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Journal of Dental Research, Vol 71, 1134-1138, Copyright © 1992 by International & American Associations for Dental Research Online Journals

ARTICLES

Strengthening of feldspathic porcelain by ion exchange and tempering

K. J. Anusavice, C. Shen and R. B. Lee
Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville 32610-0446.

This study investigated the effectiveness of tempering and ion-exchange treatments on crack growth and bi-axial flexural strength of seven feldspathic porcelains. The results showed that tempering treatment was more effective in strengthening porcelain than was the ion-exchange process as measured by the bi-axial flexural strength. However, the results of initial crack size induced by a microhardness tester showed that ion-exchange yielded a surface that was more resistant to crack initiation than was that yielded by the tempering treatment. EDX and microprobe analyses showed that there was evidence of exchange between Na+ within the porcelain surface and K+ from the ion-exchange agent applied on the surface.




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