KR102454967B1 - Dental Implant system - Google Patents

Abstract

The present invention relates to a dental implant system. The dental implant system of the present invention comprises: a fixture including a recess on the upper side thereof and a screw hole on the lower side thereof; an abutment; a crown; a screw; and a fixing unit. Therefore, the present invention has the effect of firmly fixing the crown and the abutment and preventing the loosening of the screw.

Description

Dental implant system {Dental Implant system}

The present invention relates to a dental implant system, and more particularly, to a dental implant system in which an abutment and an abutment and a crown can be firmly and reliably fixed.

The dental implant system refers to a system used to implant artificial teeth that function as original teeth by implanting an artificial tooth root made of special metal into the alveolar bone without damaging the surrounding teeth in the area where the tooth is missing.

Typically, a dental implant system includes a fixture, an abutment seated on the upper side of the fixture, a crown (ie, artificial crown) coupled to cover the upper portion of the abutment, and an abutment seated on the upper side of the fixture to fix the abutment to the fixture. It includes a screw that passes through the abutment and is fastened to the fixture.

Previously, cement was used for bonding the crown and the abutment. However, bonding between the crown and the abutment with cement has a problem of poor reliability. In particular, joining a crown made of a zirconia material to an abutment made of a metal material is more and more unreliable. The implant system using cement for bonding between the abutment and the crown shortens the adhesive life due to repeated mastication after the procedure, and thus there is a risk of separation between the abutment and the crown.

On the other hand, a tapered part is formed in the head of the screw, and a plurality of incision grooves are provided on the abutment. By pressing and in close contact with the crown, a technique for fixing between the abutment and the crown has been proposed.

However, in the prior art, it was difficult to ensure reliable fixation between the abutment and the crown because the lower region in the hollow of the strut pressed by the head of the screw was very limited. In addition, due to the nature of the material constituting the abutment (eg, titanium alloy), there is a limitation in the expansion due to elastic deformation only when the incision is formed, making it difficult to put into practical use.

JP2017-536166 (2017. 12. 07. Disclosure) Republic of Korea Patent Registration No. 10-1937300 (Registered on 2019. 01. 04.) Korean Patent Publication No. 10-2014-0018674 (published on February 13, 2014) Korean Patent Registration No. 10-2214903 (Registered on February 4, 2021)

The problem to be solved by the present invention is to expand the ring-type leaf spring facing the crown by the cooperation of the inclined portion formed on the head of the screw by the fastening of the screw and the balls movable in the radial direction by the inclined portion to expand the ring-type plate spring. An object of the present invention is to provide a dental implant system capable of fixing between the crown and the abutment and preventing loosening of the screw by the leaf spring being in close contact with the crown.

A dental implant system according to an aspect of the present invention is embedded in the alveolar bone by a screw thread, the fixture including an upper recess and a lower screw hole; an abutment having a lower portion inserted into the recess and seated on the fixture, the abutment including a hollow elongated in the vertical direction; a crown seated on the abutment, the crown including a lower hole into which the upper portion of the abutment is inserted, and an upper hole allowing the insertion of a wrench; Before the crown is seated on the abutment, the screw is temporarily assembled to the abutment, and after the crown is seated on the abutment, the screw is completely fastened to the fixture; and a fixing unit for fixing between the abutment and the crown in cooperation with the screw while the screw is fastened to the fixture, the fixing unit comprising: an annular recess formed around the upper outer surface of the abutment; A plurality of ball holes formed at regular intervals on the inner base surface of the annular recess, a plurality of balls protruding inwardly of the hollow while accommodated in each of the plurality of ball holes, and in a non-expanded state as a whole, lie on the inside of the outer surface of the abutment and an annular leaf spring installed in the annular recess to be hidden, and providing a biasing force for projecting the plurality of balls into the hollow in the non-expanded state, wherein the screw is located in the screw hole of the fixture. A screw portion to be screwed, and a head portion formed on the upper side of the screw portion and having an inclined portion, wherein the head portion descends along the inclined surface in the hollow of the abutment as the screw fastening progresses and moves the plurality of balls radially outward. to expand the annular leaf spring in a radially outward direction, and the annular leaf spring is expanded in a radially outward direction to be pressed into tight contact with the inner surface of the crown.

According to an embodiment, between both ends of the annular leaf spring, a slit that opens when the annular leaf spring expands in a radially outward direction is formed, and on the inner surface of the crown, a portion of the annular leaf spring extended in a radially outward direction An engaging groove engaged with the .

According to one embodiment, in a state in which the crown is seated on the abutment, a gap exists between the upper end of the abutment and the ceiling surface of the lower hole, and a certain length downward from the top of the abutment on the upper outer surface of the abutment. An extended groove is formed, and an adhesive material fills the lower hole and at the same time fills the gap between the abutment and the crown through the gap and the groove.

The dental implant system according to the present invention expands the ring-shaped leaf spring facing the crown by the cooperation of the inclined portion formed on the head of the screw by the fastening of the screw and the balls movable in the radial direction by the inclined portion to expand the ring-type By the leaf spring is in close contact with the crown, it has the effect of firmly fixing between the crown and the abutment and preventing loosening of the screw.

Many other advantages and effects of the present invention can be understood through the description of the embodiments below.

1 is a cross-sectional view showing a dental implant system according to an embodiment of the present invention in a screw-completely fastened state;
Figure 2 is a cross-sectional view showing a dental implant system according to an embodiment of the present invention in a screw provisionally assembled state,
3 is an exploded view showing a dental implant system according to an embodiment of the present invention,
4 is a perspective view showing an abutment of the dental implant system in FIGS. 1 to 3,
Figure 5 is an exploded perspective view showing the abutment of the dental implant system shown in Figure 4,
6 is a view for explaining another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation.

In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or operator. These terms should be interpreted as meanings and concepts consistent with the technical spirit of the present invention based on the contents throughout this specification.

In order to clearly explain the present invention, the description of parts not related to the technical idea of the present invention is omitted, and the same reference numerals are given to the same or similar elements throughout the specification.

In addition, in various embodiments, components having the same configuration will be described using the same reference numerals only in the representative embodiment, and only configurations different from the representative embodiment will be described in other embodiments.

Throughout the specification, when a part is "connected" to another part, it includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another member interposed therebetween. In addition, when a part "includes" a certain component, this may mean further including other components, not excluding other components, unless otherwise stated.

1 is a cross-sectional view showing a dental implant system according to an embodiment of the present invention in a fully screwed state, and FIG. 2 is a cross-sectional view showing a dental implant system according to an embodiment of the present invention in a state of temporarily assembled with screws 3 is an exploded view showing a dental implant system according to an embodiment of the present invention, FIG. 4 is a perspective view showing an abutment of the dental implant system in FIGS. 1 to 3, and FIG. 5 is a dental implant system shown in FIG. It is an exploded perspective view showing the abutment.

1 to 5, the dental implant system according to an embodiment of the present invention includes a fixture 100 that is implanted in the alveolar bone, and an abutment 200 that is seated on the upper portion of the fixture 100. With the crown 300 seated on the abutment 200, and before the crown 300 is seated on the abutment 200, as shown in FIG. 2, it is temporarily assembled on the abutment 200, and the After the crown 300 is seated on the abutment 200 , as shown in FIG. 1 , the screw 400 fully fastened to the fixture 100 and the screw 400 are connected to the fixture 100 . ) cooperates with the screw 400 while being fastened to, and includes a fixing unit for firmly fixing between the abutment 200 and the crown 500.

Here, the provisional assembly state is a state before the screw 400 is completely fastened to the screw hole of the fixture 100, and the screw to the extent that it allows the crown 300 to be completely seated on the abutment 200. (400) means a state in which the fastening has progressed.

In order to perform an implant procedure using a dental implant system, a hole should be formed in the patient's alveolar bone. A tool such as a drill is used to form the buried hole. And, the fixture 100 includes a screw thread 120 formed on the outer circumferential surface, and the screw thread 120 is screwed into the implanted hole, thereby being firmly fixed to the alveolar bone.

In addition, the fixture 100 includes a hole formed to extend in a vertical direction from an upper end, and the hole is composed of an upper recess 112 and a lower screw hole 114 . The recess 112 is a portion into which the lower portion of the abutment 200 is inserted and seated, as will be described in detail below, and is preferably formed in a polygonal cross section. The screw hole 114 is a hole having a cross-sectional size smaller than the cross-sectional size of the recess 112 , and a female thread to which the screw 400 is fastened is formed on an inner surface of the screw hole 114 . The fixture 100 is preferably formed of a material having excellent biocompatibility and high hardness, such as zirconia or Ti.

In addition, the abutment 200 is inserted into the recess 112, a lower portion including a polygonal cross-section, and a middle portion that is formed to gradually increase the cross-sectional size from the upper end of the lower portion to support the lower end of the crown 300 and an upper portion formed on the upper side of the middle portion and inserted into the crown 300 .

In addition, the abutment 200 includes a hollow 210 elongated in the vertical direction over the entire height from the top to the bottom, and the hollow includes an inclined surface that gradually converges toward the center as it goes down. and an upper hollow and a lower hollow having a cross-sectional size smaller than the smallest cross-sectional size of the upper hollow.

The fixing unit is provided on the abutment (200). The fixing unit includes an annular recess 270 formed to have a predetermined vertical width around the upper outer surface of the abutment 200, and a plurality of ball holes 280 formed at regular intervals on the inner base surface of the annular recess 510. And, a plurality of balls 520 protruding to the inside of the hollow 210 while accommodated in each of the plurality of ball holes 280, and the abutment 200 as a whole in a non-expanded state so as to be placed on the inside of the outer surface of the abutment 200 so as to be hidden and an annular leaf spring 540 installed in the annular recess 270 and providing a biasing force for projecting the plurality of balls 520 into the hollow 210 in the non-expanded state. The annular plate spring 540 is formed by bending a bar-shaped plate having a certain thickness in a circular shape, and is configured to expand radially outwardly by an external force in the opposite direction that overcomes the elastic force toward the inner radius. In addition, a slit 542 is present between the two ends of the annular plate spring 540 , and the slit 542 is opened when the annular plate spring 540 is expanded.

The crown 300 is, for example, formed of a zirconia material and serves as an artificial tooth, and is coupled to cover the upper portion 240 of the abutment 200 . To this end, the crown 300 includes a lower hole 320 into which the upper portion 240 of the abutment 200 is inserted and an upper hole 340 for allowing insertion of a wrench for fastening the screw 400 . .

At this time, the lower hole 320 and the upper hole 340 are connected to each other, and the cross-sectional size of the upper hole 340 is at the boundary between the lower hole 320 and the upper hole 340 . (320) A step is formed due to being smaller than the cross-sectional size. When the annular plate spring 540 extends radially outward, the outer peripheral surface of the expanded annular plate spring 540 is strongly pressed against the inner surface of the lower hole 320, and by this pressing, the crown ( 300) may be fixed to the abutment (200). Furthermore, an engagement groove 322 engaged with the annular plate spring 540 extending outward in the radial direction is formed on the inner surface of the crown 300 . In the engagement 322, the vertical movement of the crown 300 is suppressed due to the engagement of the annular plate spring 540, and in this engagement state, the outer surface of the annular plate spring 540 is the engagement groove 322 ) is strongly pressed against the inner surface of the crown, so more reliable fixation of the crown 300 is ensured.

In a state in which the crown 300 is seated on the abutment 200, a gap g exists between the upper end of the abutment 200 and the ceiling surface of the lower hole 320, and when the adhesive material is filled, the The adhesive material flows into the gap between the crown 300 and the abutment 200 through the gap g, thereby more strongly fixing between the crown 300 and the abutment 200 .

In addition, the screw 400 includes a screw portion 420 screwed into the screw hole 114 of the fixture 100 and a head portion 440 formed above the screw portion 420 . The head part 440 pushes the plurality of balls 520 outward in the radial direction while descending along the hollow inner slope of the abutment 200 while descending according to the fastening progress of the screw 400, and is in contact with the annular plate. The spring 540 extends radially outward. In the non-expanded state, the leaf spring 540, which was completely hidden within the annular recess 270, is partially protruded out of the annular recess 270 due to expansion elastic deformation and engaged with the engaging groove 322. At the same time, it can be strongly pressed into the crown 300 within the engaging groove 322 .

As mentioned above, the head portion 400 of the screw 400 includes an inclined portion, and the annular leaf spring ( 540) is expanded radially outward so that the annular leaf spring 540 is strongly adhered to the inner surface of the lower hole 320 of the crown 300, in particular, the inner surface of the engaging groove 322.

In addition, a non-circular cross-section wrench hole 425 is formed on the upper surface of the head 420 to engage a non-circular cross-section wrench (not shown) for rotation of the screw 200 . The inner diameter of the upper hole 340 of the crown 300 has a smaller cross-sectional area than the cross-sectional area of the wrench to allow passage of the wrench.

In addition, since a strong pressing force and a frictional force simultaneously act between the ball 520 and the head part 420 , it may serve to suppress loosening of the screw 200 .

In addition, in the dental implant system according to the present embodiment, adhesive materials 620 and 640 are formed in the upper hole 320 and the lower hole 340 of the crown 300 to cover the post 200 and the screw 400 . is charged At this time, one type of adhesive material can be used as the adhesive materials 620 and 640 , but in the present embodiment, the dental implant system has the first adhesive material 620 filled in the lower hole 340 and the upper arc hole 640 . The filling second adhesive material 640 may include a different type. As the first adhesive material 620 , an adhesive material having excellent adhesive strength is used, and as the second adhesive material 640 , the first adhesive material 620 has a lower adhesive strength than the first adhesive material 620 , but the crown 300 ) and an adhesive material with a small color difference can be used.

6 is a view for explaining another embodiment of the present invention.

Referring to FIG. 6 , a plurality of grooves 202 extending down a predetermined length from the top of the abutment 200 are formed in the upper portion of the outer surface of the abutment 200 . In addition, as in the previous embodiment, the dental implant system is first and sequentially filled in the lower hole 340 and the upper hole 320 of the crown 300 to cover the post 200 and the screw 400 The second adhesive materials 620 and 640 are filled. The first adhesive material 620 may fill the lower hole 340 with a sufficient filling amount between the abutment 200 and the crown 300 through the gap g and the groove 202 at the same time. .

Since the remaining components are almost similar to those of the previous embodiment, descriptions thereof will be omitted to avoid duplication.

Note that the present invention is not limited by the above-described embodiments and can be practiced with various modifications.

100 ............................... Fixture
200...............................Abutment
270...............................Annular recess
280 ...............................Ball hole
300...............................CROWN
400 ...............................Screw
520.................................................Ball
540 ...............................Annular leaf spring

Claims (3)

A fixture that is embedded in the alveolar bone by a screw thread, and includes an upper recess and a lower screw hole;
an abutment having a lower portion inserted into the recess and seated on the fixture, the abutment including a hollow elongated in the vertical direction;
a crown seated on the abutment, the crown including a lower hole into which the upper portion of the abutment is inserted, and an upper hole allowing the insertion of a wrench;
Before the crown is seated on the abutment, the screw is temporarily assembled to the abutment, and after the crown is seated on the abutment, the screw is completely fastened to the fixture; and
and a fixing unit for fixing between the abutment and the crown by cooperating with the screw while the screw is fastened to the fixture,
The fixed unit is
an annular recess formed around the upper outer surface of the abutment;
a plurality of ball holes formed at regular intervals on the inner base surface of the annular recess;
A plurality of balls protruding to the inside of the hollow while accommodated in each of the plurality of ball holes,
In the non-expanded state, it is installed in the annular recess so as to be completely hidden from the outer surface of the abutment, and in the non-expanded state, it includes an annular leaf spring providing a biasing force to project the plurality of balls into the hollow. and
The screw is
a screw portion screwed into the screw hole of the fixture;
It is formed on the upper side of the screw portion and includes a head portion having an inclined portion,
The head part pushes the plurality of balls radially outward while descending along the hollow inner slope of the abutment according to the fastening progress of the screw, thereby expanding the annular leaf spring in the radially outward direction,
The annular leaf spring is expanded in a radially outward direction and pressed into close contact with the inner surface of the crown,
Between both ends of the annular leaf spring, a slit that opens when the annular leaf spring expands in a radially outward direction is formed, and on the inner surface of the crown is engaged with a part of the annular leaf spring extended in a radially outward direction,
In a state in which the crown is seated on the abutment, a gap exists between the upper end of the abutment and the ceiling surface of the lower hole, and a groove extending a certain length downward from the upper end of the abutment is formed on the upper outer surface of the abutment and , A dental implant system, characterized in that the adhesive material fills the lower hole and at the same time fills the gap between the abutment and the crown through the gap and the groove.
delete delete

Images