Inverted Cone Burs

Inverted cone burs — heads that widen away from the shank — create mechanical undercuts and flat cavity floors that no other shape produces as directly. The collection spans US numbers 33½ through 41 in carbide, diamond, and steel, plus abrasive and polisher forms of the geometry.

From amalgam retention features to flattening a pulpal floor, the inverted cone remains a daily instrument, and Busch manufactures it across every material class with identical German tolerances.

FAQ

What is an inverted cone bur used for? Creating undercuts for mechanical retention, flattening cavity floors, and removing thin defective enamel at the cavosurface.

Which sizes are available? US numbers 33½ through 41 (ISO 006–023), in FG, RA, and HP shanks depending on figure.

Where are these burs made? Every instrument in this collection is manufactured by Busch & Co. in Engelskirchen, Germany — an ISO 13485-certified specialist in rotary precision instruments since 1905 — and ships fast from our US warehouse.

Reference resources: Bur Comparison Chart · Speed Chart · Color Coding & ISO Guide · Glossary