KR20240101044A - Screw for dental implant and dental implant structure containing the same - Google Patents

Abstract

A screw for a dental implant and a dental implant structure including the same are disclosed. The screw for dental implant according to the present invention is for fixing the abutment to the implant body installed in the alveolar bone, and has a lower wedge portion with a structure whose diameter increases downward, and a lower wedge portion with a diameter equal to the minimum diameter of the lower wedge portion. It is composed of a body part with a round bar structure that extends at a certain height from the top of the wedge part, a screw part that extends at a certain height from the top of the body part with a round bar structure and has male threads formed on the outer surface, and a dedicated tool at the top of the screw part or the upper area of the screw part. It is characterized by including a tool fastening part that is fastened.

Description

Screw for dental implant and dental implant structure including the same {SCREW FOR DENTAL IMPLANT AND DENTAL IMPLANT STRUCTURE CONTAINING THE SAME}

The present invention relates to a screw for a dental implant, and particularly to a screw for a dental implant that secures an abutment to an implant body installed in the alveolar bone, and a dental implant structure including the same.

An implant refers to a replacement that restores human tissue when it is lost, but in dentistry, it refers to an artificially created tooth. This implant treatment method is widely used as an alternative treatment method that can restore and reconstruct the original function of one's own teeth when teeth are lost or tooth function deteriorates.

Dental implants can be roughly divided into external connection methods and internal connection methods depending on the form in which the implant body and abutment, which are installed in the alveolar bone, are combined.

Among them, the external connection method has the advantage that the implant body inserted into the bone is relatively sturdy, but the gap between the implant body platform and the abutment is large in the early stages after placement, so there is a high probability of bacteria colonizing, leading to bone resorption at the border. There is a downside to this happening.

On the other hand, the internal connection method forms a regular hexagonal groove (commonly referred to as a hexagon) inside the implant body, and forms the part where the abutment meets the implant body in the shape of a truncated cone to exclude space for bacteria to inhabit, thus forming the initial bone. Absorption can be minimized. Therefore, it has the advantage of having a high implantation success rate, and for this reason, the internal connection method has been mainly used recently.

Figure 1 is a diagram showing an example of an internal connection method among the connection methods between an implant body and an abutment. The internal connection method is an abutment in a regular hexagonal groove (symbol omitted) inside the implant body 10 installed in the alveolar bone. With a portion of (30, Abutment) inserted, the screw 20 is inserted into the abutment 30 and screwed to the inner main surface of the implant body 10 to fix the abutment 30 in the middle. It's a method.

In FIG. 1, reference numeral 40 indicates a prosthesis 40 coupled to the abutment 30.

However, in the internal connection method as shown in Figure 1, a space for screw fastening between the screw and the implant body (space where the female thread is formed) must be formed inside the implant body, so that the abutment can directly contact the implant body. Because the space is inevitably reduced, there is a structural problem in that it is difficult to secure a sufficient height of the contact area ('h' in Figure 1) where the implant body and the abutment are in direct contact.

Moreover, the internal connection method as shown in Figure 1, in which the screw is directly screwed into the implant body and the abutment is fixed in the middle, has a disadvantage in terms of durability because the thread is machined on the inside of the implant body for fastening with the screw. . Specifically, the threaded part formed inside the implant body is structurally weaker than other parts, so there is a problem that fatigue failure occurs in that part over time.

Korean Patent Publication No. 10-2009-0077982 (publication date 2009.07.16) Korean Patent No. 10-2304081 (registration date 2021.09.14)

The technical problem to be solved by the present invention is to increase the height of the contact area where the abutment directly contacts the implant body by being coupled to the implant body using an anchor bolt method, and to increase the height of the contact area where the abutment is in direct contact with the implant body, and to reduce the inner surface of the implant body, which is considered the main cause of fatigue failure. The object is to provide a screw for dental implants with a structure that can omit the screw thread.

Another technical problem to be solved by the present invention is to provide a dental implant structure that has a higher static load strength and fatigue failure limit while resolving the disadvantages of the conventional internal connection method, and has a structure suitable for short implants. will be.

According to one embodiment as a means of solving the problem, a screw for a dental implant that secures an abutment to an implant body installed in the alveolar bone includes a lower wedge portion whose diameter or cross-sectional area increases as at least a portion goes downward; , a body part of a round bar structure extending at a certain height from the top of the lower wedge part, a screw part extending at a certain height from the top of the body part of the round bar structure and having a male thread formed on the outer surface, and a body part formed at the top of the screw part or in the upper area of the screw part. It is possible to provide a screw for a dental implant that includes a tool fastening portion to which a dedicated tool is fastened.

In one embodiment, the lower wedge portion may include a first region whose diameter or cross-sectional area gradually increases downward. At this time, the first area may be formed with a surface inclination angle of 3 to 8 degrees, and the cross-sectional shape of the first area is circular or a spline shape with at least two grooves at equal or unequal intervals in the circumferential direction. It may be formed in a Torx shape. In one embodiment, the lower wedge may further include a second region formed at a predetermined height below the first region. At this time, the second region is formed to have the same diameter as the maximum diameter of the first region, or the upper end of the second region is formed to have the same diameter as the maximum diameter of the first region and the diameter gradually decreases downward. It can be.

In one embodiment, the lower wedge portion may be formed in a sphere shape.

The screw for dental implant according to one embodiment may also be formed so that the lower wedge portion has a rough surface, and the height (h1) of the screw portion is 1/2 to 1/2 of the height (h2) of the body portion. Could be 4/5.

In the screw for dental implant according to one embodiment, the tool fastening portion may be formed in the form of a polygonal bolt head protruding upward from the top of the threaded portion, or may be formed in the form of a socket or groove engraved in the direction of the threaded portion.

Here, when the tool fastening part is formed in the form of a polygonal bolt head, the tool fastening part may be formed in the shape of any one of rectangular, square, hexagonal, and octagonal bolt heads in planar shape, and the tool fastening part is engraved in the direction of the thread part. When it is in the form of a socket or groove, the tool fastening part may be formed in any one of the shapes of -, +, and polygonal grooves.

According to another embodiment as a means of solving the problem, an abutment is provided with a binding pipe portion elastically deformed radially outward in the lower region, and an abutment is concentrically disposed on the inside of the abutment and screwed inside the abutment. , Corresponding to the binding pipe portion and the wedge portion in the lower area of the internal groove where the screw and the abutment according to the above-described embodiment are provided with a lower wedge portion whose diameter or cross-sectional area gradually increases downward. It is possible to provide a dental implant structure that includes an implant body on which a binding portion is formed, and wherein the binding tube portion is supported toward the binding portion as the screw rotates.

In another embodiment of this configuration, as the screw rises, the lower wedge portion expands the binding tube portion of the lower part of the abutment to strongly adhere to the implant body, thereby realizing a strong binding between the abutment and the implant body.

Specifically, a screw is inserted from below the abutment so that the binding pipe portion surrounds at least a portion of the wedge portion and is screwed inside the abutment, and the screw is screwed inside the abutment. The binding pipe portion surrounding at least a portion of the wedge portion is inserted into the binding portion of the internal groove, and when the screw is rotated in one direction while the binding pipe portion is inserted into the binding portion, the wedge portion of the screw rises. By opening the binding tube outward in the radial direction, a strong binding between the implant body and the abutment can be realized.

According to the screw for dental implant according to an embodiment of the present invention, the anchor bolt structure has a wedge portion at the bottom and a thread is formed in the middle, and is coupled to the implant body using an anchor bolt method, so that the abutment and the implant body directly contact each other. The height of the contact area can be increased, and thus a more stable and solid bond can be achieved between the abutment and the implant body.

In addition, the unique coupling (anchor bolt coupling) method that screws into the abutment and secures the abutment to the implant body makes it possible to omit the screw threads on the inside of the implant body, which are considered the main cause of fatigue failure. When applying a screw according to an embodiment of the present invention, durability is further improved and a highly reliable implant structure can be provided.

Figure 1 is a diagram showing an example of a conventional internal connection method among connection methods between an implant body and an abutment.
Figure 2 is a perspective view of a screw for dental implant according to an embodiment of the present invention.
Figure 3 is a front view of the screw shown in Figure 2.
FIG. 4 is an enlarged view of the lower wedge portion shown in FIG. 3.
Figure 5 is a diagram showing a preferred modified example of the lower wedge portion.
FIG. 6 is a view showing a preferred modified example of the cross-sectional shape of the lower wedge portion.
Figure 7 is a diagram showing another preferred modification of the lower wedge portion.
Figures 8 and 9 are views showing various embodiments of the tool fastening part included in the screw.
Figure 10 is an exploded perspective view showing a dental implant structure including an abutment for a dental implant according to an embodiment of the present invention.
Figure 11 is a partially exploded perspective view showing the abutment and screw in Figure 10 being coupled to the implant body in a mutually coupled state.
FIG. 12 is a longitudinal cross-sectional view showing a longitudinal (vertical or height) cross-section of the dental implant structure shown in FIG. 10 in a fully coupled state.
Figure 13 (a) is an enlarged view of the main part of the present invention showing the 'A' portion in the combined cross-sectional view of Figure 12, and Figure 13 (b) is another preferred embodiment of the binding pipe portion and binding portion shown in (a). Drawing showing an example.
Figure 14 is a front view of the abutment shown in Figures 10 to 12
Figure 15 is a cutaway perspective view of the abutment shown in Figure 14.
Figure 16 is an enlarged view of the binding pipe shown in Figure 15.
17 is a front view of an implant body applied to a dental implant structure according to an embodiment of the present invention.
Figure 18 is a cutaway perspective view of the implant body shown in Figure 17.
Figure 19 is a view showing various embodiments of the shape of the binding portion formed at the lower end of the abutment and the binding portion formed inside the implant body.
Figure 20 is a diagram illustrating a process of fastening a dental implant structure according to an embodiment of the present invention.
Figure 21 is a cross-sectional view comparing the present invention with a representative example of a conventional internal connection method among various methods of connecting the implant body and the abutment.

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

The terms used in the specification are merely used to describe specific embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

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

Additionally, terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “…unit,” “…unit,” and “…module” used in the specification refer to a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. You can.

In the description with reference to the accompanying drawings, identical components will be assigned the same drawing reference numerals, and overlapping descriptions thereof will be omitted. Also, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Figure 2 is a perspective view of a screw for dental implant according to an embodiment of the present invention, and Figure 3 is a front view of the screw shown in Figure 2. And FIG. 4 is an enlarged view of the wedge portion of FIG. 3.

2 to 4, the screw 200 for dental implant according to an embodiment of the present invention is a medium for fixing the abutment to the implant body installed in the alveolar bone, and has a lower wedge part (230) Includes. The lower wedge portion 230 may have a structure in which the diameter or cross-sectional area of the lower wedge portion 230 increases as at least a portion goes downward, as shown in the example in the drawing, and the body portion 220 of a round bar structure with a circular cross-section is positioned at the upper end of the lower wedge portion 230. can be formed integrally.

The body portion 220 may extend at an arbitrary or certain height from the top of the lower wedge portion 230, which has a structure in which the diameter or cross-sectional area increases as the diameter or cross-sectional area increases downward, and has a screw portion having male threads machined on the outer surface ( 260) may be formed to extend from the top of the body portion 220 of the round bar structure at a random or certain height.

Here, the body portion 220 has the same diameter as the minimum diameter (D1, the top diameter of the lower wedge portion) of the lower wedge portion 230 and may be formed at an arbitrary or certain height from the top of the lower wedge portion 230.

As shown in the drawing, the lower wedge portion 230 includes a first region 232 whose diameter or cross-sectional area gradually increases downward, and a second region 232 formed at a predetermined height below the first region 232. It may be a configuration including a region 234. Of course, if necessary, the second region 234 may be deleted and the lower wedge portion 230 may be formed solely of the first region 232 whose diameter or cross-sectional area gradually increases downward.

When the lower wedge portion 230 is composed of a first region 232 whose diameter or cross-sectional area gradually increases downward and a second region 234 formed below the first region 232, the Area 2 234 has a diameter equal to the maximum diameter (D2, the lowest diameter of the first area) of the first area 232 and extends downward from the bottom of the first area 232 for a predetermined length. It may be a configuration.

In some cases, as shown in FIG. 5 showing a preferred modified example of the lower wedge portion 230, the upper end of the second region 234 has the maximum diameter (D2, first region) of the first region 232. It may be formed to have the same diameter as the lowermost diameter of , and the diameter (diameter of the second region) gradually decreases as it goes downward.

In this case, the inclination angle (surface inclination angle of the first area) of the first area 232 is preferably 3 to 8 degrees, but depending on the product specifications, material, or shape of the first area, the angle (surface inclination angle of the first area) may vary. Since it is changeable, it should be noted that it is not limited to 3 to 8 degrees.

The first region 232 of the lower wedge portion 230 may have a truncated cone shape with a circular cross-sectional shape. Additionally, the second region 234 may be a cylinder with a circular cross-sectional shape or an inverted truncated cone shape (if the diameter of the second region gradually decreases downward). Of course, the cross-sectional shape of the first area 232 is not limited to circular.

As shown in FIG. 6 showing a preferred modification of the cross-sectional shape of the first area 232, the cross-sectional shape of the first area 232 has at least two grooves at equal or unequal intervals in the circumferential direction. It can be changed into various shapes, such as a spline shape or a Torx shape, and the cross-sectional shape does not matter much as long as the diameter or cross-sectional area gradually increases downward.

FIG. 7 is a side view showing another preferred modified example of the lower wedge portion. The lower wedge portion 230' is a structure similar to the example in the drawing (FIG. 7) that satisfies the condition that the diameter or cross-sectional area gradually increases as at least a portion goes downward. It may be formed into a (Sphere) shape.

This lower wedge portion 230 may be surface treated to have a rough surface to increase contact friction when in contact with the inner main surface of the binding pipe portion of the abutment, which will be described later, and the screw portion with male threads formed on the outer surface. The height (h1) of (260) is preferably 1/2 to 4/5 of the height (h2) of the body portion 220, and the male thread has a single or double thread structure with the same pitch based on the screw height direction in the drawing. It can be.

The tool fastening part 210 may be formed integrally at the top of the threaded part 260 or in the upper area of the screwed part. The tool fastening portion 210 provides a fastening surface to which a dedicated tool for implant surgery, such as a driver or torque wrench, is fastened. This tool fastening portion 210 may be formed in the form of a polygonal bolt head protruding upward from the top of the threaded portion 260, or may be formed in the form of a socket or groove engraved in the direction of the threaded portion 260.

FIGS. 8 and 9 are diagrams showing various embodiments of the tool fastening portion. When the tool fastening portion is formed in the form of a polygonal bolt head, the tool fastening portion 210 has a rectangular or square planar shape, as shown in FIG. 8. , hexagonal, or octagonal. It can be formed in the shape of any one of the bolt heads, and when engraved in the direction of the threaded part 260, the tool fastening part 210' has any of -, +, and polygonal grooves as shown in FIG. 9. It can be configured in one form.

The screw for dental implant according to an embodiment of the present invention has an anchor bolt structure with a wedge portion at the bottom and a thread formed in the middle, and is coupled to the implant body using an anchor bolt method so that the abutment directly contacts the implant body. It is a structure that can increase the height of the contact area, and has the advantage of being able to omit the threads on the inside of the implant body, which are considered the main cause of fatigue failure.

Hereinafter, we will look at a dental implant structure including a screw for dental implant according to an embodiment of the present invention described above. Here, for convenience of explanation, the same drawing reference numerals will be given to the same configurations as those in the previously attached drawings, and descriptions of overlapping specific configurations will be omitted.

Figure 10 is an exploded perspective view showing a dental implant structure including an abutment for a dental implant according to an embodiment of the present invention, and Figure 11 shows the implant body in a state in which the abutment and the screw are coupled to each other in Figure 7. This is a partially exploded perspective view showing how it is connected. And FIG. 12 is a longitudinal cross-sectional view showing a longitudinal (vertical or height) cross-section of the dental implant structure shown in FIG. 10 in a fully coupled state.

Referring to Figures 10 to 12, the abutment (300) may be provided at the lower end with a binding pipe portion 330 that is deformable radially outward, preferably elastically expandable radially outward, and includes a screw ( Screw, 200 is concentrically disposed on the inside of the abutment 300 and screwed inside the abutment 300, and the lower part of the screw 200 corresponding to the position of the binding pipe portion 330 moves downward. The above-described lower wedge portion 230 may be formed with an increased diameter or cross-sectional area.

As the screw 200 is screwed together inside the abutment 300 in a state where the screw 200 is concentrically disposed on the inside of the abutment 300, a dedicated tool such as a driver or torque wrench is used. When the screw 200 is coupled to the tool fastening portion 210 and rotated in one direction (the direction that raises the screw) with respect to the abutment 300, the screw 200 rises and the lower wedge portion 230 It is pushed inside the binding pipe part 330 to expand the binding pipe part 330.

An internal groove 120 may be formed in the implant body 100 into which a portion of the abutment 300 is inserted and fixed. The inner groove 120 may have a binding portion 124 at its lower end corresponding to the binding pipe portion 330 and the lower wedge portion 230. Screw threads 110 for alveolar bone implantation may be formed on the outer surface of the implant body 100, and the threads 110 may have a single or double thread structure with the same or different pitch.

According to this configuration, when the screw 200 screwed on the inside of the abutment 300 is rotated in one direction using a dedicated tool, the wedge portion 230 is pushed into the binding pipe portion 330 and By extending the binding pipe portion 330 in the radial direction or supporting the binding pipe portion 330 toward the binding portion 124, the binding pipe portion 330 can be fixed in strong contact with the binding portion 124. , As a result, a firm bond between the abutment 300 and the implant body 100 can be implemented.

The screw 200 is inserted from the bottom of the abutment 300 so that the binding pipe portion 330 surrounds at least a portion of the lower wedge portion 230 of the screw 200. The screw 200 may be screwed on the inside (see FIG. 11), and in this state, the screw 200 and the abutment 300 are coupled to each other, and the binding tube 330 is attached to the implant body 100. The abutment 300 may be coupled to the implant body 100 so that the binding portion 124 is positioned.

Figure 13 (a) is an enlarged view of the main part of the present invention, showing the 'A' portion in the combined cross-sectional view of Figure 12, and Figure 13 (b) is another preferred embodiment of the binding pipe portion and binding portion shown in (a). This is a drawing showing an example.

As shown in FIG. 13, the inner main surface of the binding pipe portion 330 has a tapered structure, that is, an inclined structure, corresponding to the shape of the wedge portion 230 (a tapered shape with the inner diameter gradually increasing downward). It can be formed into a structure. At this time, the surface inclination angle (β) of the corresponding inner main surface of the binding pipe portion 330 and the lower wedge portion 230 is preferably 3 to 8 degrees.

The surface of the binding pipe part 330 and the surface of the binding part 124 in contact with it may be roughened. In this case, when the binding tube portion 330, which is opened by the lower wedge portion 230, is brought into close contact with the surface of the binding portion 124, the frictional force that suppresses their relative movements increases, so that the implant body 100 and the abutment 300 ) A more robust bond between the implants can be realized, and rotational slip of the abutment 300 with respect to the implant body 100 can be prevented.

In some cases, a locking protrusion 336 may be formed to protrude along the lower circumferential surface of the binding pipe portion 330. And at the bottom of the binding portion 124, a locking groove 126 may be formed in an undercut structure corresponding to the locking protrusion 336 (see (b) of FIG. 13). In this case, as the binding tube portion 330 opens and the locking protrusion 336 engages with the locking groove 126, a more solid bond between the implant body 100 and the abutment 300 can be implemented.

FIGS. 14 and 15 are views of an abutment applied to a dental implant structure according to this embodiment. FIG. 14 is a front view of the abutment, and FIG. 15 is a cutaway view of the abutment shown in FIG. 14. It is a perspective view.

Referring to Figures 14 and 15, the abutment 300 serves to support the prosthesis by combining with the implant body 100 installed in the alveolar bone, and includes an upper prosthesis coupling portion 310 coupled to the prosthesis, and , part or all of which may include a lower body coupling portion 320 coupled to the implant body 100 in an internal connection manner.

The prosthesis coupled to the upper prosthesis coupling portion 310 may be, for example, a crown, and is positioned between the upper prosthesis coupling portion 310 and the lower body coupling portion 320 so as to contact the gingiva without being coupled to the implant body 100. A bulge 315 may be formed that protrudes more convexly in the radial direction compared to other parts (upper prosthetic part coupling part and lower body coupling part).

The lower region of the lower body coupling portion 320 may be integrally provided with a binding pipe portion 330 capable of elastically deforming outwardly in the radial direction, and penetrates the upper prosthesis coupling portion 310 and the lower body coupling portion 320. To this end, the inside of the abutment 300 may be provided with a continuous hole 335 along the center of the longitudinal direction (height direction in the drawing).

The hole 335 may include a tool entry hole 350 formed inside the prosthesis coupling portion 310 and a screw through hole 340 formed inside the lower body coupling portion 320. And it is formed inside the bulge 315, and between the tool entry hole 350 and the screw through hole 340, a screw thread (female thread) is formed on the main surface while communicating with each other. A machined screw hole 360 may be provided.

The tool entry hole 350 may be formed with a larger diameter than the screw through hole 340 and the screw hole 360, and accordingly, a step surface is formed at the boundary between the tool entry hole 350 and the screw through hole 340. (345) may be formed (see Figure 15). A dedicated tool can enter the inside of the abutment 300 through the tool entry hole 350, and when the dedicated tool enters the inside, the insertion depth of the tool is limited to a certain depth by touching the step surface 345. The rotational operation of the tool can also be performed stably.

The binding pipe portion 330 may include a plurality of slit-shaped cut grooves 332 and a plurality of binding pieces 334 formed between the cut grooves 332. A plurality of cutting grooves 332 may be formed at equal or unequal intervals along the circumferential direction of the tube at the bottom of the lower body coupling portion 320, and adjacent cutting grooves 332 may be formed by these cutting grooves 332. ) The binding pieces 334 may be formed one by one.

FIG. 16 is an enlarged view of the binding pipe portion shown in FIG. 14, in which the screw through hole 340' formed at a position corresponding to the binding pipe portion 330 among the screw through holes 340, that is, the binding pipe portion ( The screw through hole 340' formed inside the 330) may have an inner diameter that gradually increases downward, and for this purpose, the inner main surface of the binding pipe portion 330 may be formed in a tapered structure.

Here, the main surface (tapered inner main surface) of the screw through hole 340' inside the binding pipe part 330 may be surface treated to have a rough surface to increase friction with the screw 200, The surface (outer surface of the binding pipe) may also be surface treated to have a rough surface so that sufficient friction can be generated between the surfaces in contact when binding through surface contact with the binding object.

The lower wedge portion 230 may also have a rough surface as described above. When the surface of the lower wedge portion 230 is formed to be rough, the friction between the surface of the wedge portion 230 and the inner peripheral surface of the binding pipe portion 330 increases, allowing the screw 200 to rotate even when sinking down. Since directional slip, or more specifically, loosening of the screw 200, is suppressed, the connection between the implant body 100 and the abutment 300 can be stably maintained.

Figure 17 is a front view of an implant body applied to a dental implant structure according to an embodiment of the present invention, and Figure 18 is a cutaway perspective view of the implant body shown in Figure 17.

Referring to FIGS. 17 and 18 , an internal groove 120 may be formed on the inside of the implant body 100. This internal groove 120 may be provided with the binding portion 124 at its lower end, and a portion of the abutment 300 (abutment The body coupling portion 320 and the binding pipe portion 330 formed at the bottom of the body coupling portion 320 may be inserted and fixed.

A screw thread 110 for alveolar bone implantation may be formed on the outer surface of the implant body 100. In this case, the screw thread 110 may have a single or double screw structure with the same or different pitch in the height direction.

Specifically, the internal groove 120 formed on the inside of the implant body 100 has an opening exposed to the upper surface of the implant body 100 and is formed in an inverted truncated cone shape whose inner diameter gradually decreases downward from the opening. It may be composed of an inclined groove portion 122 with which the body coupling portion 320 is engaged, and the above-described binding portion 124, which is formed at a certain height at the bottom of the inclined groove portion 122 and where the binding pipe portion 330 is located. .

Figure 19 is a diagram illustrating various embodiments of the shape of the binding portion formed at the lower end of the abutment and the binding portion formed inside the implant body.

As shown in (a) to (c) of Figure 19, the outer surface shape of the binding pipe portion 330 may be configured as one of a circular shape, a regular polygon, and a Torx shape, and the binding portion 124 The cross-sectional shape (cross-sectional shape when viewed in plan) corresponds to the shape of the outer surface of the binding pipe portion 330, that is, the cross-sectional shape may be one of a circular shape, a regular polygon, and a Torx shape. .

Here, the outer surface of the binding pipe portion 330 is configured in a regular polygon or Torx shape, and the cross-sectional shape of the binding portion 124 (cross-sectional shape when viewed in plan) is adjusted to the shape of the outer surface of the binding pipe portion 330. If configured to have a corresponding shape, that is, a regular polygonal cross-sectional shape or a torx shape, rotation of the abutment 300 with respect to the implant body 100 during the coupling process or in the coupled state can be prevented.

Figure 20 is a diagram showing the fastening process of the dental implant structure described above.

Referring to FIG. 20, first, the bottom of the abutment 300 is positioned so that the binding pipe portion 330 at the bottom of the abutment 300 surrounds at least a portion of the lower wedge portion 230 formed on the screw 200. Insert the screw 200 so that it is screwed on the inside of the abutment 300 ((a) of Figure 20). In that state, the abutment 300 is inserted into the implant body 100 so that the binding tube portion 330 is located in the binding portion 124 of the implant body 100 (FIG. 17(b)).

Then, when the screw 200 is tightened with a dedicated tool (T), the screw 200 rises upward as shown by the arrow in (c) of FIG. 20 and the wedge portion 230 is pushed into the binding pipe portion 330. As you go, the binding tube 330 is opened. The open binding tube part 330 is strongly adhered to the surface of the binding part 124, and this causes strong friction between the binding tube part 330 and the binding part 124, causing the abutment (300) to be attached to the implant body 100. ) can be firmly fixed.

Figure 21 is a cross-sectional view comparing a representative example of the conventional internal connection method (Figure 21 (a)) and the present invention (Figure 21 (b)) among various methods of connecting the implant body and the abutment.

Referring to Figure 21, the embodiment of the present invention is a method in which the screw expands the lower part (binding tube portion) of the abutment to realize a strong bond between the implant body and the abutment, and the screw is directly fastened to the implant body. Compared to the conventional internal connection method that fixes the butt in the middle, the height of the contact area where the implant body and abutment directly contact can be secured higher (D2 > D1).

In other words, the present invention can achieve a deep connection structure between the implant body and the abutment for the same size compared to the conventional internal connection method as shown in (a) of Figure 21. Therefore, a more stable and robust bond can be realized, and since the screw thread, which is considered the main cause of fatigue failure of the implant body, is omitted from the implant body, it has the advantage of being much more advantageous in terms of durability.

In addition, since the screw expands the lower part of the abutment (binding tube) to achieve a strong bond between the implant body and the abutment, there is no need to worry about the screw loosening even when sinking down, and thus there is no need to worry about the screw loosening due to screw loosening. The problem of the prior art that the connection between the implant body and the abutment is unstable can be clearly and clearly resolved.

Moreover, due to the deep connection structure between the implant body and the abutment, stronger resistance to lateral loads can be secured among the loads applied to the abutment in complex from various directions, and the deep connection structure between the implant body and abutment By increasing the contact area between butts, the rigidity can also be greatly improved compared to the conventional internal connection method as shown in (a) of Figure 21.

In the above detailed description of the present invention, only special embodiments thereof have been described. However, it should be understood that the present invention is not limited to the particular form mentioned in the detailed description, but rather is understood to include all modifications, equivalents and substitutes within the spirit and scope of the present invention as defined by the appended claims. It has to be.

100: implant body
110: Screw thread (thread for installing the implant body into the alveolar bone)
120: internal groove
122: Inclined groove
124: binding part
126: Locking groove
200: screw
210, 210': Tool fastening part
220: body part
230. 230': Wedge part
260: threaded part
300: Abutment
310: Prosthesis joint
315: bulge
320: body joint
330: Binding tube
332: Cut groove
334: Bonding
335: Hole (hole formed inside the abutment)
336: Stopper
340: Screw through hole
350: Tool entry hole
360: screw hole

Claims (17)

In the dental implant screw that secures the abutment to the implant body installed in the alveolar bone,
A lower wedge portion whose diameter or cross-sectional area increases as at least a portion goes downward;
a body portion having a round bar structure extending from the top of the lower wedge portion to a certain height;
a screw portion extending from the top of the body portion of the round bar structure to a certain height and having male threads formed on the outer surface; and
A screw for a dental implant comprising a tool fastening part formed at the top of the screw part or in an upper area of the screw part and to which a dedicated tool is fastened.
In clause 1,
The lower wedge part,
A screw for a dental implant including a first region whose diameter or cross-sectional area gradually increases downward.
According to claim 2,
A screw for dental implants in which the surface inclination angle of the first area is 3 to 8 degrees.
According to claim 2,
A screw for dental implants in which the cross-sectional shape of the first region is circular.
According to claim 2,
A screw for dental implants in which the cross-sectional shape of the first region is a spline shape or a Torx shape with at least two grooves at equal or unequal intervals in the circumferential direction.
According to claim 2,
The lower wedge part,
A screw for a dental implant further comprising a second region formed at a predetermined height below the first region.
According to claim 6,
A screw for a dental implant in which the second region is formed to have the same diameter as the maximum diameter of the first region.
According to claim 6,
A screw for a dental implant in which the second region has an upper end formed with a diameter equal to the maximum diameter of the first region and whose diameter gradually decreases downward.
According to claim 1,
A screw for dental implants in which the lower wedge portion has a sphere shape.
According to claim 1,
A screw for dental implants in which the lower wedge portion has a rough surface.
According to claim 1,
A screw for a dental implant wherein the height (h1) of the screw portion is 1/2 to 4/5 of the height (h2) of the body portion.
According to claim 1,
A screw for dental implants in which the tool fastening portion is formed in the form of a multi-angled bolt head protruding upward from the top of the screw portion.
According to claim 12,
The tool fastening part is a screw for a dental implant in which the planar shape is formed in the shape of a bolt head that is one of rectangular, square, hexagonal, and octagonal.
According to claim 1,
A screw for a dental implant in which the tool fastening portion is formed in the shape of a socket or groove engraved in the direction of the thread portion.
According to claim 14,
The tool fastening part in the form of a socket or groove is a screw for dental implants formed in any one of the shapes of -, +, and polygonal grooves.
An abutment having a binding pipe portion in the lower region;
Any one of claims 1 to 15, wherein the device is concentrically disposed on the inside of the abutment and screwed inside the abutment, and has a lower wedge portion whose diameter or cross-sectional area gradually increases as at least a portion goes downward. Screws described in one clause; and
It includes an implant body in which a binding portion is formed corresponding to the binding tube portion and the lower wedge portion in the lower area of the internal groove where the abutment is coupled,
A dental implant structure in which the binding pipe portion is supported toward the binding portion as the screw rotates.
According to claim 16,
A screw is inserted from below the abutment so that the binding pipe portion surrounds at least a portion of the wedge portion and is screwed inside the abutment,
The binding pipe portion surrounding at least a portion of the wedge portion is inserted into the binding portion of the internal groove while the screw is screwed to the inside of the abutment,
When the screw is rotated in one direction while the binding pipe portion is inserted into the binding portion, the binding pipe portion is spread outward in the radial direction by the wedge portion of the screw that rises, thereby coupling the implant body and the abutment. For implant structure.

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