The rate of acute postoperative pain was significantly lower X ( 2 ) = 4.87 , P < 0.05 , in group 1 ( 8.20 % ) than in group 2 ( 22.81 % ) ; in group 1 , 92.86 % root canals were filled adequately while only 78.92 % in group 2 , the difference was significant ( X ( 2 ) = 17.45 , P < 0.05 ) ; higher success rate ( X ( 2 ) = 3.95 , P < 0.05 ) after 1 year was achieved in group 1 ( 91.80 % ) compared with group 2 ( 78.95 % ) .