US No. 1/4 Bur – Busch Round Carbide & Steel, Made in Germany
The US No. 1/4 is the American number for a round bur with a 0.5 mm head (ISO size 005): a spherical head that cuts on every surface, so it excavates, opens and shapes in any direction. Busch & Co. manufactures it in Germany as Busch No. 1 005. Every US No. 1/4 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 1/4 Busch Carbide Round Bur | Busch No. 1 005 – FG | Pack of 6
Regular price $35.99Unit price-
Busch & Co. GmbH
US No. 1/4 Busch Carbide Round Bur | Busch No. 1 005 – HP | Pack of 6
Regular price $35.99Unit price -
Busch & Co. GmbH
US No. 1/4 Busch Steel Round Bur | Busch No. 1 005 – HP | Pack of 6
Regular price $17.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 1/4 Do You Need?
Choose by shank first, then by material; every active product in the collection is linked once below by its Busch number.
FG (high-speed handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 1 005 | 1/4 | Carbide | Plain-cut | FG | High-speed handpiece | 6 |
HP (straight handpiece)2 items
FG (friction grip, 1.6 mm shank, high-speed handpiece). HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.
Speed and Technique
In the high-speed handpiece use the FG versions with water spray and a light touch; HP versions run in the straight handpiece for laboratory work. 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
- Caries excavation: removing softened dentin from the cavity floor and walls with light, sweeping strokes.
- Access: initial penetration of enamel and the first opening of a cavity or endodontic access.
- Retention and shaping: undercuts and retention grooves where a rounded form is wanted, and smoothing rounded internal line angles.
- Laboratory work: the HP and steel versions hollow out, relieve and adjust acrylic, plaster and wax in the straight handpiece.
At 0.5 mm the No. 1/4 is a fine head for pinpoint caries, pit-and-fissure work and pediatric preparations.
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: Round (Rosehead) Burs, Inverted Cone Burs, Straight Fissure (Cylinder) Burs, and HP Burs for the Straight Handpiece. For bur numbering and dimensions, see the Busch Bur Size Chart and the Dental Bur Color Coding & ISO Guide.
Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary · Nearby sizes: US No. 1/2, US No. 3/4
FAQ
What is the Busch number for a US 1/4 bur?
Busch No. 1 005 in carbide (FG/HP); Busch No. 1 005 in steel (HP).
What size is a No. 1/4 bur?
The No. 1/4 has a 0.5 mm head diameter (ISO size 005) on a round bur head, ISO shape 001 (ball).
Carbide or steel?
Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 1/4 is the economical choice for acrylics, plaster and other soft materials in the laboratory.
Are Busch No. 1/4 burs reusable?
Yes. Carbide and steel burs are cleaned, disinfected and sterilized between patients and replaced when they dull; the Bur Sterilization Guide gives the validated steps.
