An interface element for dental prostheses, consisting of a hollow cylindrical body with two different sections, one lower (a) of greater outer diameter and another upper (b) of smaller outer diameter, provided externally with retention circular grooves (2), internally a seat (4) for the screw head (5) which fixes the implant, and a lower base (6), wherein it has a side mortise (7) which covers the upper section (b) determining a side opening for the inclined entrance of the screw (5) and screwdriver (8), whose height and width allow an inclination of up to an angle of 30°, with respect to the axial shaft of the cylindrical body and freedom of lateral movement of the screwdriver (8) of up to 90°. Furthermore, it has two flat areas (9) at diametrically opposite points of the outer surface of the lower section (a) of greater diameter of the circular body.