Tantalum coating dental implant and surface processing technology

Abstract

The invention provides a tantalum coating dental implant which is of an integrated structure and comprises an upper part, a middle part and a lower part, neck threads are arranged on the circumferential surface of the upper part, trapezoidal threads are arranged on the circumferential surfaces of the middle part and the lower part, and a self-tapping groove is further formed in the circumferential surface of the lower part; a thread-shaped surface groove is also formed in the trapezoidal thread; a hexagonal hole is formed in the top of the dental implant, a threaded hole is further formed in the bottom of the hexagonal hole, and the hexagonal hole and the threaded hole form an inner cavity stepped hole. The tantalum coating is applied to the surface of the titanium alloy, so that the mechanical strength of a matrix is guaranteed, physical shielding is formed, and release of toxic elements is prevented; the tantalum coating significantly improves the antibacterial performance and osteogenic activity of the titanium implant, and can promote adhesion, vitality, proliferation and migration of human gingival fibroblasts.

Description

Technical Field

[0001] The present invention belongs to the field of dental implants, and particularly relates to a tantalum-coated dental implant and a surface processing technology. Background Art

[0002] A dental implant is an artificial tooth root, usually made of biocompatible materials, and surgically implanted into the alveolar bone to support dentures or dental crowns. Commonly used materials are pure titanium TA4G (accounting for 70%) and titanium alloy TC4 (accounting for 26%).

[0003] The surface treatment of implants is a key process to promote rapid osteogenesis after implanting. The surface treatment methods of implants include titanium plasma spraying, hydroxyapatite thermal spraying, anodic oxidation, laser melting, water bath penetration, plasma spraying, magnetron sputtering, sandblasting and acid etching, etc. The commonly used methods are sandblasting and acid etching, and hydroxyapatite thermal spraying.

[0004] Although pure titanium TA4G has excellent biocompatibility, almost no cytotoxicity, strong bone integration ability, and high long-term implant stability, the mechanical strength of the material is relatively low and there is a risk of fracture; titanium alloy TC4 has high mechanical strength, but trace element vanadium in it may release ions and there is slight cytotoxicity, and aluminum may be related to long-term neurotoxicity. And the elastic modulus of pure titanium and titanium alloy is about 110 GPa, which is higher than that of cortical bone (10 - 30 GPa), and it is easy to cause "stress shielding", and long-term implantation is easy to cause bone resorption.

[0005] Ordinary implants are sandblasted to form primary pores on the surface of dental implants by sandblasting, and then strong acid is used to corrode the surface to form secondary pores. Through surface treatment, a micro-nano composite nested multi-level pore structure morphology is constructed, which is a multi-dimensional structure suitable for the attachment of osteoblasts and fibrinogen, etc. By using the chimerism of bone binding on the surface, bone healing is accelerated, the bioactivity of the implant surface is improved, the bone binding area of the implant is increased, and the bonding strength between the implant and the bone interface is improved, thereby improving the long-term stability of the implant. Although it meets the basic requirements of clinical implantation, with the clinical pursuit of osteogenesis efficiency and long-term implant effects, the strength and osteogenesis effect of narrow-neck implants in the anterior tooth area still need to be improved, there is a lack of effective intervention methods for the reaction of oral inflammation, and it cannot play an isolation role in the long-term ion precipitation of metals. The ordinary design and process treatment need to achieve a breakthrough leap. The surface treatment of hydroxyapatite thermal spraying, although it has certain help in osteogenesis, has large internal stress in the coating, which may lead to cracking, the coating does not fall off, ion precipitation, and there are large long-term implantation risks. Summary of the Invention

[0006] In view of this, the present invention aims to propose a tantalum-coated dental implant and a surface processing technology to solve the above problems.

[0007] To achieve the above object, the technical solution of the present invention is implemented as follows:

[0008] A tantalum-coated dental implant, which is an integral structure, includes an upper part, a middle part and a lower part. The circumferential surface of the upper part is provided with a neck thread, the circumferential surfaces of the middle part and the lower part are provided with trapezoidal threads, and the circumferential surface of the lower part is also provided with a self-tapping groove;

[0009] The trapezoidal thread is also provided with a tooth profile groove;

[0010] The top of the dental implant is provided with a hexagonal hole, and the bottom of the hexagonal hole is also provided with a threaded hole. The hexagonal hole and the threaded hole form an inner cavity stepped hole.

[0011] Further, the upper part is integrally in an inverted cone shape, its neck thread is a horizontal micro-thread and is also a trapezoidal thread; the top of the upper part is provided with a chamfer.

[0012] Further, the tooth profile groove of the middle part is arranged on the lower side of the trapezoidal thread of the middle part;

[0013] The cross-section of the tooth profile groove is an acute triangle; sides a and b are respectively formed. The plane where side a is located is parallel to the axis of the dental implant, and the included angle between side b and side a is 30°-40°.

[0014] Further, an arc transition is provided between side a and side b.

[0015] Further, the number of the self-tapping grooves is 4, and they are evenly arranged on the circumferential surface of the lower part of the dental implant.

[0016] Further, the middle part is integrally in a cylindrical structure, and the lower part is integrally in a conical structure.

[0017] Further, the height ratio range of the middle part to the lower part is 5:4-5:3; the height ratio range of the upper part to the middle part is 1:4-1:5.

[0018] Further, both the upper end face and the lower end face of the dental implant are flat surfaces.

[0019] A surface processing process for a tantalum-coated dental implant includes the following steps:

[0020] S1. Sandblasting: The dental implant is sandblasted. The sandblasting medium is 80-mesh zirconia, the sandblasting pressure is 0.3-0.5 Mpa, the rotation speed is 50 r / min, the time is 4 s, and the distance between the product and the nozzle is 10-15 mm;

[0021] S2. Cleaning: Ultrasonic cleaning is carried out with purified water. The ultrasonic frequency is 50 Hz, the water temperature is 75-85 °C, and the cleaning time is 30 min;

[0022] S3, Acid etching; the acid etching solution is a mixture of concentrated sulfuric acid, concentrated hydrochloric acid and deionized water, with a mixing ratio of H2SO4:HCL:H2O = 2:1:7, for 30 minutes at a temperature of 70 °C;

[0023] S4, Cleaning; ultrasonic cleaning is carried out with purified water, the ultrasonic frequency is 40 Hz, the water temperature is 75 - 85 °C, the cleaning time is 30 minutes, and the number of cleaning times is 1;

[0024] S5, Drying; the drying equipment is a forced air drying oven, at a temperature of 80 °C for 40 minutes;

[0025] S6, Magnetron sputtering; using metal target titanium as a transition, with a bias voltage of 65 V, for 7 minutes of transition, with a thickness of 0.05 - 0.07 mm. First, a titanium coating is formed on the surface of the implant, and then the metal target tantalum is sputtered as the final surface coating on the product surface, with a bias voltage of 65 V, for 7 minutes of transition, with a thickness of 0.05 - 0.07 mm.

[0026] Further, during magnetron sputtering, the upper part and the inner cavity of the dental implant are shielded and protected.

[0027] Compared with the prior art, the tantalum-coated dental implant and the surface processing technology of the present invention have the following advantages:

[0028] (1) For the tantalum-coated dental implant and the surface processing technology of the present invention, applying the tantalum coating to the titanium alloy surface not only ensures the mechanical strength of the substrate but also forms a physical shield to prevent the release of toxic elements; the tantalum coating significantly improves the antibacterial performance and osteogenic activity of the titanium implant, and the tantalum coating can also promote the adhesion, viability, proliferation and migration of human gingival fibroblasts.

[0029] (2) For the tantalum-coated dental implant and the surface processing technology of the present invention, using the target metal titanium for transition during magnetron sputtering is beneficial for the attachment of the tantalum target and increases the bonding strength with the body. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0031] Figure 1 is a three-dimensional schematic diagram of a tantalum-coated dental implant according to an embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of a tantalum-coated dental implant according to an embodiment of the present invention;

[0033] Figure 3 is according to an embodiment of the present invention Figure 2The enlarged view of the part marked with A;

[0034] Figure 4 This is the bottom view of a tantalum-coated dental implant according to an embodiment of the present invention.

[0035] Explanation of reference numerals:

[0036] 1. Upper part; 11. Neck thread; 2. Middle part; 3. Lower part; 4. Trapezoidal thread; 5. Tooth profile groove; 6. Self-tapping groove. Detailed implementation mode

[0037] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0040] The present invention will be described in detail below with reference to the drawings and in combination with embodiments.

[0041] A tantalum-coated dental implant, as Figures 1 - 4 shown, is an integral structure, including an upper part, a middle part and a lower part. The circumferential surface of the upper part is provided with a neck thread, the circumferential surfaces of the middle part and the lower part are provided with trapezoidal threads, and the circumferential surface of the lower part is further provided with a self-tapping groove; the self-tapping groove provides self-tapping property during the implantation process, which facilitates the implantation process;

[0042] The trapezoidal thread is also provided with a thread flank groove;

[0043] The top of the dental implant is provided with a hexagon hole, and a threaded hole is also provided at the bottom of the hexagon hole. The hexagon hole and the threaded hole form an inner cavity stepped hole.

[0044] Preferably, the upper part is integrally in an inverted cone shape, its neck thread is a horizontal micro-thread and is also a trapezoidal thread; a chamfer is provided at the top of the upper part;

[0045] The micro-thread of the upper part reduces the cortical bone pressure and at the same time increases the bone contact area; the smooth chamfered neck ring of the upper part increases the platform transfer width and provides good attachment conditions for the attachment of soft tissues.

[0046] Preferably, the thread flank groove of the middle part is arranged on the lower side of the trapezoidal thread in the middle part; the thread flank groove is convenient for blood storage and provides better osteogenesis conditions while increasing the contact area.

[0047] The cross-section of the thread flank groove is an acute triangle; sides a and b are respectively formed, the plane where side a is located is parallel to the axis of the dental implant, and the included angle between side b and side a is 30°-40°.

[0048] Preferably, an arc transition is provided between side a and side b.

[0049] Preferably, the number of the self-tapping grooves is 4, and they are evenly arranged on the circumferential surface of the lower part of the dental implant.

[0050] Preferably, the middle part is integrally in a cylindrical structure, and the lower part is integrally in a conical structure; the conical surface of the lower part ensures that the implant can obtain good initial stability; the cylindrical surface of the middle part ensures that the implant has a larger contact area with the bone tissue; the inverted cone of the upper part reduces the cortical bone pressure and leaves a larger osteogenesis space.

[0051] Preferably, the height ratio range of the middle part to the lower part is 5:4 - 5:3; the height ratio range of the upper part to the middle part is 1:4 - 1:5.

[0052] Preferably, both the upper end face and the lower end face of the dental implant are flat; the flat bottom design increases the self-tapping property of the product itself and can also provide the function of implant redirection.

[0053] A surface processing process for a tantalum-coated dental implant includes the following steps:

[0054] S1. Sandblasting: The dental implant is sandblasted. The sandblasting medium is 80-mesh zirconia, the sandblasting pressure is 0.3 - 0.5 Mpa, the rotation speed is 50 r / min, the time is 4 s, and the distance between the product and the nozzle is 10 - 15 mm; the oil stains, impurities and oxide layer on the surface of the implant are removed to ensure the effectiveness of subsequent treatment;

[0055] S2. Cleaning: Ultrasonic cleaning is carried out with purified water. The ultrasonic frequency is 50 Hz, the water temperature is 75 - 85 °C, and the cleaning time is 30 min. Through high-temperature ultrasonic vibration, the zirconia particles and debris remaining on the surface after sandblasting are completely removed. The warm water at 75 - 85 °C accelerates the decomposition of surface organic substances, creating a clean substrate environment for acid etching, avoiding impurity interference with subsequent acid etching and sputtering processes, and improving the coating uniformity.

[0056] S3. Acid etching: The acid etching solution is a mixture of concentrated sulfuric acid, concentrated hydrochloric acid and deionized water, with a mixing ratio of H2SO4:HCL:H2O = 2:1:7, a time of 30 min, and a temperature of 70 °C.

[0057] S4. Cleaning: Ultrasonic cleaning is carried out with purified water. The ultrasonic frequency is 40 Hz, the water temperature is 75 - 85 °C, the cleaning time is 30 min, and the number of cleaning times is 1 time.

[0058] S5. Drying: The drying equipment is a forced-air drying oven, with a temperature of 80 °C and a time of 40 min, providing a dry and stable substrate surface for subsequent magnetron sputtering.

[0059] S6. Magnetron sputtering: Metal target titanium is used as a transition, with a bias voltage of 65 V and a transition time of 7 minutes, and a thickness of 0.05 - 0.07 mm. First, a titanium coating is formed on the surface of the implant, and then metal target tantalum is sputtered as the final surface coating on the product surface, with a bias voltage of 65 V and a transition time of 7 minutes, and a thickness of 0.05 - 0.07 mm.

[0060] Using metal target titanium as a transition in magnetron sputtering is beneficial for the adhesion of tantalum target, increasing the bonding strength with the body.

[0061] Preferably, during magnetron sputtering, the upper part and inner cavity of the dental implant are shielded and protected.

[0062] For dental implants, on the basis of the sandblasting and acid etching process on the surface, a magnetron sputtering tantalum coating process is added. The magnetron sputtering process coating is dense, has high purity, and strong adhesion. It is suitable for preparing ultra-thin and uniform films. The coating process parameters are easy to control, and the long-term stability is not easy to fall off.

[0063] The tantalum coating can significantly improve the antibacterial performance and osteogenic activity of titanium implants by improving the surface characteristics of titanium implants. The tantalum coating can also promote the adhesion, viability, proliferation and migration of human gingival fibroblasts, indicating the application potential of the tantalum coating in the transmucosal part.

[0064] The tantalum coating can prevent the release of toxic elements and improve the biocompatibility of metal materials, which is particularly important in the application of oral implants.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A tantalum-coated dental implant, characterized in that: It is an integral structure, including an upper part, a middle part and a lower part. The circumferential surface of the upper part is provided with a neck thread, the circumferential surfaces of the middle part and the lower part are provided with trapezoidal threads, and the circumferential surface of the lower part is also provided with a self-tapping groove; The trapezoidal thread is also provided with a tooth profile surface groove; The top of the dental implant is provided with a hexagonal hole, and the bottom of the hexagonal hole is also provided with a threaded hole. The hexagonal hole and the threaded hole form an inner cavity stepped hole.

2. The tantalum-coated dental implant according to claim 1, characterized in that: The upper part is integrally in an inverted cone shape. Its neck thread is a horizontal micro-thread and is also a trapezoidal thread; the top end of the upper part is provided with a chamfer.

3. A tantalum-coated dental implant according to claim 1, characterized in that: The tooth profile surface groove of the middle part is arranged on the lower side of the trapezoidal thread of the middle part; The cross-section of the tooth profile surface groove is an acute triangle; sides a and b are respectively formed. The surface where side a is located is parallel to the axis of the dental implant, and the included angle between side b and side a is 30° - 40°.

4. A tantalum-coated dental implant according to claim 3, characterized in that: There is an arc transition between side a and side b.

5. A tantalum-coated dental implant according to claim 1, wherein: The number of the self-tapping grooves is 4, and they are evenly arranged on the circumferential surface of the lower part of the dental implant.

6. A tantalum-coated dental implant according to claim 1, wherein: The middle part is integrally in a cylindrical structure, and the lower part is integrally in a conical structure.

7. A tantalum-coated dental implant according to claim 6, characterized in that: The height ratio range of the middle part and the lower part is 5:4 - 5:3; the height ratio range of the upper part and the middle part is 1:4 - 1:

5.

8. A tantalum-coated dental implant according to claim 1, characterized in that: Both the upper end face and the lower end face of the dental implant are planes.

9. A surface processing technology for a tantalum-coated dental implant according to any one of claims 1-8, characterized in that: It includes the following steps: S1. Sandblasting: The dental implant is sandblasted. The sandblasting medium is 80-mesh zirconia, the sandblasting pressure is 0.3 - 0.5 Mpa, the rotation speed is 50 r / min, the time is 4 s, and the distance between the product and the nozzle is 10 - 15 mm; S2. Cleaning: Ultrasonic cleaning is carried out with purified water. The ultrasonic frequency is 50 Hz, the water temperature is 75 - 85 °C, and the cleaning time is 30 min; S3. Acid etching: The acid etching solution is a mixture of concentrated sulfuric acid, concentrated hydrochloric acid and deionized water. The mixing ratio is H2SO4:HCL:H2O = 2:1:7, the time is 30 min, and the temperature is 70 °C; S4. Cleaning: Ultrasonic cleaning is carried out with purified water. The ultrasonic frequency is 40 Hz, the water temperature is 75 - 85 °C, the cleaning time is 30 min, and the cleaning times is 1 time; S5. Drying: The drying equipment is a blast drying oven, the temperature is 80 °C, and the time is 40 min; S6. Magnetron sputtering: Titanium is used as a transition with a metal target, the bias voltage is 65 V, and a 7-minute transition is adopted with a thickness of 0.05 - 0.07 mm. First, a titanium coating is formed on the surface of the implant, and then tantalum is used as the final surface coating with a metal target and sputtered on the surface of the product. The bias voltage is 65 V, and a 7-minute transition is adopted with a thickness of 0.05 - 0.07 mm.

10. A surface processing technology for a tantalum-coated dental implant according to claim 9, characterized in that: During magnetron sputtering, the upper part and the inner cavity of the dental implant are shielded and protected.

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