title: The impact of fractured endodontic file removal on vertical root fracture resistance: three-dimensional finite element analysis.
abstract: This study investigated by means of finite element analysis the influence of fractured file removal on root fracture resistance in an endodontically-treated canine. A 4mm fragment of an endodontic file was deliberately fractured in the apical third of an upper canine root and removed by ultrasonic tips. Micro-computed tomography scans were carried out before and after fractured file removal on the same tooth. Two 3D-FE models (before and after file removal) were subjected to 100N loading. Results indicate that the fractured file removal increased von Mises stresses by 55%. Peak stresses were located around the root filling/dentine interface prior to file removal. Following file removal, peak stresses were concentrated at the buccal root surface/bone interface that might initiate vertical root fracture buccolingually.
authors.affiliation: King's College London Dental Institute, London, UK. shihab.romeed@kcl.ac.uk
authors.forename: S A
authors.initials: SA
authors.lastname: Romeed
authors.forename: S M
authors.initials: SM
authors.lastname: Dunne
authors.forename: A A
authors.initials: AA
authors.lastname: Madarati
mesh_terms: D003198:Computer Simulation; D003481:Cuspid; D003762:Dental Instruments / Q000009:adverse effects*; D003786:Dental Pulp Cavity; D003799:Dental Stress Analysis / Q000379:methods; D004868:Equipment Failure; D020342:Finite Element Analysis; D005547:Foreign Bodies / Q000628:therapy*; D006801:Humans; D018915:Root Canal Preparation / Q000295:instrumentation*; D014082:Tooth Fractures / Q000209:etiology*