The invention relates to a screw, particularly for attaching a superstructure to an intra-osseous implant. The extends along a longitudinal axis and comprises a head and a thread. The head comprises a bearing surface configured to cooperate with a bearing surface of the superstructure to hold the superstructure in position. The thread is configured to engage with a tapping to tighten the bearing surfaces of the superstructure and the screw. Between the bearing surface and the thread, the screw comprises a safety portion. The safety portion comprises a driving shape and a frangible section at the connection between the safety portion and the head of the screw, so that the driving shape remains attached to the thread if the frangible section breaks.
