摘要
316L stainless steel(SS)is widely applied as microimplant anchorage(MIA)due to its excellent mechanical properties.However,the risk that the oral microorganisms can corrode 316L SS is fully neglected.Microbiologically influenced corrosion(MIC)of 316L SS is essential to the health and safety of all patients because the accelerated corrosion caused by the oral microbiota can trigger the release of Cr and Ni ions.This study investigated the corrosion behavior and mechanism of subgingival microbiota on 316L SS by 16S rRNA and metagenome sequencing,electrochemical measurements,and surface characterization techniques.Multispecies biofilms were formed by the oral subgingival microbiota in the simulated oral anaerobic environment on 316L SS surfaces,significantly accelerating the corrosion in the form of pitting.The microbiota samples collected from the subjects differed in biofilm compositions,corrosion behaviors,and mechanisms.The oral subgingival microbiota contributed to the accelerated corrosion of 316L SS via acidic metabolites and extracellular electron transfer.Our findings provide a new insight into the underlying mechanisms of oral microbial corrosion and guide the design of oral microbial corrosion-resistant materials.
基金
supported by grants from the National Key Research and Development Program of China(2020YFA0907300)
the National Natural Science Foundation of China(Nos.U2006219 and 51871050)
the Fundamental Research Funds for the Central Universities(Nos.N180203019 and N2002019)
Liaoning Revitalization Talents Program(No.XLYC1907158)
Basic Scientific Research Project of Education Department of Liaoning Province and Shenyang Young and middle-aged Scientific and Technological Innovation Talents Support Program(RC210001).
