Stainless steel bur with a special diamond coating to reduce gouging (grit size 130?m). Tip matches round bur sizes for initial penetration, while its diamond shaft flares the pulp chamber and the canal walls. Cavity access performed within one operation using a single bur on monoradicular teeth and shaping, on pluriradicular teeth, of a conical access adapted to the insertion of the Endo-Z and Diamendo burs.