From: CBCT evaluation of root canal morphology and anatomical relationship of root of maxillary second premolar to maxillary sinus in a western Chinese population
\(\overline{X }\pm S\)(mm)
Second premolar: single root
2.47 ± 3.45a
Second premolar: buccal root
1.49 ± 3.21b
Second premolar: palatal root
2.13 ± 3.13ab