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Table 1 The minimal distal dentine thicknesses of MB canals in danger zone (mean ± SD, mm)

From: Root dentine thickness of danger zone in mesial roots of mandibular first molars

Groups

Men

Women

1 mm

2 mm

3 mm

4 mm

5 mm

1 mm

2 mm

3 mm

4 mm

5 mm

18–30 y

0.95 ± 0.15

0.80 ± 0.14

0.78 ± 0.13

0.80 ± 0.14

0.78 ± 0.14

0.89 ± 0.14

0.76 ± 0.14

0.74 ± 0.13

0.76 ± 0.14

0.76 ± 0.15

31–50 y

0.96 ± 0.17

0.82 ± 0.15

0.80 ± 0.14

0.79 ± 0.14

0.81 ± 0.13

0.93 ± 0.16

0.79 ± 0.14

0.79 ± 0.13

0.80 ± 0.14

0.80 ± 0.14

≥51 y

1.01 ± 0.18

0.85 ± 0.15

0.82 ± 0.15

0.83 ± 0.15

0.83 ± 0.15

0.97 ± 0.16

0.84 ± 0.14

0.81 ± 0.14

0.81 ± 0.15

0.82 ± 0.14

Total

0.98 ± 0.17

0.83 ± 0.15

0.80 ± 0.14

0.81 ± 0.14

0.81 ± 0.14

0.93 ± 0.16

0.79 ± 0.14

0.78 ± 0.14

0.79 ± 0.14

0.79 ± 0.13