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dimensional obturation. During the process, the debris of the root canal system is pushed out from the canals, leading to treatment failure and flare-ups. 1 Many factors contribute to debris extrusion. According, 2 irrigation of the root canal space during instrumentation is one of the factors that led to an increased amount of debris extrusion. Teeth with necrotic pulp permitted more irrigant extrusion compared with vital teeth. The depth of file insertion into the root canal is another factor affecting debris extrusion. Studies conducted 3,4 showed that instrumentation short of apical foramen decreased the amount of debris extrusion with both endosonic and k-files. Canal preparation done with step-back techniques showed greater amount of periapical extrusion, whereas canal preparation having special design of nickel-titanium files with crown-down technique decreases the amount of extrusion periapically.2 The amount of apical extrusion can also vary according to the technique used. It is generally accepted that instrumentation techniques that incorporate rotational action generate less debris than push/ pull instrumentation, and the crown-down technique has been associated with the least amount of debris extrusion, compared with techniques involving a linear filing motion. Thus, engine-driven rotary systems have tended to extrude less debris than hand techniques. Recently, newer file system WaveOne Gold has been introduced, which was compared with F360, One Shape, and Reciproc.The Reciproc files are composed of M-Wire nickeltitanium, which offers increased flexibility. The reciprocating movement of the instrument reduces the risk of cyclic fatigue.One Shape files, on the contrary, employ traditional continuous rotation. They have a triangle-shaped cutting edge and two additional cutting edges, in the apical and coronal parts, as well as a cross-section that progressively changes from three to two cutting edges between the apical and coronal parts. This design offers optimal cutting action. 1,3 F360 has a double S-shaped cutting edges and a lower bending ability increasing the flexibility of file. It has a ABSTRACTIntroduction: Root canal therapy comprises three main steps, namely access preparation, biomechanical preparation, and three-dimensional obturation. During the process, the debris of the root canal system is pushed out from the canals, leading to treatment failure and flare-ups.

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