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893 results on '"Valandro, Luiz Felipe"'

25. Fatigue strength of 5Y-FSZ: glazing and polishing effects

Author

de Carvalho, Ana Beatriz Gomes, Gonçalves, Natália Inês, Campos, Tiago Moreira Bastos, Zucuni, Camila, Valandro, Luiz Felipe, de Siqueira Ferreira Anzaloni Saavedra, Guilherme, Bottino, Marco Antonio, de Assunção e Souza, Rodrigo Othávio, and de Melo, Renata Marques

Published
2022
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32. Repair protocols for indirect monolithic restorations: a literature review

Author

da Rosa, Lucas Saldanha, primary, Pilecco, Rafaela Oliveira, additional, Soares, Pablo Machado, additional, Rippe, Marília Pivetta, additional, Pereira, Gabriel Kalil Rocha, additional, Valandro, Luiz Felipe, additional, Kleverlaan, Cornelis Johannes, additional, Feilzer, Albert J., additional, and Tribst, João Paulo Mendes, additional

Published
2024
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48. Fatigue behavior of multilayer ceramic structures in traditional and reverse layering designs.

Author

Contreras, Lisseth Patricia Claudio, Rodrigues, Camila Silva, Zucuni, Camila Pauleski, Valandro, Luiz Felipe, Marocho, Susana Maria Salazar, and de Melo, Renata Marques

Subjects
CERAMICS, CERAMIC materials, FAILURE mode & effects analysis, BILAYERS (Solid state physics), FATIGUE testing machines
Abstract

Purpose: This study evaluated the fatigue failure load (FFL) and the number of cycles for fatigue failure (CFF) of traditional (porcelain layer up) and reversed (zirconia layer up) designs of porcelain‐veneered zirconia samples prepared with heat‐pressing or file‐splitting techniques. Materials and Methods: Zirconia discs were prepared and veneered with heat‐pressed or machined feldspathic ceramic. The bilayer discs were bonded onto a dentin‐analog according to the bilayer technique and sample design: traditional heat‐pressing (T‐HP), reversed heat‐pressing (R‐HP), traditional file‐splitting with fusion ceramic (T‐FC), reversed file‐splitting with fusion ceramic R‐FC), traditional file‐splitting with resin cement (T‐RC), and reversed file‐splitting with resin cement (R‐RC). The fatigue tests were performed using the stepwise approach at 20 Hz, 10,000 cycles/step, step‐size of 200 N starting at 600 N, and proceeding until failure detection or up to 2600 N if enduring. The failure modes (from radial and/or cone cracks) were analyzed in a stereomicroscope. Results: The reversed design decreased the FFL and CFF of bilayers prepared with heat‐pressing and file‐splitting with fusion ceramic. The T‐HP and T‐FC reached the highest results, which were statistically similar between them. The bilayers prepared by the file‐splitting with resin cement (T‐RC and R‐RC) were similar to the R‐FC and R‐HP groups regarding FFL and CFF. Almost all reverse layering samples failed by radial cracks. Conclusions: The reverse layering design did not improve the fatigue behavior of porcelain veneered zirconia samples. The three bilayer techniques behaved similarly when used in the reversed design. [ABSTRACT FROM AUTHOR]

Published
2024
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