title: Behavior of NiTi in the presence of oral bacteria: corrosion by Streptococcus mutans.
abstract: The aim of this study was to investigate the electrochemical behavior of nickel titanium (NiTi) orthodontic wires in a solution containing Streptococcus mutans oral bacteria. In this article, we explain our choice of bacterial species before describing the culture process in artificial saliva and the precautions needed to prevent contamination by other bacteria. The electrochemical behavior of the alloy (NiTi) was analyzed electrochemically in Ringer sterile artificial saliva and in artificial saliva enriched with a sterile broth and modified by addition of bacteria. The electrochemical procedures chosen for this study were: free corrosion potential, potentiodynamic curves and impedance spectroscopy. In this way, we were able to show that the free corrosion potential of the NiTi in the Ringer solution increases with time and then stabilizes, thus passivating the alloy. We also demonstrated that colonization of the metal surface by bacteria triggered a drop in the free corrosion potential. The electrochemical impedance findings revealed no significant difference in NiTi behavior between the two media. Finally, we observed a slight difference between the two corrosion currents in favor of the bacteria-enriched solution, in which the NiTi underwent greater corrosion. These findings demonstrate the impact of acidogenic bacteria on corrosion behavior of the NiTi wires investigated. However, further research is required, notably incorporating longer immersion times in the two media.
authors.affiliation: Faculté de médecine dentaire de Rabat, université Mohamed V Souissi, Rabat, Morocco. bahijeloubna@yahoo.fr
authors.forename: Loubna
authors.initials: L
authors.lastname: Bahije
authors.forename: Hicham
authors.initials: H
authors.lastname: Benyahia
authors.forename: Sakina
authors.initials: S
authors.lastname: El Hamzaoui
authors.forename: Mohamed
authors.initials: M
authors.lastname: Ebn Touhami
authors.forename: Rachid
authors.initials: R
authors.lastname: Bengueddour
authors.forename: Wiam
authors.initials: W
authors.lastname: Rerhrhaye
authors.forename: Faïza
authors.initials: F
authors.lastname: Abdallaoui
authors.forename: Fatima
authors.initials: F
authors.lastname: Zaoui
mesh_terms: D003343:Corrosion; D003470:Culture Media / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003773:Dental Plaque / Q000382:microbiology*; D058266:Dielectric Spectroscopy; D017097:Electric Impedance; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D009532:Nickel / Q000737:chemistry*; D009969:Orthodontic Wires / Q000382:microbiology*; D012464:Saliva, Artificial / Q000737:chemistry; D013295:Streptococcus mutans / Q000737:chemistry* / Q000302:isolation & purification; D014025:Titanium / Q000737:chemistry*
chemical_list: D003470:Culture Media; D003722:Dental Alloys; D012464:Saliva, Artificial; C040654:titanium nickelide; D009532:Nickel; D014025:Titanium