2017-06-162017-06-162016-08LEITE, Brisa dos Santos et al. Cleansing orthodontic brackets with air-powder polishing: effects on frictional force and degree of debris. Dental Press Journal Orthodontics, Maringá, v. 21, n. 4, p. 60-65, jul./ago. 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2176-94512016000400060&lng=pt&nrm=iso>. Acesso em: 16 jun. 2017. <http://dx.doi.org/10.1590/2177-6709.21.4.060-065.oar>.2177-6709https://repositorio.ufpa.br/handle/2011/8706Introduction: Debris buildup on the bracket-wire interface can influence friction. Cleansing brackets with air-powder polishing can affect this process. Objective: The aim of this study was to evaluate the frictional force and amount of debris remaining on orthodontic brackets subjected to prophylaxis with air-powder polishing. Methods: Frictional force and debris buildup on the surface of 28 premolar brackets were evaluated after orthodontic treatment. In one hemiarch, each bracket was subjected to air-powder polishing (n = 14) for five seconds, while the contralateral hemiarch (n = 14) served as control. Mechanical friction tests were performed and images of the polished bracket surfaces and control surfaces were examined. Wilcoxon test was applied for comparative analysis between hemiarches at p < 0.05. Results: Brackets that had been cleaned with air-powder polishing showed lower friction (median = 1.27 N) when compared to the control surfaces (median = 4.52 N) (p < 0.01). Image analysis showed that the control group exhibited greater debris buildup (median = 2.0) compared with the group that received prophylaxis with air-powder polishing (median = 0.5) (p < 0.05). Conclusion: Cleansing orthodontic brackets with air-powder polishing significantly reduces debris buildup on the bracket surface while decreasing friction levels observed during sliding mechanics.Acesso AbertoSuportes ortodônticosBraquetes ortodônticosProfilaxia dentalTratamento odontológicoArtigo de Periódico