A bur (30) with features that minimize the application of substantially identical forces to the tissue against which the bur is applied. These features include: flutes (42-56) formed with varying helix angles flutes formed with rake angle that varies along the lengths of the rake surfaces (62) cross cuts (70) formed to provide the bur head with a shape that, in cross section is elliptical asymmetrical located distal end grooves (82) and/or a tip (34) with a profile that, is not constant around the whole of the circumference of the bur head.
