J. Mater. Sci. Technol. ›› 2022, Vol. 128: 118-132.DOI: 10.1016/j.jmst.2022.04.012

• Research Article • Previous Articles     Next Articles

Oral microbiota accelerates corrosion of 316L stainless steel for orthodontic applications

Wang Qingfua,d,1, Zhang Mingxingb,c,1, Yang Chuntianb,c, Yang Yib,c, Zhou Enzeb,c, Liu Panb,c, Jin Daiqianga, Xu Dakeb,c,*(), Wu Lina,*(), Wang Fuhuib,c   

  1. aSchool and Hospital of Stomatology, China Medical University, Liaoning Provincial Key Laboratory of Oral Diseases, Shenyang 110001, China
    bShenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
    cElectrobiomaterials Institute, Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
    dDepartment of Oral Implantology, Tianjin Stomatological Hospital, School of Medicine, Nankai University & Tianjin Key Laboratory of Oral and Maxillofacial Function Reconstruction, Tianjin 300041, China
  • Received:2022-01-29 Revised:2022-03-23 Accepted:2022-04-06 Published:2022-11-20 Online:2022-11-22
  • Contact: Xu Dake,Wu Lin
  • About author:lwu@cmu.edu.cn (L. Wu).
    *E-mail addresses: xudake@mail.neu.edu.cn (D. Xu),
    First author contact:1These authors contributed equally to this work.

Abstract:

In this work, microbiologically influenced corrosion (MIC) of 316L stainless steel (SS) caused by oral microbiota was investigated with HOMINGS 16S rRNA gene sequencing technology, and electrochemical and surface analysis techniques. The results showed that oral microbiota from different subjects developed multi-species biofilms with significant differences in structure and composition of bacteria strains on the 316L SS coupons. In the presence of oral microbiota, more severe pitting corrosion and faster dissolution of metallic ions including Ni and Cr were observed. The biofilm considerably decreased the pitting potential of 316L SS from 1268.0 ± 29.1 mV vs. SCE (abiotic control) to less than 500 mV vs. SCE. The corrosion current density in the presence of oral microbiota from subject 1 (115.3 ± 83.3 nA cm−2) and subject 2 (184.4 ± 162.0 nA cm−2) was at least 4 times more than that in the abiotic medium (28.0 ± 2.3 nA cm−2). The electroactive microorganisms with the potential to facilitate corrosion via extracellular electron transfer found in oral microbiota may be mainly responsible for the accelerated corrosion.

Key words: Oral microbiota, Microbiologically influenced corrosion, Stainless steel, Electroactive microorganism