From: Prevalence of complex root canal morphology in the mandibular first and second premolars in Thai population: CBCT analysis
Tooth
Sample size (n)
Number of roots
1 root
n (%)
2 roots
3 roots
Mandibular 1st premolar
621
609 (98.1)
10 (1.6)
2 (0.3)
Mandibular 2nd premolar
538
537 (99.8)
1 (0.2)
–
Total
1159
1146 (98.9)
11 (0.9)
2 (0.2)