title: [The establishment of digital model about sagittal split ramus osteotomy and stability analysis of 3 different fixation methods].
abstract: OBJECTIVE
  To establish the digital model about sagittal split ramus osteotomy and discuss the stress and displacement of 3 different fixation methods.
  
  
  METHODS
  Three-dimensional reconstruction software Mimics and Geomagic were used to establish the three-dimensional entity model of mandible, and simulated sagittal split ramus osteotomy and fixation. Three-dimensional finite element model was established by mesh generation through ANSYS. After boundary constraint the occlusal load of 132N on the bilateral lower first molars was applied.
  
  
  RESULTS
  Three-dimensional finite element models of sagittal split ramus osteotomy and 3 different fixation methods were established, and the biomechanical character of stress and displacement after occlusal load preoperatively and after splitting mandibles were found.
  
  
  CONCLUSIONS
  As the stress distribution tends to uniformity and the displacement at split area is the least one, the fixation by bicortical screws in inverted-L position after sagittal split ramus osteotomy is the stablest of the 3 fixation methods. Supported by Natural Science Foundation of Guangdong Province (S2011010003872) and Science and Technology Projects of Guangzhou City (7421165457455).
authors.affiliation: Department of Oral and Maxillofacial Surgery, Southern Medical University, Guangzhou, China. yinxm@fimmu.com
authors.forename: Xue-min
authors.initials: XM
authors.lastname: Yin
authors.forename: Jun-wei
authors.initials: JW
authors.lastname: Zhang
authors.forename: Xiao-xu
authors.initials: XX
authors.lastname: Ren
authors.forename: Guo-xiang
authors.initials: GX
authors.lastname: Xu
authors.forename: Xiao
authors.initials: X
authors.lastname: Liu
mesh_terms: D001863:Bone Screws; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D008334:Mandible; D059229:Osteotomy, Sagittal Split Ramus; D013314:Stress, Mechanical