Abstract
Introduction Profile GT files have been redesigned and are now marketed as GTX nickel-titanium rotary files. Methods A double-digital radiographic technique was used to compare apical transportation (AT) and change in working length (CWL) between Profile GT and GTX rotary files. Mesiobuccal canals of 40 extracted mandibular molars were instrumented by either rotary system. The central axes of preoperative (15 K) and master apical rotary file (30/.04) were digitally superimposed. AutoCAD was used to measure AT at 0, 1, and 3 mm from WL. The distance from the file tip to the set WL indicated any CWL. Analysis of variance test showed no significant differences between groups in AT. Results CWL in GTX (−0.25 ± 0.42) group was significantly greater than in Profile GT group (0.17 ± 0.30). Conclusions The AT results indicate that the newly designed GTX rotary instruments are as effective as the older Profile GT instruments.
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