Multi-point fixation two-piece root analogue implant apparatus and use thereof

Abstract

Disclosed are a multi-point fixation two-piece root analogue implant apparatus and use thereof, which relate to the technical field of human stomatology. The apparatus comprises a root analogue implant, a transgingival collar, a fixation screw, a healing screw, a restoration screw, and a restoration abutment, wherein the root analogue implant is internally provided with a restoration fixation channel and 1-3 fixation screw channels, and all the channels are internally threaded. The occlusal surface of the upper end of the implant is provided with a fixation recess. The restoration abutment is internally provided with a V-shaped channel, and the smaller opening of the channel corresponds to the restoration fixation channel on the gingival surface of the implant. The gingival surface of the restoration abutment is provided with a fixation protrusion matched with the fixation recess. The transgingival collar is 3D printed by using zirconia and is used after the tissue surface is glazed. This solves the problem of unsightly blackening of the gums due to metal ion precipitation and oxidation at the metal transgingival portion. Furthermore, the smooth glazed surface resists bacterial adhesion, effectively preventing peri-implantitis. The technical solutions of the present invention can improve the initial stability of RAI implantation and expand the clinical indications for RAI.

Description

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

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 202411567596.3, filed on November 5, 2024, entitled "A two-stage root canal implant device with multi-point retention and its application". Technical Field

[0003] This invention relates to the technical field of human oral medicine, and more specifically, to a multi-point retention two-stage root implant device and its application. Background Technology

[0004] With the increasing sophistication of 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 canal implants have been developed in the field of oral implantology in recent years. Due to their minimally invasive nature, preservation of the original tooth alveolar bone shape, preservation of the original tooth mucosa shape without sacrificing aesthetic requirements, and mechanics and corresponding functional structure comparable to the original tooth, they are highly praised by dentists and patients in the field of oral implantology who require immediate implantation after tooth extraction.

[0005] However, current root-mounted dental implant techniques require high morphological quality of the remaining alveolar bone in the original tooth. The integrity and depth of the alveolar socket walls of the tooth to be extracted must be ensured, and a percussion-compression retention method is used to guarantee the initial stability of the implanted root. Otherwise, implant failure is highly likely. Furthermore, RAI (Root Analogue Impulse) implantation is based on immediate extraction and implantation; if it fails, it cannot be performed again. In case selection, teeth with shallow alveolar sockets or buccal / lingual alveolar bone defects due to periodontal disease or chronic periapical inflammation are the most in need of RAI implantation. Because of these conditions, the initial stability of the RAI cannot be guaranteed. Existing single-segment RAI implants, in some patients with occlusal loss, can fail due to occlusal trauma during chewing, disrupting the initial stability of the RAI. This is the main reason why RAI is not yet widely used in clinical dentistry. Summary of the Invention

[0006] The purpose of this invention is to provide a two-stage root-type implant device with multi-point retention and its application, which solves the problems of initial instability of RAI in the prior art and the darkening of the gingiva after implantation, which easily leads to peri-implantitis.

[0007] The technical solution of the present invention is: to provide a multi-point retention two-stage root implant device, which is a RAI, comprising a root implant, a transgingival collar, retention screws, healing screws, restorative screws and restorative abutments.

[0008] A root-type implant consists of a transgingival portion and an implant portion. The implant portion is placed in the alveolar socket, while the transgingival portion is placed in the gingiva outside the alveolar socket. A restoration retention channel is set inside the transgingival portion, and the restoration abutment is fixedly connected to the transgingival portion by restoration screws. A transgingival collar is placed on the outside of the transgingival portion.

[0009] Healing screws are used to install on dental implants during the osseointegration period. The threaded end of the healing screw is fixed in the restoration retention channel, and the head end of the healing screw is located above the transgingival portion. The threaded end of the healing screw matches the restoration retention channel.

[0010] The restorative screw is used to install on the root canal after osseointegration. The threaded end of the restorative screw is fixed in the restorative retention channel, the head end of the restorative screw is located above the transgingival portion, and the restorative abutment is sleeved on the outside of the head end of the restorative screw.

[0011] The implant has at least one retention screw channel inside. The entrance of the retention screw channel is located at the bottom of the retention channel or on the side wall of the repaired retention channel, and the exit of the retention screw channel is located on the side wall of the implantation part.

[0012] One end of the retention screw is inserted into the alveolar bone through the retention screw channel, and the other end is placed in the retention screw channel and fixedly connected to the retention screw channel.

[0013] Furthermore, the transgingival collar is a circular cylinder parallel to the gingiva. The transgingival collar is fitted on the outside of the transgingival portion and is located between the horizontal section of the alveolar bone and the horizontal section of the gingiva. The transgingival collar is made of zirconium oxide material and its surface is glazed.

[0014] Furthermore, the head of the repair screw has a V-shaped structure, with the diameter of the end near the perforated portion being smaller than the diameter of the top end. The repair abutment is a ring-shaped structure tightly fitted onto the outside of the head of the repair screw. Inside the repair abutment, a V-shaped repair screw retention channel is provided that matches the shape of the head of the repair screw. The diameter of the end of the repair screw retention channel near the perforated portion is smaller than the diameter of the other end. The inner wall of the repair screw retention channel is a smooth surface. The smaller diameter opening of the repair screw retention channel corresponds to the position of the repair retention channel.

[0015] Furthermore, the entrance to the repair retention channel is located on the upper surface of the perforated portion, and the repair retention channel extends from the upper surface of the perforated portion to the interior of the perforated portion near the implantation portion.

[0016] At least one retention groove is provided on the occlusal surface at the upper end of the transgingival portion, and a retention protrusion matching the retention groove is provided at the lower end of the restorative abutment. The retention groove is used to engage with the retention protrusion to fix the restorative abutment.

[0017] Furthermore, the sidewall of the repair fixation bolt channel is provided with internal threads that match the healing screw and the repair screw, and the sidewall of the fixation screw channel is provided with internal threads that match the fixation screw.

[0018] The multi-point retention two-stage root implant device also includes a crown, which is installed outside the restorative abutment.

[0019] The technical solution of the present invention also provides an application of a multi-point retention two-stage root canal implant device, including:

[0020] Step 1: Obtain three-dimensional structural data at the location of the affected tooth, extract the root morphology of the affected tooth based on the three-dimensional structural data, and establish a root-type implant model that is consistent with the root morphology of the affected tooth; wherein, the three-dimensional structural data includes alveolar bone shape and density;

[0021] Step 2: Based on the shape and density of the alveolar bone, select at least one point in the direction around the alveolar socket as a fixation point. Set up a repair retention channel in the root implant model. Set up a retention screw channel in the root implant model according to the location of the fixation point. The entrance of the retention screw channel is located inside the repair retention channel, and the exit of the retention screw channel corresponds to the fixation point. Perform 3D printing on the root implant model.

[0022] Step 3: Obtain the position of the upper horizontal plane edge of the alveolar bone and the gingival height based on the three-dimensional structural data. Based on the position of the upper horizontal plane edge of the alveolar bone and the gingival height, obtain the size of the transgingival collar. Make the transgingival collar according to the size and glaze its tissue surface.

[0023] Step 4: Make the corresponding healing screw according to the size of the repaired retaining bolt channel, and make the corresponding retaining screw according to the size of the retaining screw channel.

[0024] Step 5: Based on the three-dimensional structural data and the dimensions of the root-type implant, a model of the restorative abutment is established. According to the dimensions of the restorative retention channel and the preset convergence angle, the restorative screw retention channel is set in the three-dimensional model of the restorative abutment, and the restorative abutment is 3D printed. The preset convergence angle is the inclination angle of the sidewall of the restorative screw retention channel.

[0025] Step 6: Make a repair screw according to the dimensions of the repair screw retaining channel and the repair retaining channel, so that the head end of the repair screw matches the repair screw retaining channel and the thread end matches the repair retaining channel.

[0026] Step 7: Implant the completed multi-point retention two-stage root canal implant device.

[0027] Furthermore, step 2 specifically includes:

[0028] The root-type implant includes a transgingival portion and an implantation portion. Based on the overall shape and density of the alveolar bone at the location of the affected tooth, alveolar bone thickness thresholds and alveolar bone density thresholds are set. A region around the alveolar socket of the affected tooth with a thickness and density that meet the alveolar bone thickness and density thresholds is selected as the target region. With the alveolar socket as the center, at least one point is selected in the target region as a fixation point. With the long axis of the three-dimensional model of the root-type implant as the center line, a repair retention channel with an internal wire is set from the center of the upper surface of the transgingival portion to the position inside the transgingival portion near the implantation portion. Based on the position of the fixation point, a retention screw channel with an internal wire is set from the inner wall of the repair retention channel to the position corresponding to the fixation point on the side wall of the implantation portion.

[0029] A row of hemispherical cavities of a predetermined size are set on the side wall of the implanted portion at a predetermined distance from the upper horizontal plane of the alveolar bone, and a retention groove is set at at least one point on the outer wall of the upper end of the transgingival portion.

[0030] Furthermore, step 3 specifically includes:

[0031] Using a predetermined distance from the edge of the upper horizontal plane of the alveolar bone as the boundary, the distance from this boundary to the outer wall of the transgingival portion is taken as the thickness of the side wall of the transgingival collar, and the gingival height is taken as the height of the transgingival collar, thus obtaining the overall size of the transgingival collar. Based on this size, the transgingival collar 2 is 3D printed using zirconia.

[0032] Furthermore, step 5, which involves establishing the model of the repair abutment, specifically includes:

[0033] Using a predetermined distance from the edge of the horizontal plane above the gingiva as the boundary, the distance from this boundary to the center of the restoration retention channel is used as the radius of the restoration abutment. A model of the restoration abutment is then established, and a retention protrusion matching the retention groove is set at the lower end of the restoration abutment model, at the position corresponding to the retention groove.

[0034] Furthermore, in step 5, based on the dimensions of the repair retaining channel and the preset convergence angle, the repair screw retaining channel is set in the 3D model of the repair base, specifically including:

[0035] A V-shaped, smooth-surfaced repair screw retaining channel is set at the center of the repair base model, so that the opening at the lower end of the repair screw retaining channel corresponds to the position of the repair retaining channel and has the same diameter, and the preset convergence angle ranges from 3° to 5°.

[0036] The beneficial effects of this invention are:

[0037] The technical solution of this invention sets multiple retention screws on the root canal implant device, which solves the problem of low initial stability of RAI in the prior art due to shallow alveolar socket, buccal and lingual bone defects, and curved root compensation by using a multi-point retention method. Multiple retention screws can form cross-locking with the implanted alveolar portion in different directions centered on the RAI, thereby enhancing the initial stability of the RAI. At the same time, the two-stage design allows the abutment and crown to be installed after the RAI has stabilized, which solves the problem of chewing trauma damaging the initial stability of the RAI after implantation in patients with occlusal loss.

[0038] The technical solution of this invention involves placing an enamelized all-ceramic transgingival collar around the exposed re-implantation artery (RAI) outside the alveolar bone. This solves the problems of gingival discoloration and blackening due to oxidized metal ion precipitation after RAI implantation, and the easy adhesion of bacteria at the RAI transgingival site causing peri-implantitis. This technical solution allows for immediate implantation after bone grafting in teeth with buccal and lingual bone defects, enabling most extraction-requiring teeth to be implanted immediately. It has a wide range of applications and a high clinical success rate. This technical solution expands the clinical indications for RAI, enabling more widespread application in painless, minimally invasive, safe, and personalized implantation of teeth requiring extraction. It improves the long-term survival rate of dental implants, shortens the implantation cycle, and makes it possible to maintain the original aesthetic, mechanical, and anatomical structure of the original tooth. Attached Figure Description

[0039] The advantages of the above and / or additional aspects of the present invention will become apparent and readily understood in the description of the embodiments taken in conjunction with the following drawings, wherein:

[0040] Figure 1 is a schematic diagram of a multi-point retention two-stage root canal implant device according to an embodiment of the present invention.

[0041] Figure 2 is a lateral section view of a root-type implant according to an embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of the structure of a perforated collar according to an embodiment of the present invention;

[0043] Figure 4 is a schematic diagram of the structure of a retaining screw according to an embodiment of the present invention;

[0044] Figure 5 is a schematic diagram of the structure of a healing screw according to an embodiment of the present invention;

[0045] Figure 6 is a schematic diagram of the structure of a repair screw according to an embodiment of the present invention;

[0046] Figure 7 is a schematic diagram of the structure of the repair base according to an embodiment of the present invention;

[0047] Figure 8 is a schematic diagram of the structure of a dental crown according to an embodiment of the present invention.

[0048] Among them, 1-root-type implant, 11-transgingival portion, 111-repair retention channel, 112-retention groove, 12-implantation portion, 121-retention screw channel, 2-transgingival collar, 3-retention screw, 4-healing screw, 5-repairing screw, 6-repairing abutment, 61-repairing screw retention channel, 62-retention protrusion, 7-crown, 8-gingiva, 9-alveolar bone. Detailed Implementation

[0049] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other.

[0050] In the following description, many specific details are set forth in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0051] This embodiment provides a two-stage root canal implant device with multi-point fixation and its application. The software used to manufacture the components of the root canal implant device includes Mimics Medical 21.0, Geomagic Wrap 2021, and Design X 2022.0. Mimics Medical 21.0 is used for medical image processing and 3D modeling, and can extract anatomical structures from medical images such as CT scans. Geomagic Wrap 2021 is used to process and edit 3D scan data, and can convert this data into high-quality models. Design X 2022.0 directly edits and optimizes data, and is suitable for creating complex shapes and designs.

[0052] As shown in Figures 1 to 8, this embodiment provides a multi-point retention two-stage root implant device, which includes a first implant segment below the gingiva and a second implant segment above the gingiva. The first implant segment includes a root implant 1, a transgingival collar 2, a retention screw 3, and a healing screw 4. The second implant segment includes a restorative screw 5, a restorative abutment 6, and a crown 7.

[0053] The root-type implant 1 is a gingival-level anatomical root used for implantation into the alveolar socket. The root-type implant 1 includes a superior transgingival portion 11 and a inferior implant portion 12, which are integrated into one unit. The transgingival portion 11 is located in the gingiva outside the alveolar socket, and the implant portion 12 is implanted into the alveolar socket of the affected tooth. After the root-type implant 1 is implanted into the alveolar socket, the interface between the transgingival portion 11 and the implant portion 12 is flush with the horizontal plane of the alveolar bone.

[0054] A cylindrical restoration retention channel 111 with an internal wire is provided at the center of the transgingival portion 11. The entrance of the restoration retention channel 111 is located on the upper surface of the transgingival portion 11, and the restoration retention channel 111 extends from the upper surface of the transgingival portion 11 to a position inside the transgingival portion 11 near the implant portion 12 (i.e., a position inside the transgingival portion 11 near the alveolar bone level). The restoration retention channel 111 is used to install the healing screw 4 during the osseointegration period and to install the restoration screw 5 after osseointegration. At least one retention groove 112 is provided on the outer wall of the upper end of the transgingival portion 11. The retention groove 112 is used to engage with the restoration abutment 6 to fix the restoration abutment 6 and prevent it from rotating during installation.

[0055] In this embodiment, when setting the repair retention channel 111, the cylindrical repair retention channel 111 with internal wire can be drilled downwards to the maximum extent possible, starting from the center of the upper surface of the transgingival portion 11, with the long axis of the root implant 1 as the center line. The lower end of the repair retention channel can reach the horizontal plane of the alveolar bone. The purpose of drilling downwards to the maximum extent possible when setting the repair retention channel 111 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, it can resist the influence of occlusal force, lateral force and other forces, and will not be damaged or dislodged due to force.

[0056] On the outer wall of the implant portion 12, at a predetermined distance from the upper surface of the alveolar bone (i.e., at a predetermined distance from the upper edge of the alveolar socket, which is a hole extending downward from the upper surface of the alveolar bone to accommodate the tooth root), a row of hemispherical sockets (i.e., a row of hemispherical sockets arranged continuously at a predetermined interval) are provided. These hemispherical sockets are used to increase the osseointegration area between the implant portion 12 and the alveolar bone, and to improve the stability of the root-type implant 1, thereby enhancing the secondary stability of the entire two-stage root-type implant device. The predetermined distance can be set to 1 mm, the diameter of the hemispherical socket can be set to 1 mm, and since it is hemispherical, the socket depth is 0.5 mm.

[0057] The root-type implant 1 has at least one retention screw channel 121 with an internal wire inside. The inlet of the retention screw channel 121 is located at the bottom of the repair retention channel 111 or on the side wall of the repair retention channel 111, and the outlet of the retention screw channel 121 is located on the side wall of the implant portion 12. The retention screw channel 121 passes obliquely through the root-type implant 1 from the inlet inside the repair retention channel 111 to the outlet on the side wall of the implant portion 12. The retention screw channel 121 is used to install the retention screw 3.

[0058] The threaded end (i.e., the tip) of the retaining screw 3 is tapered. This tapered threaded end has self-tapping properties against the alveolar bone, allowing the retaining screw 3 to rotate and cut the alveolar bone during implantation, thus successfully implanting into the alveolar bone. The head end of the retaining screw 3 is provided with a groove for fastening the screw. The thread on the outer wall of the screw of the retaining screw 3 matches the internal thread of the retaining screw channel 121. The number of retaining screws 3 is the same as the number of retaining screw channels 121.

[0059] The threaded end of the retention screw 3 is implanted into the alveolar bone through the retention screw channel 121, and the head end of the retention screw 3 is located in the retention screw channel 121 and is fixedly connected to the retention screw channel 121. Specifically, the retention screw 3 enters the retention screw channel 121 through the inlet end of the repaired retention channel 111 bottom surface, passes through the root implant 1 along the retention screw channel 121, and is implanted into the alveolar bone through the outlet end of the implant portion 12 sidewall. The retention screw 3 can form at least one cross-locking with the implant portion 12 in the alveolar bone, which enhances the stability of the root implant 1 and thus ensures the initial stability of the entire two-stage root implant device.

[0060] In this embodiment, the entrance of the repair fixation channel 111 can be flexibly set inside the repair fixation channel 111. For example, when it is inconvenient to screw the fixation screw 3 in the fixation screw channel 121 from the bottom of the repair fixation channel 111 to the side wall of the implanted part 12 (that is, when the fixation screw channel 121 with the entrance end set at the bottom of the fixation channel 111 cannot be screwed into the fixation screw 3 due to external influence during operation), the entrance end of the repair fixation channel 111 can be set on the side wall of the repair fixation channel 111, and the fixation screw channel 121 is opened at the position from the side wall of the repair fixation channel 111 to the side wall of the implanted part 12.

[0061] The transgingival collar 2 is a parallel transgingival ring cylinder that fits around the outside of the transgingival portion 11 and is positioned between the upper horizontal plane of the alveolar bone and the upper horizontal plane of the gingiva. 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 gingiva. The transgingival collar 2 is made of zirconia material and its surface is enamel-coated. After the root-type implant 1 is implanted into the alveolar bone, the transgingival collar 2 is bonded to the outside of the transgingival portion 11. A certain gap is reserved between the outer sidewall of the transgingival collar 2 and the edge of the horizontal cross-section of the alveolar bone, which can be set to 0.5 mm.

[0062] The healing screw 4 is used to fix the implant 1 to the dental implant 1 through the repair retention channel 111 during the osseointegration period. This prevents food debris from entering the repair retention channel 111 and protects the implant, promotes soft tissue healing, and maintains space to prepare for the subsequent installation of the repair screw 5, repair abutment 6, and crown 7. The threaded end of the healing screw 4 is fixed in the repair retention channel 111, and the head end is located above the perforated portion 11. The threaded end of the healing screw 4 matches the repair retention channel 111. Specifically, the size of the threaded end of the healing screw 4 matches the repair retention channel 111, and the thread on the outer wall of the threaded end matches the internal thread of the repair retention channel 111. The head end of the healing screw 4 is provided with a groove for tightening itself.

[0063] The restorative screw 5 is used to fix the root-type implant 1 through the restorative retention channel 111 after osseointegration to support the restorative abutment 6 and crown 7. The threaded end of the restorative screw 5 is fixed in the restorative retention channel 111, and the head end is located above the transgingival portion 11. The threaded end of the restorative screw 5 matches the restorative retention channel 111. The size of the threaded end of the restorative screw 5 matches the restorative retention channel 111, and the thread on the outer wall of the threaded end matches the internal thread of the restorative retention channel 111. The head end of the restorative screw 5 has a V-shaped structure, and the diameter of the end near the transgingival portion 11 is smaller than the diameter of its tip.

[0064] The restorative abutment 6 is a ring-shaped structure that fits tightly onto the head end of the restorative screw 5. A restorative screw retention channel 61 is provided in the center of the restorative abutment 6. The shape of the restorative screw retention channel 61 matches the shape of the head end of the restorative screw 5. The restorative screw retention channel 61 is a V-shaped channel, and its diameter near the end of the perforated portion 11 is larger than the diameter of its top end. The inner wall of the restorative screw retention channel 61 is a smooth surface and does not have an internal thread. The smaller diameter opening of the restorative screw retention channel 61 corresponds to the position of the restorative retention channel 111 at the upper end of the perforated portion 11, and the edge of the smaller diameter opening of the restorative screw retention channel 61 is flush with the edge of the opening of the restorative retention channel 111 (i.e., the two opening edges are flush with each other and remain on the same horizontal plane).

[0065] In this embodiment, the convergence angle (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 fixing bolt channel 61 relative to the vertically downward straight line is 3° to 5°.

[0066] The lower end of the restorative abutment 6 is provided with a retention protrusion 62 that matches the retention groove 112 at the upper end of the perforated portion 11. The retention protrusion 62 is used to engage with the retention groove 112 to fix the restorative abutment 6. The shape of the retention protrusion 62 matches the retention groove 112, and the number of retention protrusions 62 and retention grooves 112 are the same. The restorative abutment 3 is fixedly connected to the perforated portion 11 by a restorative screw 5. During installation, the restorative abutment 6 is first fixed to the root-type implant 1 by the matching relationship between the retention protrusion 62 and the retention groove 112. Then, the restorative screw 5 is screwed into the root-type implant 1 through the restorative screw retention channel 61, so that the restorative screw 5 and the restorative abutment 6 form a whole.

[0067] The crown 7 is installed on the outside of the whole formed by the restorative screw 5 and the restorative abutment 6.

[0068] In this embodiment, the shape of the root-type implant 1 is consistent with the shape of the root of the affected tooth. The root-type implant 1 can be fabricated in the following way:

[0069] CBCT diagnostic images of the affected tooth were taken. The CBCT data was imported to a USB drive and then into Mimics Medical 21.0 software. Mimics Medical 21.0 software was used to accurately extract the root morphology of the affected tooth using 3D rendering technology. The extracted root morphology file was imported into Geomagic Wrap 2021 software for surface curvature processing. The surface curvature file was then imported into Design X 2022.0 software to design a model of a matching root-type implant 1 that matches the root morphology of the affected tooth. A 0.5mm hole and a central cavity were designed on the root surface. Finally, the designed file was saved in STL mode and printed using a FastLayer printer.

[0070] As shown in Figure 1, this embodiment provides an application of a multi-point retention two-stage root canal implant device, including:

[0071] Step 1: Take CBCT images of the oral cavity of the affected tooth, obtain three-dimensional structural data of the affected tooth location through CBCT images, extract the root morphology of the affected tooth based on the three-dimensional structural data, and establish a model of root-type implant 1 that is consistent with the root morphology of the affected tooth. The three-dimensional structural data includes alveolar bone shape and density data, and gingival distribution data around the affected tooth.

[0072] The three-dimensional structural data at the location of the affected tooth includes alveolar bone shape and density data, alveolar socket structure, gingival distribution around the affected tooth, spatial proximity data between the affected tooth and adjacent teeth, and spatial proximity data between the affected tooth and opposing teeth. The CBCT data is imported into Mimics Medical 21.0 software, and the root morphology of the affected tooth is accurately extracted using Mimics Medical 21.0 software. A model of root-type implant 1 with the same root morphology as the affected tooth is established. The model of root-type implant 1 is imported into Geomagic Wrap 2021 software, and the surface of the model is processed using Geomagic Wrap 2021 software to adapt the implanted part 12 (i.e., the implanted tooth root) to the alveolar socket, ensuring that the final implant can be tightly integrated with the alveolar socket.

[0073] Step 2: Based on the alveolar bone shape and density data, determine the target area for setting the fixation point around the alveolar socket. Select at least one point in the target area as the fixation point. Set the repair retention channel 111 in the root implant 1 model. Set the retention screw channel 121 in the root implant 1 model according to the location of the fixation point. The entrance of the retention screw channel 121 is located inside the repair retention channel 111, and the exit of the retention screw channel 121 corresponds to the fixation point (i.e., the exit of the retention screw channel 121 is located at the fixation point). Then, 3D print the root implant 1 model.

[0074] The surface-curved model was imported into Design X 2022.0 software, and the root implant 1 model was designed using Design X 2022.0 software. Specifically, the gingival height at the location of the affected tooth was 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 location of the affected tooth. The gingival height was used as the height of the transgingival portion 11. Based on the overall shape and density of the alveolar bone at the location of the affected tooth, alveolar bone thickness and density thresholds are set. A region around the alveolar socket of the affected tooth, meeting both the thickness and density thresholds, is selected as the target area for setting retention points. Due to the diversity of alveolar bone, the distribution of the target area is uneven. Therefore, at least one point needs to be selected as a retention point within the target area, centered on the alveolar socket, ensuring that the directions of different retention points are different. After selecting the retention points, using the long axis of the root implant model 1 as the center line, a restorative retention channel 111 with an internal wire is set, starting from the center of the upper surface of the transgingival portion 11 and ending at a position inside the transgingival portion 11 near the implant portion 12. Based on the location of the fixation points, a fixation screw channel 121 with an internal wire is set from the inner wall of the repair fixation channel 111 to the position corresponding to the fixation point on the side wall of the implant part 12. The number of fixation screw channels 121 is the same as the number of fixation points. A row of hemispherical cavities with a radius of 0.5 mm is set on the side wall of the implant part 12 at a predetermined distance from the upper horizontal plane of the alveolar bone. At least one point is selected on the outer wall of the upper end of the transgingival part 11 to set a fixation groove 112 for fixing the repair abutment 6, thus obtaining the final model of the root implant 1. The final model data of the root implant 1 is saved in STL mode, and the solid of the root implant 1 is printed using a FastLayer printer.

[0075] Step 3: Obtain the position of the upper horizontal plane edge of the alveolar bone and the gingival height based on the gingival distribution data around the affected tooth. Based on the position of the upper horizontal plane edge of the alveolar bone and the gingival height, obtain the size of the transgingival collar 2. Make the transgingival collar 2 according to the size and glaze its tissue surface.

[0076] Information on the position of the upper horizontal plane edge of the alveolar bone is obtained based on the gingival distribution data around the affected tooth. The position at a predetermined distance from the upper horizontal plane edge of the alveolar bone is used as the boundary. The distance from this boundary to the outer wall of the transgingival portion 11 is used as the thickness of the side wall of the transgingival collar 2. The gingival height is used as the height of the transgingival collar 2. The data of the outer wall diameter, inner wall diameter and height of the transgingival collar 2 are obtained, which is the overall size. The height of the transgingival collar 2 is the same as the height of the transgingival portion 11, and the predetermined distance is 0.5 mm. Based on this size, the transgingival collar 2 is 3D printed using zirconia.

[0077] Step 4: Based on the dimensions of the retaining screw channel 121, fabricate the corresponding retaining screw 3; based on the dimensions of the repair retaining screw channel 111, fabricate the corresponding healing screw 4.

[0078] The diameter of the retention screw 3 is determined based on the diameter of the retention screw channel 121, ensuring that the retention screw 3 matches the retention screw channel 121. The size of the healing screw 4 is determined based on the size of the repair retention channel 111, ensuring that the size of the thread end of the healing screw 4 matches the size of the repair retention channel 111, and that the width of the head end of the healing screw 4 is greater than the diameter of the repair retention channel 111. This prevents food debris from entering the repair retention channel 111 after the healing screw 4 is installed. In this embodiment, after obtaining the dimensions of the retention screw channel 121 and the repair retention channel 111, the corresponding retention screw 3 and healing screw 4 can be fabricated in a machining center (referring to an operating center equipped with high-end manufacturing equipment used to manufacture two-stage root canal implant devices).

[0079] Step 5: Based on the three-dimensional structural data and the dimensions of the root implant 1, a model of the restorative abutment 6 is established. According to the dimensions of the restorative retention channel 111 and the preset cohesion angle, the restorative screw retention channel 61 is set in the three-dimensional model of the restorative abutment 6, and the restorative abutment (6) is 3D printed. The preset cohesion angle is the inclination angle of the side wall of the restorative screw retention channel 61 (i.e., the inclination angle of the side wall generatrix relative to the vertical line).

[0080] Based on the gingival distribution data around the affected tooth, the position data of the horizontal edge of the upper gingival plane is obtained. Taking the position at a predetermined distance from the horizontal edge of the upper gingival plane as the boundary, the distance from this boundary to the center of the restoration retention channel 111 is used as the radius of the restoration abutment 6. A model of the restoration abutment 6 is established. At the lower end of the model of the restoration abutment 6, at the position corresponding to the retention groove 112, a retention protrusion 62 matching the retention groove 112 is set. A V-shaped and smooth restoration screw retention channel 61 is set at the center of the model of the restoration abutment 6, so that the opening at the lower end of the restoration screw retention channel 61 corresponds to the position of the restoration retention channel 111 and has the same diameter. The tilt angle of the V-shaped restoration screw retention channel 61 is equal to the preset convergence angle, which is in the range of 3° to 5°. The final model of the restoration abutment 6 is 3D printed.

[0081] In this embodiment, the height of the abutment 6 is a predetermined height. This predetermined height needs to be specifically determined based on data such as the distance between the opposing teeth and the distribution of occlusal force at the affected tooth in the actual case. The specific determination process is the existing method. The crown 7 needs to be specifically made based on the three-dimensional structural data and impression data of the affected tooth in the actual case. The manufacturing process is the existing method and will not be described here.

[0082] Step 6: Make a repair screw (5) according to the dimensions of the repair retaining channel 111 and the repair screw retaining channel 61, so that the head end of the repair screw (5) matches the repair screw retaining channel 61 and the thread end matches the repair retaining channel 111.

[0083] The dimensions of the repair screw 5 are determined based on the dimensions of the repair retaining channel 111 and the repair screw retaining channel 61, so that the dimensions of the thread end of the repair screw 5 match the dimensions of the repair retaining channel 111 and the dimensions of the thread end of the repair screw 5 match the dimensions of the V-shaped repair screw retaining channel 61.

[0084] Step 7: The various parts that have been fabricated above are combined to form a multi-point retention two-stage root implant device, and the fabricated multi-point retention two-stage root implant device is implanted.

[0085] In this embodiment, after the fabrication of the multi-point retention two-stage root canal implant device is completed, the dentist implants the multi-point retention two-stage root canal implant device. The implantation process is as follows:

[0086] After the extraction of the tooth to be implanted, the root-mounted implant 1 is placed in the alveolar socket of the extracted tooth. The retention screw 3 is screwed into the alveolar bone through the entrance of the retention screw channel 111 inside the restoration retention channel to fix the root-mounted implant. A transgingival collar 2 is placed on the outer side of the transgingival portion 11 of the upper part of the root-mounted implant 1. During the osseointegration period, the healing screw 4 is screwed into the restoration retention channel 111 to prevent foreign objects from entering the root-mounted implant 1. After the root-mounted implant 1 has achieved stable osseointegration with the alveolar bone (and bone... After the abutment is formed, unscrew the healing screw 4; insert the retention protrusion 62 of the restoration abutment 6 into the retention groove 112 on the occlusal surface of the upper end of the root implant 1 to complete the docking of the restoration abutment 6 and the root implant 1; screw the restoration screw 5 through the V-shaped restoration screw retention channel 61 in the center of the restoration abutment 6 and into the restoration retention channel 111 in the root implant 1 to tightly connect the restoration abutment 6 and the root implant 1 together; bond the matching crown 7 to the restoration abutment 6 to complete the entire RAI restoration process.

[0087] In this embodiment, the perforated collar 2 is 3D printed using zirconia and applied after glazing on the tissue surface. This solves the problem of the gingiva turning black and unsightly due to oxidation caused by the precipitation of metal ions at the perforated area. At the same time, the smooth surface after glazing is less likely to retain bacteria, which can effectively prevent peri-implantitis.

[0088] In this invention, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0089] The shapes of the components in the accompanying drawings are schematic and may differ from their actual shapes. The drawings are only used to illustrate the principles of the present invention and are not intended to limit the present invention.

[0090] Although the invention has been disclosed in detail with reference to the accompanying drawings, it should be understood that these descriptions are merely exemplary and not intended to limit the application of the invention. The scope of protection of the 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 invention.

Claims

1. A two-stage root canal implant device with multi-point retention, characterized in that, The multi-point retention two-stage root implant device includes a root implant (1), a transgingival collar (2), retention screws (3), healing screws (4), restorative screws (5), and a restorative abutment (6). The root-type implant (1) includes a transgingival portion (11) and an implant portion (12). The implant portion (12) is located in the alveolar socket, and the transgingival portion (11) is located in the gingiva outside the alveolar socket. A repair retention channel (111) is provided inside the transgingival portion (11). The repair abutment (6) is fixedly connected to the transgingival portion (11) by the repair screw (5). The transgingival collar (2) is fitted on the outside of the transgingival portion (11). The healing screw (4) is used to be installed on the root implant (1) during the osseointegration period. The threaded end of the healing screw (4) is fixed in the restoration retention channel (111). The head end of the healing screw (4) is located above the transgingival portion (11). The threaded end of the healing screw (4) matches the restoration retention channel (111). The restorative screw (5) is used to be installed on the root implant (1) after osseointegration. The threaded end of the restorative screw (5) is fixed in the restorative retention channel (111). The head end of the restorative screw (5) is located above the transgingival portion (11). The restorative abutment (6) is sleeved on the outside of the head end of the restorative screw (5). The root-type implant (1) is provided with at least one retention screw channel (121), the entrance of the retention screw channel (121) is located at the bottom of the retention channel (111) or on the side wall of the restorative retention channel (111), and the exit of the retention screw channel (121) is located on the side wall of the implant portion (12). One end of the retaining screw (3) is implanted into the alveolar bone through the retaining screw channel (121), and the other end is located in the retaining screw channel (121) and fixedly connected to the retaining screw channel (121).

2. The multi-point retention two-stage root canal implant device as described in claim 1, characterized in that, The gingival collar (2) is a parallel circular cylinder that passes through the gum. The gingival collar (2) is fitted on the outside of the gingival portion (11) and is located between the horizontal section of the alveolar bone and the horizontal section of the gum. The gingival collar (2) is made of zirconium oxide material and its surface is glazed.

3. The multi-point retention two-stage root canal implant device as described in claim 1, characterized in that, The head end of the repair screw (5) has a V-shaped structure, and the diameter of the end near the gingival portion (11) is smaller than the diameter of its top end. The repair base (6) is a ring-shaped structure tightly fitted on the outside of the head end of the repair screw (5). The repair base (6) is provided with a V-shaped repair screw retention channel (61) that matches the shape of the head end of the repair screw (5). The diameter of the end of the repair screw retention channel (61) near the gingival portion (11) is smaller than the diameter of the other end. The inner wall of the repair screw retention channel (61) is a smooth surface. The smaller diameter opening of the repair screw retention channel (61) corresponds to the position of the repair retention channel (111).

4. The multi-point retention two-stage root canal implant device as described in claim 1, characterized in that, The entrance of the repair retention channel (111) is located on the upper surface of the transgingival portion (11), and the repair retention channel (111) extends from the upper surface of the transgingival portion (11) to the interior of the transgingival portion (11) near the implant portion (12). At least one retention groove (112) is provided on the occlusal surface at the upper end of the transgingival portion (11), and a retention protrusion (62) matching the retention groove (112) is provided at the lower end of the restorative abutment (6). The retention groove (112) is used to engage with the retention protrusion (62) to fix the restorative abutment (6).

5. The multi-point retention two-stage root canal implant device as described in claim 1, characterized in that, The repair fixation channel (111) sidewall is provided with an internal thread that matches the healing screw (4) and the repair screw (5), and the fixation screw channel (121) sidewall is provided with an internal thread that matches the fixation screw (3); The multi-point retention two-stage root implant device also includes a crown (7), which is installed outside the restorative abutment (6).

6. The application of a multi-point retention two-stage root canal implant device, characterized in that, The applications include: Step 1: Obtain three-dimensional structural data at the location of the affected tooth, extract the root morphology of the affected tooth based on the three-dimensional structural data, and establish a model of a root-type implant (1) that is consistent with the root morphology of the affected tooth; wherein, the three-dimensional structural data includes alveolar bone shape and density; Step 2: Based on the shape and density of the alveolar bone, select at least one point in the direction around the alveolar socket as a fixation point. Set up a repair fixation channel (111) in the root implant (1) model. Set up a fixation screw channel (121) in the root implant (1) model according to the location of the fixation point. The entrance of the fixation screw channel (121) is located inside the repair fixation channel (111), and the exit of the fixation screw channel (121) corresponds to the fixation point. 3D print the root implant (1) model. Step 3: Obtain the position of the upper horizontal plane edge of the alveolar bone and the gingival height based on the three-dimensional structural data. Based on the position of the upper horizontal plane edge of the alveolar bone and the gingival height, obtain the size of the transgingival collar (2). Make the transgingival collar (2) according to the size and glaze its tissue surface. Step 4: Make the corresponding healing screw (4) according to the size of the repair fixation channel (111), and make the corresponding fixation screw (3) according to the size of the fixation screw channel (121). Step 5: Based on the three-dimensional structural data and the dimensions of the root implant (1), a model of the restorative abutment (6) is established. According to the dimensions of the restorative retention channel (111) and the preset convergence angle, the restorative screw retention channel (61) is set in the three-dimensional model of the restorative abutment (6), and the restorative abutment (6) is 3D printed. The preset convergence angle is the tilt angle of the sidewall of the restorative screw retention channel (61). Step 6: Make a repair screw (5) according to the dimensions of the repair screw retaining channel (61) and the repair retaining channel (111), so that the head end of the repair screw (5) matches the repair screw retaining channel (61) and the thread end matches the repair retaining channel (111). Step 7: Implant the completed multi-point retention two-stage root canal implant device.

7. The application of the multi-point retention two-stage root canal implant device as described in claim 6, characterized in that, Step 2 specifically includes: The root-type implant (1) includes a transgingival portion (11) and an implant portion (12). Based on the overall shape and density of the alveolar bone at the location of the affected tooth, alveolar bone thickness threshold and alveolar bone density threshold are set. A region around the alveolar socket of the affected tooth with a thickness reaching the alveolar bone thickness threshold and a density reaching the alveolar bone density threshold is selected as the target region. At least one point is selected in the target region with the alveolar socket as the center as the fixation point. With the long axis of the three-dimensional model of the root-type implant (1) as the center line, a repair retention channel (111) with an inner wire is set from the central position of the upper surface of the transgingival portion (11) to the position inside the transgingival portion (11) near the implant portion (12). Based on the position of the fixation point, a retention screw channel (121) with an inner wire is set from the inner wall of the repair retention channel (111) to the position corresponding to the fixation point on the side wall of the implant portion (12). A row of hemispherical cavities of a predetermined size are set on the side wall of the implanted portion (12) at a predetermined distance from the upper end of the alveolar bone horizontal plane, and a retention groove (112) is set at at least one point on the outer wall of the upper end of the transgingival portion (11).

8. The application of the multi-point retention two-stage root canal implant device as described in claim 7, characterized in that, Step 3 specifically includes: Using a predetermined distance from the edge of the upper horizontal plane of the alveolar bone as the boundary, the distance from this boundary to the outer wall of the transgingival portion (11) is taken as the thickness of the side wall of the transgingival collar (2), and the gingival height is taken as the height of the transgingival collar (2) to obtain the overall size of the transgingival collar (2). Based on this size, the transgingival collar 2 is 3D printed using zirconia.

9. The application of the multi-point retention two-stage root canal implant device as described in claim 7, characterized in that, The specific steps in step 5 of establishing the model of the repair abutment (6) include: Using a predetermined distance from the edge of the upper gingival horizontal plane as the boundary, the distance from this boundary to the center of the restoration retention channel (111) is used as the radius of the restoration abutment (6). A model of the restoration abutment (6) is established, and a retention protrusion (62) matching the retention groove (112) is set at the lower end of the model of the restoration abutment (6) at the position corresponding to the retention groove (112).

10. The application of the multi-point retention two-stage root canal implant device as described in claim 7, characterized in that, In step 5, based on the dimensions of the repair retaining channel (111) and the preset cohesion angle, the repair screw retaining channel (61) is set in the three-dimensional model of the repair base (6), specifically including: A V-shaped and smooth repair screw retaining channel (61) is set at the center of the repair base (6) model, so that the opening at the lower end of the repair screw retaining channel (61) corresponds to the position of the repair retaining channel (111) and has the same diameter, and the preset convergence angle range is 3° to 5°.

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