Surface evaluation of milled chairside CAD/CAM materials based on manufacturing speed.

Based on the limitations of the present study, the milling speed was found to influence the surface roughness of dry milled and sintered zirconia, with slower speeds resulting in smoother surfaces. The largest improvement in surface roughness occurred between the Super Fast and Fast milling speeds, with a smaller incremental improvement in surface roughness with Fine milling in the Primemill. All recorded surface roughness values were within the expected range of values to be able to efficiently hand polish a clinically acceptable surface finish.