319 results about "Tooth root" patented technology

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 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 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 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 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 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 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 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 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.

The invention discloses a rotary speed reducer gear tooth root strength test device which comprises a test bed, a mounting mechanism, a rotating mechanism, a limiting mechanism, a strength test mechanism and an observation mechanism. A mounting mechanism is arranged in the center of the test bench to fix a to-be-tested gear and can adapt to replacement of gears of different specifications; the mounting mechanism is connected with a rotating mechanism under the test bench, and a rotating motor is provided with an encoder to realize accurate rotation angle switching of a gear; limiting mechanisms are arranged on the left and right sides of the mounting mechanism and can move in the radial direction to be engaged with the gears for limiting or separated for avoiding. Strength test mechanisms are arranged in front and back, can be adjusted in the radial direction, can be meshed with a single tooth to apply force, and can be fed back by a force sensor to switch postures by rotating an oil cylinder and an air cylinder; an observation mechanism on the strength test mechanism is used for detecting tooth root cracks by using an endoscope and marking the tooth root cracks through a spray head. The device does not need repeated positioning, can continuously detect each tooth root, improves the efficiency and precision, is adaptive to gears of various specifications, and meets the industrial detection requirements.

The invention provides a bionic stubble cutting knife, a bionic stubble cutting knife device and a design method, and relates to the technical field of agricultural machinery, the bionic stubble cutting knife comprises a knife disc base body and a plurality of knife teeth uniformly distributed along the circumference of the knife disc base body in the same direction, each knife tooth comprises a main cutting edge, a tooth tip, a knife back and a tooth root reinforcing rib which are connected in sequence, and the angle of the main cutting edge imitates the upper jaw of a earwig. The outer contour curve of the cutter tooth is formed by sequentially connecting a main cutting edge curve, a tooth top curve, a cutter back curve and a tooth root reinforcing rib curve in a transition mode, and the connecting points of the curves are tangent. The bionic stubble cutting knife device comprises a bionic stubble cutting knife, a connecting structure, a vibration reduction structure, a connecting spring and a driving device, and the vibration reduction structure adopts a two-stage composite vibration reduction system. Through a bionic cutting structure, a two-stage vibration reduction system and a flexible adaptive design, cooperation of efficient cutting, stable operation, cost reduction, efficiency improvement and environmental protection is achieved, a better solution is provided for agricultural stubble cutting operation, and technological upgrading of agricultural machinery equipment is promoted.

Electric motor device (10) for driving a sunroof (2) or a roller blind in a vehicle (100), comprising: a rotor device (20) comprising an at least partially cylindrical outer surface (21); a stator device (30) having a core (31) including a plurality of stator teeth (32) projecting toward the rotor device (20), the stator teeth (32) comprising a tooth root (33) connected to a stator ring (34) and a tooth tip (35) having a wing-shaped tooth shoulder (36) on each side in a circumferential direction, the wing-shaped tooth shoulder (36) having a tip (37) formed at an end portion (47) of the respective wing-shaped tooth shoulder (36) in the circumferential direction; wherein the tooth tip (35) includes a surface (39) facing the at least partially cylindrical outer surface (21) of the rotor device (20) to form a gap (40) therebetween; wherein the surface (39) comprises: - a hollow cylindrical surface section (41) having a constant gap distance (g1) in the direction of the at least partially cylindrical outer surface (21) of the rotor device (20) in the circumferential direction, and - each having an inclined surface portion (42) having an increasing gap distance (g2) with respect to the at least partially cylindrical outer surface (42) of the rotor device (20) in the circumferential direction towards the respective tip (37) formed by the end portion in the circumferential direction; wherein the hollow cylindrical surface portion (41) includes a first radius (r1) with respect to a center axis (C) of the rotor device, and the tip (37) formed at the end portion in the circumferential direction has a second radius (r2) with respect to the center axis (C) of the rotor device (20); wherein a first ratio (r2 / r1) between the second radius (r2) and the first radius (r1) is 1.02 or more and 1.08 or less.

The application discloses a burr cleaning equipment for gear machining, and belongs to the technical field of gear machining, and the technical key points are as follows: the burr cleaning equipment comprises a bottom plate, a gear positioning mechanism and a gear polishing mechanism are arranged, and the gear body can be clamped and fixed in a self-adapting mode according to the inner diameter of the gear during burr cleaning, manual intervention is greatly reduced, the labor intensity of an operator is reduced, and the synchronous burr cleaning mode for the tooth surface, the tooth top and the tooth root reduces the corresponding clamping frequency and adjustment time, and the overall machining efficiency is significantly improved; the gear taking mechanism can quickly and stably complete gear grabbing, discharging and grabbing feeding operations, the movement characteristics of the multi-degree-of-freedom moving assembly can significantly shorten the single feeding and discharging time, the production efficiency is significantly improved compared with traditional equipment, and the burr cleaning equipment has the advantages of convenient gear taking and placing, high automation degree and high working efficiency.

The present application relates to gear processing forging equipment technical field, specifically a kind of temperature monitoring function's gear processing is forged device, and the forging device includes first forging machine, second forging machine, manipulator, test table, first forging machine is processed into intermediate body by hollow cylindrical raw material block, second forging machine is placed in first forging machine side, second forging machine is processed into gear-shaped forming body by intermediate body, test table is placed in second forging machine side, test table tests the tooth root toughness in the meshing process of forming body, manipulator is set between first forging machine, second forging machine, test table for transferring workpiece.Raw material block is heated to forging point using resistance heating mode, resistance heating electrode is set in first forging machine and second forging machine, first forging machine and second forging machine are with infrared probe to identify the temperature of raw material block and intermediate body in heating process.After obtaining intermediate body, the outer edge of heated intermediate body, so that the material that becomes tooth surface finally in second forging process is based on the material of original outer edge.

The large-modulus hardened gear ring structure comprises a gear ring and gear teeth arranged on the inner wall of the gear ring, one end of each gear tooth is a first tooth end, the other end of each gear tooth is a second tooth end, a first step is arranged on one side of each first tooth end, the first step is arranged on the inner wall of the gear ring, and the second step is arranged on the inner wall of the gear ring. A cutting groove is further formed between the first tooth end and the first step and connected between the first tooth end and the first step in a transition mode, the side face, close to the first tooth end, of the cutting groove and the axial end face of the first tooth end are located on the same vertical face, and the bottom end of the first step and the tooth root of the first tooth end are located on the same vertical face. A second step is arranged at the end, away from the first step, of the gear ring and arranged at the joint of the second tooth end and the gear ring, and the axial end face of the second step and the axial end face of the second tooth end are located on the same horizontal plane. According to the device, broken cutting caused by heat treatment deformation of the first tooth end and the second tooth end is reduced, so that the production efficiency of the large-modulus hardened gear ring is improved.

The removable anti-loosening false tooth comprises a false tooth main body, a tooth root connecting block is arranged at the bottom of the false tooth main body through a connecting groove with internal threads, and a tooth root sleeve for performing outer protection positioning on the tooth root connecting block is arranged at a bottom port of the connecting groove and located at the bottom of the false tooth main body; through the false tooth main body, the connecting groove, the tooth root connecting block, the tooth root main body and the threaded connecting part, the false tooth main body is fixed on the threaded connecting part on the tooth root connecting block through threads of the connecting groove for connection and fixation, so that the false tooth main body and the tooth root connecting block can be quickly fixed, and the tooth root sheath is positioned and sleeved outside the tooth root connecting block for protection; according to the structural connection mode, the false tooth main body only needs to be screwed to be separated from the tooth root connecting block in the picking and replacing process, so that the worn false tooth main body can be conveniently picked and replaced, and the problem of gingival injury caused by picking and replacing by virtue of a tool is avoided.

The application discloses a high-bearing low-noise special gear precision machining process, which comprises the following steps: precision die forging and isothermal normalizing, double-reference composite finish turning, self-adaptive roll-scrub composite near-net forming, segmented and partial-pressure gradient carburizing and quenching, deep cryogenic graded aging, reference reconstruction flexible honing polishing, pulse laser shock strengthening, tooth root fillet roll strengthening, full-parameter precision detection, hierarchical selection and micro-correction. The application solves the problems of large deformation, low precision, poor fatigue and high noise in traditional processes through the synergistic control of forming-stress-precision-surface morphology, and the special tooth profile is stably up to DIN 4-5 level, the tooth surface is Ra≤0.2 microns, the fatigue life is increased by more than 60%, and the noise is reduced by 6-10 dB. The process combination is not obvious and has outstanding creativity, and is suitable for high-precision batch manufacturing of special gears of high-end equipment such as new energy vehicles and high-speed heavy-duty transmission.

The present application relates to the field of medical informatics, and provides a tooth abnormal vibration signal detection system, comprising: an arc-shaped base body; a plurality of arc-shaped base body vibration sensors embedded in the arc-shaped base body, each arc-shaped base body vibration sensor corresponding to one of two sides of a predetermined implant implantation position of a user and being adjacent to a tooth, for real-time sensing of an external mechanical vibration signal acting on the arc-shaped base body and the two sides of the tooth; a bone conduction vibration sensor for sensing a bone conduction vibration signal conducted to the predetermined implant screw base through the jaw bone of the user; and a signal processing module for receiving the external mechanical vibration signal and the bone conduction vibration signal respectively, performing frequency domain conversion, calculating the similarity of first and second frequency spectrum characteristics, and outputting a same frequency judgment result. The present application improves the real-time detection accuracy of implant nail and tooth root collision, and improves the implant success rate and safety.

The application discloses a design method of an integrated titanium plate assembly for assisting midfacial suture distraction external support traction, comprising the following steps: scanning a target object by a medical scanning device to obtain a three-dimensional model of the internal structure and tissue of the target object, wherein the three-dimensional model at least comprises independently displayable bone structure and dental tissue; performing bone analysis on the bone structure of the target object based on the three-dimensional model to obtain the weak point of the bone structure; obtaining the tooth root position of the dental tissue of the target object based on the three-dimensional model; selecting the shape and size of an integrated titanium plate assembly model based on the bone analysis result, and determining the fixed hole position of the integrated titanium plate assembly model based on the tooth root position; and generating an integrated titanium plate assembly three-dimensional model based on the shape, size and fixed hole position of the integrated titanium plate assembly model. According to the individual differences of patients, the integrated titanium plate assembly for assisting midfacial suture distraction external support traction is designed to be more suitable for patients, and the postoperative traction effect is improved.

The invention discloses a cycloidal gear tooth profile three-section modification method. The cycloidal gear tooth profile is divided into a tooth root section, a meshing area section and a tooth top section; according to the thickness of the lubricating oil film, the modification gap at the tooth root is obtained, and according to the contact deformation at the tooth crest, the modification gap at the tooth crest is obtained; and by taking the return difference and the minimum contact stress in the dynamic transmission chain precision interval as boundary conditions, the modification clearance of the meshing area is obtained, the modification clearances at the tooth root, the meshing area and the tooth top are combined, and the tooth profile of the cycloidal gear is obtained according to the modification clearance curve. Different modification gaps can be designed according to different return differences and dynamic transmission chain precision intervals. A cycloidal gear tooth profile with controllable return difference and dynamic transmission chain precision and minimum contact stress when lubrication and stable and uniform meshing of a gear pair are considered can be obtained; the method is a modification method with higher precision.

This invention discloses a gear mold, an in-cavity sensing structure, a measurement system, and a measurement method. The gear mold includes at least one mold wall constituting the gear mold cavity. The in-cavity sensing structure includes a temperature sensing component and a pressure sensing component. The temperature sensing component includes at least a plurality of probes arranged in an array along key cavity positions. The key cavity positions include at least two of the gear's tooth tip forming area, tooth root forming area, and gate area. The pressure sensing component includes at least a plurality of ejector pins arranged in an array below the gear mold cavity. One end of each ejector pin abuts against a pressure sensing element. The probes are electrically connected via lead wires passing through the mold wall, and the pressure sensing element is electrically connected via a lead wire storage portion pre-embedded in the gear mold. Through an integrated sensing array layout deeply coupled with the gear mold structure, synchronous, direct, and in-situ monitoring of multi-point temperature and distributed pressure within the cavity during the precision gear injection molding process is achieved.

The present application relates to saw blade manufacturing technical field, and discloses a band saw blade manufacturing method and band saw blade, and the manufacturing method comprises the following steps: step S1, precision edge cutting;Step S2, tooth profile forming;Step S3, heat treatment strengthening;Step S4, composite straightening;Step S5, high-frequency welding;Step S6, partition roller pressing strengthening;Step S7, adaptive finishing;Step S8, closed-loop quality control;Band saw blade, hard alloy cutter head brazing is formed in the sawtooth part of tooth holder, and the multiple parallel roller pressing bands formed by partition roller pressing strengthening;Through the cooperation of partition roller pressing strengthening and adaptive finishing, the number and width of roller pressing areas are dynamically configured according to the width of band saw blade, reasonable isolation zones are set between adjacent roller pressing bands, local strengthening is realized, and the bending strength and fatigue resistance of tooth root are enhanced;According to the pitch, the process route is selected, and the tooth is ground after roller pressing strengthening or the tooth is ground before roller pressing, and the safety distance of roller working area and tooth root is reasonably controlled.

The utility model discloses an anti-shaking dental implant replacement body mold, and relates to the technical field of dental implant replacement body molds. The tooth comprises a tooth root, one end of the tooth root is provided with a restraining groove, the inner end face of the restraining groove is provided with a locking threaded hole, a guide block is installed in the restraining groove in a sliding mode, a tooth body is installed above the guide block in a sliding mode, a movable hole is formed in the center of the interior of the tooth body, and a protruding block is fixedly installed in the movable hole and is a circular ring. The tooth root is planted in the gingiva, then the guide block is installed in the restraining groove, the clamping groove is restrained by extruding the side face of the clamping groove through the extruding block, then the tooth body is installed above the guide block, and the bolt penetrates through the guide block and the locking threaded hole to be tightened. The guide block and the tooth body are restrained through the bolt, and the movable hole is filled with the filling material, so that shaking of the tooth body in the using process is reduced, and the service life is prolonged.

The application discloses a high-speed high-load low-vibration multi-engagement-zone gear and a tooth profile design method thereof, wherein the high-speed high-load low-vibration multi-engagement-zone gear comprises a first gear and a second gear, a tooth profile curve of the first gear comprises a first tooth crest curve segment L3, a first involute curve segment L2 and a first tooth root curve segment L1, a tooth profile curve of the second gear comprises a second tooth crest curve segment L3', a second involute curve segment L2' and a second tooth root curve segment L1', and the first tooth crest curve segment L3 and the second tooth root curve segment L1' are continuously engaged, the first involute curve segment L2 and the second involute curve segment L2' are continuously engaged, and the first tooth root curve segment L1 and the second tooth crest curve segment L3' are continuously engaged during the engagement of the first gear and the second gear. The application can effectively bear higher load, improves the load bearing capacity and the end face coincidence degree of the gear pair, and can make the transmission process more stable and better adapt to high-speed working conditions.

The application discloses a lock tooth integrated bucket tooth, which comprises a tooth root, a tooth seat assembly and a tooth tip assembly. One end of the tooth root is connected with a bucket body, and the other end of the tooth root is matched with one end of the tooth seat assembly, so that the tooth root and the tooth seat assembly have a combined first state and a separated second state. The other end of the tooth seat assembly is matched with one end of the tooth tip assembly, so that the tooth seat assembly and the tooth tip assembly have a combined third state and a separated fourth state. The other end of the tooth tip assembly is a free end. The application has a clever structure and reliable connection. During on-site disassembly and assembly, only a hexagonal wrench and a hook are needed to complete the on-site disassembly and assembly, and the problems of complicated operation, low efficiency and easy falling of the locking pin caused by defects of the prior art can be effectively solved.

Embodiments of the present application disclose a method and device for extracting root canal feature morphology based on CBCT data, equipment and medium, belong to the field of oral medicine and medical image technology, wherein the method comprises: filtering and denoising CBCT images and performing pulp segmentation processing, and performing surface rendering three-dimensional reconstruction on tooth root canals to generate a three-dimensional model; based on the regular point cloud data in the three-dimensional model, a point-surface method is used to realize surface reconstruction to generate a root canal entity model; the root canal entity model is subjected to coordinate alignment processing in a three-dimensional space, and the approximate center line of the fitted root canal is used to measure the root canal length, root canal opening direction, root canal curvature and pulp depth. The present application quickly reconstructs the corresponding three-dimensional model based on the CBCT tomographic images obtained by scanning the teeth of a patient, and obtains relevant data such as pulp depth and root canal opening size from the three-dimensional model of the teeth to assist the performance of oral surgery.