Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Toyota Motor Europe

Baden-wurttemberg Stiftung Ggmbh

Carsten Gellermann

Herbert Wolter

Gerhard Schottner

Werner Storch

Joern Probst

Frank Hutter

Karl Mandel

Martin Kilo

Doris Hanselmann

Konstantinos Gkagkas

Yusuke Morita

Uta Helbig

Karl-Sebastian Mandel

Thilo Brämer

Wulf Brämer

Sofia Dembski

A dental composite containing a nanoparticulate filler has a resin matrix with structural element (Ib) R is an open-chain and/or cyclic alkylene, arylene, or alkylene arylene with 1-10 C, optionally modified by oxygen, sulfur, carboxyl or amino, Ris an open-chain and/or cyclic alkylene, arylene, or alkylene arylene with 1-10 C, optionally modified by oxygen, sulfur, carboxyl or amino; R' is an open-chain and/or cyclic alkyl, alkenyl, aryl, alkyl aryl, or aryl alkyl with 1-20 C; B and B&#x2032; are identical or different and are a straight-chain or branched organically polymerizable group with (meth)acrylate residue; Rare identical or different and a bond to another Si or hydrogen, alkyl with 1-10 C, or a bond to another metal atom; a is 1 or 2 and b is 0 or 1.

Tough, long-lasting dental composites

The invention relates to spherical or approximately spherical ionomer particles, comprising an inner area and an outer area which contains silicon ions. The cations of said outer area comprise a) at least one element which can occupy lattice sites of the silicon in silicate compounds, producing a negative excess of charge and b) at least one element which is selected from the elements of the first and second main groups and those that can appear in a divalent form and which can compensate for the negative excess of charge. Suitable methods for producing the inventive particles are all those methods for producing spherical or approximately spherical particles from a suspension dispersion, emulsion or similar and separating them from the surrounding solvent. Aerosol methods and especially, spray drying of suitable solutions, gels, sols or dispersions/suspensions can also be used. The inventive ionomer particles are especially suitable for use with acid-containing matrices as cements which can be used advantageously in dentistry for example.

Spherical ionomer particles and production thereof

The invention relates to spherical particles having a size between 5 and 10,000 nm and containing either SnO.sub.2 or SnO.sub.2 and at least one further oxide of the elements from the 1.sup.st to fifth main groups and/or the transitional metals, the oxides also being capable of containing organic groups. A particle surface is modified with organic groups and a SnO.sub.2 content of the particles lies between 0.1 and 99% by weight.

Spherical particles on the basis of metal oxides, method for its

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Gerbrunn, Germany

Carsten Gellermann