Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites
Autor(a) principal: | |
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Data de Publicação: | 2021 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1111/eos.12825 http://hdl.handle.net/11449/233863 |
Resumo: | This 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. |
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Repositório Institucional da UNESP |
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Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill compositesThis 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.Department of Operative Dentistry Endodontics and Dental Materials Bauru School of Dentistry University of São Paulo-USPFaculty of Science Department of Mathematics São Paulo State University-UNESPDepartment of Pediatric Dentistry Orthodontics and Public Health Bauru School of Dentistry University of São Paulo-USPFaculty of Science Department of Mathematics São Paulo State University-UNESPUniversidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)Santin, Daniella CristoVelo, Marilia Mattar de Amoêdo CamposCamim, Francielly da SilvaBrondino, Nair Cristina Margarido [UNESP]Honório, Heitor MarquesMondelli, Rafael Francisco Lia2022-05-01T11:07:34Z2022-05-01T11:07:34Z2021-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1111/eos.12825European Journal of Oral Sciences, v. 129, n. 6, 2021.1600-07220909-8836http://hdl.handle.net/11449/23386310.1111/eos.128252-s2.0-85120472983Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEuropean Journal of Oral Sciencesinfo:eu-repo/semantics/openAccess2024-04-29T14:59:54Zoai:repositorio.unesp.br:11449/233863Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:35:54.764809Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
title |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
spellingShingle |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites Santin, Daniella Cristo |
title_short |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
title_full |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
title_fullStr |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
title_full_unstemmed |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
title_sort |
Effect of thickness on shrinkage stress and bottom-to-top hardness ratio of conventional and bulk-fill composites |
author |
Santin, Daniella Cristo |
author_facet |
Santin, Daniella Cristo Velo, Marilia Mattar de Amoêdo Campos Camim, Francielly da Silva Brondino, Nair Cristina Margarido [UNESP] Honório, Heitor Marques Mondelli, Rafael Francisco Lia |
author_role |
author |
author2 |
Velo, Marilia Mattar de Amoêdo Campos Camim, Francielly da Silva Brondino, Nair Cristina Margarido [UNESP] Honório, Heitor Marques Mondelli, Rafael Francisco Lia |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (UNESP) |
dc.contributor.author.fl_str_mv |
Santin, Daniella Cristo Velo, Marilia Mattar de Amoêdo Campos Camim, Francielly da Silva Brondino, Nair Cristina Margarido [UNESP] Honório, Heitor Marques Mondelli, Rafael Francisco Lia |
description |
This 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. |
publishDate |
2021 |
dc.date.none.fl_str_mv |
2021-12-01 2022-05-01T11:07:34Z 2022-05-01T11:07:34Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1111/eos.12825 European Journal of Oral Sciences, v. 129, n. 6, 2021. 1600-0722 0909-8836 http://hdl.handle.net/11449/233863 10.1111/eos.12825 2-s2.0-85120472983 |
url |
http://dx.doi.org/10.1111/eos.12825 http://hdl.handle.net/11449/233863 |
identifier_str_mv |
European Journal of Oral Sciences, v. 129, n. 6, 2021. 1600-0722 0909-8836 10.1111/eos.12825 2-s2.0-85120472983 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
European Journal of Oral Sciences |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129534731485184 |