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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.
An abutment for a bridge uses two or more teeth to fill the toothless space. An abutment is a prepared tooth. ACRYLIC. This is a plastic widely used in dentistry for various purposes. Acrylic resin is used in making impression trays.