Digitized guide plate for crown-direction reduction of residual dental in oral cavity and preparation method of digitized guide plate

Abstract

The invention discloses an oral cavity residual tooth crown reduction digital guide plate and a preparation method, and belongs to the technical field of oral medicine. The guide plate comprises a base plate used for covering and being embedded in a dental arch, a connecting piece is installed on the base plate, and a reset retention piece used for retention during reset of residual teeth is arranged on the connecting piece. When the guide plate is prepared, firstly, data information is collected, and dentition information, image information and face information of a patient are collected; modeling: performing virtual reconstruction on the oral cavity structure of the patient; and manufacturing a guide plate again, designing a digital guide plate according to the acquired data information and the virtual oral cavity structure, and manufacturing the digital guide plate. According to the invention, the residual tooth crown can be accurately guided to reset, and the reset angle, direction and depth of the residual tooth are ensured to be accurate; by utilizing personalized three-dimensional data of a patient, the guide plate can provide clear positioning and an accurate reduction path for residual dental crown directional reduction, and the technical problem that the residual dental crown directional reduction is high in requirement on an operator due to the fact that traditional residual dental crown directional reduction depends on experience of the operator is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of oral medicine, and in particular relates to a digital guide plate for crown repositioning of residual teeth in the oral cavity and a preparation method thereof. Background Art

[0002] In oral surgery, accurate reduction techniques are crucial for the subsequent restoration. Coronal reduction of teeth is often used to address tooth misalignment or loss caused by trauma, dislocation, root canal treatment, or other factors. Traditional coronal reduction methods often rely on the surgeon's experience and manual manipulation. The accuracy and stability of this reduction technique are limited by the operating precision and operating environment, and often contain certain errors. These errors not only affect the occlusal function after reduction, but may also lead to complications such as asymmetry and periodontal tissue damage, thus affecting the subsequent restoration process.

[0003] Currently, surgical crown reduction techniques primarily rely on direct surgical intervention or supplemental imaging techniques such as X-rays and CT scans to aid diagnosis and reduction. While imaging techniques can provide detailed information about the tooth, precise control of the reduction angle, direction, and depth during traditional surgery still relies on the surgeon's visual judgment and operational experience. This can lead to variability in reduction procedures between surgeons, making optimal reduction results difficult to achieve.

[0004] Furthermore, while there are some auxiliary tools and devices for tooth repositioning, such as surgical clamps and positioners, these devices are typically limited to a single fixed angle or direction and lack personalized, precise repositioning guidance. Existing technologies are unable to effectively adjust and guide the repositioning process based on the patient's oral structure and dental condition. Especially in complex cases, the accuracy and stability of repositioning remain significant issues. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a digital guide plate for crown repositioning of residual teeth in the oral cavity and a preparation method thereof, so as to at least solve some of the above-mentioned technical problems.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A digital guide for crown-oriented reduction of residual teeth in the oral cavity comprises a base plate for covering and being embedded in a dental arch. The invention is characterized in that a connecting piece is mounted on the base plate, and a reduction retaining piece is provided on the connecting piece for retaining the residual teeth during reduction.

[0008] Furthermore, the repositioning retaining member includes a supporting plate provided on the connecting member for supporting the remaining teeth;

[0009] Preferably, the top supporting plate and the connecting piece are an integrated structure.

[0010] Furthermore, the reduction retaining member includes a wrapping member adapted to and wrapping around the residual tooth crown;

[0011] Preferably, the wrapping member and the connecting member are an integrated structure.

[0012] Furthermore, the connecting member includes a connecting rod, the reset retaining member is located on the connecting rod; a connecting mechanism is provided between the connecting rod and the base plate;

[0013] Preferably, the connecting mechanism includes a pin provided on the base plate and a socket provided on the connecting rod; the socket is provided with a slot hole adapted to the pin, and the pin is plugged into the slot hole;

[0014] Preferably, a ball is provided on the socket.

[0015] A method for preparing a digital guide plate for crown repositioning of residual teeth in an oral cavity comprises the following steps:

[0016] Step 1: Data collection: collecting patient dentition information, image information, and facial information;

[0017] Step 2: Modeling, virtually reconstructing the patient's oral structure;

[0018] Step 3: Guide plate production: Based on the collected data information and virtual oral structure, a digital guide plate is designed and produced.

[0019] Furthermore, in step 1, the patient's dentition data is obtained by digital oral scanning or impression, and the dentition data includes the number, arrangement, shape and occlusal relationship of the teeth;

[0020] Preferably, in step 1, three-dimensional imaging technology is used to obtain oral, dental, and maxillofacial imaging information of the patient, and the imaging information can present the length, angle, and residual root morphology of the tooth root;

[0021] Preferably, in step 1, facial data of the patient is collected by three-dimensional facial scanning or digital photography, and the facial data includes facial morphology, bite position, and lip morphology.

[0022] Furthermore, in the step 2, when modeling, the following steps are included:

[0023] Step (1), virtual tooth arrangement;

[0024] Step (2), virtual alveolar socket morphology after tooth extraction;

[0025] Step (3): virtual reduction evaluation and optimization of the residual crown;

[0026] Step (4): Evaluation of virtual restoration effects.

[0027] Furthermore, in the step (1), when virtually arranging teeth, the positions of teeth that meet the patient's functional and aesthetic needs are virtually created based on the patient's dentition information and in accordance with the natural morphology, occlusal relationship, and facial features of the dentition;

[0028] Preferably, in step (2), when simulating the alveolar socket morphology after tooth extraction, the alveolar socket morphology after tooth extraction is simulated by software, and the operation path required for reduction is virtualized and the ideal position of the teeth after reduction is simulated according to the residual root length, angle and alveolar socket state.

[0029] Furthermore, in step (iii), when evaluating and optimizing the virtual reduction of the residual crown, a computer is used to simulate the reduction process, and the angle, direction and depth required for the reduction of the residual tooth are simulated according to the residual root morphology, and a preliminary evaluation is made as to whether the restoration conditions can be met based on the stability, occlusal function and aesthetic effect of the residual tooth after reduction;

[0030] Preferably, in said step (iv), when evaluating the virtual restoration effect, the shape of the residual tooth after reduction is simulated by software, and the structure and durability of the residual tooth after reduction are evaluated.

[0031] Furthermore, in step three, when making the guide plate, a three-dimensional model of the digital guide plate for residual crown reduction is designed based on the collected data information and the virtual oral structure, and the three-dimensional model of the digital guide plate for residual crown reduction is input into a 3D printer to print the digital guide plate for residual crown reduction;

[0032] Preferably, when designing a three-dimensional model of a digital guide plate for reducing the residual tooth crown, if the residual tooth crown is long, the reduction retainer is designed to be a wrapping member that wraps around the crown of the residual tooth crown; if the residual tooth crown is short, the reduction retainer is designed to be a supporting plate that supports the crown of the residual tooth crown.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] This invention can precisely guide the crown reduction of residual teeth, ensuring accurate reduction angle, direction, and depth. Using the patient's personalized three-dimensional data, the guide plate provides clear positioning and a precise reduction path for the crown reduction of residual teeth, effectively avoiding the limitations of traditional crown reduction of residual teeth that rely on operator experience.

[0035] Based on the patient's oral structure and dental status, the present invention adopts three-dimensional scanning and computer-aided design and manufacturing (CAD / CAM) technology to customize personalized residual tooth crown reduction guide plates. For residual teeth with long crowns and whose crown positions need to be moved significantly, the reduction retainer is designed as a wrapping member, which can cover more of the residual tooth crown surface, provide stronger retention force, and ensure stability during the reduction process; and for residual teeth with short crowns and small crown positions, the reduction retainer is designed as a flat-plate top plate, which provides sufficient fixing space for the reduction of the residual teeth, while also avoiding excessive wrapping that affects the operating field of view.

[0036] This invention uses a digital guide for coronal repositioning of residual teeth to precisely guide the process, effectively reducing operator error and ensuring stability after coronal repositioning. This not only effectively improves the accuracy of coronal repositioning of residual teeth, but also speeds up the process, reducing the multiple adjustments and corrections that may occur during the repositioning process. This effectively shortens the coronal repositioning time and reduces the risk of repositioning. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the structure of the present invention Figure 1 (The resetting retaining part is a top support plate).

[0038] Figure 2 Schematic diagram of the structure of the present invention Figure 2 (The resetting retaining member is a wrapping member).

[0039] Figure 3 This is a schematic diagram of the guide plate of the present invention installed on a simulated dental arch (the repositioning retainer is a top plate).

[0040] Figure 4 This is a schematic diagram of the virtual tooth arrangement of the present invention.

[0041] Figure 5 This is a schematic diagram of the alveolar socket morphology after tooth extraction simulated by the present invention Figure 1 .

[0042] Figure 6 This is a schematic diagram of the alveolar socket morphology after tooth extraction simulated by the present invention Figure 2 .

[0043] Figure 7 This is another schematic diagram of the guide plate of the present invention being installed on a simulated dental arch.

[0044] Figure 8 Schematic diagram of the wrapping member of the present invention.

[0045] The names corresponding to the reference numerals are:

[0046] 1-base plate, 2-connecting part, 3-residual teeth, 4-reduction retaining part, 5-top support plate, 6-wrapping part, 7-observation window, 8-connecting rod, 9-pin, 10-socket, 12-ball. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0048] Example 1.

[0049] like Figures 1-8 As shown, the present invention provides a digital guide for crown-directed reduction of residual teeth in the oral cavity, comprising a base plate 1 for covering and embedding on a dental arch. The base plate 1 is characterized in that a connector 2 is mounted on the base plate 1, and a reduction retainer 4 is provided on the connector 2 for retaining the residual tooth 3 during reduction. An observation window 7 is provided on the base plate 1.

[0050] This invention features a simple structure, scientifically designed, and easy-to-use technology. It precisely guides the crown reduction of residual teeth, ensuring accurate angle, direction, and depth. Utilizing the patient's personalized three-dimensional data, the guide provides clear positioning and a precise reduction path for the crown reduction of the residual tooth, effectively avoiding the limitations of traditional crown reduction techniques that rely solely on operator experience.

[0051] The operator can confirm the position of the guide plate through the observation window 7 to ensure the accuracy of the reset operation.

[0052] Example 2.

[0053] like Figures 1-8 As shown, the present invention provides a digital guide for crown-directed reduction of residual teeth in the oral cavity, comprising a base plate 1 for covering and embedding on a dental arch. The base plate 1 is characterized in that a connector 2 is mounted on the base plate 1, and a reduction retainer 4 is provided on the connector 2 for retaining the residual tooth 3 during reduction. An observation window 7 is provided on the base plate 1.

[0054] When the crown of the remaining tooth is short, the reduction retainer 4 includes a supporting plate 5 provided on the connecting member 2 for supporting the remaining tooth 3. The supporting plate 5 and the connecting member 2 are an integral structure. When the crown of the remaining tooth is long, the reduction retainer 4 includes a wrapping member 6 that adapts to and surrounds the crown of the remaining tooth 3. The wrapping member 6 and the connecting member 2 are an integral structure.

[0055] Based on the patient's oral structure and dental status, the present invention adopts three-dimensional scanning and computer-aided design and manufacturing (CAD / CAM) technology to customize personalized residual tooth crown reduction guide plates. For residual teeth with long crowns and whose crown positions need to be moved significantly, the reduction retainer is designed as a wrapping member, which can cover more of the residual tooth crown surface, provide stronger retention force, and ensure stability during the reduction process; and for residual teeth with short crowns and small crown positions, the reduction retainer is designed as a flat-plate top plate, which provides sufficient fixing space for the reduction of the residual teeth, while also avoiding excessive wrapping that affects the operating field of view.

[0056] Example 3.

[0057] like Figures 1-8 As shown, the present invention provides a digital guide for crown-directed reduction of residual teeth in the oral cavity, comprising a base plate 1 for covering and embedding on a dental arch. The base plate 1 is characterized in that a connector 2 is mounted on the base plate 1, and a reduction retainer 4 is provided on the connector 2 for retaining the residual tooth 3 during reduction. An observation window 7 is provided on the base plate 1.

[0058] The connecting member 2 includes a connecting rod 8, and the reset retaining member 4 is located on the connecting rod 8; a connecting mechanism is provided between the connecting rod 8 and the base plate 1;

[0059] Preferably, the connecting mechanism includes a pin 9 provided on the base plate 1 and a socket 10 provided on the connecting rod 8; the socket 10 is provided with a slot hole adapted to the pin 9, and the pin 9 is plugged into the slot hole;

[0060] Preferably, a ball 12 is provided on the socket 10. The ball 12 can serve as a handle to facilitate the disassembly and assembly between the connecting rod 8 and the base plate 1.

[0061] This invention uses a digital guide for coronal repositioning of residual teeth to precisely guide the process, effectively reducing operator error and ensuring stability after coronal repositioning. This not only effectively improves the accuracy of coronal repositioning of residual teeth, but also speeds up the process, reducing the multiple adjustments and corrections that may occur during the repositioning process. This effectively shortens the coronal repositioning time and reduces the risk of repositioning.

[0062] Example 4.

[0063] A method for preparing a digital guide plate for crown repositioning of residual teeth in an oral cavity comprises the following steps:

[0064] Step 1: Data collection: collecting patient dentition information, image information, and facial information;

[0065] Step 2: Modeling, virtually reconstructing the patient's oral structure;

[0066] Step 3: Guide plate production: Based on the collected data information and virtual oral structure, a digital guide plate is designed and produced.

[0067] The present invention can produce a personalized residual tooth crown reduction digital guide plate that meets the patient's oral status through the above method.

[0068] This invention features a simple structure, scientifically designed, and easy-to-use technology. It precisely guides the crown reduction of residual teeth, ensuring accurate angle, direction, and depth. Utilizing the patient's personalized three-dimensional data, the guide provides clear positioning and a precise reduction path for the crown reduction of the residual tooth, effectively avoiding the limitations of traditional crown reduction techniques that rely solely on operator experience.

[0069] This invention uses a digital guide for coronal repositioning of residual teeth to precisely guide the process, effectively reducing operator error and ensuring stability after coronal repositioning. This not only effectively improves the accuracy of coronal repositioning of residual teeth, but also speeds up the process, reducing the multiple adjustments and corrections that may occur during the repositioning process. This effectively shortens the coronal repositioning time and reduces the risk of repositioning.

[0070] Example 5.

[0071] A method for preparing a digital guide plate for crown repositioning of residual teeth in an oral cavity comprises the following steps:

[0072] Step 1: Data information collection, collect patient dentition information, image information and facial information.

[0073] The present invention obtains the patient's dentition data through digital oral scanning or impression, and the dentition data includes the number, arrangement, shape and occlusal relationship of the teeth.

[0074] The present invention obtains the patient's oral cavity, teeth, and maxillofacial imaging information through three-dimensional imaging technology. The imaging information can show the length, angle and residual root shape of the tooth root.

[0075] The present invention collects facial data of patients through three-dimensional facial scanning or digital photography, and the facial data includes facial morphology, occlusal position, and lip morphology.

[0076] Step 2: Modeling and virtually reconstructing the patient's oral structure.

[0077] The modeling process involves the following steps:

[0078] Step (1): Virtual tooth arrangement.

[0079] When virtually arranging teeth, the tooth positions that meet the patient's functional and aesthetic needs are simulated based on the patient's dentition information and the natural morphology, occlusion relationship and facial features.

[0080] Step (2): virtual alveolar socket morphology after tooth extraction.

[0081] When simulating the alveolar socket morphology after tooth extraction, the software is used to simulate the alveolar socket morphology after tooth extraction. According to the length, angle and status of the residual tooth root and the alveolar socket, the operation path required for reduction is virtualized and the ideal position of the tooth after reduction is simulated.

[0082] Step (3): Evaluation and optimization of virtual reduction of the residual crown.

[0083] When evaluating and optimizing the virtual reduction of the residual crown, a computer is used to simulate the reduction process. The angle, direction, and depth required for the reduction of the residual tooth are simulated according to the residual root morphology. The stability, occlusal function, and aesthetic effect of the residual tooth after reduction are then pre-evaluated to see whether the restoration conditions can be met.

[0084] Step (4): Evaluation of virtual restoration effects.

[0085] When evaluating the virtual restoration effect, the software simulates the shape of the remaining teeth after reduction, and evaluates the structure and durability of the remaining teeth after reduction.

[0086] Step 3: Guide plate production: Based on the collected data information and virtual oral structure, a digital guide plate is designed and produced.

[0087] When making the guide, a 3D model of the digital guide for the residual crown reduction is designed based on the collected data and the virtual oral structure. The 3D model of the digital guide for the residual crown reduction is input into a 3D printer to print out the digital guide for the residual crown reduction. When designing the 3D model of the digital guide for the residual crown reduction, if the residual crown is long, the reduction retainer is designed to be a wrapping piece that wraps around the crown of the residual crown. If the residual crown is short, the reduction retainer is designed to be a supporting plate that supports the crown of the residual crown.

[0088] This invention features a simple structure, scientifically designed, and easy-to-use technology. It precisely guides the crown reduction of residual teeth, ensuring accurate angle, direction, and depth. Utilizing the patient's personalized three-dimensional data, the guide provides clear positioning and a precise reduction path for the crown reduction of the residual tooth, effectively avoiding the limitations of traditional crown reduction techniques that rely solely on operator experience.

[0089] The present invention preferably uses professional software such as EXO CAD, 3Shape, Mimics, etc. for modeling.

[0090] In step (1) of the present invention, when virtually arranging teeth, the patient's dentition information and the natural morphology, occlusion, and facial features are used to simulate the tooth positions that meet the patient's functional and aesthetic needs. The functional needs of the present invention mainly refer to the patient's dental function during daily activities such as chewing and speaking. Specifically, they include:

[0091] (1) Occlusal stability: The arrangement of teeth should ensure the stability of the patient's occlusion, avoid biased jaw or incorrect occlusion, and ensure that the upper and lower teeth can contact correctly during chewing.

[0092] (2) Chewing efficiency: The position of teeth should facilitate normal chewing function, ensure that food can be chewed evenly, and avoid unnecessary tooth wear or discomfort.

[0093] (3) Temporomandibular joint health: The position of the teeth should avoid excessive pressure or displacement on the temporomandibular joint, preventing problems such as temporomandibular joint disorder (TMJ).

[0094] The aesthetic needs mentioned in this article refer to the appearance that patients hope to achieve through tooth restoration. Specifically, they include:

[0095] (1) Tooth morphology and natural beauty: The shape, size, and proportion of the teeth should be coordinated with the patient's facial features (such as lip shape, facial width, etc.) and other teeth to ensure naturalness and beauty. In particular, the appearance of the front teeth should conform to facial aesthetics.

[0096] (2) Color and transparency: The color of the teeth needs to match the patient's skin tone, lip color, and natural tooth color to avoid the teeth appearing unnatural. Adjusting the transparency is also critical, especially for the front teeth, which need to simulate the optical effect of natural teeth.

[0097] (3) Smile line and aesthetic curve: The patient's smile line (the line where the upper lip meets the teeth when smiling) matches the tooth arrangement. The aesthetic curve refers to the curve of the upper and lower teeth from different viewing angles, ideally presenting a natural, soft curve.

[0098] (4) Symmetry and balance: The arrangement of teeth should take into account the symmetry and balance of the face. For example, the shape and position of the teeth on the left and right sides should be as similar as possible to ensure symmetry when smiling and biting.

[0099] In the step (three) of the present invention, when evaluating and optimizing the virtual reduction of the residual crown, a computer is used to simulate the reduction process, and the angle, direction and depth required for the reduction of the residual tooth are virtualized according to the residual root morphology, and a preliminary evaluation is made as to whether the restoration conditions can be met based on the stability, occlusal function and aesthetic effect of the residual tooth after reduction.

[0100] When performing a stability pre-assessment in the present invention, the tooth root should be deeply buried in the alveolar bone to maintain adequate bone support. The tooth root should not be exposed too much after reduction to avoid damage to the alveolar bone. The depth and stability of the tooth root are key factors in determining whether the tooth can be stable in the long term after reduction. Confirm that the portion of the tooth root located in the bone exceeds 3-4mm, and the contact surface between the tooth root and the alveolar bone should ensure the maximum contact area to enhance the stability and support of the tooth root.

[0101] The present invention includes the following two aspects when conducting preliminary evaluation of occlusal function:

[0102] (1) Crown-root ratio: The ideal crown-root ratio is usually 1:2 or 1:1.5. At this ratio, the tooth root can provide sufficient support to ensure the stability and long-term prognosis of the tooth after reduction. If the crown-root ratio is too large or too small, auxiliary measures such as piling may be needed to improve the stability of the tooth. During the virtual evaluation and optimization process, a reasonable crown-root ratio should be combined with factors such as tooth position, occlusal function and aesthetic effect to ensure the best restoration effect.

[0103] (2) Dentin shoulder collar: The depth of the shoulder collar should be located at the junction of dentin and enamel. Usually, it should avoid being too deep at the boundary between enamel and dentin to ensure a smooth transition between the restoration and the natural tooth and reduce the risk of edge wear or leakage. Ensure that at least 1.5mm of dentin shoulder collar can be obtained after repositioning.

[0104] The present invention includes the following two aspects when conducting preliminary evaluation of aesthetic effects:

[0105] (1) Arch contour: The ideal position of the crown should be coordinated with the patient's arch contour. The labio-cheek position of the restoration determines the amount of tooth exposure, affecting the width of the smile and the symmetry of the teeth. Excessive labial inclination in the anterior area will make the teeth appear protruding, while lingual inclination may lead to a "collapsed" face. The position of the restoration affects the lip support. Improper positioning of the restoration in the maxillary anterior area (such as excessive inward retraction) may cause lip collapse and an aged appearance; excessive labial inclination of the mandibular anterior teeth may destroy the natural curvature of the chin-labial groove.

[0106] (2) Lip and tooth aesthetics: The position of the restoration should be aligned with facial reference lines such as the facial midline and pupil line. The ratio of anterior tooth width (central incisor: lateral incisor: canine ≈ 1.618:1:0.618) can improve visual harmony. The height of the restoration should be coordinated with the dynamic lip shape during speaking and smiling to avoid insufficient or excessive dynamic exposure caused by static design.

[0107] In the step (four) of the present invention, when evaluating the virtual restoration effect, the shape of the residual tooth after reduction is simulated by software, and the structure and durability of the residual tooth after reduction are evaluated.

[0108] The structure after reduction of the present invention is as follows: it is confirmed that the portion of the tooth root located in the bone exceeds 3-4 mm, the coronal side of the reduced tooth crown is located on the gingival margin, and there is sufficient tooth tissue to be used for preparing the dentin collar.

[0109] The durability described in the present invention is as follows: confirm that the bone powder filling is sufficient, the tooth root can be stable in the cavity, and there is sufficient tooth tissue above the gingival margin to be fixed with a periodontal splint to stabilize the current reduction position, so as to help obtain the ideal repair effect in the later stage.

[0110] Based on the patient's oral structure and dental status, the present invention adopts three-dimensional scanning and computer-aided design and manufacturing (CAD / CAM) technology to customize personalized residual tooth crown reduction guide plates. For residual teeth with long crowns and whose crown positions need to be moved significantly, the reduction retainer is designed as a wrapping member, which can cover more of the residual tooth crown surface, provide stronger retention force, and ensure stability during the reduction process; and for residual teeth with short crowns and small crown positions, the reduction retainer is designed as a flat-plate top plate, which provides sufficient fixing space for the reduction of the residual teeth, while also avoiding excessive wrapping that affects the operating field of view.

[0111] This invention uses a digital guide for coronal repositioning of residual teeth to precisely guide the process, effectively reducing operator error and ensuring stability after coronal repositioning. This not only effectively improves the accuracy of coronal repositioning of residual teeth, but also speeds up the process, reducing the multiple adjustments and corrections that may occur during the repositioning process. This effectively shortens the coronal repositioning time and reduces the risk of repositioning.

[0112] The digital guide for crown-directed reduction of residual teeth in the oral cavity of the present invention can accurately guide the crown-directed reduction of residual teeth and provide personalized and precise reduction guidance. It can effectively improve the accuracy, stability and predictability of reduction, effectively reduce the risk of crown-directed reduction of residual teeth, and optimize the restoration effect of crown-directed reduction of residual teeth.

[0113] The preparation of the digital guide plate for the crown repositioning of residual teeth in the oral cavity of the present invention comprises the following steps:

[0114] 1. Data collection. Comprehensive oral information collection is conducted on the patient to ensure that all operations during the reduction of the residual crown are supported by data. The information collected includes but is not limited to:

[0115] Denture information: The patient's dentition data is obtained through digital oral scanning or impression technology. This data includes the number, arrangement, morphology, occlusion, etc. of teeth, providing basic data for subsequent restoration design.

[0116] Imaging Information: Detailed imaging of the patient's oral cavity, teeth, and maxillofacial area is obtained through 3D imaging techniques (such as CT scans and CBCT scans). This imaging data not only accurately displays the position and morphology of teeth, but also reveals the length, angle, and residual root status of the teeth, providing precise spatial information for designing an ideal repositioning plan.

[0117] Facial information: The patient's facial data, including facial morphology, bite position, lip shape, etc., is collected through 3D facial scanning or digital photography to ensure that the appearance of the teeth after repositioning is consistent with the face and to avoid over-repair or asymmetry.

[0118] 2. Modeling. After obtaining detailed patient information, the present invention uses professional 3D modeling and computer-aided design (CAD) software to virtually reconstruct the patient's oral structure for subsequent repositioning and restoration design. The specific steps include:

[0119] Virtual Tooth Arrangement: Based on the patient's dentition information, a virtual tooth arrangement is designed to ensure that each tooth is arranged in the ideal position. This process considers the natural morphology of the dentition, occlusion, and facial features to design tooth positions that meet the patient's functional and aesthetic needs.

[0120] Simulate the alveolar socket morphology after tooth extraction: The software simulates the alveolar socket morphology after tooth extraction and predicts the socket reconstruction process. Based on the length and angle of the residual tooth root and the state of the alveolar socket, the operation path required for repositioning is designed to simulate the ideal position of the tooth after repositioning.

[0121] Evaluation and optimization of coronal reduction: Based on the residual condition of the tooth, the angle, direction, and depth required for reduction are evaluated. Computer simulation of the reduction process is used to pre-evaluate whether the restoration conditions can be met, including stability, occlusal function, and aesthetic effect after tooth reduction.

[0122] Restoration Evaluation: The software simulates the tooth's post-repositioning appearance to ensure that the designed restoration plan can smoothly transition to the restoration phase and meet the patient's physiological and aesthetic needs. The software can also assess whether there are any structural issues with the tooth restoration and whether it can meet the durability requirements for long-term use.

[0123] 3. Guide design. Based on the results of virtual tooth arrangement and coronal reduction simulation, this invention uses digital guide technology to design a personalized surgical guide to ensure accurate coronal reduction. The guide design takes into account individual patient differences, the morphology of the remaining teeth, and the reduction requirements, and mainly includes the following:

[0124] Guide design principles: Guide design is based on the patient's individual reduction needs to ensure accurate reduction. Through precise digital design, the guide precisely positions each step of the reduction process, eliminating manual errors.

[0125] Reduction accessory design: The reduction retainer on the guide plate is customized according to the shape of the patient's remaining teeth. For patients with long residual crowns that require significant crown movement, the reduction retainer is designed to wrap around the crown. This covers more of the crown surface, provides stronger retention, and ensures stability during the reduction process. For patients with short residual crowns and smaller crowns, the reduction retainer can be designed as a flat top plate to provide sufficient fixed space for tooth reduction while avoiding excessive wrapping that affects the operating field.

[0126] Guide Plate Support Design: The guide plate utilizes a tooth-supported design, stabilizing its position and ensuring it does not shift during reduction. The guide plate's latch (connection mechanism) is located on the occlusal surface to avoid obstructing the operator's field of view and minimizing interference with the surgeon's field of view during surgery. The guide plate also features an observation window, allowing the operator to confirm the guide plate's position and ensure accurate operation.

[0127] Precise Guidance and Repositioning: The guide design precisely guides the operator through the coronal repositioning operation. Precise control of angle, direction, and depth ensures that the repositioned tooth fits well with the surrounding structure, avoiding subsequent restoration problems caused by repositioning errors.

[0128] 4. Guide plate production: Based on the collected data information and virtual oral structure, a three-dimensional model of the digital guide plate for residual crown reduction is designed, and the three-dimensional model of the digital guide plate for residual crown reduction is input into the 3D printer to print out the digital guide plate for residual crown reduction.

[0129] The connection structure of the pin 9 and the socket 10 used in the present invention is the existing technology. Preferably, the socket 3 and the ring slot D2001 in the patent publication number CN118161312A and the patent name "A Digital Guide Plate for Biologically Guided Bone Augmentation Technology" are used. The pin 9 structure in the present invention corresponds to the socket 3 in the above-mentioned patent technology, and the socket 10 structure in the present invention corresponds to the ring slot D2001 in the above-mentioned patent technology.

[0130] Finally, it should be noted that the above embodiments are merely preferred embodiments of the present invention and are intended to illustrate the technical solutions of the present invention, not to limit the present invention, and certainly not to limit the scope of the present invention. Any modifications or improvements that are insubstantial to the main design concept and spirit of the present invention, provided that the technical problems they solve are consistent with the present invention, shall be included within the scope of protection of the present invention. Furthermore, any direct or indirect application of the technical solutions of the present invention to other related technical fields shall also be included within the scope of protection of the present invention.

Claims

1. A digital guide plate for crown repositioning of residual teeth in the oral cavity, comprising a base plate (1) for covering and embedding on a dental arch, characterized in that: A connecting piece (2) is installed on the base plate (1), and a resetting retaining piece (4) for retaining the remaining tooth (3) during resetting is provided on the connecting piece (2).

2. The digital guide for crown repositioning of residual teeth in the oral cavity according to claim 1, characterized in that: The resetting retaining member (4) comprises a supporting plate (5) provided on the connecting member (2) and used for supporting the remaining teeth (3).

3. The digital guide for crown repositioning of residual teeth in the oral cavity according to claim 1, characterized in that: The resetting retaining member (4) comprises a wrapping member (6) adapted to the crown of the root of the residual tooth (3) and wrapping around the crown of the residual tooth (3).

4. The digital guide for crown repositioning of residual teeth in the oral cavity according to claim 1, characterized in that: The connecting member (2) includes a connecting rod (8), and the reset retaining member (4) is located on the connecting rod (8); a connecting mechanism is provided between the connecting rod (8) and the base plate (1); The connecting mechanism comprises a plug (9) arranged on a base plate (1) and a socket (10) arranged on a connecting rod (8); a slot hole adapted to the plug (9) is provided on the socket (10), and the plug (9) is plugged into the slot hole; and a ball (12) is provided on the socket (10).

5. A method for preparing a digital guide for crown repositioning of residual teeth in the oral cavity according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Data collection: collecting patient dentition information, image information, and facial information; Step 2: Modeling, virtually reconstructing the patient's oral structure; Step 3: Guide plate production: Based on the collected data information and virtual oral structure, a digital guide plate is designed and produced.

6. The preparation method according to claim 5, characterized in that In the step 1, the patient's dentition data is obtained by digital oral scanning or impression, and the dentition data includes the number, arrangement, shape and occlusal relationship of the teeth; In step 1, three-dimensional imaging technology is used to obtain oral, dental, and maxillofacial imaging information of the patient, and the imaging information can show the length, angle, and residual root morphology of the tooth root; In the step 1, the patient's facial data is collected through three-dimensional facial scanning or digital photography, and the facial data includes facial shape, bite position, and lip shape.

7. The preparation method according to claim 5, characterized in that In the second step, when modeling, the following steps are included: Step (1), virtual tooth arrangement; Step (2), virtual alveolar socket morphology after tooth extraction; Step (3): virtual reduction evaluation and optimization of the residual crown; Step (4): Evaluation of virtual restoration effects.

8. The preparation method according to claim 7, characterized in that In step (1), when virtually arranging teeth, the tooth positions that meet the patient's functional and aesthetic needs are virtually created based on the patient's dentition information and the natural morphology, occlusal relationship, and facial features of the dentition; In step (2), when simulating the alveolar socket morphology after tooth extraction, the alveolar socket morphology after tooth extraction is simulated by software, and the operation path required for reduction is virtualized and the ideal position of the teeth after reduction is simulated according to the length, angle and state of the residual tooth root.

9. The preparation method according to claim 7, characterized in that In step (3), when evaluating and optimizing the virtual reduction of the residual crown, a computer is used to simulate the reduction process, and the angle, direction and depth required for the reduction of the residual tooth are simulated according to the residual root morphology. The stability, occlusal function and aesthetic effect of the residual tooth after reduction are pre-evaluated to determine whether the restoration conditions can be met. In the step (four), when evaluating the virtual restoration effect, the shape of the remaining tooth after reduction is simulated by software, and the structure and durability of the remaining tooth after reduction are evaluated.

10. The preparation method according to claim 5, characterized in that In step 3, when making the guide plate, a three-dimensional model of the digital guide plate for residual crown reduction is designed based on the collected data information and the virtual oral structure, and the three-dimensional model of the digital guide plate for residual crown reduction is input into a 3D printer to print the digital guide plate for residual crown reduction; When designing a three-dimensional model of a digital guide for reduction of the residual crown, if the residual crown is long, the reduction retainer is designed to be a wrapping piece that wraps around the crown of the residual crown; if the residual crown is short, the reduction retainer is designed to be a supporting plate that supports the crown of the residual crown.

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