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3D-Geomorphometrics tooth shape analysis in hypodontia

Al-Shahrani, Ibrahim; Dirks, Wendy; Jepson, Nicholas; Khalaf, Khaled

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Authors

Ibrahim Al-Shahrani

Wendy Dirks

Nicholas Jepson

Khaled Khalaf



Contributors

Wendy Dirks gmts34@durham.ac.uk
Other

Abstract

Assessment of tooth morphology is an important part of the diagnosis and management of hypodontia patients. Several techniques have been used to analyze tooth form in hypodontia patients and these have shown smaller tooth dimensions and anomalous tooth shapes in patients with hypodontia when compared with controls. However, previous studies have mainly used 2D images and provided limited information. In the present study, 3D surface-imaging and statistical shape analysis were used to evaluate tooth form differences between hypodontia and control patients. Eighteen anatomical landmarks were recorded on the clinical crown of the lower left first permanent molar of 3D scanned study models of hypodontia and control subjects. The study sample group comprised of 120 hypodontia patients (40 mild, 40 moderate, and 40 severe hypodontia patients) and 40 age- and sex-matched controls. Procrustes coordinates were utilized to scale and superimpose the landmark coordinate data and then were subjected to principal component analysis (PCA). Subsequently, differences in shape as well as size were tested statistically using allometric analysis and MANOVA. Significant interaction was found between the two factor variables “group” and “sex” (p < 0.002). Overall expected accuracies were 66 and 56% for females and males, respectively, in the cross-validated discriminant-analysis using the first 20 PCs. Hypodontia groups showed significant shape differences compared with the control subjects (p < 0.0001). Significant differences in tooth crown shape were also found between sexes (p < 0.0001) within groups. Furthermore, the degree of variation in tooth form was proportional to the degree of the severity of the hypodontia. Thus, quantitative measurement of tooth shape in hypodontia patients may enhance the multidisciplinary management of those patients.

Citation

Al-Shahrani, I., Dirks, W., Jepson, N., & Khalaf, K. (2014). 3D-Geomorphometrics tooth shape analysis in hypodontia. Frontiers in Physiology, 5, Article 154. https://doi.org/10.3389/fphys.2014.00154

Journal Article Type Article
Acceptance Date Mar 31, 2014
Online Publication Date Apr 23, 2014
Publication Date Apr 23, 2014
Deposit Date Sep 9, 2014
Publicly Available Date Sep 9, 2015
Journal Frontiers in Physiology
Electronic ISSN 1664-042X
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 5
Article Number 154
DOI https://doi.org/10.3389/fphys.2014.00154
Keywords Hypodontia, Procrustes analysis, Shape analysis, Teeth.
Public URL https://durham-repository.worktribe.com/output/1421116

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Published Journal Article (2.1 Mb)
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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
© 2014 Al-Shahrani, Dirks, Jepson and Khalaf. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.






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