Surgical Bur Guide – Bone Cutters, Shank Lengths & Oral Surgery Bur Selection
Oral surgery burs differ from restorative burs in three ways: longer shanks to reach the surgical field past retracted tissue, blade geometries cut for bone rather than enamel, and heat behavior that determines whether the osteotomy heals or necroses. This guide maps the Busch surgical bur range — shank lengths, bone cutter figures, and selection by procedure — for the German rotary side of the extraction and implant workflow.
Revised on September 30, 2026
Surgical Shank Lengths Explained
| Shank | Length | Handpiece | When to Use |
|---|---|---|---|
| FG | Standard (19 mm) | High-speed turbine | Accessible sites, tooth sectioning at the crown level |
| FG-LG | 21 mm | High-speed turbine | Surgical length — sectioning below the gingival margin, third molar access |
| FG-XL | 25 mm | High-speed turbine | Extra-long reach for deep impactions and distal sites |
| RA | Standard (22 mm) | Contra-angle / surgical handpiece | Torque-controlled bone work at lower speeds with irrigation |
| RA-L | 26 mm | Contra-angle / surgical handpiece | Surgical length for osteotomy and bone recontouring |
| RA-XL | 34 mm | Contra-angle / surgical handpiece | Maximum reach — deep impactions, posterior mandible |
Bone Cutter Figures
| Busch Figure | Design | Primary Use |
|---|---|---|
| 161 / 162 / 162A | Tapered (cone) pointed carbide bone cutters, Lindemann-type fluting | Osteotomy, tooth sectioning, bone removal around impactions — the workhorse surgical figures, available FG through RA-L |
| 166 / 166A | Larger tapered pointed bone cutters (021) | Bulk bone reduction and alveoloplasty where a wider taper clears faster |
| 164 LA Bone Cutter | Busch exclusive crosscut bone cutter, surgical length | Efficient, low-chatter bone cutting with reduced clogging — the flagship of the surgical line |
| Surgical round carbides | Round figures in surgical shank lengths | Access windows, apicoectomy, bone smoothing at the osteotomy margin |
Browse the complete Oral Surgery Bur Collection — every figure manufactured by Busch & Co. in Engelskirchen, Germany, since 1905.
Selection by Procedure
- Third molar sectioning: 161/162 in FG-LG or FG-XL. The length reaches the distal aspect, and the taper sections crown from roots in controlled cuts.
- Buccal bone removal: 162 or the 164 LA in RA-L on a surgical handpiece with irrigation. In bone, torque control beats turbine speed.
- Apicoectomy: a surgical-length round carbide for the access window, then fine figures for root-end work.
- Alveoloplasty: 166/166A for bulk reduction, then rongeurs and bone files for the final contour.
- Torus reduction and exostosis removal: the same bulk-reduction approach as alveoloplasty. Reduce the overgrowth with surgical-length bone cutters such as the 166/166A under copious irrigation, then smooth the surface with bone files.
Heat Is the Enemy
Bone necroses at sustained temperatures above roughly 47°C — a threshold a dry, dull, or overloaded bur crosses in seconds. The rules: continuous external irrigation, light intermittent pressure, sharp carbide (replace surgical burs frequently — they are consumables, not instruments), and speed matched to the bur per our Dental Bur Speed Chart. Single-patient reprocessing guidance is in the Bur Sterilization Guide.
Treat surgical burs as consumables. An edge dulls faster in bone than intuition suggests, and a dull cutter is itself a heat source, so inspect every surgical bur after each case and replace it early.
The Complete Surgical Workflow
Rotary bone work sits inside a hand-instrument sequence: flap reflection with a periosteal elevator, sectioning and osteotomy with the burs above, luxation and delivery per the Extraction Forceps Numbers Guide, then socket management with rongeurs and bone curettes. For bur identification across systems, the US Bur Number Finder and Bur Comparison Chart cross-reference Busch figures to Komet, Brasseler, and other numbering.
Frequently Asked Questions
What burs are used in oral surgery?
Tapered carbide bone cutters (Busch figures 161–166A, including crosscut 164 LA patterns) for osteotomy and sectioning, and surgical round carbides for access and apicoectomy — in surgical shank lengths (FG-LG, FG-XL, RA-L, RA-XL) to reach past retracted tissue.
What is the difference between a surgical bur and a regular bur?
Shank length (21–34 mm vs. standard), blade geometry cut for bone rather than enamel, and typically fewer, deeper flutes that clear bone chips without clogging.
What is a Lindemann bur?
A tapered, fluted carbide bone cutter designed for efficient side-cutting in bone — the design family behind the Busch 161/162 figures, used for sectioning impacted teeth and osteotomy.
What speed should bone cutting burs run at?
Lower speeds with high torque and continuous irrigation — consult the Bur Speed Chart for figure-specific maximums; exceeding them generates the heat that damages bone.
Can I use regular burs for oral surgery?
Standard-length restorative burs lack the reach for most surgical sites, and their fine fluting clogs in bone and generates heat. Surgical-length bone cutters exist because restorative geometry fails on both counts.
FG or RA for bone removal?
RA or RA-L on a surgical handpiece is preferred for osteotomy: lower speed, higher torque, and compatibility with external irrigation. FG surgical lengths excel at high-speed tooth sectioning.
How often should surgical burs be replaced?
Inspect after every case and err toward early replacement. A fresh carbide costs little compared with the thermal bone damage a dull one can cause.
Part of our Oral Surgery Instruments hub.
