Glass transition and degree of conversion of a light-cured orthodontic composite

Detalhes bibliográficos
Autor(a) principal: Sostena, Michela M.D.S. [UNESP]
Data de Publicação: 2009
Outros Autores: Nogueira, Renata A. [UNESP], Grandini, Carlos R. [UNESP], Moraes, João Carlos Silos [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S1678-77572009000600006
http://hdl.handle.net/11449/225703
Resumo: Objective: This study evaluated the glass transition temperature (Tg) and degree of conversion (DC) of a light-cured (Fill Magic) versus a chemically cured (Concise) orthodontic composite. Material and Methods: Anelastic relaxation spectroscopy was used for the first time to determine the Tg of a dental composite, while the DC was evaluated by infrared spectroscopy. The light-cured composite specimens were irradiated with a commercial LED light-curing unit using different exposure times (40, 90 and 120 s). Results: Fill Magic presented lower Tg than Concise (35-84°C versus 135°C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower Tg than Concise due to its higher organic phase content, and that when this light-cured composite is used to bond orthodontic brackets, a minimum energy density of 7.8 J/cm2 is necessary to reach adequate conversion level and obtain satisfactory adhesion.
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spelling Glass transition and degree of conversion of a light-cured orthodontic compositeDegree of conversionGlass transition temperatureInfra-red spectroscopyMechanical spectroscopyOrthodontic compositeObjective: This study evaluated the glass transition temperature (Tg) and degree of conversion (DC) of a light-cured (Fill Magic) versus a chemically cured (Concise) orthodontic composite. Material and Methods: Anelastic relaxation spectroscopy was used for the first time to determine the Tg of a dental composite, while the DC was evaluated by infrared spectroscopy. The light-cured composite specimens were irradiated with a commercial LED light-curing unit using different exposure times (40, 90 and 120 s). Results: Fill Magic presented lower Tg than Concise (35-84°C versus 135°C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower Tg than Concise due to its higher organic phase content, and that when this light-cured composite is used to bond orthodontic brackets, a minimum energy density of 7.8 J/cm2 is necessary to reach adequate conversion level and obtain satisfactory adhesion.Department of Physics and Chemistry São Paulo State University, Ilha Solteira, SPDepartment of Physics São Paulo State University, Bauru, SPDepartment of Physics and Chemistry São Paulo State University, Ilha Solteira, SPDepartment of Physics São Paulo State University, Bauru, SPUniversidade Estadual Paulista (UNESP)Sostena, Michela M.D.S. [UNESP]Nogueira, Renata A. [UNESP]Grandini, Carlos R. [UNESP]Moraes, João Carlos Silos [UNESP]2022-04-28T20:59:00Z2022-04-28T20:59:00Z2009-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article570-573http://dx.doi.org/10.1590/S1678-77572009000600006Journal of Applied Oral Science, v. 17, n. 6, p. 570-573, 2009.1678-77651678-7757http://hdl.handle.net/11449/22570310.1590/S1678-775720090006000062-s2.0-72549090914Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Applied Oral Scienceinfo:eu-repo/semantics/openAccess2024-07-10T14:08:10Zoai:repositorio.unesp.br:11449/225703Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-06T00:00:24.900380Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Glass transition and degree of conversion of a light-cured orthodontic composite
title Glass transition and degree of conversion of a light-cured orthodontic composite
spellingShingle Glass transition and degree of conversion of a light-cured orthodontic composite
Sostena, Michela M.D.S. [UNESP]
Degree of conversion
Glass transition temperature
Infra-red spectroscopy
Mechanical spectroscopy
Orthodontic composite
title_short Glass transition and degree of conversion of a light-cured orthodontic composite
title_full Glass transition and degree of conversion of a light-cured orthodontic composite
title_fullStr Glass transition and degree of conversion of a light-cured orthodontic composite
title_full_unstemmed Glass transition and degree of conversion of a light-cured orthodontic composite
title_sort Glass transition and degree of conversion of a light-cured orthodontic composite
author Sostena, Michela M.D.S. [UNESP]
author_facet Sostena, Michela M.D.S. [UNESP]
Nogueira, Renata A. [UNESP]
Grandini, Carlos R. [UNESP]
Moraes, João Carlos Silos [UNESP]
author_role author
author2 Nogueira, Renata A. [UNESP]
Grandini, Carlos R. [UNESP]
Moraes, João Carlos Silos [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
dc.contributor.author.fl_str_mv Sostena, Michela M.D.S. [UNESP]
Nogueira, Renata A. [UNESP]
Grandini, Carlos R. [UNESP]
Moraes, João Carlos Silos [UNESP]
dc.subject.por.fl_str_mv Degree of conversion
Glass transition temperature
Infra-red spectroscopy
Mechanical spectroscopy
Orthodontic composite
topic Degree of conversion
Glass transition temperature
Infra-red spectroscopy
Mechanical spectroscopy
Orthodontic composite
description Objective: This study evaluated the glass transition temperature (Tg) and degree of conversion (DC) of a light-cured (Fill Magic) versus a chemically cured (Concise) orthodontic composite. Material and Methods: Anelastic relaxation spectroscopy was used for the first time to determine the Tg of a dental composite, while the DC was evaluated by infrared spectroscopy. The light-cured composite specimens were irradiated with a commercial LED light-curing unit using different exposure times (40, 90 and 120 s). Results: Fill Magic presented lower Tg than Concise (35-84°C versus 135°C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower Tg than Concise due to its higher organic phase content, and that when this light-cured composite is used to bond orthodontic brackets, a minimum energy density of 7.8 J/cm2 is necessary to reach adequate conversion level and obtain satisfactory adhesion.
publishDate 2009
dc.date.none.fl_str_mv 2009-01-01
2022-04-28T20:59:00Z
2022-04-28T20:59:00Z
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/S1678-77572009000600006
Journal of Applied Oral Science, v. 17, n. 6, p. 570-573, 2009.
1678-7765
1678-7757
http://hdl.handle.net/11449/225703
10.1590/S1678-77572009000600006
2-s2.0-72549090914
url http://dx.doi.org/10.1590/S1678-77572009000600006
http://hdl.handle.net/11449/225703
identifier_str_mv Journal of Applied Oral Science, v. 17, n. 6, p. 570-573, 2009.
1678-7765
1678-7757
10.1590/S1678-77572009000600006
2-s2.0-72549090914
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 570-573
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_ 1808129571520774144

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