Ultra Metal & Crown cutters

Carbide crown cutting burs for metal, PFM and zirconia crowns

Eagle Ultra Metal & Crown cutters are FG carbide crown cutting burs made for one job: getting failed restorations off quickly and predictably. Machined from single-piece tungsten carbide, these metal cutting burs slice through full metal crowns, PFM copings, bridges and amalgam without stopping to swap instruments. Each pack holds 5 burs of one shape, and every shape fits any standard high-speed handpiece.

Choose the right crown cutter bur shape

The M3 is the everyday crown removal bur: its rounded tip reduces the risk of gouging the preparation underneath. Step up to the wider M31 when the metal is thick and speed matters. The compact K2R football reaches second molars and tight spaces, while the F09 gives a defined, straight cutting edge along its full length.

Cutting metal, PFM and zirconia crowns

• Full metal and gold-alloy crowns: this is where carbide shines. The blades shear metal rather than grind it, so the cut stays fast and controllable.
• PFM crowns: open the porcelain layer first, then let the carbide take over once you reach the metal coping. Expect porcelain to dull the blades faster than metal does.
• Zirconia and all-ceramic crowns: zirconia is hard on any cutting instrument. Use light pressure, generous water and short passes, and replace the bur as soon as cutting slows. For monolithic zirconia and lithium disilicate, many clinicians prefer a coarse diamond, such as the burs in our Crown Removal Kit.
• Amalgam: the K2R and M31 remove old amalgam efficiently and leave a clean cavity to work in.

How to section and remove a crown, step by step

1. Plan the cut. Check the radiograph for the crown's margins, post or core, and the position of the pulp.
2. Cut buccal to occlusal. Start at the buccal margin and cut a vertical groove up the buccal wall and across the occlusal surface toward the lingual.
3. Stay just through the crown. Cut only through the restoration thickness. Watch for the change in color and feel as you reach cement or core material.
4. Extend to the margin. Carry the cut down to, but not past, the margin to protect the tooth and gingiva.
5. Spread and lift. Insert a crown spreader or elevator into the slot and twist gently to split the crown, then lift it off. A second cut on the lingual side helps with stubborn crowns.

Speed and cooling tips

• Run the burs in a high-speed handpiece with full water spray. Water keeps the tooth and bur cool and clears debris from the blades.
• Let the blades do the work. Heavy pressure creates heat and chatter and shortens bur life.
• Use a light, sweeping motion instead of holding the bur in one spot.
• Seat the FG shank fully in the chuck before every use to keep the bur running true.

Carbide vs diamond crown cutters

Carbide crown cutters cut by shearing, which makes them the first choice for metal: full cast crowns, metal copings, posts and amalgam. Diamond burs cut by abrasion, which suits porcelain, lithium disilicate and zirconia. For a PFM crown, the two work well together: diamond through the porcelain, carbide through the metal. Keeping both on the tray lets you switch the moment the material changes. You can browse the full range of carbide burs for other restorative and surgical tasks.

Care and sterilization

• Clean the burs right after use with a bur brush or ultrasonic cleaner to remove cement and metal debris.
• Rinse and dry thoroughly before sterilizing to help prevent corrosion.
• Autoclave following standard dental protocols, ideally in a bur block.
• Retire a bur when it cuts more slowly, vibrates or shows chipped blades. A sharp crown cutting bur is faster and safer than a worn one.

What's in the pack

5 Ultra Metal & Crown cutters of your chosen shape (M3, M31, K2R or F09), FG shank for high-speed handpieces.