Title: External Apical Root Resorption in Orthodontic Patients
Ejvis Lamani (Presenter)
University of Alabama at Birmingham
Clark Browne, University of Alabama at Birmingham
Chung How Kau, University of Alabama at Birmingham
Objectives: External apical root resorption (EARR), which occurs in about one third of patients as a consequence of orthodontic treatment, is a serious complication that results in permanent loss of radicular structures. Individuals vary in their susceptibility to EARR and a number of treatment-related and patient-related factors have been implicated in its pathology. Objective: To evaluate the prevalence of EARR in orthodontic patients and identify patient related factors associated with an increased risk of developing this disorder.
Methods: Orthodontic records of 73 Caucasian patients (27 males and 46 females) were analyzed. Patients were selected based on age at initial records (13-35 years old) and completion of orthodontic treatment within 30 months. No patients with craniofacial syndromes, history of trauma or prior orthodontic treatment were included. Patients with radiographic evidence of open apices in the incisors and first molars were also excluded. Dolphin Imagine System was used to measure root lengths and crown heights of maxillary and mandibular incisors and mandibular first molars. Root resorption was recorded when 2mm or more of root structure loss was observed on final radiographs. Chi-square statistics were used to evaluate the effects of patient and treatment related factors on root resorption.
Results: The overall EARR prevalence in this cohort was 60.27%. Maxillary laterals were the most affected teeth (29% had EARR) followed by maxillary centrals (25%). Mandibular incisors were the least affected teeth in the study (10%). We found no significant correlations between EARR and treatment related factors. Of the patients related factors significant association with development of EARR was only seen with maxillary incisor proclination (p=0.000032).
Conclusions: Our assessment of EARR prevalence indicates a greater risk for orthodontic patients than previously reported. Better understanding of the factors associated with this disorder will enhance treatment and reduce patients’ risk of root resorption.