Milling machines have been an industry-standard in dental laboratories for many years. Zirconia is the primary material that is milled on our 5-axis milling machines. Zirconia is milled in a green state and then it is fired in an oven for up to 6.5 hours allowing the material to shrink and harden.  Full Contour Zirconia crowns are one of the fastest-growing restorations due to their strength and fit.