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A tissue closely resembling bone which covers the root of a tooth.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



the bony tissue that covers the root and neck of a tooth in mammals and humans. The cementum keeps the tooth firmly in its socket. Like other structures containing collagenous fibers, cementum is elaborated by special cells. The cells, known as cementoblasts, are buried deep in the cementum and are converted into cementocytes. Cementum contains 29.6 percent organic matter, 57 percent calcium phosphate, 8 percent calcium carbonate, 1.2 percent calcium fluoride, and 1 percent magnesium fluoride.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.