Crystallization of high-strength fine-sized leucite glass-ceramics

X. Chen, T. C. Chadwick, R. M. Wilson, R. Hill, M. J. Cattell

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    Manufacturing of leucite glass-ceramics often leads to materials with inhomogeneous microstructures. Crystal-glass thermal mismatches which produce microcracking around larger crystals-agglomerates are associated with reduced mechanical properties. The hypotheses were that fine (<1 μm) crystal size and uniform microstructure in a thermally matched glass would increase the biaxial flexural strength (BFS). Glass was synthesized, attritor-milled, and heat-treated. Glasses and glass-ceramics were characterized by XRD, SEM, and Dilatometry. Experimental (A, M1A and M2A) and commercial glass-ceramics were tested by the BFS test. Experimental glass-ceramics showed an increased leucite crystal number and decreased crystal size with glass particle size reduction. Leucite glass-ceramics (<1 μm) showed minimal matrix microcracking and BFS values of [mean (SD) MPa]: M1A = 253.8 (53.3); and M2A = 219.5 (54.1). Glass-ceramics M1A and M2A had higher mean BFS and characteristic strength than the IPS Empress Esthetic glass-ceramic (p <0.05). Fine-grained, translucent leucite glass-ceramics were synthesized and produced high mean BFS. © 2010 International & American Associations for Dental Research.
    Original languageEnglish
    Pages (from-to)1510-1516
    Number of pages6
    JournalJournal of Dental Research
    Issue number12
    Publication statusPublished - Dec 2010


    • crystallization
    • flexural strength
    • glass-ceramic
    • microstructure


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