Table 3.
Measurements of the upper right premolars
| n | % | Minimum | Maximum | X | SD | M | ||
|---|---|---|---|---|---|---|---|---|
| Presence of concavity | No | 0 | 0 | |||||
| Yes | 100 | 100 | ||||||
| Origin of the concavity | Cervical third of the crown | 37 | 37 | |||||
| Cervical third of the root | 60 | 60 | ||||||
| Middle third of the root | 2 | 2 | ||||||
| Apical third of the root | 0 | 0 | ||||||
| Middle third of the crown | 1 | 1 | ||||||
| Depth of the concavity (mm) | 0.2 | 2.09 | 0.99 | 0.36 | 1 | |||
| Buccolingual length (mm) | 1.81 | 6.25 | 4.27 | 0.88 | 4.22 | |||
| Distance from CEJ on the crown (mm) | 0 | 3.4 | 0.52 | 0.75 | 0 | |||
| Distance from CEJ on the root (mm) | 1.22 | 12.46 | 7.16 | 2.11 | 7 | |||
| Apicocoronal length (mm) | 1.22 | 12.46 | 7.68 | 2.27 | 7.51 | |||
| Amount of bone loss (BL) (CBCT) | 0 | 48 | 48 | |||||
| < 25% | 22 | 22 | ||||||
| 25–50% | 21 | 21 | ||||||
| > 50% | 9 | 9 | ||||||
| Amount of bone loss (BL) (Panoramic radiograph) | 0 | 50 | 50 | |||||
| < 25% | 23 | 23 | ||||||
| 25–50% | 19 | 19 | ||||||
| > 50% | 8 | 8 | ||||||
| Location of furcation | 0 | 41 | 41 | |||||
| Cervical Third | 1 | 1 | ||||||
| Middle Third | 20 | 20 | ||||||
| Apical Third | 38 | 38 | ||||||
| Number of roots | Single Root | 41 | 41 | |||||
| Double Root | 59 | 59 | ||||||
| Buccal root length (mm) | 7.22 | 17.6 | 13.31 | 1.73 | 13.62 | |||
| Palatinal root length (mm) | 7.77 | 15.42 | 12.33 | 1.63 | 12.6 | |||
| Buccopalatinally cervical root width (mm) | 6.2 | 9.8 | 8.17 | 0.77 | 8.24 | |||
n, number; SD, standard deviation; M, median