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KJO Korean Journal of Orthodontics

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pISSN 2234-7518
eISSN 2005-372X
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Korean J Orthod   

First Published Date August 23, 2022

Copyright © The Korean Association of Orthodontists.

Crown-root angulations of the maxillary anterior teeth according to malocclusions: A cone-beam computed tomography study in Korean population

Kyoung-Hoon Leea, Dong-Soon Choib, Insan Jangb, Bong-Kuen Chab

aPostgraduate student, Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Gangneung, South Korea
bProfessor, Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Gangneung, South Korea

Correspondence to:Dong-Soon Choi, D.D.S., M.S.D., PhD.
Professor, Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Jukheon gil-7, Gangneung, Gangwon, South Korea, 25457.
Phone: +82-33-640-3152
E-mail: dschoi@gwnu.ac.kr

Abstract

Objective: To compare crown-root angulations of the permanent maxillary anterior teeth in skeletal Class I, Class II, and Class III Korean malocclusion patients using cone-bean computed tomography (CBCT) images.
Material and Methods: Sixty CBCT images were collected from orthodontic patients archive based on skeletal Class I (0˚< ANB < 4˚), Class II (ANB ≥ 4˚), and Class III (ANB ≤ 0˚) to have 20 samples in each group. Mesiodistal crown-root angulation (MDCRA) and labiolingual crown-root angulation (LLCRA) were evaluated after orientation of images. Crown-root angulations were compared among Class I, Class II, and Class III groups and among the maxillary anterior teeth in each group.
Results: LLCRAs of the maxillary central incisor and the lateral incisor were significantly lower in Class III group than those in Class I group. However, those of the canine showed no significant differences among groups. MDCRAs of the maxillary anterior teeth did not significantly differ among groups either.
Conclusions: Our results suggest that skeletal Class III malocclusion might affect labiolingual crown-root angulation of the maxillary incisors, especially the central incisor.

Keywords: CT, Tooth shape, Class III, Malocclusion

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Korean J Orthod   

First Published Date August 23, 2022

Copyright © The Korean Association of Orthodontists.

Crown-root angulations of the maxillary anterior teeth according to malocclusions: A cone-beam computed tomography study in Korean population

Kyoung-Hoon Leea, Dong-Soon Choib, Insan Jangb, Bong-Kuen Chab

aPostgraduate student, Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Gangneung, South Korea
bProfessor, Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Gangneung, South Korea

Correspondence to:Dong-Soon Choi, D.D.S., M.S.D., PhD.
Professor, Department of Orthodontics, College of Dentistry, Gangneung-Wonju National University, Jukheon gil-7, Gangneung, Gangwon, South Korea, 25457.
Phone: +82-33-640-3152
E-mail: dschoi@gwnu.ac.kr

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Objective: To compare crown-root angulations of the permanent maxillary anterior teeth in skeletal Class I, Class II, and Class III Korean malocclusion patients using cone-bean computed tomography (CBCT) images.
Material and Methods: Sixty CBCT images were collected from orthodontic patients archive based on skeletal Class I (0˚< ANB < 4˚), Class II (ANB ≥ 4˚), and Class III (ANB ≤ 0˚) to have 20 samples in each group. Mesiodistal crown-root angulation (MDCRA) and labiolingual crown-root angulation (LLCRA) were evaluated after orientation of images. Crown-root angulations were compared among Class I, Class II, and Class III groups and among the maxillary anterior teeth in each group.
Results: LLCRAs of the maxillary central incisor and the lateral incisor were significantly lower in Class III group than those in Class I group. However, those of the canine showed no significant differences among groups. MDCRAs of the maxillary anterior teeth did not significantly differ among groups either.
Conclusions: Our results suggest that skeletal Class III malocclusion might affect labiolingual crown-root angulation of the maxillary incisors, especially the central incisor.

Keywords: CT, Tooth shape, Class III, Malocclusion