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Cephalometric predictors of long-term stability in the early treatment of class III malocclusion

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Authors
Moon, Young-Min; Ahn, Sug-Joon; Chang, Young-Il
Issue Date
2005-09
Publisher
Angle Orthodontist
Citation
Angle Orthodontist 2005;75(5):747-753
Keywords
Class III malocclusionPrognosisDiscriminant analysis
Abstract
The aim of this study was to examine the differences in the early craniofacial morphology
of Class III malocclusions. Lateral cephalograms of 45 subjects with a Class III malocclusion
and an anterior crossbite in the deciduous or mixed dentition were examined before treatment,
after treatment, and during the long-term retention stage. The anterior crossbites of all
patients were corrected after a series of orthodontic treatments. After a mean follow-up period of
5.7 years, all the subjects were reevaluated and divided into three groups according to the final
occlusal status: good, fair, and poor occlusal stability. Twenty cephalometric variables on the
pretreatment lateral cephalograms were analyzed by one-way analysis of variance and discriminant
analysis to identify the key determinants for discriminating among the three groups. Among
the 20 variables, 11 showed statistical significance. Generally, the subjects with a smaller gonial
angle and a more hypodivergent skeletal pattern had good prognosis after the early treatment of
Class III malocclusion. When the AB to mandibular plane angle and N-perpendicular to point A
were selected in discriminant analysis, the AB to mandibular plane angle was the most significant
variable. Discriminant analysis showed a relatively high degree of correct classifications of the
patients with early Class III malocclusion. In particular, discriminant analysis showed the highest
accuracy (93.3%) when predicting a poor prognosis.
ISSN
0003-3219
Language
English
URI
https://hdl.handle.net/10371/68578
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College of Dentistry/School of Dentistry (치과대학/치의학대학원)Dept. of Dentistry (치의학과)Journal Papers (저널논문_치의학과)
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