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September 5, 2026HygieneOpen Access

Evaluation of Microbial Contamination and Practical Effectiveness of Chemical Disinfection in Dental Unit Waterlines Supplied with Reverse Osmosis Water: A Sequential and Non-Randomized Study

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Authors

MWMeixia WangQSQingfeng ShiWYWanpei Yao

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Overview

Sequential longitudinal study demonstrates continuous slightly acidic electrolyzed water sustains microbial control in reverse osmosis dental waterlines, highlighting the inadequacy of purified...

Key Points

  • To evaluate microbial contamination in reverse osmosis-supplied dental unit waterlines and determine the real-world effectiveness of shock versus continuous chemical disinfection protocols.
  • Conducted a single-center, sequential longitudinal study monitoring 15 dental chairs and 60 terminal outlets supplied with reverse osmosis water.
  • Sequentially implemented chlorine-based shock disinfection followed by continuous disinfection using slightly acidic electrolyzed water (SAEW).
  • Measured heterotrophic plate counts (HPCs) via R2A culture and characterized microbial communities in 12 water samples using metagenomic next-generation sequencing (mNGS).
  • Prior to disinfection, 73.33% of terminal outlet samples exceeded the safety threshold (500 CFU/mL) with a median HPC of 805 CFU/mL, and mNGS identified Legionella pneumophila, Pseudomonas aeruginosa, and Acanthamoeba.
  • Chlorine-based shock disinfection achieved 100% immediate compliance, but 73.33% of outlets exceeded the contamination threshold again by week 5 (median HPC: 600 CFU/mL).
  • Continuous SAEW disinfection sustained microbial suppression over 55 weeks, yielding an overall threshold exceedance rate of 3.33% and marked reductions in microbial abundance via mNGS.

Cite This Study

Wang et al. (2026) studied this question.

synapsesocial.com/papers/6a9bd4126b95aff0620eb72chttps://doi.org/10.3390/hygiene6030056
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Implementation and Preliminary Evaluation of a Low-Cost Sodium Hypochlorite Shock Disinfection Protocol for Dental Unit Waterlines2026
  2. 2Microbial Load and Antibiotic Resistance Patterns in Dental Unit Waterlines: Role of Routine Flushing and Systemic Factors2025 · 1 citations
  3. 3Comparison of the Efficacies of Disinfectants To Control Microbial Contamination in Dental Unit Water Systems in General Dental Practices across the European Union2006 · 82 citations
  4. 4Microbial contamination and biofilm-forming pathogens in dental unit waterlines: A cross- sectional study of opportunistic bacteria and infection control implications in an urban setting of China2025
  5. 5Bactericidal efficacy of electrochemically activated solutions for dental unit waterlines2025