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Often times this can not be totally accomplished,218 but so long as the apical sector can be cleaned and obturated, the prognosis must not be negatively affected. The usage of Greater Taper (GT) Ni, Ti hand files (DENTSPLY Tulsa Dental) for the blending of ledges has been advocated. 163 The benefit these instruments have is that they are nonend cutting, and their rate of taper is 2 to 6 times that of traditional 0.

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02 tapered hand files. When the ledge has been bypassed and the canal can be negotiated with a conventional size # 15 or # 20 K-file, a GT hand file is chosen. The K-file develops a pilot hole so the pointer of the GT file can passively follow this glide course beyond the ledge.

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2 mm (# 20) and a taper that will vary depending on the requirements of the preparation. The largest taper that will go into the apical sector is utilized; however, these instruments need to be precurved, which provides an obstacle because they are made from nickel-titanium alloy. To precurve this superelastic shape-memory alloy, a file-bending tool such as the Endo Bender Pliers (Sybron, Endo) is needed.

At this time, the proper tapered GT file is then brought into the canal, and the rubber stop is oriented so that the instrument's precurved working end can bypass and move apical to the ledge.  A Good Read  is then worked to length, and the ledge is either reduced or removed (Fig.