The Impact of Multiple Autoclave Cycles on the Surface Roughness of Thermally Treated Nickel-Titanium Endodontic Files

Table 1

Mean and standard deviations of SR parameters before and after different autoclaving cycles.

SR parameters		TN	PTG	ETP
NiTi	Cycle	Mean ± SD	Mean ± SD	Mean ± SD
Ra	0	17.00 ± 4.70^a	16.52 ± 2.84^a	15.99 ± 5.14^a
	1	9.68 ± 1.80^b	8.33 ± 1.66^b	8.16 ± 0.88^b
	5	11.36 ± 2.80^b	8.80 ± 1.65^b	11.66 ± 1.47^a,b
	10	12.92 ± 1.12^a,b	8.23 ± 0.83^b	10.19 ± 1.54^b
value		0.008	0.0001	0.004
Rq	0	22.51 ± 6.057^a	22.46 ± 4.13^a	21.04 ± 6.50^a
	1	13.13 ± 2.28^b	11.44 ± 2.25^b	11.28 ± 1.05^b
	5	15.62 ± 3.53^b	11.96 ± 2.15^b	16.21 ± 2.05^a,b
	10	17.84 ± 1.38^a,b	11.51 ± 1.04^b	13.81 ± 1.85^b
value		0.008	0.0001	0.003
Rz	0	51.84 ± 21.20^a	64.85 ± 12.34^a	63.88 ± 19.32^a
	1	39.81 ± 8.54^b	35.70 ± 12.00^b	43.89 ± 8.85^b
	5	45.28 ± 9.80^a,b	35.99 ± 6.95^b	82.08 ± 22.22^a,c
	10	68.26 ± 7.25^a,c	38.60 ± 7.38^b	55.69 ± 3.05^a,b
value		0.009	0.004	0.003

a, b, and c indicate cycles with the same letters have no significant differences. indicates statistically significant difference ≤0.05.