Shrinkage stress and temperature variation in resin composites cured via different photoactivation methods: Insights for standardisation of the photopolymerisation

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dc.contributor.authorSousa, Guilherme dos Santos [UNESP]
dc.contributor.authorGuimarães, Gabriel Felipe [UNESP]
dc.contributor.authorMarcelino, Edilmar [UNESP]
dc.contributor.authorRodokas, José Eduardo Petit [UNESP]
dc.contributor.authorJúnior, Arilson José de Oliveira [UNESP]
dc.contributor.authorCesarino, Ivana [UNESP]
dc.contributor.authorLeão, Alcides Lopes [UNESP]
dc.contributor.authorRiccardi, Carla dos Santos [UNESP]
dc.contributor.authorArjmand, Mohammad
dc.contributor.authorSimões, Rafael Plana [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of British Columbia (UBC)
dc.date.accessioned2022-05-01T06:02:11Z
dc.date.available2022-05-01T06:02:11Z
dc.date.issued2021-07-01
dc.description.abstractThe literature has shown that there is no consensus regarding the best resin composite photoactivation protocol. This study evaluated the efficiency of the conventional, soft-start, pulse-delay and exponential protocols for photoactivation of resin composites in reducing the shrinkage stress and temperature variation during the photopolymerisation. The photoactivation processes were performed using a photocuring unit and a smartphone app developed to control the irradiance according each photoactivation protocol. These photoactivation methods were evaluated applying photoactivation energies recommended by the resins manufactures. Three brands of resin composites were analysed: Z-250, Charisma and Ultrafill. The cure effectiveness was evaluated through depth of cure experiments. All results were statistically evaluated using one-way and multi-factor analysis of variance (ANOVA). The use of exponential and pulse-delay methods resulted in a significant reduction of the shrinkage stress for all evaluated resins; however, the pulse-delay method required too long a photoactivation time. The increases on the temperature were lower when the exponential photoactivation was applied; however, the temperature variation for all photoactivation protocols was not enough to cause damage in the restoration area. The evaluation of the depth of cure showed that all photoactivation protocols resulted in cured resins with equivalent hardness, indicating that the choice of an alternative photoactivation protocol did not harm the polymerisation. In this way, the results showed the exponential protocol as the best photoactivation technique for practical applications.en
dc.description.affiliationMedical School Sao Paulo State University (UNESP), Avenue Prof. Mário Rubens Guimarães Montenegro, s/n
dc.description.affiliationDepartment of Bioprocess and Biotechnology School of Agriculture Sao Paulo State University (UNESP), Street José Barbosa de Barros, 1780
dc.description.affiliationSchool of Engineering Sao Paulo State University (UNESP), Avenue Eng. Luiz Edmundo Carrijo Coube, 14-01
dc.description.affiliationSchool of Engineering University of British Columbia (UBC), 3333 University Way
dc.description.affiliationUnespMedical School Sao Paulo State University (UNESP), Avenue Prof. Mário Rubens Guimarães Montenegro, s/n
dc.description.affiliationUnespDepartment of Bioprocess and Biotechnology School of Agriculture Sao Paulo State University (UNESP), Street José Barbosa de Barros, 1780
dc.description.affiliationUnespSchool of Engineering Sao Paulo State University (UNESP), Avenue Eng. Luiz Edmundo Carrijo Coube, 14-01
dc.description.sponsorshipUniversidade Estadual Paulista
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdUniversidade Estadual Paulista: 05/2021-PROPG
dc.description.sponsorshipIdFAPESP: 2017/08188-0
dc.description.sponsorshipIdFAPESP: 2021/05045-9
dc.identifierhttp://dx.doi.org/10.3390/polym13132065
dc.identifier.citationPolymers, v. 13, n. 13, 2021.
dc.identifier.doi10.3390/polym13132065
dc.identifier.issn2073-4360
dc.identifier.scopus2-s2.0-85109142860
dc.identifier.urihttp://hdl.handle.net/11449/233229
dc.language.isoeng
dc.relation.ispartofPolymers
dc.sourceScopus
dc.subjectDental restoration failure
dc.subjectLight-curing of dental adhesives
dc.subjectLight-curing of dental resins
dc.subjectPhotoactivation protocol
dc.subjectSynthetic resins
dc.titleShrinkage stress and temperature variation in resin composites cured via different photoactivation methods: Insights for standardisation of the photopolymerisationen
dc.typeArtigo
unesp.departmentEngenharia Rural - FCApt

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Botucatu - FCA - Faculdade de Ciências Agronômicas