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.本發明有關由固相和液相的混合物產生的組合物，上述固相包含全部為粉末形式的至少一種鈣衍生物粉末以及至少一種不透射線劑和至少一種聚合物並且任選包含至少一種非不透射線填充劑，上述液相包含水、至少一種減水劑和至少一種促凝劑；固相與液相的比例為1.0至2.5，優選為1.5至2.2，更優選為2至2.15；上述組合物的抗壓強度小於40 MPa、優選為1 MPa至15 MPa、優選為約3 MPa至約12 MPa；本發明還有關用於製造上述組合物的試劑盒和方法以及用於處理或再處理牙根管的方法。
