Morphological Changes of Mandibular Symphysis during Preoperative Orthodontic Treatment of Adult Female Skeletal Class III Cases

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  • INOUE Ai
    Department of Orthodontics, Showa University School of Dentistry
  • HIRAIDE Takatoshi
    Department of Orthodontics, Showa University School of Dentistry

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  • 成人女性骨格性下顎前突症の術前矯正治療におけるsymphysisの形態変化

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Abstract

The purpose of this study was to investigate the changes of symphysis concerned with labial movement of the lower incisors. The subjects consisted of 20 patients, adult female skeletal class III with mandibular osteotomy treated at Showa University Dental Hospital. The materials consisted of latelal cephalograms at the beginning of orthodontic treatment and the end of preoperative orthodontic treatment. The results were as follows : <BR>1. Significant changes in the cephalogram angle analysis were the labial movement of ∠L1 to the mandibular plane and reduction of ∠FMIA.<BR>2. Significant changes in symphysis were the reduction of B′-Me and Ap′-Me.<BR>3. There was correlation between SNB and ∠L1 to the mandibular plane at the beginning of orthodontic treatment, and between ∠SNB and ∠FMIA, and ∠ANB and ∠FMIA at the end of operative orthodontic treatment.<BR>4. There was correlation between the amount of change in B'-Me and the amount of Ap'-Me.<BR>5. There was no correlation between the cephalogram angle analysis data (∠SNB, ∠ANB, ∠L1 to the mandibular plane and ∠FMIA) at the beginning and the treated changes in symphysis.<BR>These results suggest that the changes in symphysis were found to affect the lower incisor to labial movement, and it also suggested that the change of point Ap for lingually was related to the change of point B as well.

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