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Arn, Marie-Laure; Dritsas, Konstantinos; Pandis, Nikolaos; Kloukos, Dimitrios (2020). The effects of fixed orthodontic retainers on periodontal health: A systematic review. American journal of orthodontics and dentofacial orthopedics, 157(2), 156-164.e17. Elsevier 10.1016/j.ajodo.2019.10.010