title: Application of a new viscoelastic finite element method model and analysis of miniscrew-supported hybrid hyrax treatment.
abstract: BACKGROUND
  In this study, we aimed to assess the ability of a new viscoelastic finite element method model to accurately simulate rapid palatal expansion with a miniscrew-supported hybrid hyrax appliance.
  
  
  METHODS
  A female patient received 3-dimensional craniofacial imaging with computed tomography at 2 times: before expansion and immediately after expansion, with the latter serving as a reference model for the analysis. A novel approach was applied to the finite element method model to improve simulation of the viscoelastic properties of osseous tissue.
  
  
  RESULTS
  The resulting finite element method model was a suitable approximation of the clinical situation and adequately simulated the forced expansion of the midpalatal suture. Specifically, it demonstrated that the hybrid hyrax appliance delivered a force via the 2 mini-implants at the center of resistance of the nasomaxillary complex.
  
  
  CONCLUSIONS
  The newly developed model provided a suitable simulation of the clinical effects of the hybrid hyrax appliance, which proved to be a suitable device for rapid palatal expansion.
authors: Department of Orthodontics, University of Homburg/Saar, Germany.
authors: Björn
authors: B
authors: Ludwig
authors: Sebastian
authors: S
authors: Baumgaertel
authors: Berna
authors: B
authors: Zorkun
authors: Lars
authors: L
authors: Bonitz
authors: Bettina
authors: B
authors: Glasl
authors: Benedict
authors: B
authors: Wilmes
authors: Jörg
authors: J
authors: Lisson
mesh_terms: D000293:Adolescent; D000539:Alveolar Process / Q000502:physiology; D003198:Computer Simulation; D015921:Dental Implants; D003799:Dental Stress Analysis / Q000379:methods*; D004548:Elasticity; D005260:Female; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D008954:Models, Biological; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D016382:Orthodontic Appliance Design; D009967:Orthodontic Appliances; D010155:Palatal Expansion Technique / Q000295:instrumentation; D014783:Viscosity
chemical_list: D015921:Dental Implants