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Statistical modeling of dental unit water bacterial test kit performance
Mark E Cohen1, Jennifer A Harte, Mark E Stone
1Naval Institute for Dental and Biomedical Research Great Lakes, IL, USA. mark.cohen@med.navy.mil
The Journal of Clinical Dentistry
|May 19, 2007
Summary
Dental water test kits often undercount bacteria compared to the gold standard R2A method, especially at higher concentrations. One kit’s bias was estimable, but insensitivity to certain bacteria remains a concern.
Area of Science:
- Microbiology
- Dental Public Health
- Environmental Monitoring
Background:
- Monitoring dental unit water quality is crucial for infection control.
- The accuracy of in-office test kits compared to the gold standard R2A method is not well-established.
Purpose of the Study:
- To evaluate the accuracy of two in-office dental water test kits against the R2A method.
- To assess test kit performance across various bacterial types and concentrations.
Main Methods:
- Colony forming units (CFU) were enumerated using R2A and two test kits.
- Poisson regression analysis was employed to compare bacterial counts and assess device effects.
Main Results:
- Test kits exhibited over-dispersion at higher bacterial loads, unlike the R2A method.
- Both kits consistently undercounted bacteria relative to R2A.
- A specific pink-pigmented bacterium, Methylobacterium rhodesianum, was not detected by the test kits.
Conclusions:
- One test kit showed adequate reliability at higher bacterial counts, with adjustable undercount bias.
- The inability of test kits to detect certain bacteria like Methylobacterium spp. poses a significant challenge for accurate dental water monitoring.
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