Effect of different torques in cyclic fatigue resistance of K3 rotary instruments
AUTOR(ES)
Kawakami, Dirce Akemi Sacaguti, Candeiro, George Táccio de Miranda, Akisue, Eduardo, Caldeira, Celso Luiz, Gavini, Giulio
FONTE
Braz. J. Oral Sci.
DATA DE PUBLICAÇÃO
2015-06
RESUMO
To assess the effect of different torque values on cyclic fatigue resistance of K3 rotary nickel-titanium (NiTi) files. 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). All groups were compared and only the group of 6 N.cm showed statistically significant difference (p=0.0002). For #25.04 K3 files, the evaluated torques up to 2 N.cm had no influence on cyclic fatigue resistance. Using 6 N.cm torque value resulted in lower resistance to cyclic fatigue.
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