US No. 558 Bur – Busch Straight Fissure Carbide & Steel, Made in Germany

Which US No. 558 Do You Need?

Choose by shank first, then by head length; every active product in the collection is linked once below by its Busch number.

FG (friction grip, 1.6 mm shank, high-speed handpiece). HP (2.35 mm shank, straight handpiece). FG-XL (friction grip, 25 mm surgical length). See the Busch Bur Size Chart for head and shank dimensions.

Speed and Technique

Run the FG versions in the high-speed handpiece with continuous water spray and light, intermittent pressure; let the blades do the work. HP versions run at laboratory speed in the straight handpiece. Maximum recommended speeds for every Busch shape are in our Dental Bur Speed Chart, and reprocessing steps in the Bur Sterilization Guide.

Made in Germany by Busch & Co.

Busch & Co. has manufactured rotary instruments in Engelskirchen, Germany since 1905. Every instrument on this page is a genuine Busch product, precision-ground on a concentric shank under ISO 13485-certified quality management and covered by our Busch warranty.

Clinical Use

• Cavity preparation: opening through enamel and establishing the straight walls and flat floor of Class I and Class II preparations, including proximal boxes.
• Restoration removal: cutting out old amalgam and composite; crosscut versions clear the debris instead of packing with it.
• Sectioning: dividing crowns and multi-rooted teeth, where the surgical-length versions add reach and visibility.
• Laboratory and denture work: the HP carbide and steel versions trim acrylic, adjust denture bases and reduce plaster models in the straight handpiece.

At 1.2 mm the No. 558 is the standard operative size.

The 558L (Busch 31L 012) carries a longer cutting head for deeper boxes and taller walls. The 558X is the surgical version: the same cutting head on a 25 mm FG-XL shank for reach when sectioning teeth and roots, with a rounded end.

The No. 558 is crosscut; its plain-cut twin in the same shape and size is the US No. 58 (Busch 21 012). Crosscut blades cut faster and clear debris; when you need a smooth wall or a finish line, follow with the plain-cut twin or a finishing bur.

Care and Reconditioning

Busch carbide and steel burs are reusable: clean, disinfect and sterilize them between patients following the manufacturer instructions and replace them once they dull. Our Dental Bur Reprocessing & Sterilization Guide gives the steps for Busch rotary instruments.

Compare With

Related Busch collections: US No. 58 Bur, US No. 557 Bur, Straight Fissure (Cylinder) Burs, Double Cut Burs: Busch Crosscut Carbide Cutters, Crown Cutting Burs, and Oral Surgery Burs. For bur numbering and dimensions, see the Busch Bur Size Chart and the Surgical Bur Guide.

Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary · Nearby sizes: US No. 556, US No. 557, US No. 559, US No. 560

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