The present invention relates to dental materials comprising liquid, nanoparticulate functionalized hydrophobic co-condensates of tetraalkyl silicates with functionalized trialkoxysilanes of the formula I P—(CH2)n—Si(OR)3 where P, R and n independently of one another have the following meanings: P=a polymerizable CH2═CH—, CH2═CH—O—, styryl, (meth)acrylic or (meth)acrylamide group or an SH group capable of polyaddition, R=methyl, ethyl or propyl and n=from 3 to 15, which can be prepared by co-condensation of tetraalkyl silicates with alkyltrialkoxysilanes functionalized in the ω position and subsequent end group functionalization with trimethylsilyl groups; The invention further relates to the use of the dental materials for filling composites, fixing cements or materials for coatings.