Analise fotoelastica da distribuição de tensão em diferentes sistemas de overdentures sobre implantes osseointegrados / Photoelastic analysis of the distribution of stress in different systerms of overdentures on osseous-integrated implants

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The aim of this study was to evaluate through photoelastic analysis, the distribution of generated stress around implants and adjacent bone tissue, using differents implant-retained overdentures designs. Over an edentulous human mandible, achieve from a human model, 2 or 4 micro-unit replications abutments were embedded (Master, Conexao - Sao Paulo - SP) settled in the interforaminal region. Three models of photoelastic resin (Araltec Chemicals Ltda. Hunstman, Guarulhos, Sao Paulo, Brazil), with 2 or 4 incorporated implants (Master - Conexao) and Micro-Unit abutments, were obtained from mulds using silicone for duplication (Silicone Master - talladium do Brazil). Inclusion, finishing and polishing procedures were applied on the frameworks. This study was based on three different mechanisms of implant-retained mandibular overdentures: ball attachment (GI), bar attachment (GII) (both with 2 implants) and their association (GIII) (with 4 implants). After the adaptation of each overdenture system on the photoelastics models, 100N alternates oclusals charges were applied on backside and frontside regions. The photoelastic analysis was made with the aid of a plain polariscope (Measurements Group, USA) linked to a digital camera Sony Cybershot a100 (Sony Corp, Japan) that allowed visualize the fringes and register images on digital photos. The results demonstrated higher tension concentrated over the Group III, with a flat distribution of stress to the posterior ridge and overload on the posterior implants. Group I showed the smaller stress level and Group II intermediate level, there was distribution of stress to the posterior ridge in this two groups. Key words: Osseointegrated Implant, Overdenture, Bar System, Ball System, Photoelastic Analysis

ASSUNTO(S)

implantes dentários protese dentaria dental implants dental prosthesis

ACESSO AO ARTIGO

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