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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.
What is Dental Calculus? Dental Calculus (also known as dental tartar) is a yellowish or brown layer of mineral deposits on the teeth surface created by hardened dental plaque.alcium, phosphorus and other minerals from saliva are absorbed into dental plaque and harden its structure. This hardened structure is dental calculus. Its main ingredient is calcium phosphate, a hard insoluble material that adheres to the tooth enamel.