Dental implant abutments

Abstract

The present invention relates to an abutment for a dental implant, the abutment for a dental implant according to the present invention includes a prosthesis fastening protrusion that protrudes outward and is formed so that the outer diameter of an upper end of an upper portion of the abutment to which a prosthesis is attached is larger than that of a portion directly below the upper portion, and a notch that divides the upper portion of the abutment into a plurality of sections, the prosthesis fastening protrusion having a shape in which a distance value from a vertical central axis (C) of the abutment to an outer surface of the fastening protrusion is not uniform depending on the position when viewed in horizontal cross section, and preferably, the prosthesis fastening protrusion has a shape in which a distance value from the vertical central axis (C) of the abutment to an outer surface of the fastening protrusion continuously decreases as it approaches the notch, and the distance value is largest at a center (F) of the outer surface of the section divided by the notch when viewed in horizontal cross section.

Description

[Technical field]

[0001] The present invention relates to an abutment for a dental implant onto which a prosthesis is fastened in a dental implant. [Background technology]

[0002] Generally, a dental implant is a substitute for a lost natural tooth. It is a fixture that is implanted in the alveolar bone and allowed to fuse with the alveolar bone for a certain period of time, and then an abutment and a prosthesis such as an artificial tooth are fixed on top of it, restoring the original function of the tooth.

[0003] An implant used in artificial teeth treatment is composed of a fixture with a screw thread formed on the outer periphery so that it can be implanted into the alveolar bone and an axial hole formed along the vertical central axis, an abutment whose lower part is inserted into the axial hole of the fixture and whose upper part has a prosthesis attached, and a fixing screw that fastens the fixture and abutment to secure them firmly, and the abutment has a screw insertion hole formed along the vertical central axis. In some cases, the abutment and the fixing screw may be formed integrally.

[0004] That is, the abutment is fastened and fixed to the fixture by a separate fixing screw or a fixing screw formed integrally at the bottom. Conventional separate fixing screws are composed of a head, a threaded portion, and a body portion that connects the head and the threaded portion, with a polygonal groove formed on the upper surface of the head into which a dental tool is inserted, and a thread formed on the lower portion of the body portion to form the threaded portion.

[0005] The abutment, in which a fixation screw that is fastened to the fixture is formed separately, has a screw insertion axial hole that penetrates from the upper end to the lower end, and the outer surface of the abutment consists of a portion that is inserted into the axial hole of the fixture and a portion to which the prosthesis is attached, and the inner surface of the screw insertion axial hole has a step portion D formed therein to prevent the fixation screw from moving downward and to which the bottom surface C of the head of the fixation screw comes into contact.

[0006] In the type in which the abutment and the fixing screw are separated, when the fixing screw is fastened, the practitioner inserts the fixing screw through the insertion hole of the abutment until it reaches the axial hole of the fixture while the abutment is seated in the axial hole of the fixture. Next, a dental tool such as a screwdriver is inserted into the polygonal groove formed on the upper end surface of the head of the fixing screw and the fixing screw is rotated, so that the bottom surface C of the head of the fixing screw is formed on the inner surface of the screw insertion axial hole of the abutment and comes into contact with the downward movement prevention step D of the fixing screw that prevents the fixing screw from moving downward, and the head of the fixing screw presses the abutment toward the fixture side, so that a strong tensile force is applied between the head and the thread of the fixing screw while the thread formed on the outer surface of the fixing screw is fastened to the thread formed on the inner surface of the axial hole of the fixture. As a result, the abutment is firmly fixed to the fixture by the fixing screw, and the prosthesis is attached to the firmly fixed abutment using an adhesive.

[0007] However, in conventional implants in which the fastening force between the fixture and abutment is obtained by tightly tightening the screw, and the prosthesis is fixed using an adhesive, the conventional fixation screw (i.e., a type of male thread) is fastened to the axial hole of the fixture (i.e., a type of female thread) and then tightly tightened, so that the fixation screw is subjected to a tensile force in the longitudinal direction. As a result, the upper surface of the thread of the fixation screw tightly adheres to the lower surface of the thread of the axial hole of the fixture, exerting a considerable fastening force, but has the following fundamental problems or limitations.

[0008] For example, when a conventional fixation screw is tightly tightened, the fixation screw can sufficiently strongly fix the abutment to the fixture. When the tensile force generated between the head and threads of the fixation screw is N, if the tensile force generated by tightening the fixation screw is weaker than N, the expected sufficient tensile force cannot be obtained, and a strong fastening force is not obtained.

[0009] In other words, when a tensile force weaker than N is applied between the head and threads of the fixation screw due to weak tightening, the force with which the top surface of the fixation screw thread adheres to the bottom surface of the threads on the inner surface of the axial hole of the fixture also weakens, weakening the fastening force between the threads. In such a situation, the fixation screw will gradually loosen even with a small rotational force caused by continuous vibration or impact generated by the bite force applied to the prosthesis, and the abutment connected to the fixture may often become loose.

[0010] In addition, in order to prevent the above-mentioned phenomenon, if the fixing screw is tightly fastened so that it does not loosen and a tensile force much stronger than N is applied, causing permanent deformation in the material of the fixing screw, fatigue will accumulate in the material of the fixing screw itself, and if further impact such as biting force is continuously transmitted to the fixing screw, there is a problem that the fixing screw may more easily break.

[0011] Furthermore, in conventional abutments, when biting forces are continuously applied to the abutment in various directions, the applied stress is transmitted to the fixation screw without being buffered and continues to accumulate between the head and threads of the fixation screw, ultimately causing the fixation screw to loosen and break.

[0012] As an example, as shown in Figure 8, when lateral occlusal force is applied to an abutment, a rotational force is generated in the abutment, with the point where the abutment and fixture are in close contact as the reference point. This rotational force generates a force that pushes upward on the fixation screw, which is applying a force that strongly adheres the abutment downward. However, there is a problem in that such stress continues to accumulate and causes the fixation screw to break.

[0013] The lower part of the abutment is inserted into the axial hole of the fixture and fastened. In the case of the occlusal type, after fastening of the fixture and abutment, the biting force is continuously applied without any buffering effect, and as time passes, the position of the abutment moves downward from the vertical position in the axial hole of the fixture when it was initially fastened with the fixing screw. This causes a sink phenomenon, in which the position of the abutment moves downward over time from the vertical position in the axial hole of the fixture when it was fastened with the fixing screw. In this case, a gap is generated between the bottom surface C of the head of the fixing screw and the step D formed on the inner surface of the screw insertion axial hole of the abutment to prevent the fixing screw from moving downward. As a result, the head of the fixing screw can no longer press the abutment downward to fix it to the fixture. As a result, no tensile force is generated between the head of the fixing screw and the threads, and the upper surface of the thread formed on the fixing screw does not firmly adhere to the lower surface of the thread formed on the inner surface of the axial hole of the fixture. In this state, the abutment moves within the axial hole of the fixture. Furthermore, whenever biting force is applied from various directions, stress is not uniformly distributed but concentrated in one place, which results in destruction of the alveolar bone, abutment neck, etc. Problems include fracture of the jaw neck, fracture of the fixture, fracture of the fixation screw, and loosening of the fixation screw. In general, in order to prevent problems caused by the sink phenomenon, conventional abutments have a problem in that after the fixation screw is initially fastened, it is used for a certain period of time so that occlusal force can be applied to the abutment, and then the fixation screw is fastened again to bring the head of the fixation screw into strong contact with one side of the abutment. In addition, even when the head of the fixation screw is in strong contact with one side of the abutment and tightly adheres to the fixture, if lateral pressure is continuously applied to the prosthesis, tensile force and lateral force are transmitted to the fixation screw via the abutment, which can cause the fixation screw to loosen or break.

[0014] In addition, as described above, when the fixing screw breaks due to various reasons, it has been necessary to take a lot of time and effort to remove the broken pieces of the fixing screw that remain in the state where the fixing screw is fastened to the female thread position on the inner surface of the axial hole of the fixture, and in some cases, there has been a problem that the broken pieces of the fixing screw cannot be completely removed.

[0015] Thus, conventional abutments that do not have the function of absorbing occlusal forces cause many problems.

[0016] Furthermore, in the case of conventional abutments, even after the abutment is bonded to the fixture, in order to bond the prosthesis to the top of the abutment, additional adhesive must be applied to the inside of the prosthesis and to the top of the abutment, and the prosthesis must be placed on the top of the abutment and pressed in the direction of the abutment (i.e., downward) for a considerable period of time, thereby attaching the prosthesis to the top of the abutment. In this case, the practitioner must apply additional adhesive to attach the prosthesis, and later, after the adhesive hardens, the practitioner must remove the adhesive residue remaining between the prosthesis and the abutment / gums one by one, and the patient must wait while continuing to press the prosthesis against the gums while the adhesive hardens, which causes many problems and inconveniences during the treatment.

[0017] Furthermore, when a prosthesis is fixed to an abutment using an adhesive, there is a problem that the adhesive can separate due to sustained biting force, causing the prosthesis to separate and become detached from the abutment. This means that when it is necessary to remove a prosthesis fixed to an abutment for some reason, it takes a lot of time and is painful. Summary of the Invention [Problem to be solved by the invention]

[0018] The object of the present invention is to provide an abutment for dental implants, which has a notch that starts from the upper end surface of the abutment to which a prosthesis is attached and continues for a certain section downward, dividing the upper part of the abutment into a plurality of sections, and in order to improve the elasticity of the sections, which affect the buffering function of occlusal force, a certain section of the notch that divides the upper part of the abutment into a plurality of sections is formed in a spiral or oblique shape, thereby lengthening the length of the sections and making the sections have a spiral shape, thereby maximizing the elastic restoring force, and as a result, providing a buffering function with strong elasticity when occlusal force is applied, and improving the defects of conventional implants that occurred due to the lack of buffering function of occlusal force, thereby extending the life of the implant.

[0019] Another object of the present invention is to provide an abutment for dental implants in which the width of a lower notch in a notch that divides the upper end of the abutment into a plurality of segments is significantly smaller than the width of an upper notch, thereby increasing the volume of the segments and reinforcing their strength, and the notches are formed in a spiral or oblique shape to create an inclined surface, so that when a segment is deformed by biting force, the width of the notch is significantly reduced at the lower part and the inclined surface created by the spiral notch quickly comes into contact with an adjacent segment, thereby dispersing the applied biting force well to the adjacent segment, even if the deformation is smaller than that of a notch formed vertically.

[0020] Generally, in the present invention, in order to provide the above-mentioned buffering function for the occlusal force after a prosthesis is fixed to an abutment in which the upper part of the abutment is separated into a plurality of pieces by notches, when a occlusal force is applied to the pieces separated into a plurality of pieces by the notches formed in the upper part of the abutment, the occlusal force must be buffered by elastic movement and restored, so that no hardened substance should be filled in the space between the pieces even after the prosthesis is fixed to the abutment. For this reason, if an adhesive is used to fill the spaces between the pieces as a method for fixing the abutment, the adhesive will fill the spaces between the pieces and then harden, making it impossible for the pieces to move elastically, and as a result, the buffering function is substantially lost. Another object of the present invention is to provide a dental implant abutment having a function of absorbing biting force, which solves the above problems and has a prosthesis fastening projection at an upper part of the abutment, the prosthesis being divided into a plurality of pieces for elastically connecting the prosthesis and the abutment, the prosthesis fastening projection having a diameter larger than that of the lower part. When a prosthesis is fitted onto the upper part of the dental implant abutment, the plurality of pieces enter the connecting hole of the prosthesis and undergo elastic inward deformation to return to their original state. The prosthesis fastening projection at the upper part of the abutment is fitted into a corresponding fastening groove in the connecting hole of the prosthesis and fastened. The prosthesis fastening projection can be easily and firmly connected to the corresponding fastening groove of the prosthesis without any additional adhesive by the elastic restoring force of the plurality of pieces.

[0021] Another object of the present invention is to provide an abutment for dental implant having a function of absorbing occlusal force, which includes forming spiral, oblique or vertical slot notches with closed upper and lower ends at regular intervals along the circumference at the lower part of the abutment to be inserted into the axial hole of the fixture, so that a plurality of independent surfaces formed along the circumference by the slot notches deform within an elastic range as the fixing screw is tightly fastened, and come into close contact with the inclined surface on the inner side of the axial hole of the fixture. At this time, an elastic repulsive force generated by the surfaces that deform within the elastic range and come into close contact generates a force pushing the abutment upward, which results in a force that continuously pushes the fixing screw, which is in contact with the step part D for preventing downward movement of the fixing screw, upward, and causes the upper surface 2a of the thread of the fixing screw to tightly adhere to the lower surface 3a of the thread formed on the inner surface of the axial hole of the fixture, thereby preventing the fixing screw from loosening and allowing it to return to its original shape after elastic deformation even when occlusal force is applied.

[0022] Another object of the present invention is to provide an abutment for dental implants which includes a separate fixing screw, the fixing screw being configured to have sufficient tensile strength, elastic restoring force and cushioning function by having a helical notch having a certain length on the top and bottom of the threads of the fixing screw, which penetrates horizontally through the vertical center axis of the fixing screw and equally divides a cross section perpendicular to the vertical center axis of the body part. This notch not only allows the fixing screw to maintain a firm fastening force for a long time, but also efficiently cushions the biting force continuously applied from the side or various directions, thereby preventing the fixing screw from breaking due to accumulation or concentration of stress.

[0023] Another object of the present invention is to make it possible to easily remove the broken pieces of the fixing screw remaining at the female thread position on the inner surface of the axial hole of the fixture, even when the fixing screw breaks, by clamping a straight-shaped screwdriver into the straight-shaped notch exposed on the broken end surface and rotating it.

[0024] Another object of the present invention is to prevent cold pressure welding, since the upper surface 12a of the thread of the fixing screw and the lower surface 3a of the thread formed on the inner surface of the axial hole of the fixture are firmly fastened by the elastic force of the spiral notch between the head and thread of the fixing screw, and to make it possible to easily remove the remaining part of the fixing screw when the fixing screw breaks.

[0025] Another object of the present invention is to provide a fixing screw with a helical spiral cutout at an upper portion of the thread portion having a strong elastic restoring force so that when the abutment and fixture are fastened, the helical section deforms within an elastic range to form a strong bond. Even if a sink phenomenon occurs in which the abutment moves downward due to sustained biting force after the internal type abutment is initially fastened, the helical section deforms elastically so that the abutment and fixture can be tightly attached with a force above a certain level without the need to retighten the fixing screw.

[0026] Another object of the present invention is to ensure the structural rigidity of the prosthesis fastening protrusion itself in some abutments, without the need to make structural modifications such as removing the portion where the prosthesis fastening protrusion of the abutment interferes with the connecting hole of the prosthesis when the prosthesis is fitted, or increasing the width of the cutout of the abutment.

[0027] Another object of the present invention is to prevent rotation of the prosthesis and identify the fastening position without processing a separate flat surface on the abutment, by inserting the prosthesis fastening protrusions, which are configured to protrude outward by non-uniform numerical values ​​from the outer surfaces of the pieces divided into a plurality of pieces by notches formed on the upper part of the abutment, into the connecting holes of the prosthesis and engaging with the corresponding shapes of the fastening grooves of the prosthesis to fasten them. [Means for solving the problem]

[0028] One embodiment of the present invention for achieving the above object is an abutment for a dental implant, the abutment having an upper end portion on which a prosthesis is attached having an outer diameter larger than that of a portion directly below the upper end portion, the prosthesis fastening protrusion protruding outward, and a notch portion dividing the upper portion of the abutment into a plurality of pieces, the prosthesis fastening protrusion having a shape in which the numerical distance from the vertical center axis C of the abutment to the outer surface of the fastening protrusion is not uniform depending on the position when viewed in horizontal cross section.

[0029] Preferably, when viewed in horizontal cross section, the prosthesis fastening protrusion has a shape in which the distance value from the vertical central axis C of the abutment to the outer surface of the fastening protrusion continuously decreases as it approaches the notch, and the distance value is greatest at the center F of the outer surface of the slice divided by the notch. Effect of the Invention

[0030] According to the present invention, a prosthesis can be attached to the upper part of the abutment by a simple operation without adhesive, a strong fastening force can be maintained for a long time, a occlusal force continuously applied from the side or various directions can be efficiently buffered, a phenomenon of loosening and fracture of the fixing screw due to accumulation or concentration of stress can be prevented, a phenomenon of the abutment being cold-welded to the insertion part of the axial hole of the fixture can be prevented, and when it is necessary to separate the abutment from the fixture, the abutment can be easily removed, and even when the fixing screw is broken, a broken piece of the fixing screw remaining at the position of the female thread on the inner surface of the axial hole of the fixture can be easily removed by clamping a straight-type driver in the notch exposed on the broken end surface and rotating it. There is no need to make structural changes such as removing a part that causes interference with the connecting hole when fitting the prosthesis or increasing the width of the notch, and the structural rigidity of the prosthesis fastening protrusion itself can be sufficiently secured, and it is possible to prevent the prosthesis from rotating and identify the fastening position without processing a separate flat part on the abutment. [Brief description of the drawings]

[0031] [Figure 1a] FIG. 1a is a perspective view of a set screw according to one embodiment of the present invention. [Figure 1b] FIG. 1b is a cross-sectional view taken along line AA in FIG. 1a and a perspective view showing the cut surface thereof. [Figure 2a] FIG. 2a is a perspective view of an implant abutment according to one embodiment of the present invention. [Figure 2b] FIG. 2b is a perspective view of an implant abutment according to another embodiment of the present invention. [Figure 3a] FIG. 3a is a cross-sectional view showing a state in which the separately provided fixing screw of FIG. 1a is coupled to the implant abutment of FIG. 2a according to an embodiment of the present invention. [Figure 3b] FIG. 3b is a schematic diagram showing the action of a fixing screw on the implant abutment in the combined state of FIG. 3a. [Figure 4a] FIG. 4a is a perspective view of an implant abutment according to still another embodiment of the present invention. [Figure 4b] FIG. 4b is a perspective view of an implant abutment according to yet another embodiment of the present invention. [Diagram 5] FIG. 5a is a cross-sectional view of a fixing screw according to still another embodiment of the present invention, and FIG. 5b is a conceptual diagram showing the operation of the fixing screw shown in FIG. 5a. [Figure 6] FIG. 6 is a perspective view of a set screw according to another embodiment of the present invention. [Figure 7] FIG. 7 is a perspective view of a prosthesis X bonded adhesively to the top of an abutment in accordance with the present invention. [Figure 8] FIG. 8 is a cross-sectional view of a modified embodiment of an abutment having a varying inclination of the outer surface according to still another embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view of an alternative embodiment of a prosthesis fastening projection in accordance with yet another embodiment of the present invention. [Figure 10]FIG. 10 is a cross-sectional view of an alternative embodiment of the upper portion of an abutment in accordance with yet another embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view of an implant abutment according to still another embodiment of the present invention. [Figure 12] FIG. 12 is a cross-sectional view of an alternate embodiment of a prosthesis fastening projection in accordance with yet another embodiment of the present invention. [Figure 13] FIG. 13 is a reference diagram for explaining the effect obtained when applying the abutment according to the modified embodiment shown in FIG. [Figure 14] FIG. 14 is a cross-sectional view showing a force pushing a fixing screw upward due to a rotational force generated when a lateral bite force is applied to an abutment in the conventional technology. [Figure 15] FIG. 15(a) is a perspective view of an implant abutment according to still another embodiment of the present invention, and FIG. 15(b) is a plan view of FIG. 15(a) seen from directly above. [Figure 16] Figure 16(a) is a cross-sectional view showing the stage at which the prosthesis X begins to be bonded to the upper part of the implant abutment shown in Figure 15(a), and Figure 16(b) is a cross-sectional view taken along lines BB and CC in Figure 16(a). [Figure 17] FIG. 17(a) is a cross-sectional view showing a hypothetical stage just before prosthesis X is fastened to the top of the implant abutment shown in FIG. 15(a), and FIG. 17(b) is a cross-sectional view taken along line AA in FIG. 17(a) to show the interference area that occurs when the prosthesis is joined. [Figure 18] FIG. 18(a) is a plan view of a modified embodiment of the prosthesis fastening projection in which additional processing has been performed to remove the interference portion shown in FIG. 17(b), and FIG. 18(b) is a cross-sectional view taken along line CC when the prosthesis fastening projection in FIG. 18(a) is inserted to the corresponding position in FIG. 17(a). [Figure 19] FIG. 19(a) is a cross-sectional view showing the prosthesis X completely fastened to the upper part of the implant abutment shown in FIG. 18(a), and FIG. 19(b) is a cross-sectional view taken along line DD in FIG. 19(a). [Figure 20] FIG. 20(a) is a perspective view of an implant abutment according to still another embodiment of the present invention, and FIG. 20(b) is a plan view of FIG. 20(a) seen from directly above. [Figure 21] Figure 21(a) is a cross-sectional view showing the stage at which the prosthesis X begins to be bonded to the upper part of the implant abutment shown in Figure 20(a), and Figure 21(b) is a cross-sectional view taken along lines BB and CC in Figure 21(a). [Figure 22] Figure 22(a) is a cross-sectional view showing the stage just before the prosthesis X is fastened to the upper part of the implant abutment shown in Figure 20(a), and Figure 22(b) is a cross-sectional view taken along line CC in Figure 22(a). [Figure 23] Figure 23(a) is a cross-sectional view showing the prosthesis X completely fastened to the upper part of the implant abutment shown in Figure 20(a), and Figure 23(b) is a cross-sectional view taken along line DD in Figure 23(a). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

[0033] Fig. 1a is a perspective view of a fixation screw according to one embodiment of the present invention, Fig. 1b is a perspective view showing a cross-section along line AA in Fig. 1a and a cutaway view thereof Fig. 2a is a perspective view of an implant abutment according to one embodiment of the present invention, and Fig. 2b is a perspective view of an implant abutment according to another embodiment of the present invention.

[0034] Referring to Fig. 2a, in the abutment 200 for dental implant of the present invention, the upper outer surface of the abutment on which the prosthesis is attached maintains a taper angle in which the outer diameter decreases from the position where the margin of the prosthesis is located toward the upper side, and the outer diameter at the bottom of the upper end surface is larger than that at the bottom, forming a prosthesis fastening protrusion 210 that protrudes outward from the taper surface. Also, as shown in Figs. 2a and 2b, notches 220, 220' that divide the upper part of the abutment into a plurality of sections are formed starting from the upper end surface of the abutment and continuing for a certain distance downward. Preferably, the notches 220, 220' are formed at at least two places in the upper part of the abutment, so that the upper part of the abutment can be divided into at least two or more sections. For reference, FIG. 2a shows the top of the abutment divided into four sections by four notches, and FIG. 2b shows the top of the abutment divided into two sections by two notches.

[0035] In this way, since the upper part of the abutment is divided into a plurality of pieces by the notches, when a prosthesis is fitted onto the upper part of the abutment for a dental implant according to the present invention, the plurality of pieces can elastically deform inwardly while entering the connecting hole of the prosthesis, and further, when the prosthesis fastening projection 210 is fitted into and fastened with the corresponding fastening groove portion X1 in the connecting hole of the prosthesis X, the prosthesis fastening projection 210 can be firmly connected to the corresponding fastening groove portion X1 by the elastic restoring force of the plurality of pieces. According to the present invention, as shown in Fig. 7, the prosthesis X can be connected to the upper part of the abutment 200 by a simple operation without using an adhesive.

[0036] Preferably, a flat surface 250 is formed on a portion of the circumferential surface on which the prosthesis fastening protrusion 210' is formed, as shown in Fig. 2b. Such a flat surface 250 determines the seating direction of the prosthesis when the prosthesis is fixed, and prevents the prosthesis from rotating after it is seated. Preferably, the flat surface may be formed as an inclined surface having a taper angle equal to or greater than the taper angle of the abutment.

[0037] More preferably, the notches 220, 230 may be formed in a spiral or oblique shape starting from the upper end surface of the abutment toward the lower side, as shown in Figures 2a and 2b. Such a spiral or oblique notch is intended to increase the elastic deformation force and elastic restoring force of the upper part of the abutment, and at the same time, to complement the abutment's function of absorbing the biting force and preventing the fixation screw from loosening.

[0038] That is, the notches 220 and 230 are formed in a spiral or oblique shape, and the multiple independent surfaces formed along the circumference can deform within an elastic range to cushion the bite force. In particular, the multiple independent surfaces formed along the circumference can cushion the bite force applied continuously during chewing food by continuously deforming and restoring within an elastic deformation range.

[0039] In particular, it is preferable that the incision direction of the helical or oblique cutout portion formed in a certain section from the upper part to the lower part of the incision section is formed in the same direction as the rotation direction for fastening the fixing screw which is responsible for fastening with the fixture, and as an effect of this, when a occlusal force is applied to the abutment through the prosthesis, the occlusal force is transmitted through the helical spiral piece formed in the upper part of the abutment, and a force is exerted on the lower fixing screw in a direction for fastening the fixing screw, thereby preventing the fixing screw from loosening. In particular, in an abutment in which the part where the fixing screw and the prosthesis are connected is integrally formed, the effect of preventing the fixing screw from loosening can be more significantly exhibited.

[0040] FIG. 4a is a perspective view of an implant abutment according to still another embodiment of the present invention, and FIG. 4b is a perspective view of an implant abutment according to still another embodiment of the present invention.

[0041] 4a and 4b, a dental implant abutment 300 having a prosthesis mounting portion and a threaded portion integrally formed thereon according to another embodiment of the present invention includes a threaded portion 360 having a predetermined vertical length and having a thread formed on an outer circumferential surface thereof, a prosthesis mounting portion 340 integrally formed on an upper portion of the threaded portion to which a prosthesis is fixed, and a body portion 350 connecting the threaded portion and the prosthesis mounting portion and having a helical cutout portion 352 formed in a predetermined length in the longitudinal direction thereof. The helical cutout portion 352 is formed to extend horizontally through the vertical central axis of the body portion and to a predetermined length in the longitudinal direction of the vertical central axis of the body portion, so as to equally divide a cross section perpendicular to the vertical central axis.

[0042] As described above, the outer surface of the upper part of the abutment on which the prosthesis of the prosthesis mounting part is mounted maintains a taper angle in which the outer diameter decreases from the position P where the margin of the prosthesis is located toward the upper part, as shown in Fig. 4a, and the outer diameter at the lower part of the upper end surface is larger than that at the lower part, and the prosthesis fastening protrusions 310, 310' protruding outward from the taper surface are formed. Also, as shown in Figs. 4a and 4b, the notches 320, 320' dividing the upper part of the abutment into a plurality of segments are formed continuously for a certain section starting from the upper end surface of the abutment toward the lower side, and are formed in a spiral or oblique shape of a certain section. Preferably, the notches 320, 320' are formed at least one or more in the upper part of the abutment, and the upper part of the abutment can be divided into at least two or more sections.

[0043] As described above, the piece having a protruding portion on the outer surface of the upper part of the abutment with a larger diameter than the lower part is deformed toward the vertical central axis during the process of mounting the abutment on the prosthesis, and then returns to its original state to be coupled with the concave groove formed on the bottom surface of the inner axial hole of the prosthesis, thereby enabling the abutment to be coupled to the prosthesis without adhesive. In addition, the piece has a helical or oblique helical shape of a certain section rotated around the vertical central axis of the abutment by a helical or oblique notch, thereby cushioning the bite force applied during chewing food.

[0044] Preferably, a flat portion 350 having a taper angle equal to or greater than the taper angle of the abutment is formed on a portion of the circumferential surface on which the prosthesis fastening protrusion 310' is formed. Such a flat portion 370 specifies the seating direction of the prosthesis and complements the function of preventing the prosthesis from rotating.

[0045] 1a and 1b, a fixing screw 100 separately provided in the dental implant abutment of the present invention is configured to include a threaded portion 12 having a predetermined vertical length and having threads 12a, 12b formed on its outer peripheral surface, a head 20 formed on the upper side of the threaded portion and having a polygonal coupling groove 22 formed on its upper end surface into which a driver is inserted, and a body portion 10 that connects the threaded portion 12 and the head 20 and has a helical spiral notch 14 formed in a certain length in the longitudinal direction.

[0046] Preferably, the helical notch 14 is formed to extend horizontally through the vertical central axis of the body part 10 and to a certain length in the longitudinal direction of the vertical central axis of the body part 10, so as to equally divide a cross section perpendicular to the vertical central axis, as shown in FIG. 1b. The helical notch 14 may be selectively formed in a clockwise or counterclockwise direction. The helical notch 14 may also be selectively formed in the threaded portion 12. Furthermore, the body part 10 may extend below the threaded portion 12, and an additional helical notch 16 may be further formed in the extension of the body part 10.

[0047] It is also preferable that the cutting direction of the helical notch formed between the head and thread of the fixing screw is the same as the direction of the thread of the fixing screw.

[0048] 2a and 2b, the dental implant abutment 200 of the present invention has a plurality of slots 240, 240' formed along the circumference at the lower part of the abutment to be inserted into the axial hole of the fixture. Preferably, at least one end of the lower part of the abutment to be inserted into the axial hole of the fixture is closed, and a plurality of slots 240, 240' penetrating from the outer diameter to the inner diameter are formed at regular intervals along the circumference. Preferably, the slots 240, 240' may be formed in the shape of a diagonal line, a vertical line, or a horizontal line.

[0049] When the fixing screw is tightly fastened, the multiple independent surfaces formed along the circumference by the oblique slot notch 240, 240' deform within an elastic range and come into close contact with the inclined surface of the inner surface of the axial hole of the fixture. At this time, an elastic repulsive force generated by the surfaces that deform within the elastic range and come into close contact generates a force pushing the abutment upward. As a result, a force is generated that continuously pushes the head of the fixing screw that is in contact with the downward movement prevention step portion D of the fixing screw of the abutment upward. As a result, the upper surface of the thread of the fixing screw comes into strong contact with the lower surface of the thread formed on the inner surface of the axial hole of the fixture, preventing the fixing screw from loosening.

[0050] In addition, the continuous biting force applied when chewing food is buffered by multiple independent surfaces formed along the circumference that continuously deform and restore within the elastic deformation range. This action prevents the cold welding phenomenon that occurs when the abutment adheres too tightly to the insertion shaft hole of the fixture, and makes it easy to separate the abutment from the fixture whenever necessary.

[0051] FIG. 3a is a cross-sectional view showing a state in which the fixing screw of FIG. 1a, which is separately provided according to one embodiment of the present invention, is coupled to the implant abutment of FIG. 2a, and FIG. 3b is a conceptual diagram showing the action of the fixing screw on the implant abutment in the coupled state of FIG. 3a.

[0052] 3a and 3b, the helical notch 14 formed in the body 10 of the fixation screw 100 increases the elastic deformation force and elastic restoring force of the fixation screw itself, so that the fixation screw of the present invention functions to more firmly fasten the abutment to the fixture compared to the conventional fixation screw. That is, the fixation screw 100 of the present invention can accommodate more fastening energy, i.e., stronger fastening force, by increasing the absolute length that can be elastically deformed due to the helical notch 14 and having a stronger elastic restoring force after elastic deformation, and as a result, it can have a stronger fastening force than the conventional fixation screw, and problems such as loosening of the fixation screw can be prevented in advance.

[0053] The helical notch 14 is formed in at least a certain section between the upper end and the lower end of the body part 10, and preferably, the helical notch 14 is formed in a portion of the body part 10 connecting the thread part 12 and the head part 10. Referring to Figs. 3a and 3b, when the thread part 12 of the fixing screw 100 is screwed into the thread 3 formed on the inner surface of the axial hole of the fixture 1 and the fixing screw is continuously tightened, the fixing screw 100 is extended by a certain length within the elastic deformation range due to the elastic force of the helical notch 14, and the elastic restoring force of the helical notch 14 acts to strongly pull the thread part 12 of the fixing screw upward as shown by the arrow in Fig. 3a. As a result, as shown in FIG. 3(b), the upper surface 12a of the thread of the fixing screw adheres strongly to the lower surface 3a of the thread, which is formed to correspond to the inner surface of the axial hole of the fixture 1, ensuring a stronger fastening force between the engaged threads. As a result, the loosening phenomenon of the fixing screw can be significantly reduced.

[0054] It is preferable that the direction of the helical notch formed between the head and the thread of the fixing screw is the same as the direction of the thread of the fixing screw.

[0055] Preferably, as shown in FIG. 5, the helical notch 16 may also be formed in a helical shape at the bottom of the thread 12 formed on the body 10. In this case, if the fixing screw 100 is still tightly fastened after the end of the fixing screw 100 comes into contact with the bottom of the axial hole of the fixture, the bottom of the axial hole of the fixture and the bottom of the fixing screw come into contact with each other, compressing the helical helical notch at the bottom of the thread, generating an elastic restoring force, which acts to strongly push the thread of the fixing screw upward. As a result, as in FIG. 3b, the upper surface 12a of the thread of the fixing screw is tightly adhered to the lower surface 3a of the thread formed to correspond to the inner surface of the axial hole of the fixture 1, ensuring a stronger fastening force, and as a result, the loosening phenomenon of the fixing screw can be significantly reduced. The fixing screw of the present invention is preferably manufactured from a metal having excellent elasticity, such as a Ni-Ti alloy.

[0056] More preferably, the head 20 of the fixation screw 10 may further include a screw loosening prevention protrusion 26 at a certain location on its outer circumferential surface, as shown in FIG. 1a. For example, when the implant abutment 200 of FIG. 2a is fastened to a fixture using the fixation screw 10 of FIG. 1a, the screw loosening prevention protrusion 26 may be fitted into a spiral or oblique notch 230 formed on the upper part of the abutment, thereby complementarily preventing the fixation screw from loosening.

[0057] As described above, when the fixation screw 100 according to the present invention is fastened only within the elastic deformation range, the helical notches 14, 16 ensure greater elasticity and elastic restoring force than existing fixation screws. Therefore, the upper surface 12a of the thread of the fixation screw can more strongly and continuously maintain the force with which it tightly adheres and presses the lower surface 3a of the thread formed on the inner surface of the axial hole of the fixture. As a result, there is an advantage that the fastening force for fastening the abutment 15 to the fixture 1 does not decrease even over a long period of time.

[0058] 1a and 5, the spiral notches 14, 16 formed in the body 10 of the fixation screw can perform a stress buffering function due to their own structural characteristics and elastic restoring force. That is, even if lateral pressures in various directions are applied to the abutment due to bite force or the like, and a force is generated that pushes the fixation screw sideways or lifts the head of the fixation screw upward, the structure of the spiral notch itself can buffer such forces, and as a result, stress applied from the side or above is not accumulated in the fixation screw itself, and therefore the possibility of the fixation screw breaking is significantly reduced.

[0059] In addition, the conventional problems with internal types in which the lower part of the abutment is inserted into the axial hole of the fixture for fastening can also be solved by the elastic restoring action of the spiral notch of the present invention. That is, as described above, even after the fixing screw is initially fastened with a strong fastening force, there is a risk of the abutment sinking downward over time, but even if the abutment moves downward from its initial fastening position due to this sinking phenomenon, the elastic restoring action of the spiral notch pulls the head of the upper end of the fixing screw downward, thereby allowing the strong fastening force to be maintained as is.

[0060] Meanwhile, even if the fixing screw is broken due to various reasons, the breakage occurs at the relatively weak point, the helical notch, and in this case, as shown in Figure 1b, the broken surface has a linearly exposed helical notch that penetrates the vertical central axis. Therefore, by clamping a straight-line screwdriver into the linear notch and rotating it, the broken pieces of the fixing screw remaining on the inner surface of the axial hole of the fixture can be easily removed.

[0061] Fig. 6 is a perspective view of a fixing screw according to another embodiment of the present invention. Referring to Fig. 6, a helical notch is formed at the bottom of the thread of the fixing screw of the present invention, a line-shaped, cross-shaped or polygonal protrusion is formed on the bottom surface of the lowest end of the fixing screw, and a corresponding groove is formed at the lowest end of the axial hole of the fixture, so that the tightening rotation position of the fixing screw can be specified and the fixing screw can further perform a function of preventing loosening.

[0062] In other words, when the fixing screw is tightened, the protrusion on the bottom of the lower end of the fixing screw comes into contact with the upper surface of the lower end surface of the axial hole of the fixture before the lowermost surface where the corresponding groove is formed. If the fixing screw is continued to be tightened in this state, the helical spiral notch at the bottom of the thread of the fixing screw rotates while being compressed, and at the point where the protrusion on the bottom of the lowermost surface of the fixing screw and the corresponding groove formed on the lowermost surface of the axial hole of the fixture coincide with each other, the elastic restoring force of the spiral notch at the bottom of the thread of the fixing screw causes the protrusion on the bottom of the lowermost surface of the fixing screw to be coupled with the groove on the lowermost surface of the axial hole of the fixture. In order to release this coupling, a horizontal rotational force of a certain level or more must be directly applied to the fixing screw, so that the fixing screw can be prevented from loosening due to everyday biting force.

[0063] Fig. 8 is a cross-sectional view of a modified embodiment in which the inclination of the outer surface of the abutment changes according to another embodiment of the present invention. Referring to Fig. 8, the inclination of the outer surface of the abutment changes at least twice between the upper point (preferably, the upper 1.5 mm point) of the maximum diameter part of the abutment where the margin part of the prosthesis is located and the immediately lower part B of the prosthesis fastening protrusion 210'. That is, the outer surface of the abutment may be composed of a first inclined outer surface L1, a first vertical outer surface L2, a second inclined outer surface L3, and a second vertical outer surface L4 in the upward direction from the upper point A of the maximum diameter part of the abutment. By configuring the outer surface of the abutment to have at least two or more changes in inclination, the horizontal thickness of the prosthesis fastening protrusion at the upper part of the abutment can be further ensured, and as a result, when the prosthesis is fastened to the prosthesis fastening protrusion at the upper part of the abutment, the bonding strength can be reinforced or increased. For example, if the same inclination angle is formed from the upper point A of the maximum diameter portion of the abutment to the lower end of the prosthesis fastening projection, the horizontal thickness of the prosthesis fastening projection at the upper part of the abutment will be too thin to firmly connect or support the prosthesis when it is fastened, which may result in problems such as the prosthesis shaking or being broken.

[0064] Fig. 9 is a perspective view of a modified embodiment of a prosthesis fastening protrusion according to another embodiment of the present invention. Referring to Fig. 9, a prosthesis fastening protrusion 210' is further formed with a prosthesis fastening position recess 210a' recessed inwardly, which identifies the fastening position of the prosthesis when the prosthesis is attached and prevents the prosthesis from rotating. That is, the prosthesis fastening position recess 210a' not only serves to identify the exact fastening position where the prosthesis should be positioned when the prosthesis is applied to the practitioner, but also prevents the prosthesis from rotating due to a force applied to the prosthesis when the prosthesis is later completed.

[0065] FIG. 10 is a cross-sectional view of a modified embodiment of the upper part of an abutment according to another embodiment of the present invention. Referring to FIG. 10, the inclination of the outer surface of a certain section directly below the prosthesis fastening protrusion may be formed with a smaller inclination than the inclination of the outer surface of the lower 1 / 3 of the section between the maximum diameter part of the abutment where the margin part of the prosthesis is located and the upper end of the abutment, and in some cases, a vertical section with zero inclination that maintains the same diameter for a certain section may be formed. When the prosthesis is attached to and detached from the prosthesis fastening protrusion of the abutment multiple times, a problem may occur in that the part of the prosthesis (shown as a circle) that protrudes sharply on the inside of the prosthesis is worn or cracked. Therefore, by forming a sloped section with a smaller inclination or a vertical section with zero inclination in a certain section downward from the directly below the prosthesis fastening protrusion, the durability of the prosthesis itself that is coupled to the directly below the fastening protrusion of the abutment can be reinforced.

[0066] Fig. 11 is a cross-sectional view of an abutment for an implant according to another embodiment of the present invention. Referring to Fig. 11, a through hole penetrating from the upper end surface to the lower end surface of the abutment may be configured such that the inner diameter D1 of the upper side of the through hole is kept constant for a certain section, and then the inner diameter D2 is larger below the upper side. According to such a through hole structure, the thickness of the fastening portion on the upper side of the abutment where the prosthesis fastening protrusion 220' is located increases, and the connection strength can be further reinforced when the prosthesis is fastened. Preferably, the inner diameter D3 on the lower side of the through hole may be configured to be smaller than the inner diameter D1 on the upper side of the through hole.

[0067] Fig. 12 is a cross-sectional view of a modified embodiment of a prosthesis fastening protrusion according to still another embodiment of the present invention, and Fig. 13 is a reference view for explaining an effect obtained when performing an abutment according to the modified embodiment shown in Fig. 12. Referring to Fig. 12, the prosthesis fastening protrusion is configured so that the outer diameter gradually increases from its upper end toward the lower side, and as a result, when viewed in vertical cross section of the prosthesis fastening protrusion, it is formed asymmetrically from the top to the bottom with respect to the maximum protuberance point of the prosthesis fastening protrusion, and a part of the outer surface 220c' of the prosthesis fastening protrusion is configured to have a predetermined angle of inclination. For example, if a portion of the outer surface 220c' of the prosthesis fastening protrusion has an inclined shape, the upper end of the inclined outer surface 220c' can be more easily inserted and advanced into the corresponding connecting hole of the prosthesis. In particular, as shown in FIG. 13, even if the implantation angle of adjacent abutments is too large and the adjacent prostheses are not easily fastened due to interference between them, the upper end of the outer surface 220c' of the prosthesis fastening protrusion can be clamped into the connecting hole of the prosthesis with less resistance. When the prosthesis is pressed toward the abutment after being clamped, the protruding fastening portion of the prosthesis having an inner notch deforms inwardly to reduce resistance, and at the same time, the prosthesis can slide along the inclined outer surface 220c' of the protruding fastening portion of the prosthesis and advance relatively easily.

[0068] In addition, when fixing a prosthesis to the abutment of the present invention, it is preferable to fill the space between the abutment and the prosthesis with an elastic polymer material such as medical silicone to prevent the ingress of foreign matter and further reinforce the elasticity of the abutment.

[0069] Fig. 15(a) is a perspective view of an implant abutment according to another embodiment of the present invention, and Fig. 15(b) is a plan view of Fig. 15(a) seen from directly above. Fig. 16(a) is a cross-sectional view showing a stage where a prosthesis X starts to be coupled to the upper part of the implant abutment shown in Fig. 15(a), and Fig. 16(b) is a cross-sectional view taken along lines BB and CC in Fig. 16(a). Fig. 17(a) is a cross-sectional view showing a hypothetical stage immediately before a prosthesis X is fastened to the upper part of the implant abutment shown in Fig. 15(a), and Fig. 17(b) is a cross-sectional view taken along line AA in Fig. 17(a) to show an interference (or obstruction) location that occurs when the prosthesis is coupled.

[0070] According to another embodiment of the present invention, a dental implant abutment 400 is formed such that the outer diameter of the upper end of the abutment on which a prosthesis is attached is larger than the outer diameter of the lower part thereof, and is configured to include a prosthesis fastening projection 410 protruding outward and a notch 420 dividing the upper part of the abutment into a plurality of sections.

[0071] 15(a) and 16(a), the prosthesis fastening projection 410 of the abutment 400 is configured to be inserted into the connection hole of the prosthesis X and engaged with the fastening groove portion X1 of the connection hole to be fastened. Referring to FIG. 16(b), the diameter HDB of the connection hole in the cross section taken along line BB in FIG. 16(a) is larger than the diameter HDC of the connection hole in the cross section taken along line CC. The prosthesis fastening projection 410 of the abutment 400 gradually deforms toward the notch while passing between line BB and line CC. As shown in FIG. 17(a), when it is assumed that the prosthesis fastening projection 410 of the abutment 400 reaches line CC, the outer diameters of the upper and lower end portions 412a, 412b of the prosthesis fastening projection 410 become larger than the diameter HDC of the connection hole in the cross section taken along line CC, as shown in FIG. 17(b). That is, when the prosthesis is coupled to the abutment, interference occurs between the upper and lower ends 412a, 412b of the prosthesis fastening projection 410 and the coupling hole in the cross section along the line CC, preventing entry. Therefore, during actual coupling, the prosthesis fastening projection 410 of the abutment 400 cannot reach the line CC, and as a result, the prosthesis fastening projection 410 of the abutment 400 cannot be fitted into the fastening groove portion X1 of the prosthesis and fastened.

[0072] In relation to this, FIG. 18(a) is a plan view of a modified embodiment of the prosthesis fastening projection in which additional processing has been performed to remove the interference portion shown in FIG. 17(b), and FIG. 18(b) is a cross-sectional view taken along line CC when the prosthesis fastening projection in FIG. 18(a) is inserted to the corresponding position in FIG. 17(a).

[0073] That is, unless the interference portion shown in Fig. 17(b), i.e., the upper and lower end portions 412a, 412b of the prosthesis fastening projection 410 is removed, the prosthesis fastening projection of the abutment cannot pass through the cross section taken along line CC, so as shown in Fig. 18(a), the width of the notch is widened (upper view of Fig. 18(a)) or the interference portion is horizontally removed. When the structural modification is made to the prosthesis fastening projection 410 in this way, the prosthesis fastening projections 410', 410'' can pass through the cross section taken along line CC of the coupling hole without interference, as shown in Fig. 18(b).

[0074] FIG. 19(a) is a cross-sectional view showing the prosthesis X completely fastened to the upper part of the implant abutment shown in FIG. 18(a), and FIG. 19(b) is a cross-sectional view taken along line DDD in FIG. 19(a).

[0075] That is, the prosthesis fastening projections 410', 410'' having been structurally modified as described above pass through the cross section along line CC and are then fitted into the fastening grooves of the prosthesis as shown in FIG. 19(a) for fastening. In this case, the prosthesis fastening projections 410', 410'' are elastically restored so as to be fitted into the fastening grooves of the prosthesis as shown in FIG. 19(b).

[0076] However, in this case, the width W' of the notch must be much larger than the width W of the notch in FIG. 15(a) or the upper and lower ends of the protruding fastening portion of the prosthesis must be removed, which has a limit that reduces the structural rigidity of the prosthesis fastening protrusion itself that is connected to the prosthesis.

[0077] FIG. 20(a) is a perspective view of an implant abutment according to still another embodiment of the present invention, and FIG. 20(b) is a plan view of FIG. 20(a) seen from directly above.

[0078] Referring to FIG. 20(a), a dental implant abutment 500 according to another embodiment of the present invention is configured to include a prosthesis fastening projection 510 protruding outward, and a notch 520 dividing the upper portion of the abutment into a plurality of pieces, the prosthesis fastening projection 510 being formed so that the outer diameter of the upper end of the abutment to which the prosthesis is attached is larger than the outer diameter of the lower portion thereof.

[0079] Referring to Figure 20(b), the prosthesis fastening protrusion 510 is configured such that, when viewed in horizontal cross section, the distance value from the vertical central axis C of the abutment to the outer surface of the fastening protrusion continuously decreases as it approaches the notch 520, and in particular, the distance value is greatest at the center F of the outer surface of the slice divided by the notch 520 (hereinafter referred to as the "characteristic shape").

[0080] For example, as shown in FIG. 20(b), each of the prosthesis fastening projections 510 divided into a plurality of segments by the notches 520 can have a characteristic crescent shape when viewed from directly above.

[0081] Fig. 21(a) is a cross-sectional view showing the stage where the prosthesis X starts to be joined to the upper part of the implant abutment shown in Fig. 20(a), and Fig. 21(b) is a cross-sectional view taken along lines BB and CC in Fig. 21(a). Fig. 22(a) is a cross-sectional view showing the stage just before the prosthesis X is fastened to the upper part of the implant abutment shown in Fig. 20(a), and Fig. 22(b) is a cross-sectional view taken along line CC in Fig. 22(a).

[0082] Referring to FIG. 21(a), the prosthesis X has a predetermined length of a coupling hole having a circular cross section, and a fastening groove x1 corresponding to the prosthesis fastening protrusion 510 is formed at the top of the coupling hole. When the prosthesis X is fitted to the top of the dental implant abutment 500, as shown in FIG. 22(a), when the prosthesis fastening protrusion 510 reaches the cross section of the coupling hole along the CC line, as shown in FIG. 22(b), the prosthesis fastening protrusion divided into a plurality of pieces is deformed toward the notch 520 side. As a result, the entire deformed prosthesis fastening protrusion has a shape corresponding to the coupling hole of the prosthesis. In this case, no interference occurs between the prosthesis fastening protrusion and the coupling hole of the prosthesis, and therefore, unlike the previous embodiment, there is no need to make a separate structural change such as removing the interference portion or increasing the width of the abutment notch. In other words, it has an advantage that not only the bonding strength with the prosthesis is ensured, but also the structural rigidity of the prosthesis fastening projection itself, which supports the bite force applied to the prosthesis, is increased.

[0083] FIG. 23(a) is a cross-sectional view showing the prosthesis X completely fastened to the upper part of the implant abutment shown in FIG. 20(a), and FIG. 23(b) is a cross-sectional view taken along line DD in FIG. 23(a).

[0084] Referring to Fig. 23(a), the prosthesis fastening protrusion 510 passes through the cross section of line CC and is engaged and fastened in the fastening groove of the prosthesis as shown in Fig. 23(a), but in this case, as shown in Fig. 23(b), the prosthesis fastening protrusion 510 is elastically restored to be engaged with the fastening groove of the prosthesis. In particular, the prosthesis fastening protrusion 510, which is configured to protrude outward with non-uniform numerical values ​​depending on the position on the outer surface of the piece divided into a plurality of pieces by the notches formed in the upper part of the abutment, is elastically restored after deformation, and is inserted into the coupling hole of the prosthesis to be engaged and fastened with the corresponding shape of the fastening groove of the prosthesis, thereby making it possible to prevent the prosthesis from rotating and to identify the fastening position.

[0085] That is, as shown in FIG. 23(b), when the prosthesis fastening protrusion 510 is elastically restored and engages with the fastening groove of the prosthesis to be fastened, the entire elastically restored prosthesis fastening protrusion 510 has, for example, an elliptical shape. Therefore, compared to an existing circular structure, it is easy to identify the fastening position during fastening, and the function of preventing rotation of the prosthesis can be achieved even after fastening.

[0086] Although the present invention has been described in detail with reference to the drawings and in connection with specific embodiments, the present invention is not limited to such specific structures. Those skilled in the art can modify or change the present invention in various ways without departing from the technical idea and scope of the present invention as described in the following claims. However, it should be made clear in advance that any such merely design-based material modifications or changes in the structure are clearly within the scope of the present invention.

Claims

1. 1. An abutment for a dental implant, comprising: a prosthesis fastening protrusion that protrudes outward and is formed so that the outer diameter of the upper end of the upper portion of the abutment to which the prosthesis is attached is larger than that of the lower portion thereof; a notch that divides the upper portion of the abutment into a plurality of segments; The prosthesis fastening protrusion has a shape in which the distance value from the vertical center axis (C) of the abutment to the outer surface of the fastening protrusion is not uniform depending on the position when viewed in horizontal cross section.

2. 2. The abutment for a dental implant according to claim 1, wherein the notch is formed in a continuous manner over a certain distance starting from an upper end surface of the abutment toward the lower side, and is formed in a spiral or oblique shape over a certain distance.

3. 2. The dental implant abutment according to claim 1, wherein a width of the lower cutout portion of the cutout portion is smaller than a width of the upper cutout portion of the cutout portion.

4. 2. The abutment for a dental implant according to claim 1, wherein the spiral or oblique notch is formed such that the cutting direction from the top to the bottom of the cutting section is the same as the rotation direction for fastening a fixing screw that fastens the abutment to a fixture.

5. 2. The dental implant abutment according to claim 1, wherein the abutment is fastened to the fixture by a fixing screw, the fixing screw including: a threaded portion having a predetermined vertical length and having a thread formed on an outer peripheral surface thereof; a head portion formed on the upper side of the threaded portion and having a coupling groove formed on an upper end surface thereof into which a driver is inserted; and a body portion connecting the threaded portion and the head and having a helical-shaped cutout portion formed in a certain length in the longitudinal direction thereof, the helical cutout portion penetrating horizontally through a vertical central axis of the body portion and being formed in a certain length in the longitudinal direction of the vertical central axis of the body portion, so as to equally divide a cross section perpendicular to the vertical central axis.

6. 2. The dental implant abutment as described in claim 1, characterized in that at least one end of the lower portion of the abutment that is inserted into the axial hole of the fixture is closed, and a plurality of slot cutouts extending from the outer diameter to the inner diameter are formed at regular intervals along the circumference.

7. The dental implant abutment according to claim 6, wherein the slot cutout is formed in a diagonal line, a vertical line or a horizontal line.

8. 6. The abutment for dental implant according to claim 5, wherein the head of the fixing screw further comprises a screw loosening prevention protrusion at a certain position on the outer circumferential surface, and when the fixing screw is fastened, the screw loosening prevention protrusion is fitted into a spiral or oblique notch formed on the upper part of the abutment, thereby preventing the fixing screw from loosening.

9. The dental implant abutment according to claim 2 , wherein the flat surface is formed as an inclined surface.

10. 2. The dental implant abutment of claim 1, wherein the inclination of the outer surface of the abutment changes at least twice between the upper point of the maximum diameter portion (A) of the abutment where the margin portion of the prosthesis is located and directly below the prosthesis fastening protrusion.

11. 2. The abutment for dental implant according to claim 1, wherein the prosthesis fastening protrusion is further formed with a prosthesis fastening position recess that is recessed inward, thereby identifying the fastening position of the prosthesis when the prosthesis is attached and preventing rotation of the prosthesis.

12. 2. The abutment for dental implant according to claim 1, wherein a certain section directly below the prosthesis fastening protrusion is formed with a slope less than the slope of an outer surface of a portion corresponding to the lower 1 / 3 of the section between the maximum diameter portion of the abutment where the margin portion of the prosthesis is located and the upper end of the abutment, or has a slope of zero.

13. 2. The abutment for dental implants according to claim 1, characterized in that the inner diameter of the upper side of the through hole penetrating from the upper end surface to the lower end surface of the abutment is maintained constant for a certain section, and then has a larger inner diameter below that.

14. 2. The dental implant abutment according to claim 1, wherein the prosthesis fastening protrusion is formed asymmetrically (220c') above and below with respect to the maximum protuberance point of the prosthesis fastening protrusion when viewed in vertical cross section.

15. 2. The abutment for dental implant according to claim 1, wherein the prosthesis fastening protrusion has a shape in which, when viewed in horizontal cross section, the distance value from the vertical central axis (C) of the abutment to the outer surface of the fastening protrusion continuously decreases as it approaches the notch, and the distance value is greatest at the center (F) of the outer surface of the section divided by the notch.

16. 2. The dental implant abutment according to claim 1, wherein the prosthesis has a connecting hole having a circular cross section formed therein over a predetermined length, and a fastening groove portion corresponding to the prosthesis fastening protrusion is formed at an upper portion of the connecting hole, and when the prosthesis is fitted onto the upper portion of the dental implant abutment, the prosthesis fastening protrusion divided into a plurality of pieces is deformed toward the cutout portion, so that the entire deformed prosthesis fastening protrusion has a shape corresponding to the connecting hole of the prosthesis.

17. 17. The abutment for dental implant according to claim 16, characterized in that the prosthesis fastening protrusion, which is configured to protrude outward by non-uniform numerical values ​​depending on the position from the center of the inner surface of the piece divided into several pieces by the notch formed on the upper part of the abutment, is deformed and then elastically restored, and is fastened by engaging with the corresponding shape of the fastening groove of the prosthesis, thereby preventing rotation of the prosthesis and identifying the fastening position.

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