Manoj Manpreet, Mathew Leeba, Natarajan Srikant, Yellapurkar Shweta, Shetty Shravan, Denny Ceena, Dahal Samarika
Department of Oral Pathology & Microbiology, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Mangalore, Karnataka, India.
Center for Forensic Odontology, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Mangalore, Karnataka, India.
J Clin Imaging Sci. 2022 May 5;12:25. doi: 10.25259/JCIS_27_2022. eCollection 2022.
The shape of the condyle, coronoid, and the intervening sigmoid notch is unique due to attachments and direction of pull of temporalis muscle, different chewing habits, hormones, etc. So morphometric variation of these mandibular landmarks can be used in individual identification.
The study was carried out on 500 panoramic view images. Visual tracing assisted assessment of thousand sides (left and right) was done. Sexual dimorphism of left and right mandibular ramus parts (sigmoid notch bordered by coronoid and condylar process). The shape of coronoid process, condyle, and sigmoid notch were interpreted.
The most prevalent shape of sigmoid notch was wide variant (41.2%), condyle was convex type (50%) and coronoid was round (53.4%). Condyle and coronoid showed asymmetry between right and left with -value 0.001 and 0.019, respectively. This study has illustrated that triangular-shaped coronoid was more in females (-value 0.012).
Sexual dimorphism is observed in the shape of the mandible due to masticatory activity at the point of insertion of temporalis muscle, biting force, hormones, and various genetic reasons. The results have exemplified that the morphometric variation of condyle, coronoid and sigmoid notch can be used as a tool for personal identification.
由于颞肌的附着点和牵拉方向、不同的咀嚼习惯、激素等因素，髁突、冠突以及其间的乙状切迹的形态是独特的。因此，这些下颌骨标志点的形态测量变异可用于个体识别。
对500张全景图像进行研究。采用视觉追踪辅助评估两侧（左右）共1000个部位。对左右下颌支部分（由冠突和髁突界定的乙状切迹）进行性别差异分析。对冠突、髁突和乙状切迹的形态进行解读。
乙状切迹最常见的形态是宽型（41.2%），髁突是凸型（50%），冠突是圆形（53.4%）。髁突和冠突左右不对称，P值分别为0.001和0.019。本研究表明，三角形冠突在女性中更为常见（P值为0.012）。
由于颞肌附着点处的咀嚼活动、咬合力、激素以及各种遗传因素，下颌骨形态存在性别差异。结果表明，髁突、冠突和乙状切迹的形态测量变异可作为个体识别的工具。
