di t butyl aniline and 0 1 parts by weight 2 2 39 hydroxy 5 39 methyl phenyl benzotriazene and kneaded with 400 parts by weight quartz powder which has been pigmented the color of teeth the quartz powder has a grain size less than 60 microns and has been silanized in the usual manner with trimethoxymethacroxyloxypropylsilane paste b 100 parts by weight of the dimethacrylate of example 2 are mixed with 0 1 parts by weight 2 2 39 hydroxy 5 39 methyl phenyl benzotriazine and also kneaded with 400 parts by weight uncolored silanized quartz and which contains 0 65 benzoyl peroxide by mixing equal parts of the two pastes a material is obtained which after being placed in a dental caries gels in about two minutes and in five minutes is essentially hardened the polymerizate obtained is especially color fast both on prolonged preservation under water at 36 u00b0 and on irradiation with long wave ultra violet light ______________________________________solutioncomposition dimethacrylate monomer 100 parts by weight n n bis u03b2 hydroxyethyl 0 5 parts by weight 3 5 di t butyl aniline 2 2 39 hydroxy 5 39 methyl 0 1 parts by weight phenyl benzotriazenepowdercomposition tooth colored quartz 100 parts by weight grain size less than 60 microns silanized in the conventional manner benzoyl peroxide 0 3 parts by weight______________________________________ the solution and powder are mixing in a mixing vessel as described in west german pat no 1 566 294 a 90mg portion of the solution is placed in a foil envelope made from polyethylene backed aluminum and placed in the cover of the mixing vessel the main chamber of the mixing vessel is charged with 320 mg of the above mentioned powder by turning the.