US No. 331 Bur – Busch Pear Carbide, Made in Germany

The US No. 331 is the American number for a pear bur with a 1 mm head (ISO size 010): a rounded, slightly tapered head that cuts a preparation with rounded internal line angles and no sharp corners. Busch & Co. manufactures it in Germany as Busch No. 7 010 and Busch No. 25R 010. Every US No. 331 on this page is a genuine Busch instrument and ships from our US warehouse.

Which US No. 331 Do You Need?

US No.	Busch No.	Material	Cut	Shank	Best for	Pack
331	7 010	Carbide	Plain-cut	FG	High-speed handpiece	6
331L	25R 010	Carbide	Plain-cut	FG	Longer head for deeper preparations, rounded end	6

FG (friction grip, 1.6 mm shank, high-speed handpiece). See the Busch Bur Size Chart for head and shank dimensions.

Clinical Uses of the US No. 331

Conservative Class I and Class II preparations: the pear outline removes only what is needed and leaves rounded internal angles that suit composite and amalgam alike.
Minimally invasive access: opening a fissure or a small lesion without extending the preparation beyond the defect.
Refining internal form: smoothing line angles and slight undercuts in an existing preparation.

At 1 mm the No. 331 is a mid-size pear for standard Class I and II work.

The 331L (Busch 25R 010) carries a longer cutting head for deeper boxes and taller walls.

Speed and Technique

Use in the high-speed handpiece with water spray, entering with the tip and shaping with the sides in short strokes; the rounded form does the finishing of the internal angles for you. 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 331 bur? Busch No. 7 010 in carbide (FG). The 331L is Busch 25R 010.

What size is a No. 331 bur? The No. 331 has a 1 mm head diameter (ISO size 010) on a pear bur head, ISO shape 232 (pear).

What do the letters after No. 331 mean? The 331L (Busch 25R 010) carries a longer cutting head for deeper boxes and taller walls.

Are Busch No. 331 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. 330, US No. 332, US No. 333