title: Bone block fixation by ultrasound activated resorbable pin osteosynthesis: a biomechanical in vitro analysis of stability.
abstract: OBJECTIVE
  The aim of this study was to determine the compound strength of the fixation between 2 blocks of synthetic bone using ultrasound activated resorbable pins (regarding drill hole diameter) and compare them to fixation with titanium miniscrews. Resorbable pins were up to 17 mm long.
  
  
  METHODS
  Two synthetic bone blocks (Sawbone) were fixed by either a resorbable pin or miniscrew osteosynthesis. Maximum tensile forces were determined mechanically. Pin lengths of 7 mm, 11 mm, and 17 mm were analyzed in relation to different drill hole diameters.
  
  
  RESULTS
  The ideal drill hole configuration was a combination of diameters of 2.1/1.6 mm (in a lag screw configuration). Mean maximum tensile force was 80 N for 7 mm pins (105 N/11 mm, 69 N/17 mm). In comparison, tensile forces of titanium screws were 20 N (7 mm), 97 N (11 mm), and 135 N (17 mm).
  
  
  CONCLUSIONS
  Osteosynthesis by resorbable pins reached equal compound strength levels compared with titanium miniscrews. This in vitro study was the basis for a clinical trial of ultrasound-guided resorbable pin osteosynthesis.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Faculty of Medicine, University of Technology Dresden, Dresden, Germany. matthias.schneider@uniklinikum-dresden.de
authors.forename: Matthias
authors.initials: M
authors.lastname: Schneider
authors.forename: Richard
authors.initials: R
authors.lastname: Loukota
authors.forename: Bernd
authors.initials: B
authors.lastname: Reitemeier
authors.forename: Heike
authors.initials: H
authors.lastname: Meissner
authors.forename: Bernd
authors.initials: B
authors.lastname: Stadlinger
authors.forename: Uwe
authors.initials: U
authors.lastname: Eckelt
authors.forename: Gerd
authors.initials: G
authors.lastname: Richter
mesh_terms: D020341:Absorbable Implants; D001696:Biomechanical Phenomena; D001858:Bone Nails; D001863:Bone Screws; D018786:Bone Substitutes; D003799:Dental Stress Analysis; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D050723:Fractures, Bone / Q000601:surgery; D011140:Polyurethanes; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D014465:Ultrasonics
chemical_list: D018786:Bone Substitutes; D011140:Polyurethanes