Influence of Implant Position on Stress Distribution in Implant-Assisted Distal Extension Removable Partial Dentures: A 3D Finite Element Analysis

Yeganeh Memari, Allahyar Geramy, Amir Fayaz, Shirin Rezvani Habib Abadi, Yasaman Mansouri, Yeganeh Memari, Allahyar Geramy, Amir Fayaz, Shirin Rezvani Habib Abadi, Yasaman Mansouri

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.

Materials and 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.

Conclusion: Implants located in the first molar area showed the least distribution of stresses in the analyzed models.

Keywords: Finite Element Analysis; Implant; Removable partial denture.

Figures

Fig 1.
Fig 1.
Model A, Model B and Model C.
Fig 2.
Fig 2.
The meshed model
Fig 3.
Fig 3.
Assessment of 10 points for stress probing in the residual soft tissue ridge.
Fig 4.
Fig 4.
Stress contours when the implant was in the second premolar area.
Fig 5.
Fig 5.
Stress contours when the implant was in the first molar area.
Fig 6.
Fig 6.
Stress contours when the implant was in the second molar location.

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Source: PubMed

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