Dental unit waterline testing practices: an 11-Year retrospective study.
Juan M Buitrago1, Rob J Kolbe1, Michelle F Siqueira2
1College of Dentistry, University of Saskatchewan, Saskatoon, SK, Canada.
BMC Oral Health
|November 16, 2023
Summary
Dental clinics often fail to retest and adequately address contaminated dental unit waterlines (DUWLs) after initial high microbial counts are detected. This highlights a need for improved water quality monitoring and intervention strategies in dental practices.
Area of Science:
- Microbiology
- Infection Control
- Public Health
Background:
- Dental unit waterlines (DUWLs) can harbor microbial contamination, posing a risk to patient and dental staff health.
- Maintaining safe water quality in dental settings is crucial for preventing healthcare-associated infections.
Purpose of the Study:
- To investigate dental clinic practices regarding DUWL testing in Saskatchewan over 11 years.
- To analyze clinic responses to identified high microbial levels in DUWLs.
Main Methods:
- A retrospective study analyzed 4,093 DUWL test results from 137 Saskatchewan dental clinics.
- Water samples from syringes, handpieces, and ultrasonic scalers were tested for heterotrophic plate counts (HPCs).
- Failures were defined as HPCs > 500 CFU/mL, with subsequent follow-up actions recorded.
Main Results:
- Overall, 21% of DUWL tests failed to meet acceptable microbial standards.
- A positive association was observed between testing frequency and failure rates (r=0.52, p<0.001).
- Only 7% of failed tests were followed by retesting within two weeks, and 47% of these remained non-compliant.
Conclusions:
- Infrequent retesting and inadequate interventions are common after DUWL failures.
- There is a need for enhanced regulatory and educational initiatives to improve dental water quality.
- Consistent DUWL monitoring and evidence-based interventions are essential for patient safety.
