Abstract: The adhesion of resin material to the solid substance of the tooth and to metals and metal alloys, for example, dental alloys, can be improved with a photo-polymerizable formulation containing hydroxyalkyl(meth)acrylates, urethanedi(meth)acrylates and, if applicable, esters of aromatic polycarboxylic acids possessing methacryloyloxy groups.

Abstract: A hand-operated polymerizer for the polymerization of synthetic materials, such as dental plastics. The polymerizer has a housing in which a light source and a fan are disposed, and which includes a light-emitting opening for emitting the light generated by the light source. The housing contains openings for permitting cooling air to enter the housing and for allowing heated air to exit the housing. In order to prevent the operator of the polymerizer from being impaired by heated air when operating the polymerizer, at least one air-conducting member is provided, wherein the position of the air-conducting member is changeable relative to the housing.

Abstract: Polymerizable aromatic carboxylic acids and carboxylic acid anhydrides with cyclic carbonate groups which are useful for improving adhesion of synthetic dental filling materials.

Abstract: A condensation product of a hydroxy(meth)acrylate compound corresponding to the formula ##STR1## in which R.sub.1 is hydrogen or methyl, A is a trivalent aliphatic residue with 3 to 15 C-atoms which is unsubstituted or substituted with OH groups and optionally contains up to 5 ether bridges, and an aromatic carboxylic acid anhydrides compound of the formula (II) or an aromatic carboxylic acid anhydride chloride compound of the formula (II) ##STR2## in which Ar is a benzene ring or a naphthalene ring, n is 1 or 2, and m is 0, 1 or 2. The condensation product has a molar mass of 300 and to 10,000 daltons. The condensation product is useful as an adhesive to bond dental filling materials to teeth.

Abstract: Polymerizable materials that contain "oxetanes" (trimethylene oxides) shrink only slightly when polymerized in the presence of a cationic polymerization catalyst. The materials are particular appropriate for coatings and for medical and dental purposes.

Abstract: A dental material that contains di- and poly(meth)acrylates and an inorganic filler in the form of a finely divided synthetic crystalline silicic acid with a sheet structure and optionally a very finely ground glass.

Abstract: A finely divided inorganic filler material is a sintered composite which consists of larger macro-filler particles of glass and of smaller micro-filler particles of glass or ceramics partially covering the macro-filler particle and firmly connected to it by sintering. Plastic materials reinforced with the filler are distinguished by improved abrasion resistance.

Abstract: A syringe having a bearing divided at least once in the axial direction of a threaded rod into bearing parts. The bearing parts are held at a distance from one another and at a distance from the threaded rod by at least one expanding part. The bearing parts, on their surfaces facing the threaded rod, have surfaces which can be brought by external pressure into engagement with the threaded rod against the resistance of the bearing parts.

Abstract: The invention relates to diacrylates and dimethacrylates having cyclic carbonate groups, and their use in dental materials.

Abstract: A syringe having a stopper configured at least partly as a membrane surface. The stopper is prestressed opposite to the direction of insertion of a rotary piston so that it assumes a stable position at rest. After displacement by the rotary piston, the membrane surface reversibly returns to this stable position after it is depressurized.

Abstract: A process for the production of a firmly adhering, moisture-proof coating of plastic on a substrate of metal, ceramic, glass, or polymer by the application of a liquid preparation containing water, solvent, a (meth)acrylate, and a reactive polymer and by solidifying this coating by heating it to a temperature above 100.degree. C. is described. A first preparation is applied to the substrate and at least partially dried; a second preparation is then applied to the partially dried first preparation and at least partially dried. Then the coating is heated to a temperature in the range of 150.degree.-400.degree. C. to solidify it.The first preparation contains:5-25 wt. % of an aqueous copolymer suspension, the copolymer consisting of a mixture of 40-80 wt. % of acrylonitrile and 60-20 wt. % of butyl acrylate;5-20 wt. % of water;35-75 wt. % of a polar solvent; and3-15 wt. % of a (meth)acrylate which is nonvolatile at temperatures of up to 250.degree. C.

Abstract: In the filling of a buccal area tooth, wherein a polymerizable dental material containing a cross-linked bead poller is filled into the tooth and permitted to set, wherein the bead polymer has an average particle diameter of 2 to 100 .mu.m an inorganic filler content of to 50% by weight and a degree of swelling of 50 to 2000%, measured in THF, and is synthesized fromA: 10 to 78% by weight of C.sub.1 -C.sub.2 -alkyl (meth)acrylateB: 5 to 10% by weight of C.sub.3 -C.sub.12 -alkyl (methacrylate)C: 1 to 30% by weight of cross-linkerD: 10 to 75% by weight of an inorganic filler, andE: 0 to 30% by weight of at least one other ethylenically unsaturated monomer.The cross-linked bead polymer is new, has a solid consistency, is storable and is especially useful for filling teeth in the buccal area.

Abstract: It has been found that silicone resins which contain alkoxy functional groups and harden rapidly in the presence of moisture allow suitable one-component formulations as provisional fixing materials. The hardening rate can be adjusted by addition of suitable activators.

Abstract: An artificial tooth of polymethacrylate, barium aluminum silicate glass and microfine silicon dioxide is described that imitates the natural tooth in its essential properties, namely mechanical strength and abrasion performance as well as transparency and depth of color. The tooth contains 15 to 35 weight % polymethacrylate, 35 to 75 weight % barium aluminum silicate glass with a mean particle size of from 0.1 to 5 micrometers, and 5 to 25 weight % silicon dioxide with a mean particle size of from 0.01 to 0.2 micrometers. In addition pigments necessary to match cosmetic requirements, are normally added as necessary.

Abstract: A syringe in which a discharge nozzle is connected to a cartridge of the syringe by ultrasonic welding. The discharge nozzle includes a triangular flow indicator configured to abut a triangular encircling groove located on the cartridge.

Abstract: A dispersion for producing an adhesive, waterproof and hydrolysis-resistant bonding layer for bonding metal, ceramics, glass and for polymer-plastic bonds, including a phenol resin-methacrylate dispersion containing phenol with free methylol groups, one or more mono- or multifunctional methacrylate compounds, dispersed acrylate, water and acetone.

Abstract: A dental furnace for heat treatment of dental materials and dental components, particularly for firing these at temperatures over 100.degree. C. comprises an insulated furnace space which can be closed off by a door. The furnace space has a housing which is suspended in an inner housing of metal; the inner housing is supported by a multi-part outer housing, and the door is pivotably fastened on the inner housing. In order to satisfy the requirements of firing at up to 400.degree. C., and to achieve a simple, cost-effective, and light construction, the furnance of the invention has a plastic outer housing, connected by securing elements to the inner housing; the plastic elements have a shell-shaped configuration, so that they define a hollow space surrounding the inner housing, at least adjacent the sidewalls of the outer housing. The hollow space serves as an insulator, minimizing the need for other insulating materials.

Abstract: A modular container for dental materials has an upper section (1) with a hinged top (13) and a lower section (2) composed of at least two superposed modules (3), each with two drawers (4). All sections feature interchangeable side panels (5) connected by aluminum sheet (6; 6') or the like, which is bent to form both a rear wall (8; 8') and a base element (7) or a cover element (20). The sheet metal is held between the side panel pair (5) by rails (32; 32'; 32") formed thereon. Similar rails (11; 11'; 11") formed on the inside of the front panels (25) engage around a laterally extending rim (22) at the front or back of each drawer; the drawers can be rotated front-to-back by attaching the front panel to the opposing edge. The upper section's cover is attached by hinges (12) which have rotational stops (14,15) for propping the cover in an open position.

Abstract: Radiopaque, abrasion-resistant tooth fillings and inlays that can be polished to a high gloss can be made from a dental material that, in addition to monomeric dimethacrylates, contains a filler mixture of 80 to 90 weight % barium aluminum silicate glass, having a mean particle size of 0.5 to 1.5 .mu.m, and 10 to 20 % weight silicon dioxide, having a mean particle size of 0.04 to 0.06 .mu.m. The dental material is also suitable for anchoring dental prostheses.

Abstract: Polymerization devices having an irradiation space in an irradiation chamber, the space being accessible via at least one pivotable or displaceable wall, and having a light conductor and a radiation source unit, wherein the light conductor feeds the radiation from the radiation source into the irradiation space of the irradiation chamber and forms a releasable connection between the irradiation chamber and the radiation source unit, are known.