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Journal of Dental Research
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Strengthening of Feldspathic Porcelain by Ion Exchange and Tempering

K.J. Anusavice

Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610-0446

C. Shen

Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 32610-0446

R.B. Lee

Department of Dental Biomaterials, College of Dentistry, University of Florida, Gainesville, Florida 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.

Journal of Dental Research, Vol. 71, No. 5, 1134-1138 (1992)
DOI: 10.1177/00220345920710050101
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K.J. Anusavice, B. Hojjatie, and T.-C. Chang
Effect of Grinding and Fluoride-gel Exposure on Strength of Ion-exchanged Porcelain
Journal of Dental Research, August 1, 1994; 73(8): 1444 - 1449.
[Abstract] [PDF]