Table 3 The frequency of root canal configuration according to age

Vertucci classification

 I

347 (64.7%)

440 (76.1%)

348 (64.9%)

432 (74.7%)

471 (87.9%)

501 (86.7%)

 II

3 (0.6%)

5 (0.9%)

3 (0.6%)

4 (0.7%)

14 (2.6%)

8 (1.4%)

 III

169 (31.5%)

131 (22.7%)

172 (32.1%)

138 (23.9%)

33 (6.2%)

44 (7.6%)

 IV

0 (0%)

0 (0%)

3 (0.6%)

0 (0%)

15 (2.8%)

19 (3.3%)

 V

3 (0.6%)

0 (0%)

2 (0.4%)

1 (0.2%)

2 (0.4%)

3 (0.5%)

 NC

14 (2.6%)

2 (0.3%)

8 (1.5%)

3 (0.5%)

1 (0.2%)

3 (0.5%)

 p-value

< 0.001¹

0.005¹

0.517¹

Ahmed classification

 ¹MI¹⁻¹

347 (64.7%)

440 (76.1%)

347 (64.7%)

432 (74.7%)

471 (87.9%)

501 (86.7%)

 ¹MI^1–2

3 (0.6%)

0 (0%)

2 (0.4%)

1 (0.2%)

1 (0.2%)

3 (0.5%)

 ¹MI^1–2−1

169 (31.5%)

131 (22.7%)

173 (32.3%)

138 (23.9%)

33 (6.2%)

44 (7.6%)

 ¹MI²⁻¹

3 (0.6%)

5 (0.9%)

3 (0.6%)

4 (0.7%)

14 (2.6%)

8 (1.4%)

 ¹MI^{2−1−2−1}

14 (2.6%)

2 (0.3%)

8 (1.5%)

3 (0.5%)

1 (0.2%)

3 (0.5%)

 ²MI

0 (0%)

0 (0%)

3 (0.6%)

0 (0%)

16 (3%)

19 (3.3%)

 p-value

< 0.001¹

0.004¹

0.439¹