Related Experiment Videos
Residual protein levels on reprocessed dental instruments
1Infection Research Group, Glasgow Dental Hospital and School, 378 Sauchiehall Street, Glasgow G2 3JZ, Scotland, UK. a.smith@dental.gla.ac.uk
The Journal of Hospital Infection
|July 9, 2005
Summary
Thorough cleaning of endodontic files is crucial to prevent iatrogenic Creutzfeldt-Jakob disease transmission. Studies show most cleaned endodontic files retain visible debris and residual protein, indicating incomplete reprocessing in dental practices.
Area of Science:
- Infection Control
- Dental Instrument Reprocessing
- Prion Disease Prevention
Background:
- Iatrogenic Creutzfeldt-Jakob disease (iCJD) transmission risk is linked to bioburden on medical instruments.
- Endodontic files contact neural tissue, posing a contamination risk with prion proteins.
- Effective cleaning before sterilization is vital for patient safety.
Purpose of the Study:
- To evaluate the effectiveness of current endodontic file cleaning methods in dental practices.
- To quantify residual protein and visible debris on reprocessed endodontic files.
- To assess the potential for cross-infection from inadequately cleaned instruments.
Main Methods:
- Assessment of cleaning protocols across 22 dental practices.
- Visual inspection for debris on 220 used endodontic files under microscopy.
- Quantification of residual protein using a fluorescent assay (o-phthaldialdehyde/N-acetyl cysteine).
Main Results:
- Significant variation observed in endodontic file cleaning techniques among dental practices.
- Visible debris detected on 98% of examined endodontic files.
- Residual protein found on all files, with a median of 5.4 microg (range: 0.5-63.2 microg).
Conclusions:
- Current endodontic file cleaning practices in primary dental care are often insufficient.
- Reprocessed endodontic files may harbor residual contaminants, posing a cross-infection risk.
- Incomplete cleaning necessitates improved protocols to mitigate iCJD transmission risks.