Table 4. Type and number of C-shaped root canal in maxillary first and second molars.
| Type of C-shaped root canal | Total (n = 3,553) | Maxillary first molar (n = 1,786) |
Maxillary second molar (n = 1,767) |
||
|---|---|---|---|---|---|
| Type I Fusion of 2 roots |
Subtype A: MB-P | 57 (1.6) | 11 (0.3) | 0 (0.0) | 11 (0.6) |
| Subtype B: DB-P | 2 (0.06) | 0 (0.0) | 2 (0.1) | ||
| Subtype C: MB-DB | 44 (1.2) | 15 (0.8) | 29 (1.6) | ||
| Type II Fusion of 3 roots |
Subtype A: DB-MB-P | 5 (0.14) | 3 (0.08) | 0 (0.0) | 3 (0.2) |
| Subtype B: MB-P-DB (V shape) | 2 (0.06) | 0 (0.0) | 2 (0.1) | ||
| Type III Other type of root canal fusion |
MP-DP (teeth with 4 root canals) | 1 (0.03) | 0 (0.0) | 1 (0.1) | |
| Total | 63 (1.8) | 15 (0.8)* | 48 (2.7)* | ||
' - 'means fusion of root canals that make C-shape.
Values within parentheses are percentages of the total number of teeth in each column.
MB, mesiobuccal root canal; DB, distobuccal root canal; P, palatal root canal; MP, mesiopalatal root canal; DP, distopalatal root canal.
*The difference between maxillary first molar and second molar was statistically significant (p < 0.05).