Cutting burr

The cutting burr is designed to remove large amounts of bone rapidly. It has flutes orientated like the lines of longitude on the globe. This means that the maximum speed or excursion of those cutting edges will be at the equator of the drill.

Always use the equator, or as close to the equator as possible. To drill end on with the burr will be a very counter productive exercise.

Cutting burrs with very few flutes (6 or so) are too aggressive for use in the mastoid region.