2643results 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.

Devices configured for insertion into an oral cavity of a subject for delivery of an agent for a time period are described. The devices are comprised of at least two polymer shells that nest or stack to create a space or gap therebetween. The agent is placed in the gap and is released in a controlled fashion to deliver agent for the time period. Kits comprised of a device and optionally a refill of the agent are also described.

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 method for preparing a light-transmitting gradient multicolor zirconium oxide material through photocuring, which comprises the following steps: preparing modified aluminum oxide which is formed by attaching a strontium element and a chromium element to the surface of aluminum oxide; preparing bottom-layer slurry, middle-layer slurry and upper-layer slurry from the zirconium-aluminum powder; the bottom layer slurry comprises zirconium aluminum powder and a coloring agent; the middle layer slurry comprises zirconium-aluminum powder, a light-transmitting auxiliary agent and a coloring agent; the upper-layer slurry comprises zirconium-aluminum powder, a light-transmitting auxiliary agent and a coloring agent; preparing a bottom layer green body by using the bottom layer slurry through 3D printing by using the photocuring slurry, preparing a middle layer green body on the surface of the bottom layer green body by using the middle layer slurry, and preparing an upper layer green body on the surface of the middle layer green body by using the upper layer slurry, so as to obtain a zirconium oxide material green body; the light-transmitting gradient multicolor zirconia material with gradient light transmission and gradient color is directly prepared through 3D printing, the color of the light-transmitting gradient multicolor zirconia material is closer to that of real teeth, and the strength and toughness are not reduced.

The present invention provides an adhesive composition for stereolithographic articles and non-stereolithographic articles, possessing excellent adhesive properties to both objects fabricated by stereolithography and molded articles made by methods other than stereolithography. The present invention relates to an adhesive composition for stereolithographic articles and non-stereolithographic articles, comprising: a polyfunctional (meth)acrylic polymerizable monomer (A); and an organic solvent (B) having a normal boiling point of 120° C. or less, and a viscosity at 25° C. of 10 mPa·s or less, wherein the polyfunctional (meth)acrylic polymerizable monomer (A) comprises two or more polymerizable groups per molecule, and at least one selected from the group consisting of a urethane bond, an aromatic skeleton, and an amide bond, and the polymerizable groups of the polyfunctional (meth)acrylic polymerizable monomer (A) are (meth)acryloxy groups or (meth)acrylamide groups.

The invention provides an enamel veneering repair material and a preparation method thereof, and belongs to the technical field of ceramic forming products. In order to further improve the attaching property of a tooth veneering material, reduce the amount of abraded tooth tissues and reduce the risks of ceramic collapse and falling off. Zirconium oxide, aluminum oxide, hydroxyapatite, silica dimethylsilylate, silicon dioxide, fluorapatite, magnesium oxide, thermosetting acrylic resin, aluminum hydroxide gel, a silane coupling agent, polyvinyl alcohol, sodium phytate and the like are adopted as raw materials, all the components are matched according to a certain proportion, and a special technology is adopted for preparing the tooth patch. While good biocompatibility, high hardness and wear resistance are ensured, the adhesion can be further improved, the removal amount of tooth tissues by grinding is reduced, the risks of ceramic collapse and falling are reduced, the service life is prolonged, and better use experience is provided.

The invention provides a granulation raw material, a pre-sintered body, a zirconia porcelain block, a fast firing production method and application. The fast firing production method comprises the following steps: S1, providing a first zirconium oxide material and a second zirconium oxide material; s2, compounding the first zirconium oxide material and the second zirconium oxide material, and granulating together with an auxiliary material to obtain a granulation raw material; s3, obtaining a green body based on the granulation raw materials; s4, carrying out pre-sintering treatment on the green body to obtain a pre-sintered body; and S5, machining the pre-sintered body, and then carrying out fast firing treatment to obtain the zirconium oxide porcelain block. On the basis of compounding of granulation raw materials, the overall performance of the zirconia ceramic block can be improved while a pre-sintered body can be rapidly sintered.

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.

A cement is provided for use in medical and dental procedures. The cement includes a barium silicate compound, and is formulated to be biocompatible and bioactive. The barium silicate compound is in the form of a powder, and includes one or more of a di-barium silicate, a tri-barium silicate, a mono-barium aluminate, a di-barium aluminate, and a tri-barium aluminate. The cement can optionally be provided as a premixed paste in which the cement powder is mixed with a nonaqueous liquid.

A hardenable (e.g. dental) compositions is described comprising an encapsulated material. The encapsulated material comprises a basic core material and an inorganic shell material having certain viscosity criteria. Also described are dispensing devices and kits are described comprising a hardenable (e.g. dental) composition comprising a liquid material and an encapsulated material wherein the encapsulated material comprises a basic core material and an inorganic shell material comprising a metal oxide surrounding the core. The dispensing devices and kits can facilitate the methods of applying the hardenable composition. The hardenable or hardened (e.g. cured) composition can provide various technical effects such as a delayed release of a basic core material, a delayed increase in basicity, promoting remineralization of a tooth or bone structure, and increasing the average alkaline phosphatase (ALP) activity of pulp cells. In some embodiments, the composition is a dental (e.g. sealant) composition for application to a tooth structure.

The present invention relates to a dental zirconia material of which the surface is modified by plasma treatment, an implant, and a method for preparing same. The zirconia material and the implant prepared according to the present invention have improved cell adhesion and anti-bacterial effect, and thus can exhibit improved biocompatibility and minimize an inflammatory response of a user and the like.

Curable compositions comprise at least one (meth)acrylate monomer; silver; and a photoinitiator system. The photoinitiator system comprises at least one cyclic β-diketone represented by the formula (I) or a tautomer thereof, wherein: R1 represents H or an organic moiety having from 1 to 32 carbon atoms and optionally 1 to 12 heteroatoms selected from O, N, and combinations thereof; each R2 independently represents H or an aliphatic group having from 1 to 12 carbon atoms, and up to two of oxygen and sulfur atoms; and n represents 1, 2, or 3; and at least one Type II photoinitiator. Methods of making and using the compositions are also disclosed.

The present invention relates to a dental 3Y-TZP zirconia material whose surface is modified by plasma treatment, an implant and a manufacturing method thereof. The 3Y-TZP zirconia material and implant manufactured according to the present invention have improved cell adhesion and antibacterial effects, thereby improving biocompatibility and minimizing inflammatory reactions of the user.

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.

The invention belongs to the technical field of biomedical oral materials, and relates to novel POSS (Polyhedral Oligomeric Silsesquioxane) and a preparation method thereof as well as oral rehabilitation low-shrinkage composite resin as well as a preparation method and application thereof. The invention relates to a novel POSS (polyhedral oligomeric silsesquioxane) preparation method, which comprises: mixing trimethoxy [2-(7-oxabicyclo [4.1. 0] hept-3-yl) ethyl] silane, silane containing double bonds and an organic solvent, carrying out a hydrolysis-polycondensation reaction to obtain a liquid material, and carrying out liquid separation, suction filtration, washing, rotary evaporation and drying to obtain the novel POSS. The prepared novel POSS with the reaction double bonds and the epoxy shrinkage groups is good in biocompatibility and stability and has the remarkable low shrinkage characteristic and hydrophobicity, the low-shrinkage composite resin for oral cavity restoration prepared from the novel POSS as a functional component can remarkably reduce the polymerization shrinkage rate of the composite resin and reduce water permeation under the condition of a low addition amount, and the composite resin can be used as a functional component for oral cavity restoration of the oral cavity restoration of the oral cavity restoration of the oral cavity restoration of the oral cavity restoration of the oral cavity restoration of the oral cavity restoration of the oral cavity restoration of the oral cavity. The stability of the composite resin is improved, and the composite resin can be widely applied to various oral resins.

An expansion-type root canal filling medical instrument combination based on tooth root tip biological sealing, and a use. The medical instrument comprises a sealant composition and a titanium material root canal obturating point; the sealant composition is composed of a liquid agent, component-A powder, and component-B powder that are isolated from each other before use, the component-A powder comprises 75%-95% of tricalcium silicate and 5%-25% of β-tricalcium phosphate, and the component-B powder is composed of 45%-55% of nano zirconium dioxide, 44.7%-52% of calcium hydroxide, and 0.3%-3% of calcium oxide; the surface of a root canal section (1) of the titanium material root canal obturating point is provided with a thread (102) tending to be horizontal, and a thread groove of the root canal obturating point is used for being filled with a prepared sealant; the surface of a dental crown section (2) is provided with a retention groove section. The medical instrument combination solves the problems of root canal treatment failure or poor long-term effect and the like caused by volume shrinkage after existing sealants and gutta percha points are filled, and can realize high-safety, high-biocompability, high-quality and high-density root canal filling.

The present invention relates to: a photocurable restoration composition comprising a ceramic composition; and a dental prosthesis using a 3D printer. More specifically, the present invention relates to: a photocurable restoration composition comprising a silane-treated ceramic composition; and a dental prosthesis manufactured using the photocurable restoration composition by using a 3D printer. According to the present invention, it is possible to obtain a dental prosthesis having improved gloss, excellent thermal resistance and hardness, and improved uniformity and reliability.

Disclosed herein are systems and methods for eradicating biofilms by killing bacteria within the biofilm, degrading the matrix, and removing biofilm debris. The disclosed subject matter provides techniques for administering a suspension of H2O2 and iron oxide nanoparticles to substantially eradicate bacteria within the biofilm matrix, degrading the biofilm matrix, actuating the iron oxide nanoparticles to assemble into a biohybrid robot suitable for removing biofilm debris, and powering the biohybrid robot to remove biofilm debris from accessible or enclosed surfaces. In some embodiments, the disclosed subject matter includes embedding iron oxide nanoparticles in a hydrogel to form a soft robotic structure, administering the soft robotic structure to a biofilm-covered site, and magnetizing the soft robotic structure to substantially eradicate bacteria within the biofilm matrix, degrading the biofilm matrix, and removing biofilm debris from enclosed surfaces.

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.

To provide a calcined body that is processed easier than a conventional calcined body and where differences in hardness between production lots are suppressed.SOLUTION: A calcined body comprises: at least one first transition metal element selected from the group consisting of manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), molybdenum (Mo), technetium (Tc), ruthenium (Ru), rhodium (Rh), palladium (Pd), and silver (Ag); a coloring element of at least one of a lanthanoid rare earth element and a second transition metal element different in kind from the first transition metal element; and zirconia containing a stabilizing element. A content of the first transition metal element is 100 mass.ppm or more, a content of the second transition metal element is less than 100 mass.ppm, and an absolute value of a difference in hardness relative to a hardness of a calcined body obtained from a commercially available powder is 10 HV or less.SELECTED DRAWING: None

The invention belongs to the technical field of dental materials, and particularly relates to resin with gradually-changed color and light transmittance, a preparation method and application of the resin and a false tooth simulating natural teeth. The resin with the gradually changed color and light transmittance is formed by hot pressing of multiple layers of materials; the light transmittance and chromaticity of each layer of materials are strictly controlled, the absolute value of the difference value of the light transmittance of every two adjacent layers of materials in the multiple layers of materials is 1-7%, and the absolute value of the difference value of the light transmittance of the first layer and the last layer is larger than 20%; the color difference value of two adjacent layers of materials in the multiple layers of materials is smaller than 1, and the color difference value of the first layer and the last layer is larger than 4. The resin with gradually changed color and light transmittance provided by the invention is natural in color transition, two adjacent layers are mutually fused, the resin can be used for manufacturing a whole false tooth and a complete false tooth, and the manufactured false tooth has the effect of gradually changing light transmittance and color and can better simulate the aesthetic effect of the cutting end and neck of a natural tooth.

A dental adhesive material kit may have desirable adhesive properties for tooth structure, and, while ensuring appropriate strength, may allow easy removal of excess cement in a semi-cured state created by temporarily applying light to excess portions of cement with a photoirradiator. Such a dental adhesive material kit may include a dental aqueous adhesive composition (A) and a dental curable composition (B), satisfying the inequality (I)0≤t2−t1≤3.0  (I),wherein t1 (min) is a contactual polymerization start time of the dental aqueous adhesive composition (A) and the dental curable composition (B), and t2 (min) is a polymerization start time of the dental curable composition (B).

The invention discloses an application of monocalcium aluminate in a premixed dental filling material, the premixed dental filling material and a preparation method of the premixed dental filling material, the premixed dental filling material takes monocalcium aluminate as a main hydraulic material, calcium oxide is supplemented as a curing accelerator and an expanding agent, and the premixed dental filling material can also comprise calcium pyrophosphate, calcium carbonate, calcium carbonate and calcium carbonate. The biological hydrogel paste with excellent injectable performance is prepared. The material keeps fluid under a sealed condition, and is hydrated, solidified and hardened after being placed in a physiological environment and contacted with physiological body fluid. According to the present invention, by using the excellent biocompatibility and the biological activity of the monocalcium aluminate, the premixed aluminate hydrogel dental filling material is prepared from the monocalcium aluminate, and can be used for medical applications and dental applications, including the fields of pulp capping, root canal therapy, hard tissue repair and the like.

The invention relates to the technical field of dental repair materials, in particular to a nano zirconia ceramic material for dental repair and a preparation method thereof. The preparation method comprises the following steps: S1, preparing nano zirconium oxide powder; s2, preparing composite spherical powder; s3, preparing a green body; and S4, high-temperature sintering: unpacking the hot-pressed green body, and performing high-temperature sintering to obtain the nano zirconia ceramic material for dental restoration. According to the present invention, the mechanical property, the biocompatibility, the antibacterial property, the aesthetic property and the like of the prepared nano-zirconia ceramic material for dental restoration are comprehensively improved through a variety of modification means and optimization processes, and the prepared nano-zirconia ceramic material becomes the ideal dental restoration material.

The invention provides a resin composition, a preparation method of the resin composition, light-cured resin and application of the light-cured resin, and the resin composition comprises the following components in parts by mass: at least two polymerizable acrylate derivatives; at least one acrylate monomer; at least one photoinitiator; at least two fillers; the filler is a silane modified filler; based on 100 parts by mass of the resin composition, the mass part of the filler is 2-30 parts. By adopting the silane modified filler, the bonding strength of the filler and a resin matrix can be enhanced, the wear resistance is improved, the wear resistance can be remarkably improved when the photocured resin is applied to a dental material, and the application prospect is wide.

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.

The invention discloses light-cured resin, a preparation method and application, and belongs to the technical field of light-cured 3D printing. The light-cured resin provided by the invention comprises the urethane acrylate oligomer, the modified acrylate oligomer and the reactive diluent, and the urethane acrylate oligomer can improve the toughness and reaction speed of the light-cured resin and reduce the volume shrinkage of the light-cured resin, so that the light-cured resin has good light-cured effect. The modified acrylate oligomer can improve the durability of the light-cured resin, adjust the hardness and toughness and reduce the volume shrinkage of the light-cured resin, and the reactive diluent can improve the hardness and toughness of the light-cured resin; the polyurethane acrylate oligomer, the modified acrylate oligomer and the reactive diluent are compounded, and the dosage of each component is limited, so that each component fully plays a synergistic role, and the light-cured resin has low volume shrinkage and high hardness, and keeps high toughness and durability at the same time.

The invention relates to a zirconium oxide ceramic block and a preparation method and application thereof, the zirconium oxide ceramic block comprises an inner zirconium oxide block and an outer zirconium oxide block wrapping the inner zirconium oxide block, and the outer zirconium oxide block comprises a plurality of zirconium oxide layers which are sequentially laid in the vertical direction according to the order of transparency; the thickness of the zirconium oxide layer with the maximum transparency and the thickness of the zirconium oxide layer with the minimum transparency are both greater than the thickness of the zirconium oxide layer between the maximum transparency and the minimum transparency; the transparency of the inner zirconium oxide block is the same as the maximum transparency of the multiple zirconium oxide layers, the bottom end of the inner zirconium oxide block is located in the zirconium oxide layer with the minimum transparency, and the height of the inner zirconium oxide block is not smaller than 2 / 3 of the height of the outer zirconium oxide block; meanwhile, the invention discloses a preparation method and application of the ceramic block. According to the invention, the structure, color and light transmittance of the tooth can be more truly close to those of a real tooth, the service life of the tooth is prolonged, and the use comfort is improved.

The present invention refers to a biomimetic minerizable 3D-printing ink, a method for the production of such a biomimetic minerizable 3D-printing ink, a method for the production of a biomineralized 3D-printed article, a biomineralized 3D-printed article as well as the use of a crystallization trigger which is an oligopeptide selected from the group comprising an oligopeptide of the HABP family and an oligopeptide of the P11-family for 3D printing.

A composite, three-dimensionally stable facing material for adding aesthetic features to a denture base. The composite may be a flexible, flat strip of material capable of being molded to gingival surfaces of the denture base and retained on the denture base. The strip is capable of being trimmed and then cured to a hardened state. Fibers and / or other characterization may be added for increasing realism of the denture gingival surfaces.