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  • In vitro corrosion analyses of heat treated cobalt-chromium alloys manufactured by direct metal laser sintering

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    Author(s)
    Alifui-Segbaya, Frank
    Lewis, Jeffrey
    Eggbeer, Dominic
    Williams, Robert John
    Griffith University Author(s)
    Alifui-Segbaya, Frank
    Year published
    2015
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    Abstract
    Purpose - 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 ...
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    Purpose - 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.
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    Journal Title
    Rapid Prototyping Journal
    Volume
    21
    Issue
    1
    DOI
    https://doi.org/10.1108/RPJ-11-2012-0110
    Copyright Statement
    © 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.
    Subject
    Analytical chemistry
    Analytical spectrometry
    Biomaterials
    Medical devices
    Metals and alloy materials
    Mechanical engineering
    Dental materials and equipment
    Publication URI
    http://hdl.handle.net/10072/69442
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    • Journal articles

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