Laser assisted irrigation and hand irrigation for root canal decontamination:a comparison

摘要

Aim:to compare the bactericidal efficiency of conventional method and LAI for root canal decontamination. Material and method:22 human single root teeth, extracted for periodontal problems, mechanically prepared up to ISO 25 at the working lenght were divided in 2 groups:after sterilization, the teeth were infected with enterococcus faecalis and incubated for 4 weeks. Group A:10 teeth were irrigated with conventional hand technique (CI):3ml of 5% NaClO were used for two times of 30s each and after washing with sterile bi-distilled water for 20s, a final irrigation was performed with 3ml of 17% EDTA. Group B:10 teeth were irrigated with 3ml of NaClO and activated by erbium laser, two cycles of 30s; also the final irrigation with 3ml of 17% EDTA was activated by erbium laser. In both the groups a resting time of 30s was used between the two sessions to allow the reaction rate of NaClO. The Erbium laser 2940 nm (LightWalker AT, Fotona; Lublijana, Slovenia) was used with 50microsecond pulse duration, at 15Hz, 20mJ, with a 600micron PIPS tip. Two samples were used as positive and negative control. Results:LAI technique used in this ex vivo study resulted in higher percentage of root canal bacterial reduction.