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Aim . To compare the disinfection effect of Er,Cr:YSGG laser using radial firing tips with NaOCI in root canals infected with  C. albicans  and to evaluate the irradiation effect on the dentinal surfaces.  Material and Methods . In total seventy-six mandibular premolar teeth were used. In order to standardize the incubation and sterilization procedure, eight teeth were used. Sixty-eight of the root canals were incubated with  C. albicans  suspension for 72 hours. The specimens were divided into 5 experimental groups. Two groups were constituted as Group 1 was irradiated with 1.5 W laser ( n  = 8) and group 2, which was irradiated with 2 W laser ( n  = 8). Two more groups were formed as Group 3 (2 W laser ( n  = 25) and Group 4 NaOCI (5%) ( n  = 25). Group 5 ( n  = 2) did not receive any treatment. Mann-Whitney  U  and Kruskal-Wallis  H  tests were used to compare the different laser output powers. Wilcoxon Signed Ranks Test was used in order to compare the  Candida  cfu/ml levels according to treatment protocols ( P  < 0.05).  Results . Both 1.5 W and 2 W laser resulted in a major reduction of  C. albicans  without a significant difference. The comparison of the dentin surfaces irradiated with Er,Cr:YSGG laser at two power settings resulted in similar morphological changes. However, NaOCI was found to be more effective in reduction of  C. albicans  than 2 W laser application.  Conclusion . According to the results of the present study, the Er,Cr:YSGG laser with radial firing tips presented less antifungal effects on  C. albicans  in root canals of infected teeth than NaOCl solution.

Effect of Er,Cr:YSGG Laser Irradiation with Radial Firing Tips onCandida albicansin Experimentally Infected Root Canals