46 results about "Dental ceramics" patented technology

Improved systems and methods for producing dental restorations and ceramic materials for such restorations are disclosed. Optical properties, preferably including color and translucence characteristics, of a tooth or teeth of a patient are measured with a shade measuring instrument. The tooth to be restored is prepared, and a physical or virtual dental impression is created. A prescription for the restoration, which typically includes color, translucence and thickness information, is sent to the restoration fabrication facility either electronically or physically. A recipe and / or a mixture of ceramics are generated for the restoration, with multiple layers being specified, based on the measured optical properties. The recipe algorithm may adapt, or process checks may be performed, based on measurements of fabricated layers. Preferably, dental ceramics are specified to bracket the region of color space relevant to human teeth, and a reduced set of ceramic materials are manufactured and distributed. Based on measured optical characteristics of the ceramic materials, recipes and / or material mixtures are specified or prepared for the restoration. A virtual impression data file may be transmitted to the laboratory instead of a physical impression.

A ceramic restoration based on a leucitic glass-ceramic, which is characterized in that the glass-ceramic includes by way of componentsin that it contains, as sole crystalline phase, leucite in a total proportion from 20 to 45 wt.-%, at least 80% of the theoretically producible quantity of leucite being present, and in that it exhibits a linear coefficient of thermal expansion alpha(20-500° C.) from 12.5.10-6 to 15.5.10-6 K-1. This glass-ceramic is particularly suitable for processing as pressed ceramic and can be advantageously faced with dental ceramic that exhibits a linear coefficient of thermal expansion alpha(20-500° C.) from 13.5.10-6 to 17.0.10-6 K-1.

The invention discloses a gradient transparent zirconium oxide dental ceramic and a preparation method thereof, which belongs to the technical field of preparation of dental ceramics. The raw material is formed by mixing 2 to 5 kinds of zirconium oxide ceramic powder with different sintering transparences. The transparence of the sintered zirconium oxide ceramic from the bottom to the top is gradually increased, and the ceramic comprises 5 to 11 types of ceramic layers with different transparences. The preparation method comprises five steps, namely preparation of mixed powder, dry pressing, cold isostatic pressing, pre-sintering and blank restoration. The preparation method is simple and feasible, the transparence distribution characteristic of the prepared dental zirconium oxide full-ceramic material is similar to that of natural teeth, and the attractiveness of the zirconium oxide full-ceramic restoration is improved.

A system, method and composition for coloring dental ceramics. The system, method, and composition resulting in natural color matching without drying time between color layers. The system, method and composition also resulting in good color preparation on restorations of about 0.001 mm-1.000 mm thickness.

An object of the present invention is to provide a one-pack type dental adhesive composition which can exhibit excellent adhesion to any material, for example, dental ceramics, organic composites containing inorganic compounds, dental noble metals and dental non-noble metals, and also has excellent storage stability.Disclosed is a one-pack type dental adhesive composition comprising a silane coupling agent as a component (a), an acidic group-containing polymerizable monomer as a component (b), a sulfur atom-containing polymerizable monomer as a component (d), and other components.

An object of the present invention is to provide a one-pack type dental adhesive composition which can exhibit excellent adhesion to any material, for example, dental ceramics, organic composites containing inorganic compounds, dental noble metals and dental non-noble metals, and also has excellent storage stability.Disclosed is a one-pack type dental adhesive composition comprising a silane coupling agent as a component (a), an acidic group-containing polymerizable monomer as a component (b), a sulfur atom-containing polymerizable monomer as a component (d), and other components.

In dental ceramics containing zirconium dioxide and sili-con-dioxide with a Zr / Si ratio of between 0.5 and 1.0, 1 to 12 wt % of aluminum oxide and up to 2 wt % of an alkali - or earth alkali metal oxide, those materials are selectively mixed with yttrium-stabilized zirconium dioxide with a Zr / Si ratio of the mixture being between 0.5 and 1 wt % and also a silicon organic compound as well as a compression aid, and a green body is formed from the mixture by milling, which green body is then sintered.

Methods for manufacturing a dental restoration for a patient and dental ceramics production devices are disclosed. A dental restoration may be designed based on a scan of the patient's mouth, using a CAD software module. The software module may produce conveyor channels for a positive model based on the dimensions of a muffle in relation to the size and shape of the positive model. The conveyor channels may extend at an angle of between 0° and 130° away from an axis of the pressing channel, the axis being located essentially along an isotherm inside the muffle. A docking site may be selected based on a position with the greatest wall thickness of the positive model. The present disclosure allows the creation of a high-quality dental restoration in a very efficient fashion, in particular when lithium disilicate is used as the dental ceramics material.

A microcrystal glass used for repairing tooth contains K2O (15-25%), Al2O3 (20-30 %), SiO2 (50-60%), CaO (1-6%), MgO (0.1-0.8%), Fe2O3 (0.04-0.1%) and TiO2 (0.04-0.1%), and is prepared through mixingsaid raw materials, grinding, baking, smelting, cold isostatic pressing for shaping, nucleating, crystallizing and heat treating. Its advantages are high strength, and excellent physical and chemicalproperties.

Metal alloys for dental porcelain fusing and dental prosthetic appliances are provided. The metal alloy includes: gold (Au) in an amount that is greater than 0 and equal to or smaller than 35 weight %; silver (Ag) in an amount of 5 to 35 weight %; indium (In) in an amount of 6 to 40 weight %; palladium (Pd) in an amount of 30 to 70 weight %; and at least one element selected from the group consisting of boron (B), germanium (Ge), zirconium (Zr), silicon (Si) and iron (Fe) in a total amount that is greater than 0 and equal to or smaller than 5.0 weight %.

The present invention provides a one-component dental adhesive composition which can exhibit excellent adhesion to both materials of a dental ceramics and an organic composite containing an inorganic compound, and is excellent in can-stability. More particularly, the present invention provides a one-component dental adhesive composition comprising 1 to 60 parts by weight of (a) a silane coupling agent, 1.0 to 20.0 parts by weight based on 100 parts by weight of the (a) component of (b) an acidic group-containing polymerizable monomer, and 28 to 99 parts by weight of (c) a volatile organic solvent.

The invention discloses a zirconia tenacity-increasing alumina oxide dental ceramics substrate crown gelcasting forming method; the method comprises the following steps: dipping a special provided ceramic slurry by a stack porcelainsmall brush to compost all ceramic crown inner core on a dental die surface of a clinical patient and standing the dental die; absorbing the water content on the surface of the slurry and densifying to form embryonic core, and then drying the embryonic core at a constant temperature, taking off the all ceramic crown from the dental die, and sintering the all ceramic crown at a high temperature to prepare the ceramics substrate crown. In the invention, gel systems composed of organic monomer and crosslinker are used, high solid content and strongly plastic core biscuit is obtained by the free radical polymerization reaction, nano-ceramic particles are used as dispersed phase to introduce micron ceramic matrix to prepare a nano-composite ceramic, and the nano-composite ceramic has good strenghing and toughing effect, high strength material and high toughness, small change of sintering volume, moreover the forming method of the invention is easy and fast to operate, and can prepare dental ceramics substrate crown into various complicated shapes and approach net size forming.

The invention discloses a preparing method for coloring zirconium oxide powder and a preparing method for multilayer and multicolor dental ceramics. The preparing method comprises the steps that 1, salt colorant of soluble rare earth is dissolved into water, or ethyl alcohol or mixed liquor of the water and ethyl alcohol, high-transparency or medium-transparency or low-transparency dental zirconium oxide powder is added, and the mixture is stirred and poured into a baking disc; 2, the baking disc is placed in a shady and cool place and dried to obtain dry powder; 3, ball milling is carried out, and screening is carried out through a 60-300-mesh separating sieve to obtain small powder; 4, the small powder and one or more kinds of high-transparency, medium-transparency and low-transparency dental zirconium oxide powder are mixed uniformly according to different proportions to obtain the coloring zirconium oxide powder. According to the preparing method for the multilayer and multicolor dental ceramics, three to seven kinds of the coloring zirconium oxide powder of the same tone are pressed in a layering and dry pressing mode, pressed in an isostatic pressing mode, and presintered according to the color sequence from dark to light and transparency from small to big to obtain a multilayer and multicolor zirconium oxide blank. The preparing method can prepare dental prosthesis with the transparency and the chromaticity being similar to those of natural teeth.

A silicate dental ceramic-based blasting medium for the improvement of the adhesive bond between fire-on ceramic and alloy. In contrast to the traditionally used Al2O3 blasting medium, the complete sealing of the alloy-ceramic contact layer is guaranteed. In this way, the penetration of moisture (from the milieu of the mouth) in the contact layer is prevented. The phenomenon of bubble formation known from practice in dental work worn on a trial basis can thus be stopped after correction firing.

The invention relates to the technical field of dental ceramics, in particular to a preparation process of a multilayer-permeability and multilayer-strength false tooth. The preparation method comprises the following steps: (1) mixing at least two kinds of zirconium oxide powder with different light transmittance according to different weight proportions to obtain mixed zirconium oxide powder withdifferent colors, paving the mixed zirconium oxide powder layer by layer in a sequence from dark to light, and then pre-pressing to obtain a multilayer light transmittance green body; (2) carrying out integral dry pressing and isostatic pressing molding on the multilayer light transmittance green body, presintering the multilayer light transmittance green body to obtain a multilayer zirconium oxide ceramic block, and cutting the multilayer zirconium oxide ceramic block to form a false tooth; and (3) soaking the false tooth in a staining solution, then taking out the false tooth, drying, and sintering to obtain the multilayer-permeability and multilayer-strength false tooth. The denture obtained by the method disclosed by the invention is natural and attractive in gradual change from the cutting end to the gingival end, and the strength from the cutting end to the gingival end is changed from 690-1200MPa, so that the damage to jaw teeth due to the fact that the zirconium oxide cuttingend is too hard is avoided.

The invention provides a glass composition which can be used for a dental porcelain or a dental ceramics coloring material, and has low temperature meltability, acid resistance and preservation stability under the humid environment which are required for a dental porcelain or a dental ceramics coloring material, and a dental porcelain and dental ceramics coloring material which contain the glass composition powder. The invention provides a low melting glass composition with softening point (Ts) less than 600 degrees centigrade comprising, as a component; SiO2: 55.0 to 75.0 wt.%, B2O3: 6.1 to 12.0 wt.%, Al2O3: 2.0 to 8.0 wt.%, ZnO: 2.0 to 85 wt.% and two or more kinds of alkali metal oxide: 10.5 to 20.0 wt.%.

To provide a a glass composition which can be used for a dental porcelain or a dental ceramics coloring material, and has low temperature meltability, acid resistance and preservation stability under the humid environment which are required for a dental porcelain or a dental ceramics coloring material, and a dental porcelain and dental ceramics coloring material which contain the glass composition of the present disclosure. To provide a low melting glass composition with softening point (Ts) less than 600° C. comprising as a component; SiO2: 55.0 to 75.0 wt. %, B2O3: 6.1 to 12.0 wt. %, Al2O3: 2.0 to 8.0 wt. %, ZnO: 2.0 to 8.5 wt. % and two or more kinds of alkali metal oxide: 10.5 to 20.0 wt. %.

Improved systems and methods for producing dental restorations and ceramic materials for such restorations are disclosed. Optical properties, preferably including color and translucence characteristics, of a tooth or teeth of a patient are measured with a shade measuring instrument. The tooth to be restored is prepared, and a physical or virtual dental impression is created. A prescription for the restoration, which typically includes color, translucence and thickness information, is sent to the restoration fabrication facility either electronically or physically. A recipe and / or a mixture of ceramics are generated for the restoration, with multiple layers being specified, based on the measured optical properties. The recipe algorithm may adapt, or process checks may be performed, based on measurements of fabricated layers. Preferably, dental ceramics are specified to bracket the region of color space relevant to human teeth, and a reduced set of ceramic materials are manufactured and distributed. Based on measured optical characteristics of the ceramic materials, recipes and / or material mixtures are specified or prepared for the restoration. A virtual impression data file may be transmitted to the laboratory instead of a physical impression.

The present invention provides a one-component dental adhesive composition which can exhibit excellent adhesion to both materials of a dental ceramics and an organic composite containing an inorganic compound, and is excellent in can-stability. More particularly, the present invention provides a one-component dental adhesive composition comprising 1 to 60 parts by weight of (a) a silane coupling agent, 1.0 to 20.0 parts by weight based on 100 parts by weight of the (a) component of (b) an acidic group-containing polymerizable monomer, and 28 to 99 parts by weight of (c) a volatile organic solvent.

Metal alloys for dental porcelain fusing and dental prosthetic appliances are provided. The metal alloy includes: gold (Au) in an amount that is greater than 0 and equal to or smaller than 35 weight %; silver (Ag) in an amount of 5 to 35 weight %; indium (In) in an amount of 6 to 40 weight %; palladium (Pd) in an amount of 30 to 70 weight %; and at least one element selected from the group consisting of boron (B), germanium (Ge), zirconium (Zr), silicon (Si) and iron (Fe) in a total amount that is greater than 0 and equal to or smaller than 5.0 weight %.

The present invention relates to a gradient bionic dental ceramic, which comprises: a porous ceramic frame, which is of a TPMS structure, and is internally provided with fully-communicated net-shaped through holes; a polymer; wherein the net-shaped through holes are filled with the polymer. The preparation method has the beneficial effects that the porous ceramic frame with the TPMS structure is printed by adopting a 3D printing technology, the TPMS smooth full-communication porous structure has more excellent mechanical property and permeability, a perfect bonding interface can be formed between a polymer and the porous ceramic frame, and when the ceramic is stressed to generate cracks, the mechanical property of the porous ceramic frame is greatly improved. The polymer filled in the porous structure can prevent crack propagation, greatly improves the fracture toughness of the material, and prevents the material from losing efficacy due to fatigue.

For a simplified method for heating a pre-warmed muffle used for dental ceramics in a dental furnace, wherein a saving of time in heating before the pressing and also a parallel heating of the muffles should be made possible, the following steps are suggested: a) heating of the muffle to a maximal temperature (Tmax), which is above the pressing temperature (Tpress), in which pressing is carried out, b) possibly keeping the muffle at a maximal temperature (Tmax) during a first pause (t-1), c) cooling of the muffle to a minimal temperature (Tmin), which is at most as high as the pressing temperature (Tpress), and d) keeping the muffle at a minimal temperature (Tmin) during a second pause (t2). In addition, a corresponding control device for the dental furnace and a furnace equipped with this kind of control device are produced.

A system, method and kit for coloring dental ceramics. The system, method, and kit resulting capable of adjusting the shade of a dental restoration milled from a colored zirconia porcelain block from one color value of the VITA shade guide to a different color value of the VITA shade guide.

The invention relates to the technical field of ceramic materials, and discloses a dental ceramic material and a preparation method and application thereof. The dental ceramic material comprises a basic blank and multiple bionic ceramic composite surface layers. The bionic ceramic composite surface layers comprise zirconium oxide and calcium phosphate. The contents of calcium phosphate in the bionic ceramic composite surface layers are different. The bionic ceramic composite surface layers are formed on the basic blank in a gradient manner according to the sequence of the calcium phosphate contents from low to high. The dental ceramic material has both mechanical properties and biological properties and can be directly used as an implant or a dental crown during use, and brittle failure and excessive wear phenomena cannot easily occur. According to the invention, the bionic ceramic composite surface layers are prepared on the surface of the basic blank by using a spin-coating method, so that the performance difference between the coating and the basic blank is slowed down, the bonding strength and wear resistance of the coating on the surface of the basic blank are improved, and the dental ceramic material with more excellent performance is obtained.

The invention discloses a method for modifying the bonding surface of dental non-silicate-based ceramics, which belongs to the tooth restoration technology. Including the film forming process and the heat treatment step of the restoration after film formation; the dental ceramic restoration is sandblasted with 110 μm alumina for 20 seconds under a pressure of 0.2 MPa, ultrasonically cleaned in absolute ethanol for 10 minutes, and dried. Brush the sandblasted surface evenly with 40% nano-silica sol, and then place it in a closed environment with a relative humidity of 60-70% to dry for 24 hours. Then heat treat. The beneficial effect of the invention is that it can prepare high-quality coatings on the bonding surface of complex dental non-silicate-based ceramic restorations, simplifies the operation steps, reduces the cost, and achieves the principle of not affecting the aesthetic effect. For the purpose of improving the ceramic / resin bonding strength, the relevant materials and equipment do not need to be imported, which is in line with the national conditions, has good clinical application prospects and high practical value.