The invention relates to a curable composition for dental retraction comprising a resin matrix comprising at least one polyorganosiloxane with at least two olefinically unsaturated groups as component A1, at least one organohydrogenpolysiloxane as component A2, optionally at least one vinyl functional QM silicone component as component A3, at least one alkylsiloxane having at least one carbinol, silanol, or alkoxy moiety as component B, optionally surfactant(s) as component E, optionally additive(s) as component F, a filler system comprising filler(s) as component D, a catalyst system comprising addition cure catalyst component C-A suitable to cure components A1 and A2, condensation cure catalyst component C-B suitable to cure component B, the curable composition being provided as a kit of part comprising a Catalyst Part I and a Base Part II the Catalyst Part I comprising components C-A, C-B, A1, the Base Part II comprising components A2, A1, B, wherein each of components D, E and F and A3, if present, can be present either in the Catalyst Part I or the Base Part II or the Catalyst Part I and the Base Part II, and wherein component B is present in an amount of 6 wt. % or more with respect to the whole composition.L'invention concerne une composition durcissable pour rétraction dentaire comprenant une matrice de résine comprenant au moins un polyorganosiloxane ayant au moins deux groupes à insaturation oléfinique en tant que composant A1, au moins un organohydrogénopolysiloxane en tant que composant A2, éventuellement au moins un composant silicone QM à fonction vinyle en tant que composant A3, au moins un alkylsiloxane ayant au moins une fraction carbinol, silanol ou alcoxy en tant que composant B, éventuellement tensioactif(s) en tant que composant E, éventuellement additif(s) en tant que composant F, un système charge comprenant charge(s) en tant que composant D, un système catalyseur comprenant un composant catalyseur de durcissement par addition C-A approprié po
