Department of Anatomy, Patan Academy of Health Sciences, Lalitpur, Nepal.
Department of dentistry, Patan Academy of Health Sciences, Lalitpur, Nepal.
J Nepal Health Res Counc. 2022 Jun 2;20(1):65-71. doi: 10.33314/jnhrc.v20i01.3822.
Mandible is the strongest and most dimorphic bone of skull which resists postmortem changes and plays an important role in sex determination. Skeletal characteristic differ in different population therefore need of population specific studies. The aim of present study was to determine sex by morphometric analysis of mandibular ramus.
A cross sectionalstudy was performed in orthopantomogram of patients collected from Dental Department of Patan Hospital, Lalitpur, Nepal. One hundred and fifty digital orthopantomogram of patient fulfilling inclusion criteria were included in the study. Five different mandibular parameters (maximum ramus breadth, minimum ramus breadth, condylar height/maximum ramus height, projective height of ramus, and coronoid height) were measured bilaterally resulting in total 300 rami being assessed. Orthopantomogram were made with Planmeca ProMax classic 2D machine and all the measurements on digital radiograph were performed with Planmeca Romexis viewer software version 5.1.0.R. Discriminant function analysis was performed to find the most significant predictors for determining sex.
All the measured mandibular parameters were statistically significantly higher in male than females (P<0.001). Condylar height was the most significant predictors for determining sex. The discriminate function equation was derived to determine sex with an overall accuracy of 84.0%.
Morphometric analysis of mandibular ramus using digital orthopantomogram showed a high sexual dimorphism.
下颌骨是颅骨中最强壮和最具二态性的骨骼，它能抵抗死后变化，在性别鉴定中起着重要作用。由于不同人群的骨骼特征存在差异，因此需要进行特定人群的研究。本研究旨在通过对下颌支的形态测量分析来确定性别。
这是一项在尼泊尔勒利德布尔帕坦医院牙科部门收集的患者全景片的横断面研究。本研究共纳入了 150 名符合纳入标准的患者的数字全景片。对双侧下颌支的 5 个不同下颌参数（最大支宽、最小支宽、髁突高度/最大支高度、支投影高度和喙突高度）进行了测量，总共评估了 300 个支。全景片由 Planmeca ProMax classic 2D 机拍摄，所有数字射线照片上的测量均使用 Planmeca Romexis viewer 软件版本 5.1.0.R 进行。进行判别函数分析以找到确定性别的最显著预测因子。
所有测量的下颌参数在男性中均显著高于女性（P<0.001）。髁突高度是确定性别的最显著预测因子。得出了一个判别函数方程来确定性别，其总体准确率为 84.0%。
使用数字全景片对下颌支进行形态测量分析显示出高度的性别二态性。
