Resinous dental composition based on polymerisable polysiloxanes

A resinous dental composition, which is photochemically or thermally curable in the presence of initiators, or self curable in the presence of a redox catalyst, comprising/polymerisable polysiloxanes which are obtained by hydrolytic condensation of

• a) one or more hydrolytically condensable compounds of silicon;
• and
• b) if desired, elements selected from the group consisting of B, Ba, Ti, Zr, Al, Sn, and/or transition metals;
• and
• c) if desired, precondensates of the hydrolytically condensable compounds in (a) and/or the elements in (b);
• if appropriate in the presence of a catalyst and/or of a solvent, by the action of water or moisture;
• wherein 1 to 100 mol % of the polymerisable polysiloxanes are based on monomeric compounds of silanes of the general formula (I)
• Y.sub.n SiX.sub.m R.sub.4-(n+m) (I)
• in which the radicals X, Y and R are identical or different and have the following meaning:
• R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl,
• X=hydrogen, halogen, hydroxyl, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR'.sub.2, where R'=hydrogen, alkyl or aryl,
• Y=a substituent which contains a substituted or unsubstituted 1,4,6-trioxaspiro (4.4) nonane radical
• n=1,2 or 3,
• m=1, 2 or 3, where n+m.ltoreq.4;
• and of silanes of the general formula (II)
• {X.sub.n R.sub.k Si(R.sup.2 (A).sub.l).sub.4-(n+k) }.sub.t D(II)
• in which the radicals A, R, R.sup.2 and X are identical or different and have the following meaning:
• A=O, S, PR', POR', NHC(O)O or NHC(O)ONR',
• where R'=hydrogen, alkyl, or aryl,
• D=a straight-chain or branched organic radical which is derived from a compound D' having at least one (for l=1 and A=NHC(O)O or NHC(O)NR') or at least two C.dbd.C double bonds and 5 to 50 carbon atoms, where R'=hydrogen, alkyl or aryl,
• R=alkyl, alkenyl, aryl, alkylaryl or arylalkyl,
• R.sup.2 =alkylene, arylene or alkylenearylene,
• X=hydrogen, halogen, hydroxyl, alkoxy, acyloxy, alkylcarbonyl, alkoxycarbonyl or NR'.sub.2, where R'=hydrogen, alkyl or aryl,
• n=1, 2 or 3,
• k=0, 1 or 2
• l=0 or 1,
• t=an integer whose maximum value corresponds to the number of double bonds in the compound D' minus 1, or is equal to the number of double bonds in the compound D' when l=1 and A represents NHC(O)O or NHC(O)NR'.