Abstract
Instrument fracture is one of major challenges during root canal treatment. In order to reduce such errors, it seems necessary to investigate the effects of potentially impactful factors. One of such factors could be the temperature of an agitator. This study examined the effects of different temperature of the sodium hypochlorite solution on the cyclic fatigue resistance of ProTaper Gold (PTG) rotary files. Forty-five PTG S1 rotary files were tested in a metal block that simulated a canal curvature angle of 60° and a curvature radius of 5 mm. They were randomly divided into 3 groups of 15 according to sodium hypochlorite temperatures of 22°C (group 1), 4°C (group 2) and 37°C (group 3). Files from each group were rotated at 300 rpm in the block at each temperature. The number of cycles to fracture was calculated and the fragment length was measured. The fractured surfaces were examined by means of scanning electron microscopy (SEM). The statistical analysis was completed using the Kolmogorov-Smirnov and Kruskal-Wallis tests, and the IBM SPSS Statistics for Windows software, v. 22.0, at a significance level of 5%. The cyclic fatigue resistance of the PTG rotary files was not significantly affected by the temperature of sodium hypochlorite (p > 0.05). Increasing the temperature of sodium hypochlorite to 37°C or decreasing it to 4°C did not significantly affect the cyclic fatigue resistance of PTG rotary files.
Highlights
One of the most important goals in root canal therapy is to reduce the microbial load in the root canal system to an acceptable level
This study examined the effects of different temperature of the sodium hypochlorite solution on the cyclic fatigue resistance of ProTaper Gold (PTG) rotary files
Research has shown that nickel-titanium (NiTi) rotary files result in fewer procedural errors during the preparation and shaping of root canals, and more favorable outcomes as compared to stainless-steel files.[1,2,3]
Summary
One of the most important goals in root canal therapy is to reduce the microbial load in the root canal system to an acceptable level. The fracture of rotary files within the root canal can have 2 forms – torsional fracture and cyclic fatigue fracture. Torsional fracture occurs when the file tip is engaged in the root canal and the file shank is in rotation, leading to the fracture of the file tip. Cyclic fatigue fracture occurs when the file undergoes repeated stress and tension, and fractures within the root canal. Cyclic fatigue is responsible for the majority of fractures. Instrument fracture is one of major challenges during root canal treatment. In order to reduce such errors, it seems necessary to investigate the effects of potentially impactful factors. One of such factors could be the temperature of an agitator
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call