Code

Root length (mm)

nPLI

rPLI

Maxilla

Central incisor

U-CI

12.2

2.6

2.6 × (97.4 − 8.52X)/100

Lateral incisor

U-LI

13.4

2.6

2.6 × (97.7 − 8.73X)/100

Canine

U-C

16.6

3.8

3.8 × (99.4 − 7.09X)/100

First premolar

U-PM1

12.9

3.2

3.2 × (98.2 − 8.53X)/100

Second premolar

U-PM2

13.9

3.0

3.0 × (96.6 − 8.67X)/100

First molar

U-M1

13.5

6.0

6.0 × (102.4 − 8.28X)/100

Second molar

U-M2

12.7

4.8

4.8 × (99.8 − 8.49X)/100

Mandible

Central incisor

L-CI

12.0

2.1

2.1 × (98.2 − 8.00X)/100

Lateral incisor

L-LI

12.6

2.3

2.3 × (98.9 − 8.90X)/100

Canine

L-C

14.9

3.4

3.4 × (98.7 − 7.67X)/100

First premolar

L-PM1

14.7

3.1

3.1 × (97.2 − 8.16X)/100

Second premolar

L-PM2

14.0

2.7

2.7 × (96.5 − 8.56X)/100

First molar

L-M1

12.6

5.6

5.6 × (100.7 − 7.99X)/100

Second molar

L-M2

12.6

4.8

4.8 × (98.9 − 8.42X)/100