Erbium:Yttrium Aluminum Garnet Laser-Activated Sodium Hypochlorite Irrigation: A Promising Procedure for Minimally Invasive Endodontics. Academic Article uri icon


  • OBJECTIVE: This study was to evaluate the potential of Erbium:Yttrium Aluminum Garnet laser-activated sodium hypochlorite irrigation (Er:YAG + NaOCl) for minimally invasive endodontics (MIE). BACKGROUND DATA: Er:YAG laser irradiation can dramatically enhance the penetration of NaOCl, which may be a promising protocol for MIE. METHODS: Extracted human teeth were contaminated with Enterococcus faecalis for 4 weeks. The infected canals were then shaped to different apical terminal working widths (ATWW, 15#/0.04, 20#/0.04, 25#/0.04, 30#/0.04, and 40#/0.04) and treated with either Er:YAG + NaOCl (0.3W, 20sec) or NaOCl alone. Then, the ATWW were fixed at 15#/0.04, and the canals were treated with Er:YAG + NaOCl at 0.3W for 40 and 60sec, or at 0.5 and 1.0W for 20sec. Finally, bacterial reductions were evaluated using the cell count method. RESULTS: Er:YAG + NaOCl showed a higher disinfection efficacy at each ATWW compared with NaOCl alone (p<0.001). The maximum bacterial reduction was 99.9% for the 40#/Er:YAG + NaOCl group and 93.6% for the 40#/NaOCl group. To achieve similar disinfection efficacy, the Er:YAG + NaOCl group needed a smaller ATWW than the NaOCl group. At a fixed ATWW, increasing the output power of the Er:YAG laser was more effective than increasing the radiation time to improve the disinfection efficacy of Er:YAG + NaOCl. The 15#/Er:YAG + NaOCl group reached the maximum bacterial reduction of 99.2% when the Er:YAG laser was activated at 1.0W for 20sec. CONCLUSIONS: The 15#/Er:YAG + NaOCl with the Er:YAG laser irradiation at 1.0W for 20sec may be considered a promising procedure for MIE.

published proceedings

  • Photomed Laser Surg

altmetric score

  • 0.25

author list (cited authors)

  • Cheng, X., Tian, T., Tian, Y. u., Xiang, D., Qiu, J., Liu, X., & Yu, Q.

citation count

  • 14

complete list of authors

  • Cheng, Xiaogang||Tian, Tiantian||Tian, Yu||Xiang, Doudou||Qiu, Jun||Liu, Xiaohua||Yu, Qing

publication date

  • January 2017