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Journal of Dental Research, Vol 61, 1077-1082, Copyright © 1982 by International & American Associations for Dental Research Online Journals

ARTICLES

Effects of phase transformations of silicas and calcium sulfates on the compressive strength of gypsum-bonded investments at high temperatures

H. Ohno, S. Nakano, O. Miyakawa, K. Watanabe and N. Shiokawa

The effects of transformations of silicas and calcium sulfates on high temperature compressive strength were investigated in commercial and experimental investment materials containing fused quartz as silica. The strength is only slightly affected by the alpha leads to beta transformation of cristobalite and not by the quartz alpha leads to beta transformation. The state of the calcium sulfates is the main factor influencing variations in the strength at a particular temperature.




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