title: Photoelastic analysis of internal screw fixation after sagittal split ramus osteotomy.
abstract: An experimental study on mechanical behavior and stability of internal screw fixation (ISF) of sagittal split ramus osteotomy has been carried out. A stress freezing method in a three-dimensional photoelastic experiment was used. Four ISF's that utilized different screw placement patterns were used for photoelastic analysis: (1) 3 screw linear pattern placed at 90 degrees to the lateral surface of the model; (2) triangular pattern at 90 degrees to the surface of the model, 2 above and 1 below the mandibular canal; (3) 2 screw linear pattern at 90 degrees, and (4) 3 screw oblique linear pattern at 75, 60 and 45 degrees to the surface of the model. The stress distribution differs markedly according to these 4 methods.
authors.affiliation: Department of Oral Surgery, Kurume University School of Medicine, Japan.
authors.forename: H C
authors.initials: HC
authors.lastname: Kim
authors.forename: S
authors.initials: S
authors.lastname: Essaki
authors.forename: T
authors.initials: T
authors.lastname: Kameyama
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D001863:Bone Screws; D004548:Elasticity; D006801:Humans; D008027:Light; D008334:Mandible / Q000473:pathology / Q000503:physiopathology / Q000601:surgery*; D008953:Models, Anatomic; D008954:Models, Biological; D010027:Osteotomy / Q000295:instrumentation* / Q000379:methods*; D010781:Photography; D013314:Stress, Mechanical