Abstract
External apical root resorption is a pathologic process associated with orthodontic treatment. The purpose of this study was to evaluate the severity and risk factors associated with root resorption of maxillary central incisors in orthodontic patients who had anterior open bite malocclusions. This retrospective study used randomly selected open bite and control samples, 32 patients in each, screened from 800 orthodontic treatment records at Oregon Health & Science University. The open bite sample was defined as having no vertical overlap of the incisors before treatment.
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