Abstract: Dental compositions based on an bifunctional or polyfunctional acrylic-acid and/or methacrylic-acid esters, which contain an initiator system for radical polymerization and which additionally contain a compound of the general formula ##STR1## in which: Ar represents aryl or substituted aryl,R.sup.1, R.sup.2 and R.sup.3 represent hydrogen, aryl or substituted aryl, straight-chain or branched chain C.sub.1-18 -alkyl, C.sub.1-18 -alkoxyl or C.sub.1-17 -alkoxycarbonyl, in which alkyl and alkoxyl can be substituted by halogen or aryl,in which, R.sup.1 or R.sup.2, when represented by aryl or substituted aryl, C.sub.1-18 -alkyl or C.sub.1-18 -alkoxyl, can be linked with Ar by a single-bond andin which, Ar, when represented by phenyl, C.sub.1-18 -alkylphenyl, C.sub.1-18 -alkoxylphenyl, carboxyl-C.sub.1-17 -alkylphenyl or halogenphenyl, R.sup.2 can be represented by --O--, which is linked with the phenyl or phenyl moiety of Ar to a benzofuran, andin which at least one of R.sup.1 to R.sup.

Abstract: Dental compositions based on an at least bifunctional or polyfunctional acrylic-acid and/or methacrylic-acid esters, which contain an initiator system for radical polymerization and which additionally contain a compound of the general formula ##STR1## in which: Ar represents aryl or substituted aryl,R.sup.1, R.sup.2 and R.sup.3 represent hydrogen, aryl or substituted aryl, straight-chain or branched chain C.sub.1-18 -alkyl, C.sub.1-18 -alkoxyl or C.sub.1-17 -alkoxycarbonyl, in which alkyl and alkoxyl can be substituted by halogen or aryl,in which, R.sup.1 or R.sup.2, when represented by aryl or substituted aryl, C.sub.1-18 -alkyl or C.sub.1-18 -alkoxyl, can be linked with Ar by a single-bond andin which, Ar, when represented by phenyl, C.sub.1-18 -alkylphenyl, C.sub.1-18 -alkoxylphenyl, carboxyl-C.sub.1-17 -alkylphenyl or halogenphenyl, R.sup.2 can be represented by --O--, which is linked with the phenyl or phenyl moiety of Ar to a benzofuran, andin which at least one of R.sup.1 to R.sup.

Abstract: A dental material in powder form and being based on(a) aluminum fluorosilicate glass,(b) base metals suitable for dental use, or alloys of these with each other, and optionally(c) dry polycarboxylic acid and/or(d) a chelating agent,which contains at least some of constituent (a) as a sintered mixture with constituent (b).

Abstract: In the process disclosed, medical molding materials are treated with an aqueous solution of a disinfectant which contains, in addition, 0.1 to 15 wt.% of a soluble alcohol. This ensures high dimensional stability and good surface quality of the mold, even in the case of critical molding materials as alginates.

Abstract: The invention relates to a process for the treatment of dental impressions of conventional molding material, in which the surface of the impressions is treated prior to filling with plaster with an aqueous solution which contains 0.01 to 10 % by weight of a fluorine compound. The detrimental effect which the surface-active substances adhering to the dental impressions have on the surface finish of the plaster models which are produced using the dental impressions is thus eliminated.

Abstract: Photopolymerizable dental compositions are proposed which are curable with visible light and which apart from usual auxiliary substances and additives contain polymerizable monomers of the group of the poly-thiol compounds and of the group of the poly-ene compounds and a photoinitiator and which, in order to obtain a curing free from any smeary layer, contain at least 10% by weight poly-thiol compound(s), at least 10% by weight poly-ene compound(s) and 0.01 to 5% by weight of at least one acyl phosphine compound as photoinitiator. The compositions can advantageously be used as dental impression compositions.

Abstract: A polyether-impression material comprising components(a) a polyether, which has at least two optionally substituted vinyl- and/or allyl-end groups,(b) an SiH component,(c) a platinum catalyst, and optionally(d) the usual additivescharacterized in that the SiH-component (b) can be obtained by the reaction of at least a bi- functional, or polyfunctional, e.g., trifunctional, allyl- or vinyl-hydrocarbon compound, the hydrocarbon radical of which, without taking account of the allyl- or vinyl-groups and the optionally present alkylene ether groups, has 6 to 30 C-atom and contains at least one aromatically unsaturated, heterocyclic, or cycloaliphatic ring, with at least one mole per vinyl- or allyl-group of at least a bifunctional, or polyfunctional, e.g., trifunctional, SiH compound of the formula: ##STR1## in which e=0 to 8,g=0 to 8,h=0 to 4 andR.sup.4 and R.sup.10 are the same or different, and are each H, methyl or ethyl, with the proviso that at least 1 and at the most 5 of R.sup.4 to R.sup.

Abstract: A molding composition for making casting patterns is described containing(a) 10-99.89, preferably 20-90%, by weight of at least one di or polyfunctional acrylic acid and/or methacrylic acid ester which burns without residue,(b) 0.01-5% by weight of an initiator system which can initiate the radical polymerization and(c) 0-80, preferably 10-70%, by weight of organic fillers, pigments and other auxiliary substances burning without residue,the quantity particulars each being related to the total amount of (a)+(b)+(c), characterized in that it further contains(d) 0.1-30, preferably 1-20%, by weight with respect to the component (a) of a chemically inert organic compound burning without residue and having a boiling point and/or sublimation point in the range >150.degree. C.This molding composition is distinguished by not causing any faults in the casting jacket, in particular no crack formation, on burning out of the mold.

Abstract: Polymerizable compositions are described on the basis of (meth)acrylic acid esters which contain as filler a precipitation polymer that is formed from acrylic acid esters and/or methacrylic acid esters, and possibly other copolymerizable monomers, with 10 to 100 mol % of the (meth)acrylic acid esters being bi or polyfunctional. These compositions are particularly suitable as dental compositions.

Abstract: A shapable material is disclosed which contains:(a) an aluminum fluorosilicate glass;(b) at least one polycarboxylic acid having an average molecular weight greater than 500;(c) a carbonate and/or hydrogen carbonate in an amount of at least 0.1% by weight, based on (a);(d) optionally a chelating agent; and(e) optionally water.Said material is especially suited as bone replacement material and can be shaped into porous articles.

Abstract: A device for repairing damages caused by stones on windshields comprises a syringe (10) the discharge opening (14) of which is inserted into an applicator (11) adhesively affixed to the windshield (29) by means of a sealing disk (12). The syringe (10) is pre-filled by the manufacturer with a predetermined amount of a liquid synthetic resin which is curable by light. By retracting the syringe plunger (17), a vacuum is created for removing air and moisture that may have penetrated into the damaged portion (30). In its rearmost position, the plunger (17) exposes a vent hold (23) formed in the wall of the syringe casing (13) so that the resin will then be urged into the damaged portion (30) by the ambient atmospheric pressure.

Abstract: For the attachment of components using the SMT method a procedure is suggested in which the adhesive used is activated prior to fitting of the components to the circuit board by irradiation with light having a wavelength in the range of 200 to 600 nm to such an extent that the desired initial tackiness is maintained and there is no formation of skin on the surface of the adhesive. This makes it possible to cause the adhesive composition to fully cure in a shorter time and at lower temperature than has been possible so far without the wettability of the adhesive during the fitting of the components to the circuit board being impaired.

Abstract: A two part impression material comprising a first part comprising a product of the reaction of an alpha, beta-ethylenically unsaturated dicarboxylic acid anhydride and a liquid polydiene resin and a second part comprising a setting agent for the reaction product which setting agent is an alkoxylated fatty monoamine or an alkoxylated fatty polyamine having from 2 to 30 moles of alkoxylate per mole of the fatty amine, the alkoxylate groups being one or more alkoxylates selected from the group comprising ethoxylate, propoxylate and butoxylate, the first part and/or the second part also comprising an organic liquid which is incompatible with both the setting agent and the reaction product. A method of taking a dental impression using the reaction product of the first and second parts of the two part dental impression material is also disclosed.

Abstract: A mixer for dental capsules has a fork-type capsule holder which includes a pair of rigid arms (1, 2) one of which is provided with a pin (10) that passes through an opening (11) provided in the other arm (1). A helical spring (13) disposed about the pin (10) creates a tilting moment about the capsule holding location which causes the pin (10) to be caught by edges forming the opening (11), thereby producing a self-locking action which is not released during the mixing movement. For inserting and removing a capsule (5) in the inoperative condition of the mixer, the fork may be readily opened by pulling a handle (16) provided on the one arm (2) against the relatively weak force of the spring (13).

Abstract: A polymerizable, radiopaque dental composition including: one or more ethylenically unsaturated, polymerizable monomer and/or polymer, possible conventional fillers, pigments, initiators, activators, and thixotropic auxiliary material, as well as, in addition, a heavy-metal fluoride with very low solubility selected from the group consisting of complex heavy-metal fluorides having the general formula M.sup.II M.sup.IV F.sub.6, where M.sup.II is a calcium, strontium, or barium ion, and M.sup.IV is a titanium, zirconium, or hafniun ion. These filler compositions exhibit excellent X-ray visibility along with excellent optical properties.

Abstract: An ionogenic compound, soluble or dispersible in aziridine compounds is utilized for delaying the polymerization of aziridine compounds initiated by a sulfonium salt. Said ionogenic compounds contain an anion which is more nucleophilic than the anion present in the sulfonium salt employed. Moreover, a preparation for dental purposes is described which contains these components.

Abstract: An electric lamp for the photopolymerization of dental materials is supplied with constant electric power so that constant light output is obtained. The control circuit used to this end operates with a triac (3) connected between an a.c. voltage supply (2) and the lamp (1), said triac being controlled by signal values stored in a read-only memory of a microprocessor (4). Said stored values are respectively allocated to pairs of instantaneous values of lamp current and lamp voltage, the instantaneous values being detected in each cycle of the a.c. supply voltage and being utilized to address the read-only memory.

Abstract: An irradiation apparatus for curing photopolymerizable dental fillings in situ comprises a lamp 10 for producing a convergent light beam with a convergence angle .alpha.E smaller than about 30.degree. with respect to the optical axis, and an optical wave guide 15 having an entrance surface 14 disposed in the light beam and an exit surface 16. The wave guide 15 is conical with a diameter decreasing from the entrance surface 14 to the exit surface 16 and has a refractive index of approximately .sqroot.2. At the exit surface 16, radiation of constant density and high intensity is produced within a substantially semi-spherical lobe, so that even such dental parts which are difficult to access can be irradiated and penetrated with high intensity radiation.

Abstract: A metering device for dispensing a flowable substance from a container 10, in which a piston 11 with a piston rod 12 having a toothed portion 16 is disposed, includes a socket 17 adapted to be fixed to the container 10, an actuation lever 18 pivotal relative to the socket 17, a return spring 19 biassing the lever 18 to its rest position, an indexing detent 20 for advancing the piston rod 12 upon depression of the lever 18, and a retaining detent 21 for retaining the piston rod 12 in its respective position when the actuation lever 18 is released. The socket 17, actuation lever 18, reset spring 19, indexing detent 20 and retaining detent 21 are formed as one integral part injection-molded from synthetic resin. The socket 17 includes a slide 25 for fixing the part to a flange 14 provided at the rear end of the container 10.

Abstract: A polymerizable, radiopaque dental composition comprising including: one or more ethylenically unsaturated, polymerizable monomer and/or polymer, possibly conventional fillers, pigments, initiators, activators, and thixotropic auxiliary material, as well as, in addition, a heavy-metal fluoride with very low solubility selected from the group consisting of YF.sub.3 and complex heavy-metal fluorides having the general formula M.sup.II M.sup.IV F.sub.6, where M.sup.II is a calcium, strontium, or barium ion, and M.sup.IV is a titanium, zirconium, or hafniun ion. These filler compositions exhibit excellent X-ray visibility along with excellent optical properties.