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Machinability of a newly developed pre-sintered zirconia block for dental crown applications

•Machinability of zirconia blocks is dependent on pre-sintering temperature.•High pre-sintering temperatures lead to high hardness of the zirconia blocks.•Pre-sintering at 1100 °C produces zirconia blocks with appropriate hardness.•Shrinkage percentage fell within the range of commercial zirconia. T...

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Bibliographic Details
Published in:Materials letters 2020-02, Vol.261, p.126996, Article 126996
Main Authors: Amat, Noor Faeizah, Muchtar, Andanastuti, Yew, Hsu Zenn, Amril, Muhammad Sufiyan, Muhamud, Rahimi L.
Format: Article
Language:English
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Summary:•Machinability of zirconia blocks is dependent on pre-sintering temperature.•High pre-sintering temperatures lead to high hardness of the zirconia blocks.•Pre-sintering at 1100 °C produces zirconia blocks with appropriate hardness.•Shrinkage percentage fell within the range of commercial zirconia. This study aimed to investigate the machinability of zirconia blocks pre-sintered at four different temperatures (900 °C, 1000 °C, 1100 °C, and 1200 °C). Vickers hardness and fracture toughness were measured to obtain the brittleness index (BI) of the zirconia blocks. The shrinkage percentage of the blocks pre-sintered at different temperatures was also determined upon final sintering at 1500 °C. The blocks were then subjected to machining, and the machined surfaces were morphologically analyzed. Although the materials pre-sintered at 900 °C and 1000 °C could be machined, noticeable trace lines and grooves formed on the machined surface due to lack of strength prior to sintering. BI and surface morphology confirmed that the new zirconia block can be milled at a pre-sintering temperature of 1100 °C and can achieve an acceptable shrinkage value for machining upon final sintering.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2019.126996