Table 1 Distribution of the relationship between maxillary premolars root apices and the MSFs by age (%)
Age | MFPs | MSPs | ||||
|---|---|---|---|---|---|---|
Type OS | Type CO | Type IS | Type OS | Type CO | Type IS | |
18-40y | 85.2 | 10.8 | 4 | 52 | 32.3 | 15.7 |
41-60y | 95 | 5 | 0 | 71 | 25.8 | 3.2 |
>60y | 97.5 | 2.5 | 0 | 81.7 | 13.9 | 4.4 |