32 results about "Root apex" patented technology

The invention relates to a digital designing and manufacturing method for an apical surgery guide plate. The method comprises the steps that 1) intraoral soft and hard tissue data of a patient is acquired through oral CBCT scanning, and a CBCT model is reconstructed in a three-dimensional mode; 2) a three-dimensional digital image of the surface information of teeth and mucosas of the patient is acquired through intraoral 3D optical scanning; 3) the CBCT model is combined with a three-dimensional optical scanning model to accurately reconstruct a target tissue; 4) 3D model design is carried out on the apical surgery guide plate by applying reverse engineering software; and 5) the guide plate is manufactured according to a 3D apical surgery guide plate model through 3D printing. According to the method, the CBCT three-dimensional image and intraoral 3D scanning are combined, the cut length, angle and depth of a root apex and the range of the root apex lesion are accurately positioned through the computer-aided design, the apical surgery guide plate is manufactured through 3D printing, and therefore the surgery can be accurately controlled, the surgical risk can be reduced, in addition, the operation difficulty can be lowered to the maximum extent, and the operation efficiency can be improved.

Root apex position model data associated with electrical characteristic values between a measurement electrode and a mouth electrode in a state in which the distal end of the measurement electrode is located at a root apex position of a root canal is stored in a storage unit. A power supply applies measurement signals of 500 Hz and 2 kHz between the measurement electrode and the mouth electrode. Two different current values flowing between the measurement electrode and the mouth electrode are detected. These current values are compared with the root apex position mode data stored in the storage unit. If the root apex position data includes any data which coincides with the current values, it is detected that the distal end of the measurement electrode is located at the root apex position.

The invention discloses a Chinese medicinal decoction for treating toothache. The Chinese medicinal decoction is prepared from the following bulk pharmaceuticals in parts by weight: 10-15 parts of coptis root, 25-35 parts of realgar, 7-12 parts of baikal skullcap root, 10-20 parts of clematis root, 10-15 parts of Chinese angelica, 10-15 parts of common anemarrhena, 7-13 parts of skunk bugbane, 15-25 parts of honeysuckle flower, 6-12 parts of medicinal cyathula root, 10-20 parts of paniculate swallowwort root, 3-8 parts of astragalus, 6-12 parts of dahurian angelica root, 6-12 parts of Chinese ligusticum rhizome and 6-12 parts of fried great burdock achene. The Chinese medicinal decoction disclosed by the invention can be used for treating toothache caused by oulonitis, root apex periarthritis, parodontopathy and the like. The Chinese medicinal decoction is taken orally twice every day, every time for about 10ml. One treatment course lasts for seven days; after one treatment course, pain is generally relieved remarkably; and after two treatment courses, pain disappears basically, and red and swollen gums disappear and are cured. After curing, the Chinese medicinal decoction can be taken continually for 1-3 treatment courses for consolidating the curative effect.

The invention relates to a hook type root apex locator which comprises a casing, a hook fixedly mounted at one end of the casing, a filing pin connected to the other end of the casing through a data line and a control panel disposed in the casing. The hook is suspended on the lip, the casing is directly suspended below the hook, and the surface of the casing is provided with a display mechanism for displaying the length of the root apex. The display mechanism, the hook and the filing pin are all electrically connected to the control panel. The hook of the root apex locator is fixedly disposedat one end of the casing. During operation, when the hook is hung on the lip, the casing is directly hung under the hook, that is, the chin of a patient, so that an operator can check data informationdisplayed by the display mechanism instantly during operation.

The invention discloses a root tip tissue culture method of Phalaenopsis aseptic culture strain, which comprises the following steps: (1) cultivating Phalaenopsis aseptic strain with finely divided Chinese fir dander, cutting off the tips of aerial roots protruding from the flower pot as explant; (2) washing the root tip of the explant with washing powder, soaking it in alcohol, soaking it in sodium hydrochloride to sterilize it, and rinsing it with sterilized water at last; (3) washing the root tip of the explant Into the culture medium for tissue culture. The method adopts the root of the aseptic cultured strain as the explant, which can effectively reduce the pollution degree of the explant, reduce the damage to the mother plant, and promote the differentiation rate and proliferation rate of the root tip tissue culture. The invention can collect root ends in any season for tissue culture, and the explants can be collected without waiting for the Phalaenopsis to bloom.

The invention relates to a tissue activity promotion type pulp capping agent and a preparation method thereof, and belongs to the technical field of pulp capping agents. Periploca forrestii Schltr isground and undergoes alcohol extraction, the obtained alcohol extract is collected and is concentrated, an ethyl acetate component is extracted from the Periploca forrestii Schltr, and the Periploca forrestii Schltr ethyl acetate part has strong osteoclast formation and bone resorption ability inhibition activity, and can improve the activity of cell tissues at the pulp capping position, so the tissue restoration condition is used is improved after the pulp capping agent. A pearl mother material is used as a powder main material, and the main components of the pearl mother powder main materialare calcium carbonate, organic matters and few trace elements, so the pulp capping agent is similar to human skeleton in chemical components and form structure, is nontoxic to local tissues or the whole body, has no rejection reaction, has good biocompatibility and bone affinity, can promote the restoration of root apex periphery tissues, guide the growth of alveolar bone cells and seal apical foramen, and has effectively improved restoration performance.

The invention relates to the field of dental equipment, in particular to a positioning device for apical surgery and a preparation method of the positioning device. In order to reduce the risk of theapical surgery, improve the treatment quality and enable the long-term prognosis to develop well, the invention provides a positioning device for the apical surgery, which is characterized in that theperipheral side surface of a supporting plate is a convex arc surface; a positioning plate is located on the top face of the supporting plate and close to the peripheral side face of the supporting plate; a positioning through groove is formed in the positioning plate and is close to or located at the positioning end, away from the supporting plate, of the positioning plate; a positioning accessory is clamped in the positioning through groove; and a positioning guide through hole penetrating through the inner wall and the outer wall of the positioning accessory is formed in the positioning accessory. During use, the supporting plate is located between upper teeth and lower teeth of a patient, the positioning accessory is abutted against affected teeth, and the positioning guide through hole is located in the excision position of the root apex of the affected teeth. By using the positioning device for the apical surgery, the surgical risk can be reduced, the treatment quality can be improved, and long-term prognosis can be well developed.

The invention relates to a preparation method for a periodontal tissue repairing-type root apex filling material and belongs to the technical field of filling materials. Bovine bone is calcined and then is compounded with tricalcium phosphate so that a base is prepared. Main fillers are hydroxyapatite and hydroxy acid calcium salt, are similar to hard tissue ingredients of the human body, can be effectively compatible with human tissues, have excellent mechanical strength in the human body and can effectively fill the root apex. The gel prepared from chitosan coats the osteogenic growth peptide and slowly releases the osteogenic growth peptide so that periodontal tissue regeneration is promoted. The chitosan gel can effectively promote the regeneration of periodontal tissues in the bifurcation area. Through the interaction between the chitosan gel and the filling material, the growth and development of periodontal tissues are promoted and the development of periodontal tissues is effectively repaired and promoted.

A gel nail for attaching to a fingernail of a user includes an elongated nail body having a root end, a tip end and two side edges, and defining an attachment portion at said root end for attaching on the fingernail and an extension portion at said tip end for being extended beyond the fingernail. A curvature at the root end is smaller than a curvature of the tip end, such that the root end is more flatten than the tip end. Each of the side edges has a reduced thickness to enable the attachment portion to be bent for matching with a curvature of the fingernail of the user.

A surgical device for identification of a surgical site of interest, such as a craniofacial or dental site (root apex of an identified tooth), and a method for using the device is provided. The device includes a perimeter bar and a plurality of intermediate cross bars arranged in a grid structure. The device can be used during a surgical procedure requiring enhanced precision, such as during an endodontic surgical procedure, by positioning the device next to a patient's tooth and capturing a CBCT image, the CBCT image being used to identify a drilling location. The device can be repositioned alongside the patient's tooth, and used to identify an accurate drilling position.

The invention provides a tooth arrangement device and a tooth arrangement kit, as well as a preparation method and application thereof. The tooth arrangement device comprises a tooth arrangement device body which is integrally molded, wherein the tooth arrangement device body comprises a lip side wall, a tongue side wall and a web, wherein an upper dental part of the lip side wall and an upper dental part of the tongue side wall protrude above the web, and form an upper dental groove with the web; a lower dental part of the lip side wall and a lower dental part of the tongue side wall protrudebelow the web, and form a lower dental groove with the web; the upper dental groove comprises an upper tooth insert arrangement part, and the lower dental groove comprises a lower tooth insert arrangement part; an acting force enabling tipping movement is generated by the upper tooth insert arrangement part and the lower tooth insert arrangement part, and the rotating center of tipping movement is the position of one third of the length of a dental root apex; and the upper tooth insert arrangement part and the lower tooth insert arrangement part are customized according to teeth of a user. The tooth arrangement device can be used before a user wears a serial transparent appliance, and a common insertion path of teeth can be obtained without changing several braces.

The invention relates to a root apex filling material which comprises the following components in mass percent: 35%-44% of natural hydroxyapatite, 35%-44% of tetracaicium phosphate of which the particle size is 0-50mu m and the mean particle size is 2-8mu m, 7%-9% of polyacrylic acid of which the mean molecular weight is 30000-50000, 1.5%-2.5% of citric acid and 1.5%-2.5% of sodium citrate. The natural hydroxyapatite, the tetracaicium phosphate, the polyacrylic acid, the citric acid and the sodium citrate are mixed, ground and sieved by a 200-mesh sieve to form the root apex filling material.The preparation method comprises the following concrete steps of: mixing, grinding and sieving the natural hydroxyapatite, the tetracaicium phosphate, the polyacrylic acid, the citric acid and the sodium citrate by a 200-mesh sieve to obtain the root apex filling powder, preserving the root apex filling powder in a dry place for later use; using ionized water, polyethylene glycol (PEG) 400 or glycerol as a liquid phase, mixing the prepared powder with the liquid phase in a mass ratio of (4-5):1, and filling into a mold to prepare the root apex filling material.

The invention relates to a method for producing a stator and a teeth stack for a stator. A method of producing a stator of a synchronous permanent magnet machine includes: a step of providing a toothstack comprising a plurality of teeth, wherein the teeth are arranged in a radial direction, forming a tooth stack as a circular structure, each of the teeth comprising a root end in a radially outward direction of the tooth stack and an inner end in a radially inward direction of the tooth stack, each two adjacent teeth forming a gap therebetween, the inner ends of the adjacent teeth being interconnected by means of a bridge; and a step of providing at least one coil in at least one gap between adjacent teeth of the tooth stack. The method further comprises: a step of arranging the tooth stack within the yoke stack such that the root ends of the teeth are in mechanical contact with the yoke stack; and a step of removing at least a portion of the bridge portion at the inner end of the tooth such that the tooth stack has a predetermined diameter in the radially inward direction. The invention also relates to a stator, a tooth lamination and a synchronous permanent magnet motor with thestator.

The invention discloses an affected tooth model for simulating a root canal barrier surgery in vitro and a construction method and application of the affected tooth model, and solves the technical problem that an existing model tooth cannot simulate an incompletely developed affected tooth accompanied by a thick single root canal in a clinical actual environment, so that the model tooth cannot be used for practicing a root canal barrier surgery model. The diseased tooth model comprises a model diseased tooth provided with a model single tube and a base provided with an embedding hole and a diseased tooth root tip model. The construction method comprises the following steps: acquiring an in-vitro diseased tooth 3D data format, a single-root-canal diseased tooth root length and apical foramen data, designing a model single-root canal, carrying out 3D printing on a model diseased tooth, matching a base, and carrying out 3D printing; by combining different diseased tooth root apex models, the practice of root apex barrier surgery or pulp blood supply reconstruction surgery is realized. The diseased tooth model capable of being used for simulating the root canal barrier surgery in vitro can be effectively provided for clinicians, the clinicians can simulate the practice operation of the root canal barrier surgery through the diseased tooth model, the clinical skills of the clinicians can be effectively improved, and more patients can be benefited.

The invention also relates to a kit for performing such a method and a device for holding prosthetic teeth.