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The European Journal of Orthodontics Advance Access published online on April 23, 2009
The European Journal of Orthodontics, doi:10.1093/ejo/cjn115
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© The Author 2009. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Comparative efficiency of Class II malocclusion treatment with the pendulum appliance or two maxillary premolar extractions and edgewire appliances

Célia Regina Maio Pinzan-Vercelino, Guilherme Janson, Arnaldo Pinzan, Renato Rodrigues de Almeida, Marcos Roberto de Freitas and Karina Maria Salvatore de Freitas

Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil

Address for correspondence Dr Célia Regina Maio Pinzan-Vercelino, Alameda dos Sabiás, 58, Portal dos Pássaros, Boituva, SP 18550-000, Brazil, E-mail: cepinzan{at}hotmail.com


  Abstract

The objective of this study was to compare, on study models and initial cephalograms, the efficiency of Class II malocclusion treatment with the pendulum appliance, and with two maxillary premolar extraction protocol. The sample consisted of 48 treated Class II malocclusion patients: group 1 comprised 22 patients (7 males, 15 females) treated with the pendulum appliance, with an initial mean age of 14.44 years and group 2, 26 patients (14 males, 12 females) treated with two maxillary premolar extractions at an initial mean age of 13.66 years. To compare the efficiency of each treatment protocol, the occlusal outcomes were evaluated on dental casts using the Peer Assessment Rating (PAR) Index and the treatment time (TT) of each group was calculated on clinical charts. The degree of treatment efficiency was calculated as the ratio between the percentage of occlusal improvement, evaluated through the PAR index, and TT. Statistical analysis was undertaken by means of t-tests.

The findings demonstrated that the two maxillary premolar extraction protocol provided the occlusal outcomes in a shorter time (group 1: 45.7 months, group 2: 23.01 months) and, therefore, demonstrated greater treatment efficiency than the pendulum appliance.


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