Table 1 The different anatomical features of Yemeni permanent maxillary first premolars
From: Root form and canal morphology of maxillary first premolars of a Yemeni population
Features | Single-rooted n (%) | Double-rooted n (%) | Three-rooted n (%) | Total n (%) |
|---|---|---|---|---|
Vertucci classification | ||||
Type I (1) | 33 (24.1%) | 0 (0.0%) | 0 (0.0%) | 33 (13.2%) |
Type II (2–1) | 11 (8.0%) | 0 (0.0%) | 0 (0.0%) | 11 (4.4%) |
Type III (1–2-1) | 20 (14.6%) | 0 (0.0%) | 0 (0.0%) | 20 (8.0%) |
Type IV (2) | 34 (24.8%) | 105 (94.6%) | 0 (0.0%) | 139 (55.6%) |
Type V (1–2) | 12 (8.8%) | 2 (1.8%) | 0 (0.0%) | 14 (5.6%) |
Type VI (2–1-2) | 4 (2.9%) | 0 (0.0%) | 0 (0.0%) | 4 (1.6%) |
Type VII (1–2–1-2) | 9 (6.6%) | 0 (0.0%) | 0 (0.0%) | 9 (3.6%) |
Type VIII (3) | 0 (0.0%) | 0 (0.0%) | 2 (100%) | 2 (0.8%) |
Gulabivala classification | ||||
Type I (3–1) | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
Type III (2–3) | 3 (2.2%) | 2 (1.8%) | 0 (0.0%) | 5 (2.0%) |
Type IV (2–1–2-1) | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
Additional types | ||||
Type (3–2-1) Sert & Bayirli | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
Type (2–3-2) Sert & Bayirli | 0 (0.0%) | 2 (1.8%) | 0 (0.0%) | 2 (0.8%) |
New types | ||||
Type (1–2-3) | 2 (1.5%) | 0 (0.0%) | 0 (0.0%) | 2 (0.8%) |
Type (1–2–1-2-1) | 2 (1.5%) | 0 (0.0%) | 0 (0.0%) | 2 (0.8%) |
Type (1–2–1-3-2) | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
Type (1–2–1-2-3-2) | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
Type (1–3-4) | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
Type (1–2–1-3-2) | 1 (0.7%) | 0 (0.0%) | 0 (0.0%) | 1 (0.4%) |
No. accessory canals | ||||
Accessory canals present | 65 (47.4%) | 66 (59.5%) | 1 (50%) | 132 (52.8%) |
Accessory canals absent | 72 (52.6%) | 45 (40.5%) | 1 (50%) | 118 (47.2%) |
Accessory canals in | ||||
Cervical third | 4 (5.4%) | 9 (11.7%) | 0 (0.0%) | 13 (8.5%) |
Middle third | 16 (21.6%) | 29 (37.7%) | 1 (50%) | 46 (30.1%) |
Apical third | 54 (73.0%) | 39 (50.6%) | 1 (50%) | 94 (61.4%) |
No. ICCs | ||||
ICCs present | 63 (46.0%) | 23 (20.7%) | 0 (0.0%) | 86 (34.4%) |
ICCs absent | 74 (54.0%) | 88 (79.3%) | 2 (100%) | 164 (65.6%) |
ICCs in | ||||
Cervical third | 30 (33.0%) | 13 (46.5%) | 0 (0.0%) | 43 (36.2%) |
Middle third | 39 (42.9%) | 9 (32.1%) | 0 (0.0%) | 48 (40.3%) |
Apical third | 22 (24.1%) | 6 (21.4%) | 0 (0.0%) | 28 (23.5%) |