Cyclic Fatigue, Shaping Ability and Apical Transportation of Endodontic Rotary Instruments Made From Different Niti Alloys in Simulated S-Shaped Root Canal
DDS Justina Sinkevičiūtė, DDS Roberta Danilaitė, DDS, PhD Greta Lodienė

Summary
Aim: investigate the influence of NiTi alloy on cyclic fatigue resistance and fracture, shaping ability and apical transportation of rotary endodontic instruments in artificial S-shaped canals. Results: No instrument fractured. The greatest apical transportation was observed in the R group, the least– in the GOLD group. R group showed greater canal deviation at coronal and apical parts compared to other groups (p<0.05). CM group removed less resin at middle part, compared with the GOLD group. The minimal canal deviation in the apical curvature was observed in the GOLD group, while in the coronal curvature in the CM group. Conclusions: Instruments were resistant to fracture. Protaper GOLDTM instruments caused minimal apical transportation and apical canal deviation, Hyflex® CM instruments - coronal canal deviation.

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