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Medline, Cochrane Library, Biomed Central, BBO including LILACS, Ind Med, Sceilo, Clinical trials.gov, Conference paper Index, Digital Dissertations, German National Library of Medicine (ZB MED), Google Scholar, ISI Web of Knowledge, metaRegister of Controlled Trials, OpenSIGLE, Scirus.Study selectionTwo reviewers independently selected studies. Only randomised controlled trials (RCTs) and quasi-RCTs of parallel or split-mouth design were considered.

Little evidence to guide initial arch wire choice for fixed appliance therapy