1 root

2 roots

3 roots

Direction of curvature

-

B

P

MB

DB

P

Straight

18.6

19.9

21.1

11.8

16.5

41

Toward Palatal

1

26.8

2.3

0.5

3.2

56.9

Toward Buccal

1.2

2.3

24.9

-

0.6

-

Toward Mesial

0.5

0.7

1

41.8

48.8

-

Toward Distal

73.9

38.3

41.9

27.4

29.3

2.1

“S”curve

4.8

12

8.8

18.5

1.6

-

Total

100

100

100

100

100

100