Abstract

The aim of the present in vitro study was to evaluate the shaping ability of two rotary nickel-titanium endodontic systems in canals with different angles of curvatures, on periapical X-rays. Material and methods. 10 recently extracted human teeth with a total number of 15 canals were included in this study. Digital periapical X-rays were taken after the access cavities were performed and the degrees of curvatures were measured for each canal using a dedicated software program. Teeth were divided than into two Groups: Group 1 (n=5, 8 canals) - shaping was performed with Twisted Files and Group 2 (n=5, 7 canals) - shaping was performed with Twisted Files Adaptive. Only one set of instruments was used for all the canals belonging to one group. Post-instrumentation radiographs were taken, the curvatures were measured again, and the differences between the before/after angles were calculated. Results. The region of the curvature was located in the middle third of the root canal for all samples. In both Groups, the reduction of the curvature's angle after shaping was observed, with variations between 0.5 and 11.5°, which is normal because of the enlargement of the body of the canal, done by the tapered instruments during shaping. Conclusions. Both systems offer the capacity to shape canals with curvatures located in the middle third, without alterations of the original root canal anatomy.

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