Table 1 Types of morphological change in C-shape canal configuration along the root length.

From: The C-shaped root canal systems in mandibular second molars in an Emirati population

Types of morphological change

Root thirds

Total percentage

Coronal

Middle

Apical

Type 1 (T1)

C1

C2

C3d

18%

Type 2 (T2)

C1

C3c

C3d

15.4%

Type 3 (T3)

C4

C3c

C3d

7.7%

Type 4 (T4)

C3c

C3c

C3d

7.7%