Patent ID: 8044113

Claim:
A dental root canal sealing composition, which comprises (i) an amino terminated prepolymer having a viscosity at 23° C. of less than 100 Pas, which is obtained by reacting (a) one mole of a compound of the following formula (I) wherein Z represents an n-valent C 2-42 hydrocarbon group, which groups may contain 1 to 6 oxygen atoms, and which may be substituted by 1 to 6 C 1-4 alkyl groups; X represents a single bond or an oxygen atom or a nitrogen atom substituted by a C 1-4 alkyl group; L represents a single bond or an optionally substituted C 1-6 alkylene group, an optionally substituted C 6-14 arylene group, an optionally substituted C 7-16 alkylenearylene group, an optionally substituted C 7-16 arylenealkylene group, which groups may be substituted by 1 to 6 C 1-4 alkyl groups; and n represents an integer of from 2 to 6; and (b) at least n moles of one or more compounds (b1) of the following formula (II) wherein A represents a divalent saturated aliphatic C 2-16 hydrocarbon group or a divalent saturated cycloaliphatic C 3-6 hydrocarbon group, which groups may contain 1 to 6 oxygen atoms, and which may be substituted by 1 to 6 C 1-4 alkyl groups; R a and R b are the same or different and represent a hydrogen atom, a C 1-6 alkyl or a C 3-14 cycloalkyl group, which may be substituted by one or more members of the group selected from a C 1-4 alkyl group, C 1-4 alkoxy group, a phenyl group, and a hydroxy group; or (b2) of formula (III) R′NH 2 (III) wherein R′ represents a substituted or unsubstituted C 1 to C 18 alkyl group, a substituted or unsubstituted C 3 to C 18 cycloalkyl group, a substituted or unsubstituted C 7 to C 30 aralkyl group, which groups may be substituted by one or more members of the group selected from a C 1-4 alkyl group, C 1-4 alkoxy group, a phenyl group, and a hydroxy group, optionally in combination with a further di- or polyamine compound; (ii) a compound capable of undergoing polyaddition with the aminoterminated prepolymer (i); (iii) 40 to 85 wt.-% of a filler for providing a minimum radioopacity of at least 3 mm/mm Al.