Date of Award



Department of Orthodontics

First Advisor

Heesoo Oh


Introduction: The purpose of this study was to evaluate the amount of external apical root resorption (EARR) secondary to orthodontic treatment in patients with Short Root Anomaly (SRA) using Cone Beam Computed Tomography (CBCT) at the University of the Pacific Orthodontic Clinic. Material and Methods: In this retrospective study, CBCTs of forty-eight SRA patients who underwent orthodontic treatment were selected from the graduate orthodontic clinic. CBCTs before and after treatment were analyzed to measure root length changes on the upper central and lateral incisors. Results: Differences between the two methods of assessing SRA severity occurred between categorizing mild and moderate SRA subjects with the quantitative method resulting in more moderate cases and visual method determining more mild cases. Root resorption changes ranged from 0.92-1.3 mm for all incisors. Between the Non-Hispanic and Hispanic group, there was no statistical significance for all tooth length changes. There is a statistically significant difference in the root resorption of SRA teeth and non-SRA teeth (0.55mm). Conclusions: Post orthodontic treatment SRA teeth exhibited less linear changes than non SRA teeth and no differences were found between non-Hispanic and Hispanic upper incisors.