Fatigue behavior of multilayer ceramic structures in traditional and reverse layering designs

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF PROSTHODONTICS-IMPLANT ESTHETIC AND RECONSTRUCTIVE DENTISTRY; v. N/A, p. 7-pg., 2023-06-05.

Resumo

PurposeThis 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 MethodsZirconia 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. ResultsThe 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. ConclusionsThe 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. (AU)

• Processo FAPESP: 20/15720-2 - Aplicação de glaze contendo prata em alta temperatura sobre zircônias de 3ª geração: efeitos na carga para falha em fadiga, translucidez e capacidade de mascaramento
• Beneficiário: Camila da Silva Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 19/21736-1 - Infiltrações de vidro com prata em zircônia odontológica para melhores propriedades mecânicas e antimicrobianas
• Beneficiário: Renata Marques de Melo Marinho
• Modalidade de apoio: Auxílio à Pesquisa - Regular