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Article: Tensile strength and ultrastructure of a compomer and a composite in aqueous and non-aqueous storage media.

TitleTensile strength and ultrastructure of a compomer and a composite in aqueous and non-aqueous storage media.
Authors
Issue Date2003
PublisherMosher & Linder, Inc. The Journal's web site is located at http://www.amjdent.com
Citation
American Journal Of Dentistry, 2003, v. 16 Spec No, p. 82A-87A How to Cite?
AbstractPURPOSE: To compare the ultimate tensile strength (UTS) of a compomer (Dyract AP) and a composite (Spectrum TPH) that were stored in an aqueous or a non-aqueous medium for up to 180 days. METHODS: 156 hourglass-shaped specimens of each material with cylindrical cross-sectional areas along the test regions were prepared. For each material, 12 beams were stressed to failure using a microtensile testing method to obtain the baseline UTS data. The rest were divided into two groups. One group was stored in de-ionized water (W), and the other (control) in silicone fluid (O) at 37 degrees C. 12 beams were removed from the respective storage medium after 1, 7, 14, 30, 90, 180 days for evaluation of the NTS. Materials retrieved from the intact central cylindrical portion of the fractured 180-day specimens were prepared for transmission electron microscopy (TEM). RESULTS: Baseline UTS for Dyract AP (D) and Spectrum TPH (S) were 76 +/- 16 MPa and 92 +/- 13 MPa, respectively. One-way ANOVA on ranks and Dunn's multiple comparison tests showed that UTS of Groups D-O, S-O and S-W remained stable during 180 days and were not significantly different from the baseline results. There was a significant drop in UTS in Group D-W after 90 and 180 days when compared with the 1-day result (P < 0.05). A highly significant nonlinear correlation was also observed in Group D-W between the mean UTS after the first day and the storage time (P < 0.01). No difference could be seen between the filler-matrix interface in S-O and S-W. A very thin glass-ionomer phase (ca. 200 nm thick siliceous hydrogel layer) could be observed in D-W, but not in D-O.
Persistent Identifierhttp://hdl.handle.net/10722/154301
ISSN
2015 Impact Factor: 1.194
2015 SCImago Journal Rankings: 0.443
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHuang, Cen_US
dc.contributor.authorTay, FRen_US
dc.contributor.authorWei, SHen_US
dc.contributor.authorKei, LHen_US
dc.contributor.authorCheung, GSen_US
dc.contributor.authorPashley, DHen_US
dc.date.accessioned2012-08-08T08:24:29Z-
dc.date.available2012-08-08T08:24:29Z-
dc.date.issued2003en_US
dc.identifier.citationAmerican Journal Of Dentistry, 2003, v. 16 Spec No, p. 82A-87Aen_US
dc.identifier.issn0894-8275en_US
dc.identifier.urihttp://hdl.handle.net/10722/154301-
dc.description.abstractPURPOSE: To compare the ultimate tensile strength (UTS) of a compomer (Dyract AP) and a composite (Spectrum TPH) that were stored in an aqueous or a non-aqueous medium for up to 180 days. METHODS: 156 hourglass-shaped specimens of each material with cylindrical cross-sectional areas along the test regions were prepared. For each material, 12 beams were stressed to failure using a microtensile testing method to obtain the baseline UTS data. The rest were divided into two groups. One group was stored in de-ionized water (W), and the other (control) in silicone fluid (O) at 37 degrees C. 12 beams were removed from the respective storage medium after 1, 7, 14, 30, 90, 180 days for evaluation of the NTS. Materials retrieved from the intact central cylindrical portion of the fractured 180-day specimens were prepared for transmission electron microscopy (TEM). RESULTS: Baseline UTS for Dyract AP (D) and Spectrum TPH (S) were 76 +/- 16 MPa and 92 +/- 13 MPa, respectively. One-way ANOVA on ranks and Dunn's multiple comparison tests showed that UTS of Groups D-O, S-O and S-W remained stable during 180 days and were not significantly different from the baseline results. There was a significant drop in UTS in Group D-W after 90 and 180 days when compared with the 1-day result (P < 0.05). A highly significant nonlinear correlation was also observed in Group D-W between the mean UTS after the first day and the storage time (P < 0.01). No difference could be seen between the filler-matrix interface in S-O and S-W. A very thin glass-ionomer phase (ca. 200 nm thick siliceous hydrogel layer) could be observed in D-W, but not in D-O.en_US
dc.languageengen_US
dc.publisherMosher & Linder, Inc. The Journal's web site is located at http://www.amjdent.comen_US
dc.relation.ispartofAmerican journal of dentistryen_US
dc.subject.meshAnalysis Of Varianceen_US
dc.subject.meshCompomers - Chemistryen_US
dc.subject.meshComposite Resins - Chemistryen_US
dc.subject.meshHumansen_US
dc.subject.meshMicroscopy, Electronen_US
dc.subject.meshNonlinear Dynamicsen_US
dc.subject.meshSiloxanes - Chemistryen_US
dc.subject.meshStress, Mechanicalen_US
dc.subject.meshSurface Propertiesen_US
dc.subject.meshTensile Strengthen_US
dc.subject.meshTime Factorsen_US
dc.subject.meshWater - Chemistryen_US
dc.titleTensile strength and ultrastructure of a compomer and a composite in aqueous and non-aqueous storage media.en_US
dc.typeArticleen_US
dc.identifier.emailCheung, GS:spcheung@hkucc.hku.hken_US
dc.identifier.authorityCheung, GS=rp00016en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.pmid14674506-
dc.identifier.scopuseid_2-s2.0-1542703822en_US
dc.identifier.hkuros85793-
dc.identifier.volume16 Spec Noen_US
dc.identifier.spage82Aen_US
dc.identifier.epage87Aen_US
dc.identifier.isiWOS:000186640200018-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridHuang, C=9747406100en_US
dc.identifier.scopusauthoridTay, FR=7102091962en_US
dc.identifier.scopusauthoridWei, SH=7401765260en_US
dc.identifier.scopusauthoridKei, LH=6602484458en_US
dc.identifier.scopusauthoridCheung, GS=7005809531en_US
dc.identifier.scopusauthoridPashley, DH=35448600800en_US

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