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dc.contributor.authorOberholzer, T.en_US
dc.contributor.authorPameijer, C.en_US
dc.contributor.authorGrobler, S.en_US
dc.contributor.authorRossouw, R.en_US
dc.date.accessioned2017-05-03T11:46:07Z
dc.date.available2017-05-03T11:46:07Z
dc.date.issued2003en_US
dc.date.modified2010-08-16T06:49:39Z
dc.identifier.issn03617734en_US
dc.identifier.urihttp://hdl.handle.net/10072/33493
dc.description.abstractThis study compares volumetric changes and rates of shrinkage during different stages of polymerization of dental resin composites and compomers exposed to the same total energy by using two different combinations of power density and exposure duration. A hybrid composite and its equivalent flowable and a compomer and its equivalent flowable were exposed using a halogen curing unit set at 400 mW/cm2 for 40 seconds and 800 mW/cm2 for 20 seconds: delivering 16 J/cm2 in both cases. Volumetric changes were recorded every 0.5 seconds using a mercury dilatometer. Ten replications per test condition were performed and the data were subjected to ANOVA. Statistically significant differences in shrinkage values and rates among different power densities were determined by means of paired t-tests at a 95% confidence level. Significantly more shrinkage (p<0.05) was found for the higher filled materials, Z250 and Dyract AP, when higher power density was used. However, no significant differences were found between their flowable counterparts when exposed to various power densities. Of the four materials, only Dyract AP exhibited no significant difference in shrinkage rate when various power densities were used. All the other materials exhibited significantly higher rates (p<0.05) at the higher power density.en_US
dc.description.peerreviewedYesen_US
dc.description.publicationstatusYesen_AU
dc.languageEnglishen_US
dc.language.isoen_AU
dc.publisherOperative Dentistryen_US
dc.publisher.placeUnited Statesen_US
dc.publisher.urihttp://www.jopdent.orgen_AU
dc.relation.ispartofpagefrom622en_US
dc.relation.ispartofpageto627en_US
dc.relation.ispartofissue5en_US
dc.relation.ispartofjournalOperative Dentistryen_US
dc.relation.ispartofvolume28en_US
dc.subject.fieldofresearchDentistry not elsewhere classifieden_US
dc.subject.fieldofresearchcode110599en_US
dc.titleEffect of power density on shrinkage of dental resin materialsen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Peer Reviewed (HERDC)en_US
dc.type.codeC - Journal Articlesen_US
gro.date.issued2003
gro.hasfulltextNo Full Text


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