Sex Determination of Maxillary Arch Based on the Three-dimensional Reconstructed Models
Sex determination by measuring bones is an important part of forensic anthropology,and a database of bones from one population at one time is often not applicable to another.Teeth and jaws are more stable than other bones and tend to be preserved more intact.With the continuous improvement of medical imaging technology,the use of computer to measure and analyze three-dimensional skeletal images has become a trend of forensic anthropology research.Therefore,for individuals in central China,this study aims to establish a mathematical model for sex determination by using multiple measurement indexes of maxillary arch and evaluate its effect.Firstly,21 indexes of 180 cases(83 males and 97 females)from central China were measured based on the cone beam CT samples of the maxillary arch.Then,the statistical software SPSS 20.0 was used to screen out indexes with gender differences.Finally,we analyzed the measured indexes with gender differences by single variable and multivariable discriminate analysis,and the mathematical model was obtained and the accuracy of the sex determination was calculated.The results showed that there were 10 indexes with statistical difference between male and female(P<0.05)among the 21 indexes,and the average value of male was greater than that of female.Univariate discriminant analysis was carried out on these 10 indexes,10 discriminant formulas were established,and the accuracy rate was 57.2%-72.2%after cross-verification.Through cross validation,the accuracy of the upper dental arch width was the highest,up to 72.2%.The multivariable discriminant analysis showed that the accuracy rate of the discriminant formula obtained by direct method was 73.4%after cross-verification,and the accuracy rate of cross verification was 72.2%after the variables were selected by stepwise method,and the two variables of upper alveolar arch length and upper alveolar arch width were included in the discriminant analysis.The accuracy of direct method was higher than that of stepwise method.The study showed that the upper jaw arch measurement indexes in this study have a certain value for sex determination.In the next research,we will also explore the application value of more skull bone markers in various aspects of forensic anthropology.
万方数据
维普
