Table 2 The minimal distal dentine thicknesses of ML 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 | 0.98 ± 0.14 | 0.82 ± 0.13 | 0.79 ± 0.12 | 0.79 ± 0.13 | 0.80 ± 0.10 | 0.98 ± 0.16 | 0.80 ± 0.12 | 0.77 ± 0.12 | 0.77 ± 0.13 | 0.78 ± 0.13 |
31–50 y | 1.00 ± 0.17 | 0.84 ± 0.15 | 0.79 ± 0.13 | 0.79 ± 0.12 | 0.80 ± 0.13 | 0.99 ± 0.17 | 0.82 ± 0.14 | 0.80 ± 0.13 | 0.79 ± 0.12 | 0.80 ± 0.13 |
51–60 y | 1.02 ± 0.17 | 0.86 ± 0.15 | 0.82 ± 0.14 | 0.82 ± 0.13 | 0.83 ± 0.12 | 1.02 ± 0.17 | 0.84 ± 0.14 | 0.81 ± 0.13 | 0.82 ± 0.14 | 0.82 ± 0.13 |
Total | 1.01 ± 0.17 | 0.84 ± 0.15 | 0.80 ± 0.13 | 0.80 ± 0.13 | 0.81 ± 0.12 | 0.99 ± 0.17 | 0.82 ± 0.13 | 0.79 ± 0.13 | 0.79 ± 0.13 | 0.80 ± 0.13 |