The main cause for endodontics treatment failure is microorganisms remaining in place. Entrococcus faecalis is one the most resistant bacteria in endodontic failures. Based on these facts we decided to compare the antibacterial effects of erbium, chromium-doped yttrium, scandium, gallium and garnet (Er,Cr:YSGG) laser and chlorhexidine 2% solution against E. faecalis. In this experimental study, 60 anterior teeth were divided into four groups: chlorhexidine (n = 25), Er,Cr:YSGG laser (2780 nm, 25 mJ, 0.5 W) (n = 25), positive and negative control (n = 5). About 56% of laser group plates and 4% of chlorhexidine plates showed bacterial growth. Chlorhexidine 2% was significantly more effective against entrococcus than Er,Cr:YSGG laser (p < 0.001). Both Er,Cr:YSGG laser and chlorhexidine 2% had bactericidal effect on E. faecalis, however chlorhexidine 2% was significantly more effective.

牙髓治疗失败的主要原因是微生物残留。粪肠球菌是牙髓治疗失败中最具抵抗力的细菌之一。基于这些事实，我们决定比较铒、掺铬钇、钪、镓和石榴石 (Er,Cr:YSGG) 激光和 2% 氯己定溶液对粪肠球菌的抗菌作用。在本实验研究中，将 60 颗前牙分为四组：洗必泰 ( n = 25)、Er,Cr:YSGG 激光 (2780 nm, 25 mJ, 0.5 W) ( n = 25)、阳性和阴性对照 ( n= 5）。大约 56% 的激光组板和 4% 的氯己定板显示出细菌生长。与 Er,Cr:YSGG 激光相比，2% 氯己定对肠球菌的作用显着更有效 ( p < 0.001)。Er,Cr:YSGG 激光和 2% 氯己定对粪肠球菌均有杀菌作用，但 2% 氯己定更有效。