Endo Safe End endodontic access burs feature a safe end, non-cutting tip, Prohibits depth cutting to prevent penetration of the pulp chamber floor and to prevent ledging, Endo Safe End instruments are available in 2 sizes (1.4mm and 1.8mm). Initial Endodontic Access, Use appropriate sized round carbide operative burs (FG #4, FG #6 etc.) or appropriate sized Great White round burs (both standard and surgical length shanks available) to access the metal coping material. If endo access is through a PFM crown, penetrate the porcelain with a round diamond and then switch to a Great White round bur to access the metal coping material. Enlargement of Endo Access to Gain Straight Line Access to All Canals, This must be accomplished without penetrating the floor of the pulp chamber. The Endo Safe End instrument will cut only laterally and not apically to prevent perforation of the furcation area. The ideal bur for this procedure would be side-cutting only with a safe end (non-cutting) tip designed to prevent ledging the SS White Endo Safe End burs.