Kim SH, et al. - An analysis was performed to examine the root apex positions of impacted maxillary canines on panoramic radiographs according to their labiopalatal positions. In addition, the authors intended to propose a new panoramic radiographic predictor of impacted maxillary canines. The root apices of palatally impacted canines tended toward the root apices of the maxillary first premolars on panoramic films, while those of labially impacted canines tended toward the root apices of the maxillary lateral incisors. Hence, the sector locations of affected canine root apices on panoramic radiographs could be used for the early prediction of maxillary canine impactions and determination of the labiopalatal positions of impacted canines.