title: In Vitro evaluation of Enterococcus faecalis adhesion on various endodontic medicaments.
abstract: E. faecalis in endodontic infection represents a biofilm type of disease, which explains the bacteria's resistance to various antimicrobial compounds and the subsequent failure after endodontic treatment. The purpose of this study was to compare antimicrobial activities and bacteria kinetic adhesion in vitro for three endodontic medicaments with a clinical isolate of E. faecalis. We devised a shake culture which contained the following intracanalar preparations: CPD, Endoidrox (EIX), PulpCanalSealer (PCS); these were immersed in a liquid culture medium inoculated with the microorganism. The shake system velocity was able to prevent non-specific bacteria adhesion and simulated the salivary flow. Specimens were collected daily (from both the medium and medicaments) for 10 days; the viable cells were counted by plate count, while the adhesion index AI ° [E. faecalis fg DNA] /mm² was evaluated in the pastes after DNA extraction, by quantitative real time PCR for the 16S rRNA gene. A partial growth inhibition, during the first 24 hours, was observed in the liquid medium and on the medicaments for EIX and subsequently for CPD (six logs). EIX showed the lowest adhesion coefficient (5*10² [fg DNA]/mm²) for nine days and was similar to the control. PCS showed no antimicrobial/antibiofilm properties. This showed that "calcium oxide" base compounds could be active against biofilm progression and at least in the short term (2-4 days) on E. faecalis cells growing in planktonic cultures.
authors: Oral Biotechnology Laboratory (OBL), Dipartimento di Chirurgia e Scienze Odontostomatologiche, Universita' Degli Studi di Cagliari, Cagliari, Italy.
authors: Gloria
authors: G
authors: Denotti
authors: Rosaria
authors: R
authors: Piga
authors: Caterina
authors: C
authors: Montaldo
authors: Matteo
authors: M
authors: Erriu
authors: Francesca
authors: F
authors: Pilia
authors: Alessandra
authors: A
authors: Piras
authors: Massimo De
authors: MD
authors: Luca
authors: Germano
authors: G
authors: Orrù