A device (10) for installing in the oral cavity dental prostheses with implant support, which comprises: – an abutment (11), constituted by a base portion (12) from which a frustum-shaped portion protrudes which is either coaxial (13) to the base portion (12), or is inclined (113) with respect to it, the abutment (11) having a through hole (14) on the axis (15) of the base portion (12) for a primary screw (16) for fixing to an implant body (17) and an optional second hole (118), on the axis (119) of the optional inclined frustum-shaped portion (113), for a secondary screw (20), – a sealing and grip cap (21), which is shaped complementarily in order to be fitted onto the frustum-shaped portion (13, 113) and be retained thereon with snap-acting fixing means, – a coupling side wall (22) designed to be incorporated in a dental prosthesis (23) and complementarily shaped in order to receive the cap (21) and the underlying frustum-shaped portion (13, 113) of the abutment (11) the coupling side wall (22) is designed to be fixed to the cap (21) and to the frustum-shaped portion (13, 113) by way of at least one selected from among the following means: – snap-acting engagement means, – means for fixing by way of a secondary screw (20), – means for fixing by way of a lateral threaded element (24) and a threaded bushing (25) that is incorporated in the dental prosthesis (23).Linvention concerne un dispositif (10) à installer dans les prothèses dentaires de cavité buccale comprenant un support dimplant, qui comprend : - une butée (11), comprenant une partie base (12) à partir de laquelle fait saillie une partie en forme de tronc qui est soit coaxiale (13) à la partie base (12), soit inclinée (113) par rapport à celle-ci, la butée (11) ayant un trou traversant (14) sur laxe (15) de la partie base (12) pour une vis primaire (16) à fixer sur un corps dimplant (17) et un second trou facultatif (118) sur laxe (119) de la partie en forme de tronc inclinée facultative (113) pour une vis
