Table 1 Total bacterial load in root canal samples of teeth with asymptomatic apical periodontitis taken before (S1) and after instrumentation (S2) using ProTaper Next, ProTaper Gold and XP Endoshaper.

From: Comparison of antibacterial effectiveness of three rotary file system with different geometry in infected root canals before and after instrumentation–a double-blinded randomized controlled clinical trial

Instrumentation groups

Mean (copies/µl)

p value

Mean % S1 to S2 reduction

S1

S2

Fold Difference(S1/S2)

ProTaper Next

9.94 × 107

11.8 × 105

4.38 × 102

0.012

98.81

ProTaper Gold

20.4 × 107

87.2 × 105

0.80 × 102

95.72

XP Endoshaper

9.20 × 107

4.52 × 105

16.7 × 102

99.50

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