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05) in the percentage increase of volume (107.50% - 93.13%), surface area (27.74% - 29.68%) or untouched canal wall (13.08% - 11.74%) between XP-S and PTN X4, respectively. CONCLUSIONS The XP-endo Shaper system (single-file) with an extra 45 seconds of instrumentation and the ProTaper Next system (multiple files) had a similar root canal shaping ability. Neither technique was able to fully prepare the long oval-shaped canals of mandibular incisors. This article is protected by copyright. All rights reserved.A growing number of field stu