Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved]
Introduction The primary aim of the study is to evaluate the morphological form of the maxillary first premolar using 2D geomorphometry and evaluate the sexually dimorphic characteristics. Methods The present study was carried out on standardized photographs of right Maxillary first premolar from 12...
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F1000 Research Ltd
2024-02-01
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| Online Access: | https://f1000research.com/articles/11-433/v3 |
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| author | Junaid Ahmed Srikant Natarajan Shravan Shetty Nidhin Philip Jose |
| author_facet | Junaid Ahmed Srikant Natarajan Shravan Shetty Nidhin Philip Jose |
| author_sort | Junaid Ahmed |
| collection | DOAJ |
| description | Introduction The primary aim of the study is to evaluate the morphological form of the maxillary first premolar using 2D geomorphometry and evaluate the sexually dimorphic characteristics. Methods The present study was carried out on standardized photographs of right Maxillary first premolar from 120 dental casts (60 male and 60 females). Twenty landmarks (based on geometric and anatomic evidence) were marked on the tooth using TPSdig software and analysed using Morpho J applying procrustes analysis and discriminant function analysis. Results The results showed similar centroid sizes between gender (p = 0.541). Procrustes ANOVA for shape analysis showed a greater dimorphism between sexs (f value of 1.35; p value=0.0793). Discriminant function analysis based on the procrustes coordinates showed an overall accuracy of 74.2 % in classifying sex based on the landmark coordinates with correct classification of 48/60 (80.00%) females and 41/60 (68.33) males. Conclusion Shape of the tooth can be measured objectively using geometric morphometric methods which can be utilized to identify the sex of an individual. The enamel is derived from ectoderm and once formed does not change during the life. The tooth’s structure and shape are determined by the sex chromosomes, which is well represented as sexual dimorphism. The study evaluates the occlusal and contact area morphology of premolars. These are important parameters considered during restorative treatment, functional rehabilitation and forensic investigations. |
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| id | doaj.art-f64534a2b4cc4789a78f316afcb87b2a |
| institution | Directory Open Access Journal |
| issn | 2046-1402 |
| language | English |
| last_indexed | 2024-04-25T00:18:20Z |
| publishDate | 2024-02-01 |
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| spelling | doaj.art-f64534a2b4cc4789a78f316afcb87b2a2024-03-13T01:00:01ZengF1000 Research LtdF1000Research2046-14022024-02-0111161964Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved]Junaid Ahmed0https://orcid.org/0000-0001-9419-0754Srikant Natarajan1https://orcid.org/0000-0002-2686-0397Shravan Shetty2Nidhin Philip Jose3Department of Oral Medicine and Radiology, Manipal College of Dental Sciences Mangalore, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, 575001, IndiaDepartment of Oral Pathology and Microbiology, Manipal College of Dental Sciences Mangalore, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, 575001, IndiaDepartment of Orthodontics and Dentofacial Orthopaedics, Manipal College of Dental Sciences Mangalore, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, 575001, IndiaDepartment of Orthodontics and Dentofacial Orthopaedics, Manipal College of Dental Sciences Mangalore, Mangalore, Manipal Academy of Higher Education, Manipal, Karnataka, 575001, IndiaIntroduction The primary aim of the study is to evaluate the morphological form of the maxillary first premolar using 2D geomorphometry and evaluate the sexually dimorphic characteristics. Methods The present study was carried out on standardized photographs of right Maxillary first premolar from 120 dental casts (60 male and 60 females). Twenty landmarks (based on geometric and anatomic evidence) were marked on the tooth using TPSdig software and analysed using Morpho J applying procrustes analysis and discriminant function analysis. Results The results showed similar centroid sizes between gender (p = 0.541). Procrustes ANOVA for shape analysis showed a greater dimorphism between sexs (f value of 1.35; p value=0.0793). Discriminant function analysis based on the procrustes coordinates showed an overall accuracy of 74.2 % in classifying sex based on the landmark coordinates with correct classification of 48/60 (80.00%) females and 41/60 (68.33) males. Conclusion Shape of the tooth can be measured objectively using geometric morphometric methods which can be utilized to identify the sex of an individual. The enamel is derived from ectoderm and once formed does not change during the life. The tooth’s structure and shape are determined by the sex chromosomes, which is well represented as sexual dimorphism. The study evaluates the occlusal and contact area morphology of premolars. These are important parameters considered during restorative treatment, functional rehabilitation and forensic investigations.https://f1000research.com/articles/11-433/v3Sexual dimorphism Geometric morphometry Procrustes analysis Maxillary first premolar Principle component analysis Tooth formeng |
| spellingShingle | Junaid Ahmed Srikant Natarajan Shravan Shetty Nidhin Philip Jose Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved] F1000Research Sexual dimorphism Geometric morphometry Procrustes analysis Maxillary first premolar Principle component analysis Tooth form eng |
| title | Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved] |
| title_full | Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved] |
| title_fullStr | Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved] |
| title_full_unstemmed | Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved] |
| title_short | Maxillary first premolar shape (and not size) as an indicator of sexual dimorphism: A 2D geomorphometric study [version 3; peer review: 2 approved, 1 not approved] |
| title_sort | maxillary first premolar shape and not size as an indicator of sexual dimorphism a 2d geomorphometric study version 3 peer review 2 approved 1 not approved |
| topic | Sexual dimorphism Geometric morphometry Procrustes analysis Maxillary first premolar Principle component analysis Tooth form eng |
| url | https://f1000research.com/articles/11-433/v3 |
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