US No. 57 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 010 – FG | Pack of 6

Busch No. 21 010 – FG (US No. 57) is the smallest-diameter friction-grip bur in the 21 straight fissure (cylinder) line: a 1.0 mm (ISO 010) flat-end carbide cylinder on an FG shank for high-speed turbine handpieces. Pack of 6, made in Germany by Busch & Co. GmbH; the same head is offered as 21 010 RA for latch contra-angles.

Why choose the FG version

A 1.0 mm cylinder in a high-speed turbine is typically used for conservative access — opening small occlusal lesions, refining narrow fissure preparations and creating fine, parallel walls with minimal removal of sound tissue. Its FG shank suits the air-turbine or electric high-speed handpieces used chairside; if you prefer to run the No. 57 at low speed in a latch contra-angle, choose the RA version.

Also available: No. 21 012 – RA, No. 21 010 – RA, No. 21 012 – FG, No. 21 016 – FG, No. 21 016 – HP, No. 21R 014 – HP, No. 21R 014 – FG.

Product Specifications

• Type: Carbide, Cylinder Flat, Excavating and Fissure Bur
• US No.: 57
• ISO Classification: 500 314 107 006 010
• Shank: FG (Friction Grip)
• Pack Quantity: 6 burs per pack

Key Features

As a high-quality carbide cylinder fissure dental bur, this instrument features a flat-end cylinder geometry that provides controlled, predictable cutting. The carbide construction ensures superior hardness and edge retention compared to standard steel alternatives, making it a reliable choice for demanding clinical environments. Busch burs are proudly made in Germany, reflecting a long-standing tradition of precision manufacturing in dental instrumentation.

Instrument Dimensions

Per ISO 6360, the size number is the maximum head diameter in tenths of a millimeter. See our Busch Bur Size Chart for the full size conversion table, shank codes, and color ring guide.

Applications

The carbide cylinder fissure dental bur is well-suited for the following clinical procedures:

Cavity/Fissure Preparation — Opening, extending and shaping cavities and fissures with controlled removal of enamel and dentin.

FAQ

What shank type does this bur use? This bur uses an FG (Friction Grip) shank, compatible with standard high-speed handpieces.

How many burs are included in each pack? Each pack contains 6 carbide cylinder fissure dental bur units, providing excellent value for busy dental practices.

What is the ISO classification for this bur? The ISO classification is 500 314 107 006 010, corresponding to US No. 57.

Compare With

Manufacturer literature: Busch catalogs and product brochures for this line are available in our Busch Burs Catalog Library.