39results about How to "Low polymerization shrinkage" patented technology

The present invention refers to dental self-curing resin compositions having enhanced mechanical and physical properties. In particular, the present invention relates to dental self-curing resin compositions consisting of (i) a Paste A composition containing the multifunctional prepolymer mixture of 2,2-bis-[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]propane (“Bis-GMA”) and multifunctional prepolymer formed by substituting hydrogen atoms in hydroxyl group with methacrylate groups in the Bis-GMA molecules, and further containing a diluent, an adhesive monomer, a polymerization initiator, a polymerization inhibitor, a light stabilizer, an antioxidant, an inorganic pigment and an inorganic filler; and ii) a Paste B composition containing the same prepolymer mixture in the Paste A composition, and further containing a diluent, an adhesive monomer, a reductant, a polymerization inhibitor, a light stabilizer, an antioxidant, an inorganic pigment and an inorganic filler. The composition according to the present invention has better physical and mechanical properties than that of conventional compositions and is an ointment-ointment system able to be conveniently used.

The invention discloses a dental filling composite resin using a silicon dioxide nano-fiber as a filler. The resin is prepared from the following raw materials in percentage by mass: 18-22 percent of bisphenol A-glycidyl methacrylate, 4-16 percent of triethylene glycol dimethacrylate, 0.5-1 percent of camphorquinone, 0.5-1 percent of ethyl 4-N,N-dimethylaminobenzoate and 60-75 percent of silicon dioxide nano-fiber. The preparation process is simple and easy to operate, the raw materials are easily available at relatively low price, and the prepared composite resin has excellent physical mechanical performance, good abrasion resistance and long service life, has the characteristics of light color, low polymerization shrinkage and the like, and is expected to be used in clinical application.

The invention relates to a radically polymerizable monomer of formula (I)

wherein

• W¹ and W² in each case independently represent H or X—R—Y—PG, wherein at least one of W¹ and W² represents X—R—Y—PG,
• X in each case independently is missing or represents an ether, ester, amide, urethane or urea group,
• Y in each case independently is missing or represents an ether, ester, amide, urethane or urea group,
• R in each case independently is missing or represents a C₁-C₁₆ alkylene radical which can be interrupted by one or more O atoms, wherein R can be missing only if X and/or Y is simultaneously also missing, and
• PG in each case independently represents a cyclic, ring-opening polymerizable group,
• a, b, c and d independently of each other can take the values 3 to 10.

The invention also relates to polymerizable compositions which comprise the monomers according to the invention, as well as their use as dental materials and for the preparation of dental materials, in particular composites, cements, adhesives or coatings.

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.

The invention relates to a dental composite resin material with a low polymerization shrinkage rate, which belongs to the technical field of composite resin materials for repairing or remaking tooth. The dental composite resin material is formed in a mode that a composite resin monomer mixture is mixed with inorganic filler. The composite resin monomer mixture consists of a macro monomer, an acrylate monomer with a vinyl as an end group, an acrylate monomer containing two double bonds and an initiator. The macro monomer is an aromatic polyester low polymer with two or three double bonds. In the invention, the macro monomer is added into the composite resin material; and the macro monomer has the characteristics of low viscosity, high molecular weight and the like, so that the using amount of the inorganic filler can be increased and the polymerization shrinkage rate can be reduced, and thus, the edge micro leakage caused by volume shrinkage in the polymerization process of the materials is reduced and the occurrence probability of secondary caries is reduced.

The invention provides a resin ribbon composite for filling a tooth. The resin ribbon composite for filling the tooth has a low solidified volume shrinkage rate, a high filler filling rate and good polishing performance and high intensity required by bearing filling. Methacrylate resin monomer, structural filler with the average grain diameter varying from 0.04 mu m to 0.4 mu m, and prepolymerized smash filler with the average grain diameter 32 mu m are mixed. In order to improve machining and mechanical property, generally the used prepolymerized filler is grinded to have the average grain diameter which is smaller than 32 mu m. The resin ribbon composite for filling the tooth further has structural filler with the average grain diameter smaller than 0.4 mu m and superfine filler with the average grain diameter smaller than 0.04 mu m.

The invention discloses a low shrinkage light-cured composite resin for dental restoration and a preparation method thereof. With multifunctional structural advantages, cage-like silsesquioxane can cooperate with an expansion monomer, resin matrix, silanized silica and other components to form a three-dimensional network structure during polymerization so as to reach the purposes of lowering polymerization shrinkage of the material and improving mechanical properties, etc. The preparation method consists of: stirring the components evenly to obtain uncured composite resin, then conducting ultrasonic dispersion, vacuum debubbling, pouring into a mold, visible light curing and other steps, thus obtaining the low shrinkage dental composite resin. The used cage-like silsesquioxane and spiro ortho expansion monomer are both liquid, and have good compatibility with composite resin, and a good dispersion effect can be achieved without introducing a solvent, the added cage-like silsesquioxane provides a network crosslinking point for the system, while the polymerization shrinkage of the composite resin is reduced, the mechanical properties of the material are improved, and the water absorption and solubility are reduced.

To provide an organic-inorganic composite filler containing; a polymerizable monomer (a) having at least one functional group selected from the group consisting of —OH group, —NH— group, and —NH₂ group, a polymerizable monomer (b) having no functional group selected from the group consisting of —OH group, —NH— group, and —NH₂ group, a polymerization initiator (c), an inorganic filler (d), and a silane compound (e) which generates —OH group by hydrolysis.

The invention discloses a dental material combination. The dental material combination is characterized by comprising a carbamate (methyl) acrylate compound (A), a photopolymerization initiator (B) and a filler (C). The dental material combination is small in polymerization shrinkage during solidification, transparency of a solidified object formed by solidifying the dental material combination can be ensured, and the dental material combination is excellent in attractiveness and can be used for fully or partly replacing the natural tooth.

The invention relates to a hardenable multi-part liquid acrylic composition. The composition comprises a storage stable liquid first part, a storage stable liquid second part and optionally, a third or further liquid parts. The parts are operable to form a cement which hardens to a solid upon mixing of the parts together. The composition comprises an acrylic monomer component, an initiator component, acrylic polymer particles and a radiopacifying filler. The initiator component is present in an amount of effective to polymerize the acrylic monomer component upon being mixed and/or activated therewith. At least some of the radiopacifying filler is encapsulated within and/or adsorbed on the acrylic polymer particles in a liquid part. The invention extends to an at least twin barreled syringe or caulking gun accommodating the multi-part composition, a method of producing the multi-part composition, a composition for use as bone cement composition or in dental repairs, a liquid composition comprising a first sub-population of emulsion or non-emulsion polymerized acrylic polymer particles and radiopacifying filler encapsulated and/or adsorbed in the first sub-population of acrylic polymer particles and bone cement compositions or dental compositions.

The invention discloses a dental CAD/CAM removable denture layered machinable resin block, which is characterized in that the dental CAD/CAM removable denture layered machinable resin block comprises an upper layer block and a lower layer block, the upper layer block is used for engraving teeth, the lower layer block is used for engraving gingiva, the upper layer block is made of dental cutting resin, and the lower layer block is made of base plate PMMA resin. The dental cutting resin comprises bisphenol a dimethacrylate, UDMA, PMMA, a solvent, a curing agent, a coupling agent and a filler, through the arrangement, PMMA can be partially dissolved in a Bis-GMA resin matrix, the compatibility with the resin matrix is good, a three-dimensional network structure is formed after photopolymerization, the structural strength is improved, and the performance of a tooth part meets the physical and chemical performance requirements required by false teeth. The invention further discloses a preparation method of the layered machinable resin block for the dental CAD/CAM removable denture.

The invention provides a low polymerization shrinkage dental composition and a polymerizable dental material selected from the group consisting of wax-like dental material that undergoes ring open polymerization. The dental composition is useful as restorative material and for making artificial teeth, dentures, restoratives, crowns and bridges of high strength dental polymeric material.