Exploration of Medicine

Table 1

Mean dentin thickness in the mesial and distal canal walls in the two groups prior to instrumentation

Group		Mean (mm)	SD (mm)	T-test statistic	Df	P-value	Effect size (Cohen’s d)
Mesial wall, 3 mm	A1	0.9481	0.19373	–1.547	60	0.127	0.393
Mesial wall, 3 mm	C1 + A1	1.0277	0.21136	–1.547	60	0.127	0.393
Mesial wall, 5 mm	A1	1.0484	0.23752	0.300	60	0.766	–0.076
Mesial wall, 5 mm	C1 + A1	1.0326	0.17293	0.300	60	0.766	–0.076
Mesial wall, 7 mm	A1	1.1232	0.23624	–0.137	60	0.891	0.035
Mesial wall, 7 mm	C1 + A1	1.1310	0.20652	–0.137	60	0.891	0.035
Distal wall, 3 mm	A1	0.9097	0.19663	–0.982	60	0.330	0.249
Distal wall, 3 mm	C1 + A1	0.9619	0.22164	–0.982	60	0.330	0.249
Distal wall, 5 mm	A1	1.0081	0.22716	–0.041	60	0.968	0.010
Distal wall, 5 mm	C1 + A1	1.0103	0.20819	–0.041	60	0.968	0.010
Distal wall, 7 mm	A1	0.9997	0.19570	–0.781	60	0.438	0.198
Distal wall, 7 mm	C1 + A1	1.0400	0.21055	–0.781	60	0.438	0.198

SD: standard deviation; Df: degree of freedom