Dental implant surface treatment method and dental implant surface-treated using same

Abstract

The present invention provides: a method for treating the surface of a dental implant such that an osseointegration topography is provided on the surface; and a dental implant. The surface treatment method comprises: a step of preparing a pure titanium or titanium-zirconium implant body having external screw threads; a primary surface treatment step of performing sand blasting or laser surface treatment on the outer surface of the implant body having the external threads; and a secondary surface treatment step of treating the surface of the implant body, which is primarily surface-treated using an etching solution.

Description

Dental implant surface treatment method and dental implant surface treated by the method

[0001] The present invention relates to a method for surface treatment of a dental implant, and more particularly, to a method for surface treatment of a dental implant having a topography suitable for osseointegration on the surface, and to a dental implant surface treated by the method.

[0002] While implants are typically used to replace lost tissue, in dentistry they refer to artificial teeth. This implant procedure is widely used as a replacement treatment to restore or reconstruct the function of lost or deteriorating teeth, bringing them back to their original form.

[0003] Dental implants are typically made of pure titanium, and the surface is preferably roughened by SLA (Sandblast with Large Grit and Acid Etched) technology to promote rapid and strong osseointegration. For reference, SLA surface treatment technology is an implant surface treatment technology that includes sandblasting treatment that implements a macro surface shape by evenly spraying amorphous ceramic powders such as Al2O3, TiO2, Zr2O3, and Hydroxyapatite onto the surface of the machined implant body at high pressure, and etching treatment that implements a micro surface shape through acid treatment.

[0004] Pure titanium, due to its high biocompatibility, rarely causes rejection in the human body. However, problems can arise if the material's mechanical strength is low. More specifically, inadequate mechanical strength (e.g., tensile strength or fatigue strength) can lead to implant fracture during the procedure, increasing the risk of clinical failure.

[0005] As an alternative, a technology has been proposed to use a titanium alloy that is biocompatible and has high mechanical strength by mixing titanium with other metals as a dental implant material. For example, WO 1997-029624 describes the use of a titanium-zirconium (Ti-Zr) alloy containing more than 5 wt% and less than 25 wt% zirconium (Zr) based on the total 100 wt% of the alloy as an implant material.

[0006] The titanium-zirconium (Ti-Zr) alloy disclosed in WO 1997-029624 exhibits superior mechanical properties to those of pure titanium by cold working. According to WO 1997-029624, the alloy can be produced by hot forging followed by cold working. The forging process can be performed at a temperature of at least 850°C, or alternatively, within the alpha / beta phase transition range of 770 to 830°C.

[0007] The success of dental implant procedures depends on how quickly and strongly the implant interacts with the surrounding bone tissue. From the perspective of rapid and strong osseointegration, it is desirable to achieve a surface topography similar to that of a conventional pure titanium implant surface treated using SLA.

[0008] However, because the microstructure of titanium-zirconium alloys differs from that of pure titanium, it is not easy to replicate the surface of pure titanium implants. In other words, it is difficult to replicate the surface topography of titanium-zirconium implants with the same surface treatment conditions as pure titanium implants.

[0009] Furthermore, while SLA surface treatment is commonly performed as a surface treatment method for implants composed of pure titanium and titanium alloys, SLA surface treatment can cause problems such as imparting irregular shapes to the surface, which may hinder the proper implementation of osseointegration characteristics. If an implant with insufficient osseointegration characteristics is implanted into the human body, perfect osseointegration between the implant and bone may not be formed, which may lead to excessively prolonged treatment time or even failure.

[0010] As mentioned above, various surface treatment methods have been proposed as a method to improve the osseointegration characteristics of conventional implants, and research and development of surface treatment methods to further improve osseointegration characteristics are required.

[0011] [Prior Art Literature]

[0012] (Patent Document 0001) International Patent Publication No. WO 1997-029624 (Published on June 10, 1997)

[0013] The technical problem to be solved by the present invention is to provide a method for surface treatment of a dental implant, which can implement a surface topography that is equal to or more regular and uniform than the SLA surface treatment of a pure titanium implant while using pure titanium and a titanium alloy with improved mechanical strength as a material, and a dental implant surface-treated by the method.

[0014] According to one embodiment as a means of solving the problem, a method for treating the surface of a dental implant so as to have osseointegration topography on the surface is provided, comprising the steps of preparing a titanium-zirconium (Ti-Zr) implant body having external screw threads, a first surface treatment step of implementing a macro surface shape by sandblasting the outer surface of the implant body having external screw threads, and a second surface treatment step of implementing a micro surface on the surface of the implant body that has been surface-treated in the first step using an etching solution, wherein the surface treatment conditions in the second surface treatment step are that the etching time is 5 to 10 minutes, the etching temperature is 90 to 120°C, and any one selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, or a mixture of two or more selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, is used as the etching solution.

[0015] In one embodiment, the titanium-zirconium (Ti-Zr) implant body may preferably be a titanium-zirconium alloy including 14 to 16 parts by weight of zirconium (Zr) and 84 to 86 parts by weight of titanium (Ti), based on a total weight of 100.

[0016] According to another embodiment as a means of solving the problem, there is provided a method for treating the surface of a dental implant to have osseointegration topography on the surface, comprising the steps of: preparing an implant body having external screw threads and made of pure titanium or a titanium alloy material composed of titanium and aluminum (Al), silicon (Si), vanadium (V), niobium (Nb), zirconium (Zr), molybdenum (Mo), chromium (Cr), tin (Sn), tantalum (Ta), palladium (Pd), and a combination of one or more of these; a first surface treatment step of forming a grid pattern groove on the outer surface of the implant body having external screw threads using a laser; and a second surface treatment step of secondarily treating the surface of the implant body that has been surface-treated for the first time using an etching solution, wherein the surface treatment conditions in the second surface treatment step are: an etching time of 4 to 60 minutes, an etching temperature of A method for treating the surface of a dental implant is provided, wherein the etching solution is at 70 to 120°C and any one selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, or a mixture of two or more selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, is used as an etching solution.

[0017] And in another embodiment, the first surface treatment step may include a first laser treatment process for processing a plurality of first grooves that are continuous in a first direction and spaced apart in a second direction, and a second laser treatment process for processing a plurality of second grooves that are continuous in a second direction and spaced apart in the first direction to form a crater at each intersection of the first groove and the second groove.

[0018] Here, the crater formed on the outer surface of the implant body by the first laser processing process and the second laser processing process is preferably formed with a higher crater density in the outer lower screw thread portion than in the outer upper screw thread portion.

[0019] According to another embodiment as a means of solving the problem, a dental implant is provided that is implanted in alveolar bone to form an artificial tooth root, wherein an internal groove is formed from the upper surface to which an abutment for supporting a prosthesis is coupled at a specific depth, a screw thread for implantation into alveolar bone is formed on the outer surface, and the outer surface on which the screw thread is formed is surface-treated using a surface treatment method according to the above-described example and other embodiments, thereby providing a dental implant having osseointegration topography on the outer surface.

[0020] According to a method for surface treatment of a dental implant according to an embodiment of the present invention, while using pure titanium or a titanium alloy having superior mechanical properties compared to pure titanium as a material, the topography on the surface can be implemented in a shape equivalent to or more uniform than the surface topography of a pure titanium implant, thereby providing a dental implant having stable osseointegration characteristics.

[0021] Figure 1 is a process schematic diagram for explaining a dental implant surface treatment method according to one embodiment of the present invention.

[0022] Figures 2 and 3 are SEM images showing the surface condition of a Ti-15Zr implant body that was first surface treated by sandblasting after second surface treatment (etching treatment).

[0023] Figure 4 is a process schematic diagram for explaining a dental implant surface treatment method according to another embodiment of the present invention.

[0024] FIG. 5 is a schematic diagram illustrating a laser surface treatment process performed in a first surface treatment step in another embodiment of the present invention.

[0025] Figure 6 is a SEM image and cross-sectional schematic diagram showing the surface condition of an implant that has undergone a first surface treatment step in another embodiment of the present invention.

[0026] Figure 7 is a graph comparing the roughness of the implant body surface when surface treated only with a laser and when surface treated through hydrochloric acid + sulfuric acid etching (this example) after laser surface treatment.

[0027] Figure 8 is a front view of a dental implant according to another embodiment of the present invention.

[0028] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0029] The terminology used in this specification is for the purpose of describing specific embodiments only and is not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0030] In this specification, the terms “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but should be understood not to exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0031] Additionally, while terms such as "first," "second," etc. may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another.

[0032] In describing the present invention with reference to the attached drawings, identical components will be assigned identical reference numerals, and redundant descriptions thereof will be omitted. Furthermore, when describing the present invention, if a detailed description of a related known technology is deemed to unnecessarily obscure the gist of the present invention, such detailed description will be omitted.

[0033] The present invention relates to a method for treating the surface of a dental implant so that it has osseointegration topography on the surface. Here, the term 'dental implant' refers to a part that is implanted into the alveolar bone of the implant target area and serves as a pillar, that is, serves as an artificial tooth root, and after implantation, it fuses with the corresponding alveolar bone to generate a strong bonding force.

[0034] Figure 1 is a process schematic diagram for explaining a dental implant surface treatment method according to one embodiment of the present invention.

[0035] Referring to FIG. 1, a surface treatment method according to an embodiment of the present invention includes a step (S100) of preparing an implant body, a first surface treatment step (S200) of implementing a macro surface shape on the surface of the implant body (100) by sandblasting, and a second surface treatment step (S300) of implementing a micro surface on the surface of the implant body that has been first surface-treated by using an etching solution.

[0036] In the step (S100) of preparing the implant body, the implant body (100) is prepared through machining. Here, the implant body is formed with an internal groove formed from the upper surface to which an abutment supporting a prosthesis is to be joined at a specific depth, and has a screw thread on the outer surface that is to be joined to the bone of the implantation target area in a screw-fastening manner. Preferably, it may be in the form illustrated in FIG. 8.

[0037] In the step (S100) of preparing the implant body, the implant body (100) may be made of an alloy made by mixing zirconium (Zr) into titanium (Ti) at a specific ratio, i.e., a titanium-zirconium (Ti-Zr) alloy. Preferably, the implant body may be made of a titanium-zirconium alloy containing 14 to 16 parts by weight of zirconium (Zr) and 84 to 86 parts by weight of titanium (Ti) based on a total weight of 100.

[0038] When zirconium is mixed in an amount of less than 14 parts by weight per 100 parts by weight of the total, there is no significant difference in mechanical strength (tensile strength and fatigue strength) compared to pure titanium. When zirconium is mixed in an amount of more than 16 parts by weight per 100 parts by weight of the total, mechanical strength is greatly improved compared to pure titanium, but surface treatment in subsequent processes becomes difficult, biocompatibility is poor, and the possibility of side effects during the procedure greatly increases.

[0039] In the first surface treatment step (S200), the outer surface of the implant body (100) is primarily surface treated through sand blasting. In the first surface treatment step (S100), preferably, Al2O3, TiO2, Zr2O 3, The surface of an implant body machined under high pressure is roughened by evenly spraying amorphous ceramic powder such as hydroxyapatite. Here, the blasting pressure may be at least 1.5 bar under blasting conditions.

[0040] In the secondary surface treatment step (S200), a predetermined etching treatment is performed on the surface of the implant body (100) using an acidic etching solution. By this secondary surface treatment, a micro surface shape can be additionally implemented in addition to the macro surface shape implemented on the surface of the implant body (100) by sandblasting.

[0041] The surface treatment conditions in the second surface treatment step (S200) of secondarily treating the surface of the implant body that has been first surface treated using an etching solution are as follows: an etching time of 5 to 10 minutes, an etching temperature of 90 to 120°C, and any one selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, or a mixture of two or more selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, can be used as the etching solution.

[0042] The surface treatment conditions in the second surface treatment step are preferably, the etching time is 300 seconds (5 minutes), the etching temperature is 110°C, and a mixture of hydrochloric acid and sulfuric acid can be used as the etching solution.

[0043] Figures 2 and 3 are SEM images showing the surface condition after secondary surface treatment (etching treatment) of a Ti-15Zr (an alloy composed of 15 parts by weight of zirconium and the remainder of titanium based on 100 parts by weight of the total) implant body that was first surface treated through sandblasting. These are SEM images showing the surface condition when the surface was treated with an etching solution composed of hydrochloric acid and sulfuric acid at different etching times and temperatures.

[0044] First, looking at Figure 2, the results of performing surface treatment while changing the etching time to 5 minutes, 10 minutes, and 20 minutes while maintaining the etching temperature at 100℃ are shown. When the etching time is 5 minutes, the surface roughness is not uniform overall, and when the etching time is 20 minutes, the surface roughness is better than the result obtained when 5 minutes were performed, but it can be seen that etching is excessive compared to the result obtained when 10 minutes were performed.

[0045] And when looking at the surface treatment results (Fig. 3) when only the etching temperature was changed while keeping the etching time the same at 5 minutes, it can be seen that the roughness was formed more uniformly overall under the etching temperature condition of 110℃ compared to the etching temperature condition of 100℃. In particular, it can be seen that the surface treatment results under these conditions (etching time 5 minutes, etching temperature 110℃) are similar to the surface treatment results under the etching time 10 minutes, etching temperature 100℃ (see Fig. 2).

[0046] According to these test results, when performing secondary surface treatment (etching treatment) using an etching solution composed of hydrochloric acid and sulfuric acid, it can be seen that the treatment conditions are that when the etching temperature is 100°C, the etching time is preferably 10 minutes, and when the etching temperature is 110°C, the etching time is preferably 5 minutes.

[0047] However, considering the influence of etching time on the mass productivity of the product (a longer etching time may lower the mass productivity of the product), it is most desirable to perform etching treatment at an etching temperature of 110°C for 5 minutes.

[0048] Figure 4 is a process schematic diagram for explaining a dental implant surface treatment method according to another embodiment of the present invention.

[0049] Referring to FIG. 4, a surface treatment method according to another embodiment of the present invention includes a step of preparing an implant body (S100'), a step of primarily treating the surface of the implant body with a laser to provide a macro surface shape (S200'), and a step of secondarily treating the surface with an etching solution to provide a micro surface shape (S300').

[0050] In the step (S100') of preparing the implant body, the implant body (100) is prepared through machining. Here, the implant body may be in the form of an internal groove formed from the upper surface to which an abutment for supporting a prosthesis is to be coupled at a specific depth, a form integral with the abutment, a form in which an abutment for supporting a prosthesis is coupled above the upper surface, etc., and preferably, it may be in the form illustrated in FIG. 8.

[0051] In the step (S100') of preparing an implant body, the implant body may be made of (100), an alloy made by mixing zirconium (Zr) in titanium (Ti) at a specific ratio, i.e., a titanium-zirconium (Ti-Zr) alloy. The implant body (100) may preferably be made of a titanium-zirconium alloy containing 14 to 16 parts by weight of zirconium (Zr) and 84 to 86 parts by weight of titanium (Ti), based on a total weight of 100.

[0052] When zirconium is mixed in an amount of less than 14 parts by weight per 100 parts by weight of the total, there is no significant difference in mechanical strength (tensile strength and fatigue strength) compared to pure titanium. When zirconium is mixed in an amount of more than 16 parts by weight per 100 parts by weight of the total, mechanical strength is greatly improved compared to pure titanium, but surface treatment in subsequent processes becomes difficult, biocompatibility is poor, and the possibility of side effects during the procedure greatly increases.

[0053] In the surface treatment method according to another embodiment of the present invention, in the step (S100') of preparing an implant body, the implant body (100) may be a titanium alloy material composed of pure titanium or titanium and aluminum (Al), silicon (Si), vanadium (V), niobium (Nb), zirconium (Zr), molybdenum (Mo), chromium (Cr), tin (Sn), tantalum (Ta), palladium (Pd), or a combination of one or more of these.

[0054] More preferably, the implant body (100) may be made of pure titanium or a titanium-aluminum-vanadium (Ti-Al-V) series alloy or a titanium-zirconium (Ti-Zr) series alloy.

[0055] In the first surface treatment step (S200'), the outer surface of the implant body (100) is primarily surface treated using a laser. Preferably, the work of forming a regular pattern of grooves using a laser can be performed on all or part of the implant surface. Here, the regular pattern may be a grid pattern in which two groups of grooves arranged in different directions intersect each other at various angles, including right angles.

[0056] In the present embodiment, the first surface treatment step (S200') may specifically be composed of a first laser treatment process (S202') for processing a plurality of first grooves (hereinafter referred to as 'first groove groups') that are continuous in the first direction and spaced apart in the second direction, and a second laser treatment process (S204') for processing a plurality of second grooves (hereinafter referred to as 'second groove groups') that are continuous in the second direction and spaced apart in the first direction to form craters (Craters, c) at each intersection of the first grooves (g1) and the second grooves (g2).

[0057] In the present embodiment, the first direction may be the circumferential direction of the implant body, and the second direction may be the longitudinal direction of the implant body orthogonal to the first direction. Of course, the present invention is not limited thereto, and the first direction may be, for example, the same as or opposite to the direction in which screw threads are formed on the implant surface, and the second direction may be a direction obliquely inclined with respect to the first direction.

[0058] In performing primary surface treatment using a laser, the implant body (100) to be surface treated is placed in a rotating device (not shown), and as shown in the schematic diagram of the surface treatment shown in (a) of Fig. 5, a grid pattern groove can be formed by rotating the rotating divider and moving it forward and backward in the direction of the arrow with respect to a laser generator (200, equipment that irradiates a laser at a set intensity) which is a relatively fixed body.

[0059] Conversely, as shown in the surface treatment schematic diagram in (b) of Fig. 5, a grid pattern groove can be formed by rotating and moving a relatively movable laser generator (200, equipment that irradiates laser at a set intensity) in the direction of the arrow with respect to the implant (100) fixed to the fixed device while the implant (100) that is the target of surface treatment is fixed to a fixed device (not shown).

[0060] Fig. 6 is a SEM image and a cross-sectional schematic diagram showing the state of the implant surface after the first surface treatment step, wherein the first groove (g1) and the second groove (g2) can be preferably formed in a grid pattern that is orthogonal to each other. At this time, the width (w1) of the first groove (g1) and the width (w2) of the second groove (g2) can be the same (w1=w2), and the depth (d1) of the first groove (g1) and the depth (d2) of the second groove (g2) can also be formed to the same depth (d1=d2).

[0061] Here, it is preferable to understand that the width (w1) of the first groove (g1) and the width (w2) of the second groove (g2) mean the average widths of the grooves (g1) of the first groove group (G1) and the grooves (g2) of the second groove group (G2) formed in plurality, and it is also preferable to understand that the depth (d1) of the first groove (g1) and the depth (d2) of the second groove (g2) mean the average depths of the grooves (g1, g2) included in the corresponding groups.

[0062] The widths (w1, w2) of the first groove (g1) and the second groove (g2) may preferably be 1 to 100 μm. If the widths (w1, w2) of the first groove (g1) and the second groove (g2) formed in intersecting directions are less than 1 μm, the surface area increasing effect is minimal, which may result in a deterioration of the osseointegration characteristics. In addition, if the widths of the first groove (g1) and the second groove (g2) exceed 100 μm, the durability of the implant body may be deteriorated.

[0063] The depths (d1, d2) of the first groove (g1) and the second groove (g2) may preferably be 1 to 100 μm. If the depths (d1, d2) of the first groove (g1) and the second groove (g2) are less than 1 μm, the surface area increasing effect is minimal, and if the depths of the first groove (g1) and the second groove (g2) exceed 100 μm, the uniformity of the micro grooves (g3) formed on the surfaces of the first groove (g1) and the second groove (g2) through a subsequent secondary surface treatment step may deteriorate.

[0064] In the present embodiment, the distance (D1) between one first groove (g1) and another adjacent first groove (g1) is preferably 1 to 100 µm, considering the density of the crater (c) per unit area and the resulting osseointegration characteristics, and the distance (D2) between one second groove (g2) formed in a direction intersecting the first groove (g1) and another adjacent second groove (g2) is also preferably 1 to 100 µm.

[0065] In the secondary surface treatment step (S300'), a predetermined etching process is performed on the surface of the implant body using an acidic etching solution. By this secondary surface treatment, micro-sized micro-grooves are formed on the surface of each groove (g1, g2) formed on the surface of the implant body by the primary laser processing (see Fig. 4), thereby significantly increasing the overall surface area.

[0066] The surface treatment conditions in the second surface treatment step (S300') using an etching solution include an etching time of 4 to 60 minutes, an etching temperature of 70 to 120°C, and any one selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, or a mixture of two or more selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, may be used as the etching solution.

[0067] More preferably, the etching time is 7 to 13 minutes, the etching temperature is 100°C, and it is recommended to use a hydrochloric acid + sulfuric acid solution as the etching solution.

[0068] Fig. 7 is a graph comparing the roughness of the implant body surface when surface treated only with a laser and after performing laser treatment as the first surface treatment and hydrochloric acid + sulfuric acid etching as the second surface treatment (this example). It can be seen that the surface roughness significantly increased when surface treated with hydrochloric acid + sulfuric acid etching after laser treatment compared to when surface treated only with a laser, and that the surface roughness actually increased when the etching time was 5 minutes compared to when the etching time was 10 minutes.

[0069] For reference, among the numbers described in Fig. 7, the numbers in mm / s represent the laser processing speed, and the numbers in ㎛ represent the depth of the groove formed through laser processing (corresponding to d1 and d2 in the preceding Fig. 6).

[0070] When implants are placed, osseointegration properties, which are the bonding properties between the implant and bone, improve as the surface area of ​​the dental implant increases, provided the implant size remains the same. Furthermore, surface area increases as surface roughness increases. In this regard, the graph in Fig. 7 supports the interpretation that the surface treatment method according to this embodiment (laser treatment followed by hydrochloric acid + sulfuric acid etching) clearly improves osseointegration performance.

[0071] According to the dental implant surface treatment method according to the embodiment of the present invention as described above, while using a titanium alloy (titanium-zirconium) having superior mechanical properties compared to pure titanium as a material, the topography on the surface can be implemented to be equal to or better than the surface topography of a pure titanium implant, thereby providing a dental implant having stable osseointegration characteristics.

[0072] Fig. 8 is a front view of a dental implant surface-treated by the surface treatment method described above.

[0073] Referring to FIG. 8, a dental implant (100) according to another aspect of the present invention is a structure that is implanted into alveolar bone to form an artificial tooth root, and may include an outer surface (101) on which an external screw thread (103) is formed for implantation into alveolar bone.

[0074] Here, the outer surface (101) on which the external screw thread (103) is formed can be surface-treated through a first laser treatment process for processing a plurality of first grooves that are continuous in the first direction and spaced apart in the second direction, and a second laser treatment process for processing a plurality of second grooves that are continuous in the second direction and spaced apart in the first direction to form craters at each intersection of the first groove and the second groove.

[0075] The implant (100) according to the present embodiment may be made of a titanium alloy in which zirconium (Zr) accounts for 14 to 16 weight parts and the remainder is titanium (Ti) based on the total weight of 100, and the outer surface (101) may be surface-treated using the surface treatment method described above, thereby having an osseointegration topography that can promote rapid and strong osseointegration with bone (alveolar bone).

[0076] In particular, when using a technique of performing primary surface treatment with a laser among the aforementioned surface treatment methods and secondary surface treatment with an etching solution containing a mixture of hydrochloric acid and sulfuric acid, in forming a crater (a groove formed at the point where the first groove and the second groove intersect in FIG. 6 above) through laser processing, it is preferable that the outer lower thread section (104) have a higher crater density than the outer upper thread section (106) (see enlarged image of the main part in FIG. 8).

[0077] In this way, by increasing the crater density of the outer lower thread section (104) compared to the outer upper thread section (106), that is, by configuring the outer lower thread section to have a rougher surface compared to the outer upper thread section, the bacterial growth inhibition effect and osseointegration characteristics can be improved in a more balanced manner.

[0078] The detailed description of the present invention above has described only specific embodiments thereof. However, it should be understood that the present invention is not limited to the specific embodiments described in the detailed description, but rather encompasses all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention as defined by the appended claims.

[0079] [Explanation of symbols]

[0080] 100: Implant

[0081] 101: Outer surface

[0082] 103: External thread

[0083] 104: External lower thread section

[0084] 106: External top thread section

[0085] g1: first groove

[0086] g2: second groove

[0087] c: Crater

Claims

1. A method for treating the surface of a dental implant to have osseointegration topography on the surface, A step of preparing a pure titanium or titanium-zirconium (Ti-Zr) implant body with external screw threads; A first surface treatment step in which the outer surface of the implant body having external screw threads is first treated by sand blasting; and It includes a second surface treatment step of performing a second treatment on the surface of the implant body that has been first surface treated using an etching solution; In the above second surface treatment step, the surface treatment conditions are: The etching time is 5 to 10 minutes, and the etching temperature is 90 to 120℃. A method for surface treatment of a dental implant using as an etching solution any one selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, or a mixture of two or more selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide.

2. In paragraph 1, The above titanium-zirconium (Ti-Zr) implant body is, Based on a total weight of 100, Zirconium (Zr) 14 to 16 parts by weight, A method for surface treatment of a dental implant, the method comprising: a titanium-zirconium alloy containing 84 to 86 parts by weight of titanium (Ti).

3. A method for treating the surface of a dental implant to have osseointegration topography on the surface, A step for preparing an implant body having external threads and made of pure titanium, or a titanium alloy material comprising titanium and aluminum (Al), silicon (Si), vanadium (V), niobium (Nb), zirconium (Zr), molybdenum (Mo), chromium (Cr), tin (Sn), tantalum (Ta), palladium (Pd), and a combination of one or more of these; A first surface treatment step of forming a grid pattern groove on the outer surface of the implant body having external screw threads using a laser; It includes a second surface treatment step of performing a second treatment on the surface of the implant body that has been first surface treated using an etching solution; In the above second surface treatment step, the surface treatment conditions are: The etching time is 4 to 60 minutes, and the etching temperature is 70 to 120℃. A method for surface treatment of a dental implant using as an etching solution any one selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide, or a mixture of two or more selected from hydrochloric acid, sulfuric acid, phosphoric acid, nitric acid, hydrofluoric acid, and hydrogen peroxide.

4. In paragraph 3, The above titanium-zirconium (Ti-Zr) implant body is, Based on a total weight of 100, Zirconium (Zr) 14 to 16 parts by weight, A method for surface treatment of a dental implant, the method comprising: a titanium-zirconium alloy containing 84 to 86 parts by weight of titanium (Ti).

5. A method for treating the surface of a dental implant to have osseointegration topography on the surface, A step of preparing an implant body made of pure titanium, or a titanium alloy material composed of titanium and aluminum (Al), silicon (Si), vanadium (V), niobium (Nb), zirconium (Zr), molybdenum (Mo), chromium (Cr), tin (Sn), tantalum (Ta), palladium (Pd), and a combination of one or more of these; A first surface treatment step of forming a grid pattern groove on the outer surface of the implant body having external screw threads using a laser; It includes a second surface treatment step of performing a second treatment on the surface of the implant body that has been first surface treated using an etching solution; The above first surface treatment step is, A first laser processing process for processing a plurality of first grooves that are continuous in the first direction and spaced apart in the second direction, A method for surface treatment of a dental implant, comprising a second laser treatment process for forming a crater at each intersection of the first groove and the second groove by processing a plurality of second grooves that are continuous in the second direction and spaced apart in the first direction.

6. In paragraph 5, A method for surface treatment of a dental implant, wherein the density of the crater formed on the outer surface of the implant body through a first laser treatment process and a second laser treatment process is made higher in the outer lower screw thread portion than in the outer upper screw thread portion.

7. A dental implant that is implanted into the alveolar bone to form an artificial tooth root. An internal groove is formed from the upper surface to which an abutment for supporting the prosthesis is joined at a certain depth, The outer surface is provided with screw threads for implanting alveolar bone. A dental implant having an outer surface on which threads are formed and having an osseointegration topography on the outer surface by being surface-treated using any one of the surface treatment methods described in any one of claims 1 to 6.

Images