One aspect relates to a bone cement applicator for mixing and applying a bone cement, with which the starting components of the bone cement is mixable in a closed cartridge to form a bone cement dough. The cartridge has a multi-part closure system including a discharge opening. At least two parts of the closure system are movable relative to one another, driven by a movement of the mixed bone cement dough, and the discharge opening is opened the movement of the at least two parts of the closure system relative to one another. The movement of the mixed bone cement dough is drivable by a pressure on the bone cement dough.
