US No. 39 Bur – Busch Inverted Cone Carbide & Steel, Made in Germany
The US No. 39 is the American number for an inverted cone bur with a 1.8 mm head (ISO size 018): a head that widens toward the tip, so it cuts undercuts and flat floors that a round or cylinder bur cannot. Busch & Co. manufactures it in Germany as Busch No. 2 018. Every US No. 39 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 39 Busch Carbide Inverted Cone Bur | Busch No. 2 018 – HP | Pack of 6
Regular price $36.99Unit price-
Busch & Co. GmbH
US No. 39 Busch Steel Inverted Cone Bur | Busch No. 2 018 – HP | Pack of 6
Regular price $17.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 39 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
Because the widest cutting edge is at the tip, work with the side of the head in short strokes rather than plunging; 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
- Retention and relief: cutting undercuts, retention channels and relief in acrylic and plaster, where the head widening toward the tip forms the lock.
- Flat floors: squaring and flattening the floor of a cut in acrylic or plaster.
At 1.8 mm the No. 39 is a large head for prosthetic and laboratory reduction.
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. 38 Bur, US No. 40 Bur, US No. 41 Bur, Inverted 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. 37, US No. 38, US No. 40, US No. 41
FAQ
What is the Busch number for a US 39 bur?
Busch No. 2 018 in carbide (HP); Busch No. 2 018 in steel (HP).
What size is a No. 39 bur?
The No. 39 has a 1.8 mm head diameter (ISO size 018) on an inverted cone bur head, ISO shape 010 (inverted cone).
Carbide or steel?
Tungsten carbide for enamel, dentin, composite and amalgam in the clinic; the steel No. 39 is the economical choice for acrylics, plaster and other soft materials in the laboratory.
Are Busch No. 39 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.
