718 results about "Tooth crown" patented technology

The invention discloses a tooth three-dimensional digital model registration and tooth neck line extraction method based on oral scanning and CBCT, and relates to the field of tooth three-dimensional digital model registration. Comprising the following steps: respectively acquiring three-dimensional oral images of oral scanning and CBCT (cone beam computed tomography), and automatically segmenting three-dimensional structures of dental crowns and teeth by utilizing pre-trained V-Net and ToothNet image segmentation models. Alignment and registration of two modal images are realized through a feature extraction network, an information exchange network and a rigid transformation network. The feature extraction network extracts local and global features by using far-point sampling and a dynamic graph convolutional neural network, the self-attention and cross-attention module performs feature enhancement and information exchange between the same mode and different modes, and based on a registration result, a tooth neck line is further extracted and optimized. According to the method, the tooth three-dimensional digital model can be quickly and accurately registered, a high-precision tooth neck line extraction result is provided, the manpower and time cost of a medical institution can be reduced, and the medical efficiency is improved.

Methods and systems for automatic generation of a crown shape for a dentition are described wherein the method comprises segmenting 3D maxillofacial data comprising the dentition, preferably by one or more trained deep neural networks, into a set of 3D dental objects; determining or receiving a position of a tooth, preferably based on a tooth classifier, in the dentition for which a target crown shape is to be determined; determining 3D spatial constraints for the target crown shape based on the set of 3D dental objects; determining an initial pose based for the target crown shape based on one or more 3D dental objects of the set of 3D dental objects; and, optimizing one or more optimization parameters associated with a digital crown shape model to determine the target crown shape, the optimizing including determining a trial crown shape using the digital crown shape model and the one or more optimization parameters, computing a loss value for the trial crown shape based on the 3D spatial constraints and the initial pose; and, if the loss value does not meet one or more optimization conditions modifying the one or more optimization parameters to determine a further trial crown shape and to compute a further loss value.

The invention discloses a three-dimensional clinical research method of deciduous tooth anchorage on maxilla hypoplasia under the guidance of an HPC line. According to the invention, the deciduous tooth anchorage technology guided by the HPC line breaks through the limitation of the traditional tooth support type and bone support type correction, and creates a third anchorage selection mode for osteomalocclusion. By accurately positioning the central axis of the deciduous tooth crown as a supporting point, the technology not only retains the effectiveness of the traditional method on the transverse expansion of the maxilla, but also remarkably reduces the side effects of mesial inclination, vertical lifting and the like of the permanent tooth, and realizes the dual purposes of bony reconstruction and dentition stabilization. The innovativeness is that the physiological characteristics of deciduous teeth are combined with the biomechanical principle, the technical scheme is provided for the first time in China, the blank of correction of complex malocclusion in mixed dentition is filled, and a safer and more efficient treatment path is provided for clinic.

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 utility model provides a tooth model kit and a multi-layer root canal therapy practice model. A hard tissue part of a teaching tooth model is made of a colorless transparent printing material, and a soft tissue part of the teaching tooth model is made of a colored printing material. The hard tissue part of the endodontotomy practice model is made of a non-transparent 3D printing material, and the dental pulp part is made of a colored printing material with the color different from that of the hard tissue part. The dental crown part of the root canal therapy practice model is made of a non-transparent printing material, the dental root part is made of a colorless transparent printing material, and the dental pulp part is made of a colorless transparent adhesive body ground printing material. A dental crown part of the multi-layer root canal therapy practice model is made of a non-transparent printing material, a tooth root part is made of a colorless transparent printing material, a semitransparent colored layer with a preset thickness is arranged at the position, close to a dental pulp part, of the tooth root part, and the dental pulp part is made of a colorless transparent adhesive body ground printing material. The tooth model kit provided by the utility model is higher in simulation degree on teeth, and the simulation result is displayed more clearly.

The invention discloses a high-precision and automatic dental crown generation method. The method comprises seven steps of oral cavity three-dimensional data acquisition, full-mouth tooth semantic segmentation, upper and lower jaw point cloud precise registration, abutment and associated gingiva precise segmentation and trimming, abutment surrounding environment multi-tissue segmentation, neck-edge line secondary precise detection, and dental crown generation and multi-dimensional refinement. The method comprises the steps of oral cavity three-dimensional data acquisition, full-mouth tooth semantic segmentation, upper and lower jaw point cloud precise registration, abutment and associated gingiva precise segmentation and trimming, abutment surrounding environment multi-tissue segmentation, neck-edge line secondary precise detection and dental crown generation. Through combination of deep learning and a point cloud algorithm, high-precision segmentation of teeth and gingiva and precise reduction of an occlusion relationship are realized, an oral anatomical feature library and a clinical repair standard are fused, and through multi-dimensional fine adjustment optimization, a dental crown 3D model which is high in fitting degree, harmonious in occlusion and capable of meeting clinical requirements is generated. The method is full-process automatic, greatly improves efficiency, reduces operation threshold, reduces material waste and diagnosis and treatment cost, remarkably improves repair success rate, and is suitable for various oral repair scenes.

Mandibular repositioning devices have a maxillary piece with a right side backmost teeth mold and / or left side backmost teeth mold and a driver flange having an anterior side with a convex curvature protruding from one or both thereof. The devices have a mandibular piece with a protrusive flange extending cranially therefrom positioned to have a posterior side engaged with the anterior side of each driver flange and with a plateau of a preselected height between the base of the protrusive flange and the tooth covering. The posterior side of each protrusive flange has a concave-to-convex curvature from a base of the protrusive flange toward a most cranial point of the protrusive flange and a convex portion of the concave-to convex curvature engages the convex curvature of the driver flange in a rest position. The plateau prevents disconnect between each protrusive flange and a respective driver flange.

The invention relates to an occlusion guide plate designing and manufacturing method based on dentition mechanical analysis, which comprises the following steps: S1, acquiring oral cavity image data of a patient, and constructing a three-dimensional digital model comprising a dental crown, a tooth root and an alveolar bone structure; s2, calculating an overall mechanical reference point of a tooth root structure of an anterior maxillary tooth area; s3, acquiring an incisal edge midpoint of each incisal tooth and a cusp point of each canine tooth in the maxillary anterior tooth area, solving a geometric center, and connecting the geometric center with an overall mechanical reference point to form a dentition direction vector; s4, calculating the displacement relationship between the target dentition arrangement and the initial dentition arrangement in the lip-tongue direction; s5, calculating an included angle between the occlusal force direction of the maxillary anterior tooth area and the dentition direction vector; s6, determining key morphological parameters of the occlusion guide plate according to the calculation result of the included angle in S5; and S7, manufacturing the occlusion guide plate. Compared with the prior art, the method has the advantages of precise mechanical adaptation, quantitative treatment prediction, personalized design and the like.

A method for generating a virtual model of an object in a patient's anatomy. The method employs a surface scan of an anatomical region of the patient's oral cavity and a volumetric density scan of the anatomical region. The method includes receiving a first dataset of labeled surface scan segments, receiving a second dataset of labeled volumetric density scan segments, cross-mounting in a coordinate system, labeled surface scan segments from the first dataset to labeled volumetric density scan segments from the second dataset, receiving identification of the targeted extraction object, identifying the 3D volumetric density model and the 3D surface model associated with the volumetric density scan segment label, and generating a third dataset comprising and 3D model of a socket, a 3D model of portions of a tooth crown, a 3D model of portions of a target extraction tooth, and / or a 3D model of the extraction contour.

Methods and systems for automatic generation of a crown shape for a dentition are described wherein the method comprises segmenting 3D maxillofacial data comprising the dentition, preferably by one or more trained deep neural networks, into a set of 3D dental objects; determining or receiving a position of a tooth, preferably based on a tooth classifier, in the dentition for which a target crown shape is to be determined; determining 3D spatial constraints for the target crown shape based on the set of 3D dental objects; determining an initial pose based for the target crown shape based on one or more 3D dental objects of the set of 3D dental objects; and, optimizing one or more optimization parameters associated with a digital crown shape model to determine the target crown shape, the optimizing including determining a trial crown shape using the digital crown shape model and the one or more optimization parameters, computing a loss value for the trial crown shape based on the 3D spatial constraints and the initial pose; and, if the loss value does not meet one or more optimization conditions modifying the one or more optimization parameters to determine a further trial crown shape and to compute a further loss value.

The invention provides a three-dimensional gingival mesh model generation method, medium and equipment, and the method comprises the steps: obtaining edge points of a three-dimensional dental crown model, projecting the edge points of the three-dimensional dental crown model for a first preset distance in a specified upper and lower jaw direction, and then carrying out polynomial fitting to obtain a bottom contour line of the three-dimensional gingival mesh model; obtaining a gingival bottom grid model based on the bottom contour line; performing point interpolation between the edge points and the points on the projected bottom contour line, and connecting the interpolated points to form a gingival side grid model; connecting the edge point of the dental crown model with the central point of the dental crown model, and constructing a gingival top grid model; and combining the gingival top mesh model, the gingival bottom mesh model and the gingival side mesh model to obtain a complete gingival mesh model. According to the scheme, the detail features of the dental crown edge points are fully considered when the gingival grid model is generated, so that generated gingival details are richer, and the precision is higher.

The utility model relates to the technical field of oral science, and discloses a dental implant component which comprises an abutment and an implant, a threaded groove is formed in the implant, the abutment is mounted in the implant and comprises a fusiform head, a middle stud and a lower stud, a dental crown is arranged at the middle upper part of the fusiform head, the middle stud is screwed at the upper part of the threaded groove, and the lower stud is screwed at the lower part of the threaded groove. The lower stud is screwed in the threaded groove through an elastic bushing, the elastic bushing is hollow, an internal thread matched with the lower stud is arranged on the inner surface of the elastic bushing, an external thread matched with the threaded groove is arranged on the outer surface of the elastic bushing, and the length of the lower stud is 3-6 times that of the middle stud. According to the device, the abutment screw extrudes the resin to fill the gap, and the force among the three is increased, so that the stability of the implant tooth is improved.

The invention discloses a tooth data model reconstruction method and device, electronic equipment and a storage medium. Comprises: acquiring image information of a target tooth; performing segmentation processing on the image information of the target tooth to obtain an image segmentation result of the target tooth; constructing a three-dimensional shape model of the target tooth based on an image segmentation result; performing boundary extraction on the three-dimensional shape model of the target tooth to obtain binary contour information of the target tooth; and constructing a three-dimensional mesh model of the target tooth based on the binary contour information of the target tooth. According to the scheme, the three-dimensional shape model is determined according to the image information of the target tooth, then boundary extraction is performed to obtain the accurate binary contour information of the target tooth, and the three-dimensional mesh model of the target tooth is reconstructed according to the two-dimensional contour information, so that the accuracy and rapidness of reconstructing the three-dimensional mesh model of the target tooth are improved, and the reconstruction efficiency of the three-dimensional mesh model of the target tooth is improved. And an accurate tooth three-dimensional model is provided for generation of a dental crown.

The utility model relates to an artificial dental implant in a planting area with insufficient bone height, which is integrally mounted in an alveolar bone planting hole and comprises an anchor bearing and a connecting column, the upper end of the connecting column is connected with an abutment for mounting a dental crown, and the lower end of the connecting column is vertically fixed at the top of the anchor bearing; the anchor seat sinks into the bottom of the alveolar bone implanting hole, the plane area of the anchor seat is increased compared with that of the connecting column, the anchor seat is provided with a plane bottom surface, the bottom surface is in contact with the bottom wall surface of the alveolar bone implanting hole, and the side surface of the anchor seat is tightly attached to the side wall of the alveolar bone implanting hole; and the space of the alveolar bone implanting hole at the side part of the connecting column is filled with autologous bone powder. The implant has the advantages that 1) the thinner connecting column is matched with the larger anchor seat to form a countersunk head anchor, and the implant is anchored in an alveolar bone by utilizing biological growth, so that the effect of enough stability can be achieved although the embedding depth is low, and the trauma risk of a nerve tube in an operation is solved; and 2) the bottom of the implant provided by the utility model is of a flat bottom structure, so that the occlusion stress is effectively dispersed, and the use risk is solved.

A receptacle assembly configured to accommodate a bag includes a ring or a lid, and a bin or a crown including at least one wall defining an interior space, a mouth in communication with the interior space, and a rim proximate to the mouth. The rim includes at least one lip and at least one structure. At least a portion of the structure is at an elevation below the at least one lip. When the receptacle assembly is assembled, a rim-space is defined between the at least one wall and a peripheral portion of the receptacle assembly, and the structure extends into the rim-space. The peripheral portion of the receptacle assembly includes a peripheral portion of the ring or the lid. The rim-space is configured to accommodate an edge and a border of the bag.

A socket preparation tool configured to facilitate autotransplantation of a donor tooth to a recipient site is provided. The socket preparation tool includes a tooth replica of the donor tooth. A coronal portion is optionally included for facilitating alignment of the tooth replica adjacent teeth during a simulated autotransplantation. A radicular portion includes a smooth surface configured to facilitate compression of soft bone or soft tissue of the tooth replica or a contoured surface adapted for filing or cutting bone of the tooth replica. A cylindrical attachment is configured to be coupled to the tooth replica, such as via a receiver. A method of guided autotransplantation of a donor tooth via the customized socket preparation tool includes at least fitting and adjusting the socket preparation tool coupled to the tooth replica in the recipient site, before extracting the donor tooth.

A system can be configured to record a position and orientation of a dental component. The system can include a coping and a replica. The coping can include an anti / rotational feature that is configured to mate with an anti-rotational feature of a dental component. The coping can also include an orientation feature that is configured to convey the orientation of the dental component. The replica can include a first anti-rotational feature that corresponds to the anti-rotational feature of the dental component. The replica can also include a second anti-rotational feature that does not correspond to the anti-rotational feature of the dental component.

Disclosed herein is a curable composition that can contain a high crosslinker content and cure to form a tough and color neutral material that can be effectively used for a wide range of dental applications. In various embodiments, the compositions and / or polymers resulting therefrom may be used in dental appliances, including, but not limited to, orthodontics, accessory placement devices, incremental palate dilaters, dentures, crowns, and the like.

The invention discloses a method for post-root canal therapy resin closure retreatment in a medullary cavity, and relates to the technical field of root canal therapy, and the method comprises the following steps: S1, pre-operation sampling; s2, removing the restoration and other materials: removing the restoration on the surface of the dental crown and the resin sealing material in the medullary cavity by using a material removal technology and a tool, wherein the material removal technology and the tool comprise a grinding device with a sensor or a laser technology; s3, re-cleaning and disinfecting the root canal: after cleaning the root canal, using a root canal disinfection drug added with nano-silver particles, and mixing the nano-silver particles with traditional disinfection drugs such as calcium hydroxide paste; s4, filling and re-treating: blending the color of the resin by using a computer color matching technology before filling the medullary cavity; the system further comprises an intelligent design monitoring platform. According to the invention, a grinding device with a sensor or a laser technology is adopted, so that the damage to tooth tissues, especially key parts, is remarkably reduced, and the treatment safety and accuracy are improved.

The present invention discloses a biomimetic enamel composite material, which is a composite of ceramic hydroxyapatite nanowires and a polymer organic polymer assembled in an oriented manner; the biomimetic enamel composite material has a multi-level, multi-scale, and multi-component overall orientation structure; the hardness of the biomimetic enamel composite material is 2.5 - 5.5 GPa, the modulus is 40 - 60 GPa, the viscoelastic loss factor is tanδ = 0.03 - 0.04, and the viscoelastic quality factor is 1.5 - 2.5. The biomimetic enamel composite material is used as an upper restoration material for oral medical implants and is used for the integrated preparation of oral implant abutments and crowns. The present invention also discloses a preparation method of the biomimetic enamel composite material. The present invention has broad application prospects in clinical dental crowns, upper healing abutments of oral implants, repair abutments, and abutment integrated crowns in oral medicine.

A dental matrix for forming a crown on a tooth includes a body having a expandable tab, which allows the diameter of an opening to be expanded for removal of the matrix from the formed crown.

The invention discloses a dual-stage CBCT and oral scanning tooth registration method and system, and relates to the field of tooth three-dimensional digital model registration, and the method comprises the following steps: extracting a tooth voxel structure in a CBCT image and a dental crown grid structure in an oral scanning image through a segmentation network; a coarse-to-fine depth registration network is introduced, geometric feature coding and feature matching are carried out on super-points obtained through multi-resolution down-sampling, local matching is carried out on a dense point set in a super-point neighborhood, a rigid transformation matrix is calculated in parallel, and an optimal registration result is screened out from the rigid transformation matrix; and dividing a registration object into a plurality of three-tooth groups containing three adjacent teeth, and performing local iteration alignment based on an initial registration result. The method still has higher robustness and accuracy under the complex conditions of large cross-modal difference, high input point cloud density and the like, is shorter in time consumption, and provides reliable data basis and automatic support for clinical scenes such as orthodontics and implantation.

The invention is applied to the technical field of oral implant bridges, and particularly discloses a bionic oral implant bridge which comprises a lower abutment, the lower abutment is of an arc-shaped structure and is supported by a carbon fiber reinforced resin matrix composite, an upper abutment is fixedly embedded in the upper surface of the lower abutment, and a lower abutment is fixedly embedded in the lower surface of the upper abutment. The upper abutment is of a blocky structure made of a carbon fiber reinforced resin-based composite material. According to the bionic oral implant bridge, a multi-layer bionic structure composed of the inner supporting layer, the middle filling layer and the outer functional layer is arranged in the outer connecting part connected with the dental crown, the inner supporting layer is composed of the inner supporting part made of metal titanium and the arc-shaped protruding blocks, and the structural strength of the outer connecting part is improved through the inner supporting part; local stress during chewing can be dispersed through the annular distribution design of the protruding blocks made of the titanium material, single-point stress overload of the inner supporting part is avoided, the middle filling layer is made of polymethyl methacrylate, meshing impact force is buffered, and damage to the structure caused by direct transmission of hard force is reduced.

Embodiments of the present invention provide a method, system, devices and software which provide customized, clinically relevant designs, e.g. treatment plans / solutions for at least single tooth replacement therapy in real-time as needed to enable immediate confirmation of the validity and execution of patient-specific treatment solutions.A Machine Learning algorithm is used in a method or system for computer implementation of automatic restoration design. The restoration design includes the design of restorative elements such as crowns and abutments. Software is provided for carrying out the methods when executed on a digital processor. Manufacturing of the restorative elements is also included.

Dental crowns having securing protrusions, methods of preparing said dental crowns, and methods of repairing a tooth with said dental crowns are described.

The invention discloses an orthodontic micro-implant nail implanting method, device and system and a storage medium. The method comprises the following steps: S1, acquiring CBCT three-dimensional data; and S2, analyzing CBCT three-dimensional data through AI artificial intelligence to calculate an optimal implantation site and an implantation direction path, and designing an implantation guide plate mounted on the surface of the dental crown. By the adoption of the technical scheme, the success rate of implanting the micro-implant nail is increased, relevant soft and hard tissue indexes in the CBCT three-dimensional image are integrated, and the burden and judgment errors of an orthodontic doctor in measurement and positioning are reduced.

The invention discloses a sparse view dental crown three-dimensional reconstruction method, which comprises the following steps: S1, data preprocessing: segmenting data through an SAM model and obtaining a mask image, and removing outliers and noise by using an Otsu algorithm to obtain a dental crown photo; s2, initializing 3D information of the dental crown, estimating a camera attitude under a sparse view angle, generating a corresponding new view, a normal map and a depth map by means of a conditional view angle diffusion model, providing a necessary data basis for the 3D information of the dental crown, and constructing a preliminary 3D contour of the dental crown by using a visual shell technology and 3DGS; and S3, in a dental crown 3D model optimization stage, a sparse view angle generation strategy is adopted to optimize a view condition diffusion model and an initial camera attitude, and meanwhile, a dental crown 3D Gaussian geometric optimization method is proposed to further refine the primarily reconstructed dental crown appearance. According to the method, the new view, the normal graph and the depth map are generated through the conditional diffusion model, so that the reconstruction quality of the 3D dental crown is remarkably improved, and the detail representation is enhanced.

The invention belongs to a tooth deformity quantification method, and provides a three-dimensional tooth jaw model deep coverage deformity quantification method and a related device aiming at the problems that a distance index measurement method for representing an upper and lower jaw coverage relation in an existing three-dimensional tooth jaw model is time-consuming, the measurement precision is difficult to guarantee, and the method excessively depends on subjective judgment of a doctor. Sequentially obtaining a projection point set in the occlusal surface direction of the tooth area, a central point of the projection point set in the occlusal surface direction of each tooth area and a global central point of the tooth model, then calculating a rotation amount based on the data, performing quaternion transformation, obtaining an identification line capable of representing a crest cutting position of each tooth crown, fitting the identification line of each tooth crown, and obtaining a crest cutting position of each tooth crown; the method comprises the following steps: obtaining two tooth crest cutting distribution curves, performing alignment processing on the two tooth crest cutting distribution curves, obtaining a matching point set through resampling, and obtaining a tooth jaw covering horizontal spacing according to the matching point set. The problem of precision loss in a traditional transformation method is effectively avoided, and the precision of tooth pose adjustment is ensured.

The invention provides a method and a system for tooth segmentation and tooth position identification of an intraoral digital model. The method comprises the following steps: acquiring an intraoral three-dimensional model; generating a two-dimensional occlusion view perpendicular to an occlusion plane based on the intraoral three-dimensional model; segmenting the teeth in the two-dimensional occlusion view through an SAM model to obtain an occlusion segmentation mask; performing regression on a dental arch curve according to the occlusion segmentation mask; generating a plurality of two-dimensional dental crown views along the dental arch curve based on the intraoral three-dimensional model; segmenting teeth in each two-dimensional dental crown view through an SAM model to obtain a plurality of dental crown segmentation masks; and obtaining a segmentation result on the intraoral three-dimensional model based on the occlusion segmentation mask and the plurality of dental crown segmentation masks.

The invention discloses a standardized three-dimensional periodontal attachment quantification system and method, and relates to the technical field of digital oral medicine, and the method comprises the following steps: calibrating a cementum-enamel boundary, dividing a tooth model into a dental crown and a tooth root, and determining the total surface area of the tooth root; performing sensitivity analysis by using the candidate threshold sequence, and determining an optimal diagnosis threshold in combination with a surface integrity criterion; based on the optimal diagnostic threshold, an absolute adhesion area and a relative adhesion area ratio are calculated and output. The invention provides a quantitative method capable of truly, comprehensively and accurately reflecting the three-dimensional pathological change of the periodontal tissue, and the accuracy of a measurement result is ensured through standardized crown root segmentation and accurate geometric judgment; through data-driven parameter optimization, uncertainty caused by manual intervention is eradicated, and objectivity and repeatability of a measurement result are ensured.