Assembly (1) of angular attachment (2) and connection screw (3) attachment-implant for its attachment to a dental implant (5), wherein the angular attachment (2) comprises a base part (21) for fixing to the dental implant (5) through the connecting screw (3), implant-abutment, an upper part (22) with an essentially conical boundary surface for the coupling of a dental prosthesis (4) through a second screw ( 6) of prosthesis-abutment fixation, a first through hole (7) for the passage of the attachment screw (3) implant-implant, and a second threaded hole (8), disposed through the upper part (22) of the angular attachment (2), in communication with the first through-hole (7) and whose respective axial axes (71, 81) form an angle between them, characterized in that the connecting screw (3) has a head (30) at its end upper comprising at least a first flat side wall (32) parallel to a plane containing the axial axis (31) of the connecting screw (3), the perpendicular distance between the center of the head (30) and the first flat side wall (32) being smaller than the radius of the head (30) of the screw connection (3), measured according to a radial direction parallel to the first flat side wall (32), and in that the first through hole (7) of the angular attachment (2) has an upper end section (70) suitable for the introduction and step of the connection screw (3) attachment-implant, whose internal wall comprises at least a first flat surface (72) extending parallel to a plane containing the axial axis (71) of the first through-hole (7), being arranged the first flat surface (72) facing the second hole (8) of the upper part (22) of the angular attachment (2) and the perpendicular distance between the first flat surface (72) and the axial axis (71) of the first hole through (7) smaller than the radius of the upper end section (70) ) of the first through hole (7), measured in a radial direction parallel to the first flat surface (72), but equal to or greater than the perpe
