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Effect of a broad-spectrum LED curing light on the Knoop microhardness of four posterior resin based composites at 2, 4 and 6-mm depths

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dc.title Effect of a broad-spectrum LED curing light on the Knoop microhardness of four posterior resin based composites at 2, 4 and 6-mm depths en
dc.contributor.author AlShaafi, Maan M.
dc.contributor.author Haenel, Thomas
dc.contributor.author Sullivan, Braden
dc.contributor.author Labrie, Daniel
dc.contributor.author Alqahtani, Mohammed Q.
dc.contributor.author Price, Richard B. T.
dc.relation.ispartof Journal of Dentistry
dc.identifier.issn 0300-5712 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2016
utb.relation.volume 45
dc.citation.spage 14
dc.citation.epage 18
dc.type article
dc.language.iso en
dc.publisher Elsevier Sci Ltd
dc.identifier.doi 10.1016/j.jdent.2015.11.004
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0300571215300695
dc.subject Bulk fill resin based composites en
dc.subject Broad spectrum LED curing light en
dc.subject Knoop microhardness en
dc.subject Depth of cure en
dc.description.abstract Objective: To measure the Knoop microhardness at the bottom of four posterior resin-based composites (RBCs): Tetric EvoCeram Bulk Fill (Ivoclar Vivadent), SureFil SDR flow (DENTSPLY), SonicFill (Kerr), and xtra fil (Voco). Methods: The RBCs were expressed into metal rings that were 2, 4, or 6-mm thick with a 4-mm internal diameter at 30 degrees C. The uncured specimens were covered by a Mylar strip and a Bluephase 20i (Ivoclar Vivadent) polywave (R) LED light-curing unit was used in high power setting for 20 s. The specimens were then removed and placed immediately on a Knoop microhardness-testing device and the microhardness was measured at 9 points across top and bottom surfaces of each specimen. Five specimens were made for each condition. Results: As expected, for each RBC there was no significant difference in the microhardness values at the top of the 2, 4 and 6-mm thick specimens. SureFil SDR Flow was the softest resin, but was the only resin that had no significant difference between the KHN values at the bottom of the 2 and 4-mm (Mixed Model ANOVA p < 0.05). Although the KHN of SureFil SDR Flow was only marginally significantly different between the 2 and 6-mm thickness, the bottom at 6-mm was only 59% of the hardness measured at the top. Clinical significance: This study highlights that clinicians need to consider how the depth of cure was evaluated when determining the depth of cure. SureFil SDR Flow was the softest material and, in accordance with manufacturer's instructions, this RBC should be overlaid with a conventional resin. (C) 2015 Elsevier Ltd. All rights reserved. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1006344
utb.identifier.obdid 43875135
utb.identifier.scopus 2-s2.0-84950114200
utb.identifier.wok 000370822800003
utb.identifier.pubmed 26593741
utb.identifier.coden JDENA
utb.source j-wok
dc.date.accessioned 2016-06-22T12:14:49Z
dc.date.available 2016-06-22T12:14:49Z
dc.description.sponsorship Dalhousie Dentistry Faculty Research Fund; Deanship of Scientific Research, King Saud University
utb.contributor.internalauthor Haenel, Thomas
utb.fulltext.affiliation Maan M. ALShaafi a, Thomas Haenel b,c,d, Braden Sullivan b, Daniel Labrie e, Mohammed Q. Alqahtani a, Richard B. Price b* a King Saud University, Restorative Dental Sciences, P.O. Box 60169, Riyadh 11545, Saudi Arabia b Dental Clinical Sciences, Dalhousie University, P.O. Box 15000, Halifax, NS B3H4R2, Canada c University of Bonn-Rhein-Sieg, Applied Sciences, Department of Natural Sciences, von-Liebig-Strasse 20, 53359 Rhinebach, Germany d Tomas Bata University in Zlín, Faculty of Technology, náměstí T. G. Masaryka 275, 76272 Zlín, Czech Republic e Department of Physics and Atmospheric Science, Dalhousie University, P.O. BOX 15000, Halifax, NS B3H 4R2, Canada * Corresponding author at: Department of Dental Clinical Sciences Faculty of Dentistry, Dalhousie University, 5981 University Ave., P.O. Box 15000, Halifax, NS B3H 4R, Canada. Fax: +1 902 494 1662. E-mail address: rbprice@Dal.ca (R.B. Price).
utb.fulltext.dates Received 11 September 2014 Received in revised form 16 November 2015 Accepted 18 November 2015
utb.fulltext.faculty Faculty of Technology
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