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The aim of this work is to investigate the effects produced by polymicrobial biofilm (<i>Porphyromonas gingivalis</i>, <i>Streptococcus mutans</i>, <i>Streptococcus sanguinis</i>, and <i>Streptococcus salivarius</i>) on the corrosion behavior of titanium dental implants. Pure titanium disks were polished and coated with titanium nitride (TiN) and silicon carbide (SiC) along with their quarternized versions. Next, the disks were cultivated in culture medium (BHI) with <i>P. gingivalis</i>, <i>S. mutans</i>, <i>S. sanguinis</i>, and <i>S. salivarius</i> and incubated anaerobically at 37 °C for 30 days. Titanium corrosion was evaluated through surface observation using Scanning Electron Microscope (SEM) and Atomic Force Microscopy (AFM). Furthermore, the Ti release in the medium was evaluated by Inductively Coupled Plasma Mass Spectrometry (ICP-MS). SEM images showed that coated Ti disks exhibited lower corrosion compared to non-coated disks, except for the quartenized TiN. This was confirmed by AFM, where the roughness was higher in non-coated Ti disks. ICP showed that Ti levels were low in all coating disks. These results indicate that these SiC and TiN-based coatings could be a useful tool to reduce surface corrosion on titanium implant surfaces.