The rate of acute postoperative pain was significantly lower X ( @ ) = @ , P < @ , in group @ ( @ % ) than in group @ ( @ % ) ; in group @ , @ % root canals were filled adequately while only @ % in group @ , the difference was significant ( X ( @ ) = @ , P < @ ) ; higher success rate ( X ( @ ) = @ , P < @ ) after @ year was achieved in group @ ( @ % ) compared with group @ ( @ % ) .