16 results about "Root apex" patented technology

The invention discloses a CBCT (Cone Beam Computed Tomography) image distance determination method and device for maxillary sinus and maxillary posterior teeth, a medium and a product, and relates to the field of image processing, the method comprises the following steps: acquiring CBCT images of maxillary sinus and maxillary posterior teeth; according to the CBCT images of the maxillary sinus and the maxillary posterior teeth, performing three-dimensional segmentation of the maxillary sinus and the maxillary posterior teeth by adopting a structure segmentation model; the structure segmentation model is constructed based on a deep learning network; according to a three-dimensional segmentation result, generating a surface mesh model based on a marching cube algorithm; determining point cloud data based on a point cloud generation algorithm according to the surface mesh model; according to the point cloud data, the nearest distance between the maxillary sinus and the maxillary posterior teeth and the corresponding nearest apical point of the maxillary posterior teeth are determined; and determining the position relationship between the maxillary sinus and the maxillary posterior teeth according to the nearest distance, and classifying the position relationship. The distance between the maxillary sinus and the maxillary posterior tooth can be efficiently and accurately measured, and the position relation can be judged.

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

A dental implant includes an implant body extending along a longitudinal axis between a crown end and an apical end, the implant body having a core along which a helical thread extends with at least one thread, the core being tapered towards the apical end on at least one section of the length of the dental implant. At least two tapping grooves are arranged in the thread. The grooves interrupt the thread, so that the thread includes a series of consecutive thread arcs. Each thread arc has an apical surface oriented towards the apical end of the dental implant, and a crown surface oriented towards the crown end of the dental implant. A peripheral lateral surface connects the apical surface and the crown surface of the thread arc. In at least one section of the dental implant in which the core is tapered, at least one thread arc has a radial offset.

The present invention discloses a method for measuring the distance from the root apex to the buccal and palatal bone plates of the alveolar process based on three-dimensional reconstruction, which specifically relates to the technical field of medical image measurement. The technical key points are: taking the root apex as the origin and the distance between the root apex and the first reference point as the radius to construct a first sphere, obtaining a first intersection point where the first sphere intersects with the outer surface of the mandible and has the smallest distance with the root apex, and the distance from the first intersection point to the root apex is the shortest distance from the root apex to the buccal bone plate; constructing a connecting line between the first intersection point and the root apex, and extending the connecting line toward the root apex to obtain an intersection point between the connecting line and the outer surface of the palatal alveolar bone, that is, obtaining a second reference point on the outer surface of the palatal alveolar bone corresponding to the root apex; taking the root apex as the origin and the distance between the root apex and the second reference point as the radius to construct a second sphere, obtaining a second intersection point where the second sphere intersects with the outer surface of the palatal alveolar bone and has the smallest distance with the root apex, and the distance from the second intersection point to the root apex is the shortest distance from the root apex to the palatal bone plate.

The invention belongs to the field of tooth and dental pulp, and particularly relates to a tooth and dental pulp treatment whole-process simulation tooth and jaw model which comprises an upper jaw model, an upper jaw base, an upper jaw joint, a lower jaw model, a lower jaw base, a lower jaw joint, a connecting device, a neck joint and a tail fixing device. The lower jaw model comprises a lower jaw shell, a movable fine adjustment module and extracted teeth; the lower jaw shell is filled with a gel material capable of absorbing water; the movable fine adjustment module is a detachable fine adjustment module. The device can quickly fix and replace human isolated teeth, also can restore the adjacency relation of the isolated teeth, the periodontal microenvironment and the moist conductive environment around the tooth root, can highly simulate the physiological conditions of the isolated teeth in dentition and jaw bone, is suitable for various teaching trainings such as tooth pulp disease microscopic root canal treatment, tooth restoration, microscopic root apex surgery and the like, and has a wide application prospect. And the application scene is greatly widened.

A dental treatment apparatus according to the present invention includes a drive unit that includes a micromotor, a motor driver, and the like, a controller, and a root canal length measurement circuit. The controller controls the cutting tool to be held at a head forward driven in a direction of cutting of an object to be cut. The controller also controls the cutting tool to be reverse driven in a direction reverse to forward rotation drive when the cutting tool is forward driven and the root canal length measurement circuit detects a tip end of the cutting tool reaching a reference position. The controller further carries out a fail-safe control when the cutting tool is reverse driven and the root canal length measurement circuit detects movement of the tip end of the cutting tool toward a root apex position.

A sensor comprising a whisker shaft and a follicle is provided. The shaft has a root end and a tip end and the shaft tapers from the root end to the tip end so that the root end is wider and the tip end is narrower. The root end is pivotably mounted in the follicle.

An embodiment of the present invention provides a method, a system, and a surgical robot for verifying after root apex surgery. The method for verifying after root apex surgery includes: based on the CBCT of the jawbone before surgery, establishing a preoperative planned jawbone model carrying a preoperative planned implant model, where the preoperative planned implant model is used to create a root apex surgery pore on the preoperative jawbone; placing a plug gauge in the created root apex surgery pore, and scanning the jawbone after surgery based on an intraoral scanner to establish a postoperative jawbone model carrying a postoperative plug gauge model; registering the preoperative planned jawbone model and the postoperative jawbone model to respectively determine the central axes of the preoperative planned implant model and the postoperative plug gauge model; generating a verification result for after root apex surgery based on the central axes of the preoperative planned implant model and the postoperative plug gauge model, reducing the radiation dose received by the patient and avoiding the influence of artifacts on the verification.

To provide an artificial dental root that is optimal to accelerate the reproduction of paradentium in consideration of the flow of liquid.SOLUTION: An artificial dental root (10) is in the form a circular cylinder with a crown (20) on one end and a root apex (39) on the opposite end. Provided between the crown and the root apex are two or more vertically arranged spheres (31, 32), and a boundary (38) between the spheres is formed of a smooth curved surface concave toward an axis (P) side. As a result of this, repetitive flow of blood in a bone marrow occurs easily, which accelerates formation of a periodontal membrane and reproduces and restores paradentium.SELECTED DRAWING: Figure 2

The invention relates to the technical field of tooth root apex image processing, and particularly discloses an image segmentation method and system for a tooth root apex image, and the method comprises the steps: 1, enabling the tooth root apex image to pass through a convolution initialization module, and obtaining an initial feature map; step 2, enabling the initial feature map to pass through an encoder module and a decoder module based on a Unet structure to obtain decoder features; wavelet convolution is introduced into the encoder module; and step 3, enabling the decoder features to pass through a segmentation head to obtain a segmented image. According to the method, wavelet convolution is introduced into medical image segmentation, the best effect is achieved on the root tip image segmentation task, and the multi-scale problem can be effectively solved.

The utility model discloses a kind of endodontic root canal therapy dilatation needle limiters, including handle, the upper end of the handle is fixedly connected with fixed ring, and fixed ring is fixedly connected with connecting rope on it, the lower end of the handle is fixedly connected with the body of being checked, and the upper end outside of the body of being checked is clamped with limit ring, the limit ring is fixedly connected with clamping block on it.The existence of limit ring can accurately limit the depth of the body of being checked into root canal, in the root canal treatment process, the root canal length of different teeth is different, by adjusting the position of limit ring, it can be ensured that the operation of dilatation needle in root canal is always in safe range, avoid excessive deep damage root apex tissue or beyond root canal cause unnecessary trauma, for molar and other root canal deeper teeth, limit ring can be adjusted to appropriate position, prevent dilatation needle from exceeding root apex hole in root canal preparation process, reduce the risk of occurrence of complications such as periapical periodontitis.

Systems, methods, electronic devices and computer-readable media for orthodontic appliances include: generating final positions for each of the plurality of teeth represented in an orthodontic data set, including restricting the adjustments to the initial position of each tooth to adjustments having a centre of rotation substantially about the root apex point of the respective tooth; generating a series of intermediate teeth positions between the initial positions for each of the plurality of teeth represented in the first orthodontic data and final positions for each of the plurality of teeth, the series of intermediate positions comprising at least part of a treatment plan; and generating data from which orthodontic appliances, which facilitate movement through the intermediate tooth positions, can be produced.

The present invention relates to a driving system for a dental implant. The driving system comprises a dental insertion tool (2), which comprises an insertion tool shaft (4) extending along a longitudinal axis L from a coronal end (6) to an apical end (8) and comprising, in its apical end region, a dental implant engagement section (18), which comprises a first torque applying means (20) adapted for engaging the dental implant in a torque transmitting manner, the insertion tool shaft (4) further comprising, in its coronal end region, a drive tool engagement section (10), which comprises a primary torque receiving means (12) adapted for engaging a primary drive tool in a torque transmitting manner, the insertion tool shaft (4) further comprising a break zone (32) arranged between the drive tool engagement section (10) and the dental implant engagement section (18), said break zone being designed to break upon application of a predetermined amount of torque, the insertion tool shaft (4) further comprising, between the break zone (32) and the first torque applying means (20), an auxiliary torque receiving means (36), the primary torque receiving means (12) and the auxiliary torque receiving means (36) each having a cross-section in a plane perpendicular to the longitudinal axis L, the cross-sections being different to one another in shape and / or in size. The driving system further comprises an auxiliary drive tool (52), which comprises a drive tool shaft (54) extending along a longitudinal axis L' from a proximal end (56) to a distal end (58) and comprising, in its distal end region, a second torque applying means (60) adapted to engage with the auxiliary torque receiving means (36) of the insertion tool (2) in a torque transmitting manner but not the primary torque receiving means (12) of the insertion tool (2). In its proximal end region, the drive tool shaft (54) further comprises a uni-directional drive means (70) which enables torque to be transmitted to the auxiliary drive tool (52) in a single rotational direction.

The invention discloses a dental implant for protecting an alveolar bone of an abutment tooth, and relates to the technical field of dental implants. The dental implant for protecting the alveolar bone of the abutment comprises an implant module, an abutment module, a silica gel damping ring module and a buffer mechanism, the implant module comprises an implant main body, the outer surface of the implant main body is provided with a double-gradual-change thread part, the outer surface of the double-gradual-change thread part is provided with a cutting groove, and the cutting groove is communicated with the abutment module. The double-gradual-change thread part comprises interface end thread teeth, middle thread teeth and root end thread teeth, a conical hole, a connecting hole, a thread inner hole and a bottom groove are formed in the implant main body, a convex part is arranged on the upper end surface of the implant main body, the abutment module comprises an abutment supporting part, a conical part is arranged at the bottom of the abutment supporting part, and a convex part is arranged at the bottom of the abutment supporting part. According to the dental implant, the success rate and the stability of early-stage implantation are improved, the service life of the dental implant in the mouth is greatly prolonged, and the use mode in the operation process is improved.

FIELD: dentistry.SUBSTANCE: intended for practicing manual endodontic treatment skills in students to improve the effectiveness of treating diseases of the periapical tissues of teeth. A phantom simulation model of a tooth with external root resorption is used, which includes a 3D-printed model of a tooth with a root canal having a hemispherical expansion at the root apex. In this case, the phantom simulation model of the tooth is made of transparent or radiopaque photopolymer resin, has a length of 30 mm with a red-colored canal system of 15 mm in length. In this case, the transparent model of the affected tooth is intended for the initial level of manual skill, and the opaque radiopaque model of the affected tooth is intended for the process of training in endodontic root canal treatment, where quality control of treatment and filling of root canals is possible only by radiographic method. In this case, the root apex has a size of No. 80 according to ISO, and the hemispherical expansion at the root apex of the tooth model, simulating a chronic lesion of the periapical tissues of the tooth, has a diameter of 8 mm. In this case, using Blue Sky Bio software, a three-dimensional image of the affected tooth is extracted from the patient's cone-beam computed tomography (CBCT) scan in DICOM format, then, using artificial intelligence algorithms in Blender software, the model is corrected, virtually modeling a tooth with a root cyst and external resorption. After this, the model is imported into STL format, 1.9 ml of resin is collected for subsequent slicing and 3D printing, and the walls of the root canal system of the resulting model are painted red with Funtodo photopolymer resin.EFFECT: inventions, by simulating endodontic treatment training conditions that are as close as possible to real conditions, namely, an apical plug in the area of the wide apex of a tooth root during inflammatory external resorption or after apical resection, allow for the practice of existing variations of endodontic treatment, and also minimize the time costs for model production.3 cl, 14 dwg, 1 ex

The invention relates to a root tip tooth extraction device, which comprises a clamping forceps head, which is used for clamping a root tip in the oral cavity of a patient and can be used for extracting the root tip from the oral cavity; the adjusting structure is used for adjusting the angle and the extension length of the clamping forceps heads and can be used for removing the root tip at any position in the oral cavity; the clamping structure is used for controlling the clamping tong head to clamp or open; the control structure is used for controlling the clamping structure at the rear end to control the clamping tong head; wherein the number of the clamping tong heads is two, the adjusting structure is arranged at the first end of the clamping structure, the adjusting structure is movably connected with the clamping structure, the adjusting structure is provided with an insertion hole allowing the clamping tong heads to be placed in, and the clamping tong heads are arranged in the insertion hole and can move in the insertion hole. The second end of the clamping structure is fixedly connected with the control structure, and the control structure controls closing and opening of the clamping structure in a rotating mode so as to further control clamping and opening of the clamping tong head. The problem that some position cannot extend into the root tip area is solved.