The effect of hydrogen peroxide/colloidal silver on reducing the colonization and growth of heterotrophic bacteria in dental unit waterlines

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Abstract

The objective of the present study was to investigate reduction in the colonization and growth of heterotrophic bacteria in dental unit waterlines by using hydrogen peroxide/colloidal silver as disinfectant. Twenty-seven dental units were included; 6 units that were more than 20 years old and 7 units that had been in use for 2 years comprised the old and new treatment groups, respectively. Fourteen units served as controls. The treatment groups were disinfected continuously and every 4 weeks shock doses were applied over a 20-week period. Water samples were taken before treatment, 1 and 2 weeks after treatment, and thereafter every 4 weeks; then they were inoculated onto R2A agar plates. While 1-16-week results for the old treatment group showed total heterotrophic bacterial counts of higher than 1 × 105 cfu/mL, at 20 weeks they were below 7.5 × 102 cfu/mL. Only 2 units were able to reach levels of ≤200 cfu/ mL, which is the dental unit water quality standard. For the new treatment group it was achieved for all units after 1 week. Electron microscopic analysis also revealed that while biofilm formation was more evident in the old treatment group, after a longer treatment period biofilms were eliminated completely. The findings indicate that disinfection was effective in improving the output water quality using hydrogen peroxide/colloidal silver disinfectant. © TÜBİTAK.

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Özalp, M., Bulut, Ö. E., Ataç, A. S., Ekizoǧlu, M., Kart, D., Çelik, H. H., & Tatar, I. (2013). The effect of hydrogen peroxide/colloidal silver on reducing the colonization and growth of heterotrophic bacteria in dental unit waterlines. Turkish Journal of Biology, 37(3), 336–341. https://doi.org/10.3906/biy-1204-23

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