Crown Cutter Selection Guide: Which Bur Cuts Which Crown?
Sectioning a crown is a race between your bur and the chair clock — and the right cutter for the restoration material wins it. Busch & Co. builds four crown cutter families, each matched to specific materials. This guide maps them, straight from Busch's official application matrix.
The selection matrix
| Cutter family | Non-precious (NEM) alloys | High-gold PM alloys | Gold-reduced PM alloys | Metal-ceramics (PFM) | Zirconia & full ceramic |
|---|---|---|---|---|---|
| Double Cut — 21RX, 23RX | |||||
| Fine Crosscut — 34, 36R, 38R | |||||
| Diamond Cut — 34D, 36RD, 38RD, 36RDL, 38RDL | |||||
| ZIRAMANT — 6880Z, 6855Z |
Carbide crown cutters (double cut, fine crosscut, diamond cut) run at 180,000 – 200,000 min⁻¹; ZIRAMANT cutters at 140,000 – 160,000 min⁻¹. Use adequate water cooling when sectioning, and see our Speed Chart for the full picture.
By restoration material
Non-precious metal (NEM) crowns — fine crosscut or diamond cut. The 34, 36R, and 38R fine crosscut cutters are purpose-built for hard non-precious alloys, slicing chrome-cobalt and nickel-chrome copings efficiently. The diamond-cut series handles them too if you prefer one universal cutter.
Gold and precious-metal (PM) crowns — double cut. High-gold and gold-reduced alloys are comparatively soft and tend to smear finer toothings; the 21RX and 23RX double-cut cutters take clean, fast bites instead. The diamond-cut series covers these alloys as well.
Porcelain-fused-to-metal (PFM) crowns — diamond cut. PFM is the two-material problem: veneering ceramic over a metal coping. The 34D, 36RD, and 38RD diamond-cut cutters are the only carbide family rated for metal-ceramics, cutting through both layers with exceptionally smooth running and secure guidance. Alternatively, open the ceramic layer first with a coarse-grit diamond, then section the metal coping with a crown cutter — Busch's catalog endorses exactly this two-step approach.
Zirconia and full-ceramic crowns — ZIRAMANT. Carbide blades don't cut sintered zirconia; its hardness demands diamond abrasion. The ZIRAMANT 6880Z and 6855Z crown cutters carry Busch's special diamond coating engineered for zirconia, run at the reduced 140,000–160,000 min⁻¹ range, and a coarse-grit diamond instrument is the endorsed alternative for the veneering ceramic.
Choosing the working length
The diamond-cut family comes in three working-part lengths: 34D (short) for controlled starts and occlusal access, 36RD / 38RD (medium) for general sectioning, and 36RDL / 38RDL (long) for deep slots and molar crowns cut in one pass. All are available in sizes 010 and 012.
FAQ
What bur removes a zirconia crown? A zirconia-specific diamond cutter such as the ZIRAMANT 6880Z or 6855Z, or a coarse-grit diamond instrument — not a standard carbide crown cutter.
What speed for crown cutting? Busch specifies 180,000–200,000 min⁻¹ for its carbide crown cutters and 140,000–160,000 min⁻¹ for ZIRAMANT, with water cooling.
Can one cutter do every crown? The diamond-cut series comes closest, covering all metal and metal-ceramic crowns — but sintered zirconia always requires diamond abrasion.
Shop the full Busch Crown Cutter collection and the Crown Cutting procedure collection. All Busch instruments are manufactured by Busch & Co. in Engelskirchen, Germany. Application data is from official Busch documentation; clinical judgment and the instrument packaging govern actual use. See also our Comparison Chart, Color Coding Guide, and Glossary.
