title: Stability of fixation of diacapitular fractures of the mandibular condylar process by ultrasound-aided resorbable pins (SonicWeld Rx® System) in pigs.
abstract: To assess the stability of osteosynthesis in diacapitular condylar fractures we compared fixation using ultrasound-aided resorbable pins with poly-(D,L)-lactide (SonicWeld® Rx, KLS Martin, Tuttlingen, Germany) with that of titanium screws in 20 pig mandibles, 10 in each group. Isolated diacapitular fractures were created using a surgical chisel. Ten fractures were each repositioned and fixed by two pins (17 and 11 mm long, 2.1mm in diameter), and 10 fractures were fixed by two titanium screws of equal length, 2.0mm in diameter. Shear tests were done immediately after treatment to measure the maximum force to disrupt the fixation. Fixation with pins resisted mean shear forces of 310N until the pins fractured, whereas fixation with titanium screws failed at 918N when the screws pulled out of the bone. Long-term stability and resorption of pins will have to be analysed in an in vivo study.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Faculty of Medicine, University of Technology-Dresden, Fetscherstrasse 74, Dresden, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Schneider
authors.forename: Uwe
authors.initials: U
authors.lastname: Eckelt
authors.forename: Bernd
authors.initials: B
authors.lastname: Reitemeier
authors.forename: Heike
authors.initials: H
authors.lastname: Meissner
authors.forename: Gerd
authors.initials: G
authors.lastname: Richter
authors.forename: Richard
authors.initials: R
authors.lastname: Loukota
authors.forename: Bernd
authors.initials: B
authors.lastname: Stadlinger
mesh_terms: D020341:Absorbable Implants; D000818:Animals; D001672:Biocompatible Materials / Q000737:chemistry; D001696:Biomechanical Phenomena; D001858:Bone Nails; D001863:Bone Screws; D004868:Equipment Failure; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D008335:Mandibular Condyle / Q000293:injuries*; D008337:Mandibular Fractures / Q000601:surgery*; D008422:Materials Testing; D010027:Osteotomy / Q000379:methods; D011091:Polyesters / Q000737:chemistry; D033081:Shear Strength; D013314:Stress, Mechanical; D013552:Swine; D014025:Titanium / Q000737:chemistry; D016896:Treatment Outcome; D014465:Ultrasonics
chemical_list: D001672:Biocompatible Materials; D011091:Polyesters; C033616:poly(lactide); D014025:Titanium