From: Root and canal morphology of mandibular second molars in an Egyptian subpopulation: a cone-beam computed tomography study
Males
Females
Total
χ2
p-value
One
n(%)
8(2.2%)
3(0.9%)
11(3.1%)
33.33
< 0.001*
Two
38(10.9%)
18(5.1%)
56(16%)
Three
87(24.9%)
193(55.1%)
280(80%)
Four
2(66.7%)
1(33.3%)
135(38.6%)
215(61.4%)
350(100.0%)