title: Atraumatic vertical tooth extraction: a proof of principle clinical study of a novel system.
abstract: OBJECTIVE
  The aim of this study was to evaluate the applicability and limitations of a novel atraumatic extraction system.
  
  
  METHODS
  Seventy-two patients with severely decayed teeth or root remnants not suitable for forceps extraction were consecutively recruited and had 111 teeth extracted with the use of a novel atraumatic vertical extraction system (Benex). Various patient, tooth, and procedure data were recorded and analyzed.
  
  
  RESULTS
  Overall, 92 out of 111 teeth (83%) were successfully extracted. The success rate was higher in single-rooted teeth (89%) and lower in multirooted teeth (43%), with a risk ratio for failure of multirooted versus single-rooted teeth of 5.2 (95% confidence interval 2.5-10.7). The majority of failures were characterized by insufficient retention of the screw and/or root fracture, which mainly occurred as a result of caries in the root canal, misplacement/misalignment of the screw by the surgeon, or a fracture of the root in response to drilling and/or moderate input of traction force.
  
  
  CONCLUSIONS
  The Benex extractor system may be successfully used for atraumatic tooth extraction. The system has a higher success rate with single-rooted teeth compared with multirooted teeth. Extraction failure is mostly associated with insufficient retention or misplacement of the screw and root fracture.
authors: Department of Oral Surgery, Birmingham Dental Hospital, Birmingham Community Healthcare NHS Trust, Birmingham, United Kingdom.
authors: Egon
authors: E
authors: Muska
authors: Clemens
authors: C
authors: Walter
authors: Alan
authors: A
authors: Knight
authors: Pankaj
authors: P
authors: Taneja
authors: Yogesh
authors: Y
authors: Bulsara
authors: Michael
authors: M
authors: Hahn
authors: Mayur
authors: M
authors: Desai
authors: Thomas
authors: T
authors: Dietrich
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000772:Anesthesia, Local; D003731:Dental Caries / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014081:Tooth Extraction / Q000295:instrumentation / Q000379:methods*; D014092:Tooth Root / Q000601:surgery; D016896:Treatment Outcome