Table 2. The Inter-group Comparison of Mean Smear Layer Removal at Middle Third.

		Middle
		Mean Difference	P Value a
Control Group	Manual Agitation	0.43	0.038*
Control Group	EndoActivator	1.03	0.001*
Control Group	X-Pulse tip	1.63	< 0.001*
Manual Agitation	EndoActivator	0.60	0.032*
Manual Agitation	X-Pulse tip	1.20	0.001*
EndoActivator	X-Pulse tip	0.60	0.042*

^a Mann-Whitney U test; * Significant difference.