Objective:To screen out the optimal degree of root canal preparation assisted by methylene blue light dynamic therapy for root canal disinfection.Methods:Enterococcus faecalis biofilm was constructed in external ori-fice plate to confirm the bactericidal effect of methylate blue light power on enterococcus faecalis.The photodynamic cleaning efficiency of enterococcus faecalis biofilms was compared in the in vitro root canals with different prepara-tion levels.Results:Photodynamic therapy could kill enterococcus faecalis.At 0.04 taper of root canal preparation,the sterilization results of No.20 and 25 root canal groups were inferior to that of No.30 root canal group.In No.25 root canal group,the sterilization results of 0.04 taper group were inferior to those of 0.06 taper group and 0.08 taper group.Conclusion:Photodynamic can kill the enterococcus faecalis in the root canal,and the preparation of the root canal to 0.04 taper 30 and 0.06 taper 25 is a relatively good preparation for the cleaning of enterococcus fae-calis in the root canal with methyblue.
维普
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