121results about "Medical preparations" patented technology

The invention relates to a zirconia-based all-ceramic false tooth and a preparation method thereof. A core layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 90 to 94 parts of ZrO2, 5 to 9 parts of Y2O3, 0.1 to 0.5 part of Al2O3, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2, and a shell layer of the zirconia-based all-ceramic false tooth is prepared from the following components in parts by mass: 24.5 to 49.5 parts of CaCO3, 45 to 50 parts of SiO2, 0 to 25 parts of MgO, 0.01 to 0.5 part of Fe2O3, 0.01 to 0.5 part of Er2O3 and 0 to 0.2 part of MnO2. The preparation process comprises the following steps: performing dry pressing and isostatic pressing on raw materials of the core layer, presintering, and carving to obtain a zirconia-based false tooth biscuit; meanwhile, calcining raw materials of a shell layer, then adding deionized water, a dispersing agent and an adhesive, and carrying out ball milling and mixing to obtain calcium-magnesium-silicon-based ceramic slurry; and coating the calcium-magnesium-silicon-based ceramic slurry on the surface of the zirconium oxide-based false tooth biscuit, and sintering to obtain the zirconium oxide-based all-ceramic false tooth provided by the invention. The zirconia-based all-ceramic false tooth has good jade texture and is closer to the natural color of natural teeth.

To obtain a better dispersion state of silica particles in a method for producing a composition comprising silane-treated silica particles dispersed in a polymeric monomer.SOLUTION: A method for producing a treated-silica dispersed monomer composition includes: mixing a basic silica dispersion liquid, in which silica is dispersed in a solvent containing 10 mass% or more of water, with a silane coupling agent to prepare a silane-treated silica dispersion liquid; mixing the silane-treated silica dispersion liquid with a polymerizable monomer to obtain a mixture; and removing a water phase from the mixture and obtaining a composition in which silica treated with the silane coupling agent is dispersed in the polymerizable monomer.SELECTED DRAWING: None

The application belongs to the technical field of dental antibacterial materials, and discloses a kind of nanometer composite antibacterial coating for dental material and preparation method thereof.Method: monomer modified arginine, monomer N-isopropyl acrylamide, monomer methyl hexyl acrylate, initiator azobisdimethylamino propanamide hydrochloride, dispersing agent cetyltrimethylammonium bromide and crosslinking agent N,N-methylene bis(acrylamide) are dissolved in water, and the reaction is carried out under protective atmosphere, dialysis, to obtain nanogel dispersion;The nanogel dispersion is mixed with the nanometer zinc oxide dispersion to obtain a nanogel composite zinc oxide antibacterial coating, and a coating is formed after coating.The nanometer composite antibacterial coating for dental material has excellent retention capacity and antibacterial performance.

To provide a production method of a sintered body that can obtain a sintered body satisfying light transmissivity required as a dental prosthetic material by short time sintering without essentially requiring precise temperature control at a high temperature region and without depending on a content of a stabilization element of a zirconia composition.SOLUTION: A production method of a zirconia sintered body containing a stabilization element comprises: a first temperature rising step for rising temperature of a zirconia composition containing the stabilization element from a temperature rising start temperature up to a first arrival temperature between 800°C or higher and lower than 1400°C with a rate of temperature increase of 150°C / minute or more; a second temperature rising step for rising the temperature from the first arrival temperature up to a second arrival temperature between 1400°C or higher and lower than 1580°C with a rate of temperature increase of over 30°C / minute and less than 200°C / minute; and a holding step for holding the temperature at the second arrival temperature.SELECTED DRAWING: None

The present invention relates to a dental / medical device that comprises poly(dioxanone) (PDO or PDS), preferably has an absorbent synthetic film exhibiting a color from white to grey, and is applied in the medical and dental fields. The dental / medical device may have stem cells and graphene used for inducing tissue reconstruction and / or inducing tissue regeneration of bone defects and other connective tissues (such as gingiva, skin, cartilage, cornea, etc.). Further, the present invention relates to the use of the device for the related applications described above and a method for manufacturing the device.

Provided is a glass that simultaneously achieves both chemical durability and sufficient acid neutralizing capacity and that is suitable as a dental composition displaying transparency when combined with a resin. The glass has a composition containing, by mass%, not less than 5.00% and not more than 15.00% of Si, not less than 2.00% and less than 6.00% of Al, not less than 10.00% and not more than 30.00% of Sr, not less than 2.00% and not more than 25.00% of Zn, not less than 2.00% and not more than 10.00% of B, not less than 17.00% and not more than 30.00% of F, not less than 16.00% and not more than 40.00% of O, and not less than 0% and not more than 0.50%, in total, of Li, Na, and K.

The application provides a zirconia composite powder, a preparation method of the zirconia composite powder, a zirconia ceramic and a dental restoration. The zirconia composite powder comprises zirconia matrix particles and cubic phase zirconia particles, the zirconia matrix particles comprise monoclinic phase zirconia and tetragonal phase zirconia, and at least part of the cubic phase zirconia particles form an interface with the zirconia matrix particles in an atomic scale. After sintering of the composite powder in the above manner, the mechanical strength and toughness required by the dental restoration can be obtained, and the hardness is reduced, so that the hardness matching with the opposite tooth is improved, and the pathological abrasion risk is reduced.

Proposed is a dental composition. The dental composition includes 20 to 40 wt of dispersed phase zirconia solid solution and 60 to 80 wt of matrix phase zirconia solid solution.

The application discloses a periapical tissue regeneration type root canal paste, a preparation method and application thereof. The periapical tissue regeneration type root canal paste is composed of Iroot-sp paste and additives, and the mass ratio of the Iroot-sp paste to the additives is 60-80:20. The root canal paste is used for oral tissue regeneration and root canal filling and barrier. Compared with the sealant in the prior art, the root canal paste has great improvement in biocompatibility and remineralization capacity.

This invention relates to the field of medical ceramic materials technology, and more particularly to a method for preparing a zirconia-based medical composite ceramic material. The method includes: adjusting the target number of cycles in response to the slurry mixing state, or compensatingly adjusting the spray granulation process parameters based on slurry state parameters; determining whether the current batch of green bodies has a risk of closed pores based on the green body characteristics, and determining an adjustment feature point based on the actual shrinkage rate variation; stopping the sintering heating and adding a holding stage in response to the adjustment feature point, and determining the intermediate holding temperature and the holding stage duration; obtaining the sintered body phase to determine the tetragonal zirconia retention rate, and determining whether the sintering adjustment strategy matches the characteristics of the current batch of slurry based on the sintered body performance; and adjusting the intermediate holding temperature of subsequent sintering processes based on the tetragonal phase retention rate deviation in response to the sintered body performance. This invention improves the performance of ceramic implants by adjusting the sintering temperature curve based on the characteristics of zirconia-based powder.

The present invention relates to a novel dental prosthetic material and a patient-customized dental prosthesis comprising same, the material improving water resistance, reproducing a color similar to an actual tooth, and thus improving the aesthetic appearance even after prosthetic treatment. In addition, patient-customized prosthetic treatment can be performed using a 3D printer on a tooth requiring prosthetic treatment. The material exhibits enhanced physical properties compared to existing photocurable resin compositions and has excellent adhesive strength, thereby preventing a dental prosthesis from detaching after treatment.

Provided is a photocurable resin composition used for producing a three-dimensional formed article by a liquid tank photopolymerization method, the photocurable resin composition containing (A) a radically polymerizable monomer, (B) an inorganic filler, (C) a photopolymerization initiator, (D) an activated light absorbent, (E) a polymerization inhibitor, and (F) a chain transfer agent, wherein: at least 90 mass % of the component (A) has two or more (meth)acryloyl groups in the molecule, and is composed of a polyfunctional (meth)acrylate-based radically polymerizable monomer (a) having 5 to 25 atoms constituting a main chain of a divalent group interposed between the two or more (meth)acryloyl groups; and the component (a) is composed of a polyfunctional monomer a1 having a specific group such as a urethane group and a polyfunctional monomer a2 other than the polyfunctional monomer a1. Also provided is a method for producing a three-dimensional photoformed article by using the photocurable resin composition.

A dental adhesive composition containing a polymerizable monomer (A) having an acidic group and a photoredox catalyst (B) having a singlet excited state reduction potential ES1red of 1.5 V vs SCE or more.

Proposed is a dental composition. The dental composition includes 20 to 40wt% of dispersed phase zirconia solid solution and 60 to 80 wt% of matrix phase zirconia solid solution.

Glass-ceramics toughened via Zr02have high molar fractions of tetragonal Zr02and fracture toughness values greater than 1.8 MPa-m 1 / 2 The glass-ceramics can also include other minor phases, including lithium silicate, which can be beneficial for toughening or strengthening via an ion exchange process. Additional second phases can also reduce the coefficient of thermal expansion of the glass-ceramics. Methods of making such glass-ceramics are also provided.

Provided is a kit for preparing a curable composition for a dental material including a polymerization accelerator, which includes a first preparation including a first monomer and a second preparation including a second monomer, in which at least one of the first preparation or the second preparation contains an organosiloxane including a polymerizable group and a hydroxyl or alkoxy group.

To provide a dental prosthesis capable of improving wearing feeling, and reducing pain and discomfort when wearing the dental prosthesis.SOLUTION: A manufacturing method of a dental prosthesis has the steps of: calculating a pressure distribution 101 to an oral mucosa by the dental prosthesis 100 based on a three-dimensional data set of the dental prosthesis 100 and a three-dimensional data set of the oral mucosa 105; and determining a space area 107 for elastic manufacturing material 109 inside the dental prosthesis based on the calculated pressure distribution.SELECTED DRAWING: Figure 3

A resin based material whose composition includes a light-curable mixture of monomers of no more than 35 wt. % of an ethoxylated difunctional bisphenol A dimethacrylate; of no more than 10 wt. % of a methacrylate monomer; of no more than 10 wt. % of a difunctional urethane acrylate; of no more than 0.1 wt. % of an optical brightener; of no more than 5 wt. % of silica particles having methacrylate functionalization layers and having an average particle size of less than about 200 nm; of having more than 40 wt. % of an inert glass; of no more than 15 wt. % of a heavy metal oxide; of no more than 2.5 wt. % of an ultraviolet / visible (UV / Vis) light-photo-polymerization initiator; a colorant; and a stabilizer.

The present application relates to biological materials and its stomatological technical field, specifically relates to a kind of pH response enameloid composite resin, preparation method and application thereof, high aspect ratio hydroxyapatite nanowire is synthesized by hydrothermal method, hydroxyapatite (HA) nanowire is assembled directionally using "bottom-up" method, the multistage structure of dental enamel is bionically constructed, and it is combined with the organic resin matrix of methyl methacrylate dodecyl methyl amino ethyl ester (DMAEM) monomer with pH response antibacterial performance, constructs a kind of antibacterial dental restorative material with the multistage structure of dental enamel, the material not only shows excellent operability, mechanical performance and optical characteristics, but also can effectively play acid-responsive antibacterial effect during biological membrane imbalance, help to maintain oral microecological balance.

A titanium material includes 91% by mass or more of titanium, wherein an electrical resistivity ω µΩ·m of the titanium material and a content ratio c % by mass of a component of the titanium material other than the titanium indicates a relation of the following formula I: ω>0.16c+0.56 Formula I, and in the formula I, c is 0 or more and 9 or less.

A dental material according to the disclosure contains zinc-supporting zirconium phosphate in which zinc ions are supported on zirconium phosphate.

To provide a dental block material using a thermoplastic resin that is easy to process with CAD / CAM and has sufficient hardness for use as a CAD / CAM processed product. [Solution] The dental block material according to the present invention is made of a thermoplastic resin having a Vickers hardness of 20HV0.2 to 35HV0.2 as defined in JIS Z 2244, a flexural strength of 150MPa to 250MPa and a flexural modulus of 2 to 10GPa as defined in JIS T 6517:2011.

The application belongs to the technical field of biomedical materials, and particularly relates to an amorphous zirconium oxide ceramic material matched with tooth enamel in terms of mechanics, and a preparation method and application thereof. The amorphous zirconium oxide ceramic material is obtained by network connection of zirconium hydroxide particles after dehydration condensation of hydroxyl groups of adjacent zirconium hydroxide particles to form bridging oxygen bonds through hot-press bonding, with the zirconium hydroxide powder treated by freeze-drying as raw material. The amorphous zirconium oxide ceramic material has the following advantages: (1) the mechanical properties are matched with human tooth enamel, and the opposite tooth is protected from excessive wear; (2) the pure inorganic system has long-term stability, and aging of resin is avoided; (3) a centimeter-level block is prepared, and the limitation of coating is broken, so that the amorphous zirconium oxide ceramic material can be widely applied to dental restorations; and (4) the amorphous zirconium oxide ceramic material has good machinability and biocompatibility.

Methods for making natural-looking dental prosthesis that meet several aesthetic indicators are described, including precoloring methods, compositions, and kits for obtaining a natural-looking dental prosthesis. In one aspect, several different compositions are applied to certain surface areas of a dental prosthesis via a precolor pattern. Exemplary compositions include a colorant composition, an opaque composition, and an incisal composition. The colorant composition may include Zn, Al and at least one coloring agent. The opaque composition may include at least one opaquing agent. The incisal composition may include a Mg component.

To provide an adhesive composition that comprises a chemical polymerization initiator blended in a radical-polymerizable monomer comprising (g) a polymerizable monomer with an acidic group and (h) a polymerizable monomer without an acidic group, wherein the adhesive composition exhibits superior adhesion and superior coating thickness even when used in systems containing high levels of water and oxidative components, particularly in the case of dentin.SOLUTION: A chemical polymerization initiator comprises (a) a thiourea compound, (b) peroxyester, (c) a bivalent copper compound and (d) powder, comprising one or more ascorbates selected from 2-phospho-L-ascorbic acid trisodium salt, calcium ascorbate and sodium isoascorbate, with an average particle size of 0.1-20 μm.SELECTED DRAWING: None

A method for manufacturing a dental prosthesis (2), which is provided with a number of matrix elements (18) corresponding to one of the matrix elements (14) in each case for removable fixation on a number of teeth (6) crowned with a respective male element (14) in the mouth of a patient, should be designed for a particularly high accuracy of fit of the dental prosthesis (2) using methods which are kept as simple as possible. According to the invention, multi-part matrix elements (18) are used for this purpose, each comprising an inner cap (32) which can be slipped onto the associated male element (14) and an outer cap (34) which is attached to the dental prosthesis (2), wherein in the space between the inner and outer caps (32, 34), an intermediate body (36) made of thermoplastic material connecting them to one another being arranged in the space between the inner and outer caps (32, 34), the intermediate body (36) being heated to a temperature above its softening temperature and thus being made deformable in order to align the inner cap (32) precisely relative to the outer cap (34) of the respective matrix element (18), and then, using the deformability of the intermediate body (36), the inner cap (32) is aligned relative to the outer cap (34) with regard to an optimized accuracy of fit, taking into account intraoral data reflecting the actual dentition situation in the oral cavity of the patient, before the relative position of the inner cap (32) set in this way relative to the outer cap (34) is preserved as a result of the solidification of the intermediate body (36) occurring during the subsequent cooling of the intermediate body (36).

A photocurable composition, contains a (meth)acrylic monomer component, and photopolymerization initiator, in a case in which a rectangular sheet-like test piece A1 with a length of 40 mm, a width of 10 mm, and a thickness of 1.0 mm is produced by photomodeling under conditions in which the photocurable composition is irradiated with visible light having a wavelength of 405 nm at an irradiation dose of 11 mJ / cm2 to form a cured layer A1 with a thickness of 50 µm, the cured layer A1 is stacked in a thickness direction thereof to form a rectangular sheet-like modeling product A1 with a length of 40 mm, a width of 10 mm, and a thickness of 1.0 mm, and the modeling product A1 is irradiated with ultraviolet rays having a wavelength of 365 nm at an irradiation dose of 3 J / cm2 to produce the test piece A1, a storage elastic modulus at 25 °C of the test piece A1 is 10 MPa or more and a storage elastic modulus at 37 °C of the test piece A1 is 400 MPa or less.

The present invention provides a biocompatible material that has a membrane capable of achieving osteogenesis therearound in a relatively short period of time. The biocompatible material provided by the present invention has a membrane that comprises magnesium optionally together with calcium, wherein: when the total weight of magnesium and calcium in the membrane is regarded as 100 wt%, the calcium content of the membrane is 0-40 wt%; and the arithmetic mean surface height Sa1 of the surface roughness of the membrane is 2 um or less and / or the arithmetic mean surface height Ra1 of the line roughness of the membrane is 2 um or less.