Table 1. The EDX values of the elemental composition for pre-coated and post-coated files at the tip, cutting edge, and shaft of the files.

*A significant difference was identified among the elements of pre-coated and post-coated files.

EDX: Energy dispersive X-ray analysis

Element	Condition	C (mean ± SD)	O (mean ± SD)	Ti (mean ± SD)	Ni (mean ± SD)	p-value (Wilcoxon signed rank test)
Tip	Pre-coated	2.61±0.50	13.76±1.57	35.91±1.87	44.01±2.17	p=0.003*
	Post-coated	8.68±0.43	17.90±0.46	32.29±0.30	36.03±0.466	p=0.003*
Cutting edge	Pre-coated	2.74±0.28	14.45±0.35	35.78±0.60	42.17±0.69	p=0.003*
	Post-coated	27.59±0.50	18.33±0.33	26.35±1.20	26.36±1.20	p=0.003*
Shaft	Pre-coated	2.64±0.17	14.54±0.25	35.99±0.44	41.71±0.41	p=0.003*
	Post-coated	10.81±0.30	12.66±0.30	34.70±0.39	40.50±0.42	p=0.003*