Statement of problem

A vinegar-hydrogen peroxide mixture has been reported to be effective in eliminating Candida albicans and Staphylococcus aureus from acrylic resin, and its action has been reported to be comparable with that of sodium hypochlorite or peracetic acid. However, the effects of this mixture on cobalt-chromium alloys remain unknown.

Purpose

The purpose of this in vitro study was to evaluate the surface roughness, Knoop microhardness, surface free energy, and wettability of a cobalt-chromium alloy when exposed to a vinegar-hydrogen peroxide mixture.

Material and methods

Fifty specimens of cobalt-chromium alloy were fabricated and immersed for 900 minutes, simulating 3 months of a daily 10-minute immersion in the following chemical agents (n=10): distilled water (W); 0.5% sodium hypochlorite (H); 3% hydrogen peroxide and water dilution in 1:1 ratio (HP); white-wine vinegar and water dilution in 1:1 ratio (V); and vinegar and hydrogen peroxide mixture in 1:1 ratio (VHP). Surface roughness, Knoop microhardness, surface free energy, and wettability were measured with single blinding before and after immersions. Data were statistically analyzed by using 2-way repeated measures ANOVA (α=.05).

Results

The vinegar-hydrogen peroxide mixture did not affect the surface roughness or Knoop microhardness. However, 0.5% sodium hypochlorite significantly increased the roughness and decreased microhardness. Surface free energy and wettability increased after immersions, regardless of the types of solution.

Conclusions

Immersion in a vinegar-hydrogen peroxide mixture did not affect the surface characteristics of a cobalt-chromium alloy.

中文翻译：

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醋-过氧化氢混合物对钴铬合金表面性能的影响：可摘局部义齿的一种可能消毒剂

问题陈述

据报道，醋-过氧化氢混合物可有效消除丙烯酸树脂中的白色念珠菌和金黄色葡萄球菌，据报道其作用与次氯酸钠或过乙酸的作用相当。然而，这种混合物对钴铬合金的影响仍然未知。

目的

这项体外研究的目的是评估钴铬合金暴露于醋-过氧化氢混合物时的表面粗糙度、努氏显微硬度、表面自由能和润湿性。

材料与方法

制造了 50 个钴铬合金样品并浸泡 900 分钟，模拟每天浸泡 10 分钟以下化学试剂 (n=10) 的 3 个月：蒸馏水 (W)；0.5% 次氯酸钠 (H); 3% 过氧化氢和水以 1:1 的比例稀释 (HP)；白葡萄酒醋和水以 1:1 的比例稀释 (V)；以及 1:1 比例的醋和过氧化氢混合物 (VHP)。表面粗糙度、努氏显微硬度、表面自由能和润湿性在浸泡前后用单盲法测量。通过使用 2 路重复测量 ANOVA (α=.05) 对数据进行统计分析。

结果

醋-过氧化氢混合物不影响表面粗糙度或努氏显微硬度。然而，0.5%次氯酸钠显着增加了粗糙度并降低了显微硬度。无论溶液的类型如何，浸泡后表面自由能和润湿性都会增加。

结论

浸入醋-过氧化氢混合物中不会影响钴铬合金的表面特性。