provided to cover the head portion and the post of the abutment; The crown has an accommodating groove formed therein for accommodating the head portion and the post of the abutment, The abutment further includes an abutment cap coupled to the head portion and received in the receiving groove. Dental implant structures.

2. The dental implant structure according to claim 1 , wherein the head portion has a diameter that decreases from the bottom to the top.

3. The dental implant structure according to claim 1 , wherein the head portion is formed with a driver hole.

4. The dental implant structure according to claim 1 , wherein a vertical cut surface is formed on a side surface of the head portion.

5. The dental implant structure according to claim 1 , wherein a coupling groove for coupling an elastic ring thereto is formed around the periphery of the head portion.

6. The dental implant structure according to claim 5, wherein an elastic ring in the form of a C-ring or an O-ring is coupled to the coupling groove.

7. The dental implant structure according to claim 1 , wherein the connecting portion is accommodated in an inner space of the abutment.

8. 2. The dental implant structure according to claim 1, wherein a locking jaw portion is formed at the boundary between the screw portion and the connecting portion, the locking jaw portion being engaged downwardly with an inner jaw portion formed in the inner space of the abutment.

9. The dental implant structure according to claim 1 , wherein the connecting portion has a tapered structure in which the diameter increases toward the top.

10. 2. The dental implant structure according to claim 1, wherein an elastic body is provided between the accommodating groove portion, the head portion accommodated inside the accommodating groove portion, and a crown accommodating portion including a post of the abutment.

11. The abutment cap is a threaded portion of the abutment cap that is screwed onto the head portion of the abutment screw; and a head portion of the abutment cap formed on an upper portion of the threaded portion of the abutment cap and pressing an inner wall of the accommodation groove toward the abutment; The dental implant structure of claim 1 , comprising:

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