Apical root resorption: a prospective radiographic study of maxillary incisors.

Objectives: The aim of this study was to determine the prevalence of apical root resorption in maxillary incisors during the initial stages of active orthodontic treatment and to test the hypothesis that root resorption increases with the progress of the treatment.

Methods: The study sample consisted of 80 teeth of 20 patients (14 female, 6 male) with a mean age of 14.9±2.