From: Cone-beam computed tomography study of root and canal morphology of mandibular premolars in a western Chinese population
Root canal configurations
Type I 1
Type II 2-1
Type III 1-2-1;
Type IV 2
Type V 1-2
Type VI 2-1-2
Type VII 1-2-1-2
Type VIII 1-3
C-shaped
Number
151
0
3
17
1
2
Percentage
86.8
1.7
9.8
0.6
1.1