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Effect of premolar extraction and presence of the lower third molar on lower second molar angulation in orthodontic treatment

Authors
 Tae-Min You  ;  Bo Hyun Ban  ;  Jin-Sun Jeong  ;  Jisun Huh  ;  Re-Mee Doh  ;  Wonse Park 
Citation
 ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY, Vol.118(3) : 278-283, 2014 
Journal Title
ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY
ISSN
 2212-4403 
Issue Date
2014
MeSH
Bicuspid/diagnostic imaging ; Bicuspid/surgery* ; Female ; Humans ; Male ; Molar/diagnostic imaging ; Molar/physiology* ; Molar, Third/diagnostic imaging ; Molar, Third/physiology* ; Orthodontics, Corrective* ; Radiography, Panoramic ; Retrospective Studies ; Tooth Extraction*
Abstract
OBJECTIVE: To evaluate the change in mandibular second-molar (M2) angulation in orthodontic treatment with premolar extraction and lower third molar (M3).
STUDY DESIGN: Panoramic radiographs were evaluated in 3 groups of 129 participants: (1) control, no orthodontic treatment (n = 65); (2) extraction, orthodontic treatment with premolar extraction (n = 30); and (3) nonextraction, orthodontic treatment without premolar extraction (n = 34). The angular difference and ratio of M2 to the first molar (M1), the change in the angulation of M2 between pre- and postorthodontic treatment, and the distal bone level of M2 were assessed.
RESULTS: The angular difference and ratio of M2 to M1, the angulation change of M2 between pre- and postorthodontic treatment, and the distal bone level of M2 were higher in the nonextraction group than in the control and extraction groups.
CONCLUSIONS: The successful orthodontic alignment of the M2 may not be achieved in nonextraction cases when the M3s are present.
Full Text
http://www.sciencedirect.com/science/article/pii/S2212440314004672
DOI
10.1016/j.oooo.2014.05.002
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Advanced General Dentistry (통합치의학과) > 1. Journal Papers
Yonsei Authors
Park, Wonse(박원서) ORCID logo https://orcid.org/0000-0002-2081-1156
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/99506
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