Could light-curing time, post-space region and cyclic fatigue affect the nanomechanical behavior of a dual-curing cement for fiber post luting?

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Autor(es): dc.contributorPolitecnico di Torino-
Autor(es): dc.contributorDental School-
Autor(es): dc.contributorUniversity of Bologna-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorSerino, Gianpaolo-
Autor(es): dc.creatorComba, Allegra-
Autor(es): dc.creatorBaldi, Andrea-
Autor(es): dc.creatorCarossa, Massimo-
Autor(es): dc.creatorBaldissara, Paolo-
Autor(es): dc.creatorBignardi, Cristina-
Autor(es): dc.creatorAudenino, Alberto-
Autor(es): dc.creatorTorres, Carlos Gomes Rocha-
Autor(es): dc.creatorScotti, Nicola-
Data de aceite: dc.date.accessioned2025-08-21T20:53:25Z-
Data de disponibilização: dc.date.available2025-08-21T20:53:25Z-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2022-04-28-
Data de envio: dc.date.issued2021-12-31-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1016/j.jmbbm.2021.104886-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/222723-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/222723-
Descrição: dc.descriptionObjective: To evaluate the effects of curing time, post-space region and cyclic fatigue on the micromechanical properties of a fiber-post luting cement. The null hypotheses were that (1) curing time, (2) fatigue and (3) post-space region does not affect the nanoindentation modulus and hardness of the dual-curing cement. Materials and methods: 48 premolars were endodontically treated and a class I cavity and 8 mm deep post space was prepared. Fiber posts were luted with a universal, dualized adhesive system and a dual-curing cement following manufacturer's instructions. Specimens were divided into three groups (16 specimens for each group) according to light-curing time (no light-curing, 20 s light-curing and 120 s light-curing), which was performed with a LED lamp at 1000 mW/cm 2. The coronal part of the cavity was restored using a nano-filled resin composite. After 24 h, 8 specimens for each group were randomly extract in order to undergo to fatigue test in wet condition through a chewing simulator, while the other specimens were kept in distilled water as benchmark. All the restored teeth were then sectioned in 1 mm thick slices perpendicularly to the fiber post axis. Specimen slices were classified in coronal and apical to be tested through a nanoindenter. Data were analyzed through Kruskal-Wallis test with a significance level of 1%, in order to evaluate the influence of treatments (i.e., curing time and cyclic loading) on the micromechanical properties of the tested luting cement. Results: Both fatigue and curing time significantly influenced nanoindentation modulus and hardness of dual-curing cement (p < 0.01). No significant differences were reported for post space region. A significant interaction was found among the analyzed factors (p < 0.01). Significance: 120 s light-curing time is recommended in order to achieve optimal mechanical proprieties, independently from post space region and cyclic fatigue. As matter of fact, 120 s light-curing allowed to prevent strain hardening induced by the fatigue simulation.-
Descrição: dc.descriptionDepartment of Mechanical and Aerospace Engineering Politecnico di Torino-
Descrição: dc.descriptionPolito BIO Med Lab Politecnico di Torino-
Descrição: dc.descriptionDepartment of Surgical Sciences Dental School-
Descrição: dc.descriptionDepartment of Biomedical and Neuromotor Sciences University of Bologna-
Descrição: dc.descriptionDepartment of Restorative Dentistry Sao Paulo State University – UNESP-
Descrição: dc.descriptionDepartment of Restorative Dentistry Sao Paulo State University – UNESP-
Idioma: dc.languageen-
Relação: dc.relationJournal of the Mechanical Behavior of Biomedical Materials-
???dc.source???: dc.sourceScopus-
Palavras-chave: dc.subjectDual-curing cement-
Palavras-chave: dc.subjectFatigue-
Palavras-chave: dc.subjectFiber-post-
Palavras-chave: dc.subjectMechanical properties-
Palavras-chave: dc.subjectNanoindentation-
Título: dc.titleCould light-curing time, post-space region and cyclic fatigue affect the nanomechanical behavior of a dual-curing cement for fiber post luting?-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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