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KMID : 1004520140300030223
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Journal of Dental Rehabilitation and Applied Science
2014 Volume.30 No. 3 p.223 ~ p.230
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Postretention stability after mandibular incisor extractions assessed by cast and radiograph ? The American Board of Orthodontics cast and radiographic evaluation
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Lee Jin-Woo
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Abstract
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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.
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KEYWORD
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lower incisor extraction, ABO-CRE, irregularity index
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