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Article: Failure behavior of glass ionomer cement under Hertzian indentation

TitleFailure behavior of glass ionomer cement under Hertzian indentation
Authors
KeywordsFailure behavior
Filler-reinforcement
Glass ionomer cement (GIC)
Hertzian indentation
Issue Date2008
PublisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dental
Citation
Dental Materials, 2008, v. 24 n. 9, p. 1223-1229 How to Cite?
AbstractObjective: To investigate the load-bearing capacity and failure mode of various types of glass ionomer cement (GIC) under Hertzian indentation, exploring the relationship between the failure behavior and formulation, and examining claims of filler-reinforcement of GIC. Methods: Discs 2 mm thick, 10 mm diameter, 8-18 replicates, were fabricated for two filler-reinforced GICs, four unmodified and unreinforced GICs, and four resin-modified GICs, with a dental silver amalgam and a filled-resin restorative material for comparison. Testing was at 23 °C, wet, after 7 d storage at 37 °C in artificial saliva at pH 6, using a 20 mm diameter hard steel ball and filled-nylon substrate (E: 10 GPa). First failure was detected acoustically; mode was determined visually. At least 1/3 of specimens in each case were examined under scanning electronic microscope for corroboration. Results: Reinforced and unmodified-unreinforced GICs were indistinguishable by failure load (one-way analysis of variance, P = 0.425, overall 260 ± 70 N) and mode. Failure loads for resin-modified GICs were 360-1150 N, amalgam ∼680 N, and filled resin ∼1200 N. Resin-modified GICs tended to be tougher (incomplete fracture), all others gave complete fracture (radial cracking). The stronger materials (two resin-modified GICs and filled resin) showed some cone cracking. Significance: While resin-modified GICs showed various extents of increase of failure load over that of the plain GICs, consistent with the hybrid chemistry, filler-reinforcement was not evident for the two claimed products, consistent with structural and theoretical expectations. © 2008 Academy of Dental Materials.
Persistent Identifierhttp://hdl.handle.net/10722/58148
ISSN
2015 Impact Factor: 3.931
2015 SCImago Journal Rankings: 1.339
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_HK
dc.contributor.authorDarvell, BWen_HK
dc.date.accessioned2010-05-31T03:24:36Z-
dc.date.available2010-05-31T03:24:36Z-
dc.date.issued2008en_HK
dc.identifier.citationDental Materials, 2008, v. 24 n. 9, p. 1223-1229en_HK
dc.identifier.issn0109-5641en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58148-
dc.description.abstractObjective: To investigate the load-bearing capacity and failure mode of various types of glass ionomer cement (GIC) under Hertzian indentation, exploring the relationship between the failure behavior and formulation, and examining claims of filler-reinforcement of GIC. Methods: Discs 2 mm thick, 10 mm diameter, 8-18 replicates, were fabricated for two filler-reinforced GICs, four unmodified and unreinforced GICs, and four resin-modified GICs, with a dental silver amalgam and a filled-resin restorative material for comparison. Testing was at 23 °C, wet, after 7 d storage at 37 °C in artificial saliva at pH 6, using a 20 mm diameter hard steel ball and filled-nylon substrate (E: 10 GPa). First failure was detected acoustically; mode was determined visually. At least 1/3 of specimens in each case were examined under scanning electronic microscope for corroboration. Results: Reinforced and unmodified-unreinforced GICs were indistinguishable by failure load (one-way analysis of variance, P = 0.425, overall 260 ± 70 N) and mode. Failure loads for resin-modified GICs were 360-1150 N, amalgam ∼680 N, and filled resin ∼1200 N. Resin-modified GICs tended to be tougher (incomplete fracture), all others gave complete fracture (radial cracking). The stronger materials (two resin-modified GICs and filled resin) showed some cone cracking. Significance: While resin-modified GICs showed various extents of increase of failure load over that of the plain GICs, consistent with the hybrid chemistry, filler-reinforcement was not evident for the two claimed products, consistent with structural and theoretical expectations. © 2008 Academy of Dental Materials.en_HK
dc.languageengen_HK
dc.publisherElsevier Inc. The Journal's web site is located at http://www.elsevier.com/locate/dentalen_HK
dc.relation.ispartofDental Materialsen_HK
dc.rightsDental Materials. Copyright © Elsevier Inc.en_HK
dc.subjectFailure behavioren_HK
dc.subjectFiller-reinforcementen_HK
dc.subjectGlass ionomer cement (GIC)en_HK
dc.subjectHertzian indentationen_HK
dc.titleFailure behavior of glass ionomer cement under Hertzian indentationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0109-5641&volume=24&spage=1223&epage=1229&date=2008&atitle=Failure+behavior+of+glass+ionomer+cement+under+Hertzian+indentationen_HK
dc.identifier.emailDarvell, BW: b.w.darvell@hku.hken_HK
dc.identifier.authorityDarvell, BW=rp00007en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.dental.2008.02.002en_HK
dc.identifier.pmid18359073-
dc.identifier.scopuseid_2-s2.0-47249112115en_HK
dc.identifier.hkuros150469en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-47249112115&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue9en_HK
dc.identifier.spage1223en_HK
dc.identifier.epage1229en_HK
dc.identifier.isiWOS:000258546000011-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridWang, Y=7601492022en_HK
dc.identifier.scopusauthoridDarvell, BW=7005953926en_HK

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