Cutting efficiency of nickel-titanium endodontic instruments and the effect of sodium hypochlorite treatment

Effect of Electropolishing ProFile Nickel–Titanium Rotary Instruments on Cyclic Fatigue Resistance, Torsional Resistance, and Cutting Efficiency

“…There are several methods of measuring cutting efficiency (9,12,23,24). In this study, we chose to simulate a file's clinical use.…”

Rotary NiTi Instrument Fracture and its Consequences

“…However, it has been shown that NaOCl did not significantly reduce the torque at fracture or the number of revolutions to flexural fatigue of NiTi instruments (129) and was unlikely to cause pitting or crevice corrosion of NiTi instruments (130). Similarly, Haïkel et al (131) reported that mechanical properties of NiTi instruments were not affected by NaOCl, nor was the cutting efficiency (132). Nevertheless, at concentrations of 5 to 5.25%, NaOCl can lead to measurable corrosion (133).…”

Root Canal Irrigants

“…Submersing instruments for hours in a hypochlorite solution will induce corrosion (147). However, no adverse effects should be expected during the short contact periods when an instrument is manipulated in a root canal filled with hypochlorite (148).…”