Residual stresses explaining clinical fractures of bilayer zirconia and lithium disilicate crowns: A VFEM study

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversity of Connecticut-
Autor(es): dc.contributorFederal University of Santa Maria-
Autor(es): dc.contributorUniversity of Pennsylvania-
Autor(es): dc.creatorRodrigues, Camila S.-
Autor(es): dc.creatorDhital, Sukirti-
Autor(es): dc.creatorKim, Jeongho-
Autor(es): dc.creatorMay, Liliana Gressler-
Autor(es): dc.creatorWolff, Mark S.-
Autor(es): dc.creatorZhang, Yu-
Data de aceite: dc.date.accessioned2025-08-21T21:39:30Z-
Data de disponibilização: dc.date.available2025-08-21T21:39:30Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2020-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.dental.2021.08.019-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/229455-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/229455-
Descrição: dc.descriptionObjective: To understand the stress development in porcelain-veneered zirconia (PVZ) and porcelain-veneered lithium disilicate (PVLD) crowns with different veneer/core thickness ratios and cooling rates. To provide design guidelines for better performing bilayer restorations with the aid of Viscoelastic Finite Element Method (VFEM). Methods: The VFEM was validated by comparing the predicted residual stresses with experimental measurements. Then, the model was used to predict transient and residual stresses in the two bilayer systems. Models with two different veneer/core thickness ratios were prepared (2:1 and 1:1) and two cooling protocols were simulated (Fast: ∼300 °C/min, Slow: ∼30 °C/min) using the heat transfer module, followed by stress analysis in ABAQUS. The physical properties of zirconia, lithium disilicate, and the porcelains used for the simulations were determined as a function of temperature. Results: PVLD showed lower residual stresses than PVZ. The maximum tensile stresses in PVZ were observed in the cusp area, whereas those in PVLD were located in the central fossa. The 1:1 thickness ratio decreased stresses in both layers of PVZ. Slow cooling slightly decreased residual stresses in both systems. However, the cooling rate effect was more evident in transient stresses. Significance: Slow cooling is preferable for both systems. A thinner porcelain layer over zirconia lowers stresses throughout the restoration. The different stress distributions between PVZ and PVLD may affect their failure modes. Smaller mismatches in modulus, CTE, and specific heat between the constituents, and the use of low Tg porcelains can effectively reduce the deleterious transient and residual tensile stresses in bilayer restorations.-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University, 777 Eng. Francisco José Longo Av, São José dos Campos-
Descrição: dc.descriptionDepartment of Civil and Environmental Engineering University of Connecticut, 261 Glenbrook Rd., U-3037-
Descrição: dc.descriptionDepartment of Restorative Dentistry School of Dentistry Federal University of Santa Maria, 1000 Roraima Av., T Street, Building 26F-
Descrição: dc.descriptionDepartment of Preventive and Restorative Sciences School of Dental Medicine University of Pennsylvania, 240 S. 40th Street-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University, 777 Eng. Francisco José Longo Av, São José dos Campos-
Idioma: dc.languageen-
Relação: dc.relationDental Materials-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectBilayer crowns-
Palavras-chave: dc.subjectCoefficient of thermal expansion-
Palavras-chave: dc.subjectCooling rate-
Palavras-chave: dc.subjectDental ceramics-
Palavras-chave: dc.subjectElastic modulus-
Palavras-chave: dc.subjectResidual stress-
Palavras-chave: dc.subjectSpecific heat-
Palavras-chave: dc.subjectTransient stress-
Título: dc.titleResidual stresses explaining clinical fractures of bilayer zirconia and lithium disilicate crowns: A VFEM study-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

Não existem arquivos associados a este item.