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Article: Hygroscopic expansion of a compomer and a composite on artificial gap reduction

TitleHygroscopic expansion of a compomer and a composite on artificial gap reduction
Authors
Issue Date2002
PublisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdent
Citation
Journal Of Dentistry, 2002, v. 30 n. 1, p. 11-19 How to Cite?
AbstractObjective: This study compared the effect of water sorption on the extent of marginal gap reduction in a compomer (Dyract AP, Dentsply) and a composite (Spectrum, Dentsply) over a 12-week storage period. Materials and methods: Artificial gaps were created in 40 borosilicate glass cylinders, each 5 mm deep and with an internal diameter of 5.5 mm. Half of the internal bonding surface of each cylinder was sandblasted, silanised and coated with a dentine adhesive (Primer&Bond NT, Dentsply). Twenty partially bonded cylinders were incrementally filled with Dyract AP (AP) and the rest with Spectrum (S). For each material, 10 specimens were stored in de-ionised water (W), and 10 (control) in non-aqueous silicone fluid (O) at 37°C. The dimension of the same maximum gap created in each specimen was repeatedly measured at 0, 1, 2, 4, 6, 8, 10 and 12 weeks, using a light microscope under incident light at 570x magnification. Gap widths in each of the four groups (n = 10) were statistically compared. Correlations between mean gap width reduction and storage time were also examined. Results: Friedman repeated measures ANOVA on ranks revealed significant differences (p < 0.001) among the gap widths measured at different time intervals in groups AP-W and S-W. No significant differences (p > 0.05) were found in groups AP-O and S-O. Tukey's multiple comparison test indicated that no significant differences (p > 0.05) were detectable beyond the sixth week in AP-W and the fourth week in S-W. Linear regression analyses showed that mean gap widths decreased exponentially with time for AP-W (r = 0.97) and S-W (r = 0.90). From the slopes of the regression lines, the rate of marginal gap reduction in AP-W was 4.6 times faster than S-W. Conclusion: Marginal gap reduction in both the materials are directly attributed to water sorption and that the reduction is larger and more rapid in Dyract AP. © 2002 Elsevier Science Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/154181
ISSN
2015 Impact Factor: 3.109
2015 SCImago Journal Rankings: 1.029
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorHuang, Cen_US
dc.contributor.authorTay, FRen_US
dc.contributor.authorCheung, GSPen_US
dc.contributor.authorKei, LHen_US
dc.contributor.authorWei, SHYen_US
dc.contributor.authorPashley, DHen_US
dc.date.accessioned2012-08-08T08:23:44Z-
dc.date.available2012-08-08T08:23:44Z-
dc.date.issued2002en_US
dc.identifier.citationJournal Of Dentistry, 2002, v. 30 n. 1, p. 11-19en_US
dc.identifier.issn0300-5712en_US
dc.identifier.urihttp://hdl.handle.net/10722/154181-
dc.description.abstractObjective: This study compared the effect of water sorption on the extent of marginal gap reduction in a compomer (Dyract AP, Dentsply) and a composite (Spectrum, Dentsply) over a 12-week storage period. Materials and methods: Artificial gaps were created in 40 borosilicate glass cylinders, each 5 mm deep and with an internal diameter of 5.5 mm. Half of the internal bonding surface of each cylinder was sandblasted, silanised and coated with a dentine adhesive (Primer&Bond NT, Dentsply). Twenty partially bonded cylinders were incrementally filled with Dyract AP (AP) and the rest with Spectrum (S). For each material, 10 specimens were stored in de-ionised water (W), and 10 (control) in non-aqueous silicone fluid (O) at 37°C. The dimension of the same maximum gap created in each specimen was repeatedly measured at 0, 1, 2, 4, 6, 8, 10 and 12 weeks, using a light microscope under incident light at 570x magnification. Gap widths in each of the four groups (n = 10) were statistically compared. Correlations between mean gap width reduction and storage time were also examined. Results: Friedman repeated measures ANOVA on ranks revealed significant differences (p < 0.001) among the gap widths measured at different time intervals in groups AP-W and S-W. No significant differences (p > 0.05) were found in groups AP-O and S-O. Tukey's multiple comparison test indicated that no significant differences (p > 0.05) were detectable beyond the sixth week in AP-W and the fourth week in S-W. Linear regression analyses showed that mean gap widths decreased exponentially with time for AP-W (r = 0.97) and S-W (r = 0.90). From the slopes of the regression lines, the rate of marginal gap reduction in AP-W was 4.6 times faster than S-W. Conclusion: Marginal gap reduction in both the materials are directly attributed to water sorption and that the reduction is larger and more rapid in Dyract AP. © 2002 Elsevier Science Ltd. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier Ltd. The Journal's web site is located at http://www.elsevier.com/locate/jdenten_US
dc.relation.ispartofJournal of Dentistryen_US
dc.subject.meshAbsorptionen_US
dc.subject.meshAnalysis Of Varianceen_US
dc.subject.meshCompomers - Chemistryen_US
dc.subject.meshComposite Resins - Chemistryen_US
dc.subject.meshDental Marginal Adaptationen_US
dc.subject.meshLinear Modelsen_US
dc.subject.meshMethacrylates - Chemistryen_US
dc.subject.meshPolymers - Chemistryen_US
dc.subject.meshSilicates - Chemistryen_US
dc.subject.meshStatistics, Nonparametricen_US
dc.subject.meshWater - Chemistryen_US
dc.titleHygroscopic expansion of a compomer and a composite on artificial gap reductionen_US
dc.typeArticleen_US
dc.identifier.emailCheung, GSP:spcheung@hkucc.hku.hken_US
dc.identifier.authorityCheung, GSP=rp00016en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0300-5712(01)00053-7en_US
dc.identifier.pmid11741730-
dc.identifier.scopuseid_2-s2.0-0036134021en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036134021&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume30en_US
dc.identifier.issue1en_US
dc.identifier.spage11en_US
dc.identifier.epage19en_US
dc.identifier.isiWOS:000173328200003-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridHuang, C=9747406100en_US
dc.identifier.scopusauthoridTay, FR=7102091962en_US
dc.identifier.scopusauthoridCheung, GSP=7005809531en_US
dc.identifier.scopusauthoridKei, LH=6602484458en_US
dc.identifier.scopusauthoridWei, SHY=7401765260en_US
dc.identifier.scopusauthoridPashley, DH=35448600800en_US

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