SPSS 21.0 was used for statistical analysis. The diameter of specific sites and breaking length were described as mean±SD. Kolmogorov-Smimov test showed that the data were normally distributed, and the homogeneity of variance test was performed. The paired t test of diameters of instruments before and after the breaking of specific sites was performed, and the variance of breaking length of nickel-titanium instruments under five different irrigation conditions was analyzed. P < .05 was considered statistically significant.

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