Abstract: 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.