Bacterial Contamination of Endodontic Materials before and after Clinical Storage

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)
252 Downloads (Pure)


Introduction The aim of this study was to evaluate the bacterial contamination in endodontic consumables (gutta-percha points, rubber dams, paper mixing pads, caulking agents, and endodontic instrument sponges [EISs]) before and after clinical use and storage. Methods Materials were randomly sampled in triplicates at 3 time points (t0, at package opening; t1, at 7 days; and t2, at 14 days) during their clinical usage. The gutta-percha points and caulking agent (25 mg) were added to 1 mL phosphate-buffered saline (PBS). The rubber dam, paper mixing pad, and EIS were added to 25 mL PBS. After vortexing, centrifuging, and removing the supernatant, the pellet was resuspended in 1 mL PBS, plated on fastidious anaerobic agar, and incubated aerobically and anaerobically. The grown colonies were identified by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The total bacterial load was calculated in the remaining volume (800 μL) from each sample by quantitative polymerase chain reaction after DNA extraction. Results All tested materials showed a varied number of contaminated samples at the 3 time points (except EIS at t0) using MALDI-TOF MS. The most isolated genera were Propionibacterium (42%) and Staphylococcus (32%). By using non–culture-based approaches, all tested materials at the 3 time points (except gutta-percha at t0 and the caulking agent at t0, t1, and t2) carried bacterial DNA. Conclusions The majority of the tested materials harbored bacteria in their samples before and after clinical storage. Nosocomial infection derived from commonly used consumables could have an impact on the outcome of endodontic treatment.
Original languageEnglish
Pages (from-to)1852-1856
Number of pages5
Issue number11
Early online date23 Sept 2017
Publication statusPublished - Nov 2017


  • Bacterial contamination
  • clinical storage
  • endodontic materials
  • matrix-associated laser desorption/ionization time-of-flight mass spectrometry
  • quantitative polymerase chain reaction


Dive into the research topics of 'Bacterial Contamination of Endodontic Materials before and after Clinical Storage'. Together they form a unique fingerprint.

Cite this