Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process

Detalhes bibliográficos
Autor(a) principal: Guimaraes, Gabriel Felipe [UNESP]
Data de Publicação: 2018
Outros Autores: Marcelino, Edilmar [UNESP], Cesarino, Ivana [UNESP], Vicente, Fabio Bossoi [UNESP], Grandini, Carlos Roberto [UNESP], Simoes, Rafael Plana [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/1678-7757-2017-0528
http://hdl.handle.net/11449/166207
Resumo: High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective: The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In this way, this work proposes a systematic study to determine the optimal dimming function to be applied to light curing processes. Material and Methods: The study was performed by applying mathematical techniques to the optimization of nonlinear objective functions. The effectiveness of the dimming function was evaluated by monitoring the polymerization shrinkage stress during the curing process of five brands/models of composites. This monitoring was performed on a universal testing machine using two steel bases coupled in the arms of the machine where the resin was inserted and polymerized. The quality of the composites cured by the proposed method was analyzed and compared with the conventional photoactivation method by experiments to determine their degree of conversion (DC). Absorbance measurements were performed using Fourier-transform infrared spectroscopy (FT-IR). A T-test was performed on DC results to compare the photoactivation techniques. We also used scanning electron microscopy (SEM) to analyze in-vitro the adhesion interface of the resin in human teeth. Results: Our results showed that the use of the optimal dimming function, named as exponential, resulted in the significant reduction of the shrinkage stress (similar to 36.88% +/- 6.56 when compared with the conventional method) without affecting the DC (t=0.86, p-value=0.44). The SEM analyses show that the proposed process can minimize or even eliminate adhesion failures between the tooth and the resin in dental restorations. Conclusion: The results from this study can promote the improvement of the composite resin light curing process by the minimization of polymerization shrinkage effects, given an operational standardization of the photoactivation process.
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spelling Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation processDental restorationComposite resinsLight-curing of dental adhesivesHigh levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective: The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In this way, this work proposes a systematic study to determine the optimal dimming function to be applied to light curing processes. Material and Methods: The study was performed by applying mathematical techniques to the optimization of nonlinear objective functions. The effectiveness of the dimming function was evaluated by monitoring the polymerization shrinkage stress during the curing process of five brands/models of composites. This monitoring was performed on a universal testing machine using two steel bases coupled in the arms of the machine where the resin was inserted and polymerized. The quality of the composites cured by the proposed method was analyzed and compared with the conventional photoactivation method by experiments to determine their degree of conversion (DC). Absorbance measurements were performed using Fourier-transform infrared spectroscopy (FT-IR). A T-test was performed on DC results to compare the photoactivation techniques. We also used scanning electron microscopy (SEM) to analyze in-vitro the adhesion interface of the resin in human teeth. Results: Our results showed that the use of the optimal dimming function, named as exponential, resulted in the significant reduction of the shrinkage stress (similar to 36.88% +/- 6.56 when compared with the conventional method) without affecting the DC (t=0.86, p-value=0.44). The SEM analyses show that the proposed process can minimize or even eliminate adhesion failures between the tooth and the resin in dental restorations. Conclusion: The results from this study can promote the improvement of the composite resin light curing process by the minimization of polymerization shrinkage effects, given an operational standardization of the photoactivation process.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Univ Estadual Paulista, Fac Ciencias Agron, Dept Bioproc & Biotecnol, Botucatu, SP, BrazilUniv Estadual Paulista, Inst Biociencias, Botucatu, SP, BrazilUniv Estadual Paulista, Fac Ciencias, Lab Relaxacoes Anelast & Biomat, Bauru, SP, BrazilInst Biomat Tribocorrosao & Nanomed Ramo Brasilei, Bauru, SP, BrazilUniv Estadual Paulista, Fac Ciencias Agron, Dept Bioproc & Biotecnol, Botucatu, SP, BrazilUniv Estadual Paulista, Inst Biociencias, Botucatu, SP, BrazilUniv Estadual Paulista, Fac Ciencias, Lab Relaxacoes Anelast & Biomat, Bauru, SP, BrazilFAPESP: 2015/02136-2Univ Sao Paulo Fac Odontologia BauruUniversidade Estadual Paulista (Unesp)Inst Biomat Tribocorrosao & Nanomed Ramo BrasileiGuimaraes, Gabriel Felipe [UNESP]Marcelino, Edilmar [UNESP]Cesarino, Ivana [UNESP]Vicente, Fabio Bossoi [UNESP]Grandini, Carlos Roberto [UNESP]Simoes, Rafael Plana [UNESP]2018-11-29T19:30:24Z2018-11-29T19:30:24Z2018-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article9application/pdfhttp://dx.doi.org/10.1590/1678-7757-2017-0528Journal Of Applied Oral Science. Bauru-sp: Univ Sao Paulo Fac Odontologia Bauru, v. 26, 9 p., 2018.1678-7757http://hdl.handle.net/11449/16620710.1590/1678-7757-2017-0528S1678-77572018000100473WOS:000435642600001S1678-77572018000100473.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Applied Oral Scienceinfo:eu-repo/semantics/openAccess2024-04-25T17:40:30Zoai:repositorio.unesp.br:11449/166207Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:42:00.056791Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
title Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
spellingShingle Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
Guimaraes, Gabriel Felipe [UNESP]
Dental restoration
Composite resins
Light-curing of dental adhesives
title_short Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
title_full Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
title_fullStr Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
title_full_unstemmed Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
title_sort Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
author Guimaraes, Gabriel Felipe [UNESP]
author_facet Guimaraes, Gabriel Felipe [UNESP]
Marcelino, Edilmar [UNESP]
Cesarino, Ivana [UNESP]
Vicente, Fabio Bossoi [UNESP]
Grandini, Carlos Roberto [UNESP]
Simoes, Rafael Plana [UNESP]
author_role author
author2 Marcelino, Edilmar [UNESP]
Cesarino, Ivana [UNESP]
Vicente, Fabio Bossoi [UNESP]
Grandini, Carlos Roberto [UNESP]
Simoes, Rafael Plana [UNESP]
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Inst Biomat Tribocorrosao & Nanomed Ramo Brasilei
dc.contributor.author.fl_str_mv Guimaraes, Gabriel Felipe [UNESP]
Marcelino, Edilmar [UNESP]
Cesarino, Ivana [UNESP]
Vicente, Fabio Bossoi [UNESP]
Grandini, Carlos Roberto [UNESP]
Simoes, Rafael Plana [UNESP]
dc.subject.por.fl_str_mv Dental restoration
Composite resins
Light-curing of dental adhesives
topic Dental restoration
Composite resins
Light-curing of dental adhesives
description High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. Objective: The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In this way, this work proposes a systematic study to determine the optimal dimming function to be applied to light curing processes. Material and Methods: The study was performed by applying mathematical techniques to the optimization of nonlinear objective functions. The effectiveness of the dimming function was evaluated by monitoring the polymerization shrinkage stress during the curing process of five brands/models of composites. This monitoring was performed on a universal testing machine using two steel bases coupled in the arms of the machine where the resin was inserted and polymerized. The quality of the composites cured by the proposed method was analyzed and compared with the conventional photoactivation method by experiments to determine their degree of conversion (DC). Absorbance measurements were performed using Fourier-transform infrared spectroscopy (FT-IR). A T-test was performed on DC results to compare the photoactivation techniques. We also used scanning electron microscopy (SEM) to analyze in-vitro the adhesion interface of the resin in human teeth. Results: Our results showed that the use of the optimal dimming function, named as exponential, resulted in the significant reduction of the shrinkage stress (similar to 36.88% +/- 6.56 when compared with the conventional method) without affecting the DC (t=0.86, p-value=0.44). The SEM analyses show that the proposed process can minimize or even eliminate adhesion failures between the tooth and the resin in dental restorations. Conclusion: The results from this study can promote the improvement of the composite resin light curing process by the minimization of polymerization shrinkage effects, given an operational standardization of the photoactivation process.
publishDate 2018
dc.date.none.fl_str_mv 2018-11-29T19:30:24Z
2018-11-29T19:30:24Z
2018-01-01
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/10.1590/1678-7757-2017-0528
Journal Of Applied Oral Science. Bauru-sp: Univ Sao Paulo Fac Odontologia Bauru, v. 26, 9 p., 2018.
1678-7757
http://hdl.handle.net/11449/166207
10.1590/1678-7757-2017-0528
S1678-77572018000100473
WOS:000435642600001
S1678-77572018000100473.pdf
url http://dx.doi.org/10.1590/1678-7757-2017-0528
http://hdl.handle.net/11449/166207
identifier_str_mv Journal Of Applied Oral Science. Bauru-sp: Univ Sao Paulo Fac Odontologia Bauru, v. 26, 9 p., 2018.
1678-7757
10.1590/1678-7757-2017-0528
S1678-77572018000100473
WOS:000435642600001
S1678-77572018000100473.pdf
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 9
application/pdf
dc.publisher.none.fl_str_mv Univ Sao Paulo Fac Odontologia Bauru
publisher.none.fl_str_mv Univ Sao Paulo Fac Odontologia 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
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