title: Effect of framework material and vertical misfit on stress distribution in implant-supported partial prosthesis under load application: 3-D finite element analysis.
abstract: OBJECTIVE
  This study evaluated the influence of framework material and vertical misfit on stress created in an implant-supported partial prosthesis under load application.
  
  
  METHODS
  The posterior part of a severely reabsorbed jaw with a fixed partial prosthesis above two osseointegrated titanium implants at the place of the second premolar and second molar was modeled using SolidWorks 2010 software. Finite element models were obtained by importing the solid model into an ANSYS Workbench 11 simulation. The models were divided into 15 groups according to their prosthetic framework material (type IV gold alloy, silver-palladium alloy, commercially pure titanium, cobalt-chromium alloy or zirconia) and vertical misfit level (10 µm, 50 µm and 100 µm). After settlement of the prosthesis with the closure of the misfit, simultaneous loads of 110 N vertical and 15 N horizontal were applied on the occlusal and lingual faces of each tooth, respectively. The data was evaluated using Maximum Principal Stress (framework, porcelain veneer and bone tissue) and a von Mises Stress (retention screw) provided by the software.
  
  
  RESULTS
  As a result, stiffer frameworks presented higher stress concentrations; however, these frameworks led to lower stresses in the porcelain veneer, the retention screw (faced to 10 µm and 50 µm of the misfit) and the peri-implant bone tissues.
  
  
  CONCLUSIONS
  The increase in the vertical misfit resulted in stress values increasing in all of the prosthetic structures and peri-implant bone tissues. The framework material and vertical misfit level presented a relevant influence on the stresses for all of the structures evaluated.
authors: Department of Prosthodontics and Periodontics, Piracicaba Dental School, Campinas State University, Piracicaba, SP, Brazil. atais_bacchi@yahoo.com.br
authors: Ataís
authors: A
authors: Bacchi
authors: Rafael Leonardo Xediek
authors: RL
authors: Consani
authors: Marcelo Ferraz
authors: MF
authors: Mesquita
authors: Mateus Bertolini Fernandes
authors: MB
authors: Dos Santos
mesh_terms: D015921:Dental Implants; D020342:Finite Element Analysis; D006801:Humans; D016348:Osseointegration; D013312:Stress, Physiological
chemical_list: D015921:Dental Implants