title: Finite Element Evaluation of Different Osteosynthesis Variations That Used After Segmental Mandibular Resection.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the effect of different reconstruction plates and screw combinations on stress distribution of segmental resected mandibles using finite element analysis.
  
  
  METHODS
  Lateral (L) and lateral-central (LC) defects were simulated by a computer aided design modeling. The straight (s) and angular (a) titanium locking reconstruction plates of 2.5 mm (12 holes for L defects and 16 holes for LC defects) were modeled. Each screw was 2.5 mm in diameter and 10 mm in length. A total of 20 different screw placement combinations were created. The bite force used in the present model was a unilateral molar clench. The data obtained from finite element analysis were recorded as von Mises, maximum principle and minimum principle stress values.
  
  
  RESULTS
  It was observed that stress values on neck of screw were higher for screws close to the resection area. When the first screw was loosened, the stress on the plate body and the remaining screws increased. Principle stress values were within the tolerance limits of the bone.
  
  
  CONCLUSIONS
  The highest stress is observed in the screws nearest to the resection edge. Therefore, it is very important to place a screw adjacent to the resection edge.
authors.affiliation: *Department of Oral and Maxillofacial Surgery, Samsun Oral and Dental Health Hospital, Ministry of Health †Faculty of Dentistry, Department of Oral and Maxillofacial Surgery, Ondokuz Mayis University, Samsun, Turkey.
authors.forename: Koray Onur
authors.initials: KO
authors.lastname: Şanal
authors.forename: Bora
authors.initials: B
authors.lastname: Özden
authors.forename: Burcu
authors.initials: B
authors.lastname: Baş
mesh_terms: D001696:Biomechanical Phenomena / Q000502:physiology; D001732:Bite Force; D001860:Bone Plates; D001863:Bone Screws; D003198:Computer Simulation; D017076:Computer-Aided Design; D020342:Finite Element Analysis; D006801:Humans; D008334:Mandible / Q000503:physiopathology*; D063168:Mandibular Osteotomy / Q000295:instrumentation* / Q000379:methods*; D013314:Stress, Mechanical