TABLE 1.
Assessment of configuration of root canal morphology of mandibular premolars according to Vertucci 1984 classification
| Configuration of root canals | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tooth | Type I (1-1) | Type II (2-1) | Type III (1-2-1) | Type IV (2-2) | Type V (1-2) | Type VI (2-1-2) | Type VII (1-2-1-2) | Type VIII (3-3) | Others (different types) | C-shaped | Total | Chi-square (df) | P value |
| Left | |||||||||||||
| First premolar | 13 (10.7%) | 20 (16.5%) | 23 (19%) | 12 (9.9%) | 11 (9.1%) | 18 (14.9%) | 2 (1.7%) | (0%) | 22 (18.2%) | (0%) | 121 (100%) | 68.01(7) | 0.001 |
| Second premolar | 14 (12%) | 24 (20.5%) | 13 (11.1%) | 13 (11.1%) | 5 (4.3%) | 15 (12.8%) | 2 (1.7%) | (0%) | 30 (25.6%) | 1 (0.9%) | 117 (100%) | ||
| Right | |||||||||||||
| First premolar | 24 (19.4%) | 23 (18.5%) | 18 (14.5%) | 8 (6.5%) | 8 (6.5%) | 16 (12.9%) | 3 (2.4%) | (0%) | 24 (19.4%) | (0%) | 124 (100%) | 70.09(8) | 0.9994 |
| Second premolar | 16 (14%) | 22 (19.3%) | 13 (11.4%) | 7 (6.1%) | 4 (3.5%) | 19 (16.7%) | 2 (1.8%) | (0%) | 26 (22.8%) | 5 (4.4%) | 114 (100%) | ||
| Total number of teeth | 67 (14.1%) | 89 (18.7%) | 67 (14.1%) | 40 (8.4%) | 28 (5.9%) | 68 (14.3%) | 9 (1.9%) | (0%) | 102 (21.4%) | 6 (1.3%) | 476 (100%) | ||