title: Microbiologically influenced corrosion of orthodontic metallic appliances.
abstract: Biocorrosion (microbiologically influenced corrosion; MIC) occur in aquatic habitats varying in nutrient content, temperature, stress and pH. The oral environment of organisms, including humans, should be one of the most hospitable for MIC. Corrosion of metallic appliances in the oral region is one cause of metal allergy in patients. In this study, an inductively coupled plasma-optical emission spectrometer revealed elution of Fe, Cr and Ni from stainless steel (SUS) appliances incubated with oral bacteria. Three-dimensional laser confocal microscopy also revealed that oral bacterial culture promoted increased surface roughness and corrosion pits in SUS appliances. The pH of the supernatant was lowered after co-culture of appliances and oral bacteria in any combinations, but not reached at the level of depassivation pH of their metallic materials. This study showed that Streptococcus mutans and Streptococcus sanguinis which easily created biofilm on the surfaces of teeth and appliances, did corrode orthodontic SUS appliances.
authors.affiliation: Department of Orthodontics, The Nippon Dental University, School of Life Dentistry at Niigata.
authors.forename: Takashi
authors.initials: T
authors.lastname: Kameda
authors.forename: Hirotake
authors.initials: H
authors.lastname: Oda
authors.forename: Kazuo
authors.initials: K
authors.lastname: Ohkuma
authors.forename: Natsuki
authors.initials: N
authors.lastname: Sano
authors.forename: Nomintsetseg
authors.initials: N
authors.lastname: Batbayar
authors.forename: Yukari
authors.initials: Y
authors.lastname: Terashima
authors.forename: Soh
authors.initials: S
authors.lastname: Sato
authors.forename: Kazuto
authors.initials: K
authors.lastname: Terada
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D003343:Corrosion; D006801:Humans; D008670:Metals; D009055:Mouth / Q000382:microbiology; D009967:Orthodontic Appliances
chemical_list: D008670:Metals