Table 9 Root and canal anatomy distribution in numbers and percentages based on age groups in mandibular premolars (n = 675).
Teeth | Age group | Variants | Total n (%) | p-value | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1TN1 n (%) | 1TN1–2−1 n (%) | 1TN1–2 n (%) | 1TN1–2−3 n (%) | 1TN1–2−3−2 n (%) | 2TN B1/L1 n (%) | 2TN 1B1/L1 n (%) | 2TN 1M1/D1–2−1 n (%) | 2TN M1/D1 n (%) | ||||
Mandibular first premolar | 10–20 | 8 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 (100) | 0.187 |
> 20–30 | 123 (93.90) | 6 (4.58) | 2 (1.52) | 0 | 0 | 0 | 0 | 0 | 0 | 131 (100) | ||
> 30–40 | 145 (87.88) | 16 (9.70) | 2 (1.20) | 0 | 0 | 0 | 2 (1.20) | 0 | 0 | 165 (100) | ||
> 40–50 | 32 (94.12) | 0 | 0 | 1 (2.94) | 0 | 1 (2.94) | 0 | 0 | 0 | 34 (100) | ||
> 50–60 | 13 (86.67) | 0 | 0 | 0 | 0 | 2 (13.33) | 0 | 0 | 0 | 15 (100) | ||
> 60–70 | 1 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100) | ||
Mandibular second premolar | 10–20 | 4 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 4 (100) | 0.093 |
> 20–30 | 124 (99.20) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (0.80) | 125 (100) | ||
> 30–40 | 137 (94.48) | 1 (0.68) | 2 (1.37) | 2 (1.37) | 0 | 2 (1.37) | 0 | 1 (0.68) | 0 | 145 (100) | ||
> 40–50 | 33 (86.85) | 3 (7.89) | 0 | 0 | 1 (2.63) | 1 (2.63) | 0 | 0 | 0 | 38 (100) | ||
> 50–60 | 4 (50.0) | 3 (37.50) | 0 | 1 (12.50) | 0 | 0 | 0 | 0 | 0 | 8 (100) | ||
> 60–70 | 1 (100) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100) | ||
