Long-term stability of Class II malocclusion treated with 2- and 4-premolar extraction protocols

Introduction The objective of this study was to cephalometrically compare the stability of complete Class II malocclusion treatment with 2 or 4 premolar extractions after a mean period of 9.35 years. Methods A sample of 57 records from patients with complete Class II malocclusion was selected and di...

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Bibliographic Details
Published in:American journal of orthodontics and dentofacial orthopedics 2009-08, Vol.136 (2), p.154.e1-154.e10
Main Authors: Janson, Guilherme, Leon-Salazar, Vladimir, Leon-Salazar, Ruben, Janson, Marcos, de Freitas, Marcos Roberto
Format: Article
Language:English
Subjects:
Adolescent
Bicuspid - surgery
Cephalometry - statistics & numerical data
Child
Dentistry
Female
Follow-Up Studies
Humans
Male
Malocclusion, Angle Class II - therapy
Orthodontics, Corrective - methods
Recurrence
Retrospective Studies
Tooth Extraction
Young Adult
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Summary:Introduction The objective of this study was to cephalometrically compare the stability of complete Class II malocclusion treatment with 2 or 4 premolar extractions after a mean period of 9.35 years. Methods A sample of 57 records from patients with complete Class II malocclusion was selected and divided into 2 groups. Group 1 consisted of 30 patients with an initial mean age of 12.87 years treated with extraction of 2 maxillary premolars. Group 2 consisted of 27 patients with an initial mean age of 13.72 years treated with extraction of 4 premolars. T tests were used to compare the groups' initial cephalometric characteristics and posttreatment changes. Pearson correlation coefficients were calculated to determine the correlation between treatment and posttreatment dental-relationship changes. Results During the posttreatment period, both groups had similar behavior, except that group 1 had a statistically greater maxillary forward displacement and a greater increase in the apical-base relationship than group 2. On the other hand, group 2 had a statistically greater molar-relationship relapse toward Class II. There were significant positive correlations between the amounts of treatment and posttreatment dentoalveolar-relationship changes. Conclusions Treatment of complete Class II malocclusions with 2 maxillary premolar extractions or 4 premolar extractions had similar long-term posttreatment stability.
ISSN:0889-5406
1097-6752
DOI:10.1016/j.ajodo.2009.01.020