Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of diferent dentifrices

Gustavo Antônio Martins BRANDÃO, Rafael Menezes SIMAS, Leandro Moreira de ALMEIDA, Juliana Melo da SILVA, Marcelo de Castro MENEGHIM, Antonio Carlos PEREIRA, Haroldo Amorim de ALMEIDA, Ana Maria Martins BRANDÃO

Objective: To evaluate the in vitro ionic degradation and slot base corrosion of metallic brackets subjected to brushing with dentifrices, through analysis of chemical composition by Energy Dispersive Spectroscopy (EDS) and qualitative analysis by Scanning Electron Microscopy (SEM). Methods: Thirty eight brackets were selected and randomly divided into four experimental groups (n = 7). Two groups (n = 5) worked as positive and negative controls. Simulated orthodontic braces were assembled using 0.019 x 0.025-in stainless steel wires and elastomeric rings. The groups were divided according to surface treatment: G1 (Máxima Proteção Anticáries®); G2 (Total 12®); G3 (Sensitive®); G4 (Branqueador®); Positive control (artiicial saliva) and Negative control (no treatment). Twenty eight brushing cycles were performed and evaluations were made before (T0) and ater (T1) experiment. Results: The Wilcoxon test showed no diference in ionic concentrations of titanium (Ti), chromium (Cr), iron (Fe) and nickel (Ni) between groups. G2 presented signiicant reduction (p < 0.05) in the concentration of aluminium ion (Al). Groups G3 and G4 presented signiicant increase (p < 0.05) in the concentration of aluminium ion. The SEM analysis showed increased characteristics indicative of corrosion on groups G2, G3 and G4. Conclusion: The EDS analysis revealed that control groups and G1 did not sufer alterations on the chemical composition. G2 presented degradation in the amount of Al ion. G3 and G4 sufered increase in the concentration of Al. The immersion in artiicial saliva and the dentifrice Máxima Proteção Anticáries® did not alter the surface polishing. The dentifrices Total 12®, Sensitive® and Branqueador® altered the surface polishing.

Keywords: Orthodontic brackets. Corrosion. Scanning Electron Microscopy.

How to cite: Brandão GAM, Simas RM, Almeida LM, Silva JM, Meneghim MC, Pereira AC, Almeida HA, Brandão AMM. Evaluation of ionic degradation and slot corrosion of metallic brackets by the action of different dentifrices. Dental Press J Orthod. 2013 Jan-Feb;18(1):86-93.

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