FIELD: medicine, stomatology. SUBSTANCE: invention relates to filling materials. Composition for filling root channels is prepared on the basis of resorcinol-formaldehyde resin containing powdery zinc oxide, barium sulfate and paraform, curative liquid consisting of formalin and catalytic liquid that has resorcinol and acid or alkaline catalysts. Curative and catalytic liquids have additionally polyhydric alcohols, or polyethylene glycols, or Twins, or polyvinylpyrrolidone, or polyvinyl alcohol, or their mixtures as plasticizer. Components are taken at the definite quantitative ratio. Composition shows high plasticity, penetrability, good solubility, long hardening time. EFFECT: improved quality and properties of composition. 1 tbl
