92 results about "Ceramic brackets" patented technology

The invention discloses a tissue engineering bone cartilage composite bracket and an integrated photocuringable forming method thereof. The tissue engineering bone cartilage composite bracket serves as a ceramic bracket, wherein the ceramic bracket is served as a bone-repair part, and a porous structure is arranged on the surface of the ceramic bracketbone-repair part of the porous structure; and the ceramic bracket is fixed on a supporting plate of a photocuringable quick forming machine. A laser scanning path is driven through a computer aided design (CAD) model; and laser directly exposes and cures a hydrogel bracket and a pure hydrogel bracket which contain a ceramic component onto the ceramic bracket sequentially to form a three-layer composite bracket. Therefore, quick and fine preparation of a three-dimensional composite bracket of bone cartilage-like tissue histomorphometry is realized; uncontrollable structures and low efficiency because of handwork in the preparation process of a traditional composite bracket are avoided; the preparation efficiency is improved; and a calcified cartilage-like layer bracket and a hydrogel cartilage bracket with subtle structures can be bonded and compounded on the surface of the ceramic bracket by means of a rivet and a two-phase material.

The invention discloses a preparation method of ceramic slurry for air pressure extrusion type three-dimensional printing. The preparation method comprises the following steps: (11) adding biological active ceramic powder into a solvent, performing ball grinding by a planetary ball grinder for 3 to 12 hours, and obtaining slurry, wherein the solid phase content of the slurry is 35 to 55 vol%; (12) adding a water-soluble rheological additive into the slurry obtained in the step (11), performing ball grinding by the planetary ball grinder for 0.5 to 3 hours, then transferring the slurry into a material feeding barrel, performing ultrasonic oscillation and low-temperature debubbling in sequence, and obtaining the ceramic slurry for air pressure extrusion type three-dimensional printing. The invention further discloses a preparation method of a biological active ceramic bracket by adopting an air pressure extrusion type three-dimensional printing forming technology. The ceramic slurry prepared by the preparation method disclosed by the invention is high in solid phase content and good in printing performance and coagulability; the prepared biological active ceramic bracket can be connected by 100 percent, and the appearance structure and the internal size of the biological active ceramic bracket can be controlled.

An adhesive system has been developed for orthodontic ceramic brackets which minimizes tooth fracture and makes bracket removal easier and more predictable. The adhesive system makes use of current filled adhesives and a plasticizer (e.g. diethyl phthalate, xylene, etc.). Additions of plasticizer between 10 to 20 weight percent of the adhesive will decrease the adhesion in excess of 50%. This adhesive permits more patient comfort while at the same time allowing for the use of ceramic brackets.

A preparation method for calcium polyphosphate-tricalcium phosphate bone bracket comprises the steps of proportionally ball-milling and mixing calcium phosphate ceramic powder, size stabilizer methylcellulose, surfactant polyvinyl alcohol, foaming agent hydrogen peroxide and de-ionized water in order to prepare compound ceramic slurry, pouring the slurry into a mould, drying in an oven with four-step drying method, and then sintering the dried green body under high temperature in order to acquire porous calcium phosphate ceramic bracket. The big aperture of a big pore of the acquired porous calcium phosphate ceramic bracket of the invention is 200 to 600 microns, the micro-pore aperture thereof is 2 to 5 microns, the whole porosity thereof is from 60 to 90 percent and the compressive strength thereof is 0.5 to 7.0 Mpa. Furthermore, the method has low cost and high efficiency and can be applied to large-scale production.

The invention discloses a deep ultraviolet LED packaging structure and a preparation method thereof. The deep ultraviolet LED packaging structure comprises a ceramic bracket, a deep ultraviolet LED chip, quartz glass and a metal coating layer, wherein the ceramic bracket is of a bowl cup structure, and the deep ultraviolet LED chip is arranged in the ceramic bracket; the quartz glass is arranged at the upper end of the ceramic bracket, and a closed cavity is formed between the quartz glass and the ceramic bracket; and the outer surface of the closed cavity is coated with the metal coating layer and does not include the bottom surface of the closed cavity and the outer surface region, directly facing towards the inside of the closed cavity, of the quartz glass. The outer surface of the closed cavity is coated with the metal coating layer, so that the binding force and airtightness between the quartz glass and the ceramic bracket are improved, the problem that the quartz glass and the ceramic bracket are separated after the deep ultraviolet LED packaging structure works for a long time is solved, and the reliability of the deep ultraviolet LED packaging structure is improved.

An orthodontic bracket includes a bracket portion including a receiving slot extending across at least a portion of the bracket portion and configured to receive an arch wire. The bracket includes a metal mesh bonded to the ceramic bracket portion on a side of the ceramic bracket portion opposite the receiving slot. Another orthodontic bracket includes a metal core coated with a tooth-colored coating. Methods of attaching and aligning the brackets are provided as well as a tool for aligning the brackets. Inserts are also described for reinforcing the brackets and/or increasing a surface area for enhancing bonding strength.

An orthodontic highly-transparent ceramic bracket comprises a baseboard, and trough limbs, a trough slot and a ligation limb slot which are arranged on the baseboard, and the ceramic bracket is a yttrium aluminum garnet ceramic bracket, a magnesium aluminate spinel ceramic bracket or a spinel aluminum oxynitride ceramic bracket, and has a linear transmittance of above 70%. A preparation method of the highly-transparent ceramic bracket comprises the following steps: 1, slurry preparation: ball-milling raw materials with Al2O3 balls as a ball milling medium for 24-48h, wherein the raw materials comprise transparent ceramic powder, a composite sintering aid, polyacrylic acid and deionized water, the composite sintering aid accounts for 0.1-0.6% of the weight of the transparent ceramic powder, polyacrylic acid accounts for 1-5% of the weight of the transparent ceramic powder, the ratio of the total weight the transparent ceramic powder, the composite sintering aid and polyacrylic acid to the weight of deionized water is 1:4-8, and the transparent ceramic powder is yttrium aluminum garnet ceramic powder, magnesium aluminate spinel ceramic powder or spinel aluminum oxynitride ceramic powder; 2, molding and biscuit treatment; and 3, sintering.

The invention discloses a three-dimensional printing porous bredigite biological ceramic bracket, and a preparation method and application thereof. The method comprises the following steps: firstly, obtaining a sizing agent by blending bredigite powder, sintering aids and a binder aqueous solution at a certain ratio, then utilizing a three-dimensional printing technique to prepare a ceramic bracket blank with a controllable porous structure, and then sintering at high temperature, thereby obtaining a bredigite biological ceramic bracket material with a porous structure and excellent mechanical properties. The three-dimensional printing porous bredigite biological ceramic bracket prepared according to the preparation method has controllable pore diameter and porosity, high biocompatibility, excellent mechanical properties obviously better than the mechanical properties of a calcium phosphate ceramic bracket with the same structure, and excellent induced osteogenesis activity and angiogenesis activity, and is expected to be used for boosting the regeneration repairing of various defected bone tissues.

The invention discloses a beta-dicalcium silicate porous biological ceramic bracket and a preparation method and an application thereof. The preparation method of the beta-dicalcium silicate porous biological ceramic bracket comprises the following steps: adopting porous organic foam as a precursor; adding the foam precursor in ceramic slurry for impregnating and slurry hanging after treatment; drying and firying after removing spare ceramic slurry so as to manufacture the beta-dicalcium silicate porous biological ceramic bracket. The biological ceramic bracket is good in through hole property, mechanical performance and biological compatibility, and can be applied to bone tissue engineering.

The invention relates to the field of ceramic processing, in particular to a ceramic automatic glazing machine. The ceramic automatic glazing machine comprises a bottom box assembly, a lifting frame,a ceramic bracket, a fixing sliding frame and a clamping frame. When the ceramic automatic glazing machine is used, the bottom of ceramic needs to be placed at the upper end of a bottom supporting strip, and two clamping rods can clamp the upper end of the ceramic; and the ceramic automatic glazing machine can clamp the ceramic with different sizes, after being clamped, the ceramic can be driven to downwards move through a motor to enter glaze liquid to be glazed, and after glazing is completed, the ceramic can be lifted and air-dried. The lifting frame is slidably connected to the left end ofthe bottom box assembly; the lower end of the ceramic bracket is slidably connected with the lifting frame; the upper end of the ceramic bracket is matched with the lifting frame through a thread; the fixing sliding frame is fixedly connected to the lifting frame; and the clamping frame is slidably connected to the fixing sliding frame.

The invention discloses a preparation method of a combined porous biological ceramics bracket. The grads porous biological ceramics bracket with a relatively compact outer part and a porous smooth inner part is prepared by the steps of manufacturing biological ceramics spherical particles and a three dimensional shell, assembling and the like. The mean counter bending strength of the material of the shell reaches 25.4-30.7MPa. The porous biological ceramics bracket prepared by the preparation method has the characteristics of forming without depending on a mould, customizing according the difference of a patient, and rapidly producing the biological ceramics bracket.

A ceramic bracket has mesial and distal sections that are initially spaced apart from each other by an elongated channel. The bracket is debonded from a patient's tooth at the conclusion of treatment by pivoting one or both of the mesial and distal sections in an arc about a reference axis extending in a direction generally parallel to the channel. The bracket includes a recess that extends across a base of the bracket in generally parallel relationship to the channel. The base of the bracket has an aspect ratio that is less than about 0.95 and enables the bracket to be debonded with less force than might otherwise be necessary.

The invention discloses a method for manufacturing a personalized ceramic bracket appliance, which comprises the following steps: scanning to obtain the appearance data of the tooth surface of a patient; using a three-dimensional auxiliary design software to obtain a bracket appliance bottom plate attached to the tooth surface to be bonded and a body digital model designed according to the orthodontic treatment requirement; additionally arranging a casting channel after being integrated into a complete bracket appliance model; obtaining a bracket appliance resin wax pattern by using a 3D printing technology; using a casting ceramic material which is consistent with or close to the tooth color of the patient as a raw material; preparing a bracket appliance blank by using an embedding hot die casting technology and deembedding; obtaining the bracket appliance to be bonded after polishing and glazing. The ceramic bracket appliance has the advantages that the manufacturing period is greatly shortened, the tooth surface appearance and the tooth color of different patients can be different, the bracket appliance bottom plate which is perfectly attached to the tooth surface to be bonded and the semitransparent bracket appliance whole body which is consistent with or close to the tooth color of the tooth surface to be bonded are manufactured, the accuracy of bonding positioning is improved through indirect bonding, the personalized reticulated bottom plate also improves the bonding strength of the bracket, so that the effect of invisible orthodontic treatment is achieved, and the personalized customization requirement in clinical treatment is more met.

The invention discloses a crystal-coated COB (chip on board) light source with high luminous efficiency for a streetlamp and a production process for the crystal-coated COB light source. The COB light source comprises a red copper heat dissipation base plate, a lens, an aluminum oxide ceramic bracket and an inverted chip, wherein the inverted chip coats a solid crystal region of the aluminum oxide ceramic bracket through a eutectic furnace under the protection of a hydrogen gas atmosphere; the aluminum oxide ceramic bracket is fixed on a sunken table of the read copper heat dissipation base plate by adopting a reflux welding mode; the lens comprises an extending side part which is upwards turned over and an upwards bumped lens part in the shape of an oval hemispheric peanut; the lens is fixed on the red copper heat dissipation base plate through glue with high light transmittance, and the lens and the red copper heat dissipation base plate are enclosed to form a cavity; the aluminum oxide ceramic bracket which is coated with the inverted chip is fixed in the cavity, and a groove is positioned above a fluorescent powder region of the aluminum oxide ceramic bracket; and a gold-tin alloy with high heat conduction coats the bottom of the inverted chip. The production process for the crystal-coated COB light source with high luminous efficiency for the streetlamp is advanced and high in production efficiency; the obtained product has the advantages of high luminous efficiency, high light transmittance, good light gathering property, excellent heat dissipation, and the like.

The invention relates to an energy storage element, in particular to a heat energy storage element which makes use of electric heating to store energy for a solid. The heat energy storage element comprises a shell, wherein a heating pipe is arranged in the shell, the two ends of the heating pipe are fixed on end covers at the two ends of the shell, the middle parts of the end covers at the two ends of the shell are provided with ceramic insulating stools, the centers of the ceramic insulating stools are provided with electrodes which are connected with the heating pipe, a ceramic bracket is arranged in the shell and is sleeved on the heating pipe, and a solid heat storage body is arranged in a hollow cavity formed by the shell, the ceramic bracket and the heating pipe. The heat energy storage element has the advantages that the volume of the energy storage element can be adjusted according to the capacity of the stored energy, or a plurality of energy storage elements are overlapped; and the maintainability of a single energy storage element is good, the group number of the heat storage capacity can be adjusted at random, and the solid heat storage body can improve the heating temperature to change more electric energy into heat energy to be stored.

The invention discloses a biological active ceramic bracket with a nano/micron hierarchical pore structure and a preparation method of the biological active ceramic bracket. The preparation method includes the following steps that (1) monodisperse microspheres with the particle size height capable of being controlled are prepared through a soap-free emulsion method; (2) the microspheres are evenlydispersed in ceramic paste, and the ceramic paste with good printability is obtained; (3) the biological active ceramic bracket with the micron order pore size is printed through a 3D printing technology; (4) the printed bracket is sintered, and the biological active ceramic bracket with the nano/micron hierarchical pore structure is obtained. According to the biological active ceramic bracket with the nano/micron hierarchical pore structure and the preparation method of the biological active ceramic bracket, pore-formingtemplates with the particle size capable of being controlled are evenlydispersed in the printing paste, the sintering characteristics of ceramic and the characteristics of precise control of the micropore structure through the 3D printing technology, the biological active ceramic bracket with the nano/micron hierarchical pore structure is successfully and precisely constructed, and the difficult problem that existing 3D printing technologies cannot accurately controlthe nanoscale pore structure is solved.

Coordinated metal and ceramic orthodontic bracket systems (100) allow a practitioner to insert one or more ceramic brackets (102, 104, 106, 108) into a metal bracket system (1001), replacing selected metal brackets (102′, 1041, 106′, 108′) with ceramic brackets (102, 104, 106, 108), and vice-versa. Thus, both a ceramic bracket system (100) and a metal bracket system (1001) are provided, in which corresponding brackets of each system include substantially identical “in-out” slot floor cross-sectional thicknesses so that corresponding brackets are interchangeable with each other, without any need for compensating bends or later treatment to correct unintended buccal-lingual tooth movement.

The invention discloses a polishing grinding machine for an LED ceramic bracket. The polishing grinding machine comprises a rack, a workpiece conveying device, a polishing grinding device and a PLC controller. The workpiece conveying device comprises a conveying belt, a conveying roll shaft and a motor. A locating roll shaft is arranged above the conveying belt. The polishing grinding device comprises a vertical pedestal, a drive wheel, a driven wheel, and an abrasive belt. The conveying belt is provided with a pressure sensor. The driven wheel is provided with a lifting drive structure. Moreover, the abrasive belt is provided with an offset sensing switch for sensing a positional deviation of the abrasive belt and a correcting mechanism for pushing and correcting an abrasive belt winding position. The PLC controller is respectively connected with the motor, the pressure sensor, the lifting drive mechanism, the offset sensing switch and the correcting mechanism. The automation degree and the intelligent degree of the polishing grinding machine are increased greatly by automatically sensing a contact pressure between the abrasive belt and a workpiece, automatically sensing the winding position of the abrasive belt, and automatically regulating the contact pressure and the winding position in real time based on the actual conditions, accordingly increasing the machining efficiency and guaranteeing the polishing grinding quality better.

The invention relates to a friction experiment table for initiatively regulating and controlling the thickness of a lubricating film between a friction pair, belonging to the technical field of mechanical friction. In the experiment table, a glass disc is fixed at the upper end part of a rotating shaft by a fixing screw and is connected with the rotating shaft; a hinge is arranged on a lubricating experiment table and a lever penetrates through the hinge; an oil cup is arranged at one end of the lever and a weight is hung at the other end of the lever; a steel ball is arranged between the upper surface of the oil cup and the lower surface of the lubricating experiment table; the lower part of a piezoelectric ceramic rod is fixed on a piezoelectric ceramic bracket by fastening screws; a fine tuning spiral rod is arranged at the lower part of the piezoelectric ceramic bracket; and the lower end part of the piezoelectric ceramic rod is connected with a piezoelectric ceramic controller by a signal wire. According to the friction experiment table, the gap between the steel ball and a glass disc point contact pair can be roughly adjusted; and the displacement generated by piezoelectric ceramic is further reduced at the near end of the lever by a lever principle, so that the gap between the ball and the disc point contact pair is accurately controlled.

The invention discloses a CAD and CAM personalized substrate sandwich ceramic bracket, which can increase the fit between the ceramic bracket as well as a tongue side bracket and the dental face, so the binding strength of the bracket and the dental face is increased. The CAD and CAM personalized substrate sandwich ceramic bracket consists of a personalized bracket base (1) which is matched with a finished ceramic bracket and completely jointed with the lip face or tongue face of a tooth body and the bottom face of the finished ceramic bracket, a binder (2) and the finished ceramic bracket (3), wherein the thickness of the substrate is 0.4 to 0.6 centimeters; the ceramic binder (2) binds the personalized bracket base (1) and the finished ceramic bracket (3) into a whole; and the thickness of the ceramic binder (2) is kept between 30 and 50 micrometers.

The invention discloses a ceramic bracket semi-finished product finish machining and polishing tool. The ceramic bracket semi-finished product finish machining and polishing tool comprises a box body,a working cavity with a forward opening is formed in the box body, a tray body and a supporting body are arranged in the working cavity, the supporting body is located on the upper side of the tray body, a power mechanism capable of controlling the tray body to vibrate to tile brackets and control polishing of the brackets is arranged in the working cavity, the power mechanism comprises two inserting cylinders which are fixedly arranged on the bottom surface of the tray body in a left-right symmetry mode, and two fixing blocks which are symmetrical left and right are fixedly arranged on the bottom wall of the working cavity. According to the ceramic bracket semi-finished product finish machining and polishing tool, the tray body is driven to vibrate in a rotary touch mode and through shaking of springs, then the brackets poured into a containing cavity can achieve the tiling effect, the contact areas between the brackets and polishing cotton when the brackets are polished are greatlyincreased, and the problem that the brackets are stacked and consequently polishing is damaged is solved.

The invention relates to a manufacturing method of a ceramic bracket for a magnetic suspension variable frequency centrifuge coil. The method includes the steps of: 1. stirring aluminium oxide, calcium oxide, niobium pentoxide, calcium carbonate and suzhou clay powder evenly according to a predetermined proportion, and conducting drying in a drying oven to a water content of less than or equal to 0.03%; 2. putting the uniformly mixed mixed powder into a ball mill to carry out ball milling to a particle size measurement value of 2.0-4.0micrometers; 3. adding white wax accounting for 8-13% of the mixed powder weight and yellow wax accounting for 0.2-0.6% of the mixed powder weight into the ball milled mixed powder to make a wax cake; 4. using a hardware mould to process the wax cake into a ceramic bracket green body for the magnetic suspension variable frequency centrifuge coil by means of hot press molding; 5. fixing the ceramic bracket green body in a sagger with adsorption powder and sending the green body into a wax removal kilin to remove wax; and 6. loading the wax removed and ash removed ceramic bracket green body into a corundum earthen bowl tidily and sending the corundum earthen bowl into a continuous sintering kiln to conduct high temperature sintering, and finally performing natural cooling, thus obtaining the ceramic bracket for the magnetic suspension variable frequency centrifuge coil.

The invention belongs to the field of biomedical materials and additive manufacturing, and relates to a biological composite ceramic bracket with controllable degradation performance and strength anda preparation method thereof. The method comprises the following steps: S1, taking hydroxyapatite powder, beta-calcium phosphate powder and micron-sized biological glass powder, wherein the total massis m; mixing different photocurable resin monomers and/or prepolymers thereof in a predetermined ratio, adding a plasticizer and a dispersant, ultrasonically mixing, adding a photoinitiator, a polymerization inhibitor, a release agent and a lubricant, and fully mixing to obtain a solvent; s2, adding the three powders into a solvent in stages, stirring, and performing vacuum ball milling to obtainprinting slurry; s3, performing DLP 3D printing and/or photocuring by using printing slurry to obtain a bioceramic biscuit; and S4, degreasing and sintering the bioceramic biscuit to obtain a finished product of the biocomposite ceramic bracket. The method can obtain composite bioceramics with excellent mechanical properties and degradation properties, and the composite bioceramics can be appliedto bone tissue engineering technology.

The embodiment of the invention discloses a chip-on-board (COB) light source of a flip chip mining lamp. The COB light source of the flip chip mining lamp comprises a cooling copper substrate, an aluminum nitride ceramic bracket and an optical glass lens, wherein the cooling copper substrate comprises a sink table structure, a through hole structure and a copper foil line; the aluminum nitride ceramic bracket comprises a bracket body which is made of aluminum nitride ceramic; a plurality of solid crystal regions are evenly arranged on one surface of the bracket body; and the optical glass lens is adhered right above a chip packaging block on the cooling copper substrate, so that the problem in a light-emitting diode (LED) light source produced by a flip chip technology is avoided; crystal fixing is realized by welding; a bonding wire is not needed; and a eutectic bracket is connected with a cooling substrate in a reflow soldering manner, so that the anti-vibration stability is very good.