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

The Busch No. 21 010 – RA (US No. 57) delivers a 1.0 mm (ISO 010) flat-end carbide cylinder fissure head on a latch-type right-angle (RA) shank for slow-speed contra-angle handpieces. It is the low-speed counterpart to the 21 010 FG and is supplied as a pack of 6, manufactured in Germany by Busch & Co. GmbH.

Why choose the RA version

Running a 1.0 mm cylinder at low speed in a latch contra-angle is typically favoured for controlled dentine work — finishing cavity floors and walls, removing residual caries near the pulp with more tactile feedback than a turbine allows, and small-scale preparation adjustments. The RA shank locks securely into standard slow-speed handpieces; for high-speed enamel cutting the No. 57 is also available as an FG bur.

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

Product Overview

This carbide cylinder fissure dental bur features a flat-ended cylinder geometry, making it ideal for controlled excavation and fissure preparation procedures. The carbide construction ensures long-lasting sharpness and consistent cutting efficiency across multiple uses. Each pack contains 6 burs, offering excellent value for busy dental practices.

Standard Classification: ISO: 500 204 107 006 010

US No.: 57 | Item No.: 21 010

Key Features

• Carbide construction for superior hardness and cutting performance
• Cylinder flat head geometry for precise preparation
• Engineered for excavating and fissure procedures
• ISO-classified for standardized clinical use
• Made in Germany to stringent quality standards
• Sold in a convenient pack of 6

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.

The carbide cylinder fissure dental bur is particularly well-suited for cavity and fissure preparation, where a flat-ended profile provides clean, accurate cuts with minimal tissue damage. Its design supports efficient removal of decay while maintaining cavity wall integrity.

FAQ

What is the ISO classification for this bur? The ISO classification is 500 204 107 006 010, ensuring compatibility and standardization across dental settings.

How many burs are included per pack? Each pack contains 6 individual carbide cylinder fissure dental burs.

What procedures is this bur designed for? It is designed for cavity preparation and fissure excavation in restorative dentistry.

Compare With

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