Five-year investigation of a large orthodontic patient population at a dental hospital in South Korea

Yongxu Piao, Sung Jin Kim, Hyung Seog Yu, Jung Yul Cha, Hyoung Seon Baik

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)


Objective: The purpose of this study was to investigate the characteristics of orthodontic patients at Yonsei Dental Hospital from 2008 to 2012. Methods: We evaluated Angle’s classification from molar relationships, classification of skeletal malocclusion from the A point-nasion-B point angle, facial asymmetry, and temporomandibular joint disorders (TMDs) from the records of 7,476 patients who received an orthodontic diagnosis. The orthognathic surgery rate, extraction rate, and extraction sites were determined from the records of 4,861 treated patients. Results: The patient number increased until 2010 and gradually decreased thereafter. Most patients were aged 19−39 years, with a gradual increase in patients aged ≥ 40 years. Angle’s Class I, Class II divisions 1 and 2, and Class III malocclusions were observed in 27.7%, 25.6%, 10.6%, and 36.1% patients, respectively, with a gradual decrease in the frequency of Class I malocclusion. The proportion of patients with skeletal Class I, Class II, and Class III malocclusions was 34.3%, 34.3%, and 31.4%, respectively, while the prevalence of facial asymmetry and TMDs was 11.0% and 24.9%, respectively. The orthognathic surgery rate was 18.5%, with 70% surgical patients exhibiting skeletal Class III malocclusion. The overall extraction rate among nonsurgical patients was 35.4%, and the maxillary and mandibular first premolars were the most commonly extracted teeth. Conclusions: The most noticeable changes over time included a decrease in the patient number after 2010, an increase in the average patient age, and a decrease in the frequency of Angle’s Class I malocclusion. Our results suggest that periodic characterization is necessary to meet the changing demands of orthodontic patients.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalKorean Journal of Orthodontics
Issue number3
Publication statusPublished - 2016 May

Bibliographical note

Publisher Copyright:
© 2016 The Korean Association of Orthodontists.

All Science Journal Classification (ASJC) codes

  • Orthodontics


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