9 results about "Root apex" patented technology

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.

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.

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.

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.