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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Comparison of different designs of implant-retained overdentures and fixed full-arch implant-supported prosthesis on stress distribution in edentulous mandible - A computed tomography-based three-dimensional finite element analysis

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Author(s):
Barao, V. A. R. [1] ; Delben, J. A. [2] ; Lima, J. [3] ; Cabral, T. [4] ; Assuncao, W. G. [5]
Total Authors: 5
Affiliation:
[1] Univ Estadual Paulista UNESP. Aracatuba Dent Sch
[2] Univ Estadual Paulista UNESP. Aracatuba Dent Sch
[3] Smarttech Co. Sao Paulo
[4] Smarttech Co. Sao Paulo
[5] Univ Estadual Paulista UNESP. Aracatuba Dent Sch
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF BIOMECHANICS; v. 46, n. 7, p. 1312-1320, APR 26 2013.
Web of Science Citations: 8
Abstract

A finite element analysis was used to compare the effect of different designs of implant-retained overdentures and fixed full-arch implant-supported prosthesis on stress distribution in edentulous mandible. Four models of an human mandible were constructed. In the OR (O'ring) group, the mandible was restored with an overdenture retained by four unsplinted implants with O'ring attachment; in the BC (bar-clip) -C and BC groups, the mandibles were restored with overdentures retained by four splinted implants with bar-clip anchor associated or not with two distally placed cantilevers, respectively; in the FD (fixed denture) group, the mandible was restored with a fixed full-arch four-implant-supported prosthesis. Models were supported by the masticatory muscles and temporomandibular joints. A 100-N oblique load was applied on the left first molar. Von Mises (sigma(vM)), maximum (sigma(max)) and minimum (sigma(min)) principal stresses (in MPa) analyses were obtained. BC-C group exhibited the highest stress values (sigma(vM) = 398.8, sigma(max) = 580.5 and sigma(min) = -455.2) while FD group showed the lowest one (sigma(vM) =128.9, sigma(max) = 580.5 and sigma(min) = -172.1). Within overdenture groups, the use of unsplinted implants reduced the stress level in the implant/prosthetic components (59.4% for sigma(vM) 66.2% for sigma(max) and 57.7% for sigma(min) versus BC-C group) and supporting tissues (maximum stress reduction of 72% and 79.5% for sigma(max), and 15.7% and 85.7% for sigma(min) on the cortical and trabecular bones, respectively). Cortical bone exhibited greater stress concentration than the trabecular bone for all groups. The use of fixed implant dentures and removable dentures retained by unsplinted implants to rehabilitate edentulous mandible reduced the stresses in the periimplant bone tissue, mucosa and implant/prosthetic components. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 10/09857-3 - Comparison of stress distribution in different mandibular implant-supported fixed dentures for immediate loading: non-linear analysis by 3D-FEA based on computed tomography
Grantee:Wirley Goncalves Assuncao
Support Opportunities: Regular Research Grants