Objective:To compare the of root fillings quality of different tapered gutta-percha cones combined with GuttaFlow obturation system. Methods:40 extracted human maxillary incisors were prepared with K3 Ni-Ti rotary system to file size 40 and 0.06 taper. The teeth were randomly separated into 0.02 tapered group and 0.06 taper group. These teeth were respectively obturated with multiple 0.02 tapered gutta-percha points or a single 0.06 tapered gutta-percha point using GuttaFlow system. Each root canal was radi...