Influence of an Innovative Anti-Corrosive Solution on Resistance of Endodontic NiTi Rotary Instruments: A Preliminary Study

Abstract

Objective: To evaluate the effects of deionised water, blood, phosphate-buffered saline (PBS) and a new an- ti-corrosive solution based on methoxy propyl amine (MOPA) on the cyclic fatigue resistance of endodontic NiTi rotary instruments under in vitro conditions.Methods: Forty ProTaper F1 files were provided and divided to four groups (n=10). Samples were first auto-claved and then stored in deionised water, blood, PBS or MOPA for 24 hours. Cyclic fatigue was tested witha custom-made stainless-steel block including artificial canals (curvature angle=30 degree, radius of curva- ture=5 mm). After immersion in test solutions, samples were rotated 300 rpm until fracture occurred. The number of cycles to failure (NCF) was calculated using recorded fracture time.Results: Data were analysed by the Kolmogorov–Smirnov, Levene, ANOVA and Scheffe statistical tests. Samplesin blood group showed the lowest and samples in MOPA group showed the highest NCF values. Significant differ- ence was observed between groups (p=0.001). NCF value of PBS group was significantly more than the NCF values of samples in blood and deionised water groups (p