Sex determination from the mandibular ramus flexure of Koreans by discrimination function analysis using three-dimensional mandible models.
It has been known that mandible ramus flexure is an important morphologic trait for sex determination. However, it will be unavailable when mandible is incomplete or fragmented. Therefore, the anthropometric analysis on incomplete or fragmented mandible becomes more important. The aim of this study is to investigate the sex-discriminant potential of mandible ramus flexure on the Korean three-dimensional (3D) mandible models with anthropometric analysis. The sample consists of 240 three dimensional mandibular models obtained from Korean population (M:F; 120:120, mean age 46.2 y), collected by The Catholic Institute for Applied Anatomy, The Catholic University of Korea. Anthropometric information about 11 metric was taken with Mimics, anthropometry libraries toolkit. These parameters were subjected to different discriminant function analyses using SPSS 17.0. Univariate analyses showed that the resubstitution accuracies for sex determination range from 50.4 to 77.1%. Mandibular flexure upper border (MFUB), maximum ramus vertical height (MRVH), and upper ramus vertical height (URVH) expressed the greatest dimorphism, 72.1 to 77.1%. Bivariate analyses indicated that the combination of MFUB and MRVH hold even higher resubstitution accuracy of 81.7%. Furthermore, the direct and stepwise discriminant analyses with the variables on the upper ramus above flexure could predict sex in 83.3 and 85.0%, respectively. When all variables of mandibular ramus flexure were input in stepwise discriminant analysis, the resubstitution accuracy arrived as high as 88.8%. Therefore, we concluded that the upper ramus above flexure hold the larger potentials than the mandibular ramus flexure itself to predict sexes, and that the equations in bivariate and multivariate analysis from our study will be helpful for sex determination on Korean population in forensic science and law.
Department of Nuclear Medicine, First Hospital of Jilin University, 71#, Xinmin Street, Changchun 130021, PR China. Electronic address: linchh1967@yahoo.com.cn.
Chenghe
C
Lin
Department of Nuclear Medicine, First Hospital of Jilin University, 71#, Xinmin Street, Changchun 130021, PR China. Electronic address: jiaobenzheng@yahoo.com.cn.
Benzheng
B
Jiao
Department of Hematology and Oncology, First Hospital of Jilin University, 71#, Xinmin Street, Changchun 130021, PR China. Electronic address: liuss8888@yahoo.com.cn.
Shanshan
S
Liu
Department of Nuclear Medicine, First Hospital of Jilin University, 71#, Xinmin Street, Changchun 130021, PR China. Electronic address: ad4696@sina.com.
Feng
F
Guan
Division of Forensic Medicine, National Forensic Service, 139 Jiyangro, Yancheon-Gu, Seoul 158707, Republic of Korea. Electronic address: nechung@korea.kr.
Nak-Eun
NE
Chung
Department of Anatomy, School of Medicine, Chungang University, 84 Heukseouk-Ro, Dongjak-Gu, Seoul 156861, Republic of Korea. Electronic address: hsh@catholic.ac.kr.
Seung-Ho
SH
Han
Catholic Institute for Applied Anatomy, Department of Anatomy, College of Medicine, The Catholic University of Korea, 222 Banpo-Daero, Seocho-Gu, Seoul 137-701, Republic of Korea. Electronic address: cicloaum@catholic.ac.kr.
U-Young
UY
Lee
D044466:Asian People; D003198:Computer Simulation; D016002:Discriminant Analysis; D005260:Female; D018732:Forensic Anthropology; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008334:Mandible / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008875:Middle Aged; D056910:Republic of Korea; D054881:Sex Determination by Skeleton / Q000379:methods*
Discrimination function analysis; Korean; Mandibular ramus flexure; Sex determination; Three-dimensional model