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

Autor(es)

Barao, V. A. R. ^[1] ; Delben, J. A. ^[2] ; Lima, J. ^[3] ; Cabral, T. ^[4] ; Assuncao, W. G. ^[5]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF BIOMECHANICS; v. 46, n. 7, p. 1312-1320, APR 26 2013.
• Citações Web of Science: 8

Resumo

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)

• Processo FAPESP: 07/58926-5 - Análise comparativa da distribuição interna de tensões entre overdentures implanto-retidas e próteses fixas implanto-suportadas do tipo protocolo, através do método de elementos finitos tridimensional
• Beneficiário: Valentim Adelino Ricardo Barão
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/09857-3 - Comparação da distribuição de tensões em diferentes próteses fixas implanto-suportadas mandibulares do tipo protocolo para carregamento imediato: análise não linear por meio do MEF-3D baseado em tomografia computadorizada
• Beneficiário: Wirley Goncalves Assuncao
• Modalidade de apoio: Auxílio à Pesquisa - Regular