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Corrosion Response of Ti6Al4V and Ti15Mo Dental Implant Alloys in the Presence of Listerine Oral Rinse

DOI: 10.1155/2013/739841

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The influence of a commonly used antibacterial mouth rinse, Listerine, on the corrosion behavior of one of the commonly used titanium alloys Ti6Al4V (two-phase structure, i.e., α and β) and a newer Ti15Mo (single β phase) in normal saline solution has been investigated using electrochemical techniques. Interfacial electrochemical changes occurring at the oxide-solution interface have been analysed using EIS circuit modeling. Listerine acts as a corrosion inhibitor for Ti15Mo alloy and a corrosion promoter for Ti6Al4V alloy. 1. Introduction Listerine is a commonly used mouth rinse with antiplaque, anticaries, and antibacterial properties. It is used in several dental applications following periodontal procedures and routine oral prophylaxis. It was awarded the American Dental Association’s seal of recognition in 1987 for its clinical efficacy in plaque control and gingival improvement [1]. Listerine antiseptic, developed by Warner-Lambert, was the first over-the-counter mouth rinse [2]. Listerine contains different essential oils, which are phenolics such as thymol, eucalyptol, menthol, and methyl salicylate and are known to retard plaque buildup and reduce gingivitis [3–10]. Thymol, eucalyptol, and menthol are known to possess proven antibacterial activity and are found in thyme (Thymus vulgaris), eucalyptus (Eucalyptus globulus), and peppermint (Mentha piperita), respectively. Methyl salicylate has anti-inflammatory activity and is found in meadowsweet (Filipendula ulmaria) and willow (Salix spp.) [2]. The effect of Listerine on plaque was ascribed to its bactericidal properties related to the alteration of bacterial cell wall, which has been well documented in vitro and in vivo [11–15]. A newly inserted prosthesis and various surrounding tissues may get exposed to Listerine from minutes to days, depending upon the therapy performed and the local and systemic patient factors. It is thus important to understand the effect of Listerine on the electrochemical and corrosion behavior of titanium alloys in order to predict treatment prognosis. Cestarolli et al. [16] have compared the effect of mouthwashes including Listerine and a simulated body fluid on the corrosion behavior of an Fe-Cr-Ni alloy. The corrosion resistance of this alloy was the highest in the presence of Listerine mouthwash. However, the present study simulates the use of Listerine as an oral prophylactic rinse, in other words, the condition when the concentration of saliva gets altered due to the presence of Listerine in the mouth. The effect of this normal saline-Listerine solution has,


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