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(A) Scanning Environmental Microscope image of the tip of a Grinded Niti file. (B) Scanning Environmental Microscope image of the tip of an Electrical Discharge Machined Niti file. The EDM procedure creates a rough surface in the tip of the instrument, making the tip active when activated and increasing the cutting efficiency of the file (images courtesy of Dr. Alexey Volokitin, city of Dnepr, Ukraine).
