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Outcomes of early versus late treatment of severe Class II high-angle patients

Authors
 Jung-Yul Cha  ;  David B. Kennedy  ;  Patrick K. Turley  ;  Donald R. Joondeph  ;  Hyung-Seon Baik  ;  Chung-Ju Hwang  ;  Peter M. Sinclair 
Citation
 AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS, Vol.156(3) : 375-382, 2019 
Journal Title
 AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS 
ISSN
 0889-5406 
Issue Date
2019
MeSH
Adolescent ; Cephalometry/methods ; Child ; Female ; Humans ; Incisor ; Male ; Malocclusion, Angle Class II/therapy* ; Mandible ; Maxilla ; Molar ; Orthodontics, Corrective/methods* ; Overbite/therapy ; Time Factors ; Treatment Outcome
Abstract
INTRODUCTION: The aim of this work was to compare the skeletal and dental outcomes of 1- versus 2-phase treatment in Class II subjects with difficult-to-treat high-angle severe Class II malocclusions. METHODS: The sample of 120 cases was collected from the private offices of 3 experienced clinicians. The following selection criteria were used: (1) ANB ≥6°, (2) SN-GoGn ≥37° or mandibular plane to Frankfort horizontal plane ≥30°; and (3) overjet ≥6 mm. Patients were classified into either the early or the late treatment group according to dental age (early Tx: ≥5 primary teeth; late Tx: otherwise). Thirty-four angular, linear, and proportional measurements were determined for each patient. Statistical significance was assessed with the use of a 2-tailed t test, analysis of covariance test, and chi-square test. RESULTS: The results showed that early 2-phase treatment for severe Class II high-angle patients offered no skeletal anteroposterior advantages over late 1-phase treatment. Severe high-angle Class II patients also showed similar dental anteroposterior outcomes with the use of both approaches. Vertically there was a higher frequency of increased mandibular plane angles and extrusion of upper incisors and lower molars in the late treatment group. CONCLUSIONS: Early 2-phase treatment for severe Class II high-angle patients offered no skeletal or dental advantage over late 1-phase treatment.
Full Text
https://www.sciencedirect.com/science/article/pii/S0889540619305165
DOI
10.1016/j.ajodo.2018.10.019
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Orthodontics (교정과학교실) > 1. Journal Papers
Yonsei Authors
Baik, Hyoung Seon(백형선)
Cha, Jung Yul(차정열)
Hwang, Chung Ju(황충주) ORCID logo https://orcid.org/0000-0003-3024-4551
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/174783
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