Felipucci Daniela Nair Borges, Davi Letícia Resende, Paranhos Helena Freitas Oliveira, Bezzon Osvaldo Luiz, Silva Rodrigo Ferreira, Pagnano Valéria Oliveira
Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Braz Dent J. 2011;22(5):392-7. doi: 10.1590/s0103-64402011000500008.
Removable partial dentures (RPD) demand specific hygienic cleaning and the combination of brushing with immersion in chemical solutions has been the most recommended method for control of biofilm. However, the effect of the cleansers on metallic components has not been widely investigated. This study evaluated the effect of different cleansers on the surface of RPD. Five disc specimens (12 mm x 3 mm metallic disc centered in a 38 x 18 x 4 mm mould filled with resin) were obtained for each experimental situation: 6 solutions [Periogard (PE), Cepacol (CE), Corega Tabs (CT), Medical Interporous (MI), Polident (PO), 0.05% sodium hypochlorite (NaOCl), and distilled water (DW) control] and 2 Co-Cr alloys [DeguDent (DD) and VeraPDI (VPDI)] were used for each experimental situation. A 180-day immersion was simulated and the measurements of roughness (Ra, µm) of metal and resin were analyzed using 2-way ANOVA and Tukey's test. The surface changes and tarnishes were examined with a scanning electronic microscopy (SEM). In addition, energy dispersive x-ray spectrometry (EDS) analysis was carried out at representative areas. Visually, NaOCl and MI specimens presented surface tarnishes. The roughness of materials was not affected by the solutions (p>0.05). SEM images showed that NaOCl and MI provided surface changes. EDS analysis revealed the presence of oxygen for specimens in contact with both MI and NaOCl solutions, which might suggest that the two solutions promoted the oxidation of the surfaces, thus leading to spot corrosion. Within the limitations of this study, it may be concluded that the NaOCl and MI may not be suitable for cleaning of RPD.
可摘局部义齿（RPD）需要特定的卫生清洁方法，刷牙与浸泡在化学溶液中的联合使用一直是控制生物膜最推荐的方法。然而，清洁剂对金属部件的影响尚未得到广泛研究。本研究评估了不同清洁剂对RPD表面的影响。针对每种实验情况制备了五个圆盘试样（12毫米×3毫米的金属圆盘，位于填充树脂的38×18×4毫米模具中心）：6种溶液[派丽奥（PE）、西吡氯铵（CE）、固齿健片（CT）、医之选（MI）、保丽净（PO）、0.05%次氯酸钠（NaOCl）和蒸馏水（DW）对照]以及2种钴铬合金[迪古泰（DD）和维拉PDI（VPDI）]用于每种实验情况。模拟180天的浸泡，使用双向方差分析和Tukey检验分析金属和树脂的粗糙度（Ra，微米）测量值。用扫描电子显微镜（SEM）检查表面变化和变色情况。此外，在代表性区域进行能量色散X射线光谱（EDS）分析。肉眼可见，NaOCl和MI试样出现表面变色。溶液对材料的粗糙度没有影响（p>0.05）。SEM图像显示NaOCl和MI导致了表面变化。EDS分析表明，与MI和NaOCl溶液接触的试样中存在氧，这可能表明这两种溶液促进了表面氧化，从而导致点蚀。在本研究的局限性范围内，可以得出结论，NaOCl和MI可能不适合用于清洁RPD。
