US No. 698 Bur – Busch Tapered Fissure Carbide & Steel, Made in Germany

The US No. 698 is the American number for a tapered fissure bur with a 0.8 mm head (ISO size 008): 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. 33 008 and Busch No. 38 006. Every US No. 698 on this page is a genuine Busch instrument and ships from our US warehouse.

Which US No. 698 Do You Need?

US No.	Busch No.	Material	Cut	Shank	Best for	Pack
698	33 008	Carbide	Crosscut	HP	Straight handpiece: laboratory and denture work	6
698	38 006	Steel	Crosscut	HP	Economical laboratory cutting of acrylics and plaster	6

HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.

Clinical Uses of the US No. 698

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 0.8 mm the No. 698 is a fine cone for conservative preparations and narrow boxes.

The No. 698 is crosscut; its plain-cut twin in the same shape and size is the US No. 168 (Busch 23 008). 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.

Dental Instruments, Tools, Burs, Diamonds and Polishers Made In Germany

FAQ

What is the Busch number for a US 698 bur? Busch No. 33 008 in carbide (HP); Busch No. 38 006 in steel (HP).

What size is a No. 698 bur? The No. 698 has a 0.8 mm head diameter (ISO size 008) on a tapered fissure bur head, ISO shape 168 (cone, flat end).

What is the difference between a No. 698 and a No. 168? Same shape and size; one is plain-cut and the other crosscut. The No. 698 is crosscut — crosscut cuts faster and clears debris, plain-cut leaves a smoother surface.

Carbide or steel? Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 698 is the economical choice for acrylics, plaster and other soft materials in the laboratory.

Are Busch No. 698 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. 699, US No. 700