KR101943437B1 - Abutment assembly and Method for assembling the same - Google Patents

Abstract

Provided is an abutment assembly comprising: a prosthesis forming a lead-in hole therein; an abutment including an upper end post part which is inserted into and coupled with the prosthesis, a lower end implant part which is inserted into a fixture fixated at the alveolar bone, a middle end extended blade part which is extended toward a side between the implant part and the post part to support the prosthesis, and a cuff part which is connected between the extended blade part and the implant part to make an outer circumferential part come into contact with gum; and a screw inserted into and coupled with the abutment through the prosthesis. The post part of the abutment includes a plurality of cut recesses formed vertically from an upper end. The screw forms a tapered part on an outer circumferential surface of a middle part to extend the post part when inserted into the post part so that the post part is compressed on an inner circumferential surface of the lead-in hole of the prosthesis. The present invention couples the prosthesis with the abutment without cement bonding to make it unnecessary removing cement residues, thereby reducing surgical procedure time.

Description

Abutment assembly and method for assembling the same [0002]

The present invention relates to an abutment assembly and a method of assembling the same.

Implant refers to a replacement that restores when the original body tissue is lost, but implants are implanted with artificial teeth. It is a procedure to restore the function of the tooth by replacing the missing tooth root with a tooth root made of titanium which has no rejection reaction to the human body.

In general prostheses or dentures, the surrounding teeth and bones are damaged over time, but the implants do not injure the surrounding dental tissue, and they have the same function and shape as the natural teeth, but do not have cavities. Therefore, they can be used semi-permanently.

In addition, implants improve the function of dentures in patients with single missing teeth restoration, as well as in partial and total toothless patients, and improve the esthetic aspects of dental prosthesis restoration. Furthermore, it helps to stabilize the dentition as well as to disperse the excessive stress applied to the surrounding supporting bone tissue.

The dental implants are divided into a gingival bone, namely, a surgical procedure for implanting an implant on an alveolar bone, and a prosthetic procedure for attaching an artificial tooth by connecting an abutment to an implanted implant.

There are a variety of surgical procedures for such implants. A brief description of an example is given below.

First, a groove corresponding to a fixture dimension is formed through drilling and tapping, and a mount is fastened to the top of the fixture. Then, using a surgical handpiece, the fixture and the mount are inserted into the alveolar bone, and then the mount is removed from the fixture, so that the fixture is inserted into the alveolar bone. The first operation is completed by fastening the cover screw to the upper part of the fixture to seal the fixture.

The cover screw prevents bacteria and foreign substances present in the mouth from intruding into the fixture while waiting for the fixture's osseointegration. The duration of ossification is somewhat different depending on the patient's bone quality and implantation position, but usually takes 3 to 6 months.

Next, the gums are opened through the second operation to expose the cover screws, check the degree of fusion of the fixtures, and remove the cover screws. And a healing abutment is fastened to the top of the fixture for aesthetic gingival formation and waited for two to three weeks. In order to improve the complexity of such a second procedure, a first-aid procedure for fastening a healing abutment is often used, omitting the process of fastening and removing the cover screw.

Next, after confirming the esthetic gingival formation, the healing abutment is removed, and the impression coping is fastened on the fixture for the preparation of the prosthesis. The impression material is then used to create a preliminary impression in the mouth and remove the impression coping.

Then, a tooth model is prepared, an artificial tooth is pierced, an abutment is fastened to the upper part of the fixture, and the prosthesis, that is, the artificial tooth is fixed to the abdomen to complete the artificial tooth.

However, there are cement bonding method and screw fastening method as a method of combining an artificial tooth prosthesis to abutment.

In the case of the cement bonding method, there is a problem that the abutment and the prosthesis can not be separated when post-correction is required.

Japanese Patent Application Laid-Open No. 10-1768410 discloses an example of an abutment (locking link) that is engaged with a prosthesis by a screw fastening method.

The disclosed prior art locking link is configured to be secured by interference fit when inserting a fitting into the prosthesis. To this end, the coupling portion of the locking link interposed in the prosthesis is formed so as to extend from the lower end to the upper end, and a plurality of vertical incision grooves are formed and transverse grooves are formed on the outer circumferential surface.

However, in the conventional locking link, there is a problem that it is difficult to insert the coupling portion by inserting the extended top when inserting the coupling portion into the prosthesis. In addition, there is a possibility that the groove portion of the engaging portion is plastically deformed or broken in the process of making the engaging portion constricted to the prosthesis. In addition, since the coupling portion is coupled to the prosthesis in a state elastically deformed by the interference fit, stress is applied to the coupling portion continuously, so that the possibility that the coupling portion deforms or breaks with time increases.

Korean Patent Registration No. 10-1768410

It is an object of the present invention to provide an abutment assembly and a method of assembling the same that can detachably and firmly couple a prosthesis and an abutment to a fixture without cement bonding.

According to an aspect of the present invention, there is provided an abutment assembly comprising: a prosthesis having an inlet hole formed therein; An upper end post inserted into and joined to the prosthesis; a lower end insertion portion inserted into a fixture fixed to the alveolar bone; and an extension of an abutment extending laterally between the insertion and post portions to support the prosthesis An abutment including a blade portion and a cuff portion connected between the extended blade portion and the abutment portion and having an outer circumferential surface contacting the gum; And a screw inserted and coupled to the abutment through the prosthesis, wherein the post portion of the abutment includes a plurality of incision grooves formed vertically from the top, wherein the screw has a tapered portion formed on an outer peripheral surface of the intermediate portion The post portion is expanded when inserted into the post portion so that the post portion is pressed on the inner circumferential surface of the insertion hole of the prosthesis.

And a circular slot having a diameter larger than the width of the incision groove is formed at the lower end of the incision groove.

The outer circumferential surface of the head of the screw may be formed as a curved surface whose outer diameter decreases gradually as it goes downward, and is preferably supported on an inclined curved surface formed in the middle portion of the prosthesis.

Preferably, the post portion of the abutment includes a plurality of protrusions formed on the outer circumferential surface, and the prosthesis includes a plurality of support recesses into which the plurality of protrusions are inserted.

It is preferable that the thickness of the post portion of the abutment gradually decreases toward the upper side.

It is preferable that the outer circumferential surface of the cuff portion is formed in an S-shaped curved surface shape so as to be advantageous in forming an emergence profile.

A method of assembling an abutment assembly of the present invention includes a prosthesis having an insertion hole formed therein, an abutment inserted into and coupled to a fixture fixedly attached to an alveolar bone inserted and inserted into the prosthesis, A method of assembling an abutment assembly, the method comprising the steps of: inserting an upper post portion of the abutment into an insertion hole of the prosthesis from below to form a projection on an outer surface of the post portion, A first step of inserting and fixing a support groove formed in an inner surface of the support member; A second step of inserting the screw into the insertion hole of the prosthesis so that the lower end thread of the screw is fastened to the inner circumferential thread of the abutment; A third step of inserting the lower end portion of the abutment into the abutment engagement portion of the fixture to engage with the abutment engagement portion; And a fourth step of rotating the screw to fasten the lower end thread portion to the inner circumferential surface thread portion of the fixture.

The post portion is formed with a plurality of incision grooves in the longitudinal direction at the upper end thereof. In the fourth step, the taper portion formed on the outer peripheral surface of the middle portion of the screw expands the post portion so that the post portion is pressed onto the inner circumferential surface of the insertion hole of the prosthesis desirable.

According to the abutment assembly and the assembly method of the present invention, since the prosthesis is bonded to the abutment without cement bonding, there is no need to remove the cement residue, shortening the procedure time, , It is possible to prevent side effects such as infection, failure in operation, retraction of the gingiva, and the like, thereby increasing the lifetime of the implant.

Also, because the prosthesis and abutment are mechanically coupled, it is very easy to attach and detach, easy to manage, and because the procedure time is shortened, the dentist's consultation time is shortened accordingly.

In addition, since the post portion height of the abutment can be variously adjusted to the height of various prostheses in preparation for the conventional implant, the post portion can be arranged to a proper height in the prosthesis, so that it can sufficiently cope with lateral pressure applied to the prosthesis .

Further, since the cuff portion of the abutment can be formed to fit the patient's gums, it can be widely applied to patients having a low gum thickness.

Further, the abutment's extended nose portion and the cuff portion can be embedded in the gum more deeply than before, so that the possibility that the abutment is exposed to the outside even when the gingival recession is reduced is much lower than in the past.

1 is a perspective view illustrating an abutment according to an embodiment of the present invention.
2 is an exploded perspective view of an abutment assembly in accordance with an embodiment of the present invention.
Figure 3 is an exploded view of the abutment assembly, excluding the fixture, in Figure 2;
FIGS. 4 and 5 are views showing a process of coupling an abutment and a screw to a prosthesis and coupling the same to a fixture.
6 is a view showing a state in which the abutment assembly is coupled to the fixture.

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

2 is an exploded perspective view of an abutment assembly according to an embodiment of the present invention, and Fig. 3 is an exploded perspective view of an abutment assembly according to an embodiment of the present invention, And shows a process of coupling an abutment and a screw to a prosthesis and coupling the same to a fixture.

The abutment assembly of the present invention includes a prosthesis 100 having an insertion hole 110 formed therein, an abutment 300 inserted into a fixture 400 inserted into the prosthesis and fixed to the alveolar bone, And a screw 200 inserted into the abutment through the prosthesis.

The prosthesis 100 is an external shape of an artificial tooth, and is processed in a dental laboratory through a computer aided design (CAD) or a computer aided manufacturing (CAM) system. The prosthesis 100 is preferably made of zirconia. At the central portion of the prosthesis 100, an abutment 300 is inserted from the lower side, and an inlet hole 110 through which the screw 200 is inserted from above is vertically formed.

1 and 3, the insertion hole 110 of the prosthesis 100 may include an upper end hole 120, a middle step 140, and a lower end hole 160. [

The abutment 300 includes an upper post 320 inserted into the prosthesis 100 and a lower portion 380 inserted into the fixture 400 fixed to the alveolar bone, An abutment extension portion 340 extending laterally between the post portions to support the prosthesis and a cuff portion 360 connected between the extension portion and the abutment portion and having an outer circumferential surface contacting the gum .

It is preferable that the abutment 300 is made of a titanium material which has no rejection reaction to the human body and has excellent strength.

The post portion 320 is inserted into the lower end hole 160 of the prosthesis 100 from the bottom to the top. In the post portion 320, a plurality of cutting grooves 322 are formed vertically from the top. In the drawing, the cutout grooves 322 are spaced 90 degrees apart from each other in the post 320, but the number of the cutout grooves 322 is not limited to three, and may be three to six.

The mounting portion 380 may be a lower end portion inserted into the fixture 400 and coupled to the fixture 400, and the outer circumferential surface thereof may be formed in a hexagonal bolt shape. And can be fixed to the inner circumferential surface of the fixture 400 without being relatively rotated by being inserted into the inner side surface of the hexagon formed corresponding to the recessed portion. The outer surface of the mounting portion 380 is not limited to a hexagonal bolt, but may be formed as a square bolt or an octagonal bolt.

The extended blade 340 extends laterally from the lower end of the post 320 to form a circular disk so that the lower surface of the prosthesis 100 can be supported on the upper surface thereof. When the prosthesis 100 is pressed by the chewing motion, the extended blade 340 can firmly support the prosthesis 100. [

The cuff portion 360 forms a contour that extends downward from the outer periphery of the extended blade portion 340, and is a portion where the human gum touches. Since the human gums have various shapes and sizes, the cuff 360 can be formed in various shapes.

Still, it is preferable that the outer peripheral surface of the cuff portion 360 is basically formed in the shape of an S-shaped curved surface so as to be advantageous in forming an emergence profile.

In the prosthodontic procedure for implanting an artificial tooth above the implant, it is necessary to reproduce the state of the oral cavity without error outside the mouth to make an artificial tooth precisely in the laboratory. Reproducing the oral condition outside the mouth is called impression preparation.

When the outer circumferential surface of the cuff portion is formed so as to be bent linearly as in the cuff portion according to the prior art, an error may occur when the impression material is compressed and not the same as the inner shape of the patient's gum. On the other hand, since the outer circumferential surface of the cuff portion 360 of the present invention is formed of an elongated S-shaped curved surface, the impulse profile can be formed very accurately by the impression preparation.

As shown in FIG. 3, the screw 200 may include an upper head 220, an intermediate portion 240, and a lower end 260 integrally formed thereon.

The head 220 may be formed with a hexagonal groove so that a hexagonal wrench can be inserted and rotated on the upper surface thereof. The outer circumferential surface of the head 220 may be formed as a curved surface whose outer diameter gradually decreases as it goes downward. A curved curved surface 130 may be formed at a lower portion of the upper hole 120 of the prosthesis 100 to support the head 220.

The side contour of the head 220 may be formed in an inclined linear shape. In other words, the side surface of the head 220 may be tapered at a predetermined angle.

Alternatively, the side contour of the head 220 may be curved downwardly. Particularly, it is preferable that the curved line has a curved surface shape in which the radius of curvature becomes smaller as it goes downward.

The intermediate portion 240 extends downward from the lower end of the head portion 220 and has a hollow cylindrical shape. The lower part of the intermediate part 240 is formed to have the same diameter, but the upper part of the intermediate part 240 is preferably formed of a tapered part 250 formed in a shape in which the diameter becomes smaller constantly as it goes down.

The tapered portion 250 is extended from the post 320 when the screw 200 passes through the abutment 300 and is fastened to the fixture 400 so that the post portion is inserted into the insertion hole 110) inner circumferential surface. Thus, the tapered portion 250 opens the post 320 to be pressed and fixed on the inner circumferential surface of the lower end hole 160 of the prosthesis 100.

The lower end portion 260 is formed with a thread and can be fastened to the threaded portion 440 formed on the inner circumferential surface of the fixture 400. A screw portion 370 is also formed on the inner circumferential surface of the cuff portion 360 of the abutment 300 so that the lower end portion 260 of the screw 200 is inserted into the abutment 300 The threaded portion 370 may be temporarily fastened.

As shown in FIG. 4, the fixture 400 may be an artificial root embedded in the alveolar bone, and may be formed as a hollow pipe as a whole. The fixture 400 includes an attachment engaging portion 420 to which an abutting portion 380 of the abutment 300 is inserted and coupled to an upper end portion of the inner circumferential surface, a screw portion 440 formed at a lower portion of the inner circumferential surface, And a threaded portion 460 formed as a whole.

The attachment coupling portion 420 is formed to have an inner diameter larger than the inner diameter of the lower portion of the fixture 400, so that the boundary portion with the lower portion is stepped. In addition, the attaching portion 380 has a hexagonal column shape, and the attachment engaging portion 420 has a hexagonal groove shape. Thus, the mounting portion 380 of the abutment 300 is engaged so as not to rotate relative to the attachment coupling portion 420 of the fixture 400.

The threaded portion 260 of the screw 200 is fastened to the inner surface threaded portion 440.

The outer circumferential surface threaded portion 460 may be formed of a triangular screw so that the outer circumferential surface threaded portion 460 can be inserted into the alveolar bone while being pierced. Alternatively, the outer circumferential surface threaded portion 460 may be formed as a triangular screw.

It is preferable that a circular slot 323 having a larger diameter than the width of the incision groove is formed in the lower end of the incision groove 322 formed in the post 320 of the abutment 300. The circular slot 323 may have a larger diameter than the width of the incision groove 322 and may be continuously formed at the lower end of the incision groove.

The cutout groove 322 allows the post portion 320 to be resiliently deformed, but stress can be concentrated particularly at the lower end of the cutout groove 322 when the post portion 320 is deformed. The circular slot 323 can disperse stress concentrated at the lower end of the incision groove 322 to prevent the periphery of the incision groove 322 from being broken.

The post 320 of the abutment 300 includes a plurality of protrusions 325 formed on an outer circumferential surface thereof and the inner circumferential surface of the prosthesis 100 has a plurality of support grooves 165).

The plurality of protrusions 325 may be disposed at the upper center of the outer surface of the side wall partitioned by the cutout groove 322 in the post 320.

As shown in FIG. 4, the protrusions 325 may be triangular when viewed from the side. The distance between the outer ends of the pair of protrusions 325 facing each other is formed to be slightly larger than the inner diameter of the lower end hole 160 of the above-described prosthesis 100 in the embodiment in which four protrusions 325 are formed in total. Therefore, when the post 320 is inserted into the lower hole 160, the upper portion of the post 320 may be elastically deformed to be slightly reduced.

 On the inner surface of the lower end hole 160 of the prosthesis 100, a plurality of support grooves 165 are formed in a shape corresponding to the plurality of protrusions 325. When the post 320 is fully inserted into the lower hole 160, the protrusions 325 are inserted into the plurality of the support grooves 165 and the abutment 300 and the prosthesis 100 are inserted They can be temporarily coupled to each other.

The shape of the protrusion 325 may be a trapezoidal shape to a square shape, an arcuate shape to an elliptic arc shape, or a convex curved shape. At this time, the support groove 165 may have a groove shape corresponding to the shape of the protrusion 325.

Preferably, the thickness of the post 320 of the abutment 300 gradually decreases toward the upper side.

The post 320 is elastically deformed to be extended by the tapered portion 250 of the screw 200 and is pressed and fixed to the lower end hole 160 of the prosthesis 100. Therefore, the post portion 320 is formed so that its thickness decreases gradually toward the top in consideration of the amount of deformation before and after expansion, so that the elastic deformation can be made easier and the fixing strength can be increased.

Next, a method of assembling an abutment assembly according to an embodiment of the present invention will be described with reference to FIGS. 3 to 6. FIG. The components of the abutment assembly may be applied to prostheses, abutments, screws, and fixtures as described above.

In the first step, the upper post 320 of the abutment 300 is inserted into the insertion hole 110 of the prosthesis 100 so that the projection 325 formed on the outer surface of the post 320 Is inserted and fixed in a support groove formed in the inner surface of the inlet hole.

As described above, when the post 320 is inserted into the lower end hole 160, the outermost end of the protrusion 325 is pushed by the lower end hole 160 so that the upper portion of the post 320 is elastically contracted When the protrusion 325 is inserted into the support groove 165, the abutment 300 and the prosthesis 100 shown in FIG. 3 can be temporarily coupled to each other.

In the second step, the screw 200 is inserted into the inlet hole 110 of the prosthesis 100 and the lower threaded portion 260 of the screw is fastened to the inner surface threaded portion 440 of the abutment 300 do.

The post 200 of the abutment 300 is inserted into the lower end hole 160 of the prosthesis 100 and the lower end 260 of the abutment 300 is inserted into the abutment 300 The inner circumferential surface thread portion 440 of the inner circumferential surface thread portion 440. As a result, the abutment 300 and the screw 200 are temporarily coupled to the prosthesis 100 as shown in FIG.

In the third step, the lower end mounting portion 380 of the abutment 300 is inserted into the abutment engaging portion 420 of the fixture 400 and engaged.

4, the hexagonal bolt-shaped mounting portion 380 of the abutment 300 is inserted into the abutment coupling portion 420 of the fixture 400 and is seated thereon. Then, the abutment 300 is relatively non-rotatably seated in the fixture 400.

In the fourth step, the screw 200 is rotated to fasten the lower screw portion 260 to the inner surface screw portion 440 of the fixture 400.

When the screw 200 is further rotated in a state where the lower end portion 380 of the abutment 300 is seated on the abutment engagement portion 420 of the fixture 400, The lower end portion 260 fastened to the inner circumferential surface threaded portion 370 of the inner circumferential surface threaded portion 370 is lowered below the abutment 300.

Then, the screw 200 is rotated by a wrench to insert the lower end portion 260 thereof into the inner circumferential surface threaded portion 440 of the fixture 400 and start to tighten. 5, the tapered portion 250 of the screw 200 expands the post 320 of the abutment 300. As shown in FIG.

The lower end portion 260 is fastened to the inner circumferential surface threaded portion 440 of the fixture 400 until the head portion 220 contacts the inclined curved surface 130 of the prosthesis 100 and is compressed . At this time, the tapered portion 250 compresses the post 320 to the lower end hole 160 of the prosthesis 100, so that the post 320 is completely adhered.

The prosthesis 100 and the abutment 300 can be firmly coupled to the fixture 400 by the screw 200 while the abutment 300 is firmly coupled to the prosthesis 100. [

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Changes will be possible.

100: prosthesis 110: inlet hole
120: upper end hole part 130: inclined curved surface
140: stop jaw portion 160: lower end hole portion
165: Support groove
200: screw 220: head
240: intermediate portion 250: tapered portion
260: Lower end
300: abutment 310: center hole
320: post portion 322: incision groove
323: Slot 325:
340: an extended blade part 360: a cuff part
370: screw portion 380:
400: Fixture 420: Abutment coupling part
440: inner circumferential surface thread portion 460: outer circumferential surface thread portion

Claims (8)

A prosthesis in which a lead-in hole is formed;
An upper end post inserted into and joined to the prosthesis; a lower end insertion portion inserted into a fixture fixed to the alveolar bone; and an extension of an abutment extending laterally between the insertion and post portions to support the prosthesis An abutment including a blade portion and a cuff portion connected between the elongate blade portion and the abutment portion and having an outer circumferential surface formed in an elongated S-shaped curved shape so as to be advantageous in forming an emergence profile, ; And
And a screw inserted through the prosthesis and inserted into the abutment,
The post portion of the abutment includes a plurality of cutting grooves formed vertically from the top, and a circular slot having a diameter larger than a width of the cutting groove is formed at a lower end of the cutting groove,
Wherein the post portion of the abutment is formed so that its thickness becomes smaller as it goes up, and includes a plurality of protrusions formed on the outer circumferential surface,
The prosthesis includes a plurality of support grooves into which the plurality of protrusions are inserted,
The tapered portion is formed on the outer circumferential surface of the intermediate portion so that when the screw is inserted into the post portion and the lower end thread portion of the screw is fastened to the inner circumferential thread portion of the fixture, the tapered portion expands the post portion, To be pressed on the inner peripheral surface of the hole,
Wherein an outer circumferential surface of the head of the screw is formed as a curved surface whose outer diameter gradually decreases as it goes downward, and is supported on an inclined curved surface formed at an intermediate portion of the prosthesis. delete delete delete delete delete delete delete

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