Journal of Materials Science

, Volume 42, Issue 6, pp 2064–2069 | Cite as

Fracture strength of ion-exchange silicate-containing dental glass ceramics



Dental glass ceramics with the composition of (0.2K, 0.8Na)2O–xAl2O3ySiO2 (x = 0.4–0.8, y = 4–6) were studied for their mechanical properties. Different ion-exchange practices were used to modify the sub-surface concentration distributions of K+, Na+, and H+ of these glass ceramics. Specimens were heat-treated in molten KNO3, and NaNO3 + KNO3 salt baths at 350–450 °C for the ion exchanges of K+ and Na+, or in the 4% acetic aqueous solution at 85 °C for a hydration treatment. Some glass ceramics contained a feldspar crystalline phase, which was not affected by different ion-exchange practices. Specimens with a single ion-exchange process or with the hydration treatment had higher flexural strength than those without either of these two treatments. For double ion-exchange specimens, the flexural strength increased with decreasing ion-exchange temperature. The double ion-exchange specimens had flexural strength up to 280 MPa, which was slightly lower than that of the single ion-exchange specimens, but much higher than that of the as-annealed specimens. However, the Weibull modulus of these double ion-exchange specimens was 5–8 because of the presence of large defects. For further increasing mechanical reliability, silicate-containing dental glass ceramics were required to have appropriate flaw controls and ion-exchange processes.


Residual Stress Flexural Strength Silicate Glass Compressive Residual Stress Glass Ceramic 
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The authors would like to thank National Science Counsel at Taiwan and I-Shou University for financial support, and Materials Research Laboratory at The Pennsylvania State University for research cooperation and assistance through a six-month research in USA.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Department of Materials Science and EngineeringI-Shou UniversityTai-Hsu HsiangTaiwan
  2. 2.Department of Materials Science and EngineeringThe Pennsylvania State UniversityUniversity ParkUSA

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