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Table 4 The curvature of root canal on its dominantly curved side and gring. *p < 0.05, independent samples t test

From: CBCT evaluation of root canal morphology and anatomical relationship of root of maxillary second premolar to maxillary sinus in a western Chinese population

  Average curvature \(\left[ {\overline{X} \pm S\left(^\circ \right)} \right]\) Curvature degree [n, (%)]
Dominantly curved direction   Moderately curved (10–25°) Severely curved (> 25°)
Mesiodistal 18.06 ± 10.39 494 (78.4) 136 (21.6)
Buccopalatal 21.36 ± 8.62a 321 (71.7) 127 (28.3)
  1. aSignificant difference, p = 0.000000 < 0.05