Dental cement composition comprising (a) a polymerizable polyacidic polymer having repeating units in the polymer backbone, which are represented by the following formula (I): wherein X represents O, S, or NR', whereby R' represents a hydrogen atom or a straight or branched C 1 -C 6 alkyl group, C 3 -C 6 cycloalkyl group, or C 4 -C 8 cycloalkylalkyl group, Y is a moiety of the following formula (II): wherein L 2 represents a single bond, a straight or branched C 1 -C 6 alkylene group, or a straight or branched C 1 -C 20 alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms； L 3 represents a straight or branched C 1 -C 3 alkylene group, which may optionally include 1 to 4 atoms selected from oxygen and sulfur atoms； m represents an integer of from 0 to 6； Z represents H or -COOH； Z' represents H or (CH 2 ) x COOH, wherein x is 0, 1, or 2, L 1 represents a single bond, a straight or branched C 1 -C 6 alkylene group, a straight or branched C 1 -C 6 alkylenylene group, or a straight or branched C 1 -C 20 alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms； and having repeating units in the polymer backbone, which are represented by the following formula (III): wherein L 4 represents a single bond, a straight or branched C 1 -C 6 alkylene group, a straight or branched C 1 -C 6 alkylenylene group, or a straight or branched C 1 -C 20 alkylene group which includes 1 to 8 atoms selected from oxygen and sulfur atoms； and Z" represents H or -COOH； (b) a polymerizable monomer having at least one polymerizable functional group； (c) a radical polymerization initiator.La présente invention concerne une composition de ciment dentaire comprenant (a) un polymère polyacide polymérisable qui présente des unités récurrentes dans le squelette du polymère, représentées par la formule (I). Dans ladite formule, X représente O, S, ou NR', R' représentant un atom
