Curable, one- or multicomponent composition for dental casting, comprising - a curable base composition and - a surfactant system comprising or consisting of - 0.75 to 3 wt.% of a first surfactant of the formula wherein o is an integer from 5 to 22, p is an integer from 2 to 20, and q is an integer from 0 to 5 R2 is hydrogen or a methyl group, wherein within a molecule R2 can have different meanings in the context of the definition given, - 0.75 to 3 wt.% of a second surfactant which is selected from the group of nonionic fluorosurfactants, - 0 to less than 0.5 wt.% of a third surfactant which is selected from the group of silicone surfactants, - wherein the total amount of first, second and third surfactant is in the range of from 2 to 6 wt.%, with the proviso that - the weight ratio of the first surfactant to the second surfactant is 1.4 or less when the content of the third surfactant is in the range of from 0 to less than 0.5 wt.% and the total amount of first and second surfactant is 2 wt.% or less, wherein all the per cent by weight data are based on the total weight of the composition. - a curable base composition - a surfactant system comprising or consisting of - 0.75 to 3 wt.% of a first surfactant of the formula wherein o is an integer from 5 to 22, p is an integer from 2 to 20, and q is an integer from 0 to 5 R2 is hydrogen or a methyl group, wherein within a molecule R2 can have different meanings in the context of the definition given, - 0.75 to 3 wt.% of a second surfactant which is selected from the group of nonionic fluorosurfactants, - 0 to less than 0.5 wt.% of a third surfactant which is selected from the group of silicone surfactants, - wherein the total amount of first, second and third surfactant is in the range of from 2 to 6 wt.%, with the proviso that - the weight ratio of the first surfactant to the second surfactant is 1.4 or less when the content of the third surfactant is in the range of from 0 to less than 0.5 wt.% and the total amount of first and second surfactant is 2 wt.% or less, wherein all the per cent by weight data are based on the total weight of the composition. - 0.75 to 3 wt.% of a first surfactant of the formula wherein o is an integer from 5 to 22, p is an integer from 2 to 20, and q is an integer from 0 to 5 R2 is hydrogen or a methyl group, wherein within a molecule R2 can have different meanings in the context of the definition given, o is an integer from 5 to 22, p is an integer from 2 to 20, and q is an integer from 0 to 5 R2 is hydrogen or a methyl group, wherein within a molecule R2 can have different meanings in the context of the definition given, - 0.75 to 3 wt.% of a second surfactant which is selected from the group of nonionic fluorosurfactants, - 0 to less than 0.5 wt.% of a third surfactant which is selected from the group of silicone surfactants, - wherein the total amount of first, second and third surfactant is in the range of from 2 to 6 wt.%, - the weight ratio of the first surfactant to the second surfactant is 1.4 or less when the content of the third surfactant is in the range of from 0 to less than 0.5 wt.% and the total amount of first and second surfactant is 2 wt.% or less, wherein all the per cent by weight data are based on the total weight of the composition.