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Amann Girrbach Milling Burs
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Uncoated Milling Burs for PMMA, Wax and PEEK on Ceramill Mills
Eagle uncoated milling burs are made for soft, non-abrasive materials: PMMA, wax and PEEK. They are compatible with Amann Girrbach Ceramill milling units and come in four diameters (0.3, 0.6, 1.0 and 2.5 mm), each sold as a separate option.
Why Uncoated Burs for Soft Materials
Soft materials do not need a diamond coating. An uncoated carbide edge is the sharpest edge you can mill with, and it cuts PMMA, wax and PEEK cleanly instead of rubbing them. Clean cutting keeps heat down, which helps prevent melted or smeared PMMA and torn wax edges. A diamond coating rounds the edge slightly; that helps in abrasive zirconia but is not needed here.
What You Can Mill
| Material | Typical restorations |
|---|---|
| PMMA | Temporary crowns and bridges, long-term provisionals, try-ins |
| Wax | Burn-out patterns for pressing and casting |
| PEEK | Frameworks and other high-performance polymer restorations |
Sizes and What Each One Does
| Size | Main job | Typical areas |
|---|---|---|
| 0.3 mm | Finest detail | Fissures, margins, tight areas |
| 0.6 mm | Detail and anatomy | Occlusal anatomy, inner surfaces |
| 1.0 mm | Finishing and contouring | Outer surfaces of crowns and bridges |
| 2.5 mm | Roughing | Fast bulk removal |
How to Read the Sizes
The number on each option is the cutting diameter in millimeters. Your Ceramill software assigns each diameter to a tool position, so replace a worn bur with one of the same diameter. Check the tool list in your software before you order to see which positions are worn.
Uncoated vs CVD Diamond vs DLC
- Uncoated carbide: the sharpest edge, best for soft, non-abrasive materials like PMMA, wax and PEEK.
- CVD diamond: a crystalline diamond layer for abrasive zirconia.
- DLC (diamond-like carbon): a thin, low-friction carbon coating, not true crystalline diamond.
Many labs keep one set of uncoated burs for soft materials and a separate set of CVD burs for zirconia, so neither tool is worn by the wrong material.
Compatibility
These burs are compatible with Amann Girrbach Ceramill milling units. Ceramill units do not all use the same collet and shank size, so before you order, check the collet size and the tool table of your machine and make sure they match these burs. They are Eagle-brand burs, not original Amann Girrbach tools. Register each new bur in your software and reset its usage time, as you would with any replacement tool.
When to Replace PMMA and Wax Milling Burs
Soft materials wear burs more slowly than zirconia, but the edge still dulls over time. Replace the bur when you notice:
- Melted or smeared PMMA on the restoration surface
- Fuzzy or torn edges on wax patterns
- Chips sticking to the bur or clogging the flutes
- Rougher surfaces or longer milling times than usual
- A chipped edge or bent tip
- A tool-life warning in your milling software
Tips for Longer Bur Life and Better Surfaces
- Use these burs only for PMMA, wax and PEEK, not for zirconia.
- Use the strategy your software recommends for each material.
- Clean chips from collets and tool holders so the bur seats correctly.
- Store spare burs in their packaging so the cutting edges do not chip.
- Do not reuse a bur that was dropped or shows a damaged edge.
- If PMMA starts to smear, replace the bur before changing other settings.
Common Problems and Bur-Related Causes
- Melting or smearing in PMMA: a dull bur generating heat, or a coated bur used where a sharp edge is needed.
- Rough wax surfaces: a worn bur or chips building up in the flutes.
- Broken small bur: a worn tool, a bur not seated straight or debris in the collet.
- Poor fit of temporaries: worn burs on inner surfaces; also check machine calibration.
Milling zirconia on the same unit? Use our CVD diamond zirconia milling burs. For other machines, browse all dental CAD/CAM milling burs.
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