Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images
Introduction: Assessment of the human mandible has been a component of biological identification in forensic anthropological practice. We employed the digital geometric morphometric analysis, a statistical analysis using Cartesian landmark coordinates for this assessment. In this report, the propose...
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| Format: | Article |
| Language: | English |
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Faculty of Medicine and Health Sciences, Universiti Putra Malaysia
2024
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| Online Access: | http://psasir.upm.edu.my/id/eprint/120251/ http://psasir.upm.edu.my/id/eprint/120251/1/120251.pdf |
| _version_ | 1848868147472367616 |
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| author | Tan, Lii Jye Chai, Tong-Yuen Koh, Cai Ping Shafee, Mohamed Swarhib Hiu, Jessie Lai, Shau-Kong Mohd Nor, Faridah |
| author_facet | Tan, Lii Jye Chai, Tong-Yuen Koh, Cai Ping Shafee, Mohamed Swarhib Hiu, Jessie Lai, Shau-Kong Mohd Nor, Faridah |
| author_sort | Tan, Lii Jye |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | Introduction: Assessment of the human mandible has been a component of biological identification in forensic anthropological practice. We employed the digital geometric morphometric analysis, a statistical analysis using Cartesian landmark coordinates for this assessment. In this report, the proposed geometric morphometric approaches have been structured into systematic steps to study the sexual dimorphism of the mandible from two-dimensional (2-D) digital images. Based on the newly developed imaging technique, the variation of mandible size and shape is compared between males and females. Furthermore, the allometry patterns of the mandible could be visualized. Materials and methods: A total of 113 human adult mandibles (65 males, 48 females) were sampled. Twelve selected significant landmarks were plotted on the 2-D image by landmarking software and subsequently subjected to MorphoJ analysis. Results: The initial five principal components accounted for a substantial morphological variance, representing 84.2% of the cumulative variance in the overall dataset (PC1 27.0%, PC2 22.5%, PC3 20.9%, PC4 7.9%, PC5 5.9%). The variance visualization showed a significant difference between the mandible shape of males and females with classification accuracy of 92.0% and cross validation accuracy of 85.7%. Conclusion: This study provides compelling evidence that digital geometric morphometric analysis can serve as an alternative or complementary method for studying sexual dimorphism in the human mandible. |
| first_indexed | 2025-11-15T14:47:46Z |
| format | Article |
| id | upm-120251 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T14:47:46Z |
| publishDate | 2024 |
| publisher | Faculty of Medicine and Health Sciences, Universiti Putra Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-1202512025-09-29T03:11:05Z http://psasir.upm.edu.my/id/eprint/120251/ Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images Tan, Lii Jye Chai, Tong-Yuen Koh, Cai Ping Shafee, Mohamed Swarhib Hiu, Jessie Lai, Shau-Kong Mohd Nor, Faridah Introduction: Assessment of the human mandible has been a component of biological identification in forensic anthropological practice. We employed the digital geometric morphometric analysis, a statistical analysis using Cartesian landmark coordinates for this assessment. In this report, the proposed geometric morphometric approaches have been structured into systematic steps to study the sexual dimorphism of the mandible from two-dimensional (2-D) digital images. Based on the newly developed imaging technique, the variation of mandible size and shape is compared between males and females. Furthermore, the allometry patterns of the mandible could be visualized. Materials and methods: A total of 113 human adult mandibles (65 males, 48 females) were sampled. Twelve selected significant landmarks were plotted on the 2-D image by landmarking software and subsequently subjected to MorphoJ analysis. Results: The initial five principal components accounted for a substantial morphological variance, representing 84.2% of the cumulative variance in the overall dataset (PC1 27.0%, PC2 22.5%, PC3 20.9%, PC4 7.9%, PC5 5.9%). The variance visualization showed a significant difference between the mandible shape of males and females with classification accuracy of 92.0% and cross validation accuracy of 85.7%. Conclusion: This study provides compelling evidence that digital geometric morphometric analysis can serve as an alternative or complementary method for studying sexual dimorphism in the human mandible. Faculty of Medicine and Health Sciences, Universiti Putra Malaysia 2024-12 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/120251/1/120251.pdf Tan, Lii Jye and Chai, Tong-Yuen and Koh, Cai Ping and Shafee, Mohamed Swarhib and Hiu, Jessie and Lai, Shau-Kong and Mohd Nor, Faridah (2024) Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images. Malaysian Journal of Medicine and Health Sciences, 20 (suppl. 11). art. no. 7. pp. 51-56. ISSN 1675-8544 ; eISSN: 2636-9346 https://medic.upm.edu.my/upload/dokumen/202412301823008_MJMHS_0889.pdf 10.47836/mjmhs.20.s11.8 |
| spellingShingle | Tan, Lii Jye Chai, Tong-Yuen Koh, Cai Ping Shafee, Mohamed Swarhib Hiu, Jessie Lai, Shau-Kong Mohd Nor, Faridah Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images |
| title | Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images |
| title_full | Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images |
| title_fullStr | Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images |
| title_full_unstemmed | Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images |
| title_short | Practical digital geometric morphometric approach for classifying sexual dimorphism of Malaysian adult mandibles using two-dimensional digital images |
| title_sort | practical digital geometric morphometric approach for classifying sexual dimorphism of malaysian adult mandibles using two-dimensional digital images |
| url | http://psasir.upm.edu.my/id/eprint/120251/ http://psasir.upm.edu.my/id/eprint/120251/ http://psasir.upm.edu.my/id/eprint/120251/ http://psasir.upm.edu.my/id/eprint/120251/1/120251.pdf |