The document describes a new digital dentistry system from IOS Technologies that uses a unique polar motion system with rotary stages instead of traditional Cartesian motion to drastically reduce costs without compromising performance. The system includes an intraoral scanner, CAD software, and a TS150 in-office milling machine. The milling machine uses a pair of opposing rotary stages and a linear Z-axis stage controlled through a polar coordinate system to position the cutting tool. This non-intuitive approach improves stiffness, smoothness of motion, accuracy, and ease of sealing compared to an equivalent Cartesian system, allowing the digital dentistry system to be 40% cheaper while producing crowns within 30 microns of tolerance in about 15 minutes.