KR20230151783A - dental prosthesis system and screw applied to thereof - Google Patents

Abstract

In order to improve durability and precision, the present invention provides a prosthetic system coupled to an implant placed in the alveolar bone, which integrally penetrates one side of the artificial tooth in the longitudinal direction, and has a locking step with a restraining reference surface formed on the upper surface that protrudes in the radial inward direction. A prosthetic base with a connecting portion formed thereon; and a head portion formed with an outer diameter exceeding the inner diameter of the locking step, wherein a locking reference surface connected to the inclined end of the lower edge is formed on the lower surface so as to be locked by the locking reference surface, and the head portion protrudes from the lower surface of the head portion and is positioned on the top of the implant. A prosthetic system including a fastening screw including a threaded extension to be fastened is provided.

Description

Prosthetic system and fastening screw applied thereto {dental prosthesis system and screw applied to the same}

The present invention relates to a prosthetic system and a fastening screw applied thereto, and more specifically, to a prosthetic system with improved durability and precision and a fastening screw applied thereto.

In general, an implant refers to a substitute that can replace human tissue when the original human tissue is lost, but in dentistry, it involves transplanting an artificial tooth (hereinafter referred to as artificial tooth) or attaching an artificial tooth to the tooth root to fix it. This refers to the part that is installed. Here, it is desirable to understand that an implant as a part installed in the tooth root is a fixture.

In detail, the implant is made of titanium, etc., which is not objectionable to the human body in order to replace the lost tooth root, and the function of the tooth can be restored by placing the implant in the alveolar bone where the tooth has fallen out and then fixing the artificial tooth on the upper side. there is.

At this time, the artificial tooth may be provided in the form of a single crown individually corresponding to each tooth, and in some cases, it may be provided in the form of a partial prosthesis in which two or more artificial teeth are connected, or in the form of a complete prosthesis connected along the entire dental arch. Additionally, the implant may be installed singly or in plural pieces depending on the number of artificial teeth.

Meanwhile, an abutment, which is a component for interconnecting the implant and the artificial tooth, is provided. In detail, the abutment may be manufactured from the same material as the implant, and the lower end is fastened to the implant. Then, the upper end of the abutment is inserted into a coupling groove formed in the lower part of the artificial tooth, and the artificial tooth can be fixed to the abutment through a fastening screw.

Here, conventionally, the part coupled to the abutment is prepared and fixed separately from the artificial tooth. Through this, the component coupled to the abutment supports the electric load applied when the abutment is fastened with the fastening screw, thereby preventing damage to the artificial tooth.

In detail, conventionally, parts coupled to the abutment were prepared as support cylinders or metal frames. The support cylinder includes a coupling groove into which the upper end of the abutment is inserted, and is embedded and fixed to the embedment groove formed in the artificial tooth through a curable resin. The support cylinder is standardized and prepared for mass production. The metal frame is manufactured based on the same design information when designing the artificial tooth, and the coupling groove is formed at each placement position of the implant. The artificial tooth and the metal frame are attached and fixed through an adhesive applied to opposing surfaces.

At this time, the embedment hole is formed to penetrate the artificial tooth with a relatively large diameter, including an error between the outer diameter of the support cylinder, the actual placement position of the implant, and the embedment hole. Because of this, there was a problem that the durability of the artificial teeth against masticatory pressure was reduced. Additionally, as the process of embedding the support cylinder was added, there was a problem in that the overall manufacturing process and time for dental restorations increased.

Since the metal frame is manufactured to support the entire lower part of the artificial tooth, durability against masticatory pressure can be improved, but it is difficult to accurately design and manufacture between the artificial tooth and the metal frame. In addition, since the metal frame and the artificial teeth are made of substantially different materials, assembly precision is reduced, and an additional process is required to match this assembly precision. Moreover, the metal frame is manufactured using a method such as investment casting, but the process is complicated and takes a long time, which increases costs and delays tooth restoration.

Accordingly, in some cases, a structure has been disclosed in which the coupling groove is formed integrally with the artificial tooth, and the abutment is inserted into the coupling groove and fastened through the fastening screw. Since these artificial teeth do not require the process of embedding and fixing the support cylinder or manufacturing and assembling the metal frame, the overall process and period of tooth restoration can be shortened. However, there was a problem in that the portion where the coupling groove was formed was fractured due to the full load of the fastening screw being directly transmitted to the artificial tooth.

Korean Patent No. 10-0403834

In order to solve the above problems, the present invention aims to provide a prosthetic system with improved durability and precision and a fastening screw applied thereto.

In order to solve the above problem, the present invention provides a prosthetic system coupled to an implant placed in the alveolar bone to replace a lost tooth, wherein the upper part of the implant is inserted into one side of the artificial tooth portion formed in an external shape corresponding to the tooth. A prosthetic base that is integrally penetrated in the longitudinal direction and has a connecting portion formed with a locking step on the upper surface of which a restraining reference surface is formed and protrudes in the radial inward direction; and a head portion formed with an outer diameter exceeding the inner diameter of the locking step, wherein a locking reference surface connected to the inclined end of the lower edge is formed on the lower surface so as to be locked by the locking reference surface, and the head portion protrudes from the lower surface of the head portion and is positioned on the top of the implant. A prosthetic system including a fastening screw including a threaded extension to be fastened is provided.

Meanwhile, the present invention relates to a fastening screw for coupling a prosthetic base provided with a coupling portion to an artificial tooth portion replacing a lost tooth to an implant placed in the alveolar bone, wherein the upper surface of the locking step protrudes in the radial inward direction on the inner periphery of the coupling portion. A head portion formed to be inclined along a lower edge and a restraining reference surface that is constrained by surface contact to a locking reference surface formed to be perpendicular to the installation direction of the implant, and having a sloped end connected to the constraining reference surface; and a threaded extension portion that protrudes from the lower surface of the head portion and is fastened to the top of the implant.

Through the above solutions, the present invention provides the following effects.

First, the curved end formed on the outer periphery of the head part is molded along the curved groove formed on the inner circumference of the coupling part, and the fastening pressure is transmitted uniformly without being concentrated on a specific part, so that the prosthesis can be installed stably and firmly in the oral cavity.

Second, the locking reference surface and restraining reference surface continuously connected to the gradient end and the gradient groove are formed in a plane perpendicular to the installation direction of the implant, so that they come into surface contact with each other, and at the same time, the head of the fastening screw continuously enters while expanding the inside of the joint. By limiting the fastening pressure to be transmitted only in the direction of installation, fracture of the prosthesis due to excessive pressure applied in the radial outer direction can be prevented.

Third, fracture of the prosthesis due to fastening pressure is prevented through the locking reference surface and restraining reference surface at the inner end of the gradient end and the gradient groove, so the joint can be manufactured to penetrate the artificial tooth made of zirconia material, thereby simplifying the manufacture of prosthetics. And economic feasibility can be significantly improved through speed.

1 is a cross-sectional illustration of a prosthetic system according to an embodiment of the present invention.
Figure 2 is an enlarged cross-sectional view of portion A of Figure 1.
Figure 3 is a front view of a fastening screw according to an embodiment of the present invention.
Figure 4 is a partial enlarged cross-sectional view of a modified example of a prosthetic system according to an embodiment of the present invention.
Figure 5 is a front view of a modified example of a fastening screw according to an embodiment of the present invention.
Figure 6 is a cross-sectional illustration of the fastening process of the fastening screw according to an embodiment of the present invention.

Hereinafter, a prosthetic system and a fastening screw applied thereto according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

Figure 1 is a cross-sectional illustration of a prosthetic system according to an embodiment of the present invention, Figure 2 is an enlarged cross-sectional view of portion A of Figure 1, and Figure 3 is a front view of a fastening screw according to an embodiment of the present invention. And, Figure 4 is a partial enlarged cross-sectional view of a modified example of a prosthetic system according to an embodiment of the present invention, and Figure 5 is a front view of a modified example of a fastening screw according to an embodiment of the present invention. At this time, it is desirable to understand that the basic configuration of one embodiment and the modified example of the present invention is substantially the same except for the head portion.

At this time, the implant 9 to be described below is preferably understood to encompass the fixture 4 installed in the alveolar bone 1 and the abutment 5 provided on the upper side of the fixture 4. . The fixture 4 and the abutment 5 may be provided separately and fastened to each other, and in some cases, the fixture and the abutment may be provided as an integrated piece. Hereinafter, the fixture 4 and the abutment 5 are described and shown as an example of being separately provided and fastened to each other. Meanwhile, this embodiment explains and illustrates that the prosthetic system 300 is applied to the lower jaw as an example, and it is preferable to understand that the upper side of the fixture 4 corresponds to the direction of the opposing arch. The target arch 2, which will be described later, is the arch to which the prosthetic system 300 of the present invention is applied, and the opposing arch is preferably understood as an arch that occludes with the target arch 2.

1 to 3, the prosthetic system 300 includes a prosthetic base 301 and a fastening screw 10. At this time, in the present invention, the prosthetic system 300 is a part manufactured or prepared to replace a lost tooth, and is fixed to the implant 9 previously installed in the target arch 2.

The prosthesis base 301 preferably includes an artificial tooth portion 302 and a coupling portion 303.

In detail, it is preferable to understand that the artificial tooth unit 302 is a part that replaces a lost tooth. The prosthetic base 301 may be provided in the form of a plurality of artificial teeth connected along the row of teeth depending on the number of missing teeth, or may be provided in the form of a single crown. For example, the artificial tooth unit 302 may be provided in the form of a partial prosthesis in which two or three teeth are connected along the row of teeth. The partial prosthesis may be supported on the alveolar bone (1) through at least two or more implants (9). Of course, in some cases, in the case of edentulous patients, the artificial tooth unit 302 may be provided in the form of a complete prosthesis to replace the entirely lost teeth. The complete prosthesis can be supported on the alveolar bone (1) through a plurality of implants (9) provided along the row of teeth, and such modifications fall within the scope of the present invention.

That is, the artificial tooth unit 302 is manufactured in a shape corresponding to the number of missing teeth, and the implants 9 can be prepared in a number that can stably support the artificial tooth unit 302.

It is preferable to understand that the coupling portion 303 is a portion into which the fastening screw 10 is inserted and fixed in order to secure the artificial tooth portion 302 to the implant 9. The coupling portion 303 is preferably formed to penetrate the artificial tooth portion 302 in the longitudinal direction at each installation position of the implant 9. The coupling portion 303 preferably includes a coupling groove 306, a stopping step 305, and a through hole 304.

The coupling groove 306 is the upper part of the implant 9, preferably the part where the protrusion (hereinafter referred to as post, 5a) of the abutment 5 is inserted. The coupling groove 306 is preferably formed in a shape corresponding to the outer shape of the post 5a, and the inner shape of the coupling groove 306 corresponds to the shape of the post 5a or includes a predetermined gap. It is preferable that it is formed to exceed. A fitting portion 308 may be formed at the bottom of the coupling groove 306 to be fitted with the margin portion 5b formed on one side of the post 5a. The fitting portion 308 may be formed to protrude downward along the edge of the coupling groove 306 so that its lower edge is in contact with the margin portion 5b.

The through hole 304 communicates with the coupling groove 306 and is preferably formed in a cylindrical shape to accommodate the head portion 11 of the fastening screw 10. The inner diameter of the through hole 304 is preferably formed to correspond to or exceed the outer diameter of the head portion 11, including a predetermined gap.

The stopping step 305 is formed at the boundary between the coupling groove 306 and the through hole 304, and is preferably formed to protrude radially inward from the inner periphery of the coupling portion 303. At this time, it is desirable to understand that the inner circumference of the coupling portion 303 is substantially the inner circumference of the through hole 304. The locking step 305 is formed to protrude in a ring shape, and as the central portion of the locking step 305 penetrates, the coupling portion 303 can be formed to penetrate entirely along the longitudinal direction.

A restraining reference surface 305b is formed on the upper surface of the stopping step 305, and the restraining reference surface 305b is preferably connected to the gradient groove portion 307. The gradient groove portion 307 is preferably understood as a portion where the stopping step 305 and the lower edge of the through hole 304 are connected. The gradient groove portion 307 is preferably formed in a shape that matches the gradient end portion 14 of the fastening screw 10. The gradient end portion 14 will be described later.

The inner diameter of the stopping step 305 is preferably formed to exceed the outer diameter of the extension portion 12 of the fastening screw 10. Therefore, when the fastening screw 10 is inserted into the coupling part 303, the extension part 12 passes through the stopping step 305 and is coupled to the post 5a, and the head part 11 It is caught and restrained by the stopping step 305. And, while the fastening screw 10 is coupled to the post 5a, the prosthetic base 301 is coupled to the implant 9 through the force of the head portion 11 pressing the locking step 305. It can be fixed.

The prosthetic base 301 is preferably designed in consideration of the patient's vertical diameter and the occlusal relationship with the opposing arch. And, when the design information of the prosthetic base is transmitted to the manufacturing device, an actual prosthetic base 301 corresponding to the design information of the prosthetic base can be manufactured. Here, the prosthetic base 301 is preferably made of zirconia material based on the design information of the prosthetic base and is provided by firing. The prosthetic base 301 can be manufactured by CNC machining a zirconia block in response to the design information of the prosthetic base and then firing it. The zirconia block is manufactured in a block shape by injecting a mixture of zirconia-based materials containing zirconia powder into a compression mold and applying constant pressure.

At this time, the zirconia block shrinks when fired at a preset temperature. Therefore, it is desirable that the design information of the prosthetic base be expanded in volume by reflecting the previously calculated shrinkage error of the zirconia block. Through this, the prosthetic base 301 can be formed to a desirable size. Since the zirconia has high hardness, it can stably support the masticatory pressure and the fastening pressure of the fastening screw 10, so that the durability of the prosthetic base 301 can be significantly improved.

The fastening screw 10 preferably includes the head portion 11 and the extension portion 12.

In detail, the head portion 11 is formed with an inner diameter that exceeds the inner diameter of the stopping step 305, and may preferably be formed with an inner diameter less than the inner diameter of the through hole 304. It is preferable that a locking reference surface 13 is formed on the lower surface of the head portion 11 to be caught and restrained by the locking reference surface 305b. At this time, the locking reference surface 13 and the constraining reference surface 305b are preferably formed in a plane perpendicular to the installation direction of the implant 9.

It is preferable that the gradient end portion 14 is formed on the lower edge of the head portion 11. The gradient end portion 14 is preferably formed in a shape whose cross-sectional area decreases toward the lower part of the head portion 11. In addition, the catching reference surface 13 is preferably formed as a horizontal surface connected to the gradient end 14.

The extension part 12 protrudes from the lower surface of the head part 11 and preferably has a screw thread 16 formed on its outer circumference. The extension portion 12 is formed with an outer diameter less than the inner diameter of the stopping step 305.

Meanwhile, it is preferable that the catching reference surface 13 is continuously connected to the gradient end portion 14, and the constraining reference surface 305b is continuously connected to the gradient groove portion 307. At this time, it is desirable to understand that continuous connection means that the flat surface and the inclined surface are connected without bending or steps. Therefore, when the locking reference surface 13 is in surface contact with the constraint reference surface 305b, the continuous surface of the locking reference surface 13 and the gradient end 14 is connected to the constraint reference surface 305b and the gradient groove portion 307. It can be substantially compatible with the continuous surface of .

In addition, a gap is preferably formed between one outer circumference of the head portion 11 and the upper inner circumference of the coupling portion 303, preferably between one outer circumference of the head portion 11 and the through hole 304. That is, the lower surface of the head portion 11 and the portion where the inclined end portion 14 is formed are conformed to the upper surface of the stopping step 305 and the inclined groove portion 307, and the upper portion of the inclined end portion 14 is formed as above. It is formed to be spaced apart from the through hole 304 by a predetermined gap.

Therefore, when the fastening screw 10 enters the coupling part 303, the problem of the head part 11 interfering with the inner circumference of the through hole 304 and being misaligned can be fundamentally solved. In addition, when the lower part of the head part 11 is fitted with the upper side of the stopping step 305, the fastening pressure can be uniformly transmitted without being biased to one side in the radial direction of the engaging part 303.

The horizontal widths (w1, w11) of the inclined end portion 14 are adjusted to the inner periphery of the engaging portion 303 and the inner periphery of the engaging step 305 so that the constraining reference surface 305b and the engaging reference surface 13 are in surface contact ( 305a) It is preferable that the distance between them (w2, w12) is less than. More preferably, the horizontal widths (w1, w11) of the gradient end portion 14 may be less than the distance between the inner circumference of the through hole 304 and the inner circumference 305a of the stopping step 305. That is, the catching reference surface 13 between the inclined end 14 and the outer periphery of the extension part 12 may be formed as a horizontal surface corresponding to the preset horizontal intervals w3 and w13.

In addition, it is preferable that the horizontal spacing of the gradient groove portion 307 is less than the horizontal spacing of the stopping step 305 protruding in the radial inner direction of the coupling portion 303. Accordingly, the restraint reference surface 305b may be formed as a horizontal plane between the inner circumference 305a of the stopping step 305 and the inner circumference of the through hole 304.

The gradient groove portion 307 is preferably formed in a shape that conforms to the gradient end portion 14 when the constraining reference surface 305b and the engaging reference surface 13 are in surface contact. Therefore, when the fastening screw 10 is inserted into the coupling portion 303 and the head portion 11 is adjacent to the upper side of the stopping step 305, the gradient end portion 14 is formed in the gradient groove portion 307. can be combined. Through this, the pressure applied through the head portion 11 can be uniformly transmitted to the coupling portion 303. In addition, as the gradient groove portion 307 and the gradient end portion 14 are fitted with each other, the fastening pressure can be transmitted through the mutual mating surfaces without being concentrated on a specific part.

Furthermore, when the locking reference surface 13 makes surface contact with the restraining reference surface 305b, the head portion 11 may not continuously enter and the fastening position may be limited. Therefore, as the gradient end portion 14 is fitted with the gradient groove portion 307, it is possible to prevent fastening pressure from being continuously applied in the radial outer direction of the coupling portion 303. Through this, even if the coupling portion 303 is formed integrally with the prosthetic base 301, fracture due to the fastening pressure of the fastening screw 10 can be substantially minimized.

As such, the present invention is achieved through a combination of a sloped configuration so that the fastening pressure of the fastening screw 10 can be uniformly transmitted to the coupling portion 303 and a flat configuration that limits excessive entry of the head portion 11. A synergistic effect can be provided in which manufacturability and durability of the prosthetic system 300 are simultaneously improved.

In addition, it is preferable that a separation surface portion 305c is formed at the lower part of the stopping step 305 to be spaced apart from the upper end of the post 5a when one side of the coupling portion 303 makes surface contact with one side of the protrusion. At this time, it is preferable to understand that one side of the coupling portion 303 is the molding portion 308, and one side of the protrusion is the margin portion 5b. In some cases, one side of the coupling portion 303 may be the inner circumference of the coupling groove 306 and one side of the protrusion may be the outer circumference of the post 5a, which can be modified depending on the type of the abutment. These modifications are within the scope of the present invention.

Meanwhile, the gradient end portion 14 is preferably formed to be rounded at a preset radius value at the bottom of the outer circumference of the head portion 11. That is, as the lower outer circumference of the head portion 11 is rounded, the cross-sectional area of the head portion 11 naturally decreases toward the bottom, and through this, a curved slope can be formed.

Alternatively, referring to FIGS. 4 and 5 , the gradient end portion 114 may be formed in a cone shape inclined from the top of the outer circumference of the head portion 111 toward the bottom. Furthermore, the head portion 111 may be formed as a whole to have a cone shape, while the portion 114a where the inclined end portion 114 and the engaging reference surface 113 are connected may be formed to be round. Accordingly, the lower edge of the head portion 111 may be formed in a gently curved shape, and the portion where the stopping step 1305 and the gradient groove portion 1307 are connected may also be formed in a softly curved shape.

In addition, the gradient groove portion 1307 is preferably formed to conform to the gradient end portion 114 when the engaging reference surface 113 makes surface contact with the constraining reference surface 1305b. Through this, local strong pressure is prevented from being applied to the part where the head part 111 and the coupling part 1303 are joined to each other, so the coupling force of the prosthetic system 300 can be improved and durability can be significantly improved. there is.

That is, in the present invention, the gradient end 14 is formed only at the lower edge of the head portion 11 as shown in FIGS. 1 to 3, or the gradient end 114 as shown in FIGS. 4 to 5. ) may be formed to be slanted overall on the outer periphery of the head portion 111, and such modifications fall within the scope of the present invention.

Figure 6 is a cross-sectional illustration of the fastening process of the fastening screw according to an embodiment of the present invention.

Referring to FIGS. 1 to 6 , a narrow portion 15 may be formed along the upper edge of the head portion 11 with a gradient such that the cross-sectional area decreases toward the top.

In detail, the implant 9 is installed along the alveolar bone, which has a relatively high bone height, and the coupling portion 2303 is formed through the artificial tooth portion 2302 corresponding to the installation position of the implant 9. At this time, on the posterior tooth side of the artificial tooth portion 2302, the engaging portion 2303 may be formed to penetrate vertically substantially corresponding to the installation position of the implant 9. However, since the thickness of the teeth on the anterior side of the artificial tooth portion 2302 is relatively thin, when the engaging portion 2303 is formed vertically, it can be opened to the labial surface of the anterior tooth side. Therefore, the through hole 2304 may be formed to be inclined toward the lingual side on the anterior tooth side.

Here, as the cross-sectional area of the top of the head portion 11 decreases toward the top, the narrow portion 15 that is inclined along the top edge may be formed. Therefore, even if the fastening screw 10 is inserted into the inclined through hole 2304, the head portion 11 can be prevented from interfering with the inner periphery of the through hole 2304.

Meanwhile, terms such as “include,” “comprise,” “equip,” or “have,” as used above, mean that the corresponding component may be present, unless specifically stated to the contrary. Rather than excluding a component, it should be interpreted as allowing additional inclusion of other components. All terms, including technical or scientific terms, unless otherwise defined, have the same meaning as generally understood by a person of ordinary skill in the technical field to which the present invention pertains. Commonly used terms, such as terms defined in a dictionary, should be interpreted as consistent with the contextual meaning of the related technology, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the present invention.

As explained above, the present invention is not limited to the above-described embodiments, and modifications and implementations can be made by those skilled in the art without departing from the scope of the claims of the present invention. And such modifications fall within the scope of the present invention.

10: Fastening screw 11: Head part
12: extension 13: catching reference surface
14: gradient end 300: prosthetic system
301: prosthetic base 303: coupling portion
305: Stopping step 305b: Constraint reference surface
307: Gradient groove

Claims (10)

In a prosthetic system coupled to an implant placed in the alveolar bone to replace a lost tooth,
A prosthetic base that is integrally penetrated in the longitudinal direction so that the upper part of the implant is inserted into one side of the artificial tooth portion formed in an external shape corresponding to the tooth, and has a connecting portion formed with a locking step with a restraining reference surface formed on the upper surface that protrudes in the radial inward direction; and
A head portion is formed with an outer diameter exceeding the inner diameter of the locking step, and has a locking reference surface formed on the lower surface connected to the inclined end of the lower edge so as to be caught and restrained by the locking reference surface, and protrudes from the lower surface of the head portion and is fastened to the upper part of the implant. A prosthetic system comprising a fastening screw including a threaded extension. According to claim 1,
A prosthetic system, characterized in that the constraint reference surface and the locking reference surface are formed as a plane perpendicular to the installation direction of the implant. According to claim 2,
A gradient groove is formed connecting the coupling portion and the restraint reference surface,
The catching reference surface is continuously connected to the gradient end and the restraining reference surface is continuously connected to the gradient groove,
The gradient groove portion is aligned with the gradient end portion when the restraint reference surface and the engaging reference surface make surface contact, and a gap is formed between one side of the outer periphery of the head portion and the upper inner periphery of the coupling portion. According to claim 2,
A prosthetic system, characterized in that the horizontal width of the gradient end is less than the gap between the inner periphery of the coupling portion and the inner periphery of the latching step so that the restraint reference surface and the engaging reference surface are in surface contact. According to claim 1,
A prosthetic system, characterized in that a separation surface is formed at the lower part of the locking step to be spaced apart from the upper end of the protrusion when one side of the coupling portion makes surface contact with one side of the protrusion protruding from the top of the implant. According to claim 1,
A prosthetic system, characterized in that the gradient end portion is formed to be rounded at a preset radius value at the bottom of the outer circumference of the head portion. According to claim 1,
The prosthetic system is characterized in that the gradient end portion is formed in a cone shape inclined from the top of the outer circumference of the head portion to the bottom. In the fastening screw for coupling a prosthetic base provided with a coupling portion to an artificial tooth portion replacing a lost tooth to an implant placed in the alveolar bone,
A constraint reference surface that is constrained by surface contact to a locking reference surface formed to be perpendicular to the installation direction of the implant on the upper surface of the locking step protruding in the radial inward direction on the inner periphery of the coupling portion, and a gradient formed along the bottom edge and inclined to be connected to the constraint reference surface. A head portion having an end formed thereon; and
A fastening screw applied to a prosthetic system including a threaded extension portion that protrudes from the lower surface of the head portion and fastens to the upper part of the implant. According to claim 8,
A fastening screw applied to a prosthetic system, wherein the gradient end portion is rounded to fit with a gradient groove portion roundly connected to the inner circumference of the coupling portion at a preset radius value on the upper side of the locking step. According to claim 8,
A fastening screw applied to a prosthetic system, wherein the gradient end portion is formed in a cone shape to fit with a gradient groove portion on the upper side of the locking step that is inclined to become narrower from the inner periphery of the coupling portion toward the bottom.

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