To discuss the effect of root canal seal achieved by the irradiation of Er,Cr:YSGG laser and to provide the important experimental basis for clinical application of Er,Cr:YSGG laser.

• 探讨常规根管预备后使用不同能量参数Er,C r:YSGG激光进行根管内照射对根管封闭效果的影响,为此激光在根管治疗领域的临床应用提供重要的实验依据。