Title
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Grain-boundary engineering for aging and slow-crack-growth resistant zirconia
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Author
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Abstract
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Ceramic materials are prone to slow crack growth, resulting in strength degradation over time. Although yttria-stabilized zirconia (Y-TZP) ceramics have higher crack resistance than other dental ceramics, their aging susceptibility threatens their long-term performance in aqueous environments such as the oral cavity. Unfortunately, increasing the aging resistance of Y-TZP ceramics normally reduces their crack resistance. Our recently conducted systematic study of doping 3Y-TZP with various trivalent cations revealed that lanthanum oxide (La2O3) and aluminum oxide (Al2O3) have the most potent effect to retard the aging kinetics of 3Y-TZP. In this study, the crack-propagation behavior of La2O3 and Al2O3 co-doped 3Y-TZP ceramics was investigated by double-torsion methods. The grain boundaries were examined using scanning transmission electron microscopy and energy-dispersive spectroscopy (STEM-EDS). Correlating these analytic data with hydrothermal aging studies using different doping systems, a strategy to strongly bind the segregated dopant cations with the oxygen vacancies at the zirconia-grain boundary was found to improve effectively the aging resistance of Y-TZP ceramics without affecting the resistance to crack propagation. |
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Language
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English
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Source (journal)
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Journal of dental research. - St. Louis, Mo.
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Publication
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St. Louis, Mo.
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2017
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ISSN
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0022-0345
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DOI
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10.1177/0022034517698661
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Volume/pages
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96
:7
(2017)
, p. 774-779
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ISI
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000403934500010
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Pubmed ID
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28571511
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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