Microhardness of resin cements in the intraradicular environment: Effects of water storage and softening treament

dc.creatorPEDREIRA, Ana Paula R. V.
dc.creatorPEGORARO, Luiz Fernando
dc.creatorGOES, Mario Fernando de
dc.creatorPEGORARO, Thiago Amadei
dc.creatorCARVALHO, Ricardo Marins
dc.date2009
dc.date2013-07-26T17:58:31Z
dc.date2016-06-30T20:30:57Z
dc.date2013-07-26T17:58:31Z
dc.date2016-06-30T20:30:57Z
dc.date.accessioned2018-03-29T01:53:27Z
dc.date.available2018-03-29T01:53:27Z
dc.identifierDENTAL MATERIALS, v.25, n.7, p.868-876, 2009
dc.identifier0109-5641
dc.identifier10.1016/j.dental.2009.01.096
dc.identifierhttp://dx.doi.org/10.1016/j.dental.2009.01.096
dc.identifierhttp://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&UT=000267395300007&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/773
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/773
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1308401
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionObjectives. To analyze the microhardness of four dual-cure resin cements used for cementing fiber-reinforced posts under the following conditions: after 7 days of storage in water, after additional 24 h of immersion in 75% ethanol, and after 3 months of storage in water. Hardness measurements were taken at the cervical, middle and apical thirds along the cement line. Methods. Root canals of 40 bovine incisors were prepared for post space. Fibrekor (R) glass fiber-reinforced posts (Jeneric/Pentron) of 1 mm in diameter were cemented using Panavia F 2.0 (Kuraray), Variolink (Ivoclar-Vivadent), Rely X Unicem (3M ESPE) or Duolink (Bisco) (N = 10). After 7 days of water storage at 37 degrees C, half the sample (N = 5) was longitudinally sectioned and the initial microhardness measured along the cement line from cervical to apex. These same samples were further immersed in 75% ethanol for 24 h and reassessed. The remaining half (N = 5) was kept unsectioned in deionized water at 37 degrees C for 3 months, followed by sectioning and measuring. Data were analyzed by a series of two-way ANOVA and Tukey tests at alpha = 5%. Results. Statistically significant differences were identified among the cements, thirds and conditions. Significant interactions were also observed between cements and thirds and between cements and conditions. Panavia F exhibited significantly higher initial microhardness than the other three cements, which showed no statistical difference among themselves. Variolink and Duolink showed significantly higher microhardness values in the cervical third, without significant difference among the thirds for the other cements. Immersion in ethanol significantly reduced the hardness values for all cements, regardless of the thirds. Storage in water for 3 months had no influence on the hardness of most of the cements, with the exception of Unicem that showed a significant increase in the hardness values after this period. Results showed heterogeneity in the microhardness of the cements inside the canal. All cements presented some degree of softening after ethanol treatment, which suggests instability of the polymer. The quality of curing of resin cements in the root canal environment seems unpredictable and highly material dependent. (C) 2009 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.
dc.description25
dc.description7
dc.description868
dc.description876
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.languageeng
dc.publisherELSEVIER SCI LTD
dc.publisherInglaterra
dc.relationDental Materials
dc.rightsfechado
dc.rightsCopyright ELSEVIER SCI LTD
dc.sourceWOS
dc.subjectDual-cure resin cements
dc.subjectFiber posts
dc.subjectMicrohardness
dc.subjectCROSS-LINK DENSITY
dc.subjectLIGHT-TRANSMITTING POSTS
dc.subjectDENTAL COMPOSITES
dc.subjectMECHANICAL-PROPERTIES
dc.subjectPOLYMER STRUCTURES
dc.subjectFILLER VOLUME
dc.subjectFIBER POSTS
dc.subjectCONVERSION
dc.subjectMODES
dc.subjectCURE
dc.subjectDentistry, Oral Surgery & Medicine
dc.subjectMaterials Science, Biomaterials
dc.titleMicrohardness of resin cements in the intraradicular environment: Effects of water storage and softening treament
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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