Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jdent.2004.01.012
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dc.titleInfluence of curing modes on crosslink density in polymer structures
dc.contributor.authorSoh, M.S.
dc.contributor.authorYap, A.U.J.
dc.date.accessioned2013-10-16T05:52:31Z
dc.date.available2013-10-16T05:52:31Z
dc.date.issued2004
dc.identifier.citationSoh, M.S., Yap, A.U.J. (2004). Influence of curing modes on crosslink density in polymer structures. Journal of Dentistry 32 (4) : 321-326. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jdent.2004.01.012
dc.identifier.issn03005712
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/46893
dc.description.abstractObjective. This study investigates the influence of curing modes on the crosslinking density of dental composites. Methods. A light-cure unit (BISCO VIP) that allowed for independent command over time and intensity was selected. Four different light-curing modes with constant light energy density were investigated (control (C), pulse delay (PD), soft-start (SS) and pulse cure (PC)). The degree of crosslinking was assessed directly by measuring the glass transition temperature of 1 mm thick composite (Z100, 3M-ESPE) specimens using differential scanning calorimetry (DSC 2920). Polymer softening in ethanol was used as an indirect method for assessing the degree of crosslinking. After light-curing, specimens were stored in air at 37°C for 24 h and subjected to hardness testing using a digital microhardness tester (n=6, load=500 g; dwell time=15 s). The specimens were then placed in 75% ethanol-water solution at 37°C for 24 h and post-conditioning hardness was determined. Mean hardness (KHN)/hardness deterioration (ΔKHN) was computed and data was subjected to analysis using one-way ANOVA/Scheffe's test. Results. Ranking of degree of crosslinking density by DSC was as follows: C>PC>SS>PD. For the indirect method of determining crosslinking density, ΔKHN ranged from 10.8 to 12.9 and ranking was PC>SS>C>PD. Conclusions. Specimens polymerized with PD were significantly more susceptible to softening in ethanol than specimens cured with PC. Results of this study suggest that polymerization with PD resulted in a lower crosslink density and gave rise to polymers with an increased susceptibility to softening in ethanol. © 2004 Elsevier Ltd. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jdent.2004.01.012
dc.sourceScopus
dc.subjectComposite
dc.subjectCrosslink density
dc.subjectEthanol softening
dc.subjectGlass transition temperature
dc.subjectPulse delay cure
dc.typeArticle
dc.contributor.departmentRESTORATIVE DENTISTRY
dc.description.doi10.1016/j.jdent.2004.01.012
dc.description.sourcetitleJournal of Dentistry
dc.description.volume32
dc.description.issue4
dc.description.page321-326
dc.description.codenJDENA
dc.identifier.isiut000220935800010
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