| 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) |