The objective of this study is to establish the sex determination tool using canines in Thais. The samples
in this study were 266 Thai people, including 140 females and 126 males with age 20.05±1.47 years old. The
mesiodistal width of four canines and the upper and lower tip-to-tip intercanine width were measured. The differences
of all distances between sex were determined by the independent samples t-test with 0.05 significant level. Simple
and multiple logistic regression analyses were used to establish the sex determination equations for single and
multiple variables, respectively. Statistically significant differences between sex were found in all measurements.
Moreover, the sex determination equation with one variable for each measurement was statistically significant.
However, when all measurements were investigated together, only lower left canine and upper intercanine widthwere included in the sex determination equation with 25.1 % R2, and the odd ratio were 4.912 and 1.280 for lower
left canine and upper intercanine width, respectively. Moreover, the accuracy of novel equation is 68.18 %. In
conclusion, canine can be another tool to determine sex together with other factors.