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Comparative Study
. 2006 May;129(5):666-71.
doi: 10.1016/j.ajodo.2005.12.026.

Orthodontic treatment time in 2- and 4-premolar-extraction protocols

Guilherme Janson  1 , Fábio Rogério Torres Maria, Sérgio Estelita Cavalcante Barros, Marcos Roberto de Freitas, José Fernando Castanha Henriques
Affiliations
Comparative Study

Orthodontic treatment time in 2- and 4-premolar-extraction protocols

Guilherme Janson et al. Am J Orthod Dentofacial Orthop. 2006 May.

Abstract

Introduction: The purpose of this study was to compare the treatment times of complete Class II malocclusions treated with 2- and 4-premolar-extraction protocols.

Methods: Ninety-seven patients were selected and divided into 2 groups, according to the 2 extraction criteria. Group 1, treated with 2 maxillary premolar extractions, consisted of 49 patients (30 male, 19 female) with a mean age of 14.35 years. Group 2, treated with 4 premolar extractions, consisted of 48 patients (27 male, 21 female) with a mean age of 13.03 years. Treatment times of the groups were compared with the t test.

Results: Treatment times were significantly shorter with the 2-premolar-extraction protocol compared with the 4-premolar-extraction protocol.

Conclusions: Treatment time will be shorter and the occlusal results more predictable with a 2-premolar-extraction protocol compared with 4 premolar extractions.

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