Influence of rapid palatal expansion on maxillary incisor alignment stability
Received April 2009; received in revised form June 2009; accepted June 2009.
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Editor's Summary and Q&A: Influence of rapid palatal expansion on maxillary incisor alignment stability
Luiz Filiphe Gonçalves Canuto, Marcos Roberto de Freitas, Guilherme Janson, Karina Maria Salvatore de Freitas, Patrícia Paschoal Martins
American Journal of Orthodontics & Dentofacial Orthopedics
February 2010 (Vol. 137, Issue 2, Pages 164-165) Abstract |
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Introduction
The purpose of this retrospective study was to compare the long-term stability of maxillary incisor alignment in patients treated with and without rapid maxillary expansion (RME).
Methods
The sample comprised 48 subjects with Class I and Class II malocclusions, treated without extractions with fixed edgewise appliances, divided into 2 groups according to the treatment protocol: group 1 comprised 25 patients (15 girls, 10 boys) at a mean initial age of 13.53 years (SD, 1.63), who had RME during orthodontic treatment. Group 2 comprised 23 patients (13 girls, 10 boys) at a mean initial age of 13.36 years (SD, 1.81 years), treated with fixed appliances without RME. Maxillary dental cast measurements were obtained at the pretreatment, posttreatment, and long-term posttreatment stages. Variables assessed were the irregularity index and maxillary arch dimensions. Intergroup comparisons were made with independent t tests.
Results
Greater transverse increases were found during treatment in the group treated with RME. However, during the long-term posttreatment period, no significant difference was observed in the amount of incisor crowding relapse between the groups.
Conclusions
RME did not influence long-term maxillary anterior alignment stability.
aGraduate student, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil
bProfessor, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil
cProfessor and head, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil
Reprint requests to: Luiz Filiphe Gonçalves Canuto, Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, São Paulo, 17012-901, Brazil.
The authors report no commercial, proprietary, or financial interest in the products or companies described in this article.
ABSTRACT