Cyclic Fatigue Resistance of Blue Heat-Treated Instruments at Different Temperatures

Table 1

Mean and standard deviation of the number of cycles to fracture (NCF) according to instrument type and temperature used.

Instrument type	20°C mean ± SD (CV%)	37°C mean ± SD (CV%)	value
VB	1.899 ± 629.73^(A)	1.033 ± 190.07^(A)
XB	2.974 ± 449.12^(B)	1.082 ± 374.19^(A)
RB	5.419 ± 1,179.85^(C)	2.019 ± 388.49^(B)
value	P^(3) = 0.004	P^(4) < 0.001

Significant difference at 0.05. ⁽¹⁾Student’s t-test with equal variances. ⁽²⁾Student’s t-test with unequal variances. ⁽³⁾F (analysis of variance (ANOVA)) test with Tukey’s comparisons. ⁽⁴⁾F (ANOVA) test with Tamhane comparisons. Different superscript letters in the same column mean significant difference ().