Journal of Dental Research, Vol 72, 1279-1284, Copyright © 1993 by International & American Associations for Dental Research Online Journals

ARTICLES

Influence of carbonate on sintering of apatites

Y. Doi, T. Koda, N. Wakamatsu, T. Goto, H. Kamemizu, Y. Moriwaki, M. Adachi and Y. Suwa
Department of Dental Materials and Technology, School of Dentistry, Asahi University, Gifu, Japan.

Sintering of carbonate apatite, prepared at 100 degrees C and pH 9.0 for 3 days, was studied by thermal analysis, x-ray diffraction, and infrared spectroscopy. The sintering temperature, at which the linear thermal shrinkage of isostatically compacted specimens increased sharply, decreased in proportion to the amount of carbonate initially present in the apatite. For example, specimens with over 8 wt% carbonate could be sintered at a temperature (650 degrees C) which was nearly 400 degrees C lower than that needed for sintering a specimen with no carbonate. Amounts of carbonate lost at the end of sintering, estimated chemically and by infra-red spectroscopy, were approximately equal to sample weight losses estimated thermogravimetrically.

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