The cementum (substantia ossea) is the third hard tissue of the tooth. Periodically secreted by specialized cells (cementoblasts) in the periodontal membrane, the cementum is a coarse material which binds and anchors the tooth to the periodontal ligament. The cementum is composed of about 50% organictissue, with the rest being water and inorganic (mostly calcium) salts. If the periodontal membrane is damaged, the cementum may be reabsorbed back into the membrane. Research Cementum
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Matt and Leela Probert
Abbreviations
Research Cementum
