Electrochemical study on microbiology‐related corrosion of metallic dental materials

Microbiology‐related corrosion has been noted in industry for many years. It is widely recognized that microorganisms affect the corrosion of metal and alloys immersed in aqueous environments. Under similar conditions, the effect of bacteria in the oral environment on the corrosion of dental metallic materials remains unknown. The purpose of this study is to investigate the corrosion behavior of dental metallic materials in the presence of Streptococcus mutans and its growth byproducts. Samples were commercially pure titanium (CPT), Ti‐6Al‐4V (TAV), Ti‐Ni (TN), Co‐Cr‐Mo alloy (CCM), 316L stainless steel (SSL), 17Cr‐4Ni PH‐type stainless steel (PH), and Ni‐Cr alloy (NC). Using Gamry corrosion test system, surfaces were exposed to (1) sterilized Ringer's solution as a control for (2), (2) S. mutans mixed with sterilized Ringer's solution; (3) sterilized tryptic soy broth as a control for (4), and (4) byproducts of S. mutans mixed with sterilized tryptic soy broth. Corrosion parameters (E_OCP, E_CORR, I_CORR, etc.) were corrected for all tested samples. Averaged values of these parameters were statistically analyzed by t‐test to identify significant differences. It was concluded that (1) S. mutans reduced the E_OCP of CPT, TAV, TN, and SSL, and the byproducts of S. mutans reduced the E_OCP of TAV, TN, SSL, and PH. (2) S. mutans increased the I_CORR of PH, and byproducts of S. mutans increased the I_CORR of all the samples. (3) S. mutans reduced the E_CORR of CPT, TAV and TN, and the byproducts of S. mutans reduced the E_CORR of TN, SSL, PH, and NC. (4) S. mutans increased the I_PASS of CPT, and the byproducts of S. mutans increased the I_PASS of CPT, PH, and NC.