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dental ledge. 1. a band of ectodermal cells growing from the epithelium of the embryonic jaws into the underlying mesenchyme; local buds from the ledge give rise to the primordia of the enamel organs of the teeth.
Tooth Sealants -. A dental sealant is a thin plastic coating (clear or white) that's bonded into the pits and grooves of a tooth. (Dentists formally refer to them as pit and fissure sealants.) They're most frequently placed on the chewing surface of teeth (where most of a tooth's grooves lie).