Exploration of Medicine

Table 2

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

Group		Mean (mm)	SD (mm)	T-test statistic	Df	P-value	Effect size (Cohen’s d)
Mesial wall, 3 mm	A1	0.8042	0.20879	–1.630	60	0.108	0.414
Mesial wall, 3 mm	C1 + A1	0.8955	0.23167	–1.630	60	0.108	0.414
Mesial wall, 5 mm	A1	0.8684	0.22259	0.050	60	0.960	–0.013
Mesial wall, 5 mm	C1 + A1	0.8658	0.17780	0.050	60	0.960	–0.013
Mesial wall, 7 mm	A1	0.9194	0.21409	–0.142	60	0.888	0.036
Mesial wall, 7 mm	C1 + A1	0.9265	0.17779	–0.142	60	0.888	0.036
Distal wall, 3 mm	A1	0.7987	0.16134	–0.428	60	0.670	0.109
Distal wall, 3 mm	C1 + A1	0.8187	0.20394	–0.428	60	0.670	0.109
Distal wall, 5 mm	A1	0.8726	0.19676	0.636	60	0.527	–0.162
Distal wall, 5 mm	C1 + A1	0.8403	0.20284	0.636	60	0.527	–0.162
Distal wall, 7 mm	A1	0.7816	0.18657	–0.951	60	0.345	0.242
Distal wall, 7 mm	C1 + A1	0.8281	0.19774	–0.951	60	0.345	0.242

SD: standard deviation; Df: degree of freedom