[Comparison of antimicrobial activity of Er,Cr: YSGG laser and ultrasonic irrigation in root canal disinfection].

The aim of this study was to compare the antimicrobial activity of Er,Cr:YSGG laser and ultrasonic irrigation in root canal disinfection.Sixty decayed teeth requiring root canal therapy were divided into 3 groups randomly: Er,Cr:YSGG laser group, ultrasonic irrigation group and control group, 20 in each group. The bacteria in each group were incubated and counted before and after root canal treatment. Statistical analysis was performed using SPSS 19.0 software package.In the 3 groups, the number of bacteria in root canals was reduced significantly after root canal treatment (P<0.05). The number of bacteria in Er,Cr:YSGG laser group and ultrasonic irrigation group decreased significantly greater than the control group (P<0.05), but the Er,Cr:YSGG laser group and ultrasonic irrigation group had no significant difference(P>0.05).After root canal treatment, the number of bacteria in the root canal is obviously reduced. The antimicrobial activity of three intercanal methods on bacteria in root canals is profound. The reduction of bacteria is more obvious after treatment of Er,Cr:YSGG laser and ultrasonic irrigation than the control.