Porous tantalum dental implant for optimizing jaw connection stability and preparation method thereof

Abstract

The invention relates to the related technical field of dental implants, and discloses a porous tantalum dental implant for optimizing jaw connection stability and a preparation method thereof.The porous tantalum dental implant comprises a dental crown part, an abutment part and a tooth root part, a threaded part is arranged on the outer wall of the tooth root part, and the tooth root part is of a three-dimensional gradient porous structure microcosmically; the tooth root part and the abutment part are formed by a pure tantalum material, the tooth root part is provided with an inner cavity with an upward opening, the opening of the inner cavity is provided with a lower conical inner wall, the tooth crown part is provided with a positioning groove, the inner wall of the positioning groove is provided with an upper conical inner wall, and the abutment part comprises an upper positioning conical part and a lower positioning conical part which are sequentially connected; a plurality of first elastic cone plates which are circumferentially spaced are arranged on the outer wall of the upper positioning cone part, and a plurality of second elastic cone plates which are circumferentially spaced are arranged on the outer wall of the lower positioning cone part, so that the impact between the dental crown part and the abutment part is reduced, and the stability of connection among the dental crown part, the abutment part and the tooth root part is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field related to dental implants, and more specifically, particularly relates to a porous tantalum dental implant for optimizing jawbone connection stability and a preparation method thereof. Background Art

[0002] Implant restoration has become a conventional treatment method for the restoration of missing teeth in the mouth due to its many advantages and reliable clinical effects. Currently, most of the implants used in clinical practice are pre-formed dense cylindrical or conical titanium implants. However, relevant studies have shown that titanium and titanium-based alloy implants have the following three defects: First, the dense structure of the implant does not match the elastic modulus of the jawbone, which can easily produce a stress shielding effect, causing the implant to loosen and fall off; second, titanium and titanium-based alloys are bioinert metals with a serious lack of bone integration ability, making it difficult to achieve early bone integration at the implant-bone interface; third, long-term implantation of alloy implants poses a risk of precipitation of toxic ions such as Al and V, which can endanger human health.

[0003] Tantalum metal has become the most promising alternative to titanium implants due to its good biocompatibility, suitable biomechanical properties and excellent biological activity.

[0004] The prior art also has the following defects for cleaning belts: Existing dental implants consist of three parts: a crown, a base, and a heel. The three are connected by threaded fixings, and no relevant impact protection devices are provided. We know that when a dental implant is subjected to a distance impact, the dental implant will directly apply the impact to the dental bone, posing a risk of damaging the dental bone. If the dental bone or dental implant is deformed or broken, the stability of the dental implant connected to the dental bone after the impact will be greatly affected.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a porous tantalum dental implant and a preparation method thereof that optimizes the stability of the jaw connection are provided, in order to achieve a more practical purpose. Summary of the invention

[0006] The present invention provides a porous tantalum dental implant for optimizing jawbone connection stability and a preparation method thereof, which are used to overcome the above-mentioned defects in the prior art.

[0007] The purpose and efficacy of the porous tantalum dental implant for optimizing the stability of the jawbone connection and the preparation method thereof are achieved by the following specific technical means: A porous tantalum dental implant that optimizes the stability of the connection with the jawbone comprises a crown portion, a base portion and a root portion, wherein a threaded portion is arranged on the outer wall of the root portion, the root portion has a three-dimensional gradient porous structure at a microscopic level, the root portion and the base portion are formed of pure tantalum material, the root portion has an inner cavity opening upward, the inner cavity opening has a lower conical inner wall, the crown portion has a positioning groove, the inner wall of the positioning groove has an upper conical inner wall, the base portion comprises an upper positioning cone portion and a lower positioning cone portion connected in sequence, the upper positioning cone portion cooperates with the upper conical inner wall, the lower positioning cone cooperates with the The lower conical inner wall cooperates, and the outer wall of the upper positioning cone is provided with a plurality of circumferentially spaced first elastic cone plates, and a first hydraulic gap is formed between the first elastic cone plate and the outer wall surface of the upper positioning cone. The outer wall of the lower positioning cone is provided with a plurality of circumferentially spaced second elastic cone plates, and a second hydraulic gap is formed between the second elastic cone plate and the outer wall of the lower positioning cone. A power chamber for accommodating liquid and high-pressure gas is provided in the root part, and a liquid flow channel is provided on the root part, and the liquid flow channel connects the power chamber, the first hydraulic gap and the second hydraulic gap in sequence.

[0008] According to a further technical solution, a grid tube is arranged inside the root part, the inner wall of the grid tube is recessed to form a strip groove extending along the axial direction of the grid tube, and a plurality of strip grooves are distributed on the inner wall of the grid tube at circumferential intervals.

[0009] A further technical solution is that a pressure relief cylinder is slidably arranged inside the grid cylinder, the base part is connected inside the pressure relief cylinder, the bottom of the pressure relief cylinder blocks the inner cavity of the tooth root part to form a power cavity, an air passing groove connected to the power cavity is opened at the bottom of the pressure relief cylinder, a high-pressure air cavity is provided inside the pressure relief cylinder, an elastic reset part and a piston part are slidably arranged in the high-pressure air cavity, the piston part squeezes the elastic reset part and approaches the power cavity so that the air in the high-pressure air cavity is squeezed into the power cavity.

[0010] A further technical solution is that the inner wall of the top opening of the pressure relief cylinder has a lower conical inner wall, the lower conical inner wall is a smooth conical surface, and a hydraulic through hole is opened in the wall of the pressure relief cylinder. The hydraulic through hole is aligned with the gap between two adjacent second elastic cone plates. The liquid flowing out of the power chamber flows through the strip groove, the hydraulic through hole and enters the first hydraulic gap to form a liquid flow channel.

[0011] According to a further technical solution, the base portion also includes a connecting ring, the upper positioning cone portion and the lower positioning cone portion are respectively connected to both sides of the connecting ring, a first guide gap is formed between two adjacent first elastic cone plates, and a second guide gap is formed between two adjacent second elastic cone plates, and a through hole is arranged on the connecting ring, and two openings of the through hole respectively connect the first guide gap and the second guide gap.

[0012] According to a further technical solution, the tooth root also includes a limit ring, the lower wall of the limit ring abuts against the upper wall of the pressure relief cylinder to limit the pressure relief cylinder from leaving the inner cavity of the tooth root, and a sealing rubber ring is arranged between the lower wall of the limit ring and the upper wall of the pressure relief cylinder.

[0013] According to a further technical solution, the base portion extends toward the inner cavity of the tooth root portion to form a cylindrical convex body, an external thread is arranged on the outer circumference of the cylindrical convex body, the inner wall of the pressure relief cylinder has an internal thread matching the external thread, and the bottom of the cylindrical convex body abuts against the piston member.

[0014] According to a further technical solution, the crown portion is provided with a through connection hole which passes through the crown portion from top to bottom, the base portion has a threaded connection hole which is aligned with the connection hole, and a screw which fixes the crown portion to the base portion is arranged in the through connection hole.

[0015] A further technical solution is that the root of the tooth is divided into two layers of gradient pores from the center to the periphery, the pore size of the layer close to the center is 150-300μm, and the pore size of the layer far from the center is 550-650μm.

[0016] A method for preparing a porous tantalum dental implant, comprising the above-mentioned porous tantalum dental implant, comprises the following steps: S1: Scan the patient's mandibular bone structure, and use modeling software to build a customized 3D model of tantalum dental implants based on the patient's bone structure scan model.

[0017] S2: Use algorithms to configure the three-dimensional gradient porous structure of the tooth root.

[0018] S3: Using laser melting additive manufacturing technology, porous tantalum dental implant models were additively manufactured using medical tantalum alloy powder as raw material.

[0019] S4: A Ta2O5 nanotube layer was formed on the root surface using micro-arc oxidation technology and alkali pretreatment technology.

[0020] Compared with the prior art, the present invention has the following beneficial effects: In a porous tantalum dental implant for optimizing the stability of the jaw connection of the present invention, a power chamber is arranged at the root of the tooth, and a first elastic cone plate and a second elastic cone plate are arranged on the base portion. When the user uses the implant with a force exceeding a set value, the pressure acting on the crown portion squeezes the base portion downward. Due to the existence of the first elastic cone plate and the first hydraulic gap on the base portion, the impact on the crown portion is transmitted to the first elastic cone plate on the base portion, and the first elastic cone plate is deformed under pressure to squeeze the first hydraulic gap. The liquid in the first hydraulic gap flows back to the power chamber through the liquid flow channel, and the high-pressure gas in the power chamber is squeezed, thereby achieving a buffering effect. When the impact on the base part is transmitted to the root part, the impact is first transmitted to the second elastic cone plate, and the second elastic cone plate is deformed under pressure to squeeze the second hydraulic gap. The liquid in the second hydraulic gap returns to the power chamber through the liquid flow channel, and the gas therein is further squeezed, which has a further buffering effect. Through the above-mentioned double shock-absorbing and buffering, the impact between the crown part and the base part can be reduced, the impact between the base part and the root part can be reduced, and the permanent deformation of the base part and the root part at the contact point can be reduced, thereby improving the stability of the connection between the crown part, the base part and the root part.

[0021] A porous tantalum dental implant for optimizing the stability of the jaw connection of the present invention is provided with an upper positioning cone and a lower positioning cone on the base portion, a conical surface fit is formed between the crown portion and the base portion through the upper positioning cone and the upper conical inner wall, and a conical surface fit is also formed between the base portion and the root portion through the lower positioning cone and the lower conical inner wall. Since the conical surface fit has a self-positioning effect, when the crown portion is subjected to a severe impact, a short gap is formed between the crown portion, the base portion and the root portion to mitigate the impact, and the three are pushed back to the initial position quickly and accurately under the action of the high-pressure gas in the power chamber. The implant has a good ability to maintain position accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the overall structure disassembly diagram of the present invention.

[0023] Figure 2 The present invention Figure 1 Front view of .

[0024] Figure 3 1 is a cross-sectional view of the tooth crown portion 10 of the present invention.

[0025] Figure 4 It is a cross-sectional view of the base portion 11 of the present invention.

[0026] Figure 5 It is a cross-sectional view of the tooth root of the present invention.

[0027] Figure 6 It is a schematic structural diagram of the grid tube 24 and the pressure relief tube 26 of the present invention.

[0028] Figure 7 It is a disassembled view of the base portion 11 of the present invention.

[0029] Figure 8 The present invention Figure 7 A schematic structural diagram of the middle and lower positioning cone 18.

[0030] Fig. 9 The present invention Figure 7 Schematic diagram of the structure of the connecting ring 32.

[0031] Description of reference numerals: 10 crown portion, 11 base portion, 12 root portion, 13 threaded portion, 14 lower conical inner wall, 15 positioning groove, 16 upper conical inner wall, 17 upper positioning cone portion, 18 lower positioning cone portion, 19 first elastic cone plate, 20 first hydraulic gap, 21 second elastic cone plate, 22 second hydraulic gap, 23 power chamber, 24 grid tube, 25 strip groove, 26 pressure relief tube, 27 air passing groove, 28 high pressure air chamber, 29 elastic reset member, 30 piston member, 31 hydraulic through hole, 32 connecting ring, 33 through hole, 34 circular groove, 35 annular groove, 36 threaded connecting column, 37 connecting tube, 38 limiting ring, 40 cylindrical convex body, 41 through connecting hole, 42 threaded connecting hole. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Example: As attached Figure 1 To Attachment Fig. 9 As shown: The present invention provides a porous tantalum dental implant that optimizes the stability of the jawbone connection, comprising a crown portion 10, a base portion 11 and a root portion 12, wherein a threaded portion 13 is arranged on the outer wall of the root portion 12, and the root portion 12 has a three-dimensional gradient porous structure at a microscopic level, the root portion 12 and the base portion 11 are formed of pure tantalum material, the root portion 12 has an inner cavity opening upward, and a lower conical inner wall 14 is provided at the opening of the inner cavity, the crown portion 10 has a positioning groove 15, and the inner wall of the positioning groove 15 has an upper conical inner wall 16, and the base portion 11 comprises an upper positioning cone portion 17 and a lower positioning cone portion 18 connected in sequence, the upper positioning cone portion 17 cooperates with the upper conical inner wall 16, and the lower positioning cone portion 18 is provided at the bottom of the base portion 11, and the upper positioning cone portion 17 cooperates with the upper conical inner wall 16, and the lower positioning cone portion 18 is provided at the bottom of the base portion 11, and the upper positioning cone portion 17 cooperates with the upper conical inner wall 16, and the lower positioning cone portion 18 is provided at the bottom of the base portion 11, and the upper positioning cone portion 17 cooperates with the upper conical inner wall 16, and the upper positioning cone portion 17 cooperates with the upper conical inner wall 16, and the upper positioning cone portion 18 ... The positioning cone 18 cooperates with the lower conical inner wall 14, and the outer wall of the upper positioning cone 17 is provided with a plurality of circumferentially spaced first elastic cone plates 19, and a first hydraulic gap 20 is formed between the first elastic cone plate 19 and the outer wall surface of the upper positioning cone 17. The outer wall of the lower positioning cone 18 is provided with a plurality of circumferentially spaced second elastic cone plates 21, and a second hydraulic gap 22 is formed between the second elastic cone plate 21 and the outer wall of the lower positioning cone 18. A power chamber 23 for accommodating liquid and high-pressure gas is provided in the root portion 12, and a liquid flow channel is provided on the root portion 12, and the liquid flow channel sequentially connects the power chamber 23, the first hydraulic gap 20 and the second hydraulic gap 22.

[0036] When using the dental implant of this embodiment, a threaded hole must first be opened on the tooth bone at the corresponding position of the patient, and the root portion 12 must be implanted into the threaded hole. A temporary base must be installed on the root portion 12, and the patient must wait for a certain period of healing to allow the root portion 12 to become biologically compatible with the tooth bone. Then a permanent base is implanted. In this embodiment, the permanent base is the base portion 11 proposed in this embodiment. Finally, the crown portion 10 is installed on the base portion 11 to complete the implant surgery.

[0037] Since the root portion 12 of the present embodiment has a power chamber 23, when the user uses the present implant with a force exceeding a set value, the pressure acting on the crown portion 10 squeezes the base portion 11 downward. Since there are the first elastic cone plate 19 and the first hydraulic gap 20 on the base portion 11, the impact on the crown portion 10 is transmitted to the first elastic cone plate 19 on the base portion 11, and the first elastic cone plate 19 is deformed under pressure to squeeze the first hydraulic gap 20. The liquid in the first hydraulic gap 20 flows back to the power chamber 23 through the liquid flow channel, and the high-pressure gas in the power chamber 23 is squeezed, thereby achieving a buffering effect.

[0038] Similarly, when the impact on the base portion 11 is transmitted to the root portion 12, the impact is first transmitted to the second elastic cone plate 21. The second elastic cone plate 21 is compressed and deformed to squeeze the second hydraulic gap 22. The liquid in the second hydraulic gap 22 returns to the power chamber 23 through the liquid flow channel, and the gas therein is further squeezed, which has a further buffering effect.

[0039] Through the above-mentioned double shock-absorbing and buffering, the impact between the crown part 10 and the base part 11, the impact between the base part 11 and the root part 12, and the permanent deformation of the base part 11 and the root part 12 at the contact point can be reduced, thereby improving the stability of the connection between the crown part 10, the base part 11 and the root part.

[0040] In this embodiment, a conical surface is formed between the crown portion 10 and the base portion 11 through the upper positioning cone 17 and the upper conical inner wall 16, and a conical surface is also formed between the base portion 11 and the root portion 12 through the lower positioning cone 18 and the lower conical inner wall 14. Since the conical surface has a self-positioning effect, when the crown portion 10 is subjected to a severe impact, a short gap is formed between the crown portion 10, the base portion 11 and the root portion 12 to mitigate the impact, and under the action of the high-pressure gas in the power chamber 23, the three are pushed back to the initial position quickly and accurately. The implant has a good ability to maintain position accuracy.

[0041] In this embodiment, the tooth root 12 has a three-dimensional gradient porous structure at the microscopic level, simulating the microstructure of natural teeth, having an elastic modulus matching that of bone tissue and having good anti-fatigue mechanical properties, which can achieve good early bone integration and have stability under long-term cyclic loads.

[0042] like Figure 6 As shown, a grid tube 24 is disposed inside the tooth root portion 12 , and the inner wall of the grid tube 24 is recessed to form a strip groove 25 extending axially along the grid tube 24 , and a plurality of strip grooves 25 are distributed on the inner wall of the grid tube 24 at circumferential intervals.

[0043] like Figure 5 As shown, a pressure relief cylinder 26 is slidably arranged inside the grid cylinder 24, and the base portion 11 is connected inside the pressure relief cylinder 26. The bottom of the pressure relief cylinder 26 blocks the inner cavity of the root portion 12 to form a power cavity 23. The bottom of the pressure relief cylinder 26 is provided with an air passage groove 27 connected to the power cavity 23. The pressure relief cylinder 26 has a high-pressure air cavity 28 inside, and an elastic reset member 29 and a piston member 30 are slidably arranged in the high-pressure air cavity 28. The piston member 30 squeezes the elastic reset member 29 and approaches the power cavity 23 so that the air in the high-pressure air cavity 28 is squeezed into the power cavity 23. In this embodiment, the elastic reset member 29 is a compression spring. In other embodiments of the present invention, the elastic reset member 29 can also be an air spring.

[0044] In this embodiment, the pressure relief cylinder 26 can slide freely in the grid cylinder 24. After the crown portion 10 is impacted, when the impact force exceeds a limited value, the crown portion 10 pushes the base portion 11 downward to squeeze the pressure relief cylinder 26. The pressure relief cylinder 26 pushes the piston member 30 downward. The piston member 30 compresses the elastic reset member 29 and the volume of the power chamber 23. The gas pressure stored in the power chamber 23 increases, and the high-pressure gas acts on the liquid in the power chamber 23. The liquid flows out of the power chamber 23 under pressure and is replenished into the first hydraulic gap 20 and the second hydraulic gap 22 through the liquid flow channel to support the reset of the first elastic cone plate 19 and the second elastic cone plate 21.

[0045] The lateral impact force exerted on the crown portion 10 acts on the grid tube 24 through the base portion 11 and the pressure relief tube 26 in turn. Since the grid tube 24 itself has a plurality of strip grooves 25, it has a certain buffering performance and can absorb a part of the lateral impact force. When the lateral impact force is too large and exceeds the deformation limit of the grid tube 24, the grid tube 24 will be damaged before the root portion 12, thereby protecting the structure of the root portion 12 and the bone structure attached to the root portion 12, making it more convenient to replace and repair the implant.

[0046] like Figure 5 and Figure 6 As shown, the inner wall of the top opening of the pressure relief cylinder 26 has a lower conical inner wall 14, and the lower conical inner wall 14 is a smooth conical surface. The wall of the pressure relief cylinder 26 is provided with a hydraulic through hole 31, and the hydraulic through hole 31 is aligned with the gap between two adjacent second elastic cone plates 21. The liquid flowing out of the power chamber 23 flows through the strip groove 25, the hydraulic through hole 31 and enters the first hydraulic gap 20 to form a liquid flow channel.

[0047] like Figure 7 As shown, the base portion 11 also includes a connecting ring 32, the upper positioning cone 17 and the lower positioning cone 18 are respectively connected to the two sides of the connecting ring 32, a first guide gap is formed between two adjacent first elastic cone plates 19, and a second guide gap is formed between two adjacent second elastic cone plates 21. A through hole 33 is provided on the connecting ring 32, and two openings of the through hole 33 are respectively connected to the first guide gap and the second guide gap.

[0048] In this embodiment, the connecting ring 32 is used to connect the upper positioning cone 17 and the lower positioning cone 18 into one body. In specific implementation, a circular groove 34 and an annular groove 35 are respectively provided on both sides of the connecting ring 32. The inner walls of the annular groove 35 and the circular groove 34 are both threaded. The upper positioning cone 17 extends toward the circular groove 34 to form a threaded connecting column 36, and the lower positioning cone 18 extends toward the annular groove 35 to form a connecting tube 37. The connecting column 36 is threadedly connected to the circular groove 34, and the connecting tube 37 is threadedly connected to the annular groove 35.

[0049] like Figure 5As shown, the root portion 12 also includes a limiting ring 38, the lower wall surface of the limiting ring 38 abuts against the upper wall surface of the pressure relief cylinder 26 to limit the pressure relief cylinder 26 from leaving the inner cavity of the root portion 12, and a sealing rubber ring is arranged between the lower wall surface of the limiting ring 38 and the upper wall surface of the pressure relief cylinder 26.

[0050] like Figure 4 As shown, the base portion 11 extends toward the inner cavity of the root portion 12 to form a cylindrical convex body 40 , the outer circumference of the cylindrical convex body 40 is provided with an external thread, the inner wall of the pressure relief cylinder 26 has an internal thread matching the external thread, and the bottom of the cylindrical convex body 40 is against the piston member 30 .

[0051] In this embodiment, the base portion 11 is rotated. Since the base portion 11 and the pressure relief cylinder 26 are threadedly matched, as the base portion 11 rotates, the cylindrical protrusion 40 presses downward against the piston member 30, so that the piston member 30 compresses the air downward.

[0052] like Figure 3 As shown, the crown portion 10 is provided with a through-connection hole 41 which passes through the crown portion 10 from top to bottom. Figure 7 As shown, the base part 11 has a threaded connection hole 42 aligned with the connection hole 41 , and a screw is provided through the connection hole 41 to fix the crown part 10 to the base part 11 .

[0053] Preferably, the tooth root portion 12 is divided into two layers of gradient pores from the center to the periphery, the pore size of the layer close to the center is 150-300 μm, and the pore size of the layer far from the center is 550-650 μm.

[0054] A method for preparing a porous tantalum dental implant, comprising the above-mentioned porous tantalum dental implant, comprises the following steps: S1: Scan the patient's mandibular bone structure, and use modeling software to build a customized 3D model of tantalum dental implants based on the patient's bone structure scan model.

[0055] S2: Use an algorithm to configure a three-dimensional gradient porous structure for the tooth root 12 .

[0056] S3: Using laser melting additive manufacturing technology, porous tantalum dental implant models were additively manufactured using medical tantalum alloy powder as raw material.

[0057] S4: A Ta2O5 nanotube layer is formed on the surface of the tooth root 12 using micro-arc oxidation technology and alkali pretreatment technology.

[0058] Specific use of the present invention: First, the planting process: A threaded hole is opened on the tooth bone at the corresponding position of the patient, and the root part 12 is implanted into the threaded hole, and a temporary base is installed on the root part 12. The patient is waited for a certain period of healing to make the root part 12 and the tooth bone biologically compatible, and then a permanent base is implanted. In this embodiment, the permanent base is the base part 11 proposed in this embodiment. Finally, the crown part 10 is installed on the base part 11 to complete the implant surgery.

[0059] Second, double impact protection: Since the root portion 12 of the present embodiment has a power chamber 23, when the user uses the present implant with a force exceeding a set value, the pressure acting on the crown portion 10 squeezes the base portion 11 downward. Since there are the first elastic cone plate 19 and the first hydraulic gap 20 on the base portion 11, the impact on the crown portion 10 is transmitted to the first elastic cone plate 19 on the base portion 11, and the first elastic cone plate 19 is deformed under pressure to squeeze the first hydraulic gap 20. The liquid in the first hydraulic gap 20 flows back to the power chamber 23 through the liquid flow channel, and the high-pressure gas in the power chamber 23 is squeezed, thereby achieving a buffering effect.

[0060] When the impact on the base portion 11 is transmitted to the root portion 12, the impact is first transmitted to the second elastic cone plate 21. The second elastic cone plate 21 is compressed and deformed to squeeze the second hydraulic gap 22. The liquid in the second hydraulic gap 22 returns to the power chamber 23 through the liquid flow channel, and the gas therein is further squeezed, which has a further buffering effect.

[0061] Through the above-mentioned double shock-absorbing and buffering, the impact between the crown part 10 and the base part 11, the impact between the base part 11 and the root part 12, and the permanent deformation of the base part 11 and the root part 12 at the contact point can be reduced, thereby improving the stability of the connection between the crown part 10, the base part 11 and the root part 12.

[0062] Third, high-precision reset: The pressure relief cylinder 26 can slide freely in the grid cylinder 24. After the crown portion 10 is impacted, when the impact force exceeds the limit value, the crown portion 10 pushes the base portion 11 downward to squeeze the pressure relief cylinder 26. The pressure relief cylinder 26 pushes the piston member 30 downward. The piston member 30 compresses the elastic reset member 29 and the volume of the power chamber 23. The gas pressure stored in the power chamber 23 increases, and the high-pressure gas acts on the liquid in the power chamber 23. The liquid flows out of the power chamber 23 under pressure and is replenished into the first hydraulic gap 20 and the second hydraulic gap 22 through the liquid flow channel to support the reset of the first elastic cone plate 19 and the second elastic cone plate 21.

[0063] A conical surface is formed between the crown portion 10 and the base portion 11 through the upper positioning cone 17 and the upper conical inner wall 16, and a conical surface is also formed between the base portion 11 and the root portion 12 through the lower positioning cone 18 and the lower conical inner wall 14. Since the conical surface has a self-positioning effect, when the crown portion 10 is subjected to a severe impact, a short gap is formed between the crown portion 10, the base portion 11 and the root portion 12 to alleviate the impact, and under the action of the high-pressure gas in the power chamber 23, the three are pushed back to the initial position quickly and accurately. The implant has a good ability to maintain position accuracy.

[0064] Fourth, over-limit protection: The lateral impact force exerted on the crown portion 10 is respectively applied to the grid tube 24 through the base portion 11 and the pressure relief tube 26. Since the grid tube 24 itself has a plurality of strip grooves 25, it has a certain buffering performance and can absorb a part of the lateral impact force. When the lateral impact force is too large and exceeds the deformation limit of the grid tube 24, the grid tube 24 will be damaged before the root portion 12, thereby protecting the structure of the root portion 12 and the bone structure attached to the root portion 12, making it more convenient to replace and repair the implant.

[0065] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A porous tantalum dental implant for optimizing jawbone connection stability, characterized in that: The invention comprises a crown portion, a base portion and a root portion, wherein a threaded portion is arranged on the outer wall of the root portion, and the root portion has a three-dimensional gradient porous structure at a microscopic level. The root portion and the base portion are formed of pure tantalum material, and the root portion has an inner cavity opening upward, and the opening of the inner cavity has a lower conical inner wall, the crown portion has a positioning groove, and the inner wall of the positioning groove has an upper conical inner wall, and the base portion comprises an upper positioning cone portion and a lower positioning cone portion connected in sequence, the upper positioning cone portion cooperates with the upper conical inner wall, and the lower positioning cone portion cooperates with the lower conical inner wall, so that The outer wall of the upper positioning cone is provided with a plurality of circumferentially spaced first elastic cone plates, a first hydraulic gap is formed between the first elastic cone plate and the outer wall of the upper positioning cone, the outer wall of the lower positioning cone is provided with a plurality of circumferentially spaced second elastic cone plates, a second hydraulic gap is formed between the second elastic cone plate and the outer wall of the lower positioning cone, a power chamber for accommodating liquid and high-pressure gas is provided in the root portion, a liquid flow channel is provided on the root portion, and the liquid flow channel sequentially connects the power chamber, the first hydraulic gap and the second hydraulic gap.

2. A porous tantalum dental implant for optimizing jawbone connection stability according to claim 1, characterized in that: A grid tube is arranged inside the tooth root portion, the inner wall of the grid tube is recessed to form a strip groove extending axially along the grid tube, and a plurality of the strip grooves are circumferentially spaced and distributed on the inner wall of the grid tube.

3. A porous tantalum dental implant for optimizing jawbone connection stability according to claim 2, characterized in that: A pressure relief cylinder is slidably arranged inside the grid cylinder, the base portion is connected inside the pressure relief cylinder, the bottom of the pressure relief cylinder blocks the inner cavity of the tooth root portion to form the power cavity, an air passage groove connected to the power cavity is provided at the bottom of the pressure relief cylinder, a high-pressure air cavity is provided inside the pressure relief cylinder, an elastic reset member and a piston member are slidably arranged in the high-pressure air cavity, the piston member squeezes the elastic reset member and approaches the power cavity so that the air in the high-pressure air cavity is squeezed into the power cavity.

4. A porous tantalum dental implant for optimizing jawbone connection stability according to claim 3, characterized in that: The inner wall of the top opening of the pressure relief cylinder has the lower conical inner wall, and the lower conical inner wall is a smooth conical surface. The wall of the pressure relief cylinder is provided with a hydraulic through hole, and the hydraulic through hole is aligned with the gap between two adjacent second elastic cone plates. The liquid flowing out of the power chamber flows through the strip groove, the hydraulic through hole and enters the first hydraulic gap to form the liquid flow channel.

5. The porous tantalum dental implant for optimizing jawbone connection stability according to claim 3, characterized in that: The base portion also includes a connecting ring, the upper positioning cone portion and the lower positioning cone portion are respectively connected to both sides of the connecting ring, a first flow guide gap is formed between two adjacent first elastic cone plates, and a second flow guide gap is formed between two adjacent second elastic cone plates, and a through hole is provided on the connecting ring, and two openings of the through hole are respectively connected to the first flow guide gap and the second flow guide gap.

6. The porous tantalum dental implant for optimizing jawbone connection stability according to claim 3, characterized in that: The tooth root portion also includes a limiting ring, the lower wall surface of the limiting ring abuts against the upper wall surface of the pressure relief cylinder to limit the pressure relief cylinder from leaving the inner cavity of the tooth root portion, and a sealing rubber ring is arranged between the lower wall surface of the limiting ring and the upper wall surface of the pressure relief cylinder.

7. The porous tantalum dental implant for optimizing jawbone connection stability according to claim 3, characterized in that: The base portion extends toward the inner cavity of the tooth root portion to form a cylindrical convex body, the outer circumference of the cylindrical convex body is provided with an external thread, the inner wall of the pressure relief cylinder has an internal thread matching the external thread, and the bottom of the cylindrical convex body abuts against the piston member.

8. The porous tantalum dental implant for optimizing jawbone connection stability according to claim 1, characterized in that: The crown portion is provided with a through connection hole which passes through the crown portion up and down, the base portion has a threaded connection hole which is aligned with the connection hole, and a screw which fixes the crown portion to the base portion is arranged in the through connection hole.

9. The porous tantalum dental implant for optimizing jawbone connection stability according to claim 1, characterized in that: The tooth root is divided into two layers of gradient pores from the center to the periphery, the pore size of the layer close to the center is 150-300 μm, and the pore size of the layer far from the center is 550-650 μm.

10. A method for preparing a porous tantalum dental implant, comprising a porous tantalum dental implant for optimizing jawbone connection stability according to any one of claims 1 to 9, characterized in that ； The following steps are involved: S1: Scan the patient's mandibular bone structure, and use modeling software to build a customized 3D model of tantalum dental implants based on the patient's bone structure scan model; S2: Use the algorithm to configure the three-dimensional gradient porous structure of the tooth root; S3: Using laser melting additive manufacturing technology, a porous tantalum dental implant model was additively manufactured using medical tantalum alloy powder as raw material; S4: A Ta2O5 nanotube layer was formed on the root surface using micro-arc oxidation technology and alkali pretreatment technology.

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