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Brazilian Journal of Oral Sciences
Piracicaba Dental School - UNICAMP
EISSN: 1677-3225
Vol. 14, No. 2, 2015, pp. 122-125
Bioline Code: os15020
Full paper language: English
Document type: Research Article
Document available free of charge

Brazilian Journal of Oral Sciences, Vol. 14, No. 2, 2015, pp. 122-125

 en Effect of different torques in cyclic fatigue resistance of K3 rotary instruments
Kawakami, Dirce Akemi Sacaguti; Candeiro, George Táccio de Miranda; Akisue, Eduardo; Caldeira, Celso Luiz & Gavini, Giulio


Aim: To assess the effect of different torque values on cyclic fatigue resistance of K3 rotary nickeltitanium (NiTi) files. Methods: Eighty K3 files, size 25 mm, taper 0.04 were divided in 4 groups according to different torques (0.5, 1, 2 and 6 Ncm) and were submitted to a cyclic fatigue test. This test was performed with a device that allowed the file to rotate inside a stainless steel artificial curved canal, simulating the pecking motion. Files rotated until fracture occurred and time to failure was recorded in seconds with a stopwatch. Data were analyzed by ANOVA and Tukey tests (p<0.05). Results: All groups were compared and only the group of 6 showed statistically significant difference (p=0.0002). Conclusions: For #25.04 K3 files, the evaluated torques up to 2 had no influence on cyclic fatigue resistance. Using 6 torque value resulted in lower resistance to cyclic fatigue.

dental instruments; endodontics; fatigue; root canal preparation; torque

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