Implant bed was already prepared; in the course of inserting a camlog (progressive line 3.8mm), the automatic torque was activated and the unit stopped without error.The operator used the foot switch to activate counterclockwise rotation (signal sounds before start) and turned the implant back approx.2 revolutions; user wanted to return to clockwise rotation and inadvertently pressed the wrong program button, which changed to the wrong program.The warning tone was not perceived accoustically by the user.The control look at the display was also not carried out.This resulted in a too fast insertion of the implant which led to a subcrestal insertion (4mm too deep).
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