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； comparing an original scan file and an output to be produced from an original toolpath to verify the dental prothesis, and generating a new toolpath if desired； creating 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.
