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Improvement of Strength Parameters of a Leucite-reinforced Glass Ceramic by Dual-ion Exchange

Department of Dental Prosthetics, Section of Dental Materials, University of Technology Aachen, Pauwelsstrasse 30, D-52074 Aachen, Germany, h.fischer{at}rwth-aachen.de

R. Marx

Department of Dental Prosthetics, Section of Dental Materials, University of Technology Aachen, Pauwelsstrasse 30, D-52074 Aachen, Germany

An innovative dual ion-exchange process can improve the limited strength and the scatter-in-strength of technical glasses. The objective of this study was to prove whether such a two-stage ion-exchange process can also improve the limited strength and the problematic scatter-in-strength of dental ceramic materials. The first exchange was done in KN03 on a leucite-reinforced glass-ceramic material, the second exchange in 70 mol% KN03, 30 mol% Na N03 at different treatment times and temperatures. The dual-exchange process approximately doubled the Weibull strength. Moreover, the Weibull modulus showed a four-fold increase, i.e., the coefficients of variation were reduced from 18.3 to 4.7%. We conclude that the dual-exchange process may help significantly to increase the clinical reliability of glass-ceramic dental restorations, because the strength and the scatter-in-strength will be substantially improved by this treatment.

Key Words: ceramics • reliability • dual ion-exchange • scatter in strength • residual stresses.

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Journal of Dental Research, Vol. 80, No. 1, 336-339 (2001)
DOI: 10.1177/00220345010800010701


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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Fischer, H. Articles by Marx, R. Search for Related Content PubMed PubMed Citation Articles by Fischer, H. Articles by Marx, R. Pubmed/NCBI databases Substance via MeSH Social Bookmarking                         What's this?