37 results about "Permanent tooth" patented technology

A method is designed to mount a removable restoration tooth on a natural tooth to be restored. The method involves the use of the standardized plastic inner crowns corresponding to the permanent teeth of a human, the standardized metal outer crowns corresponding to the plastic inner crowns, and the standardized abutment conformation devices corresponding to the plastic inner crowns. One of the devices is used as a reference in forming an abutment on the natural tooth. An abutment matrix is made to facilitate the dressing of the plastic inner crown, so as to make a metal inner crown according to the dressed plastic inner crown. The metal inner crown is mounted on the abutment. A metal outer crown corresponding to the plastic inner crown is fitted with the restoration tooth, which is mounted on the natural tooth such that the metal outer crown is fitted over the metal inner crown.

The low profile orthodontic appliance generally has a height between and generally not including 0.0190 and 0.020 inches and having a depth less than 0.026 inches, with a preferred embodiment being a height of 0.0195 inches and a depth of 0.025 inches. The slot is preferably rectangular in cross-sectional shape thus having equal length short sides and preferably equal length long sides, the long sides having straight, uninterrupted walls. The orthodontic appliance may be in the form of a bracket or tube, each for receiving a 0.019×0.025 inch archwire and each shaped for one or more upper or lower permanent teeth. The appliances may be universal, thus being of a same size on all applicable teeth or may be a bi-dimensional setup, which uses conventional 0.018 or 0.022 inch slotted brackets in combination with the slotted bracket having a height between and not including 0.0190 and 0.020 inches.

Provided herein are systems and methods for detecting the eruption state (e.g., tooth type and / or eruption status) of a target tooth. A patient's dentition may be scanned and / or segmented. A target tooth may be identified. Dental features, principal component analysis (PCA) features, and / or other features may be extracted and compared to those of other teeth, such as those obtained through automated machine learning systems. A detector can identify and / or output the eruption state of the target tooth, such as whether the target tooth is a fully erupted primary tooth, a permanent partially erupted / un-erupted tooth, or a fully erupted permanent tooth.

The invention discloses a stem cell specifically expressing programmed death receptor 1 (PD‑1), especially stem cells derived from the oral cavity, including but not limited to dental pulp stem cells, gingival stem cells (GMSCs), periodontal ligament stem cells (PDLSCs) ), dental papilla stem cells (SCAPs) and dental follicle stem cells (DFSCs) or any combination thereof, preferably including primary tooth pulp mesenchymal stem cells (SHED) and / or permanent tooth pulp mesenchymal stem cells (DPSC); Mesenchymal stem cells from other tissues that express PD-1 but have been modified by CRISPR to express PD-1, such as CRISPR-modified PD-1 + Bone marrow mesenchymal stem cells (BMMSCs). The invention also discloses a method for identifying and isolating stem cells specifically expressing programmed death receptor 1 (PD-1), and preparing CRISPR-modified PD-1 + The method of mesenchymal stem cells and the use of the mesenchymal stem cells expressing PD-1 of the present invention in tissue regeneration, pain relief, treatment of chronic pain and treatment of a series of diseases.

The invention discloses a built-in permanent magnet memory motor of a magnetic flux switching type. The permanent magnet memory motor comprises a casing, a stator, a rotor and a rotating shaft, wherein the stator is a cylinder with a through hole and is formed by a star-shaped magnetic isolation block with a center through hole and partitioned rotor iron core discs; the rotating shaft is fixedly connected in the center through hole of the magnetic isolation block; and the partitioned rotor iron core discs are shaped like a fan and are uniformly distributed at the circumference of the rotor as well as fixedly connected to the outer surface of the magnetic isolation block. The stator comprises a stator iron core, permanent magnets, three-phase armature windings and pulse windings, wherein the stator iron core comprises a stator yoke and stator teeth formed by permanent teeth and armature teeth; the permanent magnets are shaped like a tile and radially magnetized, so that magnetic leakage factors are small; the magnetization directions of the two adjacent permanent magnets are opposite; the three-phase armature windings are wound on the armature teeth; and the pulse windings are wound on the permanent magnets. According to the permanent magnet memory motor, the weak magnetic ability and the rotation speed running range of the motor can be improved; and the no-load air gap magnetic field can be adjusted. In addition, the permanent magnet memory motor disclosed by the invention is strong in mechanical reliability, thereby being suitable for high-speed running.

The invention discloses an absorbable polylactic acid film for enhancing airtightness of an absorbable root canal post of a deciduous tooth. The absorbable polylactic acid film is prepared by dissolving the following raw materials in parts by weight: 0.5-1.5 parts of polylactic acid, and 5-15 parts of solvent. The absorbable polylactic acid film and the absorbable root canal post are made of the same material, and the absorbable polylactic acid film has no influence on human dental follicle cells, deciduous periodontal ligament cells and deciduous dental pulp cells, cannot result in apoptosis of the human dental follicle cells, is nontoxic, can effectively control the effective strength of the absorbable root canal post, can recover functions and a shape of the deciduous tooth for a long time to the greatest extent, and does not influence normal replacement of deciduous permanent teeth. A preparation method of the film is simple and practicable, and can be used for manufacturing during clinical application. The film is used for residual root and residual crown repair of the deciduous tooth, a crown restoration is good in retention postoperatively, and the film meets the clinical requirement of pediatric dentistry.

An orthodontic bracket for receiving an arch wire of orthodontic patients having both primary teeth and permanent teeth, the orthodontic bracket including a pad sized to fit on one of the primary teeth, the pad extending a first distance generally in a longitudinal direction and a second distance generally in a lateral direction, the first distance being greater than the second distance. An eyelet can extend from the pad, the eyelet including an aperture defined through the eyelet, the aperture having a central axis oriented transverse to the lateral direction. The aperture can slidingly receive the arch wire. A method including bonding the pad of the orthodontic bracket to one of the primary teeth of the patient.