Author/Authors :
Memari, Yeganeh Department of Prosthodontics - Dental School, Shahid Beheshti University of Medical Sciences, Tehran , Geramy, Allahyar Department of Orthodontics - Tehran University of Medical Sciences, Tehran , Fayaz, Amir Department of Prosthodontics - Dental School, Shahid Beheshti University of Medical Sciences, Tehran , Rezvani Habib Abadi, Shirin Department of Prosthodontics - Dental School, Qazvin University of Medical Sciences, Qazvin , Mansouri, Yasaman
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 peri- odontal 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 as- sess the effect of implant location on stress distribution, in distal extension implant as- sisted removable partial dentures.
Materials and Methods: Three-dimensional models of a bilateral distal extension partial- ly 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 1st molar area.
Conclusion: Implants located in the first molar area showed the least distribution of stresses in the analyzed models
