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ORIGINAL ARTICLE
Year : 2020  |  Volume : 23  |  Issue : 9  |  Page : 1188-1193

Antimicrobial effects of sodium hypochlorite and Er,Cr:YSGG laser against Enterococcus faecalis biofilm


1 Department of Infectious, Near East University, Faculty of Medicine, Diseases and Clinical Microbiology, Nicosia, Cyprus
2 DentX Dental Hospital, Near East University, Vocational School of Health Services, Nicosia, Cyprus
3 Department of Microbiology, Near East University, Vocational School of Health Services, Nicosia, Cyprus

Correspondence Address:
Dr. M Guvenir
Department of MIcrobiology, Near East University, Vocational of Health Services, Nicosia
Cyprus
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/njcp.njcp_632_18

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Aims: The aim of this study was to investigate the antimicrobial effect of Erbium, chromium-doped yttrium, scandium, gallium, and garnet (Er,Cr:YSGG) laser with and without NaOCl solution. A total of 81 extracted human mandibular premolar teeth were used. Materials and Methods: After root canal preparation and sterilization, the samples were inoculated with E. faecalis for 24 hours. The specimens were divided into 4 experimental groups. Group 1 (n = 25) was irradiated with 2 W laser, group 2 (n = 25) was irradiated with 0.75 W laser in combination with 2.5% NaOCl, group 3 (n = 25) was irrigated with 5% NaOCl and group 4 (n = 6) was not treated. Statistical analysis was performed by using Wilcoxon Signed Ranks, Mann-Whitney U and Kruskal-Wallis H tests. Results: The combination of 0.75 W laser with 2.5% NaOCl regime was found to be just as effective at inhibiting the growth of E. faecalis and sterilization of all root canals as 5% NaOCl irrigation (P > 0.001). The 2 W laser had significant bactericidal effect in infected root canals however it did not eradicate all bacteria. The SEM observations were in accordance with the microbiologic findings. Conclusions: Within the limitations of this laboratory study, NaOCl irrigation improved the antimicrobial effect of Er,Cr:YSGG laser irradiation. When the toxic effects of high percentage of NaOCl was considered, the combination of low-powered laser and low concentration of NaOCl can be used as an effective disinfection method in root canal treatment.


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