title: Endodontic surgery with ultrasonic retrotips: one-year follow-up.
abstract: OBJECTIVE
  The purpose of this prospective clinical study was to monitor the outcome of ultrasonic root-end preparation, in relation to tooth type and location, presence of post restoration and type of retrotip.
  
  
  METHODS
  Teeth treated surgically showed a periradicular lesion of strictly endodontic origin. Fifty teeth were included in the study, according to specific selection criteria. Cases were followed for a period of 1 year and then classified in 3 groups (success, uncertain healing, and failure) according to radiographic and clinical criteria.
  
  
  RESULTS
  Of the 46 teeth evaluated at 1-year follow-up, 42 teeth (91.3%) successfully healed, 1 tooth had uncertain healing, and 3 failed. We found no statistically significant differences in treatment results related to the type of tooth, tooth location, post restoration, and type of retrotip.
  
  
  CONCLUSIONS
  Adherence to a strict endodontic surgical protocol and the use of contemporary techniques and materials can lead to a predictable outcome.
authors.affiliation: Department of Odontology, Galeazzi Institute, University of Milano, Milan, Italy.
authors.forename: Silvio
authors.initials: S
authors.lastname: Taschieri
authors.forename: Massimo
authors.initials: M
authors.lastname: Del Fabbro
authors.forename: Tiziano
authors.initials: T
authors.lastname: Testori
authors.forename: Luca
authors.initials: L
authors.lastname: Francetti
authors.forename: Roberto
authors.initials: R
authors.lastname: Weinstein
mesh_terms: D000328:Adult; D001047:Apicoectomy / Q000295:instrumentation / Q000379:methods; D003722:Dental Alloys; D003762:Dental Instruments; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D010485:Periapical Periodontitis / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D012184:Retrograde Obturation; D018915:Root Canal Preparation / Q000295:instrumentation*; D013193:Stainless Steel; D014092:Tooth Root / Q000000981:diagnostic imaging; D014464:Ultrasonic Therapy / Q000295:instrumentation*; D015040:Zirconium
chemical_list: D003722:Dental Alloys; D013193:Stainless Steel; D015040:Zirconium