Table 3 . P-values obtained by two by two comparisons of different studied groups regarding the diameter of dentinal tubules .

	G1	G2	G3	G4	G5
G1	‏-	<0.001	0.012	<0.001	<0.001
G2	<0.001	‏-	<0.001	<0.001	0.254
G3	0.012	<0.001	‏-	<0.001	<0.001
G4	<0.001	<0.001	<0.001	‏-	<0.001
G5	<0.001	0.254	<0.001	<0.001	‏-