A device (10, 110) for installing dental prostheses with implant support in the mouth, comprising- an abutment (11, 111), constituted by a base portion (12, 112), from which a frustum-shaped portion extends which is, as an alternative, coaxial (13) with respect to the base portion (12) or inclined (113) with respect to it,- a sealing and gripping retention element (14, 214), which is shaped so as to be mounted on the frustum-shaped portion (13, 113),on the retention element (14, 214) there being at least one first part (15) for snap fixing on the abutment (11) and at least one second part (16) for snap fixing, as an alternative, either to a skirt (17), which is designed to be incorporated in a dental prosthesis (18), or directly to a dental prosthesis (18).
