Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/46817
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dc.titleChemical degradation of composite restoratives
dc.contributor.authorYap, A.U.J.
dc.contributor.authorTan, S.H.L.
dc.contributor.authorWee, S.S.C.
dc.contributor.authorLee, C.W.
dc.contributor.authorLim, E.L.C.
dc.contributor.authorZeng, K.Y.
dc.date.accessioned2013-10-16T05:50:28Z
dc.date.available2013-10-16T05:50:28Z
dc.date.issued2001
dc.identifier.citationYap, A.U.J.,Tan, S.H.L.,Wee, S.S.C.,Lee, C.W.,Lim, E.L.C.,Zeng, K.Y. (2001). Chemical degradation of composite restoratives. Journal of Oral Rehabilitation 28 (11) : 1015-1021. ScholarBank@NUS Repository.
dc.identifier.issn0305182X
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/46817
dc.description.abstractThe chemical environment is one aspect of the oral environment, which could have an appreciable influence on the in vivo degradation of composite restoratives. The effects of chemical media on surface hardness of four composite restoratives (Silux [SX], Z100 [ZO], Ariston [AR] and Surefil [SF]) were investigated. The relationship between hardness and the thickness of the degradation layer was also studied. Thirty six specimens (3 x 4 x 2 mm) were made for each material. Following polymerization, the specimens were stored in artificial saliva at 37°C for 24 h. The specimens were then randomly divided into six groups of six, subjected to microhardness testing (load = 500 gf, dwell time = 15 s) and stored in the following chemicals for 1 week at 37°C: artificial saliva (S), distilled water (W), 0.02 N citric acid (C), 0.02 N lactic acid (L), heptane (H) and 75-25% ethanol-water solution (E). After conditioning, the specimens were again subjected to hardness testing and sectioned. Change in hardness (DH) was computed and the thickness of the degradation layer (DL) was measured using a computerized image analysis system at 600x magnification. Results of statistical analysis (ANOVA/Scheffe's [P < 0.05]) of DH based on materials were as follows: SX - E > all other mediums; ZO - W > C; and AR - S, W, E > H (> indicates significantly greater hardness change). No significant difference in DH was observed between the different chemicals for SF. The effects of chemical media on DH were found to be material dependent. A significant but weak positive correlation (Pearson's correlation [P < 0.05]) exists between change in hardness and thickness of the degradation layer. © 2001 Blackwell Science Ltd.
dc.sourceScopus
dc.subjectChemical
dc.subjectComposite
dc.subjectDegradation
dc.subjectEnvironment
dc.subjectHardness
dc.typeArticle
dc.contributor.departmentRESTORATIVE DENTISTRY
dc.description.sourcetitleJournal of Oral Rehabilitation
dc.description.volume28
dc.description.issue11
dc.description.page1015-1021
dc.description.codenJORHB
dc.identifier.isiutNOT_IN_WOS
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