37 results about "Permanent tooth" patented technology

A tooth moving method and appliance for securing a space for an incoming permanent tooth to arrive includes two lingual buttons to be fixed to two teeth, respectively, to spread out a space therebetween or correct a dentition therebetween. An inner wire is pivotally connected to a first lingual button at an end thereof, and a tube is loosely fitted onto the inner wire and pivotally connected to the other lingual button at an end thereof. An open coil is loosely fitted onto the tube, and a split stop is provided for adjusting the tensile force of the open coil. Thus the tensile force of the open coil is adjusted by the split stop to move at least either of the two teeth, so as to spread out the space therebetween to a desired extent.

The invention discloses a tooth modeling method based on three-dimensional model retrieval. According to the method, three-dimensional retrieval technology is utilized for searching a teeth model with a dental crown which is similar with a to-be-modeled dental crown, and modeling is finished through three-point translation conversion registration, cutting and splicing. For reducing a workload in retrieval, the invention provides a teeth type identification method based on area segmentation, wherein area segmentation is performed through analyzing dental crown characteristic differences of different types of permanent teeth. Dental crown type identification and classification are realized according to a curved surface characteristic of the dental crown, thereby performing retrieval on different types of dental crowns. The teeth modeling method has advantages of simple operation and high modeling effect.

The invention discloses stem cells for specifically expressing a programmed death receptor 1 (PD-1), and particularly relates to the stem cells from an organic cavity. The stem cells comprise but notlimited to dental pulp stem cells, gingival mesenchymal steam cells (GMSCs), periodontal ligament stem cells (PDLSCs), stem cells of apical papilla (SCAPs) and dental follicle stem cells (DFSCs) or any combination thereof, and preferably comprise stem cells from human exfoliated deciduous teeth (SHED) and/or dental pulp mesenchymal stem cells for permanent teeth (DPSC); the stem cells also includemesenchymal stem cells from other tissues, which do not express the PD-1 at first and express the PD-1 after being modified by CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats), suchas PD-1 plus bone mesenchymal stem cells (BMMSC) modified by the CRISPR. The invention further discloses an identifying and separating method for the stem cells for specifically expressing the PD-1,a method for preparing the PD-1 plus mesenchymal stem cells modified by the CRISPR as well as application of the mesenchymal stem cells for expressing the PD-1, disclosed by the invention, in tissue regeneration, pain relief and treatment of chronic pain and a series of diseases.

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 invention discloses a positioning guide plate for removing unerupted supernumerary teeth in an anterior tooth area, and a manufacturing method thereof. A mucous membrane positioning guide plate and a boning positioning piece are detachably arranged, and can be conveniently used in a matching manner, a positioning ring for guiding the route of a boning device is arranged on the inner side surface of the boning positioning piece, the inner side surface of the positioning ring is a boning guide surface, and the boning guide surface is provided with a preset boning direction and the height ofthe positioning ring for guiding the boning depth of a machine needle. By means of the device, accurate incision positioning can be conducted on the unerupted supernumerary teeth, meanwhile, through the design of the positioning guide plate, the deboning area, depth and angle are accurately guided, incision and deboning are conducted in a small range, it is avoided that important permanent teeth and normal teeth are damaged due to positioning errors, and the supernumerary teeth are smoothly exposed.

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.

The invention discloses a preparation method of a dental pulp stem cell polymer for exfoliating deciduous teeth, the dental pulp stem cell polymer prepared by the preparation method and an applicationof the dental pulp stem cell polymer in preparation of a preparation for permanent tooth reimplantation. The preparation method comprises the following steps: (1) cleaning dental pulp tissue from exfoliated deciduous teeth, (2) digesting the dental pulp tissue by collagenase I and Dispase to obtain a cell suspension, (3) adding a VC culture solution and culturing to obtain a dental pulp stem cellpolymer. The dental pulp stem cells of exfoliated deciduous teeth not only have the characteristics of mesenchymal stem cells, but also express related genes of embryonic stem cells, have higher induced differentiation capacity than the dental pulp stem cells, and have ideal effects on dental pulp regeneration and periodontal healing of completely-dislocated young permanent teeth.

The present invention discloses a transverse-flux magnetic field modulation type linear motor. The transverse-flux magnetic field modulation type linear motor comprises a primary side and a secondary side; the secondary side comprises secondary iron cores and permanent magnets; the two secondary iron cores are C-shaped and are arranged in a mirror-image manner; the permanent magnets are evenly distributed on three surfaces of the inner side of each secondary iron core; a three-surface air gap exists between the primary side and the secondary side; the primary side includes two identical primary iron cores and a connection beam which is connected with the two primary iron cores; a plurality of identical salient pole teeth are equidistantly distributed on each of the upper surfaces and lower surfaces of the primary iron cores and opposite surfaces of the connection beam; equidistant dummy teeth are formed in ends of the salient pole teeth which are adjacent to the air gap; the width of the dummy teeth is equal to the width of dummy slots between the dummy teeth; the salient pole teeth are wound with armature windings; three phases of the primary side are wound with three-phase armature windings respectively; and the number of the dummy teeth is equal to the sum of the number of the pole-pairs of the permanent teeth and the number of the pole-pairs of the armature windings. According to the transverse-flux magnetic field modulation type linear motor of the invention, the dummy teeth can great facilitate the adjustment of a magnetic flux loop, so that useful harmonic waves are greatly improved.

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.

The invention discloses tooth-strengthening toothpaste, which is prepared by mixing 10 to 20 weight parts of calcium carbonate, 10 to 15 weight parts of calcium bicarbonate, 1 to 2 weight parts of calcium hydrogen phosphate dihydrate salt, 20 to 30 weight parts of honeysuckle flower, 6 to 10 weight parts of horse chestnut extract liquor, 4 to 6 weight parts of citric acid, 4 to 6 weight parts of menthol crystal, 0.5 to 1 weight part of dimethyl silicone oil, 0.5 to 1.5 weight parts of sodium carbonate, 1 to 2 weight parts of spice, 0.5 to 1weight part of xylitol, 4 to 6 weight parts of cation guar gum and 30 to 40 weight parts of deionized water. The permanent tooth toothpaste has the characteristics of the conventional toothpaste in the market and has a tooth-strengthening effect.

The invention discloses a freeze-dried dental bone powder material and a preparation method thereof. The method includes the steps of: weighing permanent teeth, and conducting cleaning and disinfection on the permanent teeth; performing degerming treatment on the permanent teeth, then adding a reducing agent, performing stirring for 0.1-010h, and conducting soaking for 1-48h; filtering out the solution, and conducting rinsing to obtain a material A; subjecting the material A to degerming treatment, then performing filtering to obtain a solid, and conducting rinsing to obtain a material B; carrying out fragmentation treatment on the material B to obtain a material C; adding the material C into an acid solution, performing stirring, and then conducting soaking for 1-48h; filtering out the solution, and performing rinsing to obtain a material D; soaking the material D in an alcohol solution; and subjecting the prepared material D to freeze-drying, thus obtaining the freeze-dried dental bone powder material. The product provided by the invention has good biocompatibility, is beneficial to transportation and vascularization of nutrients and metabolites, and is in favor of induction of osteogenic factors and bone tissue construction, and synchronous growth with autologous bone.

The invention relates to a preparation method and application of a dental pulp and dentin complex. The preparation method of the dental pulp and dentin complex comprises the following steps of: primary culture and subculture of dental pulp cells; preparing a liquid-phase concentrated growth factor; and mixing the cultured dental pulp cells with the liquid-phase concentrated growth factor to obtain a mixed material. Therefore, the dental pulp and dentin complex structure is prepared, and regeneration of dental pulp tissue is effectively promoted. According to the preparation method and application of the dental pulp and dentin complex of the invention, the autologous dental pulp cells and liquid-phase concentrated growth factor are mixed to be used as a young permanent tooth pulp tissue engineering scaffold, so that continuous growth of tooth roots can be promoted, and pains of patients can be relieved; the non-immune material is taken, the ectopic dental pulp-like tissue can be generated by transplantation of the dental pulp stem cells, the quantity of transplanted cells can be controlled, cell subgroups with the best potential effect on regeneration of the dental pulp and dentin complex can be screened, dental pulp regeneration is promoted, and dental pulp activity is recovered; and the liquid-phase growth factor can accelerate the wound healing process, and tissue regeneration is facilitated by stimulating cell proliferation and differentiation and promoting stem cell migration.

A finger nested toothbrush comprises bristles, a brush body and a hanging lug, wherein the bristles are fixed on the brush body, the brush body is baggy, soft and resilient, one end of the brush body is opened, and the hanging lug is arranged in the opening position. During tooth brushing, the brush body is nested on a finger, toothpaste is placed on the bristles, and tooth brushing can be performed. The finger can sensitively contact the brushed position, teeth can be consistently and comfortably brushed, and pain of people who grow permanent teeth, lose teeth and suffer from toothache is reduced. The toothbrush is small in size, low in cost, ecumenical, practical, very convenient to use, store and carry and suitable for wide crowds, can be used by people of all ages, can be changed after used for a plurality of days, can be disposable, and saves raw materials.

A drug combination for curing children permanent tooth periapical periodontitis comprises coptis chinensis, radix paeoniae rubra, rhizoma anemarrhenae, calculus bovis, eucommia ulmoides, morinda officinalis, pseudo-ginseng, Chinese violet, indigo naturalis, liquorice, honeysuckle, medicinal cyathula root, cimicifugae foetidae, rhizoma smilacis glabrae, glossy privet fruit, Chinese alpine rush, radix scrophulariae, tribulus terrestris, dandelion and Cynanchum paniculatum. The drug combination is good in absorption, fast in curative effect, free of toxic and side effects, better in compatibility due to adoption of popular Chinese medicine herbs, orderly in principal and subordinate, simple in preparation, fast in effect, low in cost, capable of effectively reducing the living burden of ordinary family and having a good application prospect.

The invention discloses an electric wheel self-discharging vehicle rim speed reducer design method based on movable tooth transmission. The method comprises the following steps: (1) a transmission ratio, a tooth number, a permanent tooth reference diameter and offset parameters are determined; (2) a movable tooth transmission geometric size is calculated; (3) a structure and a geometric size are determined; (4) a movable tooth transmission permanent tooth profile adopts a positive enveloping method to design and determine a movable tooth transmission speed reducer inner tooth ring tooth profile; (5) the stress of a tooth transmission engagement piece is calculated; (6) the contact strength of a movable tooth roller and a permanent tooth profile is calculated and determined; and (7) the contact strength of the movable tooth gear and a shock wave disc is calculated and determined. The speed reducer movable tooth transmission designed by the electric wheel self-discharging vehicle rim speed reducer design method based on movable tooth transmission has such characteristics as high bearing capacity, high single-grade speed ratio, high impact resistance, high transmission efficiency and low torque fluctuation; and a rim speed reducer is lower in wear and low in failure rate.

The fixed space regainer is a resin band designed to regain space in the gap between the remaining teeth when a tooth is lost. The band has opposing concave ends that provide bonding surfaces or anchors that attach to the remaining teeth on opposite sides proximal to the gap and an elongate connecting band between the bonding surfaces. The regainer is made from a biocompatible elastic material so that the connecting band will arch when installed across the gap and exert resilient pressure against the remaining teeth proximal to the gap to regain the space lost by narrowing that occurs by loss of the tooth, thereby providing proper spacing for growth of a permanent tooth or installation of a cosmetic replacement. The regainer may be designed by the dentist in software from a digital impression and made by 3D printing or additive manufacturing.

The invention provides an interesting pen safe to use. The interesting pen safe to use structurally comprises a natural emulsion ball, an outer shell and a bionic button, wherein the natural emulsion ball is used for tooth grinding, the outer shell wraps the natural emulsion ball, the natural emulsion ball is arranged at the uppermost end of a pen body, the plastic outer shell wraps the natural emulsion ball, and the bionic button is connected to the uppermost end of the plastic outer shell. When the interesting pen is used, the natural emulsion ball is opened; when the interesting pen is not used, the plastic outer shell is closed, so that the natural emulsion ball is sealed in the plastic outer shell, and hygiene is maintained. The interesting pen is safe and simple to use; a school child can bite a pen point safely without being polluted in a period of growing permanent teeth; the outer shell is closed when the interesting pen is not used, so that the interesting pen is more hygienic; the appearance of the interesting pen is bionic, and therefore the biting of the pen point becomes more interesting.

The invention belongs to the field of petroleum drilling and in particular discloses a front-back jet polycrystalline compound mono-cone bit. The front-back jet polycrystalline compound mono-cone bit comprises a cone (1) and a bit matrix (2), wherein a main shaft (15) extended obliquely inward is arranged at the end part of the bit matrix (2), the cone (1) is arranged on the main shaft (15), a water injection hole (6) as well as a forward diagonal water hole (7) and a backward diagonal water hole (5) communicated with the water injection hole (6) are formed inside the bit matrix (2), dip direction of the forward diagonal water hole (7) is the same with the dip direction of the main shaft (15), and the dip direction of the backward diagonal water hole (5) is opposite to the dip direction of the main shaft (15); and multiple rows of sprocket holes with rotation tracks equally spaced and staggered are arranged on the cone (1), and cutting teeth (22) are arranged in the sprocket holes in an interference manner. According to the scheme of the invention, the front-back jet polycrystalline compound mono-cone bit has the advantages of stable permanent tooth brazing, large cone bearing space, more comprehensive rock breaking and the like.

The invention relates to the technical field of medical instruments, and discloses a plugging treatment and clearance retainer applied to jaw cyst of children, which solves the problems that the existing plugging treatment and clearance retainer is long in collection time, complicated to manufacture, difficult to take off and wear and difficult to cooperate with children patients, and comprises a belt ring, two sides of the belt ring are connected with connecting rings, and the connecting rings are connected with the connecting rings. By adopting a semi-finished product form, the self-ligating holder can be worn immediately after being made, the shape in a capsular cavity does not need to be collected, the self-ligating holder is fixed to an abutment tooth, the operation can be completed beside a chair, focus cleaning, retainer designing and manufacturing and retainer wearing can be completed at a time, and the self-ligating holder has the advantages of being simple in structure, convenient to use and high in practicability. The time is saved, the doctor seeing frequency is reduced, more accuracy is achieved, and the permanent tooth eruption gap is maintained while smooth cyst drainage is kept; by means of the device, a clinician can independently complete manufacturing of the retainer, cooperation of nurses and impression technicians is not needed, and manpower is also saved.