From: Evaluation of root and canal morphology of mandibular premolar amongst Saudi subpopulation using the new system of classification: a CBCT study
Number of roots
Left 1st PM
Left 2nd PM
Right 1st PM
Right 2nd PM
Overall
n (%)
One root
299
283
298
287
1167 (94.87)
Two roots
24
3
1
52 (4.22)
Three roots
0
6 (0.48)
 C-shaped
2
5 (0.40)
Total
323
292
322
293
1230 (100)