Janson Guilherme, Maria Fábio Rogério Torres, Barros Sérgio Estelita Cavalcante, Freitas Marcos Roberto de, Henriques José Fernando Castanha
Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2006 May;129(5):666-71. doi: 10.1016/j.ajodo.2005.12.026.
The purpose of this study was to compare the treatment times of complete Class II malocclusions treated with 2- and 4-premolar-extraction protocols.
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.
Treatment times were significantly shorter with the 2-premolar-extraction protocol compared with the 4-premolar-extraction protocol.
Treatment time will be shorter and the occlusal results more predictable with a 2-premolar-extraction protocol compared with 4 premolar extractions.
本研究的目的是比较采用拔除两颗前磨牙和四颗前磨牙矫治方案治疗完全性安氏II类错牙合的治疗时间。
根据两种拔牙标准选择97例患者并分为两组。第1组采用拔除两颗上颌前磨牙的方法进行治疗，共49例患者（男30例，女19例），平均年龄14.35岁。第2组采用拔除四颗前磨牙的方法进行治疗，共48例患者（男27例，女21例），平均年龄13.03岁。采用t检验比较两组的治疗时间。
与拔除四颗前磨牙的矫治方案相比，拔除两颗前磨牙的矫治方案治疗时间明显更短。
与拔除四颗前磨牙相比，采用拔除两颗前磨牙的矫治方案治疗时间更短，咬合结果更可预测。
