KR102642982B1 - Cementless abutment assembly - Google Patents

Abstract

Disclosed is a cementless abutment assembly that has a structure that prevents foreign substances from penetrating when fixing an upper prosthesis to an abutment and that allows a feeling of connection when fastened. The cementless abutment assembly according to the present invention includes a fixture installed in the alveolar bone; An abutment that is inserted and fixed into the central hole of the fixture, has an expansion portion divided into a plurality of parts so that the upper end can be opened outward about a central axis, and has a coupling protrusion at an end of the expansion portion that protrudes outward. ; In a state covered to cover a portion of the upper part of the abutment, it is fixed to the abutment by passing through a through hole and fastening a screw to the fixture, and as the screw is fastened, the expanded portion of the abutment opens outward. A crown having a coupling groove into which the coupling protrusion is inserted; And a screw that penetrates the crown and the abutment and is fastened to the fixture while expanding the expansion portion so that the coupling protrusion is inserted into the coupling groove, thereby fixing the crown and the abutment to the fixture. A protrusion or groove for confirmation of engagement is formed on one side of the screw, and a groove or protrusion for confirmation of engagement corresponding to the protrusion or groove for confirmation of engagement is formed on the abutment, so that the protrusion for confirmation of engagement is engaged when inserted into the groove. It can provide a feeling.

Description

Cementless abutment assembly {Cementless abutment assembly}

The present invention relates to a cementless abutment assembly, and more specifically, to a cementless abutment assembly that has a structure that prevents foreign substances from penetrating when fixing an upper prosthesis to the abutment and that allows a feeling of connection when fastened.

Generally, if a natural tooth is broken or falls out of the alveolar bone due to negligence or carelessness, it is impossible to chew food, so an implant is placed in the alveolar bone in that area and an artificial tooth (crown) is fixed on the top of the tooth. It is used as a replacement for natural teeth.

These implants are either replacements for lost natural teeth, or a fixture is implanted in the alveolar bone to fuse with the alveolar bone for a certain period of time, and then a prosthesis such as an abutment or artificial tooth is fixed on top of the original function of the tooth. refers to a dental procedure that restores

The conventional fixture has threads formed on the outer peripheral surface and an abutment fastened to the upper part so that it can be installed in the alveolar bone. The conventional abutment is formed with an insertion hole and a hexagonal groove penetrating each other at the upper and lower parts of the inside, and the insertion hole and the hexagonal groove are in contact with each other. A step is formed in the area, and the fixing screw that secures it has various structures, such as a head with a concave hexagonal wrench groove at the top center and a screw portion at the bottom.

The abutment of the conventional crown implant constructed as described above is installed so that the hexagonal groove is inserted into the hexagonal head protruding from the top of the fixture embedded in the jawbone, and then the fixing screw is inserted through the insertion hole of the abutment. Then, the abutment is firmly fixed by fastening the threaded part of the fixing screw to the fastener of the fixture using a fastening tool, and then an artificial tooth is inserted and bonded to the outer peripheral surface of the top of the abutment using dental cement. .

Since this conventional abutment assembly is a method in which the abutment fastened to the fixture is screwed and then applied cement to the inside of the crown to adhere and fix it, there is a risk that the cement in the oral cavity will come out as a foreign substance, and if this actually occurs, There was a problem with very large side effects occurring.

To solve the problems of the conventional abutment assembly using cement, a cementless abutment assembly was developed. Conventional cementless abutment assemblies have a problem in that it is difficult to determine whether perfect fastening exists, so there is a high possibility of incomplete fastening.

In addition, the conventional cementless abutment assembly had a problem in that saliva or residual food in the oral cavity penetrated the interior over a long period of time, causing hygiene problems and causing the crown, which is an upper prosthesis, to fall off.

Referring to Figure 1, an example of a cementless abutment assembly 10 according to the prior art is shown. In Figure 1, (a) shows the shape of the crown 13 applied to the front teeth, and (b) shows the shape of the crown 13 applied to the molars. In both cases, the screw 14 is shown fastened through the abutment 12. As the screw 14 is fastened and inserted, the tapered portion 14a presses the elastic support portion 12a outward, that is, expands and comes into close contact with the inner wall of the crown 13, thereby fixing the crown 13.

However, in the prior art, it is impossible to know whether the screw 14 is fully fastened to the correct position, and the fastening is not confirmed by simply feeling that the rotation of the tool 20 stops due to a certain force of the operator. There was a problem that occurred. Due to incorrect fastening of the screw 14, the prosthesis may be dislodged or fractured, causing considerable problems in dentistry.

In addition, in the prior art, since the screw 14 is fixed to the fixture by a screw connection method, the screw may loosen due to external force applied when chewing food, and the re-manufacturing of the prosthesis due to the loosening of the screw 14 may also occur. There was a problem.

In addition, in the case of the crown 13 applied to front teeth in Figure 1(a), there was a problem in that it could not be applied because it had to be manufactured excessively long due to its structure.

In addition, in the prior art, the screw 14 must be deeply inserted inward from the inlet of the abutment 12 to be fastened. Due to the almost limited space, it is difficult to enter the tool 20 at an angle, and the tool 20 is installed vertically. Because it had to be inserted, there was a problem that it was very difficult to give an angle when fastening the abutment and crown or fastening the screw.

The present invention is to solve the above problems, and the purpose of the present invention is to provide a cementless abutment assembly that has a structure that prevents foreign substances from entering the fastening area after screw fastening. It is done.

Another object of the present invention is to provide a cementless abutment assembly that can prevent incomplete fastening by allowing the operator to feel the connection with various sensations when fixing the upper prosthesis to the abutment with screws.

Another object of the present invention is to provide a cementless abutment assembly that can prevent the screw from rotating in the disassembly direction due to external force after the screw is stuck.

Another object of the present invention is to provide a structure in which fixation is immediately achieved when the screw is inserted to the crown thickness at the crown inlet, thereby providing a cementless abutment that can maximize the angle given when fastening the abutment and crown or screwing. The purpose is to provide a functional assembly.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

According to one aspect of the present invention, a fixture installed in the alveolar bone; An abutment that is inserted and fixed into the central hole of the fixture, has an expansion portion divided into a plurality of parts so that the upper end can be opened outward about a central axis, and has a coupling protrusion at an end of the expansion portion that protrudes outward. ; A crown having a coupling groove into which the coupling protrusion is inserted when the expanded portion of the abutment opens outward; And a screw that penetrates the crown and the abutment and is fastened to the fixture while expanding the expansion portion so that the coupling protrusion is inserted into the coupling groove, thereby fixing the crown and the abutment to the fixture. A cementless abutment assembly may be provided in which a protrusion or groove for confirming engagement is formed on one side of the screw, and a groove or protrusion for confirming engagement corresponding to the protrusion or groove for confirming engagement is formed on the abutment. there is.

At this time, when the screw is inserted and the engagement confirmation protrusion is inserted into the engagement confirmation groove, a feeling of engagement can be transmitted through the tool.

At this time, when the screw is fastened to the correct position, the screw can be prevented from rotating in reverse until an external force is applied to cause the engagement confirmation protrusion to separate from the state in which it is inserted into the engagement confirmation groove.

At this time, the feeling of coupling may provide a greater feeling of coupling as the coupling confirmation protrusion or groove is located closer to the top of the abutment than when it is positioned at the bottom of the expanded part under the same conditions.

At this time, a plurality of the coupling confirmation protrusions and the coupling confirmation grooves may be formed.

At this time, the height (h ₂ ) of the plurality of coupling confirmation protrusions and coupling confirmation grooves located at the bottom is the height of the coupling confirmation protrusions and coupling confirmation grooves located at the top ( h ₁ ) may be greater than the value.

At this time, the plurality of grooves may have different depths (C).

At this time, to fasten the screw in the correct position, the engagement confirmation protrusion may be closely inserted into the engagement confirmation groove.

At this time, when the screw is inserted and the coupling protrusion is closely inserted into the coupling groove, the coupling confirmation protrusion may also be inserted into the coupling confirmation groove.

At this time, the angle at which the expanded portion of the abutment opens may be 0 to 5 degrees.

At this time, the depth of the groove for confirming the connection of the abutment may be 1-8% of the maximum outer diameter of the abutment.

At this time, the lower inner diameter of the through hole of the crown may be smaller than the upper outer diameter of the abutment.

At this time, when the crown is inserted into the outer surface of the abutment, the diameter of the expanded portion may be reduced, and when the coupling protrusion reaches the coupling groove portion, the diameter of the expanded portion may be restored.

At this time, the protrusion length of the protrusion for checking the engagement of the screw may be formed to be smaller than the protrusion length of the protrusion for coupling the abutment.

At this time, the protrusion for confirming the engagement may be formed in the form of a sea ring.

At this time, the abutment has an abutment cap corresponding portion having a multi-angled protrusion with a direction, a fastening portion that is fastened to the polygonal protrusion, and an abutment having a coupling protrusion with an end of the expanded portion protruding outward. Can be assembled with a ment cap.

At this time, the length at which the screw is inserted for in-position fastening may be shorter than the distance between the extreme ends of the coupling protrusions.

At this time, the distance between the extreme ends of the coupling protrusions may be equal to or longer than the average diameter of the abutment expansion portion.

At this time, the distance between the extreme ends of the coupling protrusions may be equal to or shorter than the average diameter of the abutment.

According to the above configuration, the cementless abutment assembly according to the embodiment of the present invention is a cementless method that does not require cement application and adhesion, so it is possible to fundamentally prevent side effects that may occur due to seepage of cement, which is an adhesive. there is.

In the cementless abutment assembly according to an embodiment of the present invention, the coupling protrusion is inserted and fixed into the coupling groove by screw fastening, so complete entry can be confirmed, and the crown is firmly fixed to the abutment by increasing the fixing force. Therefore, it is possible to prevent departure.

The cementless abutment assembly according to an embodiment of the present invention allows the operator to check whether the crown is fully entered and fully adhered by the feeling of engagement during screw tightening.

The cementless abutment assembly according to an embodiment of the present invention can be fixed by pushing the screw from the top at the same time as the screw enters, rather than having the screw enter the inside of the abutment and push it out from the bottom, so the screw can be inserted deeply. There is no need to do this, and through this, the degree of freedom regarding the working angle of the tool can be increased.

In the cementless abutment assembly according to an embodiment of the present invention, when the screw is normally inserted into the abutment and fastened to the correct position, the feeling of coupling according to the fastening of the yin-yang angle protrusion and the groove can be confirmed, thereby creating a bond between the abutment and the crown, and It can be confirmed that a tight connection between the butt and the screw has been achieved.

Since the cementless abutment assembly according to an embodiment of the present invention is in a state in which the negative and positive angle protrusions and grooves of the screw and the abutment are combined after assembly, loosening of the screw due to external force generated during use can be prevented.

The cementless abutment assembly according to an embodiment of the present invention can be fixed at the same time as the screw enters the inside of the abutment, and the fastening of the abutment and the crown is dependent on the position and design in the oral cavity where the crown is seated. Angle can be given.

Figure 1 is a cross-sectional view of a cementless abutment assembly according to the prior art.
2A to 2C are cross-sectional views of cementless abutment assemblies before and after screw fastening according to different embodiments of the present invention.
Figure 3 is an exploded view of a cementless abutment assembly according to an embodiment of the present invention.
4A to 4B are plan views of abutments that are some components of a cementless abutment assembly according to different embodiments of the present invention.
5A to 5B are cross-sectional exploded views of cementless abutment assemblies according to different embodiments of the present invention.
Figure 6 is an operational diagram of the expansion portion of the abutment, which is a component of the cementless abutment assembly according to an embodiment of the present invention.
Figure 7 is a partial cross-sectional view of an abutment, which is a component of a cementless abutment assembly according to an embodiment of the present invention.
Figure 8 is a cross-sectional view of a state in which an angle is given to a tool of a cementless abutment assembly according to an embodiment of the present invention.
9 and 10 are front views showing various embodiments of screws, which are some components of the present invention.
Figure 11 is a cross-sectional view showing a section near the coupling groove according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention, parts not related to the description have been omitted in the drawings, and identical or similar components are given the same reference numerals throughout the specification.

The words and terms used in this specification and claims are not to be construed as limited in their usual or dictionary meanings, but according to the principle that the inventor can define terms and concepts in order to explain his or her invention in the best way. It must be interpreted with meaning and concepts consistent with technical ideas.

Therefore, the embodiments described in this specification and the configuration shown in the drawings correspond to a preferred embodiment of the present invention, and do not represent the entire technical idea of the present invention, so the configuration may be replaced by various alternatives at the time of filing of the present invention. There may be equivalents and variations.

In this specification, terms such as “comprise” or “have” are intended to describe the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to describe the presence of one or more other features. It should be understood that it does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

A component being “in front,” “rear,” “above,” or “below” another component means that it is in direct contact with the other component, unless there are special circumstances. This includes not only those placed at the “bottom” but also cases where another component is placed in the middle. In addition, the fact that a component is "connected" to another component includes not only being directly connected to each other, but also indirectly connected to each other, unless there are special circumstances.

Hereinafter, a cementless abutment assembly according to an embodiment of the present invention will be described with reference to the drawings.

Referring to FIGS. 2 to 8, the cementless abutment assembly 100 according to an embodiment of the present invention includes a fixture 110, an abutment 120, a crown 130, and a screw 140. Includes.

Referring to FIGS. 2 to 8, the fixture 110 is installed in the alveolar bone.

At this time, the fixture 110 has a general fixture shape. It extends in the longitudinal direction and takes the form of a bolt or screw, and a screw 111b that can be inserted into and fixed to the alveolar bone is formed on the outer surface.

At this time, the fixture 110 has a central hole 111 formed, a part of the abutment 120 is inserted and fixed into the central hole 111, and an internal hole is formed so that the screw 140 can be fastened therein. A fastening screw 111a is also formed.

At this time, the central hole 111 of the fixture 110 may have a diameter that decreases from the entrance.

Referring to FIGS. 2 to 8, the abutment 120 is inserted and fixed into the central hole 111 of the fixture 110, and the upper end is divided into a plurality of pieces so that it can be opened outward around the central axis. An expanded portion 123 is formed, and an end of the expanded portion 123 may be provided with a coupling protrusion 122b protruding outward.

At this time, the abutment 120 is a part that functions as an abutment, and while it is fixed to the fixture 110, the crown 130, which is an upper prosthesis, can be coupled and fixed to the upper part. Therefore, it plays the primary role of supporting the crown 130, which is an artificial tooth.

At this time, the abutment 120 has a through hole 120a formed at the center along the longitudinal direction so that the screw 140 can pass through.

At this time, the abutment 120 has an upper body 122 and a lower body 121 integrated into it. The lower body 121 is a part that is inserted into the fixture 110 and fixed by the screw 140, and the upper body 122 has several incisions 122a formed along the longitudinal direction so that it can be opened outward. It may have a divided expansion portion 123. A coupling protrusion 122b is formed at the top, and the coupling protrusion 122b is inserted into the coupling groove 132 of the crown 130, so that the crown 130 can be fixed to the abutment 120. . Here, when the screw 140 is inserted and the coupling protrusion 122b is inserted into the coupling groove 132, a feeling of coupling may be transmitted through the tool 20. This feeling of coupling can be transmitted along with the feeling of coupling of the coupling confirmation protrusion 142a and the groove portion 122c, which will be described later. Due to this feeling of connection, the operator can check whether the crown 130 is fully inserted and fastened in the correct position while fastening the screw 140.

At this time, referring to FIG. 6, the angle at which the expanded portion 123 of the abutment 120 is opened may be 0 to 5 degrees. That is, the crown 120 can be firmly fastened to the abutment 120 even though the opening angle range is small.

At this time, a flange portion 121b is formed at the upper end of the lower body 121, and the lower end of the crown 130 is caught and adhered to this flange portion 121b, thereby attaching the crown 130 to the abutment 120 from the lower part. can support. As the lower body 121 descends from the top to the bottom, a tapered portion 121a is formed so that the lower body 121 can be fixed by the screw 140 while a portion of the lower body 121 is inserted into the fixture 110.

At this time, a coupling confirmation groove 122c is formed inside the upper body 122 of the abutment 120, and the coupling confirmation groove 122c has a coupling confirmation protrusion 142a of the screw 140. When fastening the screw 140, it is inserted to provide a sense of coupling.

At this time, referring to FIG. 7, the depth (C) of the coupling confirmation groove portion (122c) of the abutment (120) may be 1 to 8% of the maximum outer diameter (B) of the abutment (120). Here, the maximum outer diameter of the abutment 120 may be the maximum outer diameter of the flange portion 121b. This ratio can maximize the coupling feeling and screw rotation prevention function by appropriately adjusting the depth of the coupling groove 122c compared to the body of the abutment 120.

At this time, a locking jaw 121c is formed inside the lower body 121 of the abutment 120, and the locking jaw 140a of the screw 140 is caught on the catching jaw 121c so that it cannot be inserted further. It is prohibited.

At this time, titanium, a biocompatible material, may be used as the material of the abutment 110.

Referring to FIGS. 2 to 8, the crown 130 passes through the through hole 131 in a state covered to cover a portion of the upper part of the abutment 130, and the screw 140 is inserted into the fixture 110. It is fixed to the abutment 120 by fastening, and as the screw 140 is fastened, the expanded portion 123 of the abutment 110 opens outward and the coupling protrusion 122b is inserted. A coupling groove 132 may be formed.

At this time, the crown 130 is an artificial tooth and forms an upper prosthesis. Therefore, after the implant procedure, the crown 130 is visually exposed to the outside as an artificial tooth and becomes a product that directly contacts food to be chewed. Therefore, the crown 130 must be coupled and fixed as firmly as possible to the abutment 120, which is an abutment. Conventionally, in order to firmly fix the crown 130 to the abutment 120, cement, an adhesive, is used to bond and fix it, so the coupling structure between the crown 130 and the abutment 120 is very simple, and the coupling surface is very simple. They were just made to match each other. In the present invention, since the crown 130 must be fixed without cement, that is, without adhesive, the joint structure of the abutment 120 and the crown 130 is not simple.

At this time, a through hole 131 is formed along the longitudinal direction of the crown 130 so that the screw 140 and the upper body 122 of the abutment 120 can be inserted. The abutment 120 is initially inserted into the through hole 131 and comes into close contact with the inner surface, and in that state, the screw 140 enters again and is coupled. Here, the crown 130 is actually fixed by the upper body 122 of the abutment 120 being spread outward.

Referring to FIGS. 2 to 8, the screw 140 penetrates the crown 130 and the abutment 120 and is fastened to the fixture 110 to expand the expansion portion 123. The crown 130 and the abutment 120 can be fixed to the fixture 110 by inserting the coupling protrusion 122b into the coupling groove 132.

At this time, the screw 140 consists of an upper body 142 and a lower body 141, and a locking jaw 140a is formed at the boundary between the upper body 142 and the lower body 141. This locking jaw 140a is caught on the inner locking jaw 121c of the abutment 120 to prevent the screw 140 from being further inserted into the abutment 120, and this point is the screw ( 140) is a position where it can be inserted into the abutment 120 as much as possible. At this time, the protrusion 142a for confirmation of coupling of the screw 140 may be at a position corresponding to the groove 122c for confirmation of coupling of the abutment 120.

At this time, the upper body 142 of the screw 140 is formed with a protrusion 142a for confirmation of engagement as described above, and a tapered portion 142b is formed at the top of the head 142c of the upper body 142. The expanded portion 123 of the butment 120 is formed to spread outward. That is, the diameter of the head 142c is formed to be larger than the diameter of the upper body 142 of the screw 140. In addition, the lower body 141 has a smaller diameter than the upper body 142, and a screw 141a is formed on the lower body 141 so that it can be fastened to the internal screw 111a of the fixture 110.

Ultimately, a protrusion 142a or a groove for confirmation of engagement is formed on one side of the screw 140, and a groove 122c for confirmation of engagement corresponding to the protrusion 142a or groove for confirmation of engagement is formed on the abutment 120. ) Or a protrusion may be formed to provide a feeling of engagement when the engagement confirmation protrusion 142a is inserted into the groove 122c.

At this time, the feeling of connection may be generated by the operator's sense of touch or hearing, and other senses may also generate this feeling of connection.

At this time, the lower inner diameter of the through hole 131 of the crown 130 may be smaller than the upper outer diameter of the abutment 120. This is because the expanded portion 123 may not only spread out but also heal slightly inward. By being formed in this way, the crown 130 can be more firmly fixed in close contact with the abutment 120.

At this time, before the crown 130 is fastened by the screw 140, when it is inserted into the outer surface of the abutment 120, the expanded portion 123 is reduced in diameter and the coupling protrusion 122b is When the coupling groove 132 is reached, the coupling protrusion 122b may be partially inserted into the coupling groove 132. The shrinking and expansion of the expansion portion 123 may be due to the elastic material properties of the abutment 120, and since various materials have these slightly elastic material properties, various materials can be applied. there is. Of course, here, titanium can be used as the material of the abutment 120, and this material will also satisfy the elastic material characteristics.

At this time, the screw 140 opens the end of the expanded portion 123 outward during fastening so that the coupling protrusion 122b can be closely inserted into the coupling groove 132. It may be provided with a tapered portion (142b) that pushes outward. That is, the tapered portion 142b may be a point where the diameter gradually increases from the upper end of the upper body 142, and the head 142c may be a point where the maximum increased diameter is maintained.

At this time, the outer diameter of the expanded portion 123 of the abutment 120 may be expanded by a certain ratio or more. It is difficult to expand the outer diameter at a large rate due to the nature of the material, and even if it is expanded within a certain ratio, sufficient fixing force can be provided when the coupling protrusion 122b is inserted into the coupling groove 132.

At this time, the protruding length of the coupling confirmation protrusion 142a of the screw 140 may be formed to be smaller than the protruding length of the coupling protrusion 122b of the abutment 120. That is, the coupling confirmation protrusion 142a can be used to provide a feeling of coupling rather than the coupling protrusion 122b.

At this time, the coupling protrusion 122b may be seated in the coupling groove 132 of the crown 130 by fastening the screw 140.

At this time, a plurality of the coupling confirmation protrusions 142a and the coupling confirmation grooves 122c may be formed. Here, only the coupling confirmation protrusion 142a and the groove 122c are formed one by one, but of course, a plurality of them may be formed. For example, if two screws are formed, the operator can know that the fastening of the screw 140 is completed at the first screw 140 and stop at the second screw.

At this time, referring to FIG. 2A, when the upper end of the head 142c of the screw 140 is inserted into the coupling groove 122c of the crown 130, the screw 140 is fastened in place and the projection for confirmation of coupling is formed. (142a) may be inserted into the coupling confirmation groove portion 122c. Here, the screw 140 is fixed almost at the same time as the screw 140 is inserted into the crown 130, thereby giving an angle to the tool 20 inserted toward the head 142c of the screw 140 as shown in FIG. 8. This allows the operator to expand the degree of freedom in using tools, thereby improving the convenience of the procedure and making it possible to perform the procedure in locations that were previously not possible. Therefore, after fastening the screw 140 to the correct position, the top of the head 142c of the screw 140 is located at the height of the coupling groove 132 of the crown 130 to provide an insertion angle of the tool 20. You can.

Figure 2b shows another embodiment of the present invention, in which a groove 142a' for confirmation of coupling is located on the screw 140, and a protrusion 122c' for confirmation of coupling is located on the abutment 120, and Figure 2c shows another embodiment of the present invention. As an example, this is an embodiment in which a plurality of projections 142a" for confirmation of engagement and grooves 122c" for confirmation of engagement are located. At this time, for flexible entry of the engagement confirmation protrusion 142a", the plurality of engagement confirmation grooves 122c" may have different heights (h) or depths (C).

In another embodiment, referring to FIG. 2C, when a plurality of coupling confirmation grooves 122c" are located in the screw insertion direction (longitudinal direction), the height (h ₂ ) of the lower groove is equal to the height of the upper groove (h ₁₎ ). The corresponding protrusion may also be designed accordingly. In another embodiment, the depth (C) of the lower groove may be shorter than the depth (C) of the upper groove.

At this time, the height of the groove (h) refers to the longitudinal width of the groove, and the area near the height of the joining groove refers to the length of the width above (tool fastening direction) and below (screw insertion direction) the longitudinal width. A branch refers to the entire section. That is, referring to FIG. 11, when the width value is Z, the total length of the coupling groove height including the vicinity is equal to 3Z. This indicates the minimum and maximum lengths at which the screw can be inserted depending on the shape of the top of the screw due to product diversification, the operator's proficiency, and the condition of the teeth.

At this time, the height of the coupling groove may be indicated as H, and the height of the coupling confirmation groove may be indicated as h.

Additionally, when the screw 140 is inserted and the coupling protrusion 122b is inserted into the coupling groove 132, the coupling confirmation protrusion 142a may also be inserted into the coupling confirmation groove 122c. Therefore, the feeling of coupling between the screw 140 and the abutment 120 and the feeling of coupling between the screw 140 and the crown 130 can be felt simultaneously or double, and this means that even if there are individual differences in the operator, the minimum and maximum lengths described above You can feel a strong sense of unity within.

At this time, when the screw 140 is fastened to the correct position, the screw 140 rotates in reverse until an external force is applied to remove the engagement confirmation protrusion 142a from the inserted state in the engagement confirmation groove 122c. This can be prevented. That is, after the screw 140 is fastened to the correct position, reverse rotation of the screw 140 is prevented unless a tolerable external force is applied, thereby preventing an accident in which the crown 130 is separated.

Referring to FIG. 2A, a cross-sectional view is shown before and after fastening the screw 140 of the cementless abutment assembly 100 according to an embodiment of the present invention. In Figure 2a, (a) shows a state in which fastening has begun, and (b) shows a state in which fastening is completed. The fixture 110 is installed in the alveolar bone. Instead of performing the abutment 120 and crown 130 immediately after installing the fixture 110 in the alveolar bone, after the fixture 110 procedure, wait a certain period of time and after the area around the procedure is healed and organized, the upper prosthesis, the crown ( 130) will be performed. The crown 130 may be fixed to the fixture 110 via the abutment 120, which is an abutment. The procedure involves assembling the crown 130 on the top of the abutment 120 with the abutment 120 inserted into the central hole 111 of the fixture 110, and then inserting the screw 140 into the crown 130. ) and the through holes 120a and 131 of the abutment 120 and then fastened to the internal screw 111a of the fixture 110.

This appearance is shown in (a). At this time, the abutment 120 is inserted to a position where it can be maximally inserted into the interior of the fixture 110 by the tapered portion 121a of the lower body 121. The crown 130 may be assembled so that its lower end passes through the coupling protrusion 122b of the abutment 120 and is supported in close contact with the flange portion 121b. At this time, the coupling protrusion 122b of the abutment 120 is located at the same height in the coupling groove 132 of the crown 130, and a part of the coupling protrusion 122b is in the coupling groove 132. can be inserted. At this time, as the screw 140 begins to be fastened, the tapered portion 142b of the screw 140 may be located at the upper end of the abutment 120. The engagement confirmation protrusion 142a is spaced apart from the engagement confirmation groove 122c.

At this time, if the screw 140 is further rotated and tightened in the state as in (a), the tightening is completed in the state as in (b). When the screw 140 is continuously rotated in the fastening direction, the screw 140 is fastened and the screw head 142c is inserted so that the tapered portion 142b spreads the expanded portion 123 of the abutment 120 outward. . Accordingly, the coupling protrusion 122b is completely inserted into the coupling groove 122c, and the insertion of the coupling confirmation protrusion 142a is completed while being positioned at the height of the coupling confirmation groove 122c. Of course, at this time, the operator feels that the fastening has been completed through the sense of connection, that is, through sensory perception of sense organs such as hearing or touch. At this time, the feeling of coupling is a feeling of coupling generated when the coupling protrusion 122b of the abutment 120 is closely inserted into the coupling groove 132 of the crown 130 and the coupling of the screw 140 or the abutment 120. It is a feeling of defect that occurs when the confirmation protrusion is inserted into the screw or abutment 120's connection confirmation groove, and is conveyed to the operator to inform him or her that the fixation has been achieved.

In another embodiment, the abutment 120 includes a screw portion 321 that can be inserted into the central hole 311 of the fixture 310 and has an expansion portion 351, referring to FIG. 5B. It may be a split-type cementless abutment assembly (320, 350) including a cap (350) and a cap corresponding portion (320) having a multi-directional protrusion. The lower inner side of the abutment cap 350 has a fastening portion that is fastened to the polygonal protrusion 322 of the cap corresponding portion 320, and the cap 350 is divided into a plurality of pieces so that they can be opened outward around the central axis. An expanded portion 351 is formed, and an end of the expanded portion 351 may be provided with a coupling protrusion 351a protruding outward.

In the cementless abutment assembly, the insertion angle of the tool is possible because the length at which the screw is inserted for fastening is shorter than the maximum outer diameter of the abutment (distance between the extreme ends of the coupling protrusions), and the abutment If it is a cylindrical type as shown in Figures 2a to 2c, the distance between the extreme ends of the coupling protrusions may be equal to or longer than the average diameter of the When taking the cap type as shown, the distance between the extreme ends of the coupling protrusions may be equal to or shorter than the x-axis average diameter of the expanded part of the abutment.

Referring to Figure 3, an exploded view of the cementless abutment assembly 100 according to an embodiment of the present invention is shown. With the fixture 110 installed in the alveolar bone, the abutment 120, crown 130, and screw 140 may be assembled in order.

Referring to FIGS. 4A and 4B, a plan view of an abutment 120, which is a component of the cementless abutment assembly 100 according to an embodiment of the present invention, is shown. The expanded portion 123 of the upper body 122 of the abutment 120 is divided into four or six cut portions 122a and 122a', and some of them have longitudinal cutouts. A cut portion 122d is formed along. The crown 130 can be more easily inserted along the outer surface of the abutment 120 by this cut portion 122d.

Referring to Figure 5A, a cross-sectional exploded view of a cementless abutment assembly according to an embodiment of the present invention is shown. The abutment 120 is inserted into the central hole 111 of the fixture 110, and the tapered portion 121a of the abutment 120 is in close contact with the top of the fixture 110 and is inserted to a position where it can no longer be inserted. It can be. The crown 130 is inserted into the outside of the upper body 122 of the abutment 120, and can be inserted up to the height at which the coupling protrusion 122b is located in the coupling groove 132. In this state, when the screw 140 passes through the through holes 131 and 120a of the crown 130 and the abutment 120 and is screwed with the internal screw 111a of the fixture 110, fastening is achieved. Accordingly, the coupling protrusion 122b of the abutment 120 is inserted into the coupling groove 132 of the crown 130 to fix the crown 130, and the coupling confirmation protrusion 142a of the screw 140 is also inserted into the coupling groove 132 of the crown 130. As it is coupled to the coupling confirmation groove 122c of the abutment 120, a feeling of coupling is provided to the operator. Additionally, the locking jaw 140a of the screw 140 is caught by the locking jaw 112 of the fixture 110 and can no longer be fastened, and the fixation of the crown 130 is completed. Referring to Figure 5b, it is shown applied to a split type abutment. The abutment is a type that is divided into a cap 350 and a cap corresponding part 320, and the cap corresponding part 320 is coupled to the fixture 310 with a screw 321 and assembled, and the cap 350 and the upper part are attached. It is assembled by fastening the screws 340 while the crown 330 is covered. At this time, a protrusion 342 for confirmation of engagement may be formed on the screw 340, and a groove for confirmation of engagement corresponding thereto may be formed inside the cap counterpart 320. In this way, it can be seen that it can be applied to the split type where the abutment is divided.

Referring to FIG. 6, an operational diagram of the expanded portion 123 of the abutment 120, which is a component of the cementless abutment assembly according to an embodiment of the present invention, is shown. The coupling protrusion 122b of the abutment 120 expands and opens as the screw 140 is inserted and is inserted into the coupling groove 132 of the crown 130. At this time, the angle at which the expansion portion 123 is opened may be 0 to 5 degrees as described above. Of course, when the expansion portion 123 is opened and fastened, the practitioner will be able to feel a sense of connection.

Referring to FIG. 7, a partial cross-sectional view of an abutment 120, which is a component of a cementless abutment assembly according to an embodiment of the present invention, is shown. A cut portion 122a is formed to form the expanded portion 123 of the abutment 120, and a groove portion 122c for confirming engagement is formed in the lower part of the cut portion 122a. At this time, the coupling confirmation groove 122c may be formed in the area where the incision 122a is located, which can give the operator a greater sense of safety than if it is located below the incision. Here, the cross section of the coupling confirmation groove 122c is formed in an arc shape, but of course, it is not limited to this shape. It may be formed in a step shape rather than an arc shape, and the length of the groove may also be formed longer. At this time, if the cross section of the coupling confirmation groove 122c is formed in a step shape rather than an arc shape, the screw 140 will hardly be able to come off, and ultimately, complete reverse rotation can be prevented.

Referring to FIG. 8, a cross-sectional view of the tool 20 of the cementless abutment assembly according to an embodiment of the present invention at an angle is shown. Unlike the prior art in FIG. 1, the tool 20 for rotating the screw 140 is tilted sufficiently to enable the procedure, and in this state, the screw 140 is fully fastened, that is, locked. It is a state. At this time, the reason why a sufficient insertion angle can be provided to the tool 20 is that when the upper end of the head 142c of the screw 140 is inserted into the coupling groove 132 of the crown 130, the screw 140 ) is fastened in place so that the engagement confirmation protrusion 142a is inserted into the engagement confirmation groove 122c, and after the screw 140 is fastened in place, the top of the head 142c of the screw 140 is This is because it is located at the height of the coupling groove 132 of the crown 130. Conversely, if there is a reason to separate the crown 130, the tool 20 may be inserted and rotated at an angle desired by the operator.

9 and 10, front views are shown showing various embodiments of the screw 140, which is a component of the present invention. In the case of (a) in FIG. 9, the protrusion confirmation portion 342a, which is a protruding portion, may have various shapes and quantities, such as annular and polygonal. Additionally, the groove portion 122c for confirmation of engagement may be formed in larger numbers than the protrusion portion 143 for confirmation of engagement, and may have an inclination. When the coupling confirmation groove 122c has an inclination, the coupling confirmation protrusion 143 is fastened to the coupling confirmation groove 122c, and as it passes by, the operator realizes that the fastening of the screw 140 is completed in the first place. It is possible to feel a complete connection and stop at the next engagement confirmation groove 122c, which does not have an inclination. In case (b), there is one or two coupling confirmation protrusions 442a. Additionally, Figure 10 shows that the coupling confirmation protrusion 242a is in the shape of a sea ring. Therefore, the number and shape of these coupling confirmation protrusions can be varied in various ways depending on the design. Despite these various modifications, the protrusion for confirming the combination is inserted into the groove for confirming the combination, and of course provides the operator with a feeling of proper connection.

Although the embodiments of the present invention have been described, the spirit of the present invention is not limited to the embodiments presented in this specification, and those skilled in the art who understand the spirit of the present invention can add or change components within the scope of the same spirit. , deletion, addition, etc., other embodiments can be easily proposed, but this will also be said to fall within the scope of the present invention.

100: Cementless abutment assembly
110: Fixture 111: Central hole
111a, 111b: Screw 112: Locking jaw
120: Abutment 120a: Through hole
121: lower body 121a: tapered portion
121b: Flange portion 122: Upper body
122a: cutout 122b: coupling protrusion
122c: Groove for checking coupling 123: Expansion part
130: crown 131: through hole
132: coupling groove 140: screw
140a: Locking jaw 141: Lower body
141a: Screw 142: Upper body
142a: Protrusion for checking coupling 142b: Tapered portion
142c: head

Claims (19)

A fixture installed in the alveolar bone;
An abutment that is inserted and fixed into the central hole of the fixture, has an expansion portion divided into a plurality of parts so that the upper end can be opened outward about a central axis, and has a coupling protrusion at an end of the expansion portion that protrudes outward. ;
A crown having a coupling groove into which the coupling protrusion is inserted when the expanded portion of the abutment opens outward; and
A screw that penetrates the crown and the abutment and is fastened to the fixture by expanding the expansion portion so that the coupling protrusion is inserted into the coupling groove, thereby fixing the crown and the abutment to the fixture;
A protrusion or groove for checking engagement is formed on one side of the screw, and a groove or protrusion for checking engagement corresponding to the protrusion or groove for checking engagement is formed on the abutment,
When the screw is inserted and the engagement confirmation protrusion is inserted into the engagement confirmation groove, a feeling of engagement is transmitted through the tool,
When the screw is fastened to the correct position, the screw is prevented from rotating in reverse until an external force is applied to cause the engagement confirmation protrusion to separate from the state in which it is inserted into the engagement confirmation groove,
The cementless abutment assembly provides a greater sense of coupling as the coupling confirmation protrusion or groove is located closer to the top of the abutment than when located at the bottom of the expanded part under the same conditions. delete delete delete According to claim 1,
A cementless abutment assembly in which a plurality of the coupling confirmation protrusions and the coupling confirmation grooves are formed. According to clause 5,
The plurality of coupling confirmation protrusions and coupling confirmation grooves are such that the height (h ₂ ) of the coupling confirmation protrusions and coupling confirmation grooves located at the bottom is equal to the height (h ₁ ) of the coupling confirmation protrusions and coupling confirmation grooves located at the top. ) value greater than the cementless abutment assembly. According to clause 5,
A cementless abutment assembly wherein the plurality of grooves have different depths (C). According to claim 1,
A cement-free abutment assembly in which the screw is fastened in place by inserting the engagement confirmation protrusion into the engagement confirmation groove. According to clause 8,
When the screw is inserted and the coupling protrusion is closely inserted into the coupling groove, the coupling confirmation protrusion is also inserted into the coupling confirmation groove. According to claim 1,
A cementless abutment assembly in which the angle at which the expanded portion of the abutment opens is 0 to 5 degrees. According to claim 1,
A cementless abutment assembly in which the depth of the groove for checking the combination of the abutment is 1-8% of the maximum outer diameter of the abutment. According to claim 1,
A cementless abutment assembly wherein the lower inner diameter of the through hole of the crown is formed to be smaller than the upper outer diameter of the abutment. According to claim 12,
When the crown is inserted into the outer surface of the abutment, the diameter of the expanded portion is reduced, and when the coupling protrusion reaches the coupling groove, the diameter of the expanded portion is restored. A cementless abutment assembly. A fixture installed in the alveolar bone;
An abutment that is inserted and fixed into the central hole of the fixture, has an expansion portion divided into a plurality of parts so that the upper end can be opened outward about a central axis, and has a coupling protrusion at an end of the expansion portion that protrudes outward. ;
A crown having a coupling groove into which the coupling protrusion is inserted when the expanded portion of the abutment opens outward; and
A screw that penetrates the crown and the abutment and is fastened to the fixture while expanding the expansion portion so that the coupling protrusion is inserted into the coupling groove, thereby fixing the crown and the abutment to the fixture;
A cementless abutment assembly in which the protrusion length of the protrusion for checking the coupling of the screw is formed to be smaller than the protrusion length of the protrusion for coupling the abutment. The method of claim 1 or 14,
A cementless abutment assembly wherein the protrusion for confirming the connection is in the form of a sea ring. The method of claim 1 or 14,
The abutment has an abutment cap corresponding portion having a multi-angled protrusion with a direction, a fastening portion that is fastened to the polygonal protrusion, and an abutment cap having a coupling protrusion with an end of the expanded portion protruding outward. A cementless abutment assembly assembled with. The method of claim 1 or 14,
A cementless abutment assembly wherein the length at which the screw is inserted for in-position fastening is shorter than the distance between the extreme ends of the coupling protrusions. According to claim 17,
A cementless abutment assembly wherein the distance between the extreme ends of the coupling protrusions is equal to or longer than the average diameter of the abutment expansion portion. According to claim 17,
A cementless abutment assembly wherein the distance between the extreme ends of the coupling protrusions is equal to or shorter than the average diameter of the abutment.

Images