Multi-point retention two-section tooth root type implant device

Abstract

The utility model discloses a multi-point retention two-section tooth root type implant device, and relates to the technical field of human oral medicine, the multi-point retention two-section tooth root type implant device comprises a tooth root type implant at a lower gingival section, a gingival penetrating necklace, a healing screw, a plurality of retention screws, a repair screw at an upper gingival section and a repair abutment, the gingival penetrating part of the tooth root type implant is provided with a repair retention keyway; an oblique retention screw bolt channel is arranged at the bottom, a retention groove is designed in the horizontal plane of the gum at the upper end, the root implant is placed in an original tooth extraction socket after an affected tooth is extracted, the retention screw is screwed into an alveolar bone through the retention screw bolt channel and can fix the root implant from different directions, and the gum penetrating collar is sleeved on the outer side of the gum penetrating part of the implant. The healing screw is installed in the repair retention bolt channel in the synostosis healing period to prevent foreign objects from entering the implant, and the repair screw is installed in the repair retention bolt channel after synostosis healing; according to the technical scheme provided by the invention, the initial stability of RAI can be improved, and the glazed all-ceramic gingival-penetrating necklace is adopted to solve the problems of gingival blackening and implant periphery inflammation.

Description

Technical Field

[0001] The utility model relates to the technical field of human oral medicine, in particular to a two-stage tooth root implant device with multi-point retention. Background Art

[0002] With the increasing perfection of pure titanium 3D printing technology in the field of stomatology, as well as the improvement of oral imaging technology and related AI computer software technology, root-type dental implants have developed in the field of oral implant medicine in recent years. Due to their minimal invasiveness, retention of the original tooth alveolar bone shape, preservation of the original tooth mucosa shape without losing aesthetic requirements, and comparable mechanics and corresponding functional structures of the original tooth, they are highly praised by doctors and patients in the field of oral implants who need the technology of extracting and implanting the affected teeth immediately.

[0003] However, current root-based implant technology places high demands on the morphological quality of the remaining alveolar bone of the original tooth. The integrity and depth of the socket walls of the tooth to be extracted must be maintained, and a percussion-pressure impaction method is used to ensure initial implant stability. Otherwise, implant failure is likely to occur. Furthermore, RAI (Root Analogue Implang) implants are based on a one-time extraction and placement technique, and subsequent RAI implantation cannot be repeated after a failure. In terms of patient selection, RAI implants are particularly suitable for teeth with shallow sockets or buccal and lingual socket bone defects due to periodontal disease or chronic apical inflammation. These shallow sockets or buccal and lingual bone defects make initial RAI implantation impossible. Existing one-stage RAI implants can cause occlusal impaction during chewing, which can disrupt initial RAI stability and lead to implant failure in some patients with occlusal loss. This is the primary reason why RAI implants are currently not widely used in dental practice. Utility Model Content

[0004] The purpose of the utility model is to provide a two-stage root implant device with multiple retention points, so as to solve the problems of initial instability after RAI implantation, blackening of gums and easy occurrence of peri-implantitis in the prior art.

[0005] The technical solution of the utility model is: to provide a two-stage root implant device with multiple points of retention, the two-stage root implant device with multiple points of retention comprises a root implant, a transgingival collar, a retention screw, a healing screw, a repair screw and a repair abutment;

[0006] The root implant comprises a transgingival part and an implant part, wherein the implant part is arranged in the alveolar socket, the transgingival part is arranged in the gum outside the alveolar socket, and the transgingival collar is arranged outside the transgingival part;

[0007] The healing screw is used to be installed on the root implant during the period of bone integration. The threaded end of the healing screw is fixed in the repair retention bolt channel, and the head end of the healing screw is located above the gingival part.

[0008] The repair screw is used to be installed on the root implant after bone union healing. A repair retention channel is set inside the gingival part. The threaded end of the repair screw is fixed in the repair retention channel. The head end of the repair screw is located above the gingival part. The repair abutment is sleeved on the outside of the head end of the repair screw. The retention screw passes through the root implant from the inside of the repair retention channel and is implanted into the alveolar bone.

[0009] Furthermore, at least one retaining screw channel is provided inside the root implant, the entrance of the retaining screw channel is provided at the bottom of the retaining screw channel or on the side wall of the repaired retaining screw channel, the outlet of the retaining screw channel is provided on the side wall of the implant part, the threaded end of the retaining screw is implanted into the alveolar bone through the retaining screw channel, and the head end of the retaining screw is provided in the retaining screw channel and fixedly connected to the retaining screw channel.

[0010] Furthermore, the transgingival collar is a circular cylinder parallel to the gum. The transgingival collar is arranged on the outside of the transgingival part and is located between the horizontal section of the alveolar bone and the horizontal section of the gum. The transgingival collar is made of zirconium oxide material and its surface is glazed.

[0011] Furthermore, the head end of the repair screw is a V-shaped structure, and its diameter at one end close to the gingival part is smaller than the diameter of its top end. The repair base is a circular ring structure tightly fitted on the head end of the repair screw. A repair screw retention bolt channel matching the shape of the head end of the repair screw is provided inside the repair base. The diameter of one end of the repair screw retention bolt channel close to the gingival part is larger than the diameter of the other end, and the inner wall of the repair screw retention bolt channel is a smooth surface.

[0012] Furthermore, the entrance of the repair retention bolt channel is located on the upper surface of the transgingival part, and the repair retention bolt channel extends from the upper surface of the transgingival part to a position inside the transgingival part close to the implant part.

[0013] Furthermore, at least one retention groove is provided on the outer wall of the upper end of the gingival portion, and a retention protrusion matching the retention groove is provided on the lower end of the repair abutment. The retention groove is used to engage with the retention protrusion to fix the repair abutment.

[0014] Furthermore, a row of semi-spherical cavities are provided on the outer wall of the implant part at a predetermined distance from the upper surface of the alveolar bone, and the cavities are used to increase the bone bonding area between the implant part and the alveolar bone.

[0015] Furthermore, the opening edge of the repair screw retention bolt channel close to one end of the gingival part is flush with the opening edge of the repair screw retention bolt channel at the upper end of the gingival part.

[0016] Furthermore, an inner thread matching the healing screw and the repair screw is provided on the side wall of the repair retention bolt channel, and an inner thread matching the retention screw is provided on the side wall of the retention screw bolt channel.

[0017] The beneficial effects of the utility model are:

[0018] The technical solution of the present invention is to set multiple retaining screws on the root implant, and use a multi-point retention method to solve the problem of low initial stability of RAI caused by shallow alveolar socket, buccal and lingual bone defects, and curved root compensation in the prior art. Multiple retaining screws can form cross-locking knots with the implanted alveolar part in different directions centered on RAI, thereby enhancing the initial stability of RAI. At the same time, a two-stage design is used to install the restoration base and crown after the RAI is stable, thereby solving the problem of chewing trauma after RAI implantation in patients with occlusal loss that destroys the initial stability of RAI, and preventing the restoration base part of the one-stage root implant from being exposed in the oral cavity, causing the loss of initial stability of the implant due to the effect of the occlusal force on the implant, and ultimately causing implant failure.

[0019] The technical solution of this utility model places a glazed all-ceramic transgingival collar around the RAI that is exposed outside the alveolar bone. This glazed all-ceramic transgingival collar solves the problem of gingival contamination and blackening caused by oxidized metal ion precipitation after RAI implantation. Furthermore, the smooth surface of the glazed all-ceramic transgingival collar is less susceptible to bacterial adhesion, effectively preventing inflammation around the implant. This technical solution can achieve the immediate removal and subsequent implantation of most teeth that require extraction after bone grafting in buccal and lingual bone defects, thus having a wide range of applications and a high clinical success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The advantages of the above and / or additional aspects of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 Schematic diagram of a two-stage root implant device with multiple retention points according to an embodiment of the present application being implanted into the alveolar bone;

[0022] Figure 2 is a side-section view of a root-type implant according to one embodiment of the present application;

[0023] Figure 3 is a schematic structural diagram of a transgingival collar according to an embodiment of the present application;

[0024] Figure 4 is a schematic structural diagram of a retaining screw according to an embodiment of the present application;

[0025] Figure 5is a schematic structural diagram of a healing screw according to an embodiment of the present application;

[0026] Figure 6 is a schematic structural diagram of a repair screw according to an embodiment of the present application;

[0027] Figure 7 is a structural schematic diagram of a repair abutment according to an embodiment of the present application;

[0028] Figure 8 It is a schematic structural diagram of a dental crown according to an embodiment of the present application.

[0029] Among them, 1-root implant, 11-transgingival part, 111-restoration retention channel, 112-retention groove, 12-implantation part, 121-retention screw channel, 2-transgingival collar, 3-retention screw, 4-healing screw, 5-restoration screw, 6-restoration abutment, 61-restoration screw retention channel, 62-retention protrusion, 7-crown. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0032] like Figures 1 to 8 As shown, this embodiment provides a two-stage root implant device with multiple points of retention. The two-stage root implant device with multiple points of retention is an RAI, which includes a first-stage implant in the subgingival section and a second-stage implant in the subgingival section, wherein the first-stage implant includes a root implant 1, a transgingival collar 2, a retention screw 3 and a healing screw 4, and the second-stage implant includes a repair screw 5, a repair abutment 6 and a crown 7.

[0033] The root implant 1 is a gum-level anatomical tooth root, designed for implantation within an alveolar socket. It comprises an upper, gingival-penetrating portion 11 and a lower, implanting portion 12. The two components form a single unit, with the gingival portion 11 positioned within the gums outside the socket, and the implanting portion 12 positioned within the socket after the tooth has been extracted. Once implanted, the interface between the gingival portion 11 and the implanting portion 12 is flush with the horizontal bone surface at the top of the alveolar bone.

[0034] A cylindrical repair retention bolt channel 111 with an inner thread is set at the center position inside the transgingival part 11, and the entrance of the repair retention bolt channel 111 is set on the upper surface of the transgingival part 11, and the repair retention bolt channel 111 extends from the upper surface of the transgingival part 11 to the position inside the transgingival part 11 close to the implant part 12 (that is, the position inside the transgingival part 11 close to the horizontal plane of the alveolar bone), and the repair retention bolt channel 111 is used to install the healing screw 4 during the bone union healing period, and to install the repair screw 5 after the bone union healing; at least one retention groove 112 is set on the outer wall of the upper end of the transgingival part 11, and the retention groove 112 is used to engage with the repair base 6 to fix the repair base 6 to prevent it from rotating during installation.

[0035] In this embodiment, when setting the repair retention bolt channel 111, it is possible to start from the central position of the upper surface of the gingival part 11 and drill the cylindrical repair retention bolt channel 111 with an inner wire downward as far as possible with the long axis of the root implant 1 as the center line. The lower end of the repair retention bolt channel reaches the bone level of the alveolar bone at the longest. The maximum downward drilling when setting the repair retention bolt channel 111 is to meet the retention and resistance conditions of the entire two-stage root implant, that is, to ensure that the two-stage root implant can be firmly fixed and will not loosen, and at the same time can resist the influence of forces such as occlusal force and lateral force, and will not be damaged or fall off due to force.

[0036] On the outer wall of the implant portion 12, a row of semi-spherical cavities (i.e., a row of semi-spherical cavities arranged continuously at a predetermined spacing) is provided at a predetermined distance from the upper surface of the alveolar bone (i.e., a predetermined distance from the upper edge of the alveolar socket, which is the hole extending downward from the upper surface of the alveolar bone to accommodate the tooth root). These semi-spherical cavities are used to increase the bone bonding area between the implant portion 12 and the alveolar bone, improve the stability of the root implant 1, and thereby enhance the secondary stability of the entire two-stage root implant. The predetermined distance can be set to 1 mm, and the diameter of the semi-spherical cavities can be set to 1 mm. Due to their semi-spherical shape, the socket depth is 0.5 mm. In this embodiment, the shape of the implant portion 12 is consistent with the shape of an actual tooth root, as shown in the figure.

[0037] At least one fixing screw channel 121 with an internal thread is arranged inside the root implant 1. The entrance of the fixing screw channel 121 is arranged at the bottom of the repair fixing channel 111 or on the side wall of the repair fixing channel 111. The outlet of the fixing screw channel 121 is arranged on the side wall of the implant part 12. The fixing screw channel 121 obliquely passes through the root implant 1 from the entrance inside the repair fixing channel 111 to the outlet on the side wall of the implant part 12. The fixing screw channel 121 is used to install the fixing screw 3.

[0038] The threaded end (i.e., the tip) of the retaining screw 3 is conical, and the conical threaded end has self-tapping properties on the alveolar bone, so that the retaining screw 3 can rotate and cut the alveolar bone during implantation and be successfully implanted into the alveolar bone; the head end of the retaining screw 3 is provided with a groove for tightening the screw, and the thread on the outer wall of the screw of the retaining screw 3 matches the inner thread of the retaining screw bolt channel 121, and the number of the retaining screws 3 is the same as the number of the retaining screw bolt channels 121.

[0039] The threaded end of the fixing screw 3 is implanted into the alveolar bone through the fixing screw bolt channel 121, and the head end of the fixing screw 3 is arranged in the fixing screw bolt channel 121 and is fixedly connected to the fixing screw bolt channel 121; specifically, the fixing screw 3 enters the fixing screw bolt channel 121 from the entrance end of the bottom surface of the repair fixing bolt channel 111, passes through the root implant 1 along the fixing screw bolt channel 121, and is implanted into the alveolar bone from the exit end of the side wall of the implant part 12; the fixing screw 3 can form at least one cross-locking knot with the implant part 12 in the alveolar bone, thereby enhancing the stability of the root implant 1, thereby ensuring the initial stability of the entire two-stage root implant.

[0040] In this embodiment, the entrance of the repair retention bolt channel 111 can be flexibly set inside the repair retention bolt channel 111. For example, when it is inconvenient to screw the retention screw 3 in the retention screw channel 121 from the bottom of the repair retention bolt channel 111 to the side wall of the implant part 12 (that is, the retention screw channel 121 with the entrance end set at the bottom of the retention bolt channel 111 is affected by external factors during operation and cannot be screwed in), the entrance end of the repair retention bolt channel 111 can be set on the side wall of the repair retention bolt channel 111, and the retention screw channel 121 can be opened from the side wall of the repair retention bolt channel 111 to the side wall of the implant part 12.

[0041] The transgingival collar 2 is a circular cylinder parallel to the gum, which is sleeved on the outside of the transgingival part 11 and located between the horizontal cross-section of the alveolar bone and the horizontal cross-section of the gum (drawing). The lower end of the transgingival collar 2 contacts the upper surface of the alveolar bone, and the upper end of the transgingival collar 2 is flush with the horizontal cross-section of the gum; the transgingival collar 2 is made of zirconium oxide material, and its surface is glazed. After the root implant 1 is implanted into the alveolar bone, the transgingival collar 2 is bonded to the outside of the transgingival part 11, and a certain interval is reserved between the outer side wall of the transgingival collar 2 and the edge of the horizontal cross-section of the alveolar bone, and the interval can be set to 0.5mm.

[0042] The healing screw 4 is used to be fixed on the root implant 1 through the repair retention bolt channel 111 during the bone integration healing period to prevent food residues in the oral cavity from entering the repair retention bolt channel 111, thereby protecting the implant, promoting soft tissue healing and maintaining space, so as to prepare for the subsequent installation of the repair screw 5, repair base 6 and crown 7; the threaded end of the healing screw 4 is fixed in the repair retention bolt channel 111, and the head end is located above the gingival part 11, and the threaded end of the healing screw 4 matches the repair retention bolt channel 111, wherein the size of the threaded end of the healing screw 4 matches the repair retention bolt channel 111, and the thread on the outer wall of the threaded end matches the inner thread of the repair retention bolt channel 111, and the head end of the healing screw 4 is provided with a groove for screwing and tightening itself.

[0043] The repair screw 5 is used to be fixed on the root implant 1 through the repair retention bolt channel 111 after bone union healing to support the repair base 6 and the crown 7; the threaded end of the repair screw 5 is fixed in the repair retention bolt channel 111, and the head end is located above the gingival part 11. The threaded end of the repair screw 5 matches the repair retention bolt channel 111, wherein the size of the threaded end of the repair screw 5 matches the repair retention bolt channel 111, and the thread on the outer wall of the threaded end matches the inner thread of the repair retention bolt channel 111. The head end of the repair screw 5 is a V-shaped structure, and its diameter close to the gingival part 11 is smaller than the diameter of its top end.

[0044] The repair base 6 is a circular ring structure tightly fitted on the head end of the repair screw 5, and a repair screw retention bolt channel 61 is set in the central position inside the repair base 6. The shape of the repair screw retention bolt channel 61 matches the shape of the head end of the repair screw 5. The repair screw retention bolt channel 61 is a V-shaped bolt channel, and its diameter near the end of the transgingival part 11 is larger than the diameter of its top end. The inner wall of the repair screw retention bolt channel 61 is a smooth surface and no internal thread is set; wherein, the opening edge of the repair screw retention bolt channel 61 near the end of the transgingival part 11 is flush with the opening edge of the repair retention bolt channel 111 at the upper end of the transgingival part 11 (that is, the two opening edges are connected to each other and maintained on the same horizontal plane).

[0045] In this embodiment, the cohesion angle of the restoration abutment 6 (the inclination angle of the V-shaped bolt channel) is set to 3° to 5°, that is, the inclination angle of the side wall of the restoration screw retention bolt channel 61 relative to the vertical downward line is 3° to 5°.

[0046] A retaining protrusion 62 is provided at the lower end of the restoration base 6, which matches the retaining groove 112 at the upper end of the transgingival part 11. The retaining protrusion 62 is used to be clamped with the retaining groove 112 to fix the restoration base 6. The shape of the retaining protrusion 62 matches the retaining groove 112, and the number of the retaining protrusion 62 and the retaining groove 112 are the same; the restoration base 3 is fixedly connected to the transgingival part 11 through the restoration screw 5. During installation, the restoration base 6 is first fixed to the root implant 1 through the matching relationship between the retaining protrusion 62 and the retaining groove 112, and then the restoration screw 5 is screwed into the root implant 1 through the restoration screw retention bolt 61, so that the restoration screw 5 and the restoration base 6 form a whole.

[0047] The dental crown 7 is mounted on the outside of the integral body formed by the restoration screw 5 and the restoration abutment 6 .

[0048] In this embodiment, a two-stage root implant device with multiple retention points is implanted in the alveolar bone at the location of the affected tooth, specifically including the following process:

[0049] First, the CBCT data was imported into Mimics Medical 21.0 software through CBCT imaging. The root morphology of the affected tooth was accurately extracted using Mimics Medical 21.0 software, and a model of the root implant 1 consistent with the root morphology of the affected tooth was established. The model of the root implant 1 was imported into Geomagic Wrap 2021 software, and the surface of the model was curved using Geomagic Wrap 2021 software to adapt the implant part 12 (i.e., the implanted root) to the alveolar socket, ensuring that the final object could be tightly integrated with the alveolar socket after implantation. The model after surface curvature processing was imported into Design X 2022.0 software, and the root implant 1 model was designed using Design X 2022.0 software.

[0050] Specifically, the gingival height of the affected tooth is obtained based on the gingival distribution data around the affected tooth. The gingival height is the distance from the horizontal plane of the upper end of the alveolar bone to the horizontal plane of the upper end of the gingiva at the affected tooth. The gingival height is used as the height of the transgingival part 11. According to the overall shape and density of the alveolar bone at the affected tooth, the alveolar bone thickness threshold and the alveolar bone density threshold are set. An area with a thickness reaching the alveolar bone thickness threshold and a density reaching the alveolar bone density threshold is selected around the alveolar socket of the affected tooth as the target area for setting the fixation point. Here, due to the diversity of the alveolar bone, the distribution of the target area is uneven. This requires selecting at least one point as a fixation point in the target area with the alveolar socket as the center, and ensuring that different fixation points are in different directions. After the fixation point is selected, the long axis of the root implant 1 model is used as the center line, starting from the central position of the upper surface of the transgingival part 11 and ending at the position inside the transgingival part 11 close to the implant part 12, a repair retention bolt channel 111 with an internal wire is set. Based on the location of the retention point, a retention screw channel 121 with an internal thread is provided from the inner wall of the restoration retention channel 111 to the position corresponding to the retention point on the side wall of the implant portion 12. The number of retention screw channels 121 is the same as the number of retention points. On the side wall of the implant portion 12, at a predetermined distance from the horizontal plane of the upper end of the alveolar bone, a series of semi-spherical cavities with a radius of 0.5 mm are provided. At least one point is selected on the outer wall of the upper end of the transgingival portion 11 to provide a retention groove 112 for fixing the restoration abutment 6. The final model of the root implant 1 is obtained. The final model data of the root implant 1 is saved in STL mode and printed out using a FastLayer printer. The remaining components of the root implant device are manufactured by a machining center (referring to an operation center containing high-end manufacturing equipment used to manufacture two-stage root implant devices) according to the dimensions of the root implant 1.

[0051] The doctor then implants the multi-point retention two-stage root implant device. The implantation process is as follows:

[0052] After the tooth to be implanted is extracted, the root implant 1 is placed in the alveolar socket of the original tooth after extraction, and the fixing screw 3 is screwed into the alveolar bone from the entrance of the fixing screw bolt channel inside the repair fixing bolt channel 111 to fix the root implant; the transgingival collar 2 is placed on the outer side of the transgingival part 11 of the upper part of the root implant 1; during the bone union formation period, the healing screw 4 is screwed into the repair fixing bolt channel 111 to prevent foreign objects from entering the root implant 1; after the root implant 1 and the alveolar bone are stably integrated (and the bone union is complete), the root implant 1 is fixed to the alveolar bone. (After the joint is formed), unscrew the healing screw 4; insert the retention protrusion 62 of the repair base 6 into the retention groove 112 on the upper occlusal surface of the root implant 1 to complete the docking of the repair base 6 and the root implant 1; pass the repair screw 5 through the V-shaped repair screw retention bolt channel 61 in the center of the repair base 6 and screw it into the repair retention bolt channel 111 in the root implant 1 to tightly link the repair base 6 and the root implant 1 together; bond the matching crown 7 on the repair base 6 to complete the entire RAI repair process.

[0053] In this embodiment, the software used to manufacture the components of the root implant device includes Mimics Medical 21.0 software, Geomagic Wrap 2021 software, and Design X 2022.0 software. Mimics Medical 21.0 software is used for medical image processing and three-dimensional modeling, and can extract anatomical structures from medical images such as CT. Geomagic Wrap 2021 software is used to process and edit 3D scan data and can convert this data into high-quality models. Design X 2022.0 software directly edits and optimizes data and is suitable for creating complex shapes and designs.

[0054] In this utility model, the terms "install," "connect," "connect," and "fix" should be understood in a broad sense. For example, "connect" can refer to a fixed connection, a detachable connection, or an integral connection; "connected" can refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0055] The shapes of the various components in the drawings are schematic, and certain differences from their actual shapes are not excluded. The drawings are only used to illustrate the principles of the present invention and are not intended to limit the present invention.

[0056] Although the present invention is disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and are not intended to limit the application of the present invention. The scope of protection of the present invention is defined by the appended claims and includes various modifications, variations, and equivalents made to the present invention without departing from the scope and spirit of the present invention.

Claims

1. A two-stage root implant device with multiple retention points, characterized in that: The multi-point retention two-stage tooth root implant device comprises a tooth root implant (1), a transgingival collar (2), a retention screw (3), a healing screw (4), a repair screw (5) and a repair base (6); The tooth root implant (1) comprises a gingival portion (11) and an implant portion (12), wherein the implant portion (12) is arranged in the alveolar socket, the gingival portion (11) is arranged in the gums outside the alveolar socket, and the gingival collar (2) is sleeved on the outside of the gingival portion (11); The healing screw (4) is used to be installed on the root implant (1) during the bone integration formation period, the threaded end of the healing screw (4) is fixed in the repair retention bolt channel (111), and the head end of the healing screw (4) is located above the gingival portion (11); The repair screw (5) is used to be installed on the root implant (1) after bone union healing, a repair retention bolt channel (111) is provided inside the gingival part (11), the threaded end of the repair screw (5) is fixed in the repair retention bolt channel (111), the head end of the repair screw (5) is located above the gingival part (11), the repair base (6) is sleeved on the outside of the head end of the repair screw (5), and the retention screw (3) is implanted into the alveolar bone from the inside of the repair retention bolt channel (111) through the root implant (1).

2. The multi-point-retained two-stage tooth root implant device according to claim 1, wherein: At least one retaining screw channel (121) is provided inside the root implant (1), the entrance of the retaining screw channel (121) is provided at the bottom of the retaining screw channel (111) or on the side wall of the repair retaining screw channel (111), the outlet of the retaining screw channel (121) is provided on the side wall of the implant part (12), the threaded end of the retaining screw (3) is implanted into the alveolar bone through the retaining screw channel (121), and the head end of the retaining screw (3) is provided in the retaining screw channel (121) and is fixedly connected to the retaining screw channel (121).

3. The multi-point-retained two-stage tooth root implant device according to claim 1, wherein: The transgingival collar (2) is a circular cylinder parallel to the gingival part. The transgingival collar (2) is sleeved on the outside of the transgingival part (11) and is located between the horizontal cross section of the alveolar bone and the horizontal cross section of the gingiva. The transgingival collar (2) is made of zirconium oxide material, and its surface is glazed.

4. The multi-point-retained two-stage tooth root implant device according to claim 1, wherein: The head end of the repair screw (5) is a V-shaped structure, and its diameter at one end close to the gingival part (11) is smaller than the diameter of its top end. The repair base (6) is a circular ring structure tightly fitted on the head end of the repair screw (5). A repair screw retaining bolt channel (61) matching the shape of the head end of the repair screw (5) is provided inside the repair base (6). The diameter of one end of the repair screw retaining bolt channel (61) close to the gingival part (11) is larger than the diameter of the other end. The inner wall of the repair screw retaining bolt channel (61) is a smooth surface.

5. The multi-point-retained two-stage tooth root implant device according to claim 1, characterized in that: The entrance of the repair retention bolt channel (111) is located on the upper surface of the transgingival part (11), and the repair retention bolt channel (111) extends from the upper surface of the transgingival part (11) to a position inside the transgingival part (11) close to the implant part (12).

6. The multi-point-retained two-stage tooth root implant device according to claim 1, wherein: At least one retaining groove (112) is provided on the outer wall of the upper end of the gingival portion (11), and a retaining protrusion (62) matching the retaining groove (112) is provided at the lower end of the repair base (6), and the retaining groove (112) is used to engage with the retaining protrusion (62) to fix the repair base (6).

7. The multi-point-retained two-stage tooth root implant device according to claim 1, wherein: On the outer wall of the implant part (12), a row of semi-spherical cavities are provided at a predetermined distance from the upper surface of the alveolar bone. The cavities are used to increase the bone bonding area between the implant part (12) and the alveolar bone.

8. The multi-point-retained two-stage tooth root implant device according to claim 4, characterized in that: The opening edge of the repair screw retention bolt channel (61) close to one end of the gingival portion (11) is flush with the opening edge of the repair retention bolt channel (111) at the upper end of the gingival portion (11).

9. The multi-point-retained two-stage tooth root implant device according to claim 2, wherein: An inner thread matching the healing screw (4) and the repair screw (5) is provided on the side wall of the repair retention bolt channel (111), and an inner thread matching the retention screw (3) is provided on the side wall of the retention screw bolt channel (121).

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