抄録
The purpose of this study is to specify posttreatment changes occurring in the dentofacial complex displaced by orthodontic treatment of patients with complete growth and development. Nineteen patients, completely grown and developed, selected for this study, and treated by the edgewise technique, had a time-elapse of at least two years between posttreatment and postretention. With the use of gnathostatic models and roentgenographic cephalograms, angles and distances were measured and compared pretreatment, posttreatment and postretention. The results were as follows : 1. The changes in skeletal pattern In the case of starting the orthodontic treatment after complete growth and development, the skeletal pattern of ∠SNA, ∠SNB, ∠SN-Mp changed during the orthodontic treatment but almost no relapse was shown. 2. The changes in denture pattern In the case of starting the orthodontic treatment after complete growth and development, the denture pattern of ∠SN-Occ. and lower intermolar width changed significantly during the orthodontic treatment but almost no relapse was shown.
