Campus Azurem

Guimarães, Portugal

Campus Azurem

Guimarães, Portugal

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Henriques B.,Federal University of Rio Grande do Norte | Nascimento R.M.,Federal University of Rio Grande do Norte | Miranda G.,Campus Azurem | Silva F.,Campus Azurem | Souza J.C.M.,Federal University of Santa Catarina
Biodental Engineering III - Proceedings of the 3rd International Conference on Biodental Engineering, BIODENTAL 2014 | Year: 2014

The aim of this work was to employ the Finite Element method (FE) on the study of thermal residual stresses arising in metal-ceramic dental restorations after cooling from the processing temperature. Two different interface designs were studied: conventional metal-ceramic sharp transition and a compositionally graded transition (FGM). The FE analysis was performed based on experimental data obtained for Young's Modulus and Coefficient of Thermal Expansion of the materials. Results have shown significant benefits of the FGM design over the traditional sharp transition in terms of the stress reduction and stress profile. Maximum tensile stresses were significantly reduced with the FGM design. © 2014 Taylor & Francis Group.


Santos R.L.P.,Federal University of Rio Grande do Norte | Henriques B.,Federal University of Rio Grande do Norte | Nascimento R.M.,Federal University of Rio Grande do Norte | Motta F.V.,Federal University of Rio Grande do Norte | And 2 more authors.
Biodental Engineering III - Proceedings of the 3rd International Conference on Biodental Engineering, BIODENTAL 2014 | Year: 2014

The use of the hot injection technique for the production of porcelain/zirconia based dental structural elements has been spread over the years. However, suitable parameters should be used for the production of components, providing them high mechanical properties. Therefore, proper optimization of the process allows producing materials with high densification and thus minimizing defects related to their confection. Thus, the aim of this study was to evaluate the best parameters for the preparation of powder pure porcelain samples of subsequent production of zirconia-reinforced porcelain at different proportions. The results showed that the powder porcelain injection is influenced by stage time conditions, sintering temperature and injection force. The powder porcelain injection must be made at sintering temperature exceeding 1000°C, and the stage time should not be less than 20 minutes. © 2014 Taylor & Francis Group.

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