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
173
1
0
3
Percentage
97.2
0.55
1.7