Hindawi Publishing Corporation International Journal of Corrosion Volume 2013, Article ID 739841, 7 pages http://dx.doi.org/10.1155/2013/739841 Research Article Corrosion Response of Ti6Al4V and Ti15Mo Dental Implant Alloys in the Presence of Listerine Oral Rinse Rahul Bhola, 1 Charu Chandra, 2 Faisal M. Alabbas, 1,3 Sukumar Kundu, 1,4 Brajendra Mishra, 1 and David L. Olson 1 1 Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO 80401, USA 2 Department of Chemistry, University of Delhi, Delhi 110007, India 3 Department of Inspection, Saudi Aramco, Dhahran 31311, Saudi Arabia 4 Department of Metallurgy and Materials Engineering, Bengal Engineering and Science University, Shibpur, Howrah 711103, India Correspondence should be addressed to Rahul Bhola; bhola.rahul@gmail.com Received 18 July 2013; Accepted 7 October 2013 Academic Editor: Sebastian Feliu Copyright © 2013 Rahul Bhola et al. his is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. he inluence 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.,  and ) and a newer Ti15Mo (single  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 eicacy in plaque control and gingival improvement [1]. Listerine antiseptic, developed by Warner-Lambert, was the irst over-the-counter mouth rinse [2]. Listerine con- tains diferent 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]. hymol, eucalyptol, and menthol are known to possess proven antibacterial activity and are found in thyme (hymus vulgaris), eucalyptus (Eucalyptus globulus), and peppermint (Mentha piperita), respectively. Methyl salicylate has anti- inlammatory activity and is found in meadowsweet (Fil- ipendula ulmaria) and willow (Salix spp.) [2]. he efect 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 efect of Listerine on the electrochemical and corrosion behavior of titanium alloys in order to predict treatment prognosis. Cestarolli et al. [16] have compared the efect of mouthwashes including Listerine and a simulated body luid on the corrosion behavior of an Fe-Cr-Ni alloy. he corrosion resistance of this alloy was the highest in the presence of Lis- terine 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. he efect of this normal saline-Listerine solution has, thus, been explored on the behavior of titanium alloys when used as prostheses in patients. he conventional dental implants comprise the Ti6Al4V alloy but owing to its higher modulus of elasticity and thereby creating a greater modulus mismatch with the bone (stress shielding efect) newer beta alloys, Ti15Mo, with lower elastic modulus are being developed for use as implants in oral cavity.