The machining process of using rotary cutters (burs) to remove material from a workpiece by advancing (or feeding) in a direction at an angle with the axis of the tool. It covers a wide variety of different operations and machines, on scales from small individual parts to large, heavy-duty milling operations. It is one of the most commonly used processes to fabricate dental restorations with high precision. Mills have multiple axis (e.g., 3-axis, 4-axis, 5-axis) that determine the ability of the milling process to create final detail and complex geometries with undercuts, concave contours, and holes.

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