title: Ultrasonic preparation improves outcome in apical surgery.
abstract: METHODS
  This was a randomised controlled trial (RCT).
  
  
  METHODS
  Root-end resection and preparation with a round dental bur was compared with the use of ultrasonic diamond coated retro-tips.
  
  
  METHODS
  Treatment was considered a success when the radiological and clinical criteria listed (Table 1) were met.
  
  
  RESULTS
  Out of a total group of 399 patients who were included in the study, adequate followup could be obtained in 290 patients. The overall success rate in the ultrasonic group was 80.5% and in the group treated with a bur was 70.9% (P 0.056). In molars, the difference in success rate was significant (P 0.02).
  
  
  CONCLUSIONS
  The use of an ultrasonic device in apical surgery showed a clear benefit over the traditional treatment. Especially in molars, the results were significant.
authors.affiliation: Department of General Dentistry, Fukuoka Dental College, Fukuoka, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Naito