Hardening of a dual-cure resin cement using QTH and LED curing units
Autor(a) principal: | |
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Data de Publicação: | 2010 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S1678-77572010000200003 http://hdl.handle.net/11449/225890 |
Resumo: | Objective: This study evaluated the surface hardness of a resin cement (RelyX ARC) photoactivated through indirect composite resin (Cristobal) disks of different thicknesses using either a light-emitting diode (LED) or quartz tungsten halogen (QTH) light source. Material and Methods: Eighteen resin cement specimens were prepared and divided into 6 groups according to the type of curing unit and the thickness of resin disks interposed between the cement surface and light source. Three indentations (50 g for 15 s) were performed on the top and bottom surface of each specimen and a mean Vickers hardness number (VHN) was calculated for each specimen. The data were analyzed using two-way ANOVA and Tukey-Kramer test was used for post-hoc pairwise comparisons. Results: Increased indirect resin disk thickness resulted in decreased mean VHN values. Mean VHN values for the top surfaces of the resin cement specimens ranged from 23.2 to 46.1 (QTH) and 32.3 to 41.7 (LED). The LED curing light source produced higher hardness values compared to the QTH light source for 2- and 3-mm-thick indirect resin disks. The differences were clinically, but not statistically significant. Increased indirect resin disk thickness also resulted in decreased mean VHN values for the bottom surfaces of the resin cement: 5.8 to 19.1 (QTH) and 7.5 to 32.0 (LED). For the bottom surfaces, a statistically significant interaction was also found between the type of curing light source and the indirect resin disk thickness. Conclusions: Mean surface hardness values of resin cement specimens decreased with the increase of indirect resin disk thickness. The LED curing light source generally produced higher surface hardness values. |
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Repositório Institucional da UNESP |
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Hardening of a dual-cure resin cement using QTH and LED curing unitsCementsCureHardnessResinObjective: This study evaluated the surface hardness of a resin cement (RelyX ARC) photoactivated through indirect composite resin (Cristobal) disks of different thicknesses using either a light-emitting diode (LED) or quartz tungsten halogen (QTH) light source. Material and Methods: Eighteen resin cement specimens were prepared and divided into 6 groups according to the type of curing unit and the thickness of resin disks interposed between the cement surface and light source. Three indentations (50 g for 15 s) were performed on the top and bottom surface of each specimen and a mean Vickers hardness number (VHN) was calculated for each specimen. The data were analyzed using two-way ANOVA and Tukey-Kramer test was used for post-hoc pairwise comparisons. Results: Increased indirect resin disk thickness resulted in decreased mean VHN values. Mean VHN values for the top surfaces of the resin cement specimens ranged from 23.2 to 46.1 (QTH) and 32.3 to 41.7 (LED). The LED curing light source produced higher hardness values compared to the QTH light source for 2- and 3-mm-thick indirect resin disks. The differences were clinically, but not statistically significant. Increased indirect resin disk thickness also resulted in decreased mean VHN values for the bottom surfaces of the resin cement: 5.8 to 19.1 (QTH) and 7.5 to 32.0 (LED). For the bottom surfaces, a statistically significant interaction was also found between the type of curing light source and the indirect resin disk thickness. Conclusions: Mean surface hardness values of resin cement specimens decreased with the increase of indirect resin disk thickness. The LED curing light source generally produced higher surface hardness values.Department of Restorative Dentistry University Western OntarioDepartment of Dental Materials and Prosthodontics São José dos Campos Dental School São Paulo State University, São José dos Campos, SPDepartment of Dental Materials and Prosthodontics Dental School Federal University of Bahia, Salvador, BADepartment of Dental Materials and Prosthodontics São José dos Campos Dental School São Paulo State University, São José dos Campos, SPUniversity Western OntarioUniversidade Estadual Paulista (UNESP)Universidade Federal da Bahia (UFBA)Santos, Maria Jacinta Moraes CoelhoPassos, Sheila Pestana [UNESP]da Encarnação, Monalisa Olga LessaSantos Junior, Gildo CoelhoBottino, Marco Antonio [UNESP]2022-04-28T21:01:26Z2022-04-28T21:01:26Z2010-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article110-115http://dx.doi.org/10.1590/S1678-77572010000200003Journal of Applied Oral Science, v. 18, n. 2, p. 110-115, 2010.1678-77651678-7757http://hdl.handle.net/11449/22589010.1590/S1678-775720100002000032-s2.0-77953668588Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Applied Oral Scienceinfo:eu-repo/semantics/openAccess2022-04-28T21:01:26Zoai:repositorio.unesp.br:11449/225890Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:20:29.087566Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Hardening of a dual-cure resin cement using QTH and LED curing units |
title |
Hardening of a dual-cure resin cement using QTH and LED curing units |
spellingShingle |
Hardening of a dual-cure resin cement using QTH and LED curing units Santos, Maria Jacinta Moraes Coelho Cements Cure Hardness Resin |
title_short |
Hardening of a dual-cure resin cement using QTH and LED curing units |
title_full |
Hardening of a dual-cure resin cement using QTH and LED curing units |
title_fullStr |
Hardening of a dual-cure resin cement using QTH and LED curing units |
title_full_unstemmed |
Hardening of a dual-cure resin cement using QTH and LED curing units |
title_sort |
Hardening of a dual-cure resin cement using QTH and LED curing units |
author |
Santos, Maria Jacinta Moraes Coelho |
author_facet |
Santos, Maria Jacinta Moraes Coelho Passos, Sheila Pestana [UNESP] da Encarnação, Monalisa Olga Lessa Santos Junior, Gildo Coelho Bottino, Marco Antonio [UNESP] |
author_role |
author |
author2 |
Passos, Sheila Pestana [UNESP] da Encarnação, Monalisa Olga Lessa Santos Junior, Gildo Coelho Bottino, Marco Antonio [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
University Western Ontario Universidade Estadual Paulista (UNESP) Universidade Federal da Bahia (UFBA) |
dc.contributor.author.fl_str_mv |
Santos, Maria Jacinta Moraes Coelho Passos, Sheila Pestana [UNESP] da Encarnação, Monalisa Olga Lessa Santos Junior, Gildo Coelho Bottino, Marco Antonio [UNESP] |
dc.subject.por.fl_str_mv |
Cements Cure Hardness Resin |
topic |
Cements Cure Hardness Resin |
description |
Objective: This study evaluated the surface hardness of a resin cement (RelyX ARC) photoactivated through indirect composite resin (Cristobal) disks of different thicknesses using either a light-emitting diode (LED) or quartz tungsten halogen (QTH) light source. Material and Methods: Eighteen resin cement specimens were prepared and divided into 6 groups according to the type of curing unit and the thickness of resin disks interposed between the cement surface and light source. Three indentations (50 g for 15 s) were performed on the top and bottom surface of each specimen and a mean Vickers hardness number (VHN) was calculated for each specimen. The data were analyzed using two-way ANOVA and Tukey-Kramer test was used for post-hoc pairwise comparisons. Results: Increased indirect resin disk thickness resulted in decreased mean VHN values. Mean VHN values for the top surfaces of the resin cement specimens ranged from 23.2 to 46.1 (QTH) and 32.3 to 41.7 (LED). The LED curing light source produced higher hardness values compared to the QTH light source for 2- and 3-mm-thick indirect resin disks. The differences were clinically, but not statistically significant. Increased indirect resin disk thickness also resulted in decreased mean VHN values for the bottom surfaces of the resin cement: 5.8 to 19.1 (QTH) and 7.5 to 32.0 (LED). For the bottom surfaces, a statistically significant interaction was also found between the type of curing light source and the indirect resin disk thickness. Conclusions: Mean surface hardness values of resin cement specimens decreased with the increase of indirect resin disk thickness. The LED curing light source generally produced higher surface hardness values. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-01-01 2022-04-28T21:01:26Z 2022-04-28T21:01:26Z |
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/10.1590/S1678-77572010000200003 Journal of Applied Oral Science, v. 18, n. 2, p. 110-115, 2010. 1678-7765 1678-7757 http://hdl.handle.net/11449/225890 10.1590/S1678-77572010000200003 2-s2.0-77953668588 |
url |
http://dx.doi.org/10.1590/S1678-77572010000200003 http://hdl.handle.net/11449/225890 |
identifier_str_mv |
Journal of Applied Oral Science, v. 18, n. 2, p. 110-115, 2010. 1678-7765 1678-7757 10.1590/S1678-77572010000200003 2-s2.0-77953668588 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of Applied Oral Science |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
110-115 |
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_ |
1808129054295982080 |