Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites

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Autor(es): dc.contributorUniversidade de São Paulo (USP)-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorSantin, Daniella Cristo-
Autor(es): dc.creatorVelo, Marilia Mattar de Amoêdo Campos-
Autor(es): dc.creatorCamim, Francielly da Silva-
Autor(es): dc.creatorBrondino, Nair Cristina Margarido-
Autor(es): dc.creatorHonório, Heitor Marques-
Autor(es): dc.creatorMondelli, Rafael Francisco Lia-
Data de aceite: dc.date.accessioned2025-08-21T22:56:24Z-
Data de disponibilização: dc.date.available2025-08-21T22:56:24Z-
Data de envio: dc.date.issued2022-05-01-
Data de envio: dc.date.issued2022-05-01-
Data de envio: dc.date.issued2021-11-30-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.1111/eos.12825-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/233863-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/233863-
Descrição: dc.descriptionThis study evaluated the effect of the material thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites. Six commercial composites were selected based on their different technologies: Two conventional (C1, C2), two high-viscosity bulk-fill (HVB1, HVB2), and two low-viscosity bulk-fill (LVB1, LVB2). Shrinkage stress was analyzed for five specimens with 2 mm thickness (C-factor 0.75 and volume 24 mm3) and five specimens with 4 mm thickness (C-factor 0.375 and volume 48 mm3) for 300 s in a universal testing machine. Bottom-to-top hardness ratio values were obtained from Knoop microhardness measurements in specimens with 2- and 4-mm thickness (n = 5). Thickness increase resulted in significantly higher shrinkage stress for all materials with the exception of HVB2 and LVB1. C1, C2, HVB2, and LVB1 showed lower bottom-to-top hardness ratios at 4 mm than at 2 mm. Only LVB2 presented a bottom-to-top hardness ratio lower than 80% at 2 mm, while HVB1 surpassed this threshold at 4 mm of depth. The results suggest that the increase of composite thickness affected the shrinkage stress values. Also, thickness increase resulted in lower bottom-to-top hardness ratio. HVB1 showed better behavior than other bulk-fill materials, with low stress and adequate bottom-to-top hardness ratio at 4 mm thickness.-
Descrição: dc.descriptionDepartment of Operative Dentistry Endodontics and Dental Materials Bauru School of Dentistry University of São Paulo-USP-
Descrição: dc.descriptionFaculty of Science Department of Mathematics São Paulo State University-UNESP-
Descrição: dc.descriptionDepartment of Pediatric Dentistry Orthodontics and Public Health Bauru School of Dentistry University of São Paulo-USP-
Descrição: dc.descriptionFaculty of Science Department of Mathematics São Paulo State University-UNESP-
Idioma: dc.languageen-
Relação: dc.relationEuropean Journal of Oral Sciences-
???dc.source???: dc.sourceScopus-
Título: dc.titleEffect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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