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KMID : 0361920170470050306
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Korean Journal of Orthodontics
2017 Volume.47 No. 5 p.306 ~ p.312
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The effect of fluoride-containing oral rinses on the corrosion resistance of titanium alloy (Ti-6Al-4V)
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Huang Gui Yue
Jiang Heng Bo
Cha Jung-Yul
Kim Kwang-Mahn
Hwang Chung-Ju
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Abstract
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Objective: The purpose of this study was to examine the effect of commerciallyavailable fluoride-containing oral rinses on the corrosion behavior of titaniumalloys, which are the main components of orthodontic miniscrews.
Methods:Four commercially available oral rinses (solution A, pH 4.46/260 ppm fluoride;solution B, pH 4.41/178 ppm fluoride; solution C, pH 6.30/117 ppm fluoride;and solution D, pH 4.17/3.92 ppm fluoride) were tested on titanium alloy (Ti-6Al-4V) circular plates, and saline was used as the control. The open-circuitpotential and potentiodynamic polarization of these materials were measured.Thereafter, all samples were evaluated under a field-emission scanning electronmicroscope.
Results: Among the tested oral rinses, except solution D, the morethe fluoride content was, the greater was the corrosion potential downtrend;the corrosion resistance of the titanium alloy sample was also loweredsignificantly (p < 0.05). Field-emission scanning electron microscopic analysisof the surface morphology of the titanium alloy samples revealed that allsamples had some defects, crevices, or pitting after exposure to the oral rinsesthan before treatment. In particular, the samples in solution A showed the mostchanges.
Conclusions: Commercially available oral rinses having a high fluorideconcentration and a low pH may reduce the corrosion resistance of titaniumalloys used in dental appliances such as orthodontic titanium miniscrews andbrackets.
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KEYWORD
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Corrosion resistance, Fluoride, Oral rinse, Titanium alloy
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