Morphology of palatally impacted canines: a case-controlled cone-beam volumetric tomography study

Hettiarachchi, Pilana Vithanage Kalani Shihanika, Olive, Richard John and Monsour, Paul (2017) Morphology of palatally impacted canines: a case-controlled cone-beam volumetric tomography study. American Journal of Orthodontics and Dentofacial Orthopedics, 151 2: 357-362. doi:10.1016/j.ajodo.2016.06.044


Author Hettiarachchi, Pilana Vithanage Kalani Shihanika
Olive, Richard John
Monsour, Paul
Title Morphology of palatally impacted canines: a case-controlled cone-beam volumetric tomography study
Journal name American Journal of Orthodontics and Dentofacial Orthopedics   Check publisher's open access policy
ISSN 0889-5406
1097-6752
Publication date 2017-02-01
Sub-type Article (original research)
DOI 10.1016/j.ajodo.2016.06.044
Open Access Status Not yet assessed
Volume 151
Issue 2
Start page 357
End page 362
Total pages 6
Place of publication Philadelphia, PA, United States
Publisher Mosby
Language eng
Subject 3505 Orthodontics
Abstract Introduction The aim of this study was to investigate the relationships between an apical curvature or a hook and the crown/root ratio in subjects with and without palatally impacted maxillary canines. Methods An experimental group of 44 patients (17 boys, 27 girls; mean age, 13.6 years) with 59 palatally impacted maxillary canines was selected from the records of patients referred to a radiology practice for cone-beam imaging. If a patient had bilateral palatally impacted canines, 1 canine was randomly selected for analysis. The palatally impacted canine group was matched for age and sex with 49 normal subjects (25 boys, 24 girls; mean age, 13.2 years) with 98 canines. Cone-beam DICOM files were imported into In Vivo imaging software (version 5.3; Anatomage, San Jose, Calif) for analysis. The angulations and linear variables of the maxillary canines were measured by using the software measurement tools. Chi-square and independent t tests were used to test for differences between the groups. Results The presence of a hook at the apical third and other root curvature were significantly different between the 2 groups (P <0.001 and P <0.05, respectively). Of the 44 palatally impacted canines, 16 (36.4%) had an apical hook and only 1 canine in the control group had an apical hook (1.0%). The mean root length of the palatally impacted canines was 2.66 mm shorter (P <0.001), and the mean crown/root ratio was significantly greater for the palatally impacted canines compared with the nonimpacted group (P <0.001). Conclusions Palatally impacted canines have a greater tendency to develop apical hooks and are less likely to develop other root curvatures than are nonimpacted canines. Also, they have shorter roots resulting in larger crown/root ratios compared with the control group.
Formatted abstract
Introduction: The aim of this study was to investigate the relationships between an apical curvature or a hook and the crown/root ratio in subjects with and without palatally impacted maxillary canines.

Methods: An experimental group of 44 patients (17 boys, 27 girls; mean age, 13.6 years) with 59 palatally impacted maxillary canines was selected from the records of patients referred to a radiology practice for cone-beam imaging. If a patient had bilateral palatally impacted canines, 1 canine was randomly selected for analysis. The palatally impacted canine group was matched for age and sex with 49 normal subjects (25 boys, 24 girls; mean age, 13.2 years) with 98 canines. Cone-beam DICOM files were imported into In Vivo imaging software (version 5.3; Anatomage, San Jose, Calif) for analysis. The angulations and linear variables of the maxillary canines were measured by using the software measurement tools. Chi-square and independent t tests were used to test for differences between the groups.

Results: The presence of a hook at the apical third and other root curvature were significantly different between the 2 groups (P <0.001 and P <0.05, respectively). Of the 44 palatally impacted canines, 16 (36.4%) had an apical hook and only 1 canine in the control group had an apical hook (1.0%). The mean root length of the palatally impacted canines was 2.66 mm shorter (P <0.001), and the mean crown/root ratio was significantly greater for the palatally impacted canines compared with the nonimpacted group (P <0.001).

Conclusions: Palatally impacted canines have a greater tendency to develop apical hooks and are less likely to develop other root curvatures than are nonimpacted canines. Also, they have shorter roots resulting in larger crown/root ratios compared with the control group.
Keyword Tooth, Impacted
Canines
Cone beam volumetric tomography
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Dentistry Publications
 
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