title: Influence of Implant Position on Stress Distribution in Implant-Assisted Distal Extension Removable Partial Dentures: A 3D Finite Element Analysis.
abstract: OBJECTIVE
  Distal extension removable partial denture is a prosthesis with lack of distal dental support with a 13-fold difference in resiliency between the mucosa and the periodontal ligament, resulting in leverage during compression forces. It may be potentially destructive to the abutments and the surrounding tissues. The aim of this study was to assess the effect of implant location on stress distribution, in distal extension implant assisted removable partial dentures.
  
  
  METHODS
  Three-dimensional models of a bilateral distal extension partially edentulous mandible containing anterior teeth and first premolar in both sides of the arch, a partial removable denture and an implant (4×10mm) were designed. With the aid of the finite element program ANSYS 8.0, the models were meshed and strictly vertical forces of 10 N were applied to each cusp tip. Displacement and von Mises Maps were plotted for visualization of results.
  
  
  RESULTS
  When an implant was placed in the second premolar region, the highest stress on implant, abutment tooth and cancellous bone was shown. The lowest stress was shown on implant and bone in the 1(st) molar area.
  
  
  CONCLUSIONS
  Implants located in the first molar area showed the least distribution of stresses in the analyzed models.
authors: Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Yeganeh
authors: Y
authors: Memari
authors: Professor, Dental Research Center Dentistry Research Institute, Tehran University of Medical Sciences, Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran.
authors: Allahyar
authors: A
authors: Geramy
authors: Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors: Amir
authors: A
authors: Fayaz
authors: Assistant Professor, Department of Prosthodontics, Dental School, Qazvin University of Medical Sciences, Qazvin, Iran.
authors: Shirin
authors: S
authors: Rezvani Habib Abadi
authors: Private Practice.
authors: Yasaman
authors: Y
authors: Mansouri
keywords: Finite Element Analysis; Implant; Removable partial denture
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