The invention provides a dental sealing composition curable in the absence ofapolymerisation initiator which comprises (i) an amino terminated prepolymerhaving aviscosity at 23°C of less than 100 Pa.cndot.s, which is obtained byreacting (a) one mole ofa compound of formula (I)(see formula I)and (b) at least n moles of one or more compounds of either formula (II)(see formula II)or of formula (II) in combination with one or more compounds of formula RNH2and/orin combination with a further di- or polyamine compound； (ii) a di- orpolyfunctionalacrylate compound or a di- or polyfunctional maleimide compound which iscapableof undergoing polyaddition with the aminoterminated prepolymer (i)；(iii) 40 to 85 wt.-% of a filler for providing a minimum radioopacity of atleast3mm/mm AI； said composition being in the form of a two-component compositionwherein a first component contains the amino terminated prepolymer (i) andoptionally filler (iii) and a second component contains the compound (ii)capable ofundergoing polyaddition with the aminoterminated prepolymer (i) and optionallyfiller (iii).
