Bactericidal effects and smear layer removal of Er∶YAG-laser radiation against Enterococcus faecalis in root canals

VernacularTitle:Er∶YAG激光对根管内粪肠球菌和玷污层的清理效果
Author: Zongbo LI ; Changyun FANG
Keywords: Er∶YAG laser; Enterococcus faecalis; infected root; bactericidal effect; smear layer
From: Journal of Central South University(Medical Sciences) 2017;42(3):328-333
CountryChina
Language:Chinese
Abstract: Objective:To evaluate the cleaning ability of Er∶YAG laser against Enterococcus faecalis in root canals.Methods:The single-rooted human teeth were sterilized and inoculated with Enterococcusfaecalis and were randomly assigned into 2 groups.A group of teeth was irrigated with saline during root canal preparation while another group with NaClO.After mechanical preparation,the two groups were randomly divided into 3 subgroups according to the different treatments:Samples,laser radiation,and calcium hydroxide intracanal medication for 7 days.Bactericical effects were compared among groups.Root canal walls and dental tubules were observed under scanning electron microscope.Results:Er∶YAG laser was the most efficient way for anti-bacteria among the groups (P＜0.05),but there was no significant difference between the 2 laser groups (P＞0.05).Meanwhile the smear laser was efficiently removed by laser compared with other treatments,and the laser could open the dentinal tubules.Conclusion:Er∶YAG laser can be effectively used for root canal disinfection without NaClO and Ca(OH)2.