Root fractures in the posterior jaw, deep apical
Deep-lying root fragments threaten to be pushed into the sinus during removal.
They are usually well loosed. Non-loosened root fragments must be loosened before using the stickremover. You can osteotomize circulatory around the fragment and then release the fragment with the lever.
The Benex hole is made without pressure (the drill diamond grinds). The Benex screw can be introduced without pressure, which ensures a safe extraction of the root fragment.