''Denticulatio externa'' est denticulatio [[cylindrus|cylindrica]] aut conica dentatasdentes in superficie exteriore habens. ''Denticulatio interna'' dentatasdentes in superficie interiore habet. In denticulationibus obliquis (quo vide infra), ''interna'' angulum fastigium plurimum quam 90 gradus habentem significat. Denticulationes internae conversionem directionis non efficit.<ref name="ansiagma">{{cite book |title=ANSI/AGMA 1012-G05, Gear Nomenclature, Definition of Terms with Symbols |publisher=American Gear Manufacturers Association |isbn=1-55589-846-7}}.</ref>
