This invention relates to a composition resulting from the mixture of a solid phase, comprising at least one calcium derivative powder in association with at least one radioopacifier and at least one polymer and optionally at least one non-radioopaque filler, all in powder form； and aqueous phase comprising water, at least one water-reducing agent, and at least one set accelerator； the ratio of solid phase to liquid phase ranging from 1.0 to 2.5, preferably from 1.5 to 2.2, more preferably from 2 to 2.15； said composition having a compressive strength of less than 40 MPa, preferably ranging from 1 to 15 MPa, preferably ranging from about 3 to about 12 MPa； this invention also relates to a kit and a method for the manufacture of the composition, and to a method for treating or retreating a canal root.
