How does the occlusal contact region influence the mechanical fatigue performance and fracture region of monolithic lithium disilicate ceramic crowns?

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Autor(es): dc.contributorUniversidade Federal de Sergipe (UFS)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorVelho, Helder Callegaro-
Autor(es): dc.creatorda Rosa, Lucas Saldanha-
Autor(es): dc.creatorDapieve, Kiara Serafini-
Autor(es): dc.creatorBorges, Alexandre Luiz Souto-
Autor(es): dc.creatorPereira, Gabriel Kalil Rocha-
Autor(es): dc.creatorVenturini, Andressa Borin-
Autor(es): dc.creatorValandro, Luiz Felipe-
Data de aceite: dc.date.accessioned2025-08-21T16:43:27Z-
Data de disponibilização: dc.date.available2025-08-21T16:43:27Z-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-07-29-
Data de envio: dc.date.issued2023-04-01-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jmbbm.2023.105746-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/248451-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/248451-
Descrição: dc.descriptionObjective: To characterize the effect of the occlusal contact region on the mechanical fatigue performance and on the fracture region of monolithic lithium disilicate ceramic crowns. Materials and methods: Monolithic lithium disilicate ceramic crowns were machined in a CAD/CAM system and adhesively luted onto glass-fiber reinforced epoxy resin preparations with resin cement. The crowns were divided into three groups (n = 16) according to load application region (cusp tip: restricted to cusp tips; cusp plane: restricted to cuspal inclined plane; or mixed: associating tip cusp and cuspal inclined plane). The specimens were submitted to a cyclic fatigue test (initial load: 200 N; step-size: 100 N; cycles/step: 20,000; loading frequency: 20 Hz; load applicator: 6 mm or 40 mm diameter stainless steel) until observing cracks (1st outcome) and fracture (2nd outcome). The data were analyzed by the Kaplan-Meier + Mantel-Cox post-hoc tests for both outcomes (cracks and fracture). Finite element analysis (FEA), occlusal contact region, contact radii measurements, and fractographic analyzes were performed. Results: The mixed group presented worse fatigue mechanical behavior (550 N / 85.000 cycles) compared to the cuspal inclined plane group (656 N / 111,250 cycles) (p < 0.05) for the first crack outcome, while the cusp tip group was similar to both groups (588 N / 97,500 cycles) (p > 0.05). The mixed group had the worst fatigue behavior (1413 N / 253,029 cycles) in relation to the other groups (Cusp tip: 1644 N / 293,312 cycles; Cuspal inclined plane: 1631 N / 295,174 cycles) considering the crown fracture outcome (p < 0.05). FEA showed higher tensile stress concentration areas just below the load application region. In addition, loading on the cuspal inclined plane induced a higher tensile stress concentration in the groove region. The most prevalent type of crown fracture was the wall fracture. Groove fracture was observed in 50% of the loading specimens exclusively on the cuspal inclined plane. Conclusion: Load application on distinct occlusal contact regions affects the stress distribution pattern and consequently the mechanical fatigue performance and fracture region of the monolithic lithium disilicate ceramic crowns. A combination of loading at distinct regions is recommended to promote better evaluation of the fatigue behavior of a restored set.-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul-
Descrição: dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)-
Descrição: dc.descriptionMSciD and Ph.D. Post-Graduate Program in Oral Sciences Faculty of Dentistry Federal University of Santa Maria (UFSM), Rio Grande do Sul State-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics São Paulo State University, São José dos Campos-
Descrição: dc.descriptionDepartment of Dental Materials and Prosthodontics São Paulo State University, São José dos Campos-
Descrição: dc.descriptionCAPES: 001-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul: 18/2551-0000520-7-
Descrição: dc.descriptionFundação de Amparo à Pesquisa do Estado do Rio Grande do Sul: 19/2551-0001221-7-
Idioma: dc.languageen-
Relação: dc.relationJournal of the Mechanical Behavior of Biomedical Materials-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectDental ceramics-
Palavras-chave: dc.subjectFatigue-
Palavras-chave: dc.subjectFracture-
Palavras-chave: dc.subjectLoading pattern-
Título: dc.titleHow does the occlusal contact region influence the mechanical fatigue performance and fracture region of monolithic lithium disilicate ceramic crowns?-
Tipo de arquivo: dc.typelivro digital-
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