809results about "Dentistry 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.

Adhesive compositions including a multivalent metal salt, an multidentate acidic organic compound, and an aqueous medium are disclosed. The multivalent metal salt and multidentate acidic organic compound can include, as a mixture, a carbonate salt and / or carbonic acid. The aqueous medium can include pH adjusting agent such as sodium hydroxide. The adhesive composition, upon curing, can have a porosity of 10-50%. The adhesive composition, upon curing, can include a plurality of pores. The adhesive composition can be porous, and upon curing can have a plurality of pores having a pore size of between 20 μm to 200 μm. Methods of producing the adhesive composition are disclosed. Methods of using the adhesive composition are further disclosed.

The invention discloses a double-component reinforced 5Y-PSZ dental ceramic material and a preparation method thereof, and relates to the technical field of ceramic material preparation. The method comprises the following steps: mixing ZrCl4 and deionized water, and dropwise adding an ammonia water solution to prepare m-ZrO2 nano ceramic powder; zrOCl2. 8H2O, Y (NO3) 3.6 H2O and deionized water are mixed, the m-ZrO2 nano ceramic powder and polyethylene glycol 2000 are added, and the material is prepared through calcination, spray granulation, hot-pressing presintering and high-temperature sintering. According to the 5Y-PSZ dental ceramic material disclosed by the invention, the nano-scale m-phase ZrO2 is adopted as a reinforcing material and is dispersed and distributed inside the 5Y-PSZ, and through volume expansion generated by t-m phase change of the m-phase ZrO2, the anti-aging performance is guaranteed, and meanwhile, the reinforcement of the 5Y-PSZ dental ceramic material is realized. The invention solves the problem of insufficient strength of the 5Y-PSZ dental ceramic material in the prior art.

The invention discloses a synergistic phase change reinforced dental zirconia material and a preparation method and application thereof, and relates to the technical field of ceramic materials.The preparation method comprises the following steps that a zirconium oxychloride solution and a polyvinyl alcohol solution are mixed, dried and then subjected to heat treatment, and ZrC ceramic powder is obtained; then mixing with yttria-stabilized zirconia (Y-PSZ) to obtain composite powder; the composite powder is subjected to hot pressing sintering and cooling, and a pre-sintered body is obtained; introducing Ar-O2 mixed gas, and carrying out controllable oxidation to obtain an oxidation phase change reinforced pre-sintered body; and carrying out high-temperature sintering to obtain the synergistic phase change reinforced dental zirconia material. The invention further discloses the synergistic phase change reinforced dental zirconia material and application of the synergistic phase change reinforced dental zirconia material in preparation of dental products. According to the method, ZrC is introduced, and a pressure stress field formed by crystal transformation in ZrC oxidation and high-temperature sintering processes is utilized, so that the yttrium oxide stabilized zirconia dental ceramic is strengthened, and the mechanical strength of the yttrium oxide stabilized zirconia dental ceramic is remarkably improved.

The invention relates to a light-cured dental resin adhesive containing a silane coupling agent modified monomer as well as preparation and application of the light-cured dental resin adhesive. The dental resin adhesive comprises a resin matrix, an organic polymer and a photoinitiator, wherein the resin matrix consists of methacrylate resin grafted and modified by a silane coupling agent and unmodified methacrylate resin. According to the method, the isocyano group of the silane coupling agent is selected to react with the hydroxyl group on the resin monomer to generate the silane modified grafted resin monomer, and the method is simple, low in equipment requirement and suitable for large-scale production; the obtained dental resin adhesive can be internally covalently cross-linked to enhance the self mechanical property, can also be chemically bonded with a bonding substrate by utilizing a grafted silane coupling agent to improve the interface bonding strength, is especially suitable for being used as an enamel bonding material, and can remarkably improve the service life and the curative effect of a bonded restoration.

The present invention relates to methods for curing polymeric dental appliances comprised of partially cured photopolymerizable components, especially for additively manufactured denture base and artificial tooth components utilized in the production of full and partial dental prostheses. In particular, the invention relates to methods of utilizing a curing apparatus having one or more controllable heating sources and one or more controllable LED light sources to achieve specific preheating and light curing conditions for more effectively converting partially cured photopolymerizable components from a partially cured state to a final cured state.

A photocurable composition includes a (meth)acrylic monomer component and a photopolymerization initiator, wherein an adhesive force of a cured product is less than or equal to 1.5 N, and a rupture elongation of the cured product is greater than or equal to 20%.

The invention relates to the technical field of medical materials, in particular to a composite root canal filling agent premixed with a calcium silicate-niobium compound as well as a preparation method and application of the composite root canal filling agent. The composite root canal filling agent comprises (a) a calcium silicate compound, (b) a phosphate compound, (c) a calcium compound, (d) a niobium compound, (e) a radiation-resistant material, (f) a water-miscible non-aqueous phase solvent and (g) an organic matter, the total mass of the component (a), the component (b), the component (c), the component (d), the component (e) and the component (g) accounts for 60-95% of the total mass of the filling agent, and the total mass of the component (a), the component (b), the component (c), the component (d), the component (e) and the component (g) accounts for 20-30% of the total mass of the filling agent. And the component (f) accounts for 5-40% of the total mass of the filling agent. The filling agent is fast in solidification, good in biological activity, excellent in antibacterial performance and convenient to popularize and apply.

The present invention relates to a hardenable composition for use in a process of treating a dental condition in a patient's oral cavity, comprising: radiation-curable component(s); photoinitiator(s), wherein the photoinitiator exhibits absorption in the UV light region and absorption in the visible light region, wherein the absorption in the UV light region is stronger than the absorption in the visible light region; optionally filler(s); and optionally additive(s), wherein the process comprises the steps of layer-by-layer additive manufacturing of a dental or orthodontic article using radiation having a wavelength in the UV light region; attaching the dental or orthodontic article to a surface of dental hard tissue or dental material; and applying radiation having a wavelength in the visible light region to the dental or orthodontic article.

The present invention relates to denture adhesive compositions having a reduced viscosity facilitating ease of application and use, particularly for older adults or consumers having limited hand movement or strength. Despite a reduced viscosity, the compositions exhibit hold (adhesion over time) and other characteristics comparable with commercially available formulations.

Provided are a lithium disilicate glass-ceramic green body, a preparation method therefor, and a use thereof. The lithium disilicate glass-ceramic green body comprises a lithium disilicate main crystal phase, crystal size in the lithium disilicate glass-ceramic blank being between 50 and 400 nm, and the proportion of the area of crystal grains having a length greater than 350 nm to the total area being less than 30%. The present disclosure, by means of controlling the internal crystal size of the lithium disilicate glass-ceramic green body to be below 400 nm, enables same to be directly machined without damaging the machining equipment, and combines the advantages of high strength, machinability and direct coloration. This can reduce the waiting time for patients to receive dental restorations, solve the problem of patients being unable to know the color of all-ceramic dentures before fabrication, and overcome a bottleneck for all-ceramic denture restoration materials for same-day delivery. It has great significance for achieving preoperative color matching and rapid restoration in clinical practice.

Provided is dental glass having sufficient antibacterial properties through the inclusion of zinc. This dental glass contains 41-52 mass% of ZnO, 47-51 mass% of P2O5, 7 mass% or less of MgO, and 9 mass% or less of CaO. The fluorine content in the dental glass is preferably 3 mass% or less. The dental glass can be easily produced through a mixing step for mixing a starting material solution containing a zinc salt solution, a phosphate solution, an optional magnesium salt solution, and an optional calcium salt solution to form aggregates in the starting material solution, and a drying step for drying the aggregates to obtain a powder.

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 invention discloses sub-nanowire modified resin as well as a preparation method and application thereof, and belongs to the technical field of biological medicines. The resin comprises sub-nanowires and a resin matrix, and solves the problem of poor adhesion caused by excessive hydration of an adhesion interface in clinical operation. Meanwhile, through the multi-stage interaction between the resin matrix and the sub-nanowires, the cohesive stability of the resin and the adhesive property of the resin can be improved at the same time. The resin disclosed by the invention can be applied to the fields of tooth restoration and the like, in particular to the aspects of tooth bonding, filling and the like.

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

To provide a dental curable composition having curing characteristics suitable for use as a dental material.SOLUTION: A dental curable composition comprises 100 pts.mass of (A) a polymerizable monomer, 0.05-5 pts.mass of (B) a peroxyester compound, 0.001-0.05 pt.mass of (C) a bivalent copper compound, 0.05-2.5 pts.mass of (D) a saccharin compound, and 0.05-2.5 pts.mass of (E) a reductant for copper.SELECTED DRAWING: None

To provide dental curable compositions containing a relatively simple inorganic filler, the compositions providing cured products with good mechanical and physical properties, having fluidity applicable to deep cavities, not only enabling aesthetic restoration but having paste properties enabling easily handling with a syringe, and further having good shape retention.SOLUTION: In a dental polymerization curable composition containing a polymerizable monomer (A), an inorganic filler (B), and a polymerization initiator (C), as at least a part of the inorganic filler (B), an inorganic particle (B1) that is treated with a surfactant and a hydrophobizing agent and has an average particle size of 0.05 μm or more and 1 μm or less is used.SELECTED DRAWING: None

The present invention provides a mucoadhesive composition comprising: (a) non-neutralized diacidic form of lower alkyl vinyl ether-maleic acid copolymer, (b) sodium carboxymethylcellulose (Na-CMC) polymer, (c) water-insoluble, water-swellable, cross-linked polyvinylpyrrolidone (PVPP) polymer, (d) at least one di-valent (M++) cation donor, (e) at least one neutralizer, and (f) at least one oral care ingredient. Further, the present invention also provides a method of in situ curing of mucoadhesive composition of claimed invention at the application site.

The present invention relates to a resin infiltrated ceramic and a preparation method therefor. The resin infiltrated ceramic comprises a ceramic blank and resin provided inside the ceramic blank and on the surface of same. The ceramic blank comprises polymethyl methacrylate modified sodium aluminum silicate. Raw materials for preparation of the resin comprise an acrylate-type resin monomer and polyhedral oligomeric silsesquioxane containing a methacrylate functional group. The resin infiltrated ceramic disclosed by the present invention has excellent mechanical properties, has fracture toughness, flexural strength and hardness which are similar to that of human teeth, and has the characteristic of low shrinkage, thus facilitating CAD / CAM cutting. Therefore, the resin infiltrated ceramic can be used as a dental material for crown and bridge prosthodontics.

The present invention provides an unfired zirconia composite and a dental mill blank, with which a dental prosthesis can be manufactured with a single sintering operation without a pre-sintering operation and which have appropriate strength to withstand machining. The present invention pertains to: an unfired zirconia composite composed of an unfired zirconia molded body and a resin, wherein the resin is embedded in the unfired zirconia molded body; and a dental mill blank including said unfired zirconia composite.

Disclosed are hardenable glass ionomer compositions including a first paste and a second paste, as well as methods of using the disclosed compositions. The first paste includes water, a polyacid, and a non-acid-reactive filler. The second paste includes water, an acid-reactive filler, and non-agglomerated, water-miscible nano-sized silica particles having at least 25% surface coverage of the particles with silane. The compositions are essentially resin-free. In some embodiments, the water content of the first paste and the second paste of the paste / paste GI compositions disclosed herein is less than 20% by weight, based on the total weight of the composition.

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.

To provide a dental porcelain paste that can maintain a consistent paste form even during long-term storage and produces almost no carbonization or bubbles during firing, even when containing organic components.SOLUTION: This dental porcelain paste, used for making dental prosthetic devices, includes a base glass (a) with an average particle size (D50) of 1-20 μm, hydrophobic silica particles (b) with an average primary particle size of 1-50 nm, an organic solvent (c) with a boiling point of 100-300°C, and inorganic salts (d).SELECTED DRAWING: None

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 invention relates to a preparation method and application of a tooth antibacterial and mineralized dual-function anti-caries material. The anti-caries material provided by the invention comprises two components, namely a mineralizing solution I and a mineralizing solution II. The mineralization liquid I contains polyelectrolyte and soluble salt of antibacterial metal cations; and the mineralization liquid II contains phosphate and fluoride. The pH values of the two mineralizing solutions are both 9.5 + / -0.5. During use, the surface of a demineralized tooth is firstly cleaned, the mineralizing liquid I and the mineralizing liquid II are sequentially coated, flushing is performed after each action for 15 minutes, 1-3 cycles are performed every day, and continuous treatment is performed for 7-14 days. Through polyelectrolyte template guiding and antibacterial metal ion doping, a biomimetic mineralization layer with an antibacterial function is formed on the surface of the demineralized tooth, and the dual functions of antibacterial and remineralization are achieved. The material can significantly recover the mechanical properties of teeth, the elastic modulus and hardness recovery rates respectively reach 68.6% and 62.5%, the dental caries score is reduced by 70% or more, and the dental caries prevention material has an excellent dental caries prevention effect and a clinical application prospect.

The invention provides a preparation method of a multilayer zirconia false tooth and the multilayer zirconia false tooth, and the preparation method of the multilayer zirconia false tooth comprises the following steps: dividing a target false tooth into a plurality of tooth layers, and determining a powder formula of a reference layer in the plurality of tooth layers; by taking the powder formula of the reference layer as a reference, determining powder formulas corresponding to other tooth layers except the reference layer in the plurality of tooth layers; preparing powder of each tooth layer according to the powder formula of each tooth layer; and spreading the powder of each tooth layer into a mold according to a preset sequence, compacting, and processing to obtain the multilayer zirconia false tooth. According to the invention, the powder formula of the reference layer in the plurality of tooth layers is determined, and the powder formulas of other tooth layers are determined based on the powder formula of the reference layer, so that after the zirconia porcelain block is divided into multiple layers, the color of each tooth layer is not easy to deviate on the whole tooth.

The invention relates to the technical field of hydrogel synthesis, in particular to an anti-swelling underwater pressure-resistant supramolecular polyvinyl alcohol hydrogel membrane material as well as a preparation method and application thereof. The compression strength of the polyvinyl alcohol hydrogel prepared by the method is 25-50 Mpa, the polyvinyl alcohol hydrogel has plasticity and relatively high mechanical strength, the volume of the gel is basically unchanged before and after swelling, and the swelling mass change rate is less than 3%; the product can be stably used in a solvent environment or seawater for a long time. The hydrogel prepared by the invention is low in toxicity, has controllable swelling resistance and compression resistance, and can be applied to key materials requiring long-term dimensional stability and mechanical reliability in environments such as a dynamic wet environment and a precise living body; such as a precise marine equipment antifouling substrate, a deep sea stable sealing member, a bearing area bone repair implant or a biological-marine cross interface device.

The problems to be solved are to provide a particle material that can be used as a filler of a dental material and to provide a dental material that uses the particle material.　This particle material, which overcomes the aforementioned problem, is an aggregate containing silica primary particles having a volume-average particle size of 1-20 nm, said aggregate having in the interior thereof primary particles of two or more types of metal elements, and comprising a metal oxide in which one or more of the metal elements is a heavy element having an atomic number of at least 38, the particles of the heavy-element metal oxide being composed of primary particles having a volume-average particle size of 1–20 nm, and the surface of said primary particles being composed of silica, wherein the specific surface area is 180 m2 / g or less, the amount of linseed oil absorbed per unit volume (100 cm3) is 200 g or less, the the amount of linseed oil absorbed per unit surface area (m2) is 0.02 g or less, the light transmittance exceeds 10%, and the mass of the heavy elements is 4–60% based on the total mass. By using these aggregates, it is possible to achieve optical performance similar to that achieved with a small particle size while improving strength.