Background: The aim of this study was to compare the external apical root resorption (EARR) in patients receiving\nfixed orthodontic treatment with self-ligating or conventional brackets.\nMethods: Studies comparing the EARR between orthodontic patients using self-ligating or conventional brackets\nwere identified through electronic search in databases including CENTRAL, PubMed, EMBASE, China National\nKnowledge Infrastructure (CNKI) and SIGLE, and manual search in relevant journals and reference lists of the\nincluded studies until Apr 2016. The extraction of data and risk of bias evaluation were conducted by two\ninvestigators independently. The original outcome underwent statistical pooling by using Review Manager 5.\nResults: Seven studies were included in the systematic review, out of which, five studies were statistically pooled\nin meta-analysis. The value of EARR of maxillary central incisors in the self-ligating bracket group was significantly\nlower than that in the conventional bracket group (SMD âË?â??0.31; 95% CI: âË?â??0.60ââ?¬â??âË?â??0.01). No significant differences in\nother incisors were observed between selfâË?â??ligating and conventional brackets.\nConclusions: Current evidences suggest self-ligating brackets do not outperform conventional brackets in reducing\nthe EARR in maxillary lateral incisors, mandible central incisors and mandible lateral incisors. However, self-ligating\nbrackets appear to have an advantage in protecting maxillary central incisor from EARR, which still needs to be\nconfirmed by more high-quality studies.
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