US No. 703 Bur – Busch Tapered Fissure Carbide & Steel, Made in Germany
The US No. 703 is the American number for a tapered fissure bur with a 2.1 mm head (ISO size 021): a cone that narrows toward the tip, so the walls it cuts diverge toward the occlusal: the geometry crown and inlay preparations depend on.
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Busch & Co. manufactures it in Germany as Busch No. 33 021 and Busch No. 38 021, plus the surgical 703X (Busch No. 33RL 018). Every US No. 703 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 703 Busch Carbide Tapered Fissure (Cone) Bur | Busch No. 33 021 – Crosscut – HP | Pack of 6
Regular price $36.99Unit price-
Busch & Co. GmbH
US No. 703 Busch Steel Tapered Fissure (Cone) Bur | Busch No. 38 021 – Crosscut – HP | Pack of 6
Regular price $19.99Unit price -
Busch & Co. GmbH
Regular price $24.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 703 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-XL (surgical length)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 33RL 018 | 703X | Carbide | Crosscut | FG-XL (25 mm) | Surgical: sectioning and extended reach; rounded end | 2 |
HP (straight handpiece)2 items
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
Keep the bur parallel to the intended path of insertion so the taper of the head becomes the taper of the wall; use water spray with the FG versions and laboratory speed for HP. 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
- Crown preparation: axial reduction with built-in taper for full-coverage crowns and bridge abutments.
- Inlay and onlay preparation: cavity walls that diverge toward the occlusal for a path of insertion.
- Cavity preparation: extending and shaping preparations where a flat floor and tapered walls are wanted.
- Sectioning and laboratory work: the surgical-length versions section teeth and roots; the HP carbide and steel versions cut acrylic and plaster in the straight handpiece.
At 2.1 mm the No. 703 is a wide cone for bulk reduction and laboratory cutting.
The 703X is the surgical version: a tapered crosscut head (Busch 33RL 018) on a 25 mm FG-XL shank for reach when sectioning teeth and roots, with a rounded end.
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. 1703 Bur, Tapered Fissure (Cone) Burs, Surgical Length Extra Long Burs (FG-XL), Oral Surgery Burs, and HP Burs for the Straight Handpiece. 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. 701, US No. 702, US No. 704, US No. 705
FAQ
What is the Busch number for a US 703 bur?
Busch No. 33 021 in carbide (HP); Busch No. 38 021 in steel (HP). The 703X is Busch 33RL 018.
What size is a No. 703 bur?
The No. 703 has a 2.1 mm head diameter (ISO size 021) on a tapered fissure bur head, ISO shape 168 (cone, flat end).
What do the letters after No. 703 mean?
The 703X is the surgical version: a tapered crosscut head (Busch 33RL 018) on a 25 mm FG-XL shank for reach when sectioning teeth and roots, with a rounded end.
Carbide or steel?
Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 703 is the economical choice for acrylics, plaster and other soft materials in the laboratory.
Are Busch No. 703 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.
