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KJO Korean Journal of Orthodontics

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eISSN 2005-372X
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Korean J Orthod

Published online March 23, 2022

Copyright © The Korean Association of Orthodontists.

An updated study on common dental anomalies in Korean orthodontic patients

Ja Hyeong Ku1, Byoul Han2, Jaehyun Kim3, Jiyoung Oh4, Yoon-Ah Kook5, Yoonji Kim6

1) Former Resident, Department of Orthodontics, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea.
2) Former Graduate student, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea
3, 4) Resident, Department of Orthodontics, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea.
5) Professor, Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6) Associate professor and Chair, Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.

Correspondence to:Yoonji Kim
Department of Orthodontics, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-Gu, Seoul, 06591, Korea.
Tel: +82 2 2258 1776, Fax: +82 2 537 2374
E-mail: juice@catholic.ac.kr; kyoonji@gmail.com

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: The purpose of this study was 1) to investigate the prevalence and pattern of dental anomalies (DAs), 2) to compare them according to malocclusion type, and 3) to investigate the correlation between tooth impaction and other DAs in Korean orthodontic population.
Methods: A total of 3240 orthodontic patients were classified as Class I, Class II, or Class III malocclusion group. The presence and location of the common DAs; impaction, microdontia, agenesis, supernumerary tooth, transposition, and fusion were identified by examining diagnostic records. Furthermore, the same sample was classified as Group 1 without impaction or Group 2 with impaction. The prevalence of other DAs concurrent with impaction was investigated and compared with Group 1.
Results: Impaction was the most prevalent DA, followed by microdontia, agenesis, and supernumerary in the total sample. Class I and Class III groups showed the same order of prevalence, but agenesis was more frequent than microdontia in Class II group. The prevalence of four DAs was lowest in Class III group. Among the total sample, 8.6% of patients were classified into Group 2. The incidence of DAs other than impaction and the prevalence of multiple concurrent DAs were significantly higher in Group 2. Impaction had a significant relationship with supernumerary tooth, transposition, and fusion.
Conclusions: The prevalence and pattern of DAs varied depending on the type of malocclusion. As there was higher risk of other DAs in patients with impacted tooth, early detection of impacted tooth and detailed diagnosis of other possible DAs may be essential.

Keywords: Dentofacial anomalies, Classification, Tooth impaction

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Korean J Orthod

Published online March 23, 2022

Copyright © The Korean Association of Orthodontists.

An updated study on common dental anomalies in Korean orthodontic patients

Ja Hyeong Ku1, Byoul Han2, Jaehyun Kim3, Jiyoung Oh4, Yoon-Ah Kook5, Yoonji Kim6

1) Former Resident, Department of Orthodontics, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea.
2) Former Graduate student, Graduate School of Clinical Dental Science, The Catholic University of Korea, Seoul, Korea
3, 4) Resident, Department of Orthodontics, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea.
5) Professor, Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6) Associate professor and Chair, Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.

Correspondence to:Yoonji Kim
Department of Orthodontics, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, 222 Banpo-daero, Seocho-Gu, Seoul, 06591, Korea.
Tel: +82 2 2258 1776, Fax: +82 2 537 2374
E-mail: juice@catholic.ac.kr; kyoonji@gmail.com

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: The purpose of this study was 1) to investigate the prevalence and pattern of dental anomalies (DAs), 2) to compare them according to malocclusion type, and 3) to investigate the correlation between tooth impaction and other DAs in Korean orthodontic population.
Methods: A total of 3240 orthodontic patients were classified as Class I, Class II, or Class III malocclusion group. The presence and location of the common DAs; impaction, microdontia, agenesis, supernumerary tooth, transposition, and fusion were identified by examining diagnostic records. Furthermore, the same sample was classified as Group 1 without impaction or Group 2 with impaction. The prevalence of other DAs concurrent with impaction was investigated and compared with Group 1.
Results: Impaction was the most prevalent DA, followed by microdontia, agenesis, and supernumerary in the total sample. Class I and Class III groups showed the same order of prevalence, but agenesis was more frequent than microdontia in Class II group. The prevalence of four DAs was lowest in Class III group. Among the total sample, 8.6% of patients were classified into Group 2. The incidence of DAs other than impaction and the prevalence of multiple concurrent DAs were significantly higher in Group 2. Impaction had a significant relationship with supernumerary tooth, transposition, and fusion.
Conclusions: The prevalence and pattern of DAs varied depending on the type of malocclusion. As there was higher risk of other DAs in patients with impacted tooth, early detection of impacted tooth and detailed diagnosis of other possible DAs may be essential.

Keywords: Dentofacial anomalies, Classification, Tooth impaction