KR102698004B1 - Dental implant assembly - Google Patents

Abstract

One embodiment of the present invention provides a dental implant assembly including an implant that is inserted into an alveolar bone to form an artificial tooth root according to a rotational motion about an axis and an abutment that is coupled to the implant to support a prosthesis and has a fastening screw insertion hole formed therein that extends from top to bottom and into which a fastening screw is inserted, wherein the implant includes an internal groove formed on an upper surface to allow an abutment for supporting a prosthesis to be coupled, and an outer surface on which screw threads are formed from top to bottom, and the abutment includes an upper portion that protrudes outward from the implant and to which the prosthesis is attached, and a lower portion that is disposed below the upper portion and is inserted into the internal groove, and the outer surface is divided into an upper region and a lower region according to a preset height, and is surface-treated by laser processing to form at least one first groove, wherein at least one of an average width and an average depth of the first groove in the lower region is formed to be larger than that of the first groove in the upper region.

Description

DENTAL IMPLANT ASSEMBLY {DENTAL IMPLANT ASSEMBLY}

The present invention relates to a dental implant assembly.

Dental implants (hereinafter referred to simply as 'implants') inserted into the alveolar bone have been used for a long time, and implants currently in general use are made of titanium, titanium alloy, or ceramic materials with excellent biocompatibility.

Implants must not only be able to functionally perform the role of actual teeth, but they must also be manufactured to properly distribute the load applied to the teeth so that they can be used for as long as actual teeth.

Implants implanted in the alveolar bone are classified into external connection and internal connection types depending on the form in which they are connected to the abutment. The external connection method has the advantage of making the implant inserted into the bone relatively solid, but has the disadvantage of causing bone resorption at the boundary because the gap between the implant and the abutment is wide in the early stages after implantation, which increases the likelihood of bacteria colonizing the implant.

Therefore, the internal connection method is mainly used recently. The internal connection method forms a hexagonal groove (generally called a hexahedron) inside the implant, and forms the part where the abutment meets the implant in a cone shape to exclude space for bacteria to inhabit, thereby minimizing initial bone absorption, which has the advantage of a high implant success rate. However, there is a disadvantage in that the possibility of fracture of the implant inserted into the bone is relatively high due to structural limitations caused by the abutment going inside the implant.

Fracture is caused by fatigue. Fatigue is a phenomenon in which, when repeated stress occurs in materials and structures, the strength of the material or structure decreases and ultimately destruction occurs as the number of repetitions of stress increases. During mastication, not only the vertical masticatory force in the axial direction acts on the abutment, but also the horizontal masticatory force perpendicular to the axial direction acts in a complex manner, and the bottom of the abutment may touch the hexagon and apply repeated force. As a result, tensile stress may be periodically applied to the corners of the hexagon, which are geometrically discontinuous points, which may cause fatigue fracture in the form of vertical or transverse fracture.

Meanwhile, in implant surgery, the osteointegration characteristics of the implant are very important. Excellent osteointegration characteristics mean that after the implant is fixed to the bone and initial stability is achieved, a permanent bond is created between the implant and the bone within a short treatment period.

In order to improve the osseointegration characteristics in this way, the implant surface can be appropriately treated. The surface treatment method is, for example, chemically roughened by sandblasting, anodic oxidation, or etching. Alternatively, the surface can be treated by an additive method, such as coating or immersing a material with excellent biocompatibility. An implant surface-treated by the above-described surface treatment method can shorten the healing period after the procedure.

In particular, as an example of a conventional surface treatment method, a method has been proposed to improve osseointegration characteristics by providing surface roughness to the surface of an implant by sandblasting and etching. However, implants surface-treated by the conventional method described above have a problem in that the osseointegration characteristics are not sufficiently implemented because the surface roughness is provided in an irregular shape on the surface.

Korean Utility Model Registration No. 20-0386621 (June 2, 2005)

The present invention is intended to solve the problems of the prior art as described above, and an object of the present invention is to provide a dental implant assembly having improved fatigue fracture resistance and excellent osseointegration characteristics by being configured to have different surface roughness depending on the surface location.

In order to achieve the above object, one aspect of the present invention provides a dental implant assembly including an implant which is inserted into an alveolar bone to form an artificial tooth root according to a rotational motion about an axis and an abutment which is coupled to the implant to support a prosthesis and has a fastening screw insertion hole formed therein extending from top to bottom and into which a fastening screw is inserted, wherein the implant includes an internal groove formed on an upper surface to enable an abutment for supporting a prosthesis to be coupled, and an outer surface on which screw threads are formed from top to bottom, and the abutment includes an upper portion which protrudes outward from the implant and to which the prosthesis is attached, and a lower portion which is disposed below the upper portion and is inserted into the internal groove, and the outer surface is divided into an upper region and a lower region according to a preset height, and is surface-treated by laser processing to form at least one first groove, wherein at least one of an average width and an average depth of the first groove of the lower region is formed to be larger than that of the first groove of the upper region.

In one embodiment of the present invention, the internal groove may be a dental implant assembly including an upper inclined portion having a circular cross-section and an inner diameter that narrows downwardly from the upper surface entrance to a certain depth, a polygonal portion having a polygonal cross-section shape downwardly from the upper inclined portion to a certain depth, a circular boring section formed before the polygonal portion and having a diameter greater than the diameter of a circle circumscribing the polygon of the polygonal portion downwardly from the polygonal portion to a certain depth, a second circular vertical portion having a smaller diameter than the boring section downwardly from the boring section to a certain depth, and an internal screw portion having an abutment-attaching screw thread formed downwardly from the second circular vertical portion to a certain depth and having a smaller diameter than the circle inscribing the polygon of the polygonal portion.

In one embodiment of the present invention, the abutment may be a dental implant assembly further including a holding portion that is disposed at the lower end of the lower portion and is elastically deformed when the abutment is inserted into the implant and is forcefully fitted onto the inner surface of the second circular vertical portion to temporarily fix the abutment inside the fixture.

In one embodiment of the present invention, the outer surface may be a dental implant assembly characterized in that one or more second grooves are formed by surface treatment through etching after laser processing.

In one embodiment of the present invention, the second groove may be formed on a surface of the first groove, which may be a dental implant assembly.

In one embodiment of the present invention, the boring section may be a dental implant assembly, characterized in that it includes a first circular vertical portion and a round portion having a predetermined curvature downward of the first circular vertical portion, and a diameter of the first circular vertical portion is greater than the diameter of the circumscribed circle of the polygonal portion.

In one embodiment of the present invention, the outer surface may be a dental implant assembly characterized in that the screw threads are formed with a single pitch, the upper screw thread section having a shallow groove depth screw thread formed from a certain distance from the top, and the lower screw thread section having a deep groove depth screw thread formed below the upper screw thread section.

In one embodiment of the present invention, the boring section may be a dental implant, characterized in that it is located from the lower boundary of the upper screw thread section to the upper side of the first mountain, the upper side of the second mountain, or the upper side of the third mountain.

In one embodiment of the present invention, the first groove may have an average width of 5 to 100 μm, an average depth of 5 to 50 μm, and an average width and an average depth of the second groove may be 1 to 10 μm, which may be a dental implant.

In order to achieve the above object, another aspect of the present invention is a dental implant assembly including an implant that is inserted into an alveolar bone to form an artificial tooth root according to a rotational motion about an axis, and an abutment that is coupled to the implant to support a prosthesis and has a fastening screw insertion hole formed inside from the top to the bottom and into which a fastening screw is inserted, wherein the implant includes an internal groove formed on an upper surface so that an abutment for supporting a prosthesis can be coupled, and an outer surface on which screw threads are formed from the top to the bottom, and the abutment includes an upper portion that protrudes outward from the implant and to which the prosthesis is attached, and a lower portion that is disposed below the upper portion and is inserted into the internal groove, and the outer surface is divided into an upper region, a first lower region, and a second lower region according to a preset height, and is surface-treated by laser processing to form at least one first groove, wherein at least one of an average width and an average depth of the first groove of the first lower region is formed larger than that of the first groove of the upper region, and an average width of the first groove of the second lower region is formed larger than that of the first groove of the upper region. And at least one of the average depths is formed larger than the first groove of the second lower region.

According to one aspect of the present invention, since the internal groove of a dental implant includes a boring section, the phenomenon of the parent material being pushed downwards into the polygonal portion by a punching tool during machining of the polygonal portion, thereby concentrating compressive residual stress and crack nuclei, can be prevented.

In addition, the upper area of the outer surface has relatively low roughness, which can inhibit the proliferation of bacteria, and at the same time, the lower area has relatively large roughness, which can improve the osseointegration performance.

The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

FIG. 1 is an exploded perspective view of a dental implant assembly according to one embodiment of the present invention.
Figure 2 is a cross-sectional view of a joint of a dental implant assembly according to one embodiment of the present invention.
Figure 3 shows an implant and a surface shape of the implant according to one embodiment of the present invention.
Figure 4 shows a cross-sectional view of an implant according to one embodiment of the present invention.
Figure 5 shows a partial enlarged view of an implant according to one embodiment of the present invention.
Figure 6 shows a front view of an implant according to one embodiment of the present invention.
Figure 7 shows a cross-sectional view of an implant according to one embodiment of the present invention.
FIG. 8 is a drawing for explaining details of a polygonal portion processing method according to one embodiment of the present invention.
Figure 9 is a front view of an abutment according to one embodiment of the present invention.
Figure 10 is a perspective view of Figure 9.
Figure 11 is a partially enlarged view of Figure 2.
Figure 12 is a diagram illustrating a surface treatment method of an implant according to one embodiment of the present invention.
Figure 13 is an SEM image of the upper and lower regions of the outer surface of one embodiment of the present invention.
Figure 14 shows an implant and a surface shape of the implant according to another embodiment of the present invention.
Figure 15 is an SEM image of the upper region, the first lower region, and the second lower region of the outer surface in another embodiment of the present invention.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention can be implemented in various different forms, and therefore, it is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are assigned similar drawing reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another part in between. Also, when a part is said to "include" a certain component, this does not mean that it excludes other components, but rather that it can have other components, unless otherwise specifically stated.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is an exploded perspective view of a dental implant assembly according to an embodiment of the present invention, FIG. 2 is a combined cross-sectional view of a dental implant assembly according to an embodiment of the present invention, FIG. 3 illustrates an implant and a surface shape of the implant according to an embodiment of the present invention, FIG. 4 is a perspective cross-sectional view of an implant according to an embodiment of the present invention, FIG. 5 is a partially enlarged view of an implant according to an embodiment of the present invention, FIG. 6 is a front view of an implant according to an embodiment of the present invention, FIG. 7 is a cross-sectional view of an implant according to an embodiment of the present invention, and FIG. 8 is a drawing for explaining details of a polygonal portion processing method according to an embodiment of the present invention.

Referring to FIGS. 1 and 2, a dental implant assembly (1000) includes an implant (100) and an abutment (200).

More specifically, a dental implant assembly (1000) is configured to include an implant (100) that is inserted into the alveolar bone to form an artificial tooth root according to a rotational motion about an axis, and an abutment (200) that is connected to the implant (100) to support a prosthesis, and has a fastening screw insertion hole (201) formed therein that extends from the top to the bottom and into which a fastening screw (300) is inserted.

Referring to FIGS. 1 to 7, an implant (100) is inserted into the alveolar bone and functions as an artificial tooth root according to a rotational motion about an axis, and includes an inner groove (110) formed on an upper surface to allow an abutment for supporting a prosthesis to be combined, and an outer surface (120) on which screw threads are formed from the upper surface to the lower surface.

The internal groove (110) of the implant (100) is configured to include an upper inclined portion (111), a polygonal portion (112), a boring section (113), and an internal threaded portion (116) from the top.

More specifically, the inner groove (110) is configured to include an upper inclined portion (111) having a circular cross-section and an inner diameter that becomes narrower as it goes downward from the entrance on the upper surface of the implant to a certain depth, a polygonal portion (112) having a polygonal cross-section shape downward from the upper inclined portion (111) to a certain depth, an internal thread portion (116) having an abutment-attaching screw thread formed downward from the polygonal portion (112) to a certain depth, and having a diameter smaller than a circle inscribed in the polygonal portion (112), and a circular boring section (113) formed before the polygonal portion (112) between the lower end of the polygonal portion (112) and the upper end of the internal thread portion (116) and having a diameter larger than a diameter of a circle inscribed in the polygonal portion (112).

Meanwhile, the inner groove (110) may further include a second circular vertical portion (114) having a smaller diameter than the boring section (113) at a predetermined depth below the boring section (113), and an inner inclined portion (115) having a circular cross-section and an inner diameter that becomes narrower as it goes downward at a predetermined depth below the second circular vertical portion (114). At this time, the inner screw portion (116) may be located below the inner inclined portion (115).

The upper inclined portion (111) extends downward from the top of the implant (100) and has a tapered shape with a diameter that becomes narrower as it goes downward.

The polygonal portion (112) is arranged between the upper inclined portion (111) and the first boring section (113) and prevents the abutment inserted into the inner groove (110) from rotating about the axis (CL). In the present embodiment, the polygonal portion (112) has a hexagonal shape, but is not limited thereto and may have various shapes.

The internal threaded portion (116) is a portion positioned on the lower side of the inner inclined portion (115) and has screw threads formed on the inner surface. A fastening screw inserted into the fastening screw insertion hole of the abutment can be screw-connected to the internal threaded portion (116).

Meanwhile, referring to FIG. 8, the boring section (113) may be formed before the polygonal portion (112) by a diameter larger than the circumscribed circle diameter of the polygonal portion (112).

This boring section (113) is intended to prevent the phenomenon in which the parent material of the upper inclined portion (111), which is plastically deformed by the punching tool (10) when the polygonal portion (112) is processed, is pushed toward the bottom of the polygonal portion (112), thereby concentrating compressive residual stress and crack nuclei. That is, as the boring section (113) is formed, the parent material of the upper inclined portion (111) is mainly separated by the striking of the punching tool (10) or is only pushed outward in a radial direction, and the problem of the parent material being severely deformed and pushed in and being pushed toward the bottom of the polygonal portion (112), thereby causing crack nuclei, does not occur.

In other words, after processing the boring section (113) so that extreme plastic deformation is not caused to the parent material, the polygonal portion (112) is formed through punching. A circular boring section (113) having a diameter larger than the diameter of a circle circumscribed to a regular polygon of the polygonal portion is processed between the lower end of the polygonal portion (112) and the upper end of the internal screw portion (116) prior to the punching process of the polygonal portion (112).

The boring section (113) is not particularly limited in its shape as long as it can perform the above-mentioned role, but more preferably, the boring section may include a first circular vertical section (131) and a round section (132) having a certain curvature below the first circular vertical section (131).

More specifically, as shown in Fig. 8 (a), a boring section (113) is machined at the lower end of the upper inclined section (111) using a boring tool. The boring section (113) may be formed of a first circular vertical section (131) and a round section (132) having a predetermined curvature below the first circular vertical section (131). The radius of the boring section (113) should be set to be equal to or greater than the length from the geometric center to the edge of the cross-section of the punching tool (10) used in the polygonal section (112) machining process (as a result, this length corresponds to the radius of the circumscribed circle of the polygonal section). That is, the diameter of the first circular vertical section (131) may be formed to be equal to or greater than the diameter of the circumscribed circle of the polygonal section (112).

As shown in Fig. 8 (b), in the past, the workpiece of the parent material would be plastically deformed downwards and forced in by the punching tool entering from above, which resulted in severe deformation of the parent material and the distribution of numerous crack nuclei. However, as shown in Fig. 8 (c), according to the present invention, the workpiece portion is processed in a manner in which the punching tool cuts it off like a knife or scissors, or in a manner in which the side of the workpiece portion cannot be pushed to the lower edge (even if it is pushed to the edge, it can be easily removed by a general deburring operation), so that the problems of the existing technology discussed above can be eliminated.

Meanwhile, referring to FIGS. 6 and 7, the outer surface (120) may be configured with an upper thread section (121) in which threads (121a) having a shallow groove depth (D1) are formed from a single pitch (P) of the screw threads, and may be configured with a lower thread section (122) in which threads (122a) having a deep groove depth (D2) are formed below the upper thread section (210). In addition, a line connecting the apex of the threads (121a) of the upper thread section (121) and the apex of the threads (122a) of the lower thread section (122) may be continuous from the top to the bottom of the implant (100).

The lower surface of the round portion (132) of the boring section (113) may be located above the first mountain, above the second mountain, or above the third mountain from the lower boundary of the upper screw thread section (121). With this configuration, although the wall thickness portion that has become thin due to the boring section (113) is not directly reinforced, the structural rigidity can be further increased below the boring section (113), so that it can function as a better defense means against fatigue fracture situations.

FIG. 9 is a front view of an abutment according to one embodiment of the present invention, FIG. 10 is a perspective view of FIG. 9, and FIG. 11 is a partial enlarged view of FIG. 2.

Referring to FIG. 2, FIG. 9 to FIG. 11, an abutment (200) is connected to the implant (100) to support a prosthesis, and a fastening screw insertion hole (201) extending from the top to the bottom is formed inside.

The abutment (200) includes an upper portion (210) that protrudes outside the implant (100) and to which the prosthesis is attached, and a lower portion (220) that is positioned below the upper portion (210) and inserted into the internal groove (110) of the implant (100).

The lower part (220) includes a tapered insertion part (230), an anti-rotation part (240), a cylindrical part (250), and a holding part (260).

The tapered insertion portion (230) is inserted into the upper inclined portion (111) of the implant (100) and can be formed in a shape corresponding to the upper inclined portion (111).

The anti-rotation portion (240) is inserted into the polygonal portion (112) of the implant (100) to restrict the relative rotation of the abutment (200) with respect to the implant (100). This anti-rotation portion (240) can be formed in a shape corresponding to the polygonal portion (112).

The cylindrical portion (250) is positioned between the anti-rotation portion (240) and the holding portion (260) and is formed in an approximately cylindrical shape. At least a portion of the cylindrical portion (250) is inserted into the second circular vertical portion (114) of the implant (100). Specifically, at least a portion of the cylindrical portion (250) is inserted into the second circular vertical portion (114) together with the holding portion (260).

The holding portion (260) is positioned below the cylindrical portion (250) and, when the abutment (200) is inserted into the implant (100), is forcefully fitted into the inner surface of the second circular vertical portion (114) to temporarily fix the abutment (200) to the inside of the implant (100). In other words, the holding portion (260) temporarily fixes the abutment (200) to the inside of the implant (100) while having an elasticity difference between the upper and lower parts. The holding portion (260) is composed of a plurality of elastic protrusions that are spaced apart from each other, and is configured so that at least one pair can be firmly forcefully fitted into the second circular vertical portion (114).

In this holding part (260), a step (263) is formed on the inner surface facing the fastening screw (300) so as to be spaced apart by a predetermined distance from the fastening screw (300) inserted into the fastening screw insertion hole (201).

Meanwhile, the holding portion (260) is composed of a first portion (261) and a second portion (262). The first portion (261) is a portion whose outer surface extends vertically, and the second portion (262) is a portion that extends downward from the first portion (261) and whose outer surface protrudes outwardly and is forcibly fitted into the second circular vertical portion (114).

The step (263) is configured to include a downwardly inclined surface (263a) that slopes away from the fastening screw (300) and a vertical surface (263b) that extends downward from the inclined surface (263a). The step (263) has the function of increasing the elasticity of the holding portion (260) and also has the function of preventing foreign substances from being caught between the abutment (200) and the fastening screw (300) inside the implant (100).

However, the shape of the step (263) is not limited to this, and it is also possible for the step to include a horizontal plane extending horizontally in a direction away from the fastening screw (300) and a vertical plane extending downward from the horizontal plane.

The fastening screw (300) is inserted into the fastening screw insertion hole (201) of the abutment (200) and is screwed into the internal threaded portion (116) of the implant (100) at the lower end to fix the abutment (200) to the implant (100).

FIG. 12 is a diagram illustrating a surface treatment method of an implant according to one embodiment of the present invention, and FIG. 13 is an SEM image of an upper region and a lower region of an outer surface according to one embodiment of the present invention.

The implant (100) may be a titanium-based material. The titanium-based material refers to a material made of pure titanium or an alloy of titanium and another metal on the periodic table. The titanium alloy may be, for example, one selected from the group consisting of titanium (Ti), aluminum (Al), silicon (Si), vanadium (V), niobium (Nb), zirconium (Zr), molybdenum (Mo), chromium (Cr), tin (Sn), tantalum (Ta), palladium (Pd), and a combination of at least one of these, but is not limited thereto.

Referring to FIGS. 3, 12, and 13, the outer surface (120) of the implant (100) can be surface-treated through a laser processing step and an etching step, and a macro surface including one or more first grooves (123) can be formed on the outer surface (120) through the laser processing, and a micro surface including one or more second grooves (124) can be formed on the outer surface (120) through the etching step.

That is, the outer surface (120) of the processed implant (100) to which a separate surface roughness is not provided can be primarily processed by laser processing. By laser processing the outer surface (120) to regularly form one or more first grooves (123), a macro surface with a uniform shape can be implemented. When the macro surface on which one or more first grooves (123) are formed is etched to form a micro surface including one or more second grooves (124), the surface area of the outer surface (120) increases, and as a result, the bone interface bonding force increases due to the roughening effect, so that the cellular response after implantation can be further activated.

In one embodiment, the outer surface (120) is divided into an upper region (Ua) and a lower region (La) according to a preset height, and at least one of an average width and an average depth of the first groove (123) in the lower region (La) may be formed to be larger than that in the upper region (Ua). In this case, the upper region (Ua) may mean an area 0.5 to 2 mm downward from the top, and the lower region (La) may mean the remaining area.

In one embodiment, the outer surface (120) is divided into an upper region (Ua) and a lower region (La) according to a preset height, and the upper region (Ua) is a portion that contacts the cortical bone and a first groove (123) having a depth of 1 to 15 μm and a width of 1 to 25 μm is formed, and the lower region (La) is a portion that contacts the cancellous bone and a first groove (123) having a depth of 20 to 75 μm and a width of 30 to 125 μm may be formed. That is, by forming a relatively small first groove (123) in the upper region (Ua) and a relatively large first groove (123) in the lower region (La), the upper region (Ua) can have a relatively low roughness, which can suppress the proliferation of bacteria, and at the same time, the lower region (La) can have a relatively large roughness, which can improve the osseointegration performance.

By laser processing the outer surface (120) of the implant (100), one or more first grooves (123) can be formed in a regular shape to impart macro surface characteristics. The laser may be a UV laser, and for example, a UV laser beam having an ultraviolet wavelength of 200 to 400 nm can be irradiated. The ultraviolet wavelength of the UV laser beam may be, for example, 200 nm, 210 nm, 220 nm, 230 nm, 240 nm, 250 nm, 260 nm, 270 nm, 280 nm, 290 nm, 300 nm, 310 nm, 320 nm, 330 nm, 340 nm, 350 nm, 360 nm, 370 nm, 380 nm, 390 nm or 400 nm, but is not limited thereto. As the wavelength of the UV laser beam decreases, the intensity of the laser beam increases. Therefore, an appropriate value can be selected within the above range by considering the width, depth, etc. of the first groove (123) to be implemented on the outer surface (120) of the implant (100) of the present specification.

In addition, the pulse width of the laser may be 1 to 200 ns (nano second), for example, 1 ns, 2 ns, 3 ns, 4 ns, 5 ns, 6 ns, 7 ns, 8 ns, 9 ns, 10 ns, 15 ns, 20 ns, 25 ns, 30 ns, 35 ns, 40 ns, 45 ns, 50 ns, 55 ns, 60 ns, 65 ns, 70 ns, 75 ns, 80 ns, 85 ns, 90 ns, 95 ns, 100 ns, 110 ns, 115 ns, 120 ns, 125 ns, 130 ns, 135 ns, 140 ns, 145 ns, 150 ns, 155 ns, 160 ns, 165 ns, 170 ns, 175 ns, It may be, but is not limited to, 180 ns, 185 ns, 190 ns, 195 ns, or 200 ns. The pulse width of the laser refers to the duration of the irradiated laser beam, and if the pulse width of the laser exceeds 200 ns, the width and depth of the first groove (123) may excessively increase, and if it is less than 1 ns, the surface roughness may not be sufficiently implemented, thereby deteriorating the osseointegration characteristics.

Meanwhile, the average width of the first groove (123) may be 5 to 100 ㎛, and the average depth may be 5 to 50 ㎛. The average width of the first groove (123) may be, for example, 5 ㎛, 6 ㎛, 7 ㎛, 8 ㎛, 9 ㎛, 10 ㎛, 15 ㎛, 20 ㎛, 25 ㎛, 30 ㎛, 35 ㎛, 40 ㎛, 45 ㎛, 50 ㎛, 55 ㎛, 60 ㎛, 65 ㎛, 70 ㎛, 75 ㎛, 80 ㎛, 85 ㎛, 90 ㎛, 95 ㎛ or 100 ㎛, but is not limited thereto. If the average width of the first groove (123) exceeds 100 ㎛, the durability of the implant (100) may be deteriorated, and if it is less than 5 ㎛, the osseointegration characteristics of the implant (100) may be deteriorated.

In one embodiment, the difference between the maximum width and the minimum width of the first groove (123) may be 50% or less, for example, 50%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, 5%, or a range between any two of these values. For example, if the difference between the maximum width and the minimum width is 50%, it means that if the largest width of the first groove (123) is 100 μm, the smallest width is 50 μm or more. If this characteristic is additionally satisfied, the osseointegration characteristic can be significantly improved.

In addition, the average depth of the first groove (123) may be, for example, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm or 50 μm, but is not limited thereto. If the average depth of the first groove (123) exceeds 50 μm, the durability of the implant may be deteriorated, and if it is less than 5 μm, the osseointegration characteristics of the implant may be deteriorated.

In one embodiment, the difference between the maximum depth and the minimum depth of the first groove (123) may be 50% or less, for example, 50%, 45%, 40%, 35%, 30%, 25%, 20%, 15%, 10%, 5%, or a range between any two of these values. By further satisfying this characteristic, the second groove (124) forming the micro surface is formed more uniformly, thereby solving the problem of insufficient osseointegration in some areas.

After one or more first grooves (123) are formed on the outer surface (120) by laser processing to initially provide surface roughness, the outer surface (120) can be etched to form one or more second grooves (124) smaller in size than the first grooves (123), thereby providing micro surface characteristics.

The average width and average depth of the second groove (240) may be 1 to 10 μm, and may be, for example, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm or 10 μm, but are not limited thereto. If the average width and average depth of the second groove (124) exceed 10 μm, the durability of the implant (100) may deteriorate, and if it is less than 1 μm, the osseointegration characteristics of the implant (100) may deteriorate.

In one embodiment, one or more of the second grooves (124) may be formed within the first groove (123) of the implant (100). When the micro surface is formed within the macro surface of the implant (100), the mutual bonding between the implant (100) and the bone is improved, thereby shortening the healing period after the procedure.

Meanwhile, the etching step can be performed by treating an etching solution, and the etching solution can be one selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrogen peroxide, and a mixture of two or more thereof, but is not limited thereto. For example, when the etching solution is a mixture of hydrochloric acid and sulfuric acid, the content of the hydrochloric acid can be 50 to 100 vol%, and for example, can be 50 vol%, 55 vol%, 60 vol%, 65 vol%, 70 vol%, 75 vol%, 80 vol%, 85 vol%, 90 vol%, 95 vol%, or 100 vol%, but is not limited thereto.

In one embodiment, the etching can be performed for 10 seconds to 120 minutes, for example, 10 seconds, 30 seconds, 60 seconds, 3 minutes, 5 minutes, 10 minutes, 15 minutes, 20 minutes, 25 minutes, 30 minutes, 35 minutes, 40 minutes, 45 minutes, 50 minutes, 55 minutes, 60 minutes, 65 minutes, 70 minutes, 75 minutes, 80 minutes, 85 minutes, 90 minutes, 95 minutes, 100 minutes, 105 minutes, 110 minutes, 115 minutes, 120 minutes or a time in a range between any two of these values. The etching time can vary depending on the type of etchant, and is typically, but not limited to, 10 to 40 minutes.

FIG. 14 shows an implant and a surface topography of the implant according to another embodiment of the present invention, and FIG. 15 is an SEM image of an upper region, a first lower region, and a second lower region of an outer surface of another embodiment of the present invention.

Referring to FIGS. 12, 14, and 15, the outer surface (120) is divided into an upper region (Ua), a first lower region (La1), and a second lower region (La2) according to a preset height, and at least one of an average width and an average depth of a first groove (123) in the second lower region (La2) may be formed to be larger than that in the first lower region (La1), and at least one of an average width and an average depth of a first groove (123) in the first lower region (La1) may be formed to be larger than that in the upper region (Ua).

At this time, a first groove (123) having an average depth of 1 to 15 μm and an average width of 1 to 25 μm can be formed in the upper region (Ua) of the outer surface (120), a first groove (123) having an average depth of 20 to 35 μm and an average width of 30 to 65 μm can be formed in the first lower region (La1), and a first groove (123) having an average depth of 40 to 75 μm and an average width of 70 to 125 μm can be formed in the second lower region (La2).

In this way, the outer surface (120) is divided into three or more regions, including an upper region (Ua), a first and second lower regions (La1, La2), and the surface roughness increases as it goes toward the lower region, thereby enabling a balanced improvement in the inhibition of bacterial growth and bone fusion characteristics.

In addition, the average width and average length of the first and second grooves, the performance conditions of the laser processing as a surface treatment method, the performance conditions of the etching treatment, and the technical details regarding the effects thereof are as described above.

The above description of the present invention is for illustrative purposes, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical idea or essential characteristics of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single component may be implemented in a distributed manner, and likewise, components described as distributed may be implemented in a combined manner.

The scope of the present invention is indicated by the claims described below, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

1000 Dental Implant Assembly
100 implants
110 Internal Home
111 Upper slope
112 Polygonal section
113 Boring section
113a 1st circular vertical section
113b round section
114 2nd circular vertical section
115 inner slope
116 Internal thread
120 External surface
121 Upper thread section
121a thread
122 Lower thread section
122a thread
123 1st Home
124 2nd Home
200 Abutment
201 Fastening screw insert hole
210 upper side
220 Lower part
230 taper insert
240 anti-rotation part
250 cylinder
260 holding section
261 Part 1
262 Part 2
263 Step
263a single-step slope
263b single-step vertical plane
300 fastening screws
10 Punching Tools
Ua upper area
La subarea
La1 Subarea 1
La2 Second subarea

Claims (10)

A dental implant assembly comprising an implant that is inserted into the alveolar bone to form an artificial tooth root according to a rotational movement about an axis, and an abutment that is connected to the implant to support a prosthesis, and has a screw insertion hole formed therein that extends from the top to the bottom and into which a screw is inserted.
The above implant comprises an inner groove formed on the upper surface to allow an abutment for supporting a prosthesis to be combined, and an outer surface on which screw threads are formed from the upper surface to the lower surface.
The abutment includes an upper portion protruding outward from the implant to which the prosthesis is attached, and a lower portion positioned below the upper portion and inserted into the internal groove.
A dental implant assembly, wherein the outer surface is divided into an upper region and a lower region according to a preset height, and is surface-treated by laser processing to form one or more first grooves, wherein at least one of the average width and the average depth of the first groove in the lower region is formed larger than that of the first groove in the upper region. In the first paragraph,
The above inner groove is,
An upper inclined portion having a circular cross-section from the upper surface entrance to a certain depth downward and having an inner diameter that narrows as it goes downward;
A polygonal section having a polygonal cross-section shape below a certain depth of the upper slope;
A circular boring section formed before the polygonal portion, having a diameter greater than the diameter of a circle circumscribed to the polygonal portion below a certain depth of the polygonal portion;
A second circular vertical section having a diameter smaller than the boring section below a predetermined depth of the boring section; and
A dental implant assembly, comprising an internal screw portion having an abutment-attaching screw thread having a diameter smaller than a circle inscribed in the polygon of the polygon portion formed at a predetermined depth below the second circular vertical portion. In the second paragraph,
The above abutment is,
A dental implant assembly further comprising a holding portion that is arranged at the lower end of the lower portion and is elastically deformed when the abutment is inserted into the implant and is forcefully fitted onto the inner surface of the second circular vertical portion to temporarily fix the abutment to the inside of the implant. In the first paragraph,
A dental implant assembly, characterized in that the outer surface is surface-treated by etching after laser processing to form one or more second grooves. In paragraph 4,
A dental implant assembly, characterized in that the second groove is formed on the surface of the first groove. In the second paragraph,
The above boring section is,
First circular vertical section; and
It includes a round portion having a certain curvature downward from the first circular vertical portion,
A dental implant assembly, characterized in that the diameter of the first circular vertical portion is greater than the diameter of the circumscribed circle of the polygonal portion. In the second paragraph,
A dental implant assembly, characterized in that the outer surface is formed with a single-pitch screw thread, and is composed of an upper screw thread section in which shallow screw threads are formed from a certain distance from the top, and a lower screw thread section in which deep screw threads are formed below the upper screw thread section. In Article 7,
A dental implant assembly, characterized in that the boring section is located from the lower boundary of the upper screw thread section to the upper side of the first mountain, the upper side of the second mountain, or the upper side of the third mountain. In paragraph 4,
A dental implant assembly, wherein the average width of the first groove is 5 to 100 μm, the average depth is 5 to 50 μm, and the average width and average depth of the second groove are 1 to 10 μm. A dental implant assembly comprising an implant that is inserted into the alveolar bone to form an artificial tooth root according to a rotational movement about an axis, and an abutment that is connected to the implant to support a prosthesis, and has a screw insertion hole formed therein that extends from the top to the bottom and into which a screw is inserted.
The above implant comprises an inner groove formed on the upper surface to allow an abutment for supporting a prosthesis to be combined, and an outer surface on which screw threads are formed from the upper surface to the lower surface.
The abutment includes an upper portion protruding outward from the implant to which the prosthesis is attached, and a lower portion positioned below the upper portion and inserted into the internal groove.
The above outer surface is divided into an upper region, a first lower region, and a second lower region according to a preset height, and is surface-treated by laser processing to form one or more first grooves.
A dental implant assembly, wherein at least one of the average width and the average depth of the first groove of the first lower region is formed to be larger than that of the first groove of the upper region, and at least one of the average width and the average depth of the first groove of the second lower region is formed to be larger than that of the first groove of the first lower region.