A dental scan abutment adapted for the assembly and fixing thereof to a dental implant provided with anti-rotation means and an internally threaded hole or to a replica of the implant, the dental scan abutment comprising a main body, which is provided with an indicator of the radial angular position of the anti-rotation means of the implant or of the replica thereof when the dental scan abutment is in an operative fixing position, with connection means for connection to the implant or to the replica thereof arranged in a lower section of the main body, and with an axial hole passing through the lower section of the main body to the upper section thereof, the dental scan abutment further comprising fixing means for fixing the dental scan abutment to the implant, formed by a fixing shaft with a threaded lower end with a thread cutting complementary to the internal cutting of the threaded hole of the implant or of the replica thereof to which the dental scan abutment is adapted in order to be fixed, in which the thread cutting forms a widening section, in the radial direction of the diameter of the fixing shaft, and by an end head arranged at the upper end of the fixing shaft, characterized in that - the head of the fixing means has a diameter or width greater than the diameter of the fixing shaft and equal to or greater than the diameter or width of the upper section of the main body, is configured to be capable of being manually rotated around the axial axis of the fixing shaft and of transmitting said rotation to the fixing shaft with respect to the main body and has an external surface, orientated in opposition to the fixing shaft, smooth and without holes, notches or hollows for the fitting of external tools; and in that - the axial hole of the main body comprises a retention housing for the threaded lower end of the fixing shaft, formed by a widening with a diameter equal to or greater than the external diameter of the threaded lower end, the retention housing being limited at the top by a narrower section of axial hole with an essentially equal diameter to the diameter of the fixing shaft or the narrower section being a section of a thread cutting complementary to the thread cutting of the threaded lower end of the fixing shaft adapted so that the threaded lower end is capable of occupying and passing through said narrower section in the longitudinal direction upon rotating the head in one direction or another, by which the main body is configured for housing and longitudinally displacing the fixing shaft therethrough, the threaded lower end of the fixing shaft being capable of being immersed in the interior of the main body or of projecting from the lower section thereof, the complete removal of the fixing shaft by simply longitudinally displacing the fixing shaft with respect to the main body being prevented by a mechanical stop. - the head of the fixing means has a diameter or width greater than the diameter of the fixing shaft and equal to or greater than the diameter or width of the upper section of the main body, is configured to be capable of being manually rotated around the axial axis of the fixing shaft and of transmitting said rotation to the fixing shaft with respect to the main body and has an external surface, orientated in opposition to the fixing shaft, smooth and without holes, notches or hollows for the fitting of external tools; and in that - the axial hole of the main body comprises a retention housing for the threaded lower end of the fixing shaft, formed by a widening with a diameter equal to or greater than the external diameter of the threaded lower end, the retention housing being limited at the top by a narrower section of axial hole with an essentially equal diameter to the diameter of the fixing shaft or the narrower section being a section of a thread cutting complementary to the thread cutting of the threaded lower end of the fixing shaft adapted so that the threaded lower end is capable of occupying and passing through said narrower section in the longitudinal direction upon rotating the head in one direction or another, by which the main body is configured for housing and longitudinally displacing the fixing shaft therethrough, the threaded lower end of the fixing shaft being capable of being immersed in the interior of the main body or of projecting from the lower section thereof, the complete removal of the fixing shaft by simply longitudinally displacing the fixing shaft with respect to the main body being prevented by a mechanical stop.