Use of compositions based on organically modified silicic acid polycondensates for coating teeth and dental prostheses

A method for coating teeth or dental prostheses, which comprises:

• forming a composition which contains
• (a) at least on compound having Formula (I)
• MR.sub.x (I)
• wherein M is selected from the group consisting of Ti, Zr, Si, Ge, Sn, and Al;
• R is selected from the group consisting of halogen, hydroxy, alkoxy, acyloxy and a chelate ligand;
• and x is a number corresponding to the valency of M;
• and either
• (b) an organic silane having Formula (II) or an oligomer thereof, or both,
• R".sub.n SiX.sub.4-n (II)
• wherein R" is selected from the group consisting of alkyl, alkenyl, aryl, arylalkyl, alkylaryl, arylalkenyl, and alkenylaryl, each of which may be interrupted by oxygen atoms, sulfur atoms, or --NH-- groups;
• X is selected from the group consisting of hydrogen, halogen, hydroxy, alkoxy, acyloxy, and the group --NR'.sub.2, wherein each R' is hydrogen or alkyl, and n is 1, 2, or 3;
• or
• (c) an organofunctional silane having Formula (III) or an oligomer thereof, or both,
• R".sub.m (R"'Y).sub.n SiX.sub.(4-m-n) (III)
• wherein R", X and n have the meanings set forth above, R"' is selected from the group consisting of alkylene, phenylene, alkylenephenylene, and alkenylene, each of which may be interrupted by oxygen atoms, sulfur atoms, or --NH-- groups;
• Y is selected from the group consisting of halogen, hydroxy, merapto, polyoxyalkylene, optionally substituted amino, quaternary ammonium, amido, polyamido, an aldehyde group, a keto group, a carboxy group, an alkoxycarbonyl group, a sulfonic acid group, a phosphoric acid group, an epoxy group, an acryloxy group, and a methacryloxy group, and m is 0, 1, or 2;
• or a mixture of (b) and (c);
• precondensing said composition to form a liquid precondensate;
• adding a solvent and optionally at least one adjuvant to said precondensate to from a coating preparation;
• applying said preparation to a tooth or dental prosthesis;
• and curing said preparation.