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.

Intraoral electric potential <i>via</i> oral bacterial power generation —A novel mechanism of biofilm formation

“…Taking into consideration the results of smartphone-induced IoP/BsP, oral conditions could influence IoP, rather than IoP influencing the oral conditions. These causal relationships could be involved in a mechanism similar to the oxidation-reduction potential of oral bacterial flora in the process of microbiologically influenced corrosion 32) and MFC 25) . In this study, the participants were a relatively uniform group.…”

The influence of oxygen amount in oral cavity media on the corrosion behavior of nanostructures formed on anodized Zr

“…Also under aerobic bacteria colonies, the metal surface will be an anode, under the anaerobic colonies, a cathode. This can lead to loosening and dysfunction of implants . In this context materials such as zirconia with lower ability in the microbial colonization has great potential for prosthetic rehabilitation and zirconium anodizing leading to nanostructures is worthy of investigation as an alternative versus titanium in tooth restoration.…”

Corrosion of dental alloys in artificial saliva with Streptococcus mutans

“…mutans ) and Streptococcus sanguinis species (which easily created biofilms on teeth surfaces) were able to corrode various orthodontic SUS appliances [12]. …”