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This study aimed to evaluate the antibacterial action of KTP (potassium-titanyl-phosphate) laser irradiations (compared with 980nm diode laser), associated with conventional endodontic procedures, on Enterococcus faecalis biofilms. Fifty-six dental roots with single canals were prepared with Ni-Ti rotary instruments, autoclaved, inoculated with an E.faecalis suspension and incubated for 72h. They were randomly allocated to control and treatment groups. Laser parameters were as follows: power 2.5W, Ton 35ms, Toff 50ms (KTP laser); power 2.5W, Ton 30ms, Toff 30ms (980nm diode laser). To evaluate the residual bacterial load, BioTimer Assay was employed. The chemo-mechanical treatment together with laser irradiations (KTP and 980nm diode lasers) achieved a considerable reduction of bacterial load (higher than 96% and 93%, respectively). Regarding both laser systems, comparisons with conventional endodontic procedures (mortality rate of about 67%) revealed statistically highly significant differences (P≤0.01). This study confirms that laser systems can provide an additional aid in endodontic disinfection. © 2014 Australian Society of Endodontology.

Effectiveness of KTP laser versus 980nm diode laser to kill Enterococcus faecalis in biofilms developed in experimentally infected root canals / Romeo, Umberto; Palaia, Gaspare; Alessia, Nardo; Tenore, Gianluca; Vito, Telesca; Roly, Kornblit; Alessandro Del, Vecchio; Frioni, Alessandra; Valenti, Piera; Berlutti, Francesca. - In: AUSTRALIAN ENDODONTIC JOURNAL. - ISSN 1329-1947. - STAMPA. - Mar 3(2014). [10.1111/aej.12057]

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