US No. 704 Bur – Busch Tapered Fissure Carbide & Steel, Made in Germany
The US No. 704 is the American number for a tapered fissure bur with a 2.3 mm head (ISO size 023): a cone that narrows toward the tip, so the walls it cuts diverge toward the occlusal: the geometry crown and inlay preparations depend on. Busch & Co. manufactures it in Germany as Busch No. 33 023 and Busch No. 38 023. Every US No. 704 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 704 Busch Carbide Tapered Fissure (Cone) Bur | Busch No. 33 023 – Crosscut – HP | Pack of 6
Regular price $36.99Unit price-
Busch & Co. GmbH
US No. 704 Busch Steel Tapered Fissure (Cone) Bur | Busch No. 38 023 – Crosscut – HP | Pack of 6
Regular price $19.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 704 Do You Need?
Both versions use the HP shank and differ by material; every active product in the collection is linked once below by its Busch number.
HP (straight handpiece)2 items
HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.
Speed and Technique
Keep the bur parallel to the intended path of insertion so the taper of the head becomes the taper of the wall; run both HP versions 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
- Laboratory and denture work: the HP carbide and steel versions cut acrylic, denture bases and plaster in the straight handpiece.
- Tapered reduction: the cone cuts walls with built-in taper, the same geometry used for crown and inlay walls.
At 2.3 mm the No. 704 is a wide cone for bulk reduction and laboratory cutting.
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. 703 Bur, US No. 705 Bur, US No. 706 Bur, Tapered Fissure (Cone) Burs, Dental Lab Carbide Burs, and Dental Lab Steel Burs. For bur numbering and dimensions, see the Busch Bur Size Chart and the Dental Bur Glossary.
Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary · Nearby sizes: US No. 702, US No. 703, US No. 705, US No. 706
FAQ
What is the Busch number for a US 704 bur?
Busch No. 33 023 in carbide (HP); Busch No. 38 023 in steel (HP).
What size is a No. 704 bur?
The No. 704 has a 2.3 mm head diameter (ISO size 023) on a tapered fissure bur head, ISO shape 168 (cone, flat end).
Carbide or steel?
Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 704 is the economical choice for acrylics, plaster and other soft materials in the laboratory.
Are Busch No. 704 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.
