Evaluation of root resorption after palatal expansion by magnetic expansion appliance

VernacularTitle:磁力扩弓对后牙牙根长度的影响
Author: Qiaoling MA ¹ ; Tiemei WANG ; Tuojiang WU ; Shu LIU ; Huang LI
Author Information

1. 南京大学医学院附属口腔医院正畸科
Keywords: root resorption; magnetic palatal expansion; cone-beam computed tomography
From: West China Journal of Stomatology 2013;(6):600-604
CountryChina
Language:Chinese
Abstract: Objective To investigate the root length of posterior teeth after palatal expansion by magnetic expansion ap-pliance. Methods A total of 32 patients who accepted palatal expansion with magnetic expansion appliance were enrolled in the study. Pretreatment and post-treatment cone-beam computed tomography (CBCT) images were obtained. A paired t test was used to evaluate the length change, and a group t test was used to compare the tooth lengths of developing and developed teeth. Results Anchorage teeth showed greater root resorption than non-anchorage teeth, whereas the developed posterior teeth showed reduced resorption. Moreover, the mesial buccal roots of the first molar and first premolar were reduced. No resorption was found in the developing teeth group. Conclusion The magnetic palatal expansion can reduce the root length, particularly of developed root. The developing root of anchorage teeth show greater tolerance to resorption than the developed root. Early palatal expansion treatment with magnetic expansion appliance can reduce the risk of root resorption.