| Texto completo | |
| Autor(es): |
Edwards Rezende, Carlos Eduardo
;
Sanches Borges, Ana Flavia
;
Gonzaga, Carla Castiglia
;
Duan, Yuanyuan
;
Rubo, Jose Henrique
;
Grigg, Jason Alan
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Dental Materials; v. 33, n. 2, p. 144-151, FEB 2017. |
| Citações Web of Science: | 7 |
| Resumo | |
Objective. To evaluate the stress distribution in bi-layered Y-TZP based crowns, according to the occlusal internal spacing between coping and abutment. Methods. Twelve premolar shaped Y-TZP copings were made by a CAD/CAM system and seated on an abutment to evaluate the internal fit at the occlusal third using micro-CT images. Considering the fitting range obtained experimentally, two 3D finite element models, consisting on bone tissue, a titanium implant, a zirconia abutment, cement layer and a bi-layered Y-TZP ceramic crown were constructed based on the micro-CT images, one corresponding to the thinnest cement space and other representing the specimen with the thickest cement space obtained experimentally. A 250 N axial load was applied at the center of the occlusal surface of the crown (congruent to 0,8 mm(2) area) and the first principal stress distribution was plotted and analyzed. Results. The greatest maximum principal stress occurred within the veneer ceramic right below the site of loading. The thickest cement model showed higher stress concentration at the center of occlusal surface of veneer and the center of occlusal internal surface of coping. Significance. Knowledge of stress distribution in ceramic crowns with different cement thicknesses will help clinicians to properly adjust crown fit, in seeking to avoid porcelain fractures. (C) 2016 The Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 11/18061-0 - Análise mecânica, estrutural e de copings de zircônia experimental para uso em sistema CAD/CAM |
| Beneficiário: | Ana Flávia Sanches Borges |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 13/10021-5 - Confiabilidade, modos de falha e adaptação de coroas protéticas unitárias |
| Beneficiário: | José Henrique Rubo |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |