Oral Anatomy MCQ 0005

The secretory product of odontoblasts is:

1. Topocollagen.
2. Calcium salts.
3. Mantle dentin.
4. Hydroxyapatite.

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The Correct option is C

Explanation with High Yield Facts :

DENTIN : It consists of about 80% hydroxyapatite (by dry weight) and 20% of organic matrix (collagen, proteoglycans, glycosaminoglycans) and is pervaded by the dentinal tubules. On the outside, the dentin is covered either by enamel (anatomical crown) or by cementum. On its inner surface facing the pulp chamber and the root canal, the dentin is lined by the odontoblasts, which are columnar cells arranged in a single layer.

• Each odontoblast sends a cytoplasmic process into one dentinal tubule, reaching as far as 1/2 the thickness of the dentin.
• Odontoblasts are not separated from the pulp by a basement membrane.
• A plexus of capillaries extends within the odontoblast layer close to the predentin (a thin uncalcified layer of dentin matrix facing the pulp chamber).
• The odontoblasts are of mesenchymal origin, synthesizing and secreting the components of the dentinal matrix. They secrete first a layer of predentin, which stains pale in H&E and PAS preparations.
• The odontoblasts furthermore secrete a phosphoprotein that is deposited specifically at the predentin-dentin junction. Apparently this phosphoprotein initiates the calcification of dentin.
• Dentin stains strongly with H&E and PAS

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