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http://dx.doi.org/10.14368/jdras.2014.30.3.223

Postretention stability after mandibular incisor extractions assessed by cast and radiograph - The American Board of Orthodontics cast and radiographic evaluation  

Lee, Jin-Woo (Department of Orthodontics, College of Dentistry, Dankook University)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.30, no.3, 2014 , pp. 223-230 More about this Journal
Abstract
Purpose: The purpose of this study was to evaluate the improvement and posttreatment stability of patients treated with extraction of lower incisors. Materials and Methods: The total of 20 patients with extracted lower incisors were analyzed by means of diagnostic models and panoramic x-rays at the time of initial, final and after 2 years of retention period of the treatment. Irregularity index, overjet, overbite, tooth size-arch length discrepancy (TSALD), intercanine width, intermolar width and American Board of Orthodontics cast/radiographic evaluation (ABO-CRE) were analyzed. Statistical analysis was performed using Wilcoxon signed-rank test. Results: After treatment, irregularity index showed significant decrease (P = 0.000). TSALD showed significant increase (P = 0.028). During retention period, irregularity index showed significant increase (P = 0.001). For ABO-CRE, total score showed significant decrease after treatment (P = 0.000) and showed average decreased which was not significant result (P = 0.053). Conclusion: Through evaluation of stability of extraction of lower incisors by means of diagnostic models and panoramic x-rays, it can be concluded that lower incisor extraction treatment had been stable for 2 years after treatment.
Keywords
lower incisor extraction; ABO-CRE; irregularity index;
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