Table 2.

p-values of paired t-test for depth (non-significant values are shown in bold).

	25 mm	30 mm	35 mm	40 mm
20 mm	0.3861	<0.01	<0.01	<0.01
25 mm		<0.01	<0.01	<0.01
30 mm			<0.01	0.0577
35 mm				0.8292