Minimization of polymerization shrinkage effects on composite resins by the control of irradiance during the photoactivation process
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , |
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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Repositório Institucional da UNESP |
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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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1808129543979925504 |