550 results about "Tooth root" patented technology

The embodiment of the invention discloses a root canal feature form extraction method, device and equipment based on CBCT data and a medium, and belongs to the technical field of stomatology and medical image.The method comprises the steps that filtering denoising and dental pulp segmentation processing are carried out on a CBCT image, and surface drawing three-dimensional reconstruction is carried out on a tooth root canal to generate a three-dimensional model; based on regular point cloud data in the three-dimensional model, adopting a point-surface method to realize curved surface reconstruction, and generating a root canal entity model; and performing coordinate alignment processing on the root canal solid model in a three-dimensional space, and measuring the length of the root canal, the direction of a root canal orifice, the curvature of the root canal and the depth of dental pulp by fitting the approximate center line of the root canal. According to the method, the corresponding three-dimensional model is quickly reconstructed based on the CBCT cross-sectional image obtained by scanning the teeth of the patient, and related data such as the dental pulp depth and the size of the root canal orifice are acquired from the three-dimensional model of the teeth so as to assist the oral surgery.

The invention discloses an impacted wisdom tooth extraction resistance analysis simulation method and system based on CBCT and AI segmentation, is suitable for scenes of extraction resistance intelligent analysis and preoperative path simulation of impacted wisdom teeth, and assesses risks by automatically measuring the minimum spatial distance between the tooth root tip of a wisdom tooth to be extracted and a dental nerve tube. A resistance removal strategy is selected by performing three-dimensional mechanical analysis on adjacent tooth resistance, bone resistance and tooth root resistance of a wisdom tooth to be extracted, and a wisdom tooth extraction simulation path is planned based on a risk assessment result and the resistance removal strategy. According to the method, complex impacted wisdom teeth are analyzed for the first time, risk assessment and three-dimensional mechanical analysis related to an operation are achieved, and special modeling, risk assessment and tooth extraction resistance analysis can be conducted on the impacted wisdom teeth, especially the impacted mandibular wisdom teeth which are high-risk conditions that the shapes of adjacent neural tubes and tooth roots are complex and resistance sources are diversified; the pull-out difficulty, the resistance source and the intraoperative risk point are reflected, and the clinical use requirements are met.

The invention discloses a mutual inductor iron core, a mutual inductor coil and a current transformer, and belongs to the technical field of current transformers, the mutual inductor iron core comprises a protective shell, a core body and a limiting assembly, the protective shell is provided with an annular first containing cavity, and the core body is located in the first containing cavity; the inner top wall and the inner bottom wall of the first containing cavity are each provided with a plurality of first triangular teeth which are evenly distributed in the circumferential direction in a protruding mode, the limiting assembly comprises an elastic structure and two annular limiting plates, the two limiting plates are located on the two axial sides of the core body correspondingly, and the surfaces of the limiting plates are each provided with a plurality of second triangular teeth which are evenly distributed in the circumferential direction in a protruding mode; the inclined face of the second triangular tooth is attached to the inclined face of the first triangular tooth, the elastic force of the elastic structure is used for forcing the two limiting plates to rotate relative to the protective shell in the circumferential direction, and the inclined face of the second triangular tooth is partially attached to the inclined face of the first triangular tooth, so that an axial gap is formed between the tooth crest of the second triangular tooth and the tooth root of the first triangular tooth. The structural stability and the position stability of the core body can be improved.

The invention belongs to the field of data processing, particularly relates to a wind turbine generator gear box tooth surface strength optimization method considering multi-working-condition load distribution, and aims to solve the problem that the optimization effect is affected due to the fact that strength optimization checking is carried out only for a single working condition in the prior art. The method comprises the following steps: acquiring working condition data of the gearbox under various preset working conditions; load spectrum decoupling processing is conducted on the working condition data, a dynamic load distribution matrix synchronous with the tooth surface meshing period is determined, stress field conversion is conducted on the dynamic load distribution matrix, and a tooth root bending stress field and a tooth surface contact stress field are obtained; inputting the tooth root bending stress field and the tooth surface contact stress field into a pre-constructed double-constraint optimization model to obtain a tooth surface strengthening parameter tensor output by the model; and inputting the tooth surface strengthening parameter tensor into a preset process mapping system. Based on the method provided by the invention, the multi-working-condition operation data of the gearbox are synchronously obtained for optimization calculation, and the limitation of traditional single load analysis is broken through.

The invention relates to an alveolar bone surface tooth root detection method and detector, and the method comprises the following steps: obtaining age data and bone density data of a testee according to CT data and imaging data of the testee, and matching corresponding ultrasonic parameters and acoustic impedance correction parameters; constructing a multi-layer medium acoustic impedance model comprising a tooth root layer of the bone surface of the alveolar bone; configuring transmitted ultrasonic waves based on the ultrasonic wave parameters; receiving an echo signal corresponding to the transmitted ultrasonic wave, and performing adaptive correction on parameters of each layer in the multilayer medium acoustic impedance model based on the acoustic impedance correction parameters by taking minimization of the difference between the echo signal and a theoretical reflection signal obtained by the multilayer medium acoustic impedance model as a target; and based on the multi-layer medium acoustic impedance model after self-adaptive correction, realizing detection of the tooth root on the bone surface of the alveolar bone. Compared with the prior art, the method has the advantages of accurate detection of the tooth root on the bone surface of the alveolar bone, high adaptability and the like.

The embodiment of the invention discloses a method for measuring a buccal-lingual torque value of maxillary molar based on improved ResNET. The method comprises the following steps: acquiring and preprocessing three-dimensional images of teeth and alveolar bones, and performing three-dimensional reconstruction on the preprocessed images; based on the coupling relationship between the dental crown and the tooth root, positioning a first tooth long axis; positioning a second tooth long axis based on the coupling relationship between the tooth and the alveolar bone; calculating an included angle between the first tooth long axis and the second tooth long axis and generating a new long axis; calculating and verifying a buccal-lingual torque value of the maxillary molar; through the automatic process, the accurate measurement and calculation of the upper jaw first molar torque value are realized, and the effectiveness and accuracy are improved.

The invention provides a trapezoidal thread parameter measurement method and system based on machine vision. The method comprises the following steps: acquiring a thread image and extracting thread contour features; based on the extracted thread contour features, carrying out tooth crest, tooth bottom and two-side thread profile contour segmentation; performing straight line fitting on the tooth crest contour and the tooth bottom contour of each tooth form to obtain a straight line point set of each tooth crest, then fitting the tooth crest straight line point set in the visible range to obtain a tooth crest straight line, and obtaining a tooth bottom straight line by adopting the same method as the tooth crest; and finally, based on the straight lines of the tooth crests and the tooth bottoms of the threads on the two sides of the to-be-measured rod piece, calculating the central axis of the threads, the tooth crest distance and the tooth bottom distance of the threads on the two sides of the to-be-measured rod piece, the tooth height and the tooth width. The trapezoidal thread tooth crest and the trapezoidal thread tooth bottom are segmented by fusing a graphics method, thread parameter measurement is divided into small-size parameter measurement and large-size parameter measurement, the thread measurement precision is improved while the thread measurement difficulty is simplified, and the adaptability of a visual scheme in trapezoidal thread measurement is enhanced.

The invention belongs to the technical field of gear machining, and discloses a gear milling blade and a disc-shaped milling cutter. The tooth milling blade comprises a side edge, a top edge and an auxiliary edge, wherein the top edge is arranged between the side edge and the auxiliary edge; the outer contour line of the top edge protrudes towards the workpiece to be machined, the outer contour line of the top edge comprises a top edge arc line and an oval arc line, one end of the top edge arc line is connected with the outer contour line of the side edge, and the other end of the top edge arc line is an end point E; one end of the elliptic arc line is connected with the end point E and is tangent to the end point E, and the other end of the elliptic arc line is connected with the outer contour line of the auxiliary blade. The tooth milling blade is provided with an elliptical profile curve, so that the curvature distribution on a tooth root transition curve can be effectively improved, the curvature radius of the tooth root transition curve is increased and the tooth root stress is reduced when a tooth groove is cut, and thus the tooth root strength of an involute gear is improved; and meanwhile, the elliptic arc line and the top edge arc line are connected and tangent at the end point E, so that the outer contour line of the top edge is ensured to be smooth.

The invention relates to three-dimensional models for simulating medical, in particular dental, treatments and methods for producing such a three-dimensional model, the three-dimensional model comprising at least one holding element for receiving artificial teeth and at least one artificial tooth, wherein the artificial tooth comprises at least one artificial tooth root, wherein the artificial tooth root is at least partly received in a recess of the holding element, and wherein a plurality of connecting strands is formed between the holding element and the artificial tooth, in particular the artificial tooth root.

The utility model relates to the field of machining tools, and discloses a machining tool for an external spline with side teeth, which comprises an external spline hobbing cutter and an external spline side tooth milling cutter, a plurality of groups of hobbing cutter teeth are arranged on the external spline hobbing cutter along the axial direction, a root digging structure is arranged at the tooth top of each hobbing cutter tooth, and a chamfer is arranged at the tooth root of each hobbing cutter tooth; the external spline side tooth milling cutter comprises a milling cutter rod, a milling cutter blade is installed at the end of the milling cutter rod, an involute-shaped cutting edge is arranged on the milling cutter blade, and a plurality of involute cutting edge teeth are arranged on the cutting edge side by side. The external spline driving shaft capable of machining the spline with the side teeth solves the problem that in the prior art, a cutter capable of machining the external spline of the spline driving shaft in the design does not exist, and the machining requirement of the external spline with the side teeth cannot be met.

The invention relates to the technical field of digital medical treatment, and discloses a dental three-dimensional identification and model generation method based on CBCT and deep learning, and the method comprises the steps: carrying out the preprocessing of obtained CBCT image data; the preprocessed CBCT image data is segmented, and the segmentation step comprises the substeps that a tooth three-dimensional model, an alveolar bone three-dimensional model and a mandibular neural tube three-dimensional model are obtained by adopting a two-stage cascade deep learning network; based on the tooth three-dimensional model and the alveolar bone three-dimensional model, obtaining a periodontal membrane three-dimensional model through geometric and Boolean operation; a tooth root area in the tooth three-dimensional model is positioned, and a self-adaptive threshold method is adopted for CBCT image data corresponding to the tooth root area, and a root canal three-dimensional model is recognized and generated; based on at least one of the obtained three-dimensional models, a personalized clinical application model is generated, high-precision automatic segmentation of the dental complex anatomical structure is achieved, and a reliable digital model basis is provided for personalized precision medical treatment.

The utility model discloses an ultrasonic wearing device for tooth orthodontics, which comprises a U-shaped seat and a plurality of supports arranged on the U-shaped seat, each support is of a U-shaped structure, a corresponding ultrasonic transducer is arranged on each support, the plurality of ultrasonic transducers correspond to the corrected teeth of a patient in number and position, and the plurality of ultrasonic transducers are arranged on the U-shaped seat. The ultrasonic transducer is used for performing ultrasonic stimulation on the tooth root. According to the utility model, the arrangement direction of the conductor on the bracket is matched with the opening direction of the sliding groove, the bracket is inserted into the sliding groove through the conductor, and then the bracket is rotated by 90 degrees, so that the two ends of the conductor are inserted into the conduction end, a damping effect on the conductor is achieved, and the bracket is more convenient to disassemble and assemble; the support can be mounted or dismounted only by rotating the support by 90 degrees to enable the extending direction of the conductor to correspond to the forming direction of the sliding groove, and due to the fact that the ultrasonic transducer is arranged on the support, replacement of the ultrasonic transducer in the later period is more convenient.

The utility model provides a curettage tool for apical surgery, which comprises a handle, a neck part and a curettage head, the handle is connected with the curettage head through the neck part, the neck part is bent by 80-100 degrees, the curettage head is shovel-shaped, and one end of the curettage head far away from the neck part is provided with a tip. Through the shovel-shaped design of the digging spoon head, the digging spoon can extend into the position where tooth roots are difficult to scrape, and the problem that the included angle between the root tip lesion lingual side and the tooth surface is an acute angle and is difficult to scrape thoroughly is solved. By means of the specially designed angle, diseased tissues right behind and behind the tooth root can be scraped more effectively, residues of granulation tissues can be reduced, the healing speed of root apex bone defects is increased, and the operation efficiency is improved.

The invention discloses a method for calculating the strength of an end face tooth coupling of an energy storage centrifugal compressor, relates to a method for calculating the strength of an end face tooth coupling, and aims to solve the problem that a method for accurately judging whether the strength of the end face tooth coupling of the compressor is qualified or not by a conventional end face tooth calculation and checking method does not exist at present. The method is implemented according to the following steps that firstly, axial component force generated when the end face teeth transmit torque is obtained; 2, the axial expansion difference of the end face teeth, the main shaft and the screw at the working temperature is calculated, and the actual pre-tightening force of the screw during unit operation is calculated; 3, impeller thrust generated by the front and back pressure difference of the impeller is calculated, the effective tooth surface area of the end face teeth is calculated, and the end face tooth root bending stress, the end face tooth maximum extrusion stress and the end face tooth axial tensioning force safety coefficient of the centrifugal compressor are calculated; and 4, judging the strength of the end face tooth coupling of the energy storage centrifugal compressor. The invention belongs to the field of end face tooth coupling checking.

The invention relates to the technical field of tooth root angle measurement, and provides a tooth root angle three-dimensional intelligent measurement method based on an oral cavity CBCT image, and the method comprises the steps: constructing a Teeth-MambaSeg tooth segmentation neural network model for carrying out tooth segmentation on a to-be-measured oral cavity CBCT image; a training database is constructed, and the Teeth-MambaSeg tooth segmentation neural network model is trained; performing tooth segmentation on a to-be-measured oral cavity CBCT image through the trained Teeth-MambaSeg tooth segmentation neural network model, and projecting a single segmented tooth to a simulated two-dimensional projection plane to obtain a tooth simulated projection image; according to the tooth simulation projection image, feature points related to tooth root angle calculation are extracted, and three-dimensional space coordinates of the feature points are obtained; and obtaining a tooth root angle three-dimensional measurement value according to the three-dimensional space coordinates of the feature points. According to the invention, personal errors of measurement point positioning can be effectively reduced, and the stability and accuracy of tooth root angle measurement are improved.

The invention discloses a detection method and device of a tooth root stress test system and a medium, the tooth root stress test system comprises a plurality of tooth root stress detection units, the tooth root stress detection units are attached to the surface of a tooth root, each tooth root stress detection unit comprises a plurality of strain gauges, and each strain gauge comprises a positive terminal and a negative terminal; in the same tooth root stress detection unit, the strain gauges are connected in series; the detection method of the tooth root stress test system comprises the following steps: acquiring a current total resistance value of the tooth root stress detection unit and a theoretical total resistance value after the strain gauges are connected in series; judging whether the difference value between the current total resistance value and the theoretical total resistance value is within a first difference value preset range or not; and if yes, determining that each strain gauge in the tooth root stress detection unit is normally insulated.

The invention discloses a climbing robot lifting force control method based on finite element simulation, and relates to the technical field of engineering machinery data processing. Comprising the following steps of: establishing a finite element simulation model of the climbing robot to obtain geometrical characteristics including tooth number, pressure angle, tooth root curvature radius, tooth root height and tooth width of an uplink transmission gear and material characteristics including elastic modulus and Poisson's ratio; and simulating gear operation in an on-load state, acquiring torque data to determine a modulus, and calculating tooth root stress. And correcting the tooth root stress in combination with vibration characteristics and surface temperature to obtain an accurate value. The roughness is calculated through the surface height difference, the friction coefficient is corrected by combining the environment humidity and the inclination angle, and the friction force is calculated. And finally, according to the friction force, the accurate tooth root stress and the gravity, a real-time lifting force control coefficient is calculated, the lifting force is dynamically corrected, and accurate control over the lifting force of the climbing robot is achieved.

The invention discloses a tooth instance segmentation method and device based on anatomic form priori, and belongs to the field of computer vision and artificial intelligence. According to the method, model training is carried out on a CBCT image, a real segmentation mask is processed into a three-classification segmentation mask with enamel as a boundary, the three-classification segmentation mask serves as a supervision signal, a network can directly output a prediction segmentation mask containing tooth boundary information in a reasoning stage, and a detection frame is generated accordingly. And after the detection frame is scaled according to the same proportionality coefficient and projected back to the original image, cutting each tooth to obtain a CBCT image of the single tooth. A loss function based on anatomical morphological prior is introduced into segmentation training of a single tooth CBCT image, and a network is constrained through a self-adaptively extracted morphological skeleton, so that a prediction segmentation mask is kept continuous at a root tip part, and the problem of tooth root segmentation fracture is effectively relieved. According to the method, accurate positioning and high-quality segmentation of the tooth instances are realized, so that the segmentation of the tooth instances in the full-mouth CBCT image is quicker and more accurate.

The invention relates to the field of oral medical equipment, and particularly provides an oral implant repair opening degree measuring device and a using method, the oral implant repair opening degree measuring device comprises two positioning supports, the two positioning supports are detachably connected with an angle measuring scale, and the ends of the two positioning supports are connected through a rear tooth area measuring scale; a fixing assembly and a first sliding rail are arranged in the positioning support, the fixing assembly is used for fixing the positioning support and the teeth, and the sliding rail is slidably connected with the tooth root fossa measuring mechanism. The positioning support is made of memory alloy, adaptability is high, the positioning support can be stabilized on teeth of the upper jaw and the lower jaw in the measuring process through fixing of the fixing assembly, and then measuring precision is improved. The angle measuring scale is connected to the anterior parts of upper and lower jaw anterior teeth of a patient and is used for measuring an opening angle; the posterior tooth area measuring scale is connected with the upper positioning support and the lower positioning support so as to measure the opening degree of the posterior tooth area. The tooth root socket measuring mechanism is used for measuring the depth and width of the tooth root socket exposed after tooth extraction of the patient. On the premise of meeting the requirement of opening degree measurement, a relatively accurate tooth root socket measurement function is provided.

Drilling an infected tooth root canal can leave some infected material behind. Heat delivered from within the tooth can be used to disrupt biofilm, disinfect, and / or seal. A cone-shaped flexible device can be inserted into or toward the root canal. The device can include a heating transducer, such as a DC resistive heating element, or an RF heating transducer that can generate heat in a dielectric or semiconductor or polymer active substrate, with a locus of the heat generation controllable by adjusting a frequency of an electrical input signal driving the heating transducer. Thermally conductive fluid can be introduced into the root canal to help distribute heat from the heating transducer to nearby portions of the root canal for heat disinfecting treatment of infected tissue. The active substrate can be heat-softenable, such as to help seal a target region of the tooth.

The invention discloses a tooth root rolling and finishing composite strengthening process method, which mainly considers that a gear is easy to generate tooth root bending fatigue failure under heavy load, obtains a modified tooth root through tooth root micro modification, and then adopts ultrasonic rolling to carry out tooth root local strengthening on the gear tooth root so as to improve the residual stress of the tooth root. And then the gear surface roughness after barreling and finishing is calculated according to the radius of the finishing abrasive particles, and the gear tooth root is subjected to finishing treatment based on a theoretical calculation result. And finally, the gear is processed to obtain the high-performance gear, so that the bending fatigue resistance of the gear tooth root is improved. And according to the gear material performance, the ultrasonic rolling strengthening tooth root performance parameters are determined. According to the stress relation, the tooth root residual stress after ultrasonic rolling strengthening is calculated, then the gear is subjected to barreling finishing machining analysis, the theoretical minimum roughness after barreling finishing is calculated according to the barreling finishing abrasive particle radius and tangential force, and finally actual machining is conducted. According to the method, grinding micro-modification, ultrasonic rolling strengthening and barreling finishing can be combined, the tooth surface of the gear is strengthened by correcting all technological parameters, the performance of the tooth root after machining is improved, and meanwhile the machining precision of the gear is improved.

The utility model relates to the technical field of gear detection, and discloses a gear thickness detection device which comprises a bottom plate, the upper surface of the bottom plate is fixedly connected with an L-shaped plate and a supporting plate, the other end of the L-shaped plate is connected with a detection mechanism, the upper end of the supporting plate is connected with a rotating mechanism, and one end, close to the L-shaped plate, of the rotating mechanism is connected with a moving mechanism. The other end of the moving mechanism is connected with two clamping assemblies, the other ends of the two clamping assemblies are connected with clamping rods, and the two clamping rods are parallel up and down. According to the gear thickness detection device, when the tooth thickness of a gear needs to be detected, only the clamping assembly needs to be controlled to move through the moving mechanism, then the gear can be clamped from the two sides through the two clamping rods, then the height of a tooth root is detected through the detection mechanism, and after the gear is controlled to rotate by a certain angle through the rotating mechanism, the gear thickness is detected. And the height of the tooth crest is detected through the detection mechanism, and finally the height difference between the tooth root and the tooth crest is obtained, so that the tooth thickness can be directly obtained, and convenience and rapidness are achieved.

The utility model discloses a spline matching structure and a transmission. The technical problems that under the action of alternating loads, gaps between existing splines are prone to causing abrasion and fatigue risks, and in addition, due to the consideration of machining errors and easy assembly, the risk of partial fretting abrasion still exists are solved. The synchronizer is provided with an internal spline; the second shaft is provided with an external spline; the tooth crest of the external spline is in interference fit with the tooth groove of the internal spline; the tooth crest of the internal spline is in clearance fit with the tooth groove of the external spline; the tooth sides of the spline teeth of the external spline and the spline teeth of the internal spline are in transition or clearance fit; the two sides of the tooth root of each spline tooth on the inner spline are each provided with a groove. According to the utility model, the external spline and the internal spline adopt a static connection matching mode of large-diameter centering interference fit, so that the problem of meshing eccentricity of a spline pair is solved, the probability of fretting wear caused by eccentricity of the spline pair is reduced, the service life of the static connection spline pair is prolonged, and the torque transmission reliability is improved.

The invention provides a straight gear system crack fault diagnosis method based on an actual crack propagation curve, and the method specifically comprises the steps: building a gear dynamics analysis model based on the modal condensation of a gear; combining historical data of a gear crack fatigue propagation experiment to obtain a tooth root crack propagation path, and substituting the tooth root crack propagation path into the gear dynamics analysis model to obtain the time-varying meshing stiffness of the gear containing the cracks; simulation acceleration signal data are obtained through a gear dynamics analysis model, and tooth root crack degree identification features are established; and the tooth root crack degree identification features serve as actual signals, and the expansion degree of gear cracks is judged through a variational mode decomposition method. The invention provides a method for improving tooth root crack recognition by considering the condition that a center distance error and a misalignment error exist at the same time. According to the method, index construction is carried out through simulation, noise interference of the measurement environment is reduced through a variational mode decomposition reconstruction method, and crack vibration impact characteristics hidden in periodic signals are extracted.

The invention discloses a method and device for intelligently achieving implant anchorage position generation, and the method comprises the steps: carrying out the fusion of oral cavity CBCT data and oral scanning model data, obtaining a fusion three-dimensional model, and carrying out the registration of the oral cavity CBCT data and the oral scanning data based on a non-rigid I CP algorithm during the fusion; performing feature point extraction on the fused three-dimensional model to obtain a feature point heat map, performing risk region division on the fused three-dimensional model to obtain a risk region, determining a bone mineral density grading map based on the fused three-dimensional model, and dividing a tooth root three-dimensional safety boundary; determining at least one target feature point based on the feature point heat map, the risk area, the bone mineral density grading map and the tooth root three-dimensional safety boundary, and determining implant anchorage position information corresponding to the target feature point based on the target feature point; and screening out an optimal implant anchorage target position from the implant anchorage position information. The purpose of intelligently determining the position of the implant anchorage is achieved, and the defects in the related technology are overcome.

The invention discloses an involute helical gear forming grinding force prediction method, which comprises the following steps: firstly, based on a helical gear forming grinding space motion relationship, establishing a helical tooth surface model comprising an involute surface and a tooth root transition curved surface, and constructing a geometric contact model of a grinding wheel and a gear; then, tooth surface deformation data obtained after heat treatment are obtained through a three-coordinate measuring machine, coordinate mapping is carried out, and the grinding depth and contact parameters are corrected; on the basis, a grinding force integral model considering the heat treatment influence is established by combining a plane grinding mechanism, and integral calculation is carried out on tangential and normal grinding force of a tooth surface involute section, a transition arc section and a tooth bottom section; finally, actual measurement data are obtained through a grinding experiment, and model parameter calibration is completed. According to the method, dynamic and accurate prediction of tangential and normal grinding force in the bevel gear forming and grinding process can be achieved, and a reliable basis is provided for mechanical behavior analysis and process optimization in the gear machining process.

The utility model provides a dental instrument which comprises a shell-shaped body with a plurality of tooth containing cavities, the shell-shaped body further comprises an extension part and a traction part, the extension part is formed by extending the edges of the tooth containing cavities towards the gingiva direction, the traction part protrudes from part of the surface of the extension part towards the far-tooth direction to form a cavity structure, and in addition, the traction part is connected with the extension part. The traction part and the edge of the extension part are arranged at an interval; the side surface of the traction part is provided with a containing cavity used for hanging a traction piece, and when the traction device is worn, the extension part covers and wraps part of gingiva. The traction part in each embodiment of the utility model not only can replace the function of an anchorage nail to provide anchorage force or orthodontic force, but also solves a series of negative effects that in the prior art, an implanting nail needs to be driven into a tooth root, and trauma is caused to the interior of the mouth of a patient.

The invention relates to an orthodontic tooth division accurate measurement method and system based on digital scanning, and the method comprises the steps: collecting the initial three-dimensional scanning data of teeth of a patient, and obtaining the dynamic change data of the teeth; performing association mapping processing on the tooth dynamic change data to obtain a tooth space position file; based on the tooth space position file, adopting an iterative comparison algorithm to be matched with subsequent scanning data, and judging deviation values of tooth gap width and tooth root inclination in an orthodontic process; the deviation value is analyzed, and real-time dental arch curve adjustment parameters are obtained; based on the real-time dental arch curve adjustment parameters, determining an optimization direction of an individualized tooth division scheme; and performing feedback circulation on the overall tooth space position file by adopting the optimization direction to obtain a final dynamic integration measurement result. According to the invention, through fusion of deep learning and time sequence analysis, accurate tracking of dynamic changes of teeth is realized.

The invention provides a multi-modal tooth root quantitative analysis method and system based on a residual neural network, and the method comprises the steps: obtaining multi-modal image samples of tooth roots, each multi-modal image sample comprises a pair of 5T high-field oral MRI images of the same tooth root part, and forming a tooth root 5TMRI and CBCT image data set; the constructed and trained tooth root image registration model comprises an image preprocessing module, a residual neural network, a rigid registration module and a spatial transformation module; a 5TMRI image to be registered and a CBCT image to be registered are subjected to the trained tooth root image registration model, and a 5TMRI image and a CBCT image after registration are obtained; a quantitative analysis result is obtained; the periodontal health degree is judged; according to the method, higher registration precision can be realized, the tooth and periodontal health conditions are judged based on the registered image, objective quantitative evaluation of the tooth and periodontal health conditions is realized, and the accuracy of judging the tooth and periodontal health conditions is improved.

The invention discloses a design and preparation method of a personalized gradient thickness invisible orthodontic appliance model, relates to the technical field of tooth orthodontics, and aims to overcome the defects that the thickness is uncontrollable and preset mechanical properties cannot be accurately realized when an invisible orthodontic appliance is manufactured by a traditional hot press molding process. The method comprises the following steps: firstly, reconstructing a personalized dental model containing tooth roots and bone tissues based on CBCT data of a patient; designing a plurality of gradient thickness appliance schemes; through finite element analysis and simulation, selecting an optimal scheme which is most favorable for realizing correction effects such as overall movement of teeth; and finally, integrally forming and manufacturing the selected appliance by adopting a direct 3D printing technology. The direct 3D printing ensures that the appliance can be manufactured in a high-precision and high-fidelity manner from a complex gradient thickness structure with thick gingiva and thin occlusal surface, so that the optimized mechanical property verified by simulation can accurately reproduce in a real object, the inherent defects of a hot-pressing film process are thoroughly overcome, and the accuracy and predictability of correction are remarkably improved.