US No. 1158 Bur – Busch Straight Fissure Carbide, Made in Germany
The US No. 1158 is the American number for a straight fissure bur with a 1.2 mm head (ISO size 012): a parallel-sided cylinder with a rounded end, so it cuts straight walls with rounded internal line angles. Busch & Co. manufactures it in Germany as Busch No. 21R 012. Every US No. 1158 on this page is a genuine Busch instrument and ships from our US warehouse.
Busch & Co. GmbH
US No. 1158 Busch Carbide Straight Fissure (Cylinder) Round Bur | Busch No. 21R 012 – FG | Pack of 6
Regular price $40.99Unit price-
Busch & Co. GmbH
US No. 1158 Busch Carbide Straight Fissure (Cylinder) Round Bur | Busch No. 21R 012 – HP | Pack of 6
Regular price $40.99Unit price
Reference pages already linked from this collection, in one place.
Which US No. 1158 Do You Need?
Choose by shank first; every active product in the collection is linked once below by its Busch number.
FG (high-speed handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 21R 012 | 1158 | Carbide | Plain-cut | FG | High-speed handpiece, rounded end | 6 |
HP (straight handpiece)1 items
| Busch No. | US No. | Material | Cut | Shank | Best for | Pack |
|---|---|---|---|---|---|---|
| 21R 012 | 1158 | Carbide | Plain-cut | HP | Straight handpiece: laboratory and denture work, rounded end | 6 |
FG (friction grip, 1.6 mm shank, high-speed handpiece). HP (2.35 mm shank, straight handpiece). See the Busch Bur Size Chart for head and shank dimensions.
Speed and Technique
Run the FG version in the high-speed handpiece with continuous water spray and light, intermittent pressure; let the blades do the work. The HP version runs 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
- Cavity preparation: opening through enamel and establishing the straight walls and flat floor of Class I and Class II preparations, including proximal boxes.
- Restoration removal: cutting out old amalgam and composite.
- Sectioning: dividing crowns and multi-rooted teeth.
- Laboratory and denture work: the HP carbide version trims acrylic, adjusts denture bases and reduces plaster models in the straight handpiece.
At 1.2 mm the No. 1158 is the standard operative size.
The No. 1158 is plain-cut; its crosscut twin in the same shape and size is the US No. 1558 (Busch 31R 012). Crosscut blades cut faster and clear debris; plain-cut blades leave a smoother wall.
Care and Reconditioning
Busch carbide 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. 1157 Bur, US No. 1159 Bur, US No. 1558 Bur, Cylinder Round Burs, and Straight Fissure (Cylinder) 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. 1157, US No. 1159
FAQ
What is the Busch number for a US 1158 bur?
Busch No. 21R 012 in carbide (FG/HP).
What size is a No. 1158 bur?
The No. 1158 has a 1.2 mm head diameter (ISO size 012) on a straight fissure bur head, ISO shape 137 (cylinder, round end).
What is the difference between a No. 1158 and a No. 1558?
Same shape and size; one is plain-cut and the other crosscut. The No. 1158 is plain-cut — crosscut cuts faster and clears debris, plain-cut leaves a smoother surface.
Are Busch No. 1158 burs reusable?
Yes. Carbide burs are cleaned, disinfected and sterilized between patients and replaced when they dull; the Bur Sterilization Guide gives the validated steps.
