A two-stage root implant device with multi-point retention and its application

Abstract

The present invention discloses a two-stage root implant device with multi-point retention and application thereof, and relates to the technical field of human oral medicine, including a root implant, a transgingival collar, a retaining screw, a healing screw, a repair screw and a repair base, wherein a repair retention bolt channel and 1-3 retaining screw bolt channels are arranged in the root implant, inner threads are designed in the bolt channels, a retention groove is arranged on the occlusal surface of the upper end of the implant, a V-shaped bolt channel is arranged in the repair base, a small opening of the bolt channel corresponds to the repair retention bolt channel on the gingival surface of the implant, a retention protrusion matching the retention groove is arranged on the gingival surface of the repair base, the transgingival collar is 3D printed with zirconium oxide, and the tissue surface is glazed before use, thereby solving the problem that the gums of the metal transgingival part are oxidized to black and unsightly due to the precipitation of metal ions, and the smooth surface after glazing is not easy to retain bacteria, so as to effectively prevent peri-implantitis; the technical scheme of the present invention can improve the initial stability of RAI implantation and expand the clinical indications of RAI.

Description

Technical Field

[0001] The present invention relates to the technical field of human stomatology, and in particular to a two-stage tooth root implant device with multi-point retention and application thereof. Background Art

[0002] With the increasing perfection of metal pure titanium 3D printing technology in the field of oral medicine, as well as the improvement of oral imaging technology and related AI computer software technology, root-type dental implants have been developed in the field of oral implant medicine in recent years. Due to its minimally invasive nature, retention of the original tooth alveolar bone shape, preservation of the original tooth mucosal shape without losing aesthetic requirements, and comparable mechanics and corresponding functional structures to the original teeth, it is highly praised by physicians and patients in the field of oral implants who need the technology of extracting and implanting sick teeth at the same time.

[0003] However, the current root implant technology has high requirements on the morphological quality of the remaining alveolar bone of the original tooth. It is necessary to ensure the integrity and depth of the four walls of the alveolar socket of the tooth to be extracted, and the tapping and pressure impaction retention method is used to ensure the initial stability of the implanted root. Otherwise, it is easy to cause implant failure. At the same time, RAI (Root Analogue Implang) implantation is based on the extraction and implantation technology, and RAI implantation cannot be performed again after failure. In terms of case selection, especially some teeth with shallow alveolar sockets or buccal and lingual alveolar socket bone wall defects caused by periodontal disease or chronic apical inflammation, are the cases that need RAI implantation the most. Due to their shallow alveolar sockets or buccal and lingual bone defects, the initial stability of RAI cannot be guaranteed at all. For some patients with occlusal loss, the existing one-stage RAI will destroy the initial stability of RAI due to occlusal impact during chewing after implantation, resulting in implant failure. This is also the main reason why RAI cannot be popularized in oral clinics at present. Summary of the invention

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

[0005] The technical solution of the present invention is: to provide a two-stage root-type implant device with multiple points of retention, the two-stage root-type implant device with multiple points of retention is a RAI, which includes a root-type 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 gums outside the alveolar socket, a repair retention bolt channel is arranged inside the transgingival part, a repair base is fixedly connected with the transgingival part by a repair screw, and a transgingival collar is arranged outside the transgingival part;

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

[0008] The repair screw is used to be installed on the root implant after bone integration is formed, the threaded end of the repair screw is fixed in the repair retention bolt channel, the head end of the repair screw is located above the gingival part, and the repair abutment is sleeved on the outside of the head end of the repair screw;

[0009] At least one fixing screw bolt channel is arranged inside the tooth root type implant, the entrance of the fixing screw bolt channel is arranged at the bottom of the fixing screw bolt channel or on the side wall of the repair fixing screw bolt channel, and the exit of the fixing screw bolt channel is arranged on the side wall of the implant part;

[0010] One end of the fixing screw is implanted into the alveolar bone through the fixing screw bolt channel, and the other end is arranged in the fixing screw bolt channel and fixedly connected with the fixing screw bolt channel.

[0011] Furthermore, the transgingival collar is a circular cylinder parallel to the gingival, and 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.

[0012] 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 mounted on the outside of the head end of the repair screw. A V-shaped repair screw retention bolt channel matching the shape of the head end of the repair screw is arranged inside the repair base. The diameter of one end of the repair screw retention bolt channel close to the gingival part is smaller than the diameter of the other end. The inner wall of the repair screw retention bolt channel is a smooth surface, wherein the opening with a small diameter of the repair screw retention bolt channel corresponds to the position of the repair retention bolt channel.

[0013] Furthermore, the entrance of the repair retention bolt channel is located on the upper surface of the gingival part, and the repair retention bolt channel extends from the upper surface of the gingival part to a position inside the gingival part close to the implant part;

[0014] At least one retention groove is arranged on the occlusal surface at the upper end of the transgingival part, and a retention protrusion matching the retention groove is arranged at the lower end of the repair base. The retention groove is used to engage with the retention protrusion to fix the repair base.

[0015] Furthermore, an inner thread matching the healing screw and the repair screw is arranged on the side wall of the repair retention bolt channel, and an inner thread matching the retention screw is arranged on the side wall of the retention screw bolt channel;

[0016] The multi-point retention two-stage root implant device also includes a crown, which is installed outside the restoration base.

[0017] The technical solution of the present invention also provides an application of a two-stage root implant device with multi-point retention, comprising:

[0018] Step 1, obtaining three-dimensional structural data of the position of the affected tooth, extracting the root morphology of the affected tooth based on the three-dimensional structural data, and establishing a root implant model consistent with the root morphology of the affected tooth; wherein the three-dimensional structural data includes the shape and density of the alveolar bone;

[0019] Step 2, according to the shape and density of the alveolar bone, select at least one point in one direction around the alveolar socket as a fixing point, set a repair fixing bolt channel in the root implant model, set a fixing screw bolt channel in the root implant model according to the position of the fixing point, wherein the entrance of the fixing screw bolt channel is located inside the repair fixing bolt channel, and the exit of the fixing screw bolt channel corresponds to the fixing point, and the root implant model is 3D printed;

[0020] Step 3, obtaining the horizontal edge position of the upper end of the alveolar bone and the gingival height according to the three-dimensional structure data, obtaining the size of the transgingival collar based on the horizontal edge position of the upper end of the alveolar bone and the gingival height, making the transgingival collar according to the size and glazing its tissue surface;

[0021] Step 4, making a corresponding healing screw according to the size of the repair retention bolt channel, and making a corresponding retention screw according to the size of the retention screw bolt channel;

[0022] Step 5, establishing a model of a repair abutment based on the three-dimensional structure data and the size of the root-type implant, setting a repair screw retention bolt channel in the three-dimensional model of the repair abutment according to the size of the repair retention bolt channel and the preset cohesion angle, and 3D printing the repair abutment; wherein the preset cohesion angle is the inclination angle of the side wall of the repair screw retention bolt channel;

[0023] Step 6, manufacturing a repair screw according to the size of the repair screw retention bolt channel and the repair retention bolt channel, so that the head end of the repair screw matches the repair screw retention bolt channel and the thread end matches the repair retention bolt channel;

[0024] Step 7, implanting the completed multi-point retention two-stage root implant device.

[0025] Furthermore, step 2 specifically includes:

[0026] The tooth root type implant comprises a gingival part and an implantation part. According to the shape and density of the entire alveolar bone at the position of the affected tooth, an alveolar bone thickness threshold and an 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 a target area. At least one point is selected in the target area with the alveolar socket as the center as a fixing point. With the long axis of the three-dimensional model of the tooth root type implant as the center line, a repair retention bolt channel with an inner thread is set from the central position of the upper surface of the gingival part to the position inside the gingival part close to the implantation part. According to the position of the fixing point, a fixing screw bolt channel with an inner thread is set from the inner wall of the repair retention bolt channel to the position corresponding to the fixing point on the side wall of the implantation part.

[0027] A row of semi-spherical cavities of a predetermined size are arranged on the side wall of the implant part at a predetermined distance from the horizontal plane of the upper end of the alveolar bone, and a retention groove is arranged at at least one point on the outer wall of the upper end of the gingival part.

[0028] Furthermore, step 3 specifically includes:

[0029] Take the position at a predetermined distance from the edge of the horizontal plane of the upper end of the alveolar bone as the boundary, take the distance from the boundary to the outer wall of the transgingival part as the thickness of the side wall of the transgingival collar, take the gingival height as the height of the transgingival collar, and obtain the overall size of the transgingival collar. Based on the size, the transgingival collar 2 is 3D printed using zirconium oxide.

[0030] Furthermore, the model of the repair base in step 5 specifically includes:

[0031] Taking the position at a predetermined distance from the edge of the upper horizontal plane of the gum as the boundary, and the distance from the boundary to the center of the restoration retention bolt channel as the radius of the restoration abutment, a model of the restoration abutment is established, and a retention protrusion matching the retention groove is set at the position corresponding to the retention groove at the lower end of the restoration abutment model.

[0032] Furthermore, in step 5, according to the size of the repair retention bolt channel and the preset cohesion angle, a repair screw retention bolt channel is set in the repair abutment three-dimensional model, which specifically includes:

[0033] A V-shaped and smooth repair screw retention bolt channel is set from the center of the repair base model, so that the opening at the lower end of the repair screw retention bolt channel corresponds to the position of the repair retention bolt channel and has the same diameter. The preset cohesion angle ranges from 3° to 5°.

[0034] The beneficial effects of the present invention are:

[0035] The technical solution of the present invention is to set multiple fixing screws on the root implant device, and use multi-point retention 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. The multiple fixing 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 impact after RAI implantation that destroys the initial stability of RAI in patients with occlusal loss.

[0036] The technical solution in the present invention sets a glazed all-ceramic transgingival collar around the RAI exposed outside the alveolar bone, which solves the problem that the gums are contaminated and blackened by the precipitation of oxidized metal ions after RAI implantation, and that bacteria easily attach to the transgingival site of RAI and cause peri-implantitis. The technical solution in the present invention can complete the immediate extraction and implantation of most teeth that need to be extracted after bone grafting of teeth with buccal and lingual bone defects. It has a wide range of applications and a high clinical success rate. The technical solution in the present invention expands the clinical indications of RAI and will be more widely used in painless, minimally invasive, safe, and personalized implantation of teeth that need to be extracted, improves the long-term retention rate of dental implants, and performs immediate extraction and implantation at the same time as tooth extraction, shortens the dental implant cycle, and makes it a reality to maintain the original aesthetics, mechanics, and anatomical structure of the original teeth. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The advantages of the above and / or additional aspects of the present invention will become apparent and easily understood in the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 is a schematic structural diagram of a two-stage tooth root implant device with multi-point retention according to an embodiment of the present invention;

[0039] Figure 2 is a side cut view of a root-type implant according to an embodiment of the present invention;

[0040] Figure 3 is a schematic structural diagram of a transgingival collar according to an embodiment of the present invention;

[0041] Figure 4 is a schematic structural diagram of a retaining screw according to an embodiment of the present invention;

[0042] Figure 5 is a schematic structural diagram of a healing screw according to an embodiment of the present invention;

[0043] Figure 6 is a schematic structural diagram of a repair screw according to an embodiment of the present invention;

[0044] Figure 7is a schematic structural diagram of a repair base according to an embodiment of the present invention;

[0045] Figure 8 Schematic diagram of the structure of a dental crown according to an embodiment of the present invention.

[0046] 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, 8-gum, 9-alveolar bone. DETAILED DESCRIPTION

[0047] 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 in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0048] 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 protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0049] The present embodiment provides a two-stage root-type implant device with multi-point retention and an application thereof, wherein the software used to manufacture the components in the root-type 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 scanning data, and can convert these data into high-quality models. DesignX 2022.0 software directly edits and optimizes data, and is suitable for the creation of complex shapes and designs.

[0050] like Figures 1 to 8 As shown, this embodiment provides a two-stage root implant device with multi-point retention, which includes a first implant section below the gum and a second implant section above the gum, wherein the first implant section includes a root implant 1, a transgingival collar 2, a retaining screw 3 and a healing screw 4, and the second implant section includes a repair screw 5, a repair base 6 and a crown 7.

[0051] The root implant 1 is a gum-level anatomical root, which is used to be implanted inside the alveolar socket. The root implant 1 includes a gingival-penetrating portion 11 at the upper end and an implanting portion 12 at the lower end. The gingival-penetrating portion 11 and the implanting portion 12 are a whole. The gingival-penetrating portion 11 is arranged in the gums outside the alveolar socket, and the implanting portion 12 is implanted in the alveolar socket at the affected tooth; wherein, after the root implant 1 is implanted into the alveolar socket, the interface between the gingival-penetrating portion 11 and the implanting portion 12 is flush with the bone horizontal surface of the top of the alveolar bone.

[0052] A cylindrical repair retention bolt channel 111 with an inner thread is arranged at the center position inside the transgingival part 11, the entrance of the repair retention bolt channel 111 is arranged 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 formation period, and to install the repair screw 5 after the bone union is formed; at least one retention groove 112 is arranged on the outer wall of the upper end of the transgingival part 11, and the retention groove 112 is used to clamp with the repair base 6 to fix the repair base 6 to prevent it from rotating during installation.

[0053] 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 downward to the maximum extent the cylindrical repair retention bolt channel 111 with an inner thread with the long axis of the root implant 1 as the center line. The lower end of the repair retention bolt channel can reach the bone horizontal plane of the alveolar bone at the longest. When setting the repair retention bolt channel 111, the maximum downward drilling is to meet the retention and resistance conditions of the entire two-stage root implant device, that is, to ensure that the two-stage root implant device can be firmly fixed and will not loosen, and at the same time can resist the influence of bite force, lateral force and other forces, and will not be damaged or fall off due to force.

[0054] A row of semi-spherical cavities (i.e. a row of semi-spherical cavities arranged continuously at a preset interval) is arranged on the outer wall of the implant part 12 at a position predetermined distance from the upper surface of the alveolar bone (i.e. a position predetermined distance from the upper edge of the alveolar socket, where the alveolar socket is a hole extending downward from the upper surface of the alveolar bone for accommodating the tooth root). The semi-spherical cavities are used to increase the bone bonding area between the implant part 12 and the alveolar bone, and to improve the stability of the root implant 1, thereby enhancing the secondary stability of the entire two-stage root implant device; wherein the predetermined distance can be set to 1mm, and the diameter of the semi-spherical cavity can be set to 1mm. Since it is semi-spherical, the socket depth is 0.5mm.

[0055] At least one retaining screw channel 121 with an internal thread is arranged inside the root-type implant 1, the entrance of the retaining screw channel 121 is arranged at the bottom of the repair retaining channel 111 or on the side wall of the repair retaining channel 111, and the outlet of the retaining screw channel 121 is arranged on the side wall of the implant part 12. The retaining screw channel 121 obliquely passes through the root-type implant 1 from the entrance inside the repair retaining channel 111 to the outlet on the side wall of the implant part 12, and the retaining screw channel 121 is used to install the retaining screw 3.

[0056] 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 in 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 rod 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 channel 121.

[0057] The threaded end of the retaining screw 3 is implanted into the alveolar bone through the retaining screw bolt channel 121, and the head end of the retaining screw 3 is arranged in the retaining screw bolt channel 121 and is fixedly connected to the retaining screw bolt channel 121; specifically, the retaining screw 3 enters the retaining screw bolt channel 121 from the entrance end of the bottom surface of the repair retaining bolt channel 111, passes through the root implant 1 along the retaining 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 retaining 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 device.

[0058] 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 the retention screw channel 121 from the bottom of the repair retention bolt channel 111 to the side wall of the implant part 12 is not convenient for screwing the retention screw 3 (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 retention screw 3), 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.

[0059] 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 plane of the upper end of the alveolar bone and the horizontal plane of the upper end of the gum. 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 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 in 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 section of the alveolar bone, and the interval can be set to 0.5mm.

[0060] 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 formation 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, the repair base 6 and the crown 7; the threaded end of the healing screw 4 is fixed in the repair retention bolt channel 111, 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, 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.

[0061] The repair screw 5 is used to be fixed on the root implant 1 through the repair retention bolt channel 111 after bone integration is formed, so as 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, and 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, and 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.

[0062] The repair base 6 is a circular ring structure tightly mounted on the head end of the repair screw 5, and a repair screw retention bolt channel 61 is arranged at 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 at one end close to 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 arranged; wherein, the opening with a small diameter of the repair screw retention bolt channel 61 corresponds to the position of the repair retention bolt channel 111 at the upper end of the transgingival part 11, and the opening edge with a small diameter of the repair screw retention bolt channel 61 is flush with the opening edge of the repair retention bolt channel 111 (that is, the two opening edges are butted against each other and maintained on the same horizontal plane).

[0063] In this embodiment, the cohesion angle (the inclination angle of the V-shaped bolt channel) of the repair base 6 is set to 3° to 5°, that is, the inclination angle of the side wall of the repair screw retention bolt channel 61 relative to the vertical downward line is 3° to 5°.

[0064] A retaining protrusion 62 matching the retaining groove 112 at the upper end of the transgingival part 11 is provided at the lower end of the restoration base 6. 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 by the restoration screw 5. During installation, the restoration base 6 is first fixed to the root implant 1 by 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 retaining bolt channel 61, so that the restoration screw 5 and the restoration base 6 form a whole.

[0065] The dental crown 7 is mounted on the outside of the integral body formed by the restoration screw 5 and the restoration abutment 6 .

[0066] In this embodiment, the shape of the tooth root type implant 1 is consistent with the shape of the root of the affected tooth. The tooth root type implant 1 can be manufactured in the following manner:

[0067] Take a CBCT diagnostic film of the affected tooth in the oral cavity, import the CBCT data into a USB flash drive, and then import it into MimicsMedical 21.0 software through the USB flash drive. Use Mimics Medical 21.0 software to accurately extract the root morphology of the affected tooth through 3D rendering technology; import the extracted root morphology file into Geomagic Wrap 2021 software for surface curvature processing, and import the surface curvature processed file into Design X 2022.0 software to design the model morphology of the matching root implant 1 that is consistent with the root morphology of the affected tooth, and make a 0.5mm hole and a central cavity design on the root surface; finally, save the designed file in STL mode and print the entity using the FastLayer printing device.

[0068] like Figure 1 As shown, this embodiment provides an application of a two-stage root implant device with multi-point retention, including:

[0069] Step 1, take a CBCT image of the oral cavity of the affected tooth, obtain the three-dimensional structural data of the position of the affected tooth through the CBCT image, extract the root morphology of the affected tooth based on the three-dimensional structural data, and establish a model of the root implant 1 consistent with the root morphology of the affected tooth, wherein the three-dimensional structural data includes the shape and density data of the alveolar bone and the distribution data of the gums around the affected tooth.

[0070] The three-dimensional structural data at the position of the affected tooth include the shape and density data of the alveolar bone, the structure of the alveolar socket of the affected tooth, the distribution of the gums around the affected tooth, the spatial proximity relationship data between the affected tooth and the adjacent teeth, the spatial proximity relationship data between the affected tooth and the opposing teeth, etc.; the CBCT data is imported into the Mimics Medical 21.0 software, and the Mimics Medical 21.0 software is used to accurately extract the root morphology of the affected tooth, and a model of the root implant 1 consistent with the root morphology of the affected tooth is established, and the model of the root implant 1 is imported into the Geomagic Wrap 2021 software, and the Geomagic Wrap 2021 software is used to perform surface curvature processing on the model to make the implant part 12 (i.e., the implanted root) fit the alveolar socket, ensuring that the final physical object can be tightly integrated with the alveolar socket after implantation.

[0071] Step 2, according to the shape and density data of the alveolar bone, determine the target area for setting the fixing point around the alveolar socket, select at least one point in a direction in the target area as the fixing point, set a repair fixing channel 111 in the root implant 1 model, and set a fixing screw channel 121 in the root implant 1 model according to the position of the fixing point, wherein the entrance of the fixing screw channel 121 is located inside the repair fixing channel 111, and the outlet of the fixing screw channel 121 corresponds to the fixing point (and the outlet of the fixing screw channel 121 is located at the fixing point), and then the root implant 1 model is 3D printed.

[0072] The model after surface curvature processing is imported into Design X 2022.0 software, and the root implant model 1 is designed using Design X 2022.0 software; specifically, the gingival height of the affected tooth position is obtained according to the gingival distribution data around the affected tooth, and the gingival height is the distance from the upper horizontal plane of the alveolar bone to the upper horizontal plane of the gingiva at the affected tooth position, and the gingival height is used as the height of the gingival-penetrating part 11. According to the overall shape and density of the alveolar bone at the position of the affected tooth, the alveolar bone thickness threshold and the alveolar bone density threshold are set, and 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 fixing point. Here, due to the diversity of the alveolar bone, the distribution of the target area is uneven, which requires selecting at least one point as the fixing point in the target area with the alveolar socket as the center, and ensuring that the directions of different fixing points are different. After the fixing 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 to the position inside the transgingival part 11 close to the implant part 12, a repair retention bolt channel 111 with an inner wire is set, and the root According to the position of the fixing point, a fixing screw channel 121 with an inner thread is set from the inner wall of the repair fixing channel 111 to the position corresponding to the fixing point on the side wall of the implant part 12. The number of the fixing screw channels 121 is the same as the number of the fixing points. On the side wall of the implant part 12, a row of semi-spherical cavities are set at a predetermined distance from the horizontal plane of the upper end of the alveolar bone. The radius of the semi-spherical cavity is 0.5 mm. At least one point is selected on the outer wall of the upper end of the gingival part 11 to set a fixing groove 112 for fixing the repair base 6, so as to obtain the final model of the root implant 1, and the final model data of the root implant 1 is saved in STL mode, and the entity of the root implant 1 is printed out using a FastLayer printing device.

[0073] Step 3, obtain the horizontal edge position of the upper end of the alveolar bone and the gingival height according to the gingival distribution data around the affected tooth, obtain the size of the transgingival collar 2 based on the horizontal edge position of the upper end of the alveolar bone and the gingival height, make the transgingival collar 2 according to the size and glaze its tissue surface.

[0074] According to the gingival distribution data around the affected tooth, the information on the position of the edge of the horizontal plane of the upper end of the alveolar bone is obtained, and the position at a predetermined distance from the edge of the horizontal plane of the upper end of the alveolar bone is used as the boundary. The distance from the boundary to the outer wall of the gingival part 11 is used as the thickness of the side wall of the gingival collar 2, and the gingival height is used as the height of the gingival collar 2. The data of the outer wall diameter, inner wall diameter and height of the gingival collar 2 are obtained, that is, the overall size, wherein the height of the gingival collar 2 is the same as the height of the gingival part 11, and the predetermined distance is 0.5 mm. Based on this size, the gingival collar 2 is 3D printed using zirconium oxide.

[0075] Step 4, according to the size of the fixing screw bolt channel 121, make the corresponding fixing screw 3, and according to the size of the repairing fixing bolt channel 111, make the corresponding healing screw 4.

[0076] The diameter of the fixing screw 3 is determined according to the diameter of the fixing screw bolt channel 121, so that the fixing screw 3 matches the fixing screw bolt channel 121; the size of the healing screw 4 is determined according to the size of the repair fixing bolt channel 111, so that the size of the threaded end of the healing screw 4 matches the size of the repair fixing bolt channel 111, and the width of the head end of the healing screw 4 is greater than the diameter of the repair fixing bolt channel 111, so that after the healing screw 4 is installed, food residues in the mouth can be prevented from entering the repair fixing bolt channel 111. In this embodiment, after obtaining the sizes of the fixing screw bolt channel 121 and the repair fixing bolt channel 111, the corresponding fixing screws 3 and healing screws 4 can be manufactured in a machining center (referring to an operation center containing high-end manufacturing equipment for manufacturing a two-stage root implant device).

[0077] Step 5, based on the three-dimensional structure data and the size of the root implant 1, establish a model of the repair base 6, set the repair screw retention bolt channel 61 in the three-dimensional model of the repair base 6 according to the size of the repair retention bolt channel 111 and the preset cohesion angle, and 3D print the repair base (6); wherein the preset cohesion angle is the inclination angle of the side wall of the repair screw retention bolt channel 61 (that is, the inclination angle of the side wall generatrix relative to the vertical line).

[0078] According to the gingival distribution data around the affected tooth, the position data of the horizontal edge of the upper end of the gum is obtained, and the position at a predetermined distance from the position of the horizontal edge of the upper end of the gum is used as the boundary. The distance from the boundary to the center of the repair retention bolt channel 111 is used as the radius of the repair base 6, and a model of the repair base 6 is established. A retention protrusion 62 matching the retention groove 112 is set at the position corresponding to the retention groove 112 at the lower end of the repair base 6 model, and a V-shaped and smooth repair screw retention bolt channel 61 is set at the central position of the repair base 6 model, so that the opening at the lower end of the repair screw retention bolt channel 61 corresponds to the position of the repair retention bolt channel 111 and has the same diameter, and the inclination angle of the V-shaped repair screw retention bolt channel 61 is equal to the preset cohesion angle, and the preset cohesion angle ranges from 3° to 5°. The final model of the repair base 6 is 3D printed.

[0079] In this embodiment, the height of the restoration base 6 is a predetermined height, which needs to be specifically determined based on data such as the distance between the jaws and the distribution of the bite force at the affected tooth in actual cases. The specific determination process is an existing method. The crown 7 needs to be specifically manufactured based on the three-dimensional structure data of the affected tooth in actual cases, the impression data, etc. The manufacturing process is an existing method and will not be repeated here.

[0080] Step 6, making a repair screw (5) according to the size of the repair retention bolt channel 111 and the repair screw retention bolt channel 61, so that the head end of the repair screw (5) matches the repair screw retention bolt channel 61 and the thread end matches the repair retention bolt channel 111.

[0081] The size of the repair screw 5 is determined according to the size of the repair retention bolt channel 111 and the repair screw retention bolt channel 61, so that the size of the threaded end of the repair screw 5 matches the size of the repair retention bolt channel 111, and the size of the threaded end of the repair screw 5 matches the size of the V-shaped repair screw retention bolt channel 61.

[0082] Step 7, the above-mentioned completed parts form a multi-point retention two-stage tooth root type implant device, and the completed multi-point retention two-stage tooth root type implant device is implanted.

[0083] In this embodiment, after the multi-point retention two-stage tooth root type implant device is manufactured, the physician implants the multi-point retention two-stage tooth root type implant device, and the implantation process is as follows:

[0084] 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 sleeved on the outer side of the transgingival part 11 of the upper part of the root implant 1; during the period of bone integration, 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 forms a stable bone integration with the alveolar bone (and the bone is After the combination is formed), unscrew the healing screw 4; insert the retention protrusion 62 of the repair base 6 into the retention groove 112 of 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.

[0085] In this embodiment, the transgingival collar 2 is 3D printed with zirconium oxide and glazed on the tissue surface before use, which solves the problem of the gums in the metal transgingival part becoming unsightly black due to oxidation caused by the precipitation of metal ions. At the same time, the smooth surface after glazing is not easy to retain bacteria, which can effectively prevent peri-implantitis.

[0086] In the present invention, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connect" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] The shapes of 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.

[0088] 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 may include various modifications, alterations and equivalents made to the 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 transgingival portion (11) and an implantation portion (12), wherein the implantation portion (12) is arranged in an alveolar socket, the transgingival portion (11) is arranged in the gums outside the alveolar socket, a repair retention bolt channel (111) is arranged inside the transgingival portion (11), the repair base (6) is fixedly connected to the transgingival portion (11) via the repair screw (5), and the transgingival collar (2) is sleeved on the outside of the transgingival portion (11); The healing screw (4) is used to be installed on the tooth 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), the head end of the healing screw (4) is located above the gingival part (11), and the threaded end of the healing screw (4) matches the repair retention bolt channel (111); The repair screw (5) is used to be installed on the tooth root implant (1) after bone integration is formed, 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 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, and a V-shaped repair screw retention bolt channel (61) matching the shape of the head end of the repair screw (5) is arranged inside the repair base (6), and the repair base (6) is tightly sleeved on the outside of the head end of the repair screw (5) through the repair screw retention bolt channel (61); At least one retaining screw bolt channel (121) is arranged inside the tooth root type implant (1), the entrance of the retaining screw bolt channel (121) is arranged at the bottom of the retaining bolt channel (111) or on the side wall of the repair retaining bolt channel (111), and the outlet of the retaining screw bolt channel (121) is arranged on the side wall of the implant part (12); One end of the fixing screw (3) is implanted in the alveolar bone through the fixing screw bolt channel (121), and the other end is arranged in the fixing screw bolt channel (121) and fixedly connected to the fixing screw bolt channel (121).

2. The multi-point-retained two-stage root implant device according to claim 1, characterized in that: The transgingival collar (2) is a circular cylinder parallel to the gingival. 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.

3. The multi-point-retained two-stage tooth root implant device according to claim 1, characterized in that: The repair base (6) is a circular ring structure tightly mounted on the outside of the head end of the repair screw (5), the diameter of one end of the repair screw retention bolt channel (61) close to the gingival part (11) is smaller than the diameter of the other end, and the inner wall of the repair screw retention bolt channel (61) is a smooth surface, wherein the opening with a small diameter of the repair screw retention bolt channel (61) corresponds to the position of the repair retention bolt channel (111).

4. 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 portion (11), and the repair retention bolt channel (111) extends from the upper surface of the transgingival portion (11) to a position inside the transgingival portion (11) close to the implant portion (12); At least one retaining groove (112) is arranged on the occlusal surface at the upper end of the transgingival portion (11), and a retaining protrusion (62) matching the retaining groove (112) is arranged 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).

5. The two-stage root implant device with multiple retention points as claimed in claim 1, characterized in that: An inner thread matching the healing screw (4) and the repair screw (5) is arranged on the side wall of the repair retention bolt channel (111), and an inner thread matching the retention screw (3) is arranged on the side wall of the retention screw bolt channel (121); The multi-point retention two-stage tooth root implant device also includes a tooth crown (7), and the tooth crown (7) is installed outside the restoration base (6).

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