ABUTMENT AND CROWN COUPLING STRUCTURE FOR IMPLANT

Abstract

The present invention relates to a coupling structure between an abutment and a crown for an implant. To this end, the present invention relates to a coupling structure between an abutment and a crown for an implant, the structure having a lower part of an abutment facing and coupled to, by a bolt, the upper part of a fixture coupled to a tooth-extraction hole of the alveolar bone, and having a lower part of a crown inserted into and coupled to the upper part of the abutment, wherein the abutment has: a support stepped part formed along the edge at the lower part of an abutment body having a stepped hole; a crown supporting guide formed along the edge of the abutment body from the inner upper part of the support stepped part; and an inclined groove part formed at the upper part of the abutment body, and the crown has: an abutment insertion groove, of which the lower side is open, formed at a crown body; a hanging stepped part formed at the edge of an inlet side of the abutment insertion groove; a shock-absorbing layer provided on the inner surface of the abutment insertion groove; and an inclined protrusion part integrally formed at the bottom surface of the inner upper part of the abutment insertion groove. Therefore, the present invention can prevent shock from being transmitted to the abutment through the crown, thereby minimizing a feeling of unfamiliarity, and can reuse the implant since only the resin inserted into a contact part of the crown is separated and new resin is filled therein.

Claims

1. A coupling structure between an abutment and a crown for an implant in which a lower part of an abutment abuts and is coupled to an upper part of a fixture that is coupled to a tooth-extraction hole of an alveolar bone by a bolt, and a lower part of a crown is fitted and coupled to an upper part of the abutment, wherein: the abutment has a support step formed along an edge of a lower part of an abutment body in which a step hole is formed, a crown support guide formed along an edge of the abutment body from an inner upper part of the support step, and an inclined groove part formed at an upper part of the abutment body, and the crown has an abutment insertion groove with an open lower part formed in a crown body, a locking step formed at an inlet-side edge of the abutment insertion groove, an impact-absorbing layer disposed at an inner surface of the abutment insertion groove, and an inclined protrusion integrally formed with a lower surface of an inner upper part of the abutment insertion groove.

2. The coupling structure between an abutment and a crown for an implant of claim 1, wherein the support step has a fitting part disposed at an edge of a horizontal part, and the fitting part is formed so that a lower angle of inclination () toward an inside of the abutment body with respect to a vertical direction is in a range of 0 to 6, and a lower part height is in a range of 1 to 2 mm.

3. The coupling structure between an abutment and a crown for an implant of claim 1, wherein the crown support guide has a width that gradually narrows in an upward direction from a lower part at which the support step is formed, and the width is formed so that an upper angle of inclination toward the inside of the abutment body with respect to a vertical direction is in a range of 0 to 6, and an upper part height is in a range of 2 to 4 mm.

4. The coupling structure between an abutment and a crown for an implant of claim 1, wherein the crown is formed of zirconia, the impact-absorbing layer has a fine concave-convex layer (231) formed by etching at an inner surface of the abutment insertion groove, a primer layer is formed by a primer being applied to the fine concave-convex layer, and a resin layer is applied to the primer layer.

5. The coupling structure between an abutment and a crown for an implant of claim 1, wherein the impact-absorbing layer has the same width as the width of the crown support guide.

6. The coupling structure between an abutment and a crown for an implant of claim 1, wherein the crown has a contact part formed at a part at which the crown abuts another neighboring crown, the contact part has a contact insertion groove that is formed in the crown by etching, and a contact resin is inserted into the contact insertion groove.

7. The coupling structure between an abutment and a crown for an implant of claim 4, wherein the impact-absorbing layer has the same width as the width of the crown support guide.

8. The coupling structure between an abutment and a crown for an implant of claim 4, wherein the crown has a contact part formed at a part at which the crown abuts another neighboring crown, the contact part has a contact insertion groove that is formed in the crown by etching, and a contact resin is inserted into the contact insertion groove.

Description

DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a perspective view illustrating a state in which an abutment and a crown for an implant are coupled to a tooth-extraction hole of an alveolar bone according to the present invention.

[0025] FIG. 2 is a longitudinal cross-sectional view illustrating a coupling structure between an abutment and a crown for an implant according to the present invention.

[0026] FIG. 3 is an exploded longitudinal cross-sectional view illustrating the coupling structure between the abutment and the crown for an implant according to the present invention.

[0027] FIG. 4 is a longitudinal cross-sectional view illustrating the state in which the abutment and the crown for an implant are coupled to the tooth extraction hole of the alveolar bone according to the present invention.

MODES OF THE INVENTION

[0028] Embodiments of the present invention will be described below with reference to the accompanying drawing.

[0029] FIG. 1 is a perspective view illustrating a state in which an abutment and a crown for an implant are coupled to a tooth-extraction hole of an alveolar bone according to the present invention, FIG. 2 is a longitudinal cross-sectional view illustrating a coupling structure between an abutment and a crown for an implant according to the present invention, FIG. 3 is an exploded longitudinal cross-sectional view illustrating the coupling structure between the abutment and the crown for an implant according to the present invention, and FIG. 4 is a longitudinal cross-sectional view illustrating the state in which the abutment and the crown for an implant are coupled to the tooth extraction hole of the alveolar bone according to the present invention.

[0030] As illustrated in FIGS. 1 to 4, with respect to the abutment and the crown for an implant according to the present invention, a fixture 30 is screw-coupled to a tooth-extraction hole 71 of an alveolar bone 70, and a lower part of an abutment 10 abuts and is coupled to an upper part of the screw-coupled fixture 30 by a bolt B so that a lower part of a crown 20 is simply fitted and coupled to an upper part of the abutment 10.

[0031] Here, the abutment 10 includes a step hole 101 that extends in a vertical direction formed to pass through the center of an abutment body 11 so that the abutment 10 can be coupled to the upper part of the fixture 30 by the bolt B.

[0032] A support step 12 is formed along an edge of a lower part of the abutment body 11 so that a lower end of a crown body 21 can be stably supported thereby.

[0033] The support step 12 has a fitting part 122 disposed at an edge of a horizontal part 121 so that a load acting thereon from above and a load acting thereon from an upper lateral side can be stably supported.

[0034] For this, it is preferable for the fitting part 122 to have 0 to 6 as a lower angle of inclination toward an inside of the abutment body 11 with respect to a vertical direction and 1 to 2 mm as a lower part height H.

[0035] It is more preferable for the fitting part 122 to have a vertical slope when the lower angle of inclination is 0, and for the fitting part 122 to have a tapered form when the lower angle of inclination is 6 so that the lower angle of inclination of the fitting part 122 can vary according to a size of the crown 20. Here, when the lower angle of inclination is larger than 0, the crown 20 can be easily coupled to the fitting part 122 due to a tapered form thereof, and the center of the abutment 10 and the center of the crown 20 can be automatically aligned.

[0036] The abutment body 11 includes a crown support guide 13 formed along an edge from an inner upper part at which the support step 12 is formed so that an abutment insertion groove 211 formed at an inner lower part of the crown body 21 is stably inserted therein and adherence to an impact-absorbing layer 23 is maintained.

[0037] The crown support guide 13 has a function that enables an inside of the crown body 21 to be stably supported and has a width W that narrows in an upward direction from the lower part at which the support step 12 is formed to facilitate coupling.

[0038] Here, the width W is formed so that an upper angle of inclination toward the inside of the abutment body 11 with respect to the vertical direction is in a range of 0 to 6, and an upper part height H is in a range of 2 to 4 mm.

[0039] An inclined groove part 14 having an inclined angle that decreases toward the center of the step hole 101 is formed at an upper part of the abutment body 11, and a predetermined space is maintained between the inclined groove part 14 and an inclined protrusion 24 formed at an upper part of the abutment insertion hole 211 of the crown body 21 so that a vacuum space can be maintained.

[0040] The crown 20 has the crown body 21 formed using zirconia to have the abutment insertion groove 211 with an open lower part and a locking step 22 formed at an inlet-side edge of the abutment insertion groove 211 to be stably supported by the support step 12.

[0041] The impact-absorbing layer 23 is disposed at an inner surface of the abutment insertion groove 211 to prevent an impact generated in a process of chewing food from being transmitted through the abutment 10 and the fixture 30.

[0042] The impact-absorbing layer 23 is etched in the inner surface of the abutment insertion groove 211 using an etching solution so that a fine concave-convex layer 231 is formed on a surface thereof and an adhesive strength of a primer layer 232 can be improved.

[0043] The primer layer 232 on which a primer having a predetermined thickness is applied is formed on the fine concave-convex layer 231, and hardening can be performed in the state in which a resin layer 233 having a predetermined thickness is applied to the primer layer 232. Here, the impact-absorbing layer 23 is formed to have the same width W as a width W of the crown support guide 13 to be prevented from moving while being fitted and coupled.

[0044] The inclined protrusion 24 having the same shape as the inclined groove part 14 formed at the upper part of the abutment body 11 may be integrally formed with a lower surface of an inner upper part of the abutment insertion groove 211.

[0045] The crown 20 includes a contact part 25 formed at a part at which the crown 20 abuts another crown so that the crown 20 is prevented from being locally deformed.

[0046] The contact part 25 includes a contact insertion groove 251 disposed in the crown 20, and hardening can be performed in the state in which a contact resin 252 is inserted into the contact insertion groove 251 when an inner surface of the contact insertion groove 251 is corroded by etching and fine protrusions are formed thereon. Here, it is preferable for an adhesive strength of the contact resin 252 to be further reinforced by a primer being applied to the corroded surface corroded by etching.

[0047] With respect to the above abutment and crown for an implant, first, screw threads formed at an outside of the fixture 30 are coupled to the tooth-extraction hole 71 formed in the alveolar bone 70, and then the lower part of the abutment body 11 is placed on the upper part of the fixture 30.

[0048] Then, the abutment body 10 is screw-coupled to the fixture 30 by the bolt B passing through the step hole 101.

[0049] Next, an implant is placed thereon by the abutment insertion groove 211 formed in the crown body 21 being inserted from the upper part to the lower part of the abutment body 11. Here, by the impact-absorbing layer 23 formed at an inner wall surface of the abutment insertion hole 211 of the crown body 21 abutting the crown support guide 13, movement can be prevented, and an impact generated in a process of chewing food can be prevented from being transmitted to the abutment body 11.

[0050] When a deformation occurs in the contact part 25 which is the part at which the crown 20 abuts another neighboring crown in a process in which the implant is used, the crown 20 is separated from the abutment body 11, the contact resin 252 filled in the deformed contact part 25 is removed, a new contact resin is press-fitted into the contact part 25 and hardened, and the crown 20 is fitted again to the abutment body 11 so that the crown 20 is reusable.