Wietzikoski Lovato EC, et al. - The antibacterial impact of high-frequency equipment (HFE) on standard cultures of bacteria was assessed by the authors. They used the HFE flashing technique at intensities of 6, 8 and 10 mA for 30, 60, 90, 120 and 180 seconds. A significant bacterial growth reduction occurred at the intensity of 8 mA after 120 and 180 seconds for the E. aerogenes. For S. aureus, there was a strong bacterial growth inhibition at all intensities used. Time-dependent antibacterial effects of HFE were noted against E. aerogenes and S. aureus bacteria that have several resistance mechanisms.