Reliability of Periapical Photographs in the Evaluation of Root Shortening During Orthodontic Intrusion

Apical root resorption is a common adverse effect during orthodontic treatment, specially the intrusion forces. Apical photographs by using the parallel technique and with the help of some formulas were the most common approaches to investigate the root resorption. The aim of this study was to study the reliability of periapical photographs in evaluating of root length shortening during orthodontic intrusion forces, by comparing with that diagnosed by using the CT-scan images.