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dc.contributor.authorAlifui-Segbaya, Frank
dc.contributor.authorLewis, Jeffrey
dc.contributor.authorEggbeer, Dominic
dc.contributor.authorWilliams, Robert John
dc.date.accessioned2017-05-03T16:12:47Z
dc.date.available2017-05-03T16:12:47Z
dc.date.issued2015
dc.identifier.issn1355-2546
dc.identifier.doi10.1108/RPJ-11-2012-0110
dc.identifier.urihttp://hdl.handle.net/10072/69442
dc.description.abstractPurpose - The purpose of this research paper is to compare corrosion data obtained from additive-manufactured heat-treated (HRx) and non-heat-treated (NHRx) cobalt-chromium (Co-Cr) alloys. Heat treatments are indicated as necessary in complex intra-oral framework production by additive manufacturing to remove accumulated thermal stresses. However, heat treatments have been linked to corrosion in cast dental alloys. Currently, there are few publications on this subject for laser-sintered dental alloys required for academic review. Design/methodology/approach - Five rectangular specimens (n = 5), each with a total surface area of 10.27 cm2, were fabricated for the two groups. Specimens were immersed in an artificial saliva solution suspended by a nylon thread for 42 days at 37î Readings for Co, Cr and molybdenum ions released into the solution were obtained using an atomic absorption spectrometer at 1-, 4-, 7-, 14-, 21-, 28-, 35- and 42-day intervals at a detection limit of one part per million. Test methods are in accordance with ISO 10271. Findings - Results showed a higher ion release in the HRx sample, statistically significant at 99 per cent confidence level (p < 0.01). A two-way ANOVA test conducted showed that there was a main effect of day and a main effect of finish, and there was also a significant interaction between these factors. Originality/value - The study concludes that, although ion release in both samples was within the safe level recommended by ISO for the three major alloying elements, heat treatment, indeed, contributed extensively to the reduced corrosion resistance in the laser-sintered Co-Cr alloy. Further biocompatibility tests are recommended.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent268572 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherEmerald Group Publishing Limited
dc.publisher.placeUnited Kingdom
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom111
dc.relation.ispartofpageto116
dc.relation.ispartofissue1
dc.relation.ispartofjournalRapid Prototyping Journal
dc.relation.ispartofvolume21
dc.rights.retentionY
dc.subject.fieldofresearchBiomaterials
dc.subject.fieldofresearchMedical Devices
dc.subject.fieldofresearchAnalytical Spectrometry
dc.subject.fieldofresearchAnalytical Chemistry
dc.subject.fieldofresearchMetals and Alloy Materials
dc.subject.fieldofresearchDental Materials and Equipment
dc.subject.fieldofresearchMechanical Engineering
dc.subject.fieldofresearchcode090301
dc.subject.fieldofresearchcode090304
dc.subject.fieldofresearchcode030101
dc.subject.fieldofresearchcode0301
dc.subject.fieldofresearchcode091207
dc.subject.fieldofresearchcode110501
dc.subject.fieldofresearchcode0913
dc.titleIn vitro corrosion analyses of heat treated cobalt-chromium alloys manufactured by direct metal laser sintering
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Health, School of Dentistry and Oral Health
gro.rights.copyright© 2015 Emerald. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorAlifui-Segbaya, Frank


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