222322325225232323232222525334723252323232323233. The lithium silicate glass ceramic provided by the present application is low in softening temperature, and the die-casting temperature of preparing the lithium silicate glass ceramic prosthesis by employing a die-casting method is also relatively low.
C03C 10/00 - Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
C03B 32/02 - Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles
Disclosed are a dental material with transmittance and color gradients and a method of preparing the dental material. The method includes (1) preparing at least three types of composite resin material precursor powders; (2) sequentially adding the precursor powders into a mold and performing dry pressing to obtain a preform body; alternatively, (2′) dry pressing the first type of precursor powder into a first green body, wrapping the first green body with the second type of precursor powder and then performing dry pressing to obtain a second green body, and repeating the wrapping and dry pressing operations until all types of precursor powder are dry pressed to obtain a preform body; and (3) performing hot-pressing consolidation on the preform body to obtain the desired dental material.
A dual-purpose sintering furnace including a furnace body having a furnace chamber, a first furnace mouth and a second furnace mouth which are communicated with the furnace chamber, a furnace door hinged to the furnace body and configured for closing the first furnace mouth, a blocking member lap-jointed inside the furnace chamber and configured for blocking the second furnace mouth, a sample stage, an ejection rod fixedly arranged on a sample placement face of the sample stage, a lifting device configured for driving the sample stage to raise or lower, so that the ejection rod pushes the blocking member until the second furnace mouth is opened, and so that the sample stage enters the furnace chamber through the second furnace mouth. The dual-purpose sintering furnace can complete a large amount of sintering as conventional sintering and also implement rapid sintering.
A rapid sintering system and rapid sintering method, the rapid sintering system comprising: a furnace body (110) comprising a hearth (111) and a furnace mouth (112) that communicate with each other; a lifting device (120) arranged below the furnace mouth (112), comprising a support (122) and a sample stage (121), the sample stage (121) being disposed on the support (122); a temperature acquisition device (130), disposed on the sample stage (121); a control device (140), disposed outside of the hearth (111), electrically connected to the lifting device (120) and the temperature acquisition device (130) and used to control lifting of the lifting device (120) according to a temperature acquired by the temperature acquisition device (130) and a preset sintering condition; and a spacer (150), disposed at a first end of the lifting device (120), a first spacing being present between the spacer (150) and the sample stage (121), and the furnace mouth (112) is blocked by the spacer (150) when the rapid sintering system is in a loading or unloading work state. The rapid sintering method uses the rapid sintering system.
C04B 35/10 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on aluminium oxide
C04B 35/48 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on zirconium or hafnium oxides or zirconates or hafnates
F27B 17/02 - Furnaces of a kind not covered by any of groups specially designed for laboratory use
F27B 21/00 - Open or uncovered sintering apparatusOther heat-treatment apparatus of like construction
Disclosed is a sintering furnace comprising a furnace body and a lifting device, wherein the furnace body comprises a furnace chamber (10) and a furnace mouth (20), the furnace chamber (10) is connected with the furnace mouth (20), wherein the sintering furnace further comprises a sealing member (30) provided at the lifting device; when the sintering furnace is in a loading or unloading condition, the sealing member (30) blocks the furnace mouth (20). When the sintering furnace is in an unloading condition, the sealing member (30) can block the furnace mouth (20), the furnace chamber (10) does not contact with the outside directly, thus the temperature in the furnace chamber (10) will not drop sharply, and the service life of the sintering furnace will be increased.
A preparation method for a dental material with transmittance and color gradients and a product prepared thereby. The method comprises: (1) preparing at least three types of composite resin material precursor powder with different transmittances; (2) sequentially adding the precursor powder into a mold according to the transmittances in ascending order or in descending order, and performing dry pressing to obtain a preform body; alternatively, (2') dry pressing the first type of precursor powder into a first green body, wrapping the first green body with the second type of precursor powder and then performing dry pressing to obtain a second green body, and repeating the wrapping and dry pressing operations until all types of precursor powder are dry pressed to obtain a preform body; and (3) performing hot-pressing consolidation on the preform body prepared in step (2) or step (2') to obtain a dental material with transmittance and color gradients. By applying the present application, the flexural strength of prosthesis can be improved, and the aesthetic characteristics of natural incisal and gingival ends can also be better simulated.
Disclosed is a dual-purpose sintering furnace, comprising: a furnace body (1) having a hearth, and a first furnace mouth (11) and a second furnace mouth (12) in communication with the hearth; a furnace door (2) hinged onto the furnace body (1) and used for closing the first furnace mouth (11); a blocking member (3) lap-jointed inside the hearth and used for blocking the second furnace mouth (12); a sample stage (4); ejector rods (5) fixedly arranged on a sample placement face of the sample stage (4); and a rising and falling device (6) for driving the rising and falling of the sample stage (4), so that the ejector rods (5) push the blocking member (3) until the second furnace mouth (12) is opened, and the sample stage (4) enters the hearth via the second furnace mouth (12). The dual-purpose sintering furnace can complete a large amount of conventional sintering, and can also be used to implement rapid sintering.
The examples of the present application disclose a method for preparing a dental composite resin material and articles prepared therefrom, wherein the method comprises: (1) weighing in each of raw materials, including ethylenically unsaturated monomer, reinforcing fiber, filler, initiator, polymerization inhibitor and colorant; (2) mixing the weighed raw materials except reinforcing fiber, obtaining a composite resin monomer precursor; (3) impregnating the weighed reinforcing fiber into the composite resin monomer precursor for 1-5 hours, preferably 2-3 hours, at an impregnation negative pressure of less than or equal to 0.1 MPa, obtaining a composite resin monomer precursor-immersed reinforcing fiber; and (4) subjecting the composite resin monomer precursor-immersed reinforcing fiber to a solidification treatment, obtaining the dental composite resin material. The flexural strength of the dental composite resin material provided by the present application is above 600 MPa, and the light transmittance can be up to above 40%.
A rapid sintering system and rapid sintering method, the rapid sintering system comprising: a furnace body (110), the furnace body (110) comprising a hearth (111) and a furnace mouth (112) that communicate with each other; a lifting device (120) arranged below the furnace mouth (112), comprising a support (122) and a sample stage (121), the sample stage (121) being disposed on the support (122); a temperature acquisition device (130), disposed on the sample stage (121); a control device (140), disposed outside of the hearth (111), electrically connected to the lifting device (120) and the temperature acquisition device (130) and used to control lifting of the lifting device (120) according to a temperature acquired by the temperature acquisition device (130) and a preset sintering condition; and a spacer (150), disposed at a first end of the lifting device (120), a first spacing being present between the spacer (150) and the sample stage (121), and the furnace mouth (112) is blocked by the spacer (150) when the rapid sintering system is in a loading or unloading work state. The rapid sintering method uses the rapid sintering system.
A sintering furnace, comprising a furnace body and a lifting device. The furnace body comprises a furnace (10) and a furnace opening (20) which are connected to each other. The sintering furnace further comprises a blocking member (30), the blocking member (30) being disposed on the lifting device. When the sintering furnace is in a loading or unloading condition, the blocking member (30) blocks the furnace opening (20). When the sintering furnace is in an unloading condition, the blocking member (30) may block the furnace opening (20), thus preventing the furnace (10) from making direct contact with the outside and the temperature in the furnace (10) from dropping sharply, thereby prolonging the service life of the sintering furnace.
A method for preparing dental composite resin material, and a product prepared using dental composite resin materialThe method comprises: (1) weighing feedstocks, the feedstocks comprising ethylenically unsaturated monomers, enhanced fibers, a filler, an initiator, a polymerization inhibitor, and a colorant; (2) mixing all the weighed feedstocks other than the enhanced fibers to obtain a composite resin monomer precursor; (3) impregnating the weighed enhanced fibers in the composite resin monomer precursor for 1-5 hours, the impregnation pressure being small than or equal to 0.1 MPa, to obtain composite resin monomer precursor-adsorbed enhanced fibers; and (4) curing the composite resin monomer precursor-adsorbed enhanced fibers to obtain a dental composite resin material. The dental composite resin material has crossbreaking strength greater than 600 MPa and light transmittance greater than 40%.
C04B 41/85 - Coating or impregnating with inorganic materials
A61K 6/02 - Use of preparations for artificial teeth, for filling or for capping teeth
C04B 35/48 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on zirconium or hafnium oxides or zirconates or hafnates
The present invention relates to a method for changing the light transmittance of a dental zirconia material. By soaking pre-sintered zirconia in, or coating the same with, an yttrium or ytterbium salt solution, a material made of zirconia can meet the requirements for the light transmittance posed by the incisal part of anterior teeth of young patients, and the gradual change in light transmittance from the neck part of a dental crown to the incisal part becomes more natural, close to a natural tooth; moreover, for a dental crown prepared by adding a colouring agent to a powdery material itself or by dyeing via soaking in a dyeing liquor, there is no gradual changing effect in colour; and by soaking in or coating with an yttrium or ytterbium salt solution, the crown assumes a gradual change in colour. In addition, the present invention is easy to operate, low in cost, and has a stable quality.
C04B 35/48 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on zirconium or hafnium oxides or zirconates or hafnates
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