Straight Fissure Burs | Cylinder Shape
Straight fissure burs — Busch figure 21 (plain cut), 31 (crosscut) and 36 (steel crosscut) — are parallel-sided cylinders with a flat end for cavity walls, crown sectioning, and amalgam preparation. The collection covers plain-cut US numbers 55–63 and the crosscut 555–564 family, including the 557 and 558, in FG, RA, and HP shanks.
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Crosscut toothing breaks chips for aggressive, cool cutting through enamel, dentine, and metal; plain cuts leave smoother walls. Busch grinds both with the flute precision that made German fissure burs the standard.
Busch & Co. GmbH
Regular price $36.99Unit price-
Busch & Co. GmbH
US No. 59 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 014 – RA | Pack of 6
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $19.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
Regular price $36.99Unit price -
Busch & Co. GmbH
US No. 60 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 016 – FG | Pack of 6
Regular price $36.99Unit price -
Busch & Co. GmbH
US No. 59 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 014 – FG | Pack of 6
Regular price $36.99Unit price -
Busch & Co. GmbH
US No. 58 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 012 – FG | Pack of 6
Regular price $36.99Unit price -
Busch & Co. GmbH
US No. 57 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 010 – FG | Pack of 6
Regular price $36.99Unit price -
Busch & Co. GmbH
US No. 56 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 009 – FG | Pack of 6
Regular price $36.99Unit price -
Busch & Co. GmbH
US No. 55 Busch Carbide Straight Fissure (Cylinder) Bur | Busch No. 21 008 – FG | Pack of 6
Regular price $36.99Unit price
Reference pages already linked from this collection, in one place.
Which Straight Fissure Bur Do You Need?
Choose plain cut or crosscut, then carbide or steel, then the US number (the Busch size code is the head diameter in tenths of a millimeter). Every active product in the collection is linked once below.
Carbide plain cut — figure 21 (US 55–63)1 items
Carbide crosscut — figure 31 (US 555–563)1 items
Steel crosscut — figure 36 (US 555–564 and unnumbered sizes), HP1 items
Clinical Use
Plain-cut figure 21 cylinders leave smoother cavity walls and are used for finishing the preparation; crosscut figure 31 carbides cut faster and cooler through enamel, dentine, and metal, so they are the choice for bulk cavity preparation, crown and amalgam sectioning, and the US 557/558 workhorse sizes; and the figure 36 steel crosscuts, offered only on the HP shank, are the low-speed straight-handpiece option in the same US sizes plus the unnumbered 0.7–3.1 mm heads.
Care and Reconditioning
Carbide and steel fissure burs are cleaned, disinfected, and sterilized between patients in a bur block; steel burs must be dried promptly to prevent corrosion, and any bur with a chipped blade or a bent shank is discarded. Our Dental Bur Reprocessing & Sterilization Guide covers the full workflow for Busch rotary instruments.
Compare With
Related Busch collections: Tapered Fissure Burs, Cylinder Round-End Burs, Cavity Preparation Burs, and FG Burs. For US-to-Busch figure numbers and terminology, see the Bur Comparison Chart, the US Bur Number Finder, and the Dental Bur Glossary.
Reference resources: Bur Comparison Chart · Speed Chart · Color Coding & ISO Guide · Glossary
FAQ
What is a 557 bur?
The US No. 557 is the crosscut straight fissure bur — Busch figure 31, size 010 — arguably the most-used carbide in operative dentistry for cavity preparation and crown removal.
Plain cut or crosscut?
Crosscut (555–563) cuts faster and cooler and is preferred for bulk work and sectioning; plain cut (55–63) leaves smoother cavity walls for finishing.
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.
Further reading: The Ultimate Guide to the 1557 Dental Bur: Precision, Performance, and Why Busch
