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dc.contributor.author
Asmussen, Silvana Valeria
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dc.contributor.author
Arenas, Gustavo Francisco
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dc.contributor.author
Cook, Wayne D.
dc.contributor.author
Vallo, Claudia Ines
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dc.date.available
2018-12-07T17:10:47Z
dc.date.issued
2009-12-16
dc.identifier.citation
Asmussen, Silvana Valeria; Arenas, Gustavo Francisco; Cook, Wayne D.; Vallo, Claudia Ines; Photobleaching of camphorquinone during polymerization of dimethacrylate-based resins; Elsevier; Dental Materials; 25; 12; 16-12-2009; 1603-1611
dc.identifier.issn
0109-5641
dc.identifier.uri
http://hdl.handle.net/11336/66062
dc.description.abstract
Objective: The aim of this study was to compare the photobleaching rate of CQ in different dental resins. Methods: The photodecomposition rate of CQ/amine system in bis-GMA/TEGDMA, bis-EMA and UDMA polymerizing monomers was evaluated at different light intensities. The photobleaching of the CQ was studied by monitoring the decrease in light absorption as a function of continuous irradiation time. The absorption changes were assessed by recording the transmitted light that passed through samples of monomers containing CQ/amine. Results: Complete photobleaching of CQ was observed in all the monomer tested and the rate constant for the photobleaching was proportional to the radiation intensity. Hydrogen abstraction from amines by the excited CQ state via electron transfer and direct hydrogen abstraction from monomer structures were involved in the CQ photoreduction. CQ was photobleached in the absence of coinitiator in a dimethacrylate monomer containing a carbamate functional group (UDMA). This behavior was attributed to the presence of labile hydrogen atoms in the UDMA monomer. The CQ photobleaching rate constant in UDMA containing CQ/amine was similar to that in UDMA in the absence of amine. Moreover, the efficiency of CQ to photoinitiate the polymerization of UDMA in the absence of amine demonstrated that the radicals derived from the UDMA monomer via hydrogen abstraction are highly reactive toward double bonds. Significance: CQ photoinitiates the polymerization of the UDMA monomer in the absence of amine and the efficiency of this process is comparable to that of traditional bis-GMA and bis-EMA monomers activated with CQ/amine. © 2009 Academy of Dental Materials.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Camphorquinone
dc.subject
Dimethacrylates
dc.subject
Photobleaching
dc.subject
Photopolymerization
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica
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dc.subject.classification
Ciencias Químicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Photobleaching of camphorquinone during polymerization of dimethacrylate-based resins
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-11-22T15:31:17Z
dc.journal.volume
25
dc.journal.number
12
dc.journal.pagination
1603-1611
dc.journal.pais
Países Bajos
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dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Asmussen, Silvana Valeria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Instituto de Investigación en Ciencia y Tecnología; Argentina
dc.description.fil
Fil: Arenas, Gustavo Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Universidad Nacional de Mar del Plata. Facultad de Ingeniería. Departamento de Física; Argentina
dc.description.fil
Fil: Cook, Wayne D.. Monash University; Australia
dc.description.fil
Fil: Vallo, Claudia Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina. Instituto de Investigación en Ciencia y Tecnología; Argentina
dc.journal.title
Dental Materials
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0109564109002851
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.dental.2009.08.010
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