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http://acervodigital.unesp.br/handle/11449/16698
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DC Field | Value | Language |
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dc.contributor.author | Costa, S. X. S. | - |
dc.contributor.author | Martins, L. M. | - |
dc.contributor.author | Franscisconi, P. A. S. | - |
dc.contributor.author | Bagnato, V. S. | - |
dc.contributor.author | Saad, José Roberto Cury | - |
dc.contributor.author | Rastelli, Alessandra Nara de Souza | - |
dc.contributor.author | Andrade, M. F. | - |
dc.date.accessioned | 2014-05-20T13:47:03Z | - |
dc.date.accessioned | 2016-10-25T17:00:34Z | - |
dc.date.available | 2014-05-20T13:47:03Z | - |
dc.date.available | 2016-10-25T17:00:34Z | - |
dc.date.issued | 2009-12-01 | - |
dc.identifier | http://dx.doi.org/10.1134/S1054660X09230066 | - |
dc.identifier.citation | Laser Physics. New York: Maik Nauka/interperiodica/springer, v. 19, n. 12, p. 2210-2218, 2009. | - |
dc.identifier.issn | 1054-660X | - |
dc.identifier.uri | http://hdl.handle.net/11449/16698 | - |
dc.identifier.uri | http://acervodigital.unesp.br/handle/11449/16698 | - |
dc.description.abstract | The purpose of this study was to evaluate the influence of different light sources and photo-activation methods on degree of conversion (DC%) and polymerization shrinkage (PS) of a nanocomposite resin (Filtek (TM) Supreme XT, 3M/ESPE). Two light-curing units (LCUs), one halogen-lamp (QTH) and one light-emitting-diode (LED), and two different photo-activation methods (continuous and gradual) were investigated in this study. The specimens were divided in four groups: group 1-power density (PD) of 570 mW/cm(2) for 20 s (QTH); group 2-PD 0 at 570 mW/cm(2) for 10 s + 10 s at 570 mW/cm(2) (QTH); group 3-PD 860 mW/cm(2) for 20 s (LED), and group 4-PD 125 mW/cm(2) for 10 s + 10 s at 860 mW/cm(2) (LED). A testing machine EMIC with rectangular steel bases (6 x 1 x 2 mm) was used to record the polymerization shrinkage forces (MPa) for a period that started with the photo-activation and ended after two minutes of measurement. For each group, ten repetitions (n = 40) were performed. For DC% measurements, five specimens (n = 20) for each group were made in a metallic mold (2 mm thickness and 4 mm diameter, ISO 4049) and them pulverized, pressed with bromide potassium (KBr) and analyzed with FT-IR spectroscopy. The data of PS were analyzed by Analysis of Variance (ANOVA) with Welch's correction and Tamhane's test. The PS means (MPa) were: 0.60 (G1); 0.47 (G2); 0.52 (G3) and 0.45 (G4), showing significant differences between two photo-activation methods, regardless of the light source used. The continuous method provided the highest values for PS. The data of DC% were analyzed by Analysis of Variance (ANOVA) and shows significant differences for QTH LCUs, regardless of the photo-activation method used. The QTH provided the lowest values for DC%. The gradual method provides lower polymerization contraction, either with halogen lamp or LED. Degree of conversion (%) for continuous or gradual photo-activation method was influenced by the LCUs. Thus, the presented results suggest that gradual method photo-activation with LED LCU would suffice to ensure adequate degree of conversion and minimum polymerization shrinkage. | en |
dc.description.sponsorship | Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) | - |
dc.description.sponsorship | São Paulo State University, UNESP, Araraquara School of Dentistry, Brazil | - |
dc.format.extent | 2210-2218 | - |
dc.language.iso | eng | - |
dc.publisher | Maik Nauka/interperiodica/springer | - |
dc.source | Web of Science | - |
dc.title | Influence of different light sources and photo-activation methods on degree of conversion and polymerization shrinkage of a nanocomposite resin | en |
dc.type | outro | - |
dc.contributor.institution | Universidade Estadual Paulista (UNESP) | - |
dc.contributor.institution | Universidade de São Paulo (USP) | - |
dc.description.affiliation | Univ São Paulo State, UNESP, Araraquara Sch Dent, Dept Restorat Dent, Araraquara, SP, Brazil | - |
dc.description.affiliation | Univ São Paulo, Bauru Sch Dent, Bauru, SP, Brazil | - |
dc.description.affiliation | Univ São Paulo, São Carlos Phys Inst, São Carlos, SP, Brazil | - |
dc.description.affiliationUnesp | Univ São Paulo State, UNESP, Araraquara Sch Dent, Dept Restorat Dent, Araraquara, SP, Brazil | - |
dc.identifier.doi | 10.1134/S1054660X09230066 | - |
dc.identifier.wos | WOS:000272532300014 | - |
dc.rights.accessRights | Acesso restrito | - |
dc.relation.ispartof | Laser Physics | - |
Appears in Collections: | Artigos, TCCs, Teses e Dissertações da Unesp |
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