Table 4: Vickers hardness (VH) of materials at different depths and postirradiation times (mean and SD in parentheses).

MaterialDepth 10 min1 day7 days

FL0 mm34.7 (3.3) a29.6 (4.0) a31.8 (4.4) a
1 mm32.5 (4.5) a30.4 (3.2) a29.6 (3.4) a
2 mm30.4 (3.6) a31.1 (5.4) a33.4 (2.9) a
4 mm22.0 (1.8) b31.5 (3.1) a34.8 (3.3) a

FF0 mm35.9 (4.2) a29.7 (3.3) b27.1 (3.6) b
1 mm37.5 (6.5) a26.5 (4.8) b26.9 (3.8) b
2 mm35.6 (2.7) a25.8 (4.3) b26.3 (2.6) b
4 mm31.0 (3.8) b28.9 (3.5) b29.7 (4.5) b

VT0 mm16.0 (3.3) a16.2 (1.6) a20.4 (3.7) b
1 mm17.9 (2.7) ab17.9 (3.0) ab19.8 (1.6) b
2 mm15.2 (2.1) a16.4 (2.7) a20.6 (2.6) b
4 mm5.3 (1.3) c14.7 (3.2) a15.8 (1.9) a

Within the same material, means with same lowercase letters indicate no statistically significant difference between the groups ( > 0.05).