A method is disclosed to fabricate a dental prosthesis by obtaining an image of the patient's dentition and generating a three-dimensional model of the dentition； positioning a portion of the dentition into a computer model of a mill blank； defining a margin region surrounding a dental object； defining an abutment ditch outside of said margin； generating a milling model having two virtual portions including the margin region and the abutment ditch region； and milling the dental prosthesis with a differential speed, wherein the milling of the abutment ditch portion is done at a higher speed than the milling of the prosthesis portion.
