Taken from a geography term meaning the pass or depression between two mountains; in dentistry, it refers to the gingival depression between the teeth that connects the facial and lingual papillae. It follows the shape of the interproximal contact in healthy gingiva.
The nonkeratinized, depressed gingival tissue that lies between adjacent teeth; it extends labiolingually between the interdental papillae below the interproximal contact of the teeth.