Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 6 1 2009 03 15 46 50 MS. Ahmad Akhoundi Associate Professor, Department of Orthodontics, School of Dentistry, Tehran University of Medical S AH. Sadrhaghighi Postgraduate Student, Department of Orthodontics, School of Dentistry, Tehran University of Medical 2015 10 03 A 7.5 year-old girl was seeking orthodontic treatment because of severe ectopic eruption of maxillary first permanent molars. It was a rare case that represented approximately horizontal view in panoramic radiograph. The severity of problem was high, but since the patient had maxillary deficiency, it was important to perform the treatment without extraction. Treatment began with extraction of upper deciduous second molars and continued with a modified Nance appliance. The period of treatment was 16 months and the result was excellent. This satisfactory outcome of treatment justifies clinicians to evaluate and diagnose this group https://fid.tums.ac.ir/index.php/fid/article/view/177 https://fid.tums.ac.ir/index.php/fid/article/download/177/177