Abstract
The odontoblastic layer separates the dentin from the tissue by which it is formed the connective tissue of the pulp. The secondary dentin is not formed by stimulation of the odontoblasts but by damaging them, thus eliminating the separating barrier between the dentin and the tissue that forms it. In obliteration of the pulp canals (ageing, trauma, hereditary opalescent dentin) the odontoblasts disappear while the connective tissue functions. In external and internal resorption of the tooth, the affected parts of hard tissue deteriorate. They are removed by resorption and deposition starts after the damaged parts are removed.

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