Gupta Simran, Fernandes Rhea, Natarajan Srikant, Jose Nidhin P, Giri Jamal, Dahal Samarika
Intern, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India.
Department of Forensic Odontology, Manipal College of Dental Sciences, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, India.
J Oral Maxillofac Pathol. 2024 Jan-Mar;28(1):111-118. doi: 10.4103/jomfp.jomfp_280_23. Epub 2024 Apr 15.
The study aims to identify sexual dimorphic features in the arch patterns based on tooth arrangement patterns and the maxillary and mandibular arches using Euclidean Distance Matrix Analysis (EDMA).
A total of 96 Nepalese subjects, aged 18 to 25 were assessed using casts and photographs.
Thirteen landmarks representing the most facial portions of the proximal contact areas on the maxillary and mandibular casts were digitised. Seventy-eight possible, Euclidean distances between the 13 landmarks were calculated using the Analysis ToolPak of Microsoft Excel®. The male-to-female ratios of the corresponding distances were computed and ratios were compared to evaluate the arch form for variation in the genders, among the Nepalese population.
Microsoft Excel Analysis ToolPak and SPSS 20.0 (IBM Chicago) were used to perform EDMA and an independent -test to compare the significant differences between the two genders.
The maxillary arch's largest ratio (1.008179001) was discovered near the location of the right and left lateral incisors, indicating that the anterior region may have experienced the greatest change. The posterior-molar region is where the smallest ratio was discovered, suggesting less variation. At the intercanine region, female arches were wider than male ones; however, at the interpremolar and intermolar sections, they were similar in width. Females' maxillary arches were discovered to be bigger antero-posteriorly than those of males. The highest ratio (1.014336113) in the mandibular arch was discovered at the intermolar area, suggesting that males had a larger mandibular posterior arch morphology. At the intercanine area, the breadth of the arch form was greater in males and nearly the same in females at the interpremolar and intermolar regions. Female mandibular arch forms were also discovered to be longer than those of males from the anterior to the posterior.
The male and female arches in the Nepalese population were inferred to be different in size and shape. With references to the landmarks demonstrating such a shift, the EDMA established objectively the presence of square arch forms in Nepali males and tapering arch forms in Nepalese females.
本研究旨在利用欧几里得距离矩阵分析（EDMA），根据牙齿排列模式以及上颌和下颌牙弓，确定牙弓形态中的性别二态性特征。
使用石膏模型和照片对96名年龄在18至25岁的尼泊尔受试者进行评估。
对上颌和下颌石膏模型上代表近端接触区域最面部部分的13个地标点进行数字化处理。使用Microsoft Excel®的分析工具包计算这13个地标点之间78种可能的欧几里得距离。计算相应距离的男女比例，并比较这些比例以评估尼泊尔人群中不同性别的牙弓形态差异。
使用Microsoft Excel分析工具包和SPSS 20.0（IBM芝加哥）进行EDMA分析，并进行独立t检验以比较两性之间的显著差异。
在上颌牙弓中，最大比例（1.008179001）出现在左右侧切牙附近，表明前部区域可能经历了最大的变化。最小比例出现在后磨牙区域，表明变化较小。在尖牙间区域，女性牙弓比男性宽；然而，在双尖牙间和磨牙间区域，它们的宽度相似。发现女性上颌牙弓在前后方向上比男性的更大。在下颌牙弓中，最大比例（1.014336113）出现在磨牙间区域，表明男性下颌后牙弓形态更大。在尖牙间区域，男性牙弓形态的宽度更大，在双尖牙间和磨牙间区域女性的宽度几乎相同。还发现女性下颌牙弓形态从前往后也比男性的更长。
推断尼泊尔人群中的男性和女性牙弓在大小和形状上存在差异。参照显示这种变化的地标点，EDMA客观地确定了尼泊尔男性存在方形牙弓形态，尼泊尔女性存在逐渐变细的牙弓形态。
