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Examining exposure reciprocity in a resin based composite using high irradiance levels and real-time degree of conversion values

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dc.title Examining exposure reciprocity in a resin based composite using high irradiance levels and real-time degree of conversion values en
dc.contributor.author Selig, Daniela
dc.contributor.author Haenel, Thomas
dc.contributor.author Hausnerová, Berenika
dc.contributor.author Moeginger, Bernhard
dc.contributor.author Labrie, Daniel
dc.contributor.author Sullivan, Braden
dc.contributor.author Price, Richard B. T.
dc.relation.ispartof Dental Materials
dc.identifier.issn 0109-5641 Scopus Sources, Sherpa/RoMEO, JCR
dc.date.issued 2015
utb.relation.volume 31
utb.relation.issue 5
dc.citation.spage 583
dc.citation.epage 593
dc.type article
dc.language.iso en
dc.publisher Elsevier
dc.identifier.doi 10.1016/j.dental.2015.02.010
dc.relation.uri https://www.sciencedirect.com/science/article/pii/S0109564115000597
dc.subject Degree of conversion en
dc.subject Dental curing light en
dc.subject Exposure reciprocity en
dc.subject Flowable composite en
dc.subject Irradiance en
dc.subject Mid FTIR en
dc.subject Polymerization kinetics en
dc.subject Radiant exposure en
dc.description.abstract Objective Exposure reciprocity suggests that, as long as the same radiant exposure is delivered, different combinations of irradiance and exposure time will achieve the same degree of resin polymerization. This study examined the validity of exposure reciprocity using real time degree of conversion results from one commercial flowable dental resin. Additionally a new fitting function to describe the polymerization kinetics is proposed. Methods A Plasma Arc Light Curing Unit (LCU) was used to deliver 0.75, 1.2, 1.5, 3.7 or 7.5 W/cm2 to 2 mm thick samples of Tetric EvoFlow (Ivoclar Vivadent). The irradiances and radiant exposures received by the resin were determined using an integrating sphere connected to a fiber-optic spectrometer. The degree of conversion (DC) was recorded at a rate of 8.5 measurements a second at the bottom of the resin using attenuated total reflectance Fourier Transform mid-infrared spectroscopy (FT-MIR). Five specimens were exposed at each irradiance level. The DC reached after 170 s and after 5, 10 and 15 J/cm2 had been delivered was compared using analysis of variance and Fisher's PLSD post hoc multiple comparison tests (alpha = 0.05). Results The same DC values were not reached after the same radiant exposures of 5, 10 and 15 J/cm2 had been delivered at an irradiance of 3.7 and 7.5 W/cm2. Thus exposure reciprocity was not supported for Tetric EvoFlow (p < 0.05). Significance For Tetric EvoFlow, there was no significant difference in the DC when 5, 10 and 15 J/cm2 were delivered at irradiance levels of 0.75, 1.2 and 1.5 W/cm2. The optimum combination of irradiance and exposure time for this commercial dental resin may be close to 1.5 W/cm2 for 12 s. © 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. en
utb.faculty University Institute
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1004258
utb.identifier.obdid 43873391
utb.identifier.scopus 2-s2.0-84927911991
utb.identifier.wok 000353068700013
utb.identifier.coden DEMAE
utb.source j-scopus
dc.date.accessioned 2015-05-22T08:01:37Z
dc.date.available 2015-05-22T08:01:37Z
utb.ou Centre of Polymer Systems
utb.contributor.internalauthor Haenel, Thomas
utb.contributor.internalauthor Hausnerová, Berenika
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