A Geometric Morphometric Analysis of the Crown Form of the Maxillary Central Incisor in Humans
| Autor: | Masaaki Mochimaru, Norikazu Ohno, Akiko Kato, Ayamoto Isomura, Makiko Kouchi |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Orthodontics
Enamel paint medicine.medical_treatment GN49-298 RK1-715 Dental-enamel junction Crown (dentistry) Physical anthropology. Somatology stomatognathic diseases stomatognathic system Morphometric analysis Crown form Dentistry visual_art Principal component analysis visual_art.visual_art_medium medicine Maxillary central incisor Distance matrices in phylogeny Mathematics |
| Zdroj: | Dental Anthropology, Vol 24, Iss 1, Pp 1-10 (2011) |
| ISSN: | 1096-9411 |
| DOI: | 10.26575/daj.v24i1.56 |
| Popis: | Dental traits have been studied over a long period and grossly evaluated using standard reference plaques. However, grading by subjective observation may result in inter-observer measurement errors. We aimed to analyze crown models three-dimensionally to assess the morphology of the lingual surface termed shovel shape. Micro-CT scanned data of 38 maxillary central incisors stored at two different laboratories were used to create crown models of the outer enamel surface (OES) and the dentinoenamel junction (DEJ). Original crown data were evaluated according to the grade of shoveling into weak and strong groups. Homologous models consisting of the same number of data points were created and the distance matrices between tooth models of OES and DEJ were respectively analyzed by using multidimensional scaling analysis (MDS) and principal component analysis. Student’s t-test was used to compare corresponding scores between the two groups based on shovel-shape. The results of a t-test in the OES model indicated significant differences between the two groups. In contrast, the result in the DEJ model did not reveal a statistically significant difference. Our results indicate that geometric morphometric analysis of micro-CT scanned tooth crowns represents a powerful solution for the objective shape assessment of human teeth. |
| Databáze: | OpenAIRE |
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