title: Stability of locking and conventional 2.0-mm miniplate/screw systems after sagittal split ramus osteotomy: finite element analysis.
abstract: OBJECTIVE
  The aim of this study was to evaluate the mechanical stresses over the bone and hardware after sagittal split ramus osteotomy (SSRO) fixed with standard titanium or locking plate/screws using finite element analysis.
  
  
  METHODS
  A 3-dimensional finite element model of the mandible was created, and SSRO and 5 mm advancement was simulated on a computer model. The model was fixed with either 2.0-mm titanium conventional miniplate/screw or 2.0-mm titanium locking miniplate/screw system, and oblique 200 N bite force was applied.
  
  
  RESULTS
  The values of von Mises stresses in the cortical layer of the distal segment using the locking plate system was higher. However, in the cortical layer of the proximal segment the stresses were higher at conventional plate system. In the spongiosa layers of both segments, stresses were higher with the conventional plate system.
  
  
  CONCLUSIONS
  The locking miniplate/screw system spreads the load over the plate and screws and diminishes the amount of force transfered to each unit.
authors.affiliation: Faculty of Dentistry Oral, Maxillofacial Surgery Department, Baskent University, Ankara, Turkey. yenero80@yahoo.com
authors.forename: Yener
authors.initials: Y
authors.lastname: Oguz
authors.forename: Sina
authors.initials: S
authors.lastname: Uckan
authors.forename: Ahmet Utku
authors.initials: AU
authors.lastname: Ozden
authors.forename: Eren
authors.initials: E
authors.lastname: Uckan
authors.forename: Atilim
authors.initials: A
authors.lastname: Eser
mesh_terms: D001860:Bone Plates / Q000706:statistics & numerical data; D001863:Bone Screws / Q000706:statistics & numerical data; D003198:Computer Simulation; D004867:Equipment Design; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D019248:Jaw Fixation Techniques / Q000295:instrumentation*; D008334:Mandible / Q000601:surgery*; D019186:Mandibular Advancement / Q000295:instrumentation* / Q000379:methods; D008953:Models, Anatomic; D010027:Osteotomy / Q000295:instrumentation*; D013314:Stress, Mechanical; D016474:Weight-Bearing