Winter, Pell and
Gregory classification 		Left Right P-valuea
N % N %
I-A vertical 4 5.71 4 5.71 0.32
I-A mesioangular 1 1.43 3 4.29 0.7
II-A vertical 6 8.57 1 1.43 0.69
II-A mesioangular 2 2.86 2 2.86 0.19
II-A distoangular 1 1.43 4 5.71 0.32
II-B vertical 1 1.43 3 4.29 0.19
II-B mesioangular 4 5.71 1 1.43 0.51
II-B horizontal 2 2.86 1 1.43 0.19
II-C mesioangular 1 1.43 4 5.71 0.72
III-A mesioangular 1 1.43 1 1.43 0.51
III-A horizontal 2 2.86 1 1.43 0.72
III-B vertical 1 1.43 1 1.43 0.72
III-B mesioangular 4 5.71 4 5.71 0.64
III-B horizontal 7 10 11 15.71 0.23
III-C mesioangular 4 5.71 3 4.29 0.51
III-C horizontal 6 8.57 8 11.43 0.41
Could not be classified 23 32.86 18 25.71 0.31
Total 70 100 70 100 -

aSignificant at level P ≤ 0.05 (Fisher's exact test).