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Table 2 Measurement results of the initial and post-instrumentation volume and surface areas of the MM canals (n = 6 per group)

From: Micro-computed tomographic evaluation of the shaping ability of three nickel-titanium rotary systems in the middle mesial canal of mandibular first molars: an ex vivo study based on 3D printed tooth replicas

NiTi

System

Initial

Volume (mm3)

Post-instrumentation

Volume

(mm3)

Volume

increase

(%)

Initial

Surface

(mm2)

Post-instrumentation

Surface

(mm2)

Surface

increased

(%)

OS

1.12 ± 0.10

2.32 ± 0.31b

107.9 ± 18.9b

11.51 ± 0.75

16.29 ± 0.79b

42.0 ± 10.1ab

TF

1.10 ± 0.14

2.07 ± 0.17c

89.1 ± 21.3b

11.89 ± 1.11

15.66 ± 0.87b

32.3 ± 10.9b

PTG

1.14 ± 0.08

2.71 ± 0.11a

138.5 ± 20.7a

12.03 ± 0.45

17.78 ± 0.42a

48.0 ± 6.3a

F value

0.180

23.090

9.050

0.658

13.72

4.342

P value

0.837

0.000

0.003

0.532

0.000

0.033

  1. Values with the different lowercase superscript letters along the same column are significantly different (p < 0.05). (OS—OneShape; TF—Twisted Files; PTG—ProTaper Gold)