Abstract
The patient was a 27year and 7months old female patient when treatment first commenced. The chief complaint was the upper anteriors crowding. The molar relation was Angle ClassⅡand the overjet was＋7.2mm. Cephalometric analysis showed ANB of ＋9.6°and lessgrowth of mandible. Upper and lower central incisors were flaring. The patient was diagnosed with Angle ClassⅡ malocclusion division 1 with lessgrowth of mandible and crowding. Non-extractin of the lower bicuspids was planned initially in order to correct of overjet , however, the treatment performed with the extraction of two upper first premolars and two lower second premolars because of the upper and lower central incisors were flaring and the lower arch discrepancy were －5.2mm.The patient was treated using palatal bar and elastics for the correction of Angle Class Ⅱ molar relation. Active treatment time were 31 months. Stable occlusion and good function have been maintained for 3 years 10 months post-treatment.
