US No. 702 Bur – Busch Tapered Fissure Carbide & Steel, Made in Germany

The US No. 702 is the American number for a tapered fissure bur with a 1.6 mm head (ISO size 016): 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. 33 016 and Busch No. 38 016 (plus 2 further variants below). Every US No. 702 on this page is a genuine Busch instrument and ships from our US warehouse.

Which US No. 702 Do You Need?

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.

Clinical Uses of the US No. 702

• 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 1.6 mm the No. 702 is a wide cone for bulk reduction and laboratory cutting.

The 702L (Busch 33L 016) carries a longer cutting head for deeper boxes and taller walls. The 702X 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. 702 is crosscut; its plain-cut twin in the same shape and size is the US No. 172 (Busch 23 016). 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.

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-certified quality management and guaranteed to arrive free of manufacturing defects under our Busch arrival guarantee.

FAQ

What is the Busch number for a US 702 bur? Busch No. 33 016 in carbide (FG/HP); Busch No. 38 016 in steel (HP). The 702L is Busch 33L 016; the 702X is Busch 33RL 016.

What size is a No. 702 bur? The No. 702 has a 1.6 mm head diameter (ISO size 016) on a tapered fissure bur head, ISO shape 168 (cone, flat end).

What is the difference between a No. 702 and a No. 172? Same shape and size; one is plain-cut and the other crosscut. The No. 702 is crosscut — crosscut cuts faster and clears debris, plain-cut leaves a smoother surface.

What do the letters after No. 702 mean? The 702L (Busch 33L 016) carries a longer cutting head for deeper boxes and taller walls. The 702X 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.

Carbide or steel? Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 702 is the economical choice for acrylics, plaster and other soft materials in the laboratory.

Are Busch No. 702 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.

Related resources: US Bur Number Finder · Bur Comparison Chart · Speed Chart · Bur Glossary · Nearby sizes: US No. 700, US No. 701, US No. 703, US No. 704