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  • Title: Orthodontic treatment time in 2- and 4-premolar-extraction protocols.
    Author: Janson G, Maria FR, Barros SE, Freitas MR, Henriques JF.
    Journal: Am J Orthod Dentofacial Orthop; 2006 May; 129(5):666-71. PubMed ID: 16679207.
    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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