From: Less extrusion debris during the retreatment of curved canals using twisted files with higher rotational speeds: an ex vivo study
Group
Number
Mean Weight (mg)
SD
Range
A
12
0.54
0.05
0.45–0.61
B
0.48
0.04
0.42–0.56
C
0.42
0.03
0.38–0.49
D
0.69
0.62–0.76