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Implant-Retained Mandibular Bar-Supported Overlay Dentures: A Finite Element Stress Analysis of Four Different Bar Heights Publisher Pubmed



Rismanchian M1 ; Dakhilalian M1 ; Bajoghli F1 ; Ghasemi E1 ; Sadreshkevari P2
Authors
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Authors Affiliations
  1. 1. Department of Fixed Prosthodontics, Torabinejad Research Center, Isfahan University of Medical Sciences (MUI), Isfahan, Iran
  2. 2. Dental Section, Farzan Institute of Science, Research and Technology, Tehran, Iran

Source: Journal of Oral Implantology Published:2012


Abstract

Proper stress distribution on dental implants is necessary in bar-retained implant overlay dentures. We aimed to comparatively assess this stress distribution according to different bar heights using finite element models. A three-dimensional (3D) computer model of mandible with 2 implants (ITI, 4.1 mm diameter and 12 mm length) in canine areas and an overlying implant-supported bar-retained overlay denture were simulated with 0-, 1-, 2-, and 3-mm bar heights using ABAQUS software. A vertical force was applied to the left first molar and gradually increased from 0 to 50 N. The resultant stress distribution was evaluated. Bars of 1 and 2 mm in height transferred the least stress to the implants (3.882 and 3.896 MPa, respectively). The 0-mm height of the bar connection transferred the highest stress value (4.277 MPa). The amount of stress transferred by 3-mm heights of the bar connection was greater than that of 1- and 2-mm bar connections and smaller than that of 0-mm bar connection (4.165 kgN). This 3D finite element analysis study suggested that the use of Dolder bar attachment with 1- and 2-mm heights could be associated with appropriate stress distribution for implant-retained overlay dentures.
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