Dry milling or wet milling is not a preference. It is a decision about which materials you can cut, what tool life you get, and how clean your lab stays. Buying the wrong machine for your case mix is an expensive mistake that shows up gradually, as chipped margins and worn tools.
How the two differ
Dry milling cuts the blank in air, with dust extraction. Wet milling floods the cutting zone with coolant and lubricant. The difference is not cosmetic: coolant removes heat, carries away swarf, and changes the forces on the tool.
What each is good at
- Dry milling: zirconia in the pre-sintered (chalky) state, wax, PMMA. Fast, simple, no coolant management.
- Wet milling: metals, glass-ceramics, fully dense materials, and zirconia where coolant is preferred for surface quality and tool life.
Choosing by case mix, not by habit
| Material | Dry | Wet |
|---|---|---|
| Pre-sintered zirconia | Yes | Yes |
| Wax | Yes | Not ideal |
| PMMA | Yes | Possible |
| Glass-ceramic | No | Yes |
| Metals / Ti | No | Yes |
Tool life and surface quality
Heat is the enemy of tool life. Wet milling keeps the cutting edge cooler, so burs last longer and the surface finish is usually better — which matters for zirconia, where surface damage can seed cracks that propagate during sintering. Dry milling compensates by using the right geometry and conservative feed rates, and by replacing burs on a schedule rather than on failure.
Practical considerations
- Coolant management is a real cost: filtration, microbial growth, disposal, and the risk of contamination.
- Dust extraction on dry machines is a health-and-safety requirement, not an accessory.
- Changeover between materials takes time and cleaning; a single machine doing both loses throughput.
- Validation: whichever route you use, verify margin accuracy and shrinkage on your own machine.
Frequently asked questions
Can I dry mill all zirconia?
Pre-sintered zirconia is commonly dry milled and gives good results with the right parameters. Some higher-translucency grades benefit from wet milling for surface quality. Test on your own machine with your own burs.
Does wet milling change the shrinkage factor?
Not in principle, but surface quality differences can affect how the unit performs. Re-verify the factor whenever you change route or material.
We supply blanks and burs matched to both routes, and we can advise on parameters for your machine. Tell us your mill, your materials and your case mix and we will reply with a recommendation within 24 hours. See also burs and polishing.
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