Management of the multi-fracture of dental instruments in tooth root canal by microscope ultrasonic technique / 实用口腔医学杂志

This paper summarizes 6 cases with multi-fracture of dental instruments in tooth root canal treated in our hospital from June 2011 to July 2013,the creation of a straight pathway,establishment of collateral bypass ,ultrasonic vibration,prevention of root perforation and secondary instrument fracture were emphasized,a reference in dealing with similar situations was provided.