title: [Treating the fine canals and obstructed canals with ultrasound in 70 cases]
abstract: The fine canals and obstructed canals were treated with ultrasound in 70 cases.Canals were re-enlarged and filled in 61 cases,with a success rate of 89%.No lateral perforation or tooth facture was due to excessive loss of the teeth structure.This method was proved to be more effective and safer than traditional method.
authors.affiliation: Department of Endodontics, Ninth People's Hospital, School of Stomatology,Shanghai Second Medical University. Shanghai 200011,China.
authors.forename: J
authors.initials: J
authors.lastname: Hong
authors.forename: Z M
authors.initials: ZM
authors.lastname: Wang
authors.forename: X Y
authors.initials: XY
authors.lastname: Wang