Influence of Intracanal Irradiation with Er,Cr:YSGG Laser System

Abstract

Adequate root canal irrigation that follows root canal preparation is one of the requisites for successful root canal treatment. Usually, root canal irrigation is performed by chemical or ultrasonic methods in the clinics. In this study, the characteristics of intracanal dentin surfaces irrigated with different conditions of the Er, Cr: YSGG laser system having controlled output frequency were examined by secondary electron image (SEI). The interface between dentin and root canal filling material was observed using SEI after obturation. Finally, dye penetration was performed to determine the sealing ability of root canal filling materials at the apex. The following conclusions were obtained as a result of these experiments. 1. Very smooth intracanal walls were observed by SEI, so the output frequency of the laser was high, and output level was low. Under all irrigation conditions, no smear layer was observed but opening dentinal tubule was observed. 2. Excellent attachment was observed between the intracanal surface and root canal materials in groups CL (Gutta-percha point+Canals-N: lateral condensation method) and WV(Obturation-gutta NT: Warm gutta-percha method)by SEI. Although the attachment was not inferior in group SS(Gutta-percha point+Super-Bond sealer: single cone technique), gaps existed between the canal wall and the root canal filling material. 3. There was no dye penetration at a point 1.5 mm from the apex. When using the Er, Cr: YSGG laser system for root canal irrigation, different conditions of laser irrigation may be required for root canal filling. Overall, it is suggested that the laser is suitable for clinical application.