title: Limitations of osseous genioplasty in relation to the displacement distance: a computer-based comparative study.
abstract: OBJECTIVE
  The aim of this study was to compare the contact surface area (CSA) between bony segments after performing 4 different osteotomy techniques for genioplasty.
  
  
  METHODS
  Virtual genioplasties were done in terms of sliding or chin-shield genioplasty and 1- or 2-tiered genioplasty on computed tomography (CT) data from 42 patients. Advancement or setback genioplasty was simulated at 3, 5, 8, and 10 mm. The resulting bony contact areas were calculated by using software.
  
  
  RESULTS
  No statistically differences were found between both 2-tiered techniques at any displacement distance. Significant statistical differences were noticed between 1-tiered genioplasty and corresponding upper and lower osteotomy at 2-tiered genioplasty and between lower osteotomies of both 2-tiered techniques (P < .001). However, at a displacement distance of 8 mm, the CSA of the lower 2-tiered genioplasty was found to be larger than that of the corresponding after 1-tiered genioplasty (P < .001).
  
  
  CONCLUSIONS
  From a displacement distance of 8 mm, a relatively larger CSA could be achieved after performing 2-tiered genioplasty technique.
authors: Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany; Department of Orthodontics, University Hospital of RWTH Aachen, Aachen, Germany. Electronic address: Smoehlhenrich@ukaachen.de.
authors: Stephan Christian
authors: SC
authors: Möhlhenrich
authors: Department of Medical Statistics, University Hospital of RWTH Aachen, Aachen, Germany.
authors: Nicole
authors: N
authors: Heussen
authors: Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany.
authors: Mohammad
authors: M
authors: Kamal
authors: Department of Orthodontics, University Hospital of RWTH Aachen, Aachen, Germany.
authors: Ulrike
authors: U
authors: Fritz
authors: Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany.
authors: Frank
authors: F
authors: Hölzle
authors: Department of Oral and Maxillofacial Surgery, University Hospital of RWTH Aachen, Aachen, Germany.
authors: Ali
authors: A
authors: Modabber
mesh_terms: D000328:Adult; D002680:Chin / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery*; D003198:Computer Simulation; D005260:Female; D063172:Genioplasty / Q000379:methods*; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D010027:Osteotomy; D011857:Radiographic Image Interpretation, Computer-Assisted; D014057:Tomography, X-Ray Computed