The Instrument Removal System (iRS) provides another mechanical method for the removal of intracanal obstructions such as silver points, carrier-based obturators or broken file segments.The iRS is indicated when ultrasonic efforts prove to be unsuccessful and may be used to remove broken instruments that are lodged in the straightaway portions of the root or partially around the canal curvature. The black instrument has an outside diameter of 1.00 mm and is designed to work in the coronal onethird of larger canals, whereas the red and yellow instruments have outside diameters of 0.80 and 0.60 mm, respectively, and can be placed deeper into more narrow canals. Each complete instrument is comprised of a color coordinated microtube and screw wedge Each microtube has a small-sized plastic handle to enhance vision during placement, a side window toimprove mechanics, and a 45° beveled end to "scoop up" the coronal end of a broken instrument. Each screw wedge has a knurled metal handle, a left handed screw mechanism proximally, and a solid cylinder that transitions into 0.02 tapered K-type file blades towards its distal end to facilitate engaging an obstruction
REF :JOE 2004.
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