Bayer Aktiengesellschaft

Hans H Schulz

Wolfgang Podszun

Carlhans Suling

Michael Walkowiak

Bernhard Leusner

Kuno Wagner

Walter Uerdingen

Horst Jonischkeit

The device for spraying on a dental impression compound consists of a cylindrical handpiece (1) with a cartridge (5), situated inside it, for the provision of the impression compound, a curved and conically tapering headpiece (3), which can be mounted on the handpiece (1) by means of a bayonet joint or screw joint (2) and has a likewise conically tapering tubular cross-section (4), and a spray nozzle which is arranged on the headpiece (3) and designed as a two-phase nozzle (9, 10, 14). The supply of the impression compound to the spray nozzle takes place by means of an elastic hosepiece (7), at the front (distal) end of which a conical or pyramidal nozzle member (9) is arranged, which has air escape openings (11). At the same time the diameter of the nozzle member (9) must be greater than the smallest diameter of the conical tubular cross-section (4). The length of the elastic hosepiece (7) is dimensioned in such a manner that it is slightly compressed when the headpiece (3 ) is mounted, so that the nozzle member base (12) is pressed with its external periphery against the conical internal contour (4) of the headpiece (3).

Device and process for spraying dental molding compound

The present invention provides a two-component composition for use to form a solvent-free fixing material suitable for use in dentistry, which fixing material is liquid at room temperature and has a viscosity in the range of from 5,000 to 100,000 cP, said compositions having: a first component comprising at least one organic polyisocyanate with aliphatically and/or cycloaliphatically bonded isocyanate groups; and a second component comprising (a) at least one polyhydroxy compound having a molecular weight in the range of from 200 to 20,000, being substantially free of ether groups, and having at least 2 aliphatically bonded OH groups and (b) from 1 to 60% by weight, relative to the total mixture, of monohydric and/or polyhydric alcohols with a molecular weight below 200 and/or from 0 to 40% by weight, relative to the total mixture, of oligomeric polyesters containing at least 2 OH groups or ester-diols, with an average molecular weight of from 100 to 500, the first and second components of the mixture being present in amounts corresponding to a NCO/OH ratio of from 0.8:1 1.2:1.

Fixatives for dentistry and their use

A dental material is provided based on organic plastics in paste form, which consists essentially of (a) a polymerizable binder, (b) a crosslinked bead polymer and (c) a fine-particled inorganic filler.

Dental materials based on organic plastics in paste form

The invention provides dental materials which are opaque to X-rays and are based on organic plastics in paste form, which comprises (a) a polymerizable binder, (b) a crosslinked bead polymer and (c) an X-ray contrast medium. The materials can also contain as an additional component (d) a fine-particled inorganic filler which is not opaque to X-rays. The materials are useful, inter alia, for filing dental cavities.

Dental materials which are opaque to X-rays and are based on organic

Bead polymers having a mean bead diameter of from 10 to 200.mu. of one or more polymerized viscous methacrylates and/or dimethacrylates having a viscosity of from 0.5 to 500 Pa.s and, optionally, up to 20% by weight of one or more other vinyl monomers.

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Leichlingen, Germany

Hans H Schulz