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Secondary (Cellular) Cementum
Dentin (A) lies on the left in this field. Note the striated appearance of the dentinal tubules and the abundance of interglobular dentin (B). A wide band of cementum (C) exhibits black spots which at higher magnification prove to be lacunae (D). Cementocytes arise from cementoblasts and become trapped within lacunae by the subsequent secretion of cementoid around themselves. Cementum that contains cementocytes is secondary, or cellular (E). It is deposited on a thin layer of primary (acellular) cementum (F). Primary cementum is frequently the only type of cementum found on the roots of incisors and canines (single-rooted teeth). Secondary cementum is found chiefly in the apical regions of the roots of premolars and molars (multi-rooted teeth).
Legend
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A - dentin |
D - lacunae |
