title: The clinical treatment of complicated root canal therapy with the aid of a dental operating microscope.
abstract: OBJECTIVE
  To evaluate the clinical application of the dental operating microscope (DOM) in the management of complicated root canal therapy.
  
  
  METHODS
  345 teeth with 546 root canals which could not be successfully managed by conventional methods received therapy under the DOM with ultrasonic instruments by the same endodontists. The aetiology of the canals included calcification, broken instrument, missed canal and canal perforation. The teeth and canals successfully managed were then calculated.
  
  
  RESULTS
  406 canals were successfully managed with a rate of 74.4%; 246 teeth were successfully managed with a rate of 71.3%. The rates in each category of the complicated root canals were: 74.0% for calcified canals, 72.3% for canals blocked by broken instruments, 82.5% for missed canals and 72.7% for canal perforations.
  
  
  CONCLUSIONS
  The clinical application of the DOM is an effective way of managing complicated root canal therapy.
authors: Department of Endodontics, Nanjing Medical University, Nanjing, China.
authors: Daming
authors: D
authors: Wu
authors: Wei
authors: W
authors: Shi
authors: Jintao
authors: J
authors: Wu
authors: Younong
authors: Y
authors: Wu
authors: Weihong
authors: W
authors: Liu
authors: Qingping
authors: Q
authors: Zhu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003762:Dental Instruments / Q000009:adverse effects; D003784:Dental Pulp Calcification / Q000628:therapy*; D003786:Dental Pulp Cavity / Q000293:injuries*; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008853:Microscopy / Q000295:instrumentation* / Q000706:statistics & numerical data; D008875:Middle Aged; D018915:Root Canal Preparation / Q000295:instrumentation; D012390:Root Canal Therapy / Q000295:instrumentation*; D016896:Treatment Outcome; D014464:Ultrasonic Therapy; D055815:Young Adult