73 results about "Tooth Preparations" patented technology

The invention provides a method and device for displaying oral data, computing equipment and a program product. The method comprises the steps that first oral cavity data are obtained, the first oral cavity data comprise three-dimensional data of a dental arch, and the dental arch comprises teeth to be repaired; acquiring second oral cavity data through the intraoral scanner, wherein the second oral cavity data comprises scanning data of the to-be-repaired teeth subjected to tooth preparation processing; identifying tooth regions in the first oral data and the second oral data, and identifying a tooth position of the tooth to be repaired based on a difference between the tooth regions in the first oral data and the second oral data; combining the first oral cavity data and the second oral cavity data based on the identified tooth position of the tooth to be repaired to obtain updated three-dimensional data of the dental arch; and displaying the updated three-dimensional data of the dental arch. In this way, an automated workflow is provided for efficiently generating an oral cavity model containing both a complete dental arch form and a precise tooth preparation form without the need to manually mark a tooth preparation region, thereby improving the accuracy and convenience of oral cavity scanning.

The invention discloses a segmentation and evaluation method for a tooth preparation shoulder, relates to the technical field of oral medicine digitization, and aims to solve the problems of low segmentation precision, neglect of anatomical distinguishing, single evaluation, unsmooth boundary and the like of an existing method. The method comprises the following steps: shoulder coarse segmentation: screening three-dimensional grid cube units based on an average curvature, and extracting a coarse segmentation shoulder of a maximum connected domain; carrying out shoulder fine segmentation, extracting inner and outer contours, and then carrying out optimization by using a greedy algorithm (ensuring smoothness through inner energy, and enabling outer energy to fit concave-convex characteristics); performing multi-quadrant division, dividing a mesial region, a distal region, a labial region and a lingual region by taking a long axis of a tooth body as a reference, and fitting boundaries by using a B spline; in the evaluation stage, the gingival height and shoulder width of each region are quantified, the weighted average height is calculated to obtain a basic score, and a final score is obtained by combining region balance deduction. The method is high in segmentation precision, achieves differentiated and comprehensive evaluation, is convenient to operate, and is suitable for oral cavity practical operation teaching and false tooth design scenes.

The invention relates to the technical field of image analysis, in particular to a tooth preparation quality evaluation method and system based on image recognition. According to the method, the three-dimensional form of the tooth preparation area is subjected to point cloud reconstruction, so that the form characteristics of the tooth surface are accurately obtained, and the integrity and fineness of data are ensured. And in combination with light intensity reflection calculation of an illumination incident angle, the matching degree of the point cloud data is improved, so that the tooth surface information is more accurate. On the basis of curvature gradient analysis, the local change trend in the preparation area is identified, and the more sensitive capture capability for morphological details of different areas is ensured. The depth deviation distribution screening mechanism enhances the accuracy of the regional deviation, so that the morphological measurement is more stable. And an analysis model is established through spatial distribution of regional angle deviation in a normal vector calculation mode, so that the curved surface deviation can be compared according to a real anatomical form, and the evaluation of the tooth preparation quality better meets physiological requirements.

The invention discloses an extruded thread trimming detection method, an extruded thread system and application. The method comprises the following steps: calling an impedance reference template bound with a material and a tap index, synchronously collecting steady-state alternating-current impedance of each chip groove at different depths of a thread, calculating deviation according to a groove position weight, setting two-stage threshold values to generate local or overall abnormal marks, then carrying out partitioned statistics on the continuous interval length and number of the abnormal marks, and finally, carrying out statistical analysis on the continuous interval length and number of the abnormal marks. And obtaining a thread overall quality judgment result. According to the technical scheme, the tooth crest trimming quality can be nondestructively detected in real time in the tooth trimming process on the premise that the machining takt is not affected, batch rework or scrapping caused by later spot check is avoided, and the method is suitable for thread batch production with the high quality requirement.

The invention belongs to the field of dental restoration digitalization, and particularly relates to an anterior tooth layered resin filling restoration method based on the guidance of a digital guide plate. Comprising the following steps: S1, obtaining a three-dimensional digital model of an abutment tooth preparation body; s2, generating a digital model of the dentin form of the defect part layer by layer by using oral cavity computer-aided design software; s3, completing the design of the enamel layer form on the digital model of the dentin form of the last layer of tooth defect part; s4, cover shell type guide plates covering adjacent teeth of the defective teeth are designed, and the cover shell type guide plates are numbered; s5, performing 3D printing on each layer of model and the guide plate, and checking the in-place condition of the guide plate; and S6, filling corresponding dentin resin and enamel resin in each stage of guide plate, resetting the guide plate filled with the resin to the oral dentition, and completing layered resin filling through illumination curing. According to the method, the process is optimized, the operation is simplified, and the operation precision is ensured by fully utilizing the advantages of the digital technology.

Embodiments of the present disclosure relate to a method, apparatus, device, and medium for extracting a cervical margin line of a tooth preparation, wherein the method includes: acquiring a three-dimensional digital model of the tooth preparation, and acquiring a candidate two-dimensional digital image corresponding to the three-dimensional digital model; determining a candidate cervical margin line according to the candidate two-dimensional digital image; and obtaining a target cervical margin line by performing error correction processing on the candidate cervical margin line in the three-dimensional digital model.

The invention provides a mechanical arm path planning method and device for anterior tooth preparation, relates to the technical field of tooth preparation path planning, and aims to realize precise tooth preparation operation in a complex oral environment. The method comprises the following steps: constructing an anterior tooth preparation digital model according to oral scanning data of a patient, the anterior tooth preparation digital model representing a target form of a repaired tooth; according to the anterior tooth preparation digital model, a bur motion coordinate system is constructed, and the bur motion coordinate system is used for providing space origin reference for tooth preparation path generation; by taking the geometric parameters of the machine needle and the anatomy of the oral cavity of the patient as constraints and taking the anterior tooth preparation digital model as a starting point, reversely calculating a tooth preparation path of cutting from an original tooth body of an anterior tooth to the anterior tooth preparation digital model under the machine needle motion coordinate system; and converting the tooth preparation path into a mechanical arm control instruction to control a mechanical arm to carry out tooth preparation operation on the original anterior tooth body in the oral cavity of the patient.

The invention relates to the technical field of all-ceramic false tooth grinding, and discloses an all-ceramic false tooth grinding system and a false tooth preparation method thereof.The all-ceramic false tooth grinding system comprises a grinding unit, a transmission unit and a rotating unit, the grinding unit comprises a grinding assembly, and a first circular containing barrel and a second circular containing barrel are arranged at the bottom of the grinding assembly; all-ceramic false teeth are placed in inner cavities of the first circular placement barrel and the second circular placement barrel, and the grinding assembly is used for grinding the placed all-ceramic false teeth; the rotating unit comprises two rotating shafts. According to the device, the driving assembly drives the first circular placement barrel, the second circular placement barrel and the rotating unit to rotate by one circle, and after one circle of rotation is completed, the driving assembly can drive the ejector rod to unlock the rotating unit, so that the rotating unit is driven by the rack to rotate by 180 degrees; therefore, the surfaces of the placed false teeth can be changed, the false teeth can be ground conveniently through the grinding assembly, and manual surface changing is not needed every time when the surfaces are changed.

The invention relates to a tooth preparation teaching system and method, electronic equipment and a storage medium. The client side is in communication connection with the server side, and the client side comprises a teacher side and a student side; the scanning module is used for acquiring model data of teeth; the workbench is used for packaging the client and enabling the client to communicate with the scanning module; the teacher end is used for configuring teaching information and distributing the teaching information to the student ends; the student end is used for receiving teaching information and calling the scanning module to obtain a tooth preparation front tooth model and a tooth preparation rear tooth model; the server is used for storing teaching information, the tooth model before tooth preparation and the tooth model after tooth preparation, and performing scoring calculation to generate a scoring result; and the scanning module is also used for comparing and calculating the tooth model before tooth preparation and the tooth model after tooth preparation to generate comparison result data. According to the invention, full-process digital management of tooth preparation teaching is realized, and the efficiency of tooth preparation teaching is improved.

The present application relates to the technical field of oral prosthetics, in particular to a porcelain dental prosthesis color prediction system, a construction method and a prediction method, comprising: a multi-modal image acquisition module for acquiring high-definition color images of natural teeth in the oral cavity, three-dimensional scanning images of tooth preparation surfaces and microstructure images of porcelain prosthesis substrates, and synchronously acquiring environmental light parameters; an image recognition processing module for processing original data, outputting natural tooth color space feature vectors, tooth preparation surface morphology parameters and porcelain layer substrate micro-pore distribution parameters; an intelligent color prediction module for constructing a deep learning model, combining an environmental light correction algorithm to predict the final presented color data of the prosthesis; a parameter output and optimization module for generating a color deviation report, outputting porcelain layer thickness adjustment suggestions and firing process parameter optimization schemes, and supporting visual display of the prediction effect. Thus, the problems of one-sided prediction dimension and subjective optimization in the prior art are solved.

The embodiment of the invention discloses a tooth preparation monitoring method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring a preoperative model and a current tooth preparation model of a target object; a current tooth preparation monitoring mode and a model import result are determined, the model import result indicates whether an import model exists in current tooth preparation monitoring or not, and the import model comprises a formal restoration model or a formal preparation model corresponding to the target object; according to the current tooth preparation monitoring mode and the model import result, two sets of target models are selected from the preoperative model, the current tooth preparation model and the import model for comparison, and a tooth preparation monitoring result is obtained. According to the embodiment of the invention, the tooth preparation monitoring is carried out by comparing the digital models of the target object in different stages, a silicon rubber guide plate is not needed for tooth measurement in the checking process, and the problem of insufficient tooth measurement precision caused by the use of the silicon rubber guide plate for tooth measurement is solved.

The invention discloses an adjustable calibration device and calibration method for assisting tooth preparation, the device comprises a calibration tray, the calibration tray is provided with a common in-place track calibration table, the calibration table is arranged on the calibration tray and can slide along the common in-place track, and the calibration table is also provided with a plurality of calibration tracks; and the calibration rod assembly comprises a fixed rod and a calibration rod which are connected with each other, and the fixed rod is vertically connected to the calibration track. The adjustable calibration device for assisting tooth preparation is simple in structure, easy to manufacture, relatively low in cost and easy to use, and can realize accurate detection of tooth preparation amount through the synergistic effect of the calibration table and the calibration rod assembly, so that insufficient preparation or excessive preparation is avoided; the shaft wall parallelism of multi-tooth preparation can be verified at the same time through combined application of a plurality of calibration tables, the consistency of in-position paths of prostheses is ensured, and the calibration table is suitable for the preparation process of fixed prostheses such as full crown, veneering and inlay restoration and can be well applied to oral medicine and biomedical engineering industries.

A method of installing a fiber post for a post and core dental restoration uses a fiber post system which has a plurality of fiber posts having at least two distinct diameters for the fiber posts and at least two preformed fiber post lengths for the fiber posts. Each fiber post containing a visible depth marker indicative of where the post should be placed above and below root orifice, whereby the fiber post selected is configured to be based upon the root length of the specific tooth obturated, yielding proper post space preparation apically for cementation and coronally for foundational core build up. The resulting implanted post eliminates or minimizes post manipulation during tooth preparation to create a mono-block of core material around the post during cementation and build up resulting in no disruption of either bond during preparation.

The invention relates to a high-hardness and high-toughness cast steel bucket tooth and a preparation method thereof, and belongs to the technical field of bucket tooth preparation. The cast steel bucket tooth comprises 0.27%-0.30% of C, 1.80%-2.20% of Si, 1.20%-1.50% of Mn, 0.50%-0.80% of Cr, less than or equal to 0.01% of P, less than or equal to 0.01% of S and the balance Fe. Under the cooperation of component adjustment and a heat treatment process, the prepared bucket tooth material is low in cost, economical and practical, and has high strength, high hardness and better low-temperature toughness at the same time. The mechanical properties of the cast steel bucket tooth are as follows: Rm is greater than or equal to 1600MPa, the hardness is greater than or equal to 450HB, and the impact absorbing energy Akv at-40 DEG C is greater than or equal to 30J.

The invention provides a digital tooth preparation guide plate based on a tooth preparation body model and a manufacturing method thereof. The digital tooth preparation guide plate is high in precision and replicability, and solves the problems that tooth preparation is poor in precision, depends on experience, is low in efficiency and the like in the prior art. The device structurally comprises a tooth preparation guide plate platform, a speed reduction transmission mechanism, a feeding cam, a transverse translation sliding rail, a longitudinal pressing assembly and a profiling guide needle assembly, wherein the profiling guide needle assembly comprises a guide needle and a support of the guide needle, is consistent with a target prosthesis in shape and is used for guiding a needle path; the mobile phone clamping assembly and the tooth preparation body clamping assembly are used for fixing a tooth preparation body model and preventing displacement; the 3D printing guide plate is manufactured based on the digital model, is attached to the dentition of the patient and is used for intraoral positioning.

The invention discloses a tooth preparation grinding path generation method, and relates to the field of dental restoration, and the method comprises the following steps: obtaining a to-be-ground tooth point cloud model and a preparation body point cloud model; aligning the to-be-ground tooth point cloud model with the preparation body point cloud model; expanding the preparation body point cloud model to obtain an expanded preparation body point cloud model; based on the expanded preparation body point cloud model and the to-be-ground tooth point cloud model, a path reference area is extracted, and denoising is carried out; dividing the path reference area into a closed-loop area and an open-loop area; generating a closed-loop area grinding path; generating an open-loop area grinding path; and after the open-loop area grinding path is added to the closed-loop area grinding path, a tooth preparation grinding path is obtained. The method is used for solving the problems that in the prior art, tooth preparation grinding path planning depends on subjective experience of attending doctors, and an automatic and standardized path planning method is lacked, and the purpose of providing a standardized path generation method for automatic tooth preparation work is achieved.

The application discloses a kind of generation methods of dental preparation grinding path, it is related to dental prosthetic field, including obtaining to-be-ground tooth point cloud model, preparation body point cloud model;To-be-ground tooth point cloud model is aligned with preparation body point cloud model;Preparation body point cloud model is inflated, and preparation body point cloud model after inflation is obtained;Based on preparation body point cloud model after inflation and to-be-ground tooth point cloud model, extract path reference area, denoising;Path reference area is divided into closed loop area, open loop area;Closed loop area grinding path is generated;Open loop area grinding path is generated;Open loop area grinding path is added after closed loop area grinding path, and dental preparation grinding path is obtained.The application is used to solve the problem that the grinding path planning for dental preparation in the prior art depends on the subjective experience of the attending physician, lacks automated and standardized path planning method, to achieve the purpose of providing a standardized path generation method for automated dental preparation operation.

A tooth preparation baffle facilitating surgical operation comprises a tooth preparation baffle body and a clamping base, and the tooth preparation baffle body is connected with the clamping base through a connecting arm; the tooth preparation baffle body comprises a first baffle making contact with the tongue and a second baffle making contact with the inner side of the lip, the inner side of the first baffle and the inner side of the second baffle are each provided with a protruding upper connecting protruding piece, the bottom of each upper connecting protruding piece is provided with an upwards-concave first inserting groove, and each first inserting groove is connected with one end of the corresponding connecting arm. The clamping base comprises a connecting bow and tooth side clamping wings, the two ends of the connecting bow are connected with the tops of the tooth side clamping wings on the same side respectively, the outer sides of the tooth side clamping wings are provided with protruding lower connecting protruding pieces, the tops of the lower connecting protruding pieces are provided with second inserting grooves recessed downwards, and the second inserting grooves are connected with the other ends of the connecting arms. The tooth baffle plate main body can block the tongue and open the lip, and is matched with the connecting arm and the clamping base to reserve enough space for bonding the dental crown without influencing the bonding, and cotton rolls or medical cotton balls can be stuffed into the gaps to effectively insulate moisture.

The application discloses a detachable digital guide plate for assisting fiber post and resin core repair and a manufacturing method. The detachable digital guide plate comprises a base guide plate and a post core guide plate assembled through a mortise and tenon joint structure. The guide plate is manufactured by using digital technology, fully considering the complexity and individual differences of the root canal morphology of natural teeth, and setting the post core position with the expected repair effect as the target, effectively assisting the accurate positioning and forming of the post core in the tooth defect repair, the fiber post bonding and the resin nucleation, especially suitable for the complex repair treatment of the multi-abutment row joint crown or fixed bridge. Not only can the guide plate assist the accurate positioning and bonding of the fiber post, but also can control the nucleation space position and shape of each post core, effectively assist the multi-abutment to obtain the common positioning channel, reduce the clinical operation difficulty, improve the operation accuracy and the quality of the oral repair treatment, and reduce the tooth preparation time of the clinician at the chair.

The application relates to the technical field of rotary digging tooth preparation, and discloses an alloy rotary digging tooth coating and a process, which comprises a tooth body, the tooth body is provided with an alloy reinforcing coating area on a conical surface, the alloy reinforcing coating area comprises a plurality of reinforcing frames in a hexagonal structure, each reinforcing frame is connected with adjacent reinforcing frames on the periphery to form a honeycomb structure, each reinforcing frame is provided with an enhancing layer in a hexagonal structure, and an adapter layer in a triangular structure is formed between each adjacent reinforcing frame; wherein the reinforcing frame is prepared from the following raw materials in weight: 10-30 parts of pig iron, 1-4 parts of metal manganese and 0.2-0.6 parts of metal titanium; the enhancing layer is prepared from the following raw materials in weight: 0.45-0.6 parts of metal silver, 5-10 parts of metal tin and 0.12-0.55 parts of metal titanium; and the adapter layer is prepared from the following raw materials in weight: 1-4 parts of metal nickel and 4-6 parts of metal cobalt. The rotary digging tooth is not easy to be damaged for a long time, and the service life of the rotary digging tooth is greatly improved.

The invention relates to a dental implant structure of a horizontally moving abutment and a dental crown, which is characterized in that an inner multi-square concave part is arranged at the center above an implant, an inner hole is formed in the inner multi-square concave part, a multi-prism lower half part matched with the inner hole is arranged in the inner hole, an implant screw hole is formed in the bottom of the inner hole, the multi-prism lower half part and the multi-prism upper half part are respectively a regular multi-prism body and a multi-prism cone, and the dental crown is adhered to the periphery of the abutment. The center part of the lower end of the abutment is provided with a concave part matched with the polygonal cone, the center position of the polygonal cone is provided with a polygonal screw hole which is communicated up and down, the upper end of the dental crown is provided with a fixing hole, and a fixing wire passes through the fixing hole, the through hole, the polygonal screw hole and the implant screw hole from top to bottom, so that the dental crown, the abutment, the polygonal cone and the implant are connected into a whole. The problems of existing tooth preparation, reduction of tooth gaps between tooth necks, prevention of food impaction, reduction of bad breath and the like can be solved, the service life of the implant tooth is prolonged, and the aesthetic property of the tooth is improved.

The utility model belongs to the technical field of standard prepared teeth, and particularly relates to a standard prepared tooth model and a prepared tooth training device. The tooth comprises a tooth body, the tooth body is sequentially provided with an outer-layer tooth body and an inner-layer tooth body along the tooth preparation direction, the hardness and the thickness of the outer-layer tooth body are matched with those of enamel, and the hardness of the inner-layer tooth body is matched with that of dentin; meanwhile, a tooth preparation layer with a specified thickness is arranged from the surface of the outer-layer tooth body to the direction of the inner-layer tooth body, a middle floating layer with a specified thickness is arranged from the tooth preparation layer to the direction of the inner-layer tooth body, and a tooth body area in the middle floating layer forms a base layer; at least two of the tooth preparation layer, the middle floating layer and the base layer are made of fluorescent materials which can be developed under ultraviolet rays, and color differences exist among fluorescent colors of different layers. According to the utility model, the operation is convenient, and the purpose of quickly and recessively judging the tooth preparation result can be realized through a unified standard.

The tooth preparation robot trajectory optimization method based on end stiffness perception is disclosed, and belongs to the technical field of oral medical robots. The method collects the tool contact point coordinate information of the theoretical preparation trajectory and the actual preparation trajectory, calculates the end stiffness matrix and the flexibility matrix of the mechanical arm, analyzes the deformation of the tool contact point under the action of force, and evaluates whether the deformation is stiffness dominated. On this basis, the robot motion direction is optimized according to the end stiffness characteristics, the direction with the maximum stiffness and the minimum deformation is selected as the motion direction of the tooth preparation trajectory, so that the trajectory deviation caused by the end force is effectively suppressed, and the precision and stability of the tooth preparation are improved. The present application realizes intelligent compensation and adaptive adjustment of the robot trajectory in the complex stress environment by combining stiffness perception and direction optimization, is suitable for robot-assisted operation of high-precision oral prosthetic surgery, and has important clinical application value.

The invention relates to the field of dental instruments, in particular to a combined crown cutting guide plate and a design and preparation method thereof. The combined crown cutting guide plate comprises a public main guide plate and at least one cutting sub-guide plate detachably connected with the public main guide plate. The common main guide plate comprises abutment retention plates arranged on the two sides, and a first connecting rod and a second connecting rod which are connected with the abutment retention plates on the two sides; a crown cutting working area is defined by the first connecting rod, the second connecting rod and the abutment tooth retention plate; the cut-off guide plate is installed between the first connecting rod and the second connecting rod, and the cut-off guide plate is provided with an irregular cut-off face which is attached to a to-be-cut crown tooth body and enables the to-be-cut crown tooth body to be exposed. Compared with the prior art, the combined crown cutting guide plate disclosed by the invention can meet the requirement that redundant tooth tissues outside a common insertion path are cut off in the tooth preparation process of teeth with relatively large inclination in the long axis direction of the teeth, so that the common insertion path is obtained, and the requirement of minimally invasive tooth preparation is met as much as possible.

The application discloses a precision preparation device for a wear-resistant coating on a surface of a false tooth and relates to the field of false tooth preparation.The device comprises a preparation device, a support platform is fixedly installed on the upper surface of the preparation device, a plurality of equipment processing parts are arranged around the edge of the upper surface of the support platform, a fixing groove is formed in the middle of the top of the support platform, a five-axis linkage table is rotatably installed on the inner wall bottom of the fixing groove, a multidirectional adjusting mechanism is arranged on the upper surface of the five-axis linkage table and is used for adjusting the processing angle of the false tooth, and the multidirectional adjusting mechanism comprises a No.1 support base.Through the five-axis linkage table and the multidirectional adjusting mechanism, the structure design of the double-drive part linkage universal shaft can drive the false tooth to realize full-dimension and dead-angle-free posture adjustment in space, ensure that the coating deposition particles are always perpendicular to the surface to be processed, fundamentally solve the problems of uneven curved surface deposition and existence of shadow dead angle caused by the fixed target position and simple rotating stand of the existing device, and improve the uniformity and precision of coating preparation compared with the prior art.

The utility model belongs to the technical field of dental training, and particularly relates to a dental training model and a dental training device. The tooth comprises a tooth body, the tooth body is of a double-layer structure, and an outer-layer tooth body with the hardness and the thickness matched with those of enamel and an inner-layer tooth body with the hardness matched with those of dentin are sequentially arranged in the tooth preparation direction; at least one of the inner-layer tooth body and the outer-layer tooth body is made of a fluorescent material which can be developed under ultraviolet rays, and when the inner-layer tooth body and the outer-layer tooth body are both made of the fluorescent material, color difference exists between fluorescent colors of the inner-layer tooth body and the outer-layer tooth body. According to the utility model, the operation is convenient, and the purpose of quickly and recessively judging the tooth preparation result can be realized through a unified standard.

The invention discloses a precise positioning device for preventing adjacent surface damage for tooth preparation, and relates to the technical field of tooth preparation related equipment. The device comprises two transverse rods, the two transverse rods are symmetrically arranged in the front-back direction, the left end and the right end of each transverse rod are each provided with an abutting curved block, the opposite surface side walls of the two transverse rods are each provided with an adjusting opening, and the lower side walls of the adjusting openings are each provided with a plurality of positioning openings which are linearly and evenly distributed. Positioning arc strips are arranged at the positions, corresponding to the stretching plates, of the opposite surface side walls of the two transverse rods. A protection rod is arranged between every two rotating rods in the same front-back direction, and the surface side of each protection rod is sleeved with a foam cushion cylinder. The protection plates can freely move up and down in the middle strip opening and the penetrating strip opening, adjacent teeth of tooth preparation abutment teeth can be conveniently protected, meanwhile, the protruding blocks on the side walls of the positioning arc strips move out in the positioning opening, the distance between the two protection plates can be adjusted, and it is guaranteed that the position is stable after adjustment.