Table 4 Frequency of occurrence of middle mesial (MM) canals in mandibular first molars in three age groups
Age groups | |||
|---|---|---|---|
A (< 30 years) | B (30–50 years) | C (> 50 years) | |
Teeth with MM, n (%) | 10 (4.1%) | 6 (1.4%) | 1 (0.4%) |
Teeth without MM, n (%) | 231 (95.9%) | 425 (98.6%) | 226 (99.6%) |
Total | 241 | 431 | 227 |