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dc.contributor.authorAlifui-Segbaya, Frank
dc.contributor.authorLewis, Jeff
dc.contributor.authorEggbeer, Dominic
dc.contributor.authorWilliams, Robert J.
dc.date.accessioned2016-03-23T12:35:44Z
dc.date.available2016-03-23T12:35:44Z
dc.date.issued2015
dc.identifier.citationAlifui-Segbaya, F., Lewis, J., Eggbeer, D. and Williams, R.J. (2015) 'In vitro corrosion analyses of heat treated cobalt-chromium alloys manufactured by direct metal laser sintering', Rapid Prototyping Journal, 21(1), pp.111-116.en_US
dc.identifier.issn1355-2546
dc.identifier.urihttp://hdl.handle.net/10369/7807
dc.identifier.urihttp://dx.doi.org/10.1108/RPJ-11-2012-0110
dc.descriptionThis article was published in Rapid Prototyping Journal in 2015, available at http://dx.doi.org/10.1108/RPJ-11-2012-0110en_US
dc.description.abstractThe 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 37°C. 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.en_US
dc.language.isoenen_US
dc.publisherEmerald Group Publishing Ltden_US
dc.relation.ispartofseriesRapid Prototyping Journal
dc.rightsNon-commercial
dc.subjectrapid manufacturingen_US
dc.subjectalloysen_US
dc.titleIn vitro corrosion analyses of heat treated cobalt-chromium alloys manufactured by direct metal laser sinteringen_US
dc.typeArticleen_US
dc.identifier.doihttp://dx.doi.org/10.1108/RPJ-11-2012-0110
dc.date.dateAccepted2015


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