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Root canals numbers of the maxillary first premolars in each age group
| Position of the root | One root canal | Two root canals | Three root canals | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| <30 yr | 30–50 yr | >50 yr | <30 yr | 30–50 yr | >50 yr | <30 yr | 30–50 yr | >50 yr | |||
| Cervical third (%) | 50.0 | 28.0 | 8.7 | 48.1 | 72.0 | 91.3 | 1.9 | 0.0 | 0.0 | ||
| Root center (%) | 51.9 | 26.0 | 17.4 | 44.2 | 74.0 | 82.6 | 3.8 | 0.0 | 0.0 | ||
| Apical third (%) | 61.5 | 58.0 | 39.1 | 34.6 | 42.0 | 60.9 | 3.8 | 0.0 | 0.0 | ||
Groups were divided into three: younger than 30 years, 30–50 years, and over 50 years.
