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 Roberto [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/11449/10066
Resumo: Objective: This study evaluated the glass transition temperature (T(g)) 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 T(g) 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 T(g) than Concise (35-84 degrees C versus 135 degrees C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower T(g) 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/cm(2) 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 compositeOrthodontic compositeGlass transition temperatureDegree of conversionMechanical spectroscopyInfra-red spectroscopyObjective: This study evaluated the glass transition temperature (T(g)) 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 T(g) 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 T(g) than Concise (35-84 degrees C versus 135 degrees C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower T(g) 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/cm(2) is necessary to reach adequate conversion level and obtain satisfactory adhesion.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)São Paulo State Univ, Dept Chem & Phys, Ilha Solteira, SP, BrazilSão Paulo State Univ, Dept Phys, Bauru, SP, BrazilSão Paulo State Univ, Dept Chem & Phys, Ilha Solteira, SP, BrazilSão Paulo State Univ, Dept Phys, Bauru, SP, BrazilUniversidade de São Paulo (USP), Faculdade de Odontologia de BauruUniversidade Estadual Paulista (Unesp)Sostena, Michela M. D. S. [UNESP]Nogueira, Renata A. [UNESP]Grandini, Carlos Roberto [UNESP]Moraes, João Carlos Silos [UNESP]2014-05-20T13:29:45Z2014-05-20T13:29:45Z2009-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article570-573application/pdfhttp://dx.doi.org/10.1590/S1678-77572009000600006Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 17, n. 6, p. 570-573, 2009.1678-7757http://hdl.handle.net/11449/10066S1678-77572009000600006WOS:000272950100006S1678-77572009000600006-en.pdf0000-0002-3336-309XWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of Applied Oral Science1.7090,645info:eu-repo/semantics/openAccess2024-07-10T14:07:13Zoai:repositorio.unesp.br:11449/10066Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:25:24.036930Repositório 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]
Orthodontic composite
Glass transition temperature
Degree of conversion
Mechanical spectroscopy
Infra-red spectroscopy
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 Roberto [UNESP]
Moraes, João Carlos Silos [UNESP]
author_role author
author2 Nogueira, Renata A. [UNESP]
Grandini, Carlos Roberto [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 Roberto [UNESP]
Moraes, João Carlos Silos [UNESP]
dc.subject.por.fl_str_mv Orthodontic composite
Glass transition temperature
Degree of conversion
Mechanical spectroscopy
Infra-red spectroscopy
topic Orthodontic composite
Glass transition temperature
Degree of conversion
Mechanical spectroscopy
Infra-red spectroscopy
description Objective: This study evaluated the glass transition temperature (T(g)) 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 T(g) 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 T(g) than Concise (35-84 degrees C versus 135 degrees C), but reached a higher DC. Conclusions: The results of this study suggest that Fill Magic has lower T(g) 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/cm(2) is necessary to reach adequate conversion level and obtain satisfactory adhesion.
publishDate 2009
dc.date.none.fl_str_mv 2009-11-01
2014-05-20T13:29:45Z
2014-05-20T13:29:45Z
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. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 17, n. 6, p. 570-573, 2009.
1678-7757
http://hdl.handle.net/11449/10066
S1678-77572009000600006
WOS:000272950100006
S1678-77572009000600006-en.pdf
0000-0002-3336-309X
url http://dx.doi.org/10.1590/S1678-77572009000600006
http://hdl.handle.net/11449/10066
identifier_str_mv Journal of Applied Oral Science. Bauru-sp: Univ São Paulo Fac Odontologia Bauru, v. 17, n. 6, p. 570-573, 2009.
1678-7757
S1678-77572009000600006
WOS:000272950100006
S1678-77572009000600006-en.pdf
0000-0002-3336-309X
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of Applied Oral Science
1.709
0,645
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 570-573
application/pdf
dc.publisher.none.fl_str_mv Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru
publisher.none.fl_str_mv Universidade de São Paulo (USP), Faculdade de Odontologia de Bauru
dc.source.none.fl_str_mv Web of Science
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_ 1808128358382305280

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