Dental germ. Morphological and biological characteristics of the tooth germ. Origin of teeth. Teeth have a dual origin: Ectodermal ; Mesodermal : Ectomesenchymal . EPITHELIUM-ECTOMESEMCHYME INTERACTION IN THE TOOTH DEVELOPMENT.
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Upper and lower
Sagittal section through the head of an embryo.
A. Primary epithelial bands; B. The same structure at higher magnification; C The change in plane of clevage.
The controlling signals (BMP-7)in place of the thickened epithelium
Theseproliferatingcellscontaintheentiregrowthpotential of theteeth .
Enamel knot - the expression of growth factors
Thezone of celldevisionisindicatedbythebrekenedareaintheinnerdentalepithelium, andthezonewherecellshavedifferentiatedbythewhitearea.
-Clusters of bloodvesselsarefoundramifyingaroundthetoothgerminthedentalfollicleadjasent to theouterdentalepithelium