title: Strength of titanium intramedullary implant versus miniplate fixation of mandibular condyle fractures.
abstract: OBJECTIVE
  To test the strength of internal fixation of mandibular condyle fractures repaired with titanium miniplates versus titanium intramedullary implants.
  
  
  METHODS
  Prospective laboratory experimentation in urethane mandible models and human cadaveric mandibles.
  
  
  METHODS
  Materials testing laboratory at an academic medical center.
  
  
  METHODS
  Osteotomies of the mandibular condyle were created in 40 urethane hemimandible models and 24 human cadaveric specimens. Half of the samples in each group were repaired with traditional miniplates, and the other half were repaired with intramedullary titanium implants. Anteroposterior and mediolateral loads were applied to the samples, and the displacement was measured with reference to the applied force.
  
  
  RESULTS
  Titanium intramedullary implants demonstrated statistically significant improved strength and stiffness versus miniplates in the urethane model experimental groups. Despite frequent plastic deformation and mechanical failures of the miniplates, a 1.6-mm-diameter titanium intramedullary pin did not mechanically fail in any of the cases. Intramedullary implantation failures were due to secondary fracture of the adjacent cortical bone or experimental design limitations including rotation of the smooth pin implant.
  
  
  CONCLUSIONS
  Mechanical implant failures that were encountered with miniplate fixation were not seen with titanium intramedullary implants. These intramedullary implants provide stronger and more rigid fixation of mandibular condyle fractures than miniplates in this in vitro model.
authors.affiliation: The George Washington University Medical Center, Washington, DC 20037, USA. pfrake@gmail.com
authors.forename: Paul C
authors.initials: PC
authors.lastname: Frake
authors.forename: Rebecca J
authors.initials: RJ
authors.lastname: Howell
authors.forename: Arjun S
authors.initials: AS
authors.lastname: Joshi
mesh_terms: D001860:Bone Plates; D002102:Cadaver; D005594:Fracture Fixation, Intramedullary; D006801:Humans; D008335:Mandibular Condyle / Q000293:injuries* / Q000601:surgery*; D008337:Mandibular Fractures / Q000601:surgery*; D008422:Materials Testing; D008953:Models, Anatomic; D014025:Titanium
chemical_list: D014025:Titanium