Dental implant abutment with occlusal force buffering function

Abstract

The present invention relates to an abutment for dental implant, which performs a function of buffering occlusal force transmitted through a prosthesis, and is elastically combined with the prosthesis, rather than being combined through an adhesive, and more particularly to an abutment for dental implant, which is formed with a prosthesis fastening protrusion protruding outward with a larger outer diameter than a straight lower portion on an outer side surface of an upper portion of the abutment on which the prosthesis is installed, and a cut portion, which divides the upper portion of the abutment into a plurality of slices, is formed continuously with a certain interval from an upper end surface of the abutment toward a lower side, and the certain interval is formed in a spiral shape or a diagonal line shape.

Description

TECHNICAL FIELD

[0001] The present invention relates to an abutment for a dental implant, which performs a function of buffering occlusal force transmitted through a prosthesis, and is elastically combined with the prosthesis, rather than through an adhesive, and more particularly to an abutment for a dental implant, which is formed with a prosthesis fastening protrusion protruding outward with a larger outer diameter than a straight lower portion on an upper portion outer side surface of the abutment on which the prosthesis is mounted, and a cut portion, which divides the upper portion of the abutment into a plurality of slices, is formed at intervals, continuously connected from an upper end surface of the abutment toward a lower side, and is formed in a spiral or diagonal line shape, so that the prosthesis can be easily combined on the upper portion of the abutment without an adhesive through a simple operation using elastic restoring force of the plurality of slices, and a sufficient buffering function can be obtained through the cut portion structure formed in the spiral or diagonal line shape, whereby the loosening phenomenon and breakage of a fixing screw are greatly reduced by effectively buffering occlusal force continuously applied to the abutment, the prosthesis is combined without using an adhesive, so that fastening and detachment are easy, and the possibility of gum disease due to excess adhesive remaining on the gum side is reduced. BACKGROUND

[0002] Generally, a dental implant, which is a substitute for a lost natural tooth, refers to a natural tooth substitute that a fixture is implanted in an alveolar bone, is fused with the alveolar bone for a prescribed time, and then a prosthesis such as an abutment and an artificial tooth is fixed thereon, thereby restoring the original function of the tooth.

[0003] The implant for an artificial tooth surgery includes a fixture having a thread formed on an outer circumferential surface so as to be implantable in an alveolar bone, and a shaft hole formed along a vertical central axis, an abutment having a lower portion inserted into the shaft hole of the fixture, and a prosthesis attached to an upper portion thereof, and a fixing screw that fastens and firmly fixes the fixture and the abutment, the abutment having a screw insertion hole formed along the vertical central axis. According to circumstances, the abutment and the fixing screw are also formed in an integrated form.

[0004] In other words, the abutment is fastened and fixed to the fixture by a separate fixing screw or a fixing screw formed in an integrated form in the lower portion, the conventional separate fixing screw is composed of a head, a threaded portion, and a main body portion connecting the head and the threaded portion, and a polygonal groove for insertion of a jig is formed on an upper end surface of the head, and a thread is formed on a lower portion of the main body portion, thereby forming the threaded portion.

[0005] In addition, the abutment, which is separately formed from the fixation screw fastened to the fixture, is formed with a screw insertion shaft hole passing through from the upper end to the lower end, and the outer side surface of the abutment is composed of a portion inserted into the shaft hole of the fixture and a portion to which the prosthesis is attached, and the inner side surface portion of the screw insertion shaft hole is formed with a fixation screw downward movement preventing step portion D in contact with the head bottom surface C of the fixation screw.

[0006] In the type in which the abutment and the fixation screw are separated, when the fixation screw is fastened, the surgeon inserts the fixation screw into the shaft hole of the fixture in such a manner that the fixation screw passes through the insertion hole of the abutment, with the abutment placed in the state of being positioned in the shaft hole of the fixture. Then, the fixation screw is rotated by inserting a screwdriver or the like into the polygonal groove formed in the upper end surface of the head of the fixation screw, so that the head bottom surface C of the fixation screw is formed in the inner side surface of the screw insertion shaft hole of the abutment and comes into contact with the fixation screw downward movement preventing step portion D, and the head of the fixation screw presses the abutment toward the fixture side, so that a strong tension is applied between the head and the threaded portion of the fixation screw in the state in which the threads formed in the outer side surface of the fixation screw are fastened to the threads formed in the inner side surface of the shaft hole of the fixture, as a result of which the abutment is firmly fixed to the fixture by the fixation screw, and the prosthesis is attached to the abutment thus firmly fixed by using an adhesive.

[0007] However, as described above, in the conventional implant in which the fastening force of the fixture and the abutment is obtained by forcibly tightening the screw, and the prosthesis is fixed by using an adhesive, the conventional fixation screw is forcibly tightened after fastening the fixation screw [i.e., a bolt] to the shaft hole [i.e., a nut] of the fixture, so that the fixation screw obtains a tension in the lengthwise direction, as a result of which the upper surface of the threads of the fixation screw strongly adheres to the lower surface of the threads of the shaft hole of the fixture, so that a considerable fastening force is exerted, but there are the following fundamental problems or limitations.

[0008] For example, the problem is that, when the fixation screw is allowed to firmly fix the abutment to the fixture by forcibly tightening the conventional fixation screw, the tension generated between the head and the threaded portion of the fixation screw is called N, and when the tension generated due to the tightening of the fixation screw is applied to a degree weaker than N, a desired sufficient tension cannot be obtained, so that a firm fastening force cannot be obtained.

[0009] In other words, when a tension weaker than N is applied between the head and the threaded portion of the fixation screw by weak tightening, the force with which the upper surface of the threads of the fixation screw adheres to the lower surface of the threads of the inner side surface of the shaft hole of the fixture is also weakened, so that the fastening force between the threads is weakened. In this case, the fixation screw is gradually loosened even under a low rotational force generated by a continuous vibration or impact caused by the occlusal force applied to the prosthesis, so that a phenomenon in which the abutment attached to the fixture is shaken often occurs.

[0010] In addition, the problem is that, in order to prevent the phenomenon described above and keep the fixing screw from loosening, when a tensile force stronger than N is applied and it is tightened too much, the fixing screw material will accumulate fatigue when permanent deformation occurs. When the fixing screw is continuously subjected to other impacts such as seizing forces, the fixing screw is more likely to break.

[0011] In addition, the problem with the previous base was that when a biting force was continuously applied to the base in various directions, the applied stress was transmitted to the fixing screw in an unbuffered state and continued to accumulate between the head and thread of the fixing screw, eventually leading to the loosening and breakage of the fixing screw.

[0012] As an example, such as Figure 8 As shown, the problem is that when a lateral biting force is applied to the base, a rotational force is generated on the base with the part where the base and the fixing body are in close contact as the reference point. Due to this rotational force, a force is generated that pushes the fixing screw upward, which applies a force that makes the base press down strongly. This stress accumulates and causes the fixing screw to break.

[0013] In the internal type in which the abutment is inserted into the shaft hole of the fixture and fastened, generally, after the abutment and the fixture are fastened, due to the occlusal force continuously applied without a buffering action, the position of the abutment sinks downward over time compared to the vertical position in the shaft hole of the abutment when the fixture screw is initially tightened. In this case, a gap is generated between the head bottom surface C of the fixture screw and the abutment downward movement prevention stepped portion D formed on the inner side surface of the shaft hole of the abutment, so that the head of the fixture screw cannot perform the function of pressing the abutment downward to fix it to the fixture. Since no tension is generated between the head and the threaded portion of the fixture screw, the upper surface of the thread formed on the fixture screw does not strongly come into close contact with the lower surface of the thread formed on the inner side surface of the shaft hole of the fixture. In this state, the abutment moves in the shaft hole of the fixture, and further, whenever the occlusal force is applied from various directions, stress cannot be uniformly dispersed and concentrated in a certain place, which results in problems such as alveolar bone damage, abutment neck breakage, fixture breakage, fixture screw breakage, and fixture screw loosening. Generally, in order to prevent problems caused by such sinking, the existing abutment has a problem in that only a complicated method of re-tightening the fixture screw so that the head of the fixture screw strongly contacts one side of the abutment after using it for a certain time in a form in which the occlusal force is applied to the abutment after initially fastening the fixture screw can be used. In addition, when the head of the fixture screw contacts one side of the abutment and strongly adheres to the fixture side, a lateral pressure is continuously applied to the prosthesis, and thus tension and lateral force are transmitted to the fixture screw through the abutment, which results in loosening or breakage of the fixture screw.

[0014] In addition, there is a problem in that, as described above, when the fixture screw is broken due to various reasons, a large amount of time and effort is required to remove the broken piece of the fixture screw remaining in the state of being fastened to the nut portion of the inner side surface of the shaft hole of the fixture, and in some cases, the broken piece of the fixture screw cannot be completely removed.

[0015] As described above, the existing abutment without the occlusal force buffering function has many problems.

[0016] In addition, when the prosthesis is fixed to the abutment using the adhesive, the adhesive is often separated due to the continuous biting force, and the prosthesis is often separated from the abutment and detached. When the prosthesis fixed to the abutment is removed due to some problems, a lot of time and pain are required.

[0017] In addition, when the prosthesis is fixed to the abutment using the adhesive, the adhesive is often separated due to the continuous biting force, and the prosthesis is often separated from the abutment and detached. When the prosthesis fixed to the abutment is removed due to some problems, a lot of time and pain are required. SUMMARY

[0018] The present application is to provide an abutment for a dental implant, which has a cut portion for dividing the upper portion of the abutment into a plurality of slices from the upper end surface of the abutment combined with a prosthesis to the lower portion in a certain interval, and in order to improve the elasticity of the slice affecting the biting force buffering function, the certain interval of the cut portion for dividing the upper portion of the abutment into a plurality of slices is formed in a spiral or diagonal line shape, thereby lengthening the length of the slice and making the slice have a spiral shape, thereby maximizing the elastic restoring force, and as a result, when the biting force is applied, the buffering function is provided with a strong elastic force to improve the problems of the conventional implant due to the absence of the biting force buffering function, thereby prolonging the inconvenient point and the life of the implant.

[0019] Another object of the present application is to provide an abutment for a dental implant, which has a cut portion for dividing the upper portion of the abutment into a plurality of slices, and the cut portion width of the lower portion is formed to be significantly smaller than the cut portion width of the upper portion, thereby enhancing the strength by making the volume of the slice large, and the cut portion is formed in a spiral or diagonal line shape, thereby forming an inclined surface, and when the slice is deformed due to the biting force, by the cut portion width of the lower portion being significantly reduced and the inclined surface formed by the spiral cut portion, compared to the vertically formed cut portion, even in the case of small deformation, the adjacent slice can be quickly contacted, thereby making the applied biting force well dispersed to the adjacent slice.

[0020] Generally, in the present invention, after the prosthesis is fixed to the abutment by separating the abutment upper portion into multiple pieces by the cutaway portion, in order to exert the occlusal force buffering function as described above, when the occlusal force is applied to the pieces separated into multiple pieces by the cutaway portion formed in the abutment upper portion, it is necessary to buffer the occlusal force by elastic movement and to recover again, so that even after the prosthesis is fixed to the abutment, any solidified substance cannot be filled in the space between the pieces. Therefore, when the adhesive filled between the pieces is used as a method for fixing the prosthesis to the abutment, the adhesive is solidified after being filled between the pieces, so that the pieces cannot be elastically moved, which results in substantially causing the buffering function to be lost. Another object of the present invention is to provide an abutment for dental implants having an occlusal force buffering function, in order to solve this problem, in order to elastically combine the prosthesis with the abutment, a prosthesis fastening connection protrusion having a diameter greater than that of the straight lower portion is provided in the upper portion of the abutment divided into multiple pieces, so that when the prosthesis is inserted and combined onto the upper portion of the abutment for dental implants, the multiple pieces enter the combination hole of the prosthesis while being elastically deformed inwardly and then recovering to the original state, the prosthesis fastening connection protrusion of the abutment upper portion is engaged with and fastened to the corresponding fastening connection groove portion in the combination hole of the prosthesis, so that by the elastic recovery force of the multiple pieces, the prosthesis fastening connection protrusion can be simply and firmly combined to the corresponding fastening connection groove portion of the prosthesis without adding an adhesive.

[0021] Another object of the present invention is to provide an abutment for dental implants having an occlusal force buffering function, in which an insertion slot cutaway portion in the shape of a spiral, an oblique line, or a vertical line, which is sealed at the upper end and the lower end at certain intervals along the circumference, is formed at the lower portion of the abutment inserted into the fixation body shaft hole, so that the independent multiple faces formed along the circumference by the insertion slot cutaway portion are deformed within an elastic range and are in close contact with the inclined face of the inner side face of the fixation body shaft hole, at this time, the elastic rebound force generated by the faces deformed within the elastic range and in close contact generates a force pushing the abutment upward, as a result of which a force continuously pushing the fixation screw upward, which comes into contact with the fixation screw lower movement step portion D of the abutment, is generated, so that the threaded upper face 2a of the fixation screw is strongly in close contact with the threaded lower face 3a formed in the inner side face of the fixation body shaft hole, thereby preventing the fixation screw from being loosened, and the fixation screw can be recovered after being elastically deformed even when the occlusal force is applied.

[0022] Yet another object of the present application is to provide an abutment for a dental implant with a fixing screw individually configured, which bisects a cross section at a right angle to a vertical center axis of a main body by horizontally penetrating the vertical center axis of the fixing screw at an upper or lower portion of a thread of the fixing screw, and which enables the fixing screw itself to have sufficient tension, elastic restoring force, and cushioning function by having a helical cutout of a certain length in the upper and lower portions, thereby not only maintaining a firm fastening force for a long time but also effectively cushioning occlusal force continuously applied from the side or each direction, thereby preventing the fixing screw from being broken due to stress accumulation or concentration.

[0023] In addition, an object of the present application is to easily remove a broken piece of the fixing screw remaining at a nut portion of an inner surface of the fixing body shaft hole by inserting a flat screwdriver into the flat cutout exposed to a broken cross section and rotating the flat screwdriver even when the fixing screw is broken.

[0024] In addition, another object of the present application is that, since the upper surface 12a of the thread of the fixing screw and the lower surface 3a of the thread formed at an inner side of the fixing body shaft hole are strongly fastened and connected by elastic force of the helical cutout between the head of the fixing screw and the threaded portion, there is no cold pressure welding phenomenon, and thus the remaining portion of the fixing screw when the fixing screw is broken can be easily removed.

[0025] In addition, another object of the present application is that the cutout of the upper portion of the threaded portion of the fixing screw forms a helix of a certain interval in a helical form and has very strong elastic restoring force, and when the abutment and the fixing body are fastened and connected, the helical interval is deformed within an elastic range and strongly combined, and even if the internal type abutment has a sinking phenomenon in which the abutment moves downward due to continuous occlusal force after initial fastening and connection, the helical interval is elastically deformed even without a process of retightening the fixing screw, thereby allowing the abutment and the fixing body to be closely adhered with a force of a certain level or more.

[0026] To achieve the above objects, one embodiment of a dental implant abutment having an occlusal force cushioning function according to the present application includes a prosthesis fastening protrusion protruding outward such that an outer diameter of an upper end portion of an upper portion of the abutment on which a prosthesis is mounted is formed to have a larger outer diameter than that of a portion directly below the upper end portion, and a cutout that divides the upper portion of the abutment into a plurality of slices, the cutout being continuously formed with a certain interval from an upper end surface of the abutment toward a lower side and forming the certain interval in a helical or diagonal line form.

[0027] According to the present application, a prosthesis can be combined on the upper portion of an abutment without an adhesive through a simple operation, a firm fastening force is maintained for a long time, and a clenching force continuously applied from the side or each direction is effectively buffered to prevent loosening of a fixing screw and breakage due to stress accumulation or concentration, and prevent a phenomenon of cold welding of an insertion portion of an abutment in a fixing body shaft hole, can be easily removed when the abutment needs to be separated from the fixing body, and when the fixing screw is broken, a screwdriver can be inserted into a cut portion exposed in a broken section to be rotated, so that the broken piece of the fixing screw remaining in the nut portion of the fixing body shaft hole can be easily removed. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1a is a perspective view of a fixing screw according to an embodiment of the present application.

[0029] Figure 1b is a cross-sectional view of A-A of Figure 1a and a perspective view of a broken section thereof.

[0030] Figure 2a is a perspective view of an abutment for an implant according to an embodiment of the present application.

[0031] Figure 2b is a perspective view of an abutment for an implant according to another embodiment of the present application.

[0032] Figure 3a is a cross-sectional view showing a state in which a fixing screw of Figure 1a is combined with an abutment for an implant of Figure 2a according to an embodiment of the present application.

[0033] Figure 3b is a conceptual view showing an effect of a fixing screw on an abutment for an implant in a combined state of Figure 3a .

[0034] Figure 4a is a perspective view of an abutment for an implant according to still another embodiment of the present application.

[0035] Figure 4b is a perspective view of an abutment for an implant according to still another embodiment of the present application.

[0036] Figure 5 a is a cross-sectional view showing a fixing screw according to still another embodiment of the present application, Figure 5 b is a conceptual view showing an effect of the fixing screw shown in Figure 5 a.

[0037] Figure 6 is a perspective view of a fixing screw according to another embodiment of the present application.

[0038] Figure 7 is a perspective view of a prosthesis X combined to the upper portion of an abutment without an adhesive according to the present application.

[0039] Figure 8 is a sectional view of a modified embodiment of the abutment outer side surface inclination variation according to another embodiment of the present application.

[0040] Figure 9 is a perspective view of a modified embodiment of the prosthesis fastening connection protrusion according to another embodiment of the present application.

[0041] Figure 10 is a sectional view of a modified embodiment of the abutment upper portion according to another embodiment of the present application.

[0042] Figure 11 is a sectional view of an implant abutment according to another embodiment of the present application.

[0043] Figure 12 is a sectional view of a modified embodiment of the prosthesis fastening connection protrusion according to another embodiment of the present application.

[0044] Figure 13 is a reference diagram for explaining an effect obtainable when performing surgery on the abutment shown in the modified embodiment of Figure 12 .

[0045] Figure 14 is a sectional view showing the force pushing the fixing screw upward by the rotational force generated when a lateral occlusal force is applied to the abutment in the related art. DETAILED DESCRIPTION

[0046] Hereinafter, preferred embodiments of the present application will be described in greater detail with reference to the accompanying drawings.

[0047] Figure 1a is a perspective view of a fixing screw according to one embodiment of the present application, Figure 1b is a sectional view taken along line A-A of Figure 1a and a perspective view of the section thereof. Figure 2a is a perspective view of an implant abutment according to one embodiment of the present application, Figure 2b is a perspective view of an implant abutment according to another embodiment of the present application.

[0048] Referring to Figure 2a , in the dental implant abutment 200 of the present application, the abutment upper portion outer side surface on which the prosthesis is mounted maintains a tapering angle in which the outer diameter decreases from the portion where the prosthesis edge portion is located toward the upper portion, an outer diameter larger than that of the straight lower portion is formed at the portion just below the upper end surface, and a prosthesis fastening connection protrusion 210 protruding outward from the tapering surface is formed. In addition, as shown in Figure 2a andFigure 2b As shown, the cutaway portions 220, 220' that divide the upper portion of the abutment into a plurality of pieces are formed at intervals from the upper end surface of the abutment to the lower side. Preferably, the cutaway portions 220, 220' are formed at least twice in the upper portion of the abutment, and the upper portion of the abutment can be divided into at least two pieces. For reference, Figure 2a As shown, the upper portion of the abutment is divided into four pieces by four cutaway portions, Figure 2b As shown, the upper portion of the abutment is divided into two pieces by two cutaway portions.

[0049] As described above, the upper portion of the abutment is divided into a plurality of pieces by the cutaway portions, so that when the dental implant abutment according to the present application is combined with the prosthesis, the plurality of pieces are elastically deformed inward while entering the coupling hole of the prosthesis, and when the coupling hole of the prosthesis X is engaged with the corresponding fastening connection groove portion X1 and is fastened, the prosthesis fastening connection protrusion 210 is firmly coupled to the corresponding fastening connection groove portion X1 by the elastic restoring force of the plurality of pieces. According to the present application, as Figure 7 As shown, the prosthesis X is coupled to the upper portion of the abutment 200 without using an adhesive by a simple operation.

[0050] Preferably, as shown in Figure 2b As shown, a flat portion 250 is formed. This flat portion 250 specifies the mounting direction of the prosthesis when the prosthesis is fixed, and performs the function of preventing the prosthesis from rotating after mounting. Preferably, the flat portion can also be formed as an inclined surface having a taper angle that is the same as or greater than the taper angle of the abutment.

[0051] More preferably, as shown in Figure 2a and Figure 2b As shown, the cutaway portions 220, 230 are formed at intervals from the upper end surface of the abutment to the lower side, and the intervals are formed in a spiral or diagonal line shape. Such a spiral or diagonal line shape cutaway portion is for further increasing the elastic deformation force and the elastic restoring force of the upper portion of the abutment, while supplementing the occlusion force buffering function and the fixing screw anti-loosening function of the abutment itself.

[0052] In other words, the cutaway portions 220, 230 can buffer the occlusion force by deforming the independent plurality of surfaces formed along the circumference within the elastic range. In particular, the independent plurality of surfaces formed along the circumference continuously deform and restore within the elastic deformation limit, thereby buffering the continuous occlusion force applied when chewing food.

[0053] In particular, preferably, the spiral or diagonal cutout formed in a certain section is formed in a cutout direction extending from the upper portion to the lower portion of the cutout section, and the cutout direction is the same as the rotation direction of the fixing screw for fastening connection of the fixing body, and the effect is that, when the occlusal force is applied to the abutment by the prosthesis, in the process of transmitting the occlusal force through the spiral cutout formed in the upper portion of the abutment, the function of applying the force to the direction in which the fixing screw is fastened to the lower portion of the fixing screw can be performed, and the effect of preventing the loosening of the fixing screw can be obtained. In particular, in the abutment formed in one body at the portion where the fixing screw and the prosthesis are combined, a greater effect of preventing the loosening of the fixing screw can be exhibited.

[0054] Figure 4a is a perspective view of an abutment for an implant according to still another embodiment of the present application, Figure 4b is a perspective view of an abutment for an implant according to still another embodiment of the present application.

[0055] Referring to Figure 4a and Figure 4b , according to still another embodiment of the present application, the dental implant abutment 300 provided in one body with the prosthesis mounting portion and the threaded portion includes a threaded portion 360 having a predetermined vertical length and formed with a thread on the outer circumferential surface, a prosthesis mounting portion 340 formed in one body at the upper portion of the threaded portion and allowing the prosthesis to be fixed, and a main body portion 350 connecting the threaded portion and the prosthesis mounting portion and formed with a spiral cutout 352 having a spiral form in a certain length in the length direction. The spiral cutout 352 penetrates the vertical center axis of the main body portion horizontally and is formed in a certain length in the length direction of the vertical center axis of the main body portion, thereby being formed in a form of bisecting the cross section at a right angle with the vertical center axis.

[0056] As described above, the outer side surface of the abutment upper portion on which the prosthesis is mounted is formed in a tapered angle in which the outer diameter is reduced as it goes upward from the portion P where the edge portion of the prosthesis is located, as shown in Figure 4a , and the outer diameter is formed to be greater than that of the portion directly below the upper end surface, and the prosthesis fastening protrusion 3110, 310' protruding outward from the tapered surface is formed. In addition, as shown in Figure 4a and Figure 4b , the cutout 320, 320' dividing the abutment upper portion into a plurality of cutouts is formed in a certain section continuously from the abutment upper end surface to the lower side, and the certain section is formed in a spiral or diagonal form. Preferably, the cutout 320, 320' is formed in at least one or more in the abutment upper portion, and the abutment upper portion can be divided into at least two or more cutouts.

[0057] As described above, the abutment having the convex portion with a larger diameter than the straight lower portion on the outer side of the upper portion is deformed toward the vertical central axis during the installation of the prosthesis, and then returns to its original shape, and is combined with the recessed portion formed on the bottom surface of the axial hole of the prosthesis, thereby enabling the combination of the abutment and the prosthesis without an adhesive. In addition, the abutment has a spiral shape or a diagonal shape in a certain range of the spiral shape or the diagonal shape rotating around the vertical central axis of the abutment, thereby buffering the occlusal force applied when chewing food.

[0058] Preferably, a portion of the circumferential surface in which the prosthesis fastening convex portion 310' is formed is formed as a flat portion 350 having a taper angle equal to or greater than the taper angle of the abutment. Such a flat portion 350 eliminates the specific installation direction of the prosthesis, and supplements the function of preventing the rotation of the prosthesis.

[0059] Referring to Figure 1a and Figure 1b The fixing screw 100 of the abutment for the dental implant according to the present application, which is separately provided, includes a threaded portion 12 having a predetermined vertical length, and formed with threads 12a and 12b on the outer circumferential surface, a head portion 20 formed on the upper side of the threaded portion, and formed with a polygonal coupling groove 22 for inserting a screwdriver on the upper end surface thereof, and a body portion 10 connecting the threaded portion 12 and the head portion 20, and formed with a helical cut portion 14 having a spiral shape in a certain length in the length direction.

[0060] Preferably, as shown in Figure 1b the helical cut portion 14 penetrates the vertical central axis of the body portion 10 horizontally, and is formed in a certain length in the length direction of the vertical central axis of the body portion 10, thereby being formed in a form of bisecting a cross section at a right angle to the vertical central axis. The helical cut portion 14 can be selectively formed in a clockwise direction or a counterclockwise direction. In addition, the helical cut portion 14 can also be selectively formed in the threaded portion 12. In addition, the body portion 10 can be extended downward of the threaded portion 12, and a helical cut portion 16 can also be additionally formed in the extended portion of the body portion 10.

[0061] In addition, preferably, the cut direction of the helical cut portion having a spiral shape formed between the head portion and the threaded portion of the fixing screw is formed in the same direction as that of the threaded portion of the fixing screw.

[0062] Referring to Figure 2a and Figure 2bThe dental implant abutment 200 of the present application is formed with a plurality of slot cut portions 240, 240' along the circumference of the lower portion of the abutment inserted into the shaft hole of the fixing body. Preferably, at least one end of the lower portion of the abutment inserted into the shaft hole of the fixing body is blocked in the abutment site, and a plurality of slot cut portions 240, 240' are formed at intervals along the circumference from the outer diameter to the inner diameter. Preferably, the slot cut portions 240, 240' can be formed in the shape of an inclined line, a perpendicular line or a horizontal line.

[0063] As the fixing screw is tightened with force, the slot cut portions 240, 240' are deformed within the elastic range by the inclined slot cut portions, and are in close contact with the inclined surface of the inner side surface of the shaft hole of the fixing body, at which time the elastic rebound force generated by the deformed and in close contact surface within the elastic range generates a force to push the abutment upward, as a result, a force to continuously push the head of the fixing screw in contact with the step portion D of the abutment below the fixing screw is generated, as a result, the upper surface of the fixing screw thread is strongly in close contact with the lower surface of the thread formed on the inner side surface of the shaft hole of the fixing body, thereby preventing the loosening phenomenon of the fixing screw.

[0064] In addition, the independent plurality of surfaces formed along the circumference are continuously deformed within the elastic deformation limit and restored, thereby buffering the continuous occlusal force applied when chewing food, and preventing the cold welding phenomenon generated by the strong close contact of the abutment with the insertion shaft hole portion of the fixing body due to such action, and always being able to be easily separated when the abutment is intended to be separated from the fixing body.

[0065] Figure 3a is a sectional view showing the state in which the fixing screw of Figure 1a is combined with the abutment of Figure 2a , Figure 3b is a conceptual view showing the effect of the fixing screw on the abutment in the combined state of Figure 3a .

[0066] Referring to Figure 3a and Figure 3b , the spiral cut portion 14 formed in the main body portion 10 of the fixing screw 100 increases the elastic deformation force and the elastic restoring force of the fixing screw itself, thereby making the fixing screw of the present application have the effect of more firmly fixing the abutment to the fixing body compared to the conventional fixing screw. In other words, the fixing screw 100 of the present application has a more powerful elastic restoring force after elastic deformation while increasing the absolute length that can be elastically deformed by means of the spiral cut portion 14, thereby being able to accommodate more fastening connection energy, i.e., a more powerful fastening connection force, as a result, can have a more powerful fastening connection force than the existing fixing screw, thereby being able to prevent the problems such as loosening of the fixing screw in advance.

[0067] The spiral cut 14 can be formed at least in a certain interval between the upper end and the lower end of the body portion 10, and preferably, the spiral cut 14 is formed at a portion of the body portion 10 where the threaded portion 12 and the head portion 10 are connected. Referring to Figure 3a and Figure 3b , the threaded portion 12 of the fixing screw 100 is engaged with the thread 3 formed on the inner side surface of the shaft hole of the fixing body 1, and if the fixing screw is further tightened, the threaded portion 12 of the fixing screw 100 is extended by a certain length within the elastic deformation limit due to the elastic force of the spiral cut 14, and by the elastic restoring force of the spiral cut 14, as indicated by an arrow in Figure 3a , the threaded portion 12 of the fixing screw is strongly pulled upward. Thus, as shown in Figure 3b , the upper surface 12a of the threaded portion of the fixing screw is closely adhered to the lower surface 3a of the thread formed in a form corresponding to the inner side surface of the shaft hole of the fixing body 1, thereby ensuring a more firm fastening force between the engaged threads, and as a result, the loosening of the fixing screw can be greatly reduced.

[0068] Preferably, the direction of formation of the spiral cut formed in a spiral form between the head portion and the threaded portion of the fixing screw is formed in the same direction as the direction of formation of the threaded portion of the fixing screw.

[0069] Preferably, as shown in Figure 5 , the spiral cut 16 can also be formed in a spiral form at a lower portion of the threaded portion 12 of the body portion 10. In this case, even when the end of the fixing screw 100 is in contact with the bottom surface of the shaft hole of the fixing body after the fixing screw is continuously tightened, the bottom surface of the shaft hole of the fixing body and the bottom surface of the fixing screw are in contact and compress the spiral cut formed in a spiral form at the lower portion of the threaded portion, thereby generating an elastic restoring force, and by this elastic restoring force, the threaded portion of the fixing screw is strongly pushed upward. Thus, as in Figure 3b , the upper surface 12a of the threaded portion of the fixing screw is closely adhered to the lower surface 3a of the thread formed in a form corresponding to the inner side surface of the shaft hole of the fixing body 1, thereby ensuring a more firm fastening force, and as a result, the loosening of the fixing screw can be greatly reduced. Preferably, the fixing screw of the present application is manufactured of a metal such as Ni-Ti alloy having excellent elasticity.

[0070] More preferably, the head portion 20 of the fixing screw 10 has a screw loosening prevention protrusion 26 at a certain portion of the outer circumferential surface, as shown in Figure 1a , for example, when the implant abutment 200 of FIG. 2 is fastened and connected to the fixing body by the fixing screw 10 of Figure 1a , the screw loosening prevention protrusion 26 is engaged and inserted into the spiral or diagonal cut 230 formed at the upper portion of the abutment, thereby complementarily preventing the loosening of the fixing screw.

[0071] As described above, if the fixing screw 100 according to the present application is fastened only within the elastic deformation limit, a greater elastic force and elastic restoring force than that of the conventional fixing screw can be ensured through the helical cutouts 14, 16, and thus, the force to strongly adhere and press the screw thread upper surface 12a of the fixing screw to the screw thread lower surface 3a formed on the inner side surface of the fixing body shaft hole can be more strongly and continuously maintained, which results in the advantage that the fastening force to fasten the abutment 15 to the fixing body 1 does not decrease even after a long period of time.

[0072] Referring to Figure 1a and Figure 5 , the helical cutouts 14, 16 formed on the main body 10 of the fixing screw can perform a stress buffering action by their own structural characteristics and elastic restoring force. In other words, even if various lateral pressures in various directions are applied to the abutment by the occlusal force or the like, and a force to laterally push the fixing screw or to upwardly lift the head of the fixing screw is generated, the helical cutout structure itself can buffer such a force, and as a result, the stress applied from the lateral or upper side does not accumulate to the fixing screw itself, and thus, the possibility of the breakage of the fixing screw is significantly reduced.

[0073] In addition, the elastic restoring action of the helical cutouts according to the present application can solve the conventional problem of the internal type in which the abutment lower portion is inserted and fastened to the inside of the shaft hole of the fixing body. In other words, as mentioned before, even after the fixing screw is initially fastened with a strong fastening force, a sinking phenomenon in which the abutment is lowered downward can occur as time passes, and due to such a sinking phenomenon, even if the abutment is moved to a position lower than the initially fastened position, the head of the upper end of the fixing screw is also pulled downward by the elastic restoring action of the helical cutouts, thereby having a function to maintain the strong fastening force constant.

[0074] On the other hand, even if the fixing screw is broken due to various reasons, the breakage occurs at the helical cutout formation site of the relatively weak point, and in this case, as shown in Figure 1b , the helical cutout at the broken cross section through the vertical central axis is exposed in a straight line shape. Thus, if a straight screwdriver is inserted into the straight cutout and rotated, the broken piece of the fixing screw remaining on the inner surface of the fixing body shaft hole can be easily removed.

[0075] Figure 6 is a perspective view of a fixing screw according to another embodiment of the present application. Referring to Figure 6A helical cut portion in a helical form is formed in the lower portion of the threaded portion of the fixing screw, a protrusion portion in a linear, cross or polygonal form is formed in the lower end surface of the fixing screw, and a groove corresponding to the protrusion portion is formed in the lower end surface of the fixing body hole, so that the fastening and rotating position of the fixing screw can be specified, and the function of preventing the fixing screw from loosening can be additionally performed.

[0076] In other words, when the fixing screw is tightened, the protrusion portion of the lower end surface of the fixing screw comes into contact with the upper end surface first, rather than the lowermost end surface in which the corresponding groove is formed in the lower end surface of the fixing body hole, and when the fixing screw is continuously tightened in this state, the helical cut portion in a helical form of the lower portion of the threaded portion of the fixing screw rotates with compression, and the protrusion portion of the lower end surface of the fixing screw is combined to the groove of the lower end surface of the fixing body hole at the position where the protrusion portion of the lower end surface of the fixing screw coincides with the corresponding groove formed in the lower end surface of the fixing body hole, due to the elastic restoring force of the helical cut portion in a helical form of the lower portion of the threaded portion of the fixing screw, and in order to release the combination, a horizontal rotating force of a certain level or more must be directly applied to the fixing screw, so that the function of preventing loosening can be performed, so that the daily occlusal force cannot cause the loosening phenomenon of the fixing screw.

[0077] Figure 8 is a cross-sectional view of a modified embodiment in which the inclination of the abutment outer side surface varies according to yet another embodiment of the present application. Referring to Figure 8 The inclination of the abutment outer side surface varies at least twice between an upper portion site A [preferably, an upper 1.5 mm site] of the maximum diameter portion of the abutment where the prosthesis edge is located and a directly lower portion site B of the prosthesis fastening protrusion portion 210'. In other words, the abutment outer side surface can be sequentially formed in a first inclined outer side surface L1, a first vertical outer side surface L2, a second inclined outer side surface L3 and a second vertical outer side surface L4 from the upper portion site A of the maximum diameter portion of the abutment in an upward direction. As described above, the abutment outer side surface is configured to have the inclination varying at least twice or more, so that the horizontal direction thickness of the prosthesis fastening protrusion portion of the abutment upper portion can be further secured, and as a result, when the prosthesis is fastened to the prosthesis fastening protrusion portion of the abutment upper portion, the bonding strength can be reinforced or even increased. For example, when the prosthesis fastening protrusion portion of the abutment upper portion is formed at the same inclination angle from the upper portion site A of the maximum diameter portion of the abutment to the lower end, the horizontal direction thickness of the prosthesis fastening protrusion portion of the abutment upper portion is too thin, and thus the prosthesis cannot be firmly bonded or supported when the prosthesis is fastened, and problems such as prosthesis shifting or damage can occur.

[0078] Figure 9 is a perspective view of a modified embodiment of the prosthesis fastening protrusion portion according to yet another embodiment of the present application. Referring to Figure 9In the prosthesis fastening protrusion 210', an inwards recessed prosthesis fastening position recess 210a' can be additionally formed, which specifies the fastening position of the prosthesis when installing the prosthesis, in order to prevent the prosthesis from rotating. In other words, the prosthesis fastening position recess 210a' not only has the effect of specifying the accurate fastening position of the prosthesis when the surgeon performs the prosthesis surgery, but also can prevent the prosthesis from rotating due to the force applied to the prosthesis when the prosthesis surgery is completed later.

[0079] Figure 10 is a cross-sectional view of a modified embodiment of the abutment upper portion according to yet another embodiment of the present application. Referring to Figure 10 , the outer side surface inclination of the straight lower portion of the prosthesis fastening protrusion is formed at a smaller inclination than the outer side surface inclination of the lower one-third portion of the interval between the maximum diameter portion of the abutment where the edge of the prosthesis is located and the upper end of the abutment, and depending on the situation, a vertical interval with zero inclination maintaining the same diameter can also be formed. When the prosthesis is repeatedly detached from the prosthesis fastening protrusion of the abutment, there can be a problem of wear or breakage of the prosthesis portion protruding sharply inward of the prosthesis (indicated by a circle). Therefore, the inclined interval with a small inclination or the vertical interval with zero inclination is formed from the straight lower portion of the prosthesis fastening protrusion to the lower side for a certain interval, thereby enhancing the durability of the prosthesis itself corresponding to and combined with the straight lower portion of the fastening protrusion of the abutment.

[0080] Figure 11 is a cross-sectional view of an implant abutment according to yet another embodiment of the present application. Referring to Figure 11 , the through hole passing through from the upper end surface to the lower end surface of the abutment can be configured such that the inner diameter D1 of the upper side thereof maintains the same for a certain interval, and then has a larger inner diameter D2 below. According to the through hole structure as described above, by increasing the thickness of the fastening portion of the upper side of the abutment where the prosthesis fastening protrusion 220' is located, the bonding strength when fastening the prosthesis can be further enhanced. Preferably, the inner diameter D3 of the lower side of the through hole can be configured to be smaller than the inner diameter D1 of the upper side.

[0081] Figure 12 is a cross-sectional view of a modified embodiment of the prosthesis fastening protrusion according to yet another embodiment of the present application, Figure 13 is a reference diagram for explaining the effects that can be obtained when performing the abutment surgery of the modified embodiment shown in Figure 12 . Referring to Figure 12, the prosthesis fastening protrusion is configured to gradually increase in outer diameter from its upper end toward the lower side, and as a result, from a vertical cross section of the prosthesis fastening protrusion, it is configured to be formed in an asymmetric form above and below the maximum protrusion point of the prosthesis fastening protrusion, and to have a certain angle of inclination of a portion of the outer side surface 220c' of the prosthesis fastening protrusion. For example, when a portion of the outer side surface 220c' of the prosthesis fastening protrusion is formed in an inclined shape, the upper end of the inclined outer side surface 220c' is more easily inserted into and enters the coupling hole of the corresponding prosthesis, and in particular, as shown in Figure 13 FIG. 6, the implantation angle of the adjacent abutment is too large, and even in the case where the prosthesis is difficult to fasten due to interference between adjacent prostheses, the upper end of the outer side surface 220c' of the prosthesis fastening protrusion is more easily inserted into the prosthesis coupling hole with less resistance, and after insertion, when the prosthesis is pressed in the direction of the abutment, the resistance is reduced as the prosthesis protrusion fastening protrusion having a cutout portion on the inner side is deformed in the inner side direction, and the prosthesis slides along the inclined outer side surface 220c' of the prosthesis protrusion fastening protrusion, thereby being relatively easily inserted.

[0082] In addition, preferably, when the prosthesis is fixed to the abutment of the present application, a polymer material having elasticity such as medical silicone is filled between the abutment and the prosthesis, thereby preventing foreign matter from entering and further enhancing the elasticity of the abutment.

[0083] Although the present application has been described in detail above with reference to specific embodiments thereof, the present application is not limited to the specific structures described above. Those having ordinary knowledge in the art can make various modifications or changes to the present application without departing from the technical idea and the scope of the present application recited in the patent claims. However, it is intended to expressly indicate that such simple design material modifications or deformation structures obviously belong to the scope of the present application.

Claims

1. A dental implant abutment, as a dental implant abutment with occlusal force buffering function, characterized in that, include: The prosthesis fastening connection protrusion protrudes outward, causing the outer diameter of the upper part of the abutment where the prosthesis is mounted to be larger than the outer diameter of the part directly below it; and The cutting section divides the base into multiple slices. The cut sections start from the upper surface of the base and continue downwards to form a certain interval, which is then formed into a spiral shape.

2. The dental implant abutment according to claim 1, characterized in that, A flat portion is formed on a part of the circumferential surface where the prosthesis fastening connection protrusion is formed.

3. The dental implant abutment according to claim 1, characterized in that, The width of the lower part of the cut is smaller than the width of the upper part of the cut.

4. The dental implant abutment according to claim 1, characterized in that, The spiral or oblique cut extends from the upper part to the lower part of its cut section in the same direction as the rotation direction used to fasten the fixing screw responsible for fastening the base and the fixing body.

5. The dental implant abutment according to claim 1, characterized in that, The base is fastened to the fixing body by means of a fixing screw, and the fixing screw includes: a threaded part having a certain vertical length and having threads formed on its outer peripheral surface; a head formed on the upper side of the threaded part and having a groove for inserting a screwdriver formed on its upper end surface; and a main body connecting the threaded part and the head, and having a helical cut portion of a certain length in the length direction, the helical cut portion horizontally penetrating the vertical central axis of the main body and having a certain length in the length direction of the vertical central axis of the main body, thereby forming a cross section that bisects the vertical central axis.

6. The dental implant abutment according to claim 1, characterized in that, At least one end of the lower part of the base into which the fixing shaft hole is inserted is blocked, and multiple slot cutouts extending from the outer diameter to the inner diameter are formed at certain intervals along the circumference.

7. The dental implant abutment according to claim 6, characterized in that, The slot cut is made up of diagonal lines, vertical lines, or horizontal lines.

8. The dental implant abutment according to claim 5, characterized in that, The head of the fixing screw also has an anti-loosening protrusion at a certain part of its outer peripheral surface. When the fixing screw is tightened, the anti-loosening protrusion is inserted into the spiral or oblique cut portion formed on the upper part of the base, thereby preventing the fixing screw from loosening.

9. The dental implant abutment according to claim 2, characterized in that, The planar portion can be formed into an inclined surface.

10. The dental implant abutment according to claim 1, characterized in that, Between the upper part of the abutment at the maximum diameter (A) where the prosthesis edge is located and the part directly below the prosthesis fastening connection protrusion, the inclination of the outer side of the abutment changes at least twice.

11. The dental implant abutment according to claim 1, characterized in that, An inwardly recessed portion is added to the protruding part of the prosthesis fastening connection to secure the prosthesis at the fastening connection position, thereby preventing the prosthesis from rotating when it is installed.

12. The dental implant abutment according to claim 1, characterized in that, The portion directly below the protrusion of the implant fastening connection is formed with a smaller or zero inclination than the lower third of the portion of the outer surface of the abutment where the edge of the implant is located, which is the largest diameter portion of the abutment and the upper part of the abutment.

13. The dental implant abutment according to claim 1, characterized in that, The upper inner diameter of the through hole extending from the upper end face to the lower end face of the base remains consistent within a certain range, thus forming a structure with a larger inner diameter below it.

14. The dental implant abutment according to claim 1, characterized in that, When viewed from the vertical section of the prosthesis fastening connection protrusion, it is formed in an asymmetrical (220c') shape with the maximum bulge point of the prosthesis fastening connection protrusion as the reference.

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