Article: Nano-scale structure and mechanical properties of the human dentine-enamel junction

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TitleNano-scale structure and mechanical properties of the human dentine-enamel junction
AuthorsChan, YL1
Ngan, AHW1
King, NM1
KeywordsBiomineralization
Dentine-enamel junction
Nanomechanical testing
Transmission electron microscope
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711005/description#description
CitationJournal Of The Mechanical Behavior Of Biomedical Materials, 2011, v. 4 n. 5, p. 785-795 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.jmbbm.2010.09.003
AbstractDespite being an interface between two mechanically mismatched phases of the soft dentine and hard enamel, the dentine-enamel junction (DEJ) in a human tooth is in general capable of withstanding a long working life of repeated dynamic loading. The current poor understanding of the structure and properties of the DEJ has presented a major obstacle to designing better therapeutic protocols for complications concerning the DEJ. In this investigation, it was discovered that the DEJ is a thin, but gradual interface with characteristics transiting from those of dentine to those of enamel. The collagen fibres in dentine enter into the enamel side of the DEJ and terminate in a region in which the hydroxyapatite crystals begin to show enamel characteristics. Using focused ion beam machining, micro-beams were fabricated from regions within 50 μm of the DEJ and were subjected to bend tests. In spite of the similarity in the flexural strength of the DEJ and enamel, fractographs revealed cracks in the DEJ that propagated along structures with dentine characteristics. To the best of our knowledge, this is the first report on the testing of the mechanical properties of the DEJ. © 2010 Elsevier Ltd.
ISSN1751-6161
2011 Impact Factor: 2.814
2011 SCImago Journal Rankings: 0.222
DOIhttp://dx.doi.org/10.1016/j.jmbbm.2010.09.003
ReferencesReferences in Scopus
DC Field
Value
dc.contributor.authorChan, YL
dc.contributor.authorNgan, AHW
dc.contributor.authorKing, NM
dc.date.accessioned2011-09-23T05:48:50Z
dc.date.available2011-09-23T05:48:50Z
dc.date.issued2011
dc.description.abstractDespite being an interface between two mechanically mismatched phases of the soft dentine and hard enamel, the dentine-enamel junction (DEJ) in a human tooth is in general capable of withstanding a long working life of repeated dynamic loading. The current poor understanding of the structure and properties of the DEJ has presented a major obstacle to designing better therapeutic protocols for complications concerning the DEJ. In this investigation, it was discovered that the DEJ is a thin, but gradual interface with characteristics transiting from those of dentine to those of enamel. The collagen fibres in dentine enter into the enamel side of the DEJ and terminate in a region in which the hydroxyapatite crystals begin to show enamel characteristics. Using focused ion beam machining, micro-beams were fabricated from regions within 50 μm of the DEJ and were subjected to bend tests. In spite of the similarity in the flexural strength of the DEJ and enamel, fractographs revealed cracks in the DEJ that propagated along structures with dentine characteristics. To the best of our knowledge, this is the first report on the testing of the mechanical properties of the DEJ. © 2010 Elsevier Ltd.
dc.description.natureLink_to_subscribed_fulltext
dc.identifier.citationJournal Of The Mechanical Behavior Of Biomedical Materials, 2011, v. 4 n. 5, p. 785-795 [How to Cite?]
DOI: http://dx.doi.org/10.1016/j.jmbbm.2010.09.003
dc.identifier.doihttp://dx.doi.org/10.1016/j.jmbbm.2010.09.003
dc.identifier.epage795
dc.identifier.hkuros192469
dc.identifier.isiWOS:000291914800015
dc.identifier.issn1751-6161
2011 Impact Factor: 2.814
2011 SCImago Journal Rankings: 0.222
dc.identifier.issue5
dc.identifier.pmid21565726
dc.identifier.scopuseid_2-s2.0-79955729028
dc.identifier.spage785
dc.identifier.urihttp://hdl.handle.net/10722/139361
dc.identifier.volume4
dc.languageeng
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/wps/find/journaldescription.cws_home/711005/description#description
dc.publisher.placeNetherlands
dc.relation.ispartofJournal of the Mechanical Behavior of Biomedical Materials
dc.relation.referencesReferences in Scopus
dc.subject.meshBiomechanics
dc.subject.meshDental Enamel - chemistry
dc.subject.meshDentin - chemistry
dc.subject.meshElastic Modulus
dc.subject.meshHardness
dc.subject.meshHumans
dc.subject.meshMaterials Testing
dc.subject.meshMechanical Processes
dc.subject.meshNanostructures - chemistry
dc.subjectBiomineralization
dc.subjectDentine-enamel junction
dc.subjectNanomechanical testing
dc.subjectTransmission electron microscope
dc.titleNano-scale structure and mechanical properties of the human dentine-enamel junction
dc.typeArticle
Author Affiliations
  1. The University of Hong Kong