A term that we are probably not using correctly is “milling.” We’ve always used “milling” as a term for the machining of our block materials.
“Milling” must be differentiated with “grinding” because it is different in the software. “Grinding” is what we are all used to: diamond burs grinding off material in planes to make the shape and ending with one sprue.
“Milling” is using carbide burs to cut into the block with a punching motion. A large carbide does the majority of the work, and then a finer finishing bur completes the details. There may be multiple sprue connections. It is currently limited to bis-acrylics and zirconia. The finished is very smooth and the polishing procedure is reduced.