A geometric morphometric study on sexual dimorphism in mandible
10.13618/j.issn.1001-5728.2023.06.015
- VernacularTitle:三维几何形态学在下颌骨性别推断中的应用
- Author:
Lu WANG
1
;
Xin ZHONG
;
Li SU
;
Wengen XU
;
Shuang LIU
;
Xiang XU
Author Information
1. 皖南医学院法医学院,安徽 芜湖 241002
- Keywords:
Forensic anthropology;
Sex determination;
Geometric morphometric;
Mandible
- From:
Chinese Journal of Forensic Medicine
2023;38(6):683-686
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the sexual dimorphism in the size and shape of the mandible using geometric morphometric techniques which are based on marker points,to provide a further exploration of morphological characteristics of the mandible,new ideas and theoretical foundation to support sex difference.Methods The craniofacial thin-layer CT images of 164 northern Han Chinese adults(80 males and 84 females)were used in the study,and three-dimensional coordinates of 18 landmarks were acquired.Sex differences in mandibular size and shape were assessed using the generalized procrustes superimposition,principal component analysis,and regression analysis.Results Allometric analysis showed a statistically significant effect of mandible size on shape(P<0.001),the significance of the sex differences were found in size and shape,with male mandibles larger than female mandibles,PCA plots showed considerable overlap of the male and female mandible along the extracted PCs,and logistic regression showed that the overall sex inference accuracy was 67.1%to 89.6%.Conclusion Male and female mandibles differ more in size than in shape,and when shape and size information are combined in the analysis,the accuracy of sex classification is improved to a greater extent.
