title: [The ultrasonic treatment of curved, fine and obstructed root canal].
abstract: OBJECTIVE
  To investigate and evaluate the method of managing curved, fine, and obstructed root canals during endodontic treatment.
  
  
  METHODS
  Ultrasonic treatment of such root canals was used in 73 cases.
  
  
  RESULTS
  The root canals were enlarged and filled in 69 cases, with a success rate of 94.5%. Fracture of the tooth, lateral perforation of the canal, and breaking of the reamer were not found. Failure occurred in 4 cases where the canals were obstructed.
  
  
  CONCLUSIONS
  The ultrasonic treatment of root canal is an effective, practical, and safe method. Nevertheless, its use in curved and severely obstructed root canals is limited.
authors.affiliation: School of Stomatology, Shanghai Second Medical University, Shanghai 200011.
authors.forename: J
authors.initials: J
authors.lastname: Hong
authors.forename: X
authors.initials: X
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
mesh_terms: D003786:Dental Pulp Cavity; D005260:Female; D006801:Humans; D008297:Male; D012390:Root Canal Therapy; D014464:Ultrasonic Therapy