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Comparison of longitudinal treatment effects with facemask and chincup therapy followed by fixed orthodontic treatment on Class III malocclusion

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Authors
Lee, Nam-Ki; Baek, Seung-Hak
Issue Date
2009
Publisher
KOREAN ASSOCIATION OF ORTHODONTISTS
Citation
Korean J Orthod 2009;39(6):362-371
Keywords
Class III malocclusionFacemaskChin cupLongitudinal evaluation
Abstract
Objective: The purpose of this study was to compare the longitudinal treatment effects of facemask with
rapid maxillary expansion (FM/RME) and chincup (CC) therapy followed by fixed orthodontic treatment
(FOT) in Class III malocclusion (CIII) patients. Methods: The samples consisted of twenty-one CIII patients
who had similar skeletal and dental characteristics before FM/RME or CC therapy and good retention results
(Class I molar/canine relationship and positive overbite/overjet) after FOT (Group 1, FM/RME, n =
11; Group 2, CC, n = 10). Lateral cephalograms were taken before (T0) and after FM/RME or CC therapy
(T1), and after FOT and retention (T2). Skeletal and dental variables were measured. Mann-Whitney U-test
and Wilcoxon signed-rank test were used for statistical analysis. Results: During T0-T1, FM/RME therapy
induced forward movement of point A, and labioversion of the upper incisors. Both groups showed posterior
repositioning of the mandible. FM/RME resulted in increase of the vertical dimension; however, CC caused
an increase in articular angle and decrease in gonial angle. During T1-T2, both groups exhibited forward
growth of point A. Group 1 showed forward growth and counterclockwise rotation of the mandible and increase
of IMPA; however, Group 2, showed increase of ANS-Me/N-Me and decrease of overbite.
Conclusions: The key factor for successful FM/RME and CC therapy and good retention results might be
a harmonized forward growth of the maxilla that could keep pace with the growth and rotation of the
mandible.
ISSN
1225-5610
Language
English
URI
https://hdl.handle.net/10371/66614
DOI
https://doi.org/10.4041/kjod.2009.39.6.362
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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