Lobe - Is one of the primary divisions of a crown; all teeth develop from four or five lobes. Lobes are usually separated by readily identifiable developmental grooves.
Cusp ridge - Each cusp has four cusp ridges radiating from its tip. They are named according to the direction they take away from the cusp tip (for example, mesial, distal, buccal, or lingual).
Ridge - Any linear elevation found on the surface of a tooth, named according to its location or form.
Lingual ridge - The ridge of enamel that extends from the cingulum to the cusp tip on the lingual surface of most cuspids.
Marginal ridge - A linear, rounded border of enamel that forms the mesial and distal margins of anterior teeth as viewed from the lingual, and the mesial and distal borders of occlusal surfaces on posterior teeth.