122 results about "Dental restorative materials" patented technology

The invention relates to a method and apparatus for color matching of slightly colored objects which are transparent, diffusing an absorbent, by acuminating a small error of the objects with a first bunch of optical fibers. A second bunch of optical fibers is used to pick up the light back scattered from the area of the objects. The second fibers are located inside of the illuminating fibers. The light is measured at 3 wavelengths that correspond to blue, green and red colors and the pigmentation of the object is calculated as a difference between the red and blue spectrum components. Presentation of the brightness is calculated to be proportional to the green spectrum component. The pigmentation and brightness is then compared with the same perimeters of a standard shape pallet. The invention is particularly suitable for color matching the teeth in the mouth with dental prosthesis and dental restorative materials.

The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and / or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.

Ceramic precursor powders are combined with a binder and pressed into blocks or similar shapes to form green bodies. The ceramic powders consist of fairly uniform particles thoroughly dispersed to be essentially free of agglomerates such that it will sinter predictably and isotropically without appreciable distortion. The green bodies may be soft-sintered to a bisque density less than about eighty five percent of the final density. The soft-sintered blocks are then milled to a desired shape and sintered to a final density rendering a high strength dental restorative material. The material may be aluminum oxide, partially stabilized zirconium oxide, mixtures of the two, mullite or any suitable oxide that may be sintered to high strength (i.e., greater than 250 MPa).

The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and / or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.

The invention relates to a blank for producing dental shaped parts, comprising a blank body (1) made of tooth restoration material, from which the shaped part can be machined using a tool (11, 12, 13, 14, 15) for removing material. The aim of the invention is to enable a reliable verification or recognition of the tool fitting or of the type and state of wear of the used tool of a machine tool for the blank. To this end, the blank has at least one gauge (4, 5), whose dimensions are such that the tool present for the machining can be identified by the gauge on the basis of its outer contour. The invention also relates to a method for producing dental shaped parts with a blank body made of tooth restoration material, from which the entire shaped part can be machined in a machining device by a tool for removing material. In order to enable a reliable verification or recognition of the tool fitting or of the type and state of wear of the used tool of a machine tool for the blank, the tool selected for the machining is, before its use, verified with regard to the outer contour thereof by using at least one gauge that is placed upon the blank.

The present invention is directed to dental compositions that can be used as adhesives for bonding a dental material to a dental structure surface and / or as a dental restorative material. The dental composition is preferably applied to a dental structure surface under conditions effective to etch the dental structure surface.

This invention describes compositions containing nano-crystalline apatite useful as bone—or preferably as tooth restorative materials. The materials produced, using the composition have improved properties in the areas of esthetics, hardness, translucency, surface polishability, strength and the capability to release and to take ions up in respect of a biological environment.

A mill blank assembly for a dental prosthesis includes a milling section and a support section for supporting the assembly in a milling machine. In certain embodiments, the milling section is adhesively bonded to the support section by a direct chemical bond that provides enhanced resistance to unintentional detachment of the milling section from the support section during a subsequent machining operation. Optionally, the support section includes a passageway that receives a quantity of flowable dental restorative material used to make the milling section, such that the restorative material that is located in the passageway provides additional resistance when hardened to unintentional detachment of the milling section from the support section.

A dental matrix band includes a body portion, having a fluoropolymer layer disposed thereon. The fluoropolymer layer reduces undesirable adhesion between dental restorative material and the matrix band. In one embodiment, the fluoropolymer is applied onto the body portion of a stainless steel matrix band in a layer having a thickness in the range of from approximately 0.0005 inches to 0.001 inches.

A method for producing a dental restoration wherein a tooth preparation area is scanned either directly or indirectly. The scanned data is used by a computer controlled milling machine to create two or more investment blocks (50, 52, 54) for preparing a suitable dental restoration, the investment blocks being of a material which may be used in ovens operating in a 800° to 1,200° C. range. A suitable dental restorative material (18) and the blocks are place in an oven, and after being clamped together, the material (18) is pressed or injected into the investment blocks to form the desired dental restoration. Subsequently, after cooling, the dental restoration is divested from the investment mold and finished.

A dental illumination device is provided that comprises a plurality of light-emitting diodes capable of emitting light of selected wavelengths that do not activate initiator molecules contained within dental restorative material such as dental composite, or at an intensity which is insufficient to initiate substantial polymerization of the dental restorative material. Typically, the dental illumination device produces light having wavelengths not in a range selected from 400 nm to 500 nm, 350 nm to 470 nm and below 350 nm to 420 nm. The dental illumination device may further comprise a switch that allows the aforementioned wavelengths to be switched off or reduced in intensity as required. The dental illumination device may operate as a stand-alone unit or may be fitted to an existing dental light.

The present invention discloses a dental restorative material comprising 10-50 mass % of (A) a polymerizable monomer, 5-80 mass % of (B) an organic-inorganic composite filler which is prepared by dispersing an inorganic fine filler having an average particle diameter of 1 μm or smaller in an organic matrix and has an average particle diameter of 5.0-50 μm, and 10-60 mass % of (C) a third component, i.e., an inorganic filler having an average particle diameter of 1.1-5.0 μm, wherein the absolute value of the difference between the refractive index [nC] of the inorganic filler (C) and the refractive index [nB] of the organic-inorganic composite filler (B) (i.e., |nC−nB|) is 0.005-0.07 at 32° C. and the absolute value of the difference between the refractive index [nA] of the cured product of the polymerizable monomer (A) and the refractive index [nC] of the inorganic filler (C) (i.e., |nA−nC|) is 0.005-0.05 at 32° C.

The invention relates to a blank for producing dental shaped parts, comprising a blank body (1) made of tooth restoration material, from which the shaped part can be machined using a tool (11, 12, 13, 14, 15) for removing material. The aim of the invention is to enable a reliable verification or recognition of the tool fitting or of the type and state of wear of the used tool of a machine tool for the blank. To this end, the blank has at least one gauge (4, 5), whose dimensions are such that the tool present for the machining can be identified by the gauge on the basis of its outer contour. The invention also relates to a method for producing dental shaped parts with a blank body made of tooth restoration material, from which the entire shaped part can be machined in a machining device by a tool for removing material. In order to enable a reliable verification or recognition of the tool fitting or of the type and state of wear of the used tool of a machine tool for the blank, the tool selected for the machining is, before its use, verified with regard to the outer contour thereof by using at least one gauge that is placed upon the blank.

A dental composite material that comprises a polyhedral oligomeric silsesquioxane is disclosed. The dental composite material is useful for a variety of dental materials, treatments, and restorative functions including crown and bridge materials, fillings, adhesives, sealants, luting agents or cements, denture base materials, orthodontic materials and sealants, and other dental restorative materials.

Improved methods for indirect bonding of orthodontic appliances, such as brackets, to the tooth surfaces of dental patients are provided. The methods use a transfer tray to accurately position the brackets on the tooth surfaces. Preferably, the tray is made of an ethylene vinyl acetate copolymer (EVA) / siloxane material. The brackets are coated with a protective coating to prevent them from becoming embedded in the tray. Preferably, a translucent, blue-tinted coating is used to cover the brackets. Dental restorative materials are used to bond the brackets to the teeth. The transfer tray is then removed from the mouth, while the appliances remain firmly bonded to the tooth surfaces.

The invention relates to a tooth repair material. The tooth repair material is zirconia enhanced lithium silicate glass ceramic; the zirconia enhanced lithium silicate glass ceramic comprises the following chemical components in percentages by mass: 10%-14% of ZrO2, 54%-67% of SiO2, 12%-25% of Li2O, 0%-10% of a coloring agent and 0%-15% of a stabilizer. The invention further provides the tooth repair material and application thereof. According to the tooth repair material as well as a preparation method and the application thereof, the lithium silicate glass ceramic is taken as a glass matrix, and by adding an appropriate amount of zirconia, the tooth repair material with good mechanical property and reliability can be obtained through high-temperature firing.

A blank and method for the production of dental shaped bodies in machining equipment having at least two tools located in the machining chamber of the machining equipment, including a corpus of tooth restoration material, from which the shaped body can be carved by means of at least one of at least two tools by material removal. The blank exhibits at least two gages, each of which is in the form of a recess, the geometry of which is such that the tool selected for the cutting operation can be recognized by means of at least one of the gages by reference to its outer contour, the at least two gages being disposed on the blank in such a way that they can be simultaneously engaged by the at least tools when the blank is clamped in the machining equipment for carving purposes.

A dental composite material that comprises a polyhedral oligomeric silsesquioxane is disclosed. The dental composite material is useful for a variety of dental materials, treatments, and restorative functions including crown and bridge materials, fillings, adhesives, sealants, luting agents or cements, denture base materials, orthodontic materials and sealants, and other dental restorative materials.

A dental restorative material including a photocurable composition that contains a polymerizable monomer component (A), an inorganic filler component (B) having an average particle size of not smaller than 0.07 μm, and a photo polymerization initiator (C),the inorganic filler component (B) being contained in an amount of 100 to 1500 parts by mass per 100 parts by mass of the polymerizable monomer component (A), andthe polymerizable monomer component (A) and the inorganic filler component (B) being so selected as to satisfy a condition (X1) represented by the following formulas (1a) and (1b):nF−0.005<nM<nF+0.005  (1a)nF+0.020<nP<nF+0.040  (1b)wherein,nM is a refractive index of the polymerizable monomer component (A) at 25° C.,nP is a refractive index at 25° C. of a polymer obtained by polymerizing the polymerizable monomer component (A), andnF is a refractive index of the inorganic filler component (B) at 25° C.

A method of restoring a tooth cavity is conducted by a direct or indirect method with a visible light curable nanocomposite of a dental restorative material with a low polymerization shrinkage, wherein the dental restorative material comprises an epoxy resin, inorganic oxide nano particles, a photoinitiator and a photosensitizer. The direct method involves the filling of the tooth cavity with the nanocomposite dental restorative material, stacking the nanocomposite dental restorative material in the tooth cavity, and curing with visible light followed by shaping and polishing. The indirect method involves making a mold of the tooth, casting the mold with the nanocomposite dental restorative material, curing with visible light followed by shaping and polishing, then removing the shaped and polished material and adhering it to the tooth cavity.

A method of forming a capsule assembly which includes radiation-reactive dental restorative material includes exposing selected portions of an exterior surface of the container to laser generated radiation at an energy level sufficient to create indicia on the exterior surface, with the indicia having a sufficient contrast relative to the exterior surface to enable readily visual human and / or optical machine-readable detection of the indicia. The indicia identify characteristics of the radiation-reactive dental restorative material in the container, the container is formed from a laser-enhanced (LE) polymer which is inert relative to the radiation-reactive dental restorative material within the container. The ability of the container to dispense the radiation-reactive dental restorative material under pressure is not adversely affected by the exposure of the container to laser generated radiation when creating the indicia on the exterior surface of the container. Optionally, the exposure of the laser-enhanced (LE) polymer to laser generated radiation is done at an energy level sufficient to create one or more raised protrusions on the container, useful for engaging a resilient cap adjacent an orifice on the container.

The disclosure provides a new photopolymerizable resin system for dental restorative materials. The resin system utilizes a thiol-ene component as the reactive diluent in dimethacrylate systems. The ternary resin system comprises a thiol monomer, an ene monomer and a dimethacrylate monomer. Use of an off-stoichiometric ratio of thiol:ene functional groups in favor of excess thiols results in enhanced overall functional group conversion, improved polymer mechanical properties, and reduced shrinkage stress of the ternary system when compared to either traditional dimethacrylate or thiol-ene resin systems.

The invention provides methods for inducing reversible chain cleavage of polymer chains in a crosslinked polymeric material or during polymerization of a polymeric material. Reversible cleavage of the polymer backbone is capable of relieving stress in the polymeric material as the bonds reform in a less stressed state. The invention also provides mixtures for making crosslinked polymeric materials, methods for making polymeric materials capable of reversible chain cleavage, materials made by the methods of the invention, and linear monomers containing reversible chain cleavage groups which are useful in the materials and methods of the invention. The mixtures of the invention may be dental restorative compositions used for forming dental restorative materials.

A process for preparing the fluorapatite (FAP) includes proportionally mixing calcium fluoride with hydroxyapatite, adding excipient, die pressing and sintering. It has high biological compatibility,so using it as biomedical material for curing teeth, etc.

The present invention provides a dental material, a dental material composition and a dental restorative material that exhibit small polymerization shrinkage particularly during curing and are producible at low cost on the industrial scale. The dental material of the present invention includes a specific urethane (meth)acrylic compound represented by Formula (1) described below.