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Efficacy of a Low Dose of Hydrogen Peroxide (Peroxy Ag + ) for Continuous Treatment of Dental Unit Water Lines: Challenge Test with Legionella pneumophila Serogroup 1 in a Simulated Dental Unit Waterline

Author

Listed:
  • Savina Ditommaso

    (Department of Public Health and Pediatrics, University of Turin, Turin 10126, Italy)

  • Monica Giacomuzzi

    (Department of Public Health and Pediatrics, University of Turin, Turin 10126, Italy)

  • Elisa Ricciardi

    (Department of Public Health and Pediatrics, University of Turin, Turin 10126, Italy)

  • Carla M. Zotti

    (Department of Public Health and Pediatrics, University of Turin, Turin 10126, Italy)

Abstract

This study was designed to examine the in vitro bactericidal activity of hydrogen peroxide against Legionella . We tested hydrogen peroxide (Peroxy Ag + ) at 600 ppm to evaluate Legionella survival in a simulated dental treatment water system equipped with Water Hygienization Equipment (W.H.E.) device that was artificially contaminated. When Legionella pneumophila serogroup (sg) 1 was exposed to Peroxy Ag + for 60 min we obtained a two decimal log reduction. High antimicrobial efficacy was obtained with extended periods of exposure: four decimal log reduction at 75 min and five decimal log reduction at 15 h of exposure. Involving a simulation device (Peroxy Ag + is flushed into the simulation dental unit waterlines (DUWL)) we obtained an average reduction of 85% of Legionella load. The product is effective in reducing the number of Legionella cells after 75 min of contact time (99.997%) in the simulator device under test conditions. The Peroxy Ag + treatment is safe for continuous use in the dental water supply system (i.e., it is safe for patient contact), so it could be used as a preventive option, and it may be useful in long-term treatments, alone or coupled with a daily or periodic shock treatment.

Suggested Citation

  • Savina Ditommaso & Monica Giacomuzzi & Elisa Ricciardi & Carla M. Zotti, 2016. "Efficacy of a Low Dose of Hydrogen Peroxide (Peroxy Ag + ) for Continuous Treatment of Dental Unit Water Lines: Challenge Test with Legionella pneumophila Serogroup 1 in a Simulated Dental Unit Waterl," IJERPH, MDPI, vol. 13(7), pages 1-10, July.
    • Handle: RePEc:gam:jijerp:v:13:y:2016:i:7:p:745-:d:74564
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    References listed on IDEAS

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    1. Savina Ditommaso & Monica Giacomuzzi & Elisa Ricciardi & Carla M. Zotti, 2016. "Cultural and Molecular Evidence of Legionella spp. Colonization in Dental Unit Waterlines: Which Is the Best Method for Risk Assessment?," IJERPH, MDPI, vol. 13(2), pages 1-10, February.
    2. Erica Leoni & Laura Dallolio & Francesca Stagni & Tiziana Sanna & Giovanni D'Alessandro & Gabriela Piana, 2015. "Impact of a Risk Management Plan on Legionella Contamination of Dental Unit Water," IJERPH, MDPI, vol. 12(3), pages 1-15, February.
    3. Laura Dallolio & Amalia Scuderi & Maria S. Rini & Sabrina Valente & Patrizia Farruggia & Maria A. Bucci Sabattini & Gianandrea Pasquinelli & Anna Acacci & Greta Roncarati & Erica Leoni, 2014. "Effect of Different Disinfection Protocols on Microbial and Biofilm Contamination of Dental Unit Waterlines in Community Dental Practices," IJERPH, MDPI, vol. 11(2), pages 1-13, February.
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    Cited by:

    1. Maria Antoniadou & Anestis Intzes & Christos Kladouchas & Iliana Christou & Stavroula Chatzigeorgiou & Martha Plexida & Valantis Stefanidakis & Ioannis Tzoutzas, 2023. "Factors Affecting Water Quality and Sustainability in Dental Practices in Greece," Sustainability, MDPI, vol. 15(11), pages 1-23, June.
    2. Alexandre Baudet & Julie Lizon & Jean-Marc Martrette & Frédéric Camelot & Arnaud Florentin & Céline Clément, 2020. "Efficacy of BRS ® and Alpron ® /Bilpron ® Disinfectants for Dental Unit Waterlines: A Six-Year Study," IJERPH, MDPI, vol. 17(8), pages 1-9, April.

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