Brandão Gustavo Antônio Martins, Simas Rafael Menezes, de Almeida Leandro Moreira, da Silva Juliana Melo, Meneghim Marcelo de Castro, Pereira Antonio Carlos, de Almeida Haroldo Amorim, Brandão Ana Maria Martins
Federal University of Pará.
Dental Press J Orthod. 2013 Jan-Feb;18(1):86-93. doi: 10.1590/s2176-94512013000100019.
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).
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 (artificial saliva) and Negative control (no treatment). Twenty eight brushing cycles were performed and evaluations were made before (T0) and after (T1) experiment.
The Wilcoxon test showed no difference in ionic concentrations of titanium (Ti), chromium (Cr), iron (Fe) and nickel (Ni) between groups. G2 presented significant reduction (p < 0.05) in the concentration of aluminium ion (Al). Groups G3 and G4 presented significant 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.
The EDS analysis revealed that control groups and G1 did not suffer alterations on the chemical composition. G2 presented degradation in the amount of Al ion. G3 and G4 suffered increase in the concentration of Al. The immersion in artificial saliva and the dentifrice Máxima Proteção Anticáries® did not alter the surface polishing. The dentifrices Total 12®, Sensitive® and Branqueador® altered the surface polishing.
通过能量色散光谱（EDS）分析化学成分和扫描电子显微镜（SEM）定性分析，评估金属托槽在使用牙膏刷牙后的体外离子降解和槽沟底部腐蚀情况。
选取38个托槽，随机分为4个实验组（n = 7）。两组（n = 5）分别作为阳性和阴性对照。使用0.019×0.025英寸的不锈钢丝和弹性环组装模拟正畸矫治器。根据表面处理将各组分为：G1（Máxima Proteção Anticáries®）；G2（Total 12®）；G3（Sensitive®）；G4（Branqueador®）；阳性对照（人工唾液）和阴性对照（未处理）。进行28次刷牙循环，并在实验前（T0）和实验后（T1）进行评估。
Wilcoxon检验显示，各组之间钛（Ti）、铬（Cr）、铁（Fe）和镍（Ni）的离子浓度无差异。G2组铝离子（Al）浓度显著降低（p < 0.05）。G3组和G4组铝离子浓度显著升高（p < 0.05）。SEM分析显示，G2、G3和G4组腐蚀特征增加。
EDS分析表明，对照组和G1组的化学成分未发生改变。G2组铝离子含量降低。G3组和G4组铝浓度升高。浸泡在人工唾液和Máxima Proteção Anticáries®牙膏中未改变表面光洁度。Total 12®、Sensitive®和Branqueador®牙膏改变了表面光洁度。
