Interfacial modulus mapping of layered dental ceramics using nanoindentation

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dc.contributor.authorTheocharopoulos, Antonios L.
dc.contributor.authorBushby, Andrew J.
dc.contributor.authorP'ng, Ken M. Y.
dc.contributor.authorWilson, Rory M.
dc.contributor.authorTanner, K. Elizabeth
dc.contributor.authorCattell, Michael J.
dc.contributor.funderState Scholarships Foundationen
dc.date.accessioned2017-01-20T15:21:54Z
dc.date.available2017-01-20T15:21:54Z
dc.date.issued2016-12-15
dc.date.updated2017-01-20T15:14:12Z
dc.description.abstractPURPOSE: The aim of this study was to test the modulus of elasticity (E) across the interfaces of yttria stabilized zirconia (YTZP) / veneer multilayers using nanoindentation. MATERIALS AND METHODS: YTZP core material (KaVo-Everest, Germany) specimens were either coated with a liner (IPS e.max ZirLiner, Ivoclar-Vivadent) (Type-1) or left as-sintered (Type-2) and subsequently veneered with a pressable glass-ceramic (IPS e.max ZirPress, Ivoclar-Vivadent). A 5 µm (nominal tip diameter) spherical indenter was used with a UMIS CSIRO 2000 (ASI, Canberra, Australia) nanoindenter system to test E across the exposed and polished interfaces of both specimen types. The multiple point load – partial unload method was used for E determination. All materials used were characterized using Scanning Electron Microscopy (SEM) and X – ray powder diffraction (XRD). E mappings of the areas tested were produced from the nanoindentation data. RESULTS: A significantly (P<.05) lower E value between Type-1 and Type-2 specimens at a distance of 40 µm in the veneer material was associated with the liner. XRD and SEM characterization of the zirconia sample showed a fine grained bulk tetragonal phase. IPS e-max ZirPress and IPS e-max ZirLiner materials were characterized as amorphous. CONCLUSION: The liner between the YTZP core and the heat pressed veneer may act as a weak link in this dental multilayer due to its significantly (P<.05) lower E. The present study has shown nanoindentation using spherical indentation and the multiple point load - partial unload method to be reliable predictors of E and useful evaluation tools for layered dental ceramic interfaces.en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationTheocharopoulos, A. L., Bushby, A. J., P'ng, K. M. Y., Wilson, R. M., Tanner, K. E. and Cattell, M. J. (2016) 'Interfacial modulus mapping of layered dental ceramics using nanoindentation', J Adv Prosthodont, 8(6), pp. 479-488. doi:10.4047/jap.2016.8.6.479en
dc.identifier.doi10.4047/jap.2016.8.6.479
dc.identifier.endpage488en
dc.identifier.issn2005-7806
dc.identifier.issued6en
dc.identifier.journaltitleJournal Of Advanced Prosthodonticsen
dc.identifier.startpage479en
dc.identifier.urihttps://hdl.handle.net/10468/3491
dc.identifier.volume8en
dc.language.isoenen
dc.publisherKorean Academy of Prosthodonticsen
dc.rights© 2016 The Korean Academy of Prosthodontics. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.en
dc.rights.urihttps://creativecommons.org/licenses/by-nc/3.0/en
dc.subjectElastic modulusen
dc.subjectFluorapatiteen
dc.subjectZirconiaen
dc.subject~Cork University Dental School and Hospital - Journal Articles~en
dc.titleInterfacial modulus mapping of layered dental ceramics using nanoindentationen
dc.typeArticle (peer-reviewed)en
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