Dental implant and dental implant assembly comprising same

Abstract

The dental implant according to the present invention comprises: an internal groove formed on the inner side of the upper end of the dental implant so as to couple an abutment for supporting a prosthesis; and an external thread part having a thread formed from the upper end to the lower end of the outer peripheral surface of the external thread part so as to be able to be implanted into an alveolar bone, the internal groove comprising: an upper inclined part which is located at the upper end inlet part of the implant, has a circular cross-section, and has an inner diameter that becomes narrower toward the lower side; a polygonal part which is formed on the lower side of the upper inclined part and has a polygonal cross-sectional shape; a circular bore part formed on the lower side of the polygonal part and having a diameter larger than the diameter of a circle circumscribing the polygon of the polygonal part; a circular vertical part formed on the lower side of the boring part; and an internal thread part which is formed on the lower side of the circular vertical part and on which an abutment coupling thread having a diameter smaller than that of a circle inscribed with the polygon of the polygonal part is formed, and the angle at which the upper inclined part of the internal groove is inclined with respect to the axis is set to be 14 DEG to 16 DEG.

Description

Technical Field

[0001] The present invention relates to a dental implant and a dental implant assembly comprising the same. Background Art

[0002] Dental implants (hereinafter referred to as "implants") inserted into alveolar bones have been used for a long time. Currently, implants commonly used are made of titanium, titanium alloy or ceramic materials with excellent biocompatibility.

[0003] Implants need to be made to not only functionally replace the role of natural teeth, but also to properly distribute the load applied to the teeth so that they can be used for a long time like natural teeth.

[0004] Implants implanted in the alveolar bone are roughly divided into external connection methods and internal connection methods according to the form of combination with the abutment. Although the external connection method has the advantage that the implant inserted into the bone is relatively strong, it has the disadvantage of causing bone absorption at the boundary due to the increased probability of bacterial inhabitation in the initial stage after implantation due to the wider gap between the implant and the abutment.

[0005] Therefore, recently, an internal connection method is mainly used, in which a connection structure including a hexagonal portion and the like is formed inside the implant by connecting the lower end of the abutment, and the upper end of the connection structure on which the abutment is placed is inclined. The internal connection method has the advantage of a high implantation success rate by minimizing the initial bone absorption by eliminating a space for bacteria to inhabit. However, due to the structural limitation of the abutment entering the interior of the implant, there is a disadvantage that the implant inserted into the bone is relatively likely to break.

[0006] Fractures are caused by fatigue. Fatigue refers to the phenomenon that when materials and structures are repeatedly stressed, the number of stress repetitions increases, causing the strength of the material or structure to decrease and eventually cause damage. Dental implants are structures used to replace lost teeth and will repeatedly receive stress from chewing movements. Therefore, fatigue fractures (commonly known as fatigue fractures) cannot be ruled out.

[0007] When chewing, not only the vertical chewing force in the axial direction acts on the implant, but also the horizontal chewing force perpendicular to the axial direction acts on the implant. The lower end of the abutment combined with the inside of the implant can periodically apply tensile stress to the internal structure of the implant, thereby causing fatigue fracture of the implant in the form of longitudinal fracture or transverse fracture.

[0008] Therefore, there is a need for an internal structure of an implant that facilitates stress dispersion in order to overcome the cause of fatigue fracture and stably use the implant for a long period of time. Summary of the invention

[0009] Problem to be solved

[0010] An object of the present invention is to provide a dental implant including an internal groove having an internal structure and a size that facilitates stress dispersion, thereby ensuring rigidity, and a dental implant assembly including the same.

[0011] Solutions to the problem

[0012] The present invention is characterized in that, in a dental implant implanted in an alveolar bone according to a rotational action relative to an axis to form an artificial tooth root, the implant comprises: an internal groove formed on the inner side of an upper end portion of the dental implant to engage with a base tooth for supporting a restoration; and an external threaded portion, a thread is formed from an upper end to a lower end of an outer peripheral surface of the external threaded portion so as to be implanted in the alveolar bone, the internal groove comprises: an upper side inclined portion located at an upper end entrance portion of the implant, the cross section of which is circular, and the inner diameter of the upper side inclined portion becomes smaller as it approaches the lower side. The narrower; a polygonal portion, formed on the lower side of the upper inclined portion, and having a polygonal cross-sectional shape; a circular boring portion, formed on the lower side of the polygonal portion, and having a diameter larger than the diameter of a circle circumscribed with the polygon of the polygonal portion; a circular vertical portion, formed on the lower side of the boring portion; and an internal threaded portion, formed below the circular vertical portion, and having a base tooth engaging thread having a diameter smaller than a circle inscribed with the polygon of the polygonal portion, the angle of inclination of the upper inclined portion of the internal groove relative to the axis is set to 14° to 16°.

[0013] In the present invention, the dental implant is characterized in that a wall thickness ratio of the circular vertical portion forming a perpendicular direction with the axis can be set to 0.15 to 0.3 compared to a maximum outer diameter of the implant.

[0014] In the present invention, the dental implant is characterized in that the inner diameter of the circular vertical portion may be set smaller than the maximum inner diameter of the upper inclined portion by 0.5 mm to 1.8 mm.

[0015] In the present invention, the dental implant is characterized in that a ratio of a depth from the uppermost end of the upper inclined portion to the lowermost end of the internal threaded portion to a depth from the uppermost end of the upper inclined portion to the lowermost end of the circular vertical portion can be set to 0.5 to 0.7.

[0016] In the present invention, the dental implant is characterized in that the depth from the uppermost end of the upper inclined portion to the lowermost end of the internal threaded portion can be set to 4 mm to 7 mm.

[0017] In the present invention, the dental implant is characterized in that the depth from the uppermost end of the upper inclined portion to the lowermost end of the circular vertical portion can be set to 3 mm to 5 mm.

[0018] In the present invention, the dental implant is characterized in that the external threaded portion may include: an external upper threaded section, which is processed to form a first thread of a first height and a first groove of a first depth by a first cutting tool from the upper end of the outer peripheral surface of the implant to a specified section below; and an external lower threaded section, which is processed to form a second thread of a second height and a second groove of a second depth toward the bottom of the external upper threaded section by a second cutting tool having a processing surface shape and a width different from that of the first cutting tool, wherein the first height of the first thread is lower than the second height of the second thread, and the first depth of the first groove is shallower than the second depth of the second groove.

[0019] In the present invention, the dental implant is characterized in that the pitch and the peak width of the thread in the outer upper thread section and the outer lower thread section can be the same.

[0020] In the present invention, the dental implant is characterized in that the first groove and the second groove may include: a first curved portion extending from an upper portion to a side portion of the groove; and a second curved portion extending from a side portion to a lower portion of the groove.

[0021] In the present invention, the dental implant is characterized in that the curvature of the first curved portion may be greater than the curvature of the second curved portion.

[0022] In the present invention, the dental implant is characterized in that the first groove and the second groove can be vertically asymmetric with respect to a virtual line which is perpendicular to the axis and passes through the width center of the groove.

[0023] In the present invention, the dental implant is characterized in that a partially cut cutting edge can be provided at the lower end of the outer peripheral surface of the implant, and the cutting edge includes a reverse helical section in the opposite direction to the helical direction of the thread and a helical section formed in the helical direction of the thread.

[0024] The present invention is characterized in that, in a dental implant assembly, it includes: a dental implant implanted in an alveolar bone according to a rotational action relative to an axis to form an artificial tooth root; and an abutment tooth combined with the dental implant and supporting a restoration, wherein a fastening screw insertion hole is formed inside the abutment tooth, the fastening screw insertion hole extending from the upper end to the lower end of the abutment tooth for inserting a fastening screw, and the dental implant includes: an internal groove formed inside the upper end of the dental implant to combine with the abutment tooth for supporting the restoration; and an external threaded portion, a thread is formed from the upper end to the lower end of the outer peripheral surface of the external threaded portion so as to be implanted in the alveolar bone, the internal groove including: an upper side An inclined portion is located at the upper entrance of the implant and has a circular cross-section, and the inner diameter of the upper inclined portion becomes narrower as it approaches the lower side; a polygonal portion is formed at the lower side of the upper inclined portion and has a polygonal cross-sectional shape; a circular boring portion is formed at the lower side of the polygonal portion and has a diameter greater than the diameter of a circle circumscribed with the polygon of the polygonal portion; a circular vertical portion is formed at the lower side of the boring portion; and an internal threaded portion is formed at the lower side of the circular vertical portion and has a thread for abutment engagement with a smaller diameter than a circle inscribed with the polygon of the polygonal portion, and the angle at which the upper inclined portion of the internal groove is inclined relative to the axis is set to 14° to 16°.

[0025] In the present invention, the dental implant assembly is characterized in that the abutment may include: an upper side portion protruding to the outside of the dental implant to allow a restoration to be attached; and a lower side portion arranged at the lower side of the upper side portion and inserted into the internal groove, and the abutment further includes a retaining portion, which is arranged at the lower end of the lower side portion and is elastically deformed when the abutment is inserted into the dental implant, and is forcibly buckled into the inner circumferential surface of the circular vertical portion, so that the abutment is temporarily fixed inside the dental implant.

[0026] In the present invention, the dental implant assembly is characterized in that the retaining portion may be provided in plural and spaced apart around the lower end of the lower side portion, or may be provided in singular and form a closed curve around the lower end of the lower side portion.

[0027] Effects of the Invention

[0028] According to one embodiment of the present invention, the inclination of the upper inclined portion of the internal groove of the implant relative to the axis is set within a specific range to increase the contact area with the abutment tooth. This is not only beneficial for dispersing stress but also prevents the thickness of the upper end of the implant from being too thin, thereby improving the strength of the implant.

[0029] Furthermore, the depth of the lowest end of the circular vertical portion of the internal groove of the implant to which external force is applied through the abutment is formed relatively deeply so as to be more than half of the entire depth of the internal groove. This increases the distance from the upper inclined portion to which external force is applied through the abutment, facilitates the dispersion of internal stress, and is beneficial for improving the strength of the implant.

[0030] Moreover, the thickness of the circular vertical portion can be made relatively larger than the maximum outer diameter of the implant, thereby facilitating improving the strength of the implant.

[0031] In addition, a first curved portion is formed at the upper corner of the groove of the external thread, and a second curved portion is formed at the lower corner. Therefore, when implanted in the alveolar bone, stress can be dispersed to prevent stress from concentrating on the corner side of the groove, thereby improving the fracture stability of the implant.

[0032] Moreover, in the groove of the external thread, the lower part of the groove is formed relatively slowly than the upper part of the groove. Therefore, when entering the alveolar bone, the implantation of the alveolar bone becomes relatively easy through the relatively slowly inclined second curved portion, thereby improving the convenience of implantation. When the entry of the alveolar bone is completed, the relatively sharply inclined first curved portion presses the alveolar bone in the groove from the top, thereby facilitating the implantation stability.

[0033] It should be understood that the effects of the present invention are not limited to the above-mentioned effects, but include all effects that can be inferred from the specific embodiments of the present invention or the structure of the invention described in the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Part (a) and Figure 1 Part (b) is a three-dimensional view and a top view of the dental implant of the present invention.

[0035] Figure 2 It is a front view of the dental implant of the present invention.

[0036] Figure 3 It is a cross-sectional perspective view of the dental implant of the present invention.

[0037] Figure 4 and Figure 5 is a cross-sectional view of a dental implant according to the present invention.

[0038] Figure 6 Part (a) is a diagram for explaining the processing method of the polygonal portion of the present invention, Figure 6 Part (b) of FIG. 1 is a diagram for comparing the case where a polygonal portion is processed without a boring portion. Figure 6 Part (c) is a diagram for comparison with a case having a boring portion.

[0039] Figure 7 It is a partial enlarged cross-sectional view of the dental implant of the present invention.

[0040] Figure 8 It is a diagram showing the structure of the inner groove of the dental implant of the present invention.

[0041] Fig. 9 The figures are for explaining how the external threaded portion of the dental implant of the present invention is processed using cutting tools of different shapes.

[0042] Fig.10 This is a partial enlarged view of the external threaded portion of the present invention.

[0043] Fig.11 It is a cross-sectional view of a dental implant assembly of the present invention.

[0044] Fig.12 It is a front view of the abutment of the present invention.

[0045] Fig.13 for Fig.11 A partial enlarged view of .

[0046] Description of Reference Numerals

[0047] 1000: Dental Implants

[0048] 100: Internal slot

[0049] 110: Upper inclined portion

[0050] 120: Polygonal part

[0051] 130: Boring Department

[0052] 140: Circular vertical part

[0053] 150: Internal thread

[0054] 200: External thread

[0055] 210: External upper thread area

[0056] 211: First thread

[0057] 212: First Ditch

[0058] 220: External lower thread section

[0059] 221: Second thread

[0060] 222: Second groove

[0061] 223: Cutting edge

[0062] 300: Abutment

[0063] 301: Fastening screw insertion hole

[0064] 310: Upper side

[0065] 320: Lower side

[0066] 321: Tapered insert

[0067] 322: Anti-rotation part

[0068] 323: Cylinder

[0069] 324: Holding Department

[0070] 400: Fastening screw

[0071] 10: Stamping tools

[0072] B1: First cutting tool

[0073] B2: Second cutting blade DETAILED DESCRIPTION

[0074] The present invention is described in detail below with reference to the accompanying drawings. The present invention can be embodied in a variety of different forms and is not limited to the embodiments described herein. In addition, in the accompanying drawings, parts not related to the description are omitted in order to accurately describe the present invention, and similar parts are given similar reference numerals throughout the specification.

[0075] Throughout the specification, when it is stated that a certain part is “connected” to another part, this includes not only the case of “direct connection” but also the case of “indirect connection” with other parts interposed therebetween.

[0076] Furthermore, when it is stated that a certain part “includes” a certain structural element, unless there is no particular description to the contrary, it means that other structural elements may also be included rather than excluding other structural elements.

[0077] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0078] Figure 1 Part (a) and Figure 1 Part (b) is a three-dimensional view and a top view of the dental implant of the present invention, respectively. Figure 2 is a front view of a dental implant according to the present invention, Figure 3 is a cross-sectional perspective view of a dental implant of the present invention, Figure 4 and Figure 5 is a cross-sectional view of a dental implant according to the present invention, Figure 6 Part (a) is a diagram for explaining the processing method of the polygonal portion of the present invention, Figure 6 Part (b) of FIG. 1 is a diagram for comparing the case where a polygonal portion is processed without a boring portion. Figure 6 Part (c) of FIG. 1 is a diagram for comparing the case of having a boring portion. Figure 7 is a partially enlarged cross-sectional view of a dental implant of the present invention, Figure 8 FIG. 2 is a diagram showing the structure of the internal groove of the dental implant of the present invention.

[0079] Reference Figures 1 to 8 The dental implant 1000 of the present invention is a structure that is implanted in the alveolar bone according to a rotational action relative to the axis CL to form an artificial tooth root. The dental implant 1000 may include: an internal groove 100 formed at the inner side of the upper end of the dental implant to be coupled with an abutment for supporting a restoration; and an external threaded portion 200 having a thread formed from the upper end to the lower end of the outer peripheral surface of the external threaded portion so as to be implanted in the alveolar bone.

[0080] The inner groove 100 of the dental implant 1000 may include an upper inclined portion 110 , a polygonal portion 120 , a boring portion 130 , a circular vertical portion 140 , and an inner threaded portion 150 in order from the upper entrance to the lower side.

[0081] The upper inclined portion 110 may be located at the upper entrance of the dental implant 1000, and may have a circular cross section, and the inner diameter of the upper inclined portion 110 may become narrower as it approaches the lower side. The upper inclined portion 110 may extend downward from the upper end of the implant 1000, and may be formed into a tapered shape in which the diameter becomes narrower as it approaches the lower side.

[0082] According to one embodiment, Figure 5 As shown, the angle θ1 at which the upper inclined portion 110 of the inner groove 100 is inclined relative to the axis CL may be set to 14° to 16°. That is, the angle θ1 at which the upper inclined portion 110 of the inner groove 100 is inclined relative to the axis CL is preferably 14° to 16°.

[0083] The upper inclined portion 110 may be located at the uppermost end of the inner groove 100 so that both the horizontal force and the vertical force of the external force applied to the abutment are transmitted to the portion where the abutment is placed. Also, the upper inclined portion 110 may form a relatively thin wall thickness in the dental implant 1000 due to its inclined shape.

[0084] The angle θ1 of the upper inclined portion 110 of the present invention relative to the axis CL can be set to be greater than 14°, which increases the contact area with the abutment compared to the past, thereby facilitating the stress dispersion, and is set to be less than 16°, thereby preventing the upper end thickness of the dental implant 1000 from being too thin. That is, it is advantageous to improve the fracture strength of the dental implant 1000.

[0085] The polygonal portion 120 may be formed at the lower side of the upper inclined portion 110, and may have a polygonal cross-sectional shape. The polygonal portion 120 may be disposed at the lower side of the upper inclined portion 110, and prevent the abutment inserted into the inner groove 100 from rotating relative to the axis CL. In the present embodiment, the polygonal portion 120 has a hexagonal shape, but is not limited thereto, and may have various shapes that can prevent the rotation of the abutment.

[0086] The boring portion 130 may be formed at the lower side of the polygonal portion 120, and may have a diameter greater than a diameter of a circle VC1 circumscribed to the polygon of the polygonal portion 120. The boring portion 130 may be disposed at the lower side of the polygonal portion 120, and may have a diameter greater than a diameter of a circumscribed circle VC1 of the polygonal portion 120. The boring portion 130 may be formed in front of the polygonal portion 120.

[0087] Reference Figure 6 , the boring portion 130 can prevent the mother material of the upper inclined portion 110 that is plastically deformed by the punching tool 10 when processing the polygonal portion 120 from gathering on the lower side of the polygonal portion 120, causing the compressive residual stress and the crack core to concentrate. That is, as the boring portion 130 is formed, the mother material of the upper inclined portion 110 falls off mainly due to the striking of the punching tool 10, or a part of it is pushed in the radially outward direction, so that the mother material can be prevented from being severely deformed and gathering on the lower side of the polygonal portion 120 to cause the crack core problem. In other words, it is preferred that the polygonal portion 120 is formed by stamping after the boring portion 130 is first processed to prevent severe plastic deformation of the mother material.

[0088] On the other hand, the boring portion 130 may include a second circular vertical portion 131 , an upper circular arc portion 132 disposed on an upper side of the second circular vertical portion 131 , and a lower circular arc portion 133 disposed on a lower side of the second circular vertical portion 131 .

[0089] like Figure 6 As shown, in the cross section of the punching tool 10 used in the processing step of the polygonal portion 120, the radius of the boring portion 130 is greater than the length from the geometric center to the corner (ultimately, this length corresponds to the radius of the circumscribed circle of the polygonal portion). That is, the diameter of the second circular vertical portion 131 can be greater than the diameter of the circumscribed circle VC1 of the polygonal portion 120.

[0090] like Figure 6 As shown in part (b) of FIG. 1 , in the past, the workpiece of the base material was plastically deformed downward by the punching tool entering from the top and was forced into the base material. As a result, the base material was severely deformed and multiple crack cores were distributed. However, Figure 6As shown in part (c) of the present invention, the punching tool is processed into a shape that cuts the processed part like a knife or scissors or the side of the processed part cannot gather at the lower side corners, thereby solving the problem. Figure 6 Please refer to part (b) of the question.

[0091] Furthermore, by providing the upper arc portion 132 and the lower arc portion 133 on the boring portion 130, the base material that has fallen off the punching tool can be prevented from being caught in the corners and unable to be removed. Furthermore, by providing the upper arc portion 132 and the lower arc portion 133 on the boring portion 130, the stress acting on the corners of the boring portion 130 is effectively dispersed during the process of strongly striking the punching tool having square corners, thereby reducing the possibility of fracture caused by residual stress.

[0092] The circular vertical portion 140 may be formed at the lower side of the boring portion 130 for temporarily fastening the abutment. The circular vertical portion 140 is disposed at the lower side of the boring portion 130 and is substantially cylindrical in shape, and can be forcibly buckled into the retaining portion of the abutment inside the implant. Thus, the abutment can be temporarily fastened to the circular vertical portion 140 even when the abutment fastening bolt is not fastened.

[0093] The internal threaded portion 150 may be formed at the lower side of the circular vertical portion 140 and may be formed with an abutment coupling bolt having a diameter smaller than the circle VC2 inscribed in the polygon of the polygonal portion 120. The internal threaded portion 150, as a portion disposed at the lower side of the circular vertical portion 140, may be threaded on the inner circumferential surface.

[0094] On the other hand, in the internal groove 100 of the dental implant 1000, the upper inclined portion 110 and the circular vertical portion 140 are parts that directly contact the abutment and transmit the external force applied to the abutment (for example, chewing force including vertical chewing force and horizontal chewing force), and are important factors for improving the strength of the dental implant 1000.

[0095] And, according to one embodiment, if Figure 8 As shown, the depth L1 from the uppermost end of the upper inclined portion 110 to the lowermost end of the circular vertical portion 140 can be set to 3 mm to 5 mm. Moreover, the ratio (L1 / L2) of the depth L2 from the uppermost end of the upper inclined portion 110 to the lowermost end of the internal threaded portion 150 to the depth L1 from the uppermost end of the upper inclined portion 110 to the lowermost end of the circular vertical portion 140 can be set to 0.5 to 0.7.

[0096] That is, preferably, the ratio (L1 / L2) of the depth L2 from the upper end of the upper inclined portion 110 to the lower end of the internal threaded portion 150 to the depth L1 from the upper end of the upper inclined portion 110 to the lower end of the circular vertical portion 140 is 0.5 to 0.7, and at the same time, the depth from the upper end of the upper inclined portion 110 to the lower end of the circular vertical portion 140 is 3 mm to 5 mm.

[0097] The circular vertical portion 140 is a portion that is fastened by a forced buckling method as the retaining portion of the abutment, and can transmit the horizontal force of the external force applied to the abutment. In this way, the bottom end depth L1 of the circular vertical portion 140 that transmits the external force is formed relatively deeply, so that it becomes more than half of the entire depth L2 of the internal groove 100, thereby increasing the distance between the upper side inclined portions 110 that transmit the external force, and facilitating the dispersion of the internal stress. In this way, the structure of the internal groove 100 that is conducive to the dispersion of stress can be conducive to improving the fatigue strength.

[0098] And, according to one embodiment, Figure 5 And such as Figure 8 As shown, the ratio (D2 / D1) of the wall thickness D2 of the circular vertical portion 140 in the direction perpendicular to the axis CL may be set to 0.15 to 0.3 compared to the maximum outer diameter D1 of the dental implant 1000. Also, the inner diameter R1 of the circular vertical portion 140 may be 0.5 mm to 1.8 mm smaller than the maximum inner diameter R2 of the upper inclined portion 110.

[0099] That is, preferably, the ratio (D2 / D1) of the wall thickness D2 of the circular vertical portion 140 in the direction perpendicular to the axis CL is 0.15 to 0.3 compared to the maximum outer diameter D1 of the dental implant 1000, and the inner diameter R1 of the circular vertical portion 140 is 0.5 mm to 1.8 mm smaller than the maximum inner diameter R2 of the upper inclined portion 110. In this way, the thickness D2 of the circular vertical portion 140 for transmitting the external force applied to the abutment, especially the horizontal force, is relatively larger than the maximum outer diameter D1 of the dental implant 1000, which can help improve the strength of the dental implant 1000.

[0100] Fig. 9 FIG. 2 is a diagram for explaining how to process the external threaded portion of the dental implant of the present invention using cutting tools of different shapes. Fig.10 This is a partial enlarged view of the external threaded portion of the present invention.

[0101] Reference Figure 1 , Figure 2 , Figure 4 and Figure 5 The external threaded portion 200 may include an external upper threaded section 210 and an external lower threaded section 220 .

[0102] Reference Fig. 9 and Fig.10 The external threaded portion 200 may include an external upper threaded section 210, which is processed to a specified section from the upper end to the lower side of the outer peripheral surface of the dental implant 1000, and a first thread 211 of a first height and a first groove 212 of a first depth are formed by a first cutting tool B1.

[0103] Furthermore, the external threaded portion 200 may include an external lower end thread section 220, which is processed toward the lower side of the external upper end thread section 210 by means of a second cutting tool B2 having a processing surface shape and width different from the first cutting tool B1 to form a second thread 221 of a second height and a second groove 222 of a second depth.

[0104] At this time, the first height of the first thread 211 may be lower than the second height of the second thread 221. Also, the first depth of the first groove 212 may be shallower than the second depth of the second groove 222.

[0105] Reference Figure 5 and Fig. 9 The dental implant 1000 of the present invention performs thread processing on the processing target surface of the implant base material by using two cutting tools B1 and B2 with different processing surface shapes in order to form two thread sections 210 and 220 with different thread groove depths (or thread peak heights) H1 and H2 on its outer peripheral surface. Among them, H1 can be the thread groove depth (or thread height) formed by the first cutting tool B1 in the outer upper thread section 210, and H2 can be the thread groove depth (or thread height) formed by the second cutting tool B2 in the outer lower thread section 220.

[0106] In the usual implant thread processing work, the implant base material is rotated while the cutting tool enters the lower end of the processing target surface of the implant, thereby moving upward along a specified predetermined movement trajectory and performing thread processing. In this case, the depth of the cutting tool entering the processing target surface of the implant base material can be adjusted to adjust the thread height.

[0107] In the dental implant 1000 of the present invention, when forming the outer lower thread section 220, the second cutting tool B2 is inserted into the implant base material to perform thread processing on the outer lower thread section 220 with a deep thread groove depth H2 (or a high peak height).

[0108] When the thread machining by the second cutting blade B2 is finished, the second cutting blade B2 is replaced by the first cutting blade B1 to perform thread machining of the outer upper thread section 210 with a shallow thread groove depth H1 (or a low peak height).

[0109] In this case, as described above, a thread non-processing section H (see FIG. 1 ) where thread processing is not performed is formed from the uppermost end of the dental implant 1000 to a predetermined depth on the lower side. Figure 2 ), therefore, the outer upper end thread processing of the dental implant 1000 by means of the first cutting blade B1 does not proceed to the uppermost portion of the dental implant 1000, but can be ended at a location spaced a specified distance from the uppermost end to the lower side of the dental implant 1000.

[0110] On the other hand, in order to machine the threads 211 and 221 having the same pitch P on the outer surface of the dental implant 1000, the machined surfaces of the second cutter B2 for machining the outer lower end thread of the dental implant 1000 and the first cutter B1 for machining the outer upper end thread should have different shapes.

[0111] If the same cutting tool is used to process the outer lower thread section 220 and the outer upper thread section 210, the peak width of the first thread 211 of the outer upper thread section 210 with a low groove depth becomes wider. Therefore, when the dental implant 1000 is implanted into the alveolar bone, a relatively large torque is required, which may make the implantation work of the dental implant 1000 difficult and may also damage the alveolar bone.

[0112] On the contrary, the first cutting tool B1 and the second cutting tool B2 for machining the outer upper thread section 210 and the outer lower thread section 220 perform thread machining work with different end machining surface shapes and widths, thereby forming the outer upper thread section 210 and the outer lower thread section 220 of the dental implant 1000. Although the peak heights of the respective threads 211 and 221 are different, the pitch P of each thread is the same, and the peak width W of each thread (refer to Figure 2 )Same thread structure.

[0113] As described above, when the crest width W of the thread is narrowed, the area of ​​the grooves 212 and 222 increases, so that an advantageous effect can be obtained even when performing a sandblasting process or a coating process.

[0114] Reference Figure 4 In the process of forming the external upper thread section 210 with a low thread height (or groove depth) of the dental implant 1000 of the present invention, the lower end of the external upper thread section 210 can be lowered to a lower position corresponding to 2 to 4 threads, starting from the lower end bottom surface of the boring portion 130 inside the dental implant 1000.

[0115] As described above, if the lowermost end of the outer upper thread section 210 is located below 2 to 4 threads from the lower end bottom surface of the boring portion 130 of the dental implant 1000, the thickness of the polygonal portion 120 and the circular vertical portion 140 formed by the stamping process can be indirectly reinforced, thereby improving the fracture stability.

[0116] On the other hand, refer to Fig.10 The first groove 212 of the external upper threaded section 210 and the second groove 222 of the external lower threaded section 220 may include: a first curved portion 212d, 222d, extending from the upper portion 212a, 222a of the groove to the side portion 212b, 222b; and a second curved portion 212e, 222e, extending from the side portion 212b, 222b of the groove to the lower portion 212c, 222c.

[0117] As described above, with the first and second curved portions formed at the corners of the grooves 212 and 222, stress can be dispersed when implanted in the alveolar bone to prevent stress concentration at the corners of the grooves 212 and 222, thereby improving the fracture stability of the dental implant 1000.

[0118] According to one embodiment, Fig.10 As shown, the first groove 212 of the outer upper thread section 210 and the second groove 222 of the outer lower thread section 220 can be asymmetric up and down with respect to a virtual line perpendicular to the axis CL and passing through the width center of the groove. At this time, preferably, the curvature of the first curved portion 212d, 222d is greater than the curvature of the second curved portion 212e, 222e.

[0119] That is, as the lower part of the groove is formed relatively slowly than the upper part of the grooves 212 and 222, when entering the alveolar bone, the implantation of the alveolar bone becomes relatively easy through the relatively slowly inclined second curved portions 212e and 222e, thereby improving the convenience of implantation. When the entry of the alveolar bone is completed, the relatively sharply inclined first curved portions 212d and 222d press the alveolar bones in the grooves 212 and 222 from the top, thereby facilitating the implantation stability.

[0120] On the other hand, refer to Figure 2 In order to improve the implantation stability of the dental implant 1000 , a partially cut cutting edge 223 may be provided at the lower end of the outer circumference of the dental implant 1000 . The cutting edge 223 may include a reverse helical section having a direction opposite to the helical direction of the threads 211 , 221 .

[0121] Alternatively, the cutting edge 223 may include a helical section formed in the helical direction of the threads 211 and 221. Furthermore, the cutting edge 223 may include a linear section in which a portion of the cutting edge 223 is parallel to the axis CL. In this case, the portion of the cutting edge 223 having the linear section may be disposed at the lower end of the cutting edge 223.

[0122] Fig.11 is a cross-sectional view of a dental implant assembly of the present invention, Fig.12 is a front view of the abutment of the present invention, Fig.13 for Fig.11 A partial enlarged view of .

[0123] Reference Figures 11 to 13 The dental implant assembly of the present invention may include a dental implant 1000 , an abutment 300 , and a fastening screw 400 .

[0124] The abutment 300 may be combined with the dental implant 1000 and support the restoration, and a fastening screw insertion hole 301 extending from the upper end to the lower end of the abutment 300 may be formed inside the abutment 300 .

[0125] The abutment 300 includes an upper portion 310 protruding outward from the dental implant 1000 to allow a restoration to be attached, and a lower portion 320 disposed at a lower side of the upper portion 310 and partially inserted into the inner groove 100 of the dental implant 1000 .

[0126] The lower portion 320 may include, starting from the upper side, a tapered insertion portion 321 , an anti-rotation portion 322 , a cylindrical portion 323 , and a retaining portion 324 .

[0127] The tapered insertion portion 321 may be inserted and placed in the upper inclined portion 110 of the dental implant 1000 , and may be formed in a shape corresponding to the upper inclined portion 110 .

[0128] The anti-rotation portion 322 may be disposed at the lower side of the tapered insertion portion 321 and inserted into the polygonal portion 120 of the dental implant 1000 to restrict the abutment 300 from rotating relative to the dental implant 1000. The anti-rotation portion 322 may be formed in a shape corresponding to the polygonal portion 120.

[0129] The cylindrical portion 323 may be disposed at the lower side of the anti-rotation portion 322 and may be substantially cylindrical in shape. At least a portion of the cylindrical portion 323 may be inserted into the circular vertical portion 140 of the dental implant 1000. More specifically, at least a portion of the cylindrical portion 323 may be inserted into the circular vertical portion 140 together with the retaining portion 324.

[0130] The retaining portion 324 may be disposed at the lower side of the cylindrical portion 323, and when the abutment 300 is inserted into the dental implant 1000, the retaining portion 324 is forcibly buckled into the inner circumference of the circular vertical portion 140 in an elastic manner, so that the abutment 300 is temporarily fixed to the dental implant 1000. That is, the retaining portion 324 is used to temporarily fix the abutment 300 to the inner circumference of the circular vertical portion 140. The retaining portion 324 may be provided in plurality and spaced apart around the lower end of the cylindrical portion 323. In addition, the retaining portion 324 may be provided in singular number and may form a closed curve around the lower end of the cylindrical portion 323. For example, the shape having a closed curve may include a circle, an ellipse, a polygon, etc.

[0131] When the fastening screw 400 is inserted into the fastening screw insertion hole 301 of the abutment 300 , the lower portion thereof is threadedly engaged with the internal threaded portion 150 of the dental implant 1000 , thereby firmly fixing the abutment 300 temporarily fixed to the dental implant 1000 .

[0132] The above description of the present invention is only an example. As long as one is a person of ordinary skill in the technical field to which the present invention belongs, it can be understood that it can be easily transformed into other specific forms without changing the technical ideas or necessary features of the present invention. Therefore, it should be understood that the embodiments described above are only examples in all aspects and are not restrictive. For example, each structural element described in a single form can be implemented in a dispersed manner, and similarly, the structural elements described in a dispersed manner can also be implemented in a combined form.

[0133] It should be explained that the scope of the present invention is represented by the scope of protection claimed for the invention, and all changes or deformations derived from the meaning and scope of the scope of protection claimed for the invention and its equivalent technical solutions belong to the scope of the present invention.

Claims

1. A dental implant, implanted in the alveolar bone according to a rotational action relative to an axis to form an artificial tooth root, characterized in that: include: an inner groove formed at an inner side of an upper end portion of the dental implant to engage an abutment for supporting a restoration; and An external threaded portion having threads formed from an upper end to a lower end of an outer peripheral surface of the external threaded portion so as to be implanted into an alveolar bone, The internal groove comprises: An upper inclined portion, located at the upper entrance of the implant, has a circular cross section, and the inner diameter of the upper inclined portion becomes narrower as it approaches the lower side; a polygonal portion formed at the lower side of the upper inclined portion and having a polygonal cross-sectional shape; a circular boring portion formed on the lower side of the polygonal portion and having a diameter larger than a diameter of a circle circumscribed with the polygon of the polygonal portion; a circular vertical portion formed on a lower side of the boring portion; and The internal thread portion is formed on the lower side of the circular vertical portion and has a thread for engaging with an abutment having a diameter smaller than a circle inscribed in the polygon of the polygonal portion. The angle at which the upper inclined portion of the inner groove is inclined relative to the axis is set to 14° to 16°.

2. The dental implant according to claim 1, characterized in that A wall thickness ratio of the circular vertical portion forming a perpendicular direction with the axis is set to 0.15 to 0.3 compared to a maximum outer diameter of the implant.

3. The dental implant according to claim 1, characterized in that The inner diameter of the circular vertical portion is set to be 0.5 mm to 1.8 mm smaller than the maximum inner diameter of the upper inclined portion.

4. The dental implant according to claim 1, characterized in that A ratio of a depth from an uppermost end of the upper inclined portion to a lowermost end of the internal thread portion to a depth from an uppermost end of the upper inclined portion to a lowermost end of the circular vertical portion is set to 0.5 to 0.

7.

5. The dental implant according to claim 1, characterized in that The depth from the uppermost end of the upper inclined portion to the lowermost end of the internal thread portion is set to 4 mm to 7 mm.

6. The dental implant according to claim 1, characterized in that The depth from the uppermost end of the upper inclined portion to the lowermost end of the circular vertical portion is set to 3 mm to 5 mm.

7. The dental implant according to claim 1, characterized in that The external threaded portion comprises: The outer upper end thread section is processed to form a first thread of a first height and a first groove of a first depth by a first cutting tool from the upper end of the outer peripheral surface of the implant to a predetermined section below; and The outer lower thread section is processed to form a second thread of a second height and a second groove of a second depth toward the lower side of the outer upper thread section by a second cutting tool having a processing surface shape and a width different from that of the first cutting tool, A first height of the first thread is lower than a second height of the second thread, and a first depth of the first groove is shallower than a second depth of the second groove.

8. The dental implant according to claim 7, characterized in that In the outer upper thread section and the outer lower thread section, the thread pitch and the peak width are the same.

9. The dental implant according to claim 7, characterized in that The first groove and the second groove include: a first curved portion extending from an upper portion of the groove toward a side portion; and The second curved portion extends from the side portion of the groove toward the lower portion.

10. The dental implant according to claim 9, characterized in that The curvature of the first curved portion is greater than the curvature of the second curved portion.

11. The dental implant according to claim 7, characterized in that The first groove and the second groove are vertically asymmetrical with respect to a virtual line which is perpendicular to the axis and passes through the width center of the groove.

12. The dental implant according to claim 1, characterized in that A partially cut cutting edge is provided at the lower end of the outer peripheral surface of the implant, and the cutting edge includes a reverse helical section in the opposite direction to the helical direction of the thread and a helical section formed toward the helical direction of the thread.

13. A dental implant assembly comprising: Dental implants, implanted in the alveolar bone according to a rotational action about an axis, to form an artificial tooth root, and Abutment is combined with the dental implant and supports the restoration, a fastening screw insertion hole is formed inside the abutment, and the fastening screw insertion hole extends from the upper end to the lower end of the abutment for inserting a fastening screw, The dental implant assembly is characterized in that The dental implant comprises: an inner groove formed at an inner side of an upper end portion of the dental implant to engage the abutment; and An external threaded portion, wherein a thread is formed from the upper end to the lower end of the outer peripheral surface of the external threaded portion so as to be implanted into the alveolar bone, The internal groove comprises: An upper inclined portion, located at the upper entrance of the implant, has a circular cross section, and the inner diameter of the upper inclined portion becomes narrower as it approaches the lower side; a polygonal portion formed at the lower side of the upper inclined portion and having a polygonal cross-sectional shape; a circular boring portion formed on the lower side of the polygonal portion and having a diameter larger than a diameter of a circle circumscribed with the polygon of the polygonal portion; a circular vertical portion formed on a lower side of the boring portion; and The internal thread portion is formed on the lower side of the circular vertical portion and has a thread for engaging with an abutment having a diameter smaller than a circle inscribed in the polygon of the polygonal portion. The angle at which the upper inclined portion of the inner groove is inclined relative to the axis is set to 14° to 16°.

14. The dental implant assembly according to claim 13, characterized in that: The abutment comprises: an upper side portion protruding toward the outside of the dental implant to allow the restoration to be attached; and a lower side portion, arranged at the lower side of the upper side portion and inserted into the inner groove, The abutment further includes a retaining portion, which is disposed at the lower end of the lower side portion and is elastically deformed when the abutment is inserted into the dental implant, and is forcibly buckled into the inner circumferential surface of the circular vertical portion, so that the abutment is temporarily fixed inside the dental implant.

15. The dental implant assembly according to claim 14, characterized in that The holding portion is provided in plurality and is arranged at intervals along the periphery of the lower end of the lower side portion, or is provided in a single number and forms a closed curve along the periphery of the lower end of the lower side portion.

Images